mirror of
https://github.com/mozilla/gecko-dev.git
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2719 lines
92 KiB
C++
2719 lines
92 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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* Mats Palmgren <mats.palmgren@bredband.net>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* rendering object to wrap rendering objects that should be scrollable */
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#include "nsCOMPtr.h"
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#include "nsHTMLParts.h"
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#include "nsPresContext.h"
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#include "nsIServiceManager.h"
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#include "nsIView.h"
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#include "nsIScrollableView.h"
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#include "nsIScrollable.h"
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#include "nsIViewManager.h"
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#include "nsHTMLContainerFrame.h"
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#include "nsGfxScrollFrame.h"
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#include "nsGkAtoms.h"
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#include "nsINameSpaceManager.h"
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#include "nsIDocument.h"
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#include "nsIFontMetrics.h"
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#include "nsIDocumentObserver.h"
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#include "nsIDocument.h"
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#include "nsBoxLayoutState.h"
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#include "nsINodeInfo.h"
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#include "nsIScrollbarFrame.h"
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#include "nsIScrollbarMediator.h"
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#include "nsITextControlFrame.h"
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#include "nsIDOMHTMLTextAreaElement.h"
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#include "nsNodeInfoManager.h"
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#include "nsIURI.h"
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#include "nsGUIEvent.h"
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#include "nsContentCreatorFunctions.h"
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#include "nsISupportsPrimitives.h"
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#include "nsAutoPtr.h"
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#include "nsPresState.h"
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#include "nsIGlobalHistory3.h"
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#include "nsDocShellCID.h"
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#include "nsIDOMHTMLDocument.h"
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#include "nsEventDispatcher.h"
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#include "nsContentUtils.h"
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#include "nsLayoutUtils.h"
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#ifdef ACCESSIBILITY
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#include "nsIAccessibilityService.h"
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#endif
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#include "nsDisplayList.h"
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#include "nsBidiUtils.h"
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//----------------------------------------------------------------------
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//----------nsHTMLScrollFrame-------------------------------------------
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nsIFrame*
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NS_NewHTMLScrollFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, PRBool aIsRoot)
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{
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return new (aPresShell) nsHTMLScrollFrame(aPresShell, aContext, aIsRoot);
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}
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nsHTMLScrollFrame::nsHTMLScrollFrame(nsIPresShell* aShell, nsStyleContext* aContext, PRBool aIsRoot)
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: nsHTMLContainerFrame(aContext),
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mInner(this, aIsRoot, PR_FALSE)
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{
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}
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/**
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* Get the view that we are scrolling within the scrolling view.
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* @result child view
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*/
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nsIFrame* nsHTMLScrollFrame::GetScrolledFrame() const
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{
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return mInner.GetScrolledFrame();
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}
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nsIScrollableView* nsHTMLScrollFrame::GetScrollableView()
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{
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return mInner.GetScrollableView();
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}
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nsPoint nsHTMLScrollFrame::GetScrollPosition() const
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{
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nsIScrollableView* s = mInner.GetScrollableView();
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nsPoint scrollPosition;
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s->GetScrollPosition(scrollPosition.x, scrollPosition.y);
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return scrollPosition;
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}
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void nsHTMLScrollFrame::ScrollTo(nsPoint aScrollPosition, PRUint32 aFlags)
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{
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nsIScrollableView* s = mInner.GetScrollableView();
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s->ScrollTo(aScrollPosition.x, aScrollPosition.y, aFlags);
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}
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nsGfxScrollFrameInner::ScrollbarStyles
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nsHTMLScrollFrame::GetScrollbarStyles() const {
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return mInner.GetScrollbarStylesFromFrame();
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}
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nsMargin nsHTMLScrollFrame::GetDesiredScrollbarSizes(nsBoxLayoutState* aState) {
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return mInner.GetDesiredScrollbarSizes(aState);
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}
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void nsHTMLScrollFrame::SetScrollbarVisibility(PRBool aVerticalVisible, PRBool aHorizontalVisible)
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{
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mInner.mNeverHasVerticalScrollbar = !aVerticalVisible;
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mInner.mNeverHasHorizontalScrollbar = !aHorizontalVisible;
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}
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nsIBox* nsHTMLScrollFrame::GetScrollbarBox(PRBool aVertical)
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{
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return aVertical ? mInner.mVScrollbarBox : mInner.mHScrollbarBox;
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}
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nsresult
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nsHTMLScrollFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
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{
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return mInner.CreateAnonymousContent(aElements);
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}
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void
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nsHTMLScrollFrame::Destroy()
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{
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mInner.Destroy();
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nsHTMLContainerFrame::Destroy();
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}
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NS_IMETHODIMP
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nsHTMLScrollFrame::
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SetInitialChildList(nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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nsresult rv = nsHTMLContainerFrame::SetInitialChildList(aListName, aChildList);
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mInner.CreateScrollableView();
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mInner.ReloadChildFrames();
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// listen for scroll events.
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mInner.GetScrollableView()->AddScrollPositionListener(&mInner);
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return rv;
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}
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NS_IMETHODIMP
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nsHTMLScrollFrame::AppendFrames(nsIAtom* aListName,
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nsIFrame* aFrameList)
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{
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NS_ASSERTION(!aListName, "Only main list supported");
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mFrames.AppendFrames(nsnull, aFrameList);
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mInner.ReloadChildFrames();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsHTMLScrollFrame::InsertFrames(nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList)
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{
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NS_ASSERTION(!aListName, "Only main list supported");
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NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
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"inserting after sibling frame with different parent");
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mFrames.InsertFrames(nsnull, aPrevFrame, aFrameList);
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mInner.ReloadChildFrames();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsHTMLScrollFrame::RemoveFrame(nsIAtom* aListName,
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nsIFrame* aOldFrame)
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{
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NS_ASSERTION(!aListName, "Only main list supported");
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mFrames.RemoveFrame(aOldFrame);
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mInner.ReloadChildFrames();
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return NS_OK;
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}
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nsSplittableType
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nsHTMLScrollFrame::GetSplittableType() const
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{
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return NS_FRAME_NOT_SPLITTABLE;
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}
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PRIntn
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nsHTMLScrollFrame::GetSkipSides() const
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{
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return 0;
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}
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nsIAtom*
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nsHTMLScrollFrame::GetType() const
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{
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return nsGkAtoms::scrollFrame;
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}
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/**
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HTML scrolling implementation
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We rely on the fact that if height is 'auto', changing the height of
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the element does not require reflowing the contents.
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All other things being equal, we prefer layouts with fewer scrollbars showing.
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*/
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struct ScrollReflowState {
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const nsHTMLReflowState& mReflowState;
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nsBoxLayoutState mBoxState;
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nsGfxScrollFrameInner::ScrollbarStyles mStyles;
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nsMargin mComputedBorder;
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// === Filled in when TryLayout succeeds ===
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// The area of the scrollport, in coordinates relative to the scrollframe
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nsRect mScrollPortRect;
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// The size of the inside-border area
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nsSize mInsideBorderSize;
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// Whether we decided to show the horizontal scrollbar
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PRPackedBool mShowHScrollbar;
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// Whether we decided to show the vertical scrollbar
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PRPackedBool mShowVScrollbar;
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ScrollReflowState(nsIScrollableFrame* aFrame,
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const nsHTMLReflowState& aState) :
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mReflowState(aState),
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mBoxState(aState.frame->PresContext(), aState.rendContext),
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mStyles(aFrame->GetScrollbarStyles()) {
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}
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};
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// XXXldb Can this go away?
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static nsSize ComputeInsideBorderSize(ScrollReflowState* aState,
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const nsSize& aDesiredInsideBorderSize)
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{
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// aDesiredInsideBorderSize is the frame size; i.e., it includes
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// borders and padding (but the scrolled child doesn't have
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// borders). The scrolled child has the same padding as us.
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nscoord contentWidth = aState->mReflowState.ComputedWidth();
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if (contentWidth == NS_UNCONSTRAINEDSIZE) {
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contentWidth = aDesiredInsideBorderSize.width -
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aState->mReflowState.mComputedPadding.LeftRight();
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}
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nscoord contentHeight = aState->mReflowState.ComputedHeight();
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if (contentHeight == NS_UNCONSTRAINEDSIZE) {
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contentHeight = aDesiredInsideBorderSize.height -
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aState->mReflowState.mComputedPadding.TopBottom();
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}
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aState->mReflowState.ApplyMinMaxConstraints(&contentWidth, &contentHeight);
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return nsSize(contentWidth + aState->mReflowState.mComputedPadding.LeftRight(),
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contentHeight + aState->mReflowState.mComputedPadding.TopBottom());
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}
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static void
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GetScrollbarMetrics(nsBoxLayoutState& aState, nsIBox* aBox, nsSize* aMin,
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nsSize* aPref, PRBool aVertical)
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{
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NS_ASSERTION(aState.GetRenderingContext(),
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"Must have rendering context in layout state for size "
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"computations");
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if (aMin) {
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*aMin = aBox->GetMinSize(aState);
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nsBox::AddMargin(aBox, *aMin);
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}
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if (aPref) {
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*aPref = aBox->GetPrefSize(aState);
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nsBox::AddMargin(aBox, *aPref);
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}
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}
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/**
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* Assuming that we know the metrics for our wrapped frame and
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* whether the horizontal and/or vertical scrollbars are present,
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* compute the resulting layout and return PR_TRUE if the layout is
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* consistent. If the layout is consistent then we fill in the
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* computed fields of the ScrollReflowState.
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*
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* The layout is consistent when both scrollbars are showing if and only
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* if they should be showing. A horizontal scrollbar should be showing if all
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* following conditions are met:
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* 1) the style is not HIDDEN
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* 2) our inside-border height is at least the scrollbar height (i.e., the
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* scrollbar fits vertically)
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* 3) our scrollport width (the inside-border width minus the width allocated for a
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* vertical scrollbar, if showing) is at least the scrollbar's min-width
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* (i.e., the scrollbar fits horizontally)
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* 4) the style is SCROLL, or the kid's overflow-area XMost is
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* greater than the scrollport width
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*
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* @param aForce if PR_TRUE, then we just assume the layout is consistent.
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*/
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PRBool
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nsHTMLScrollFrame::TryLayout(ScrollReflowState* aState,
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const nsHTMLReflowMetrics& aKidMetrics,
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PRBool aAssumeVScroll, PRBool aAssumeHScroll,
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PRBool aForce)
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{
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if ((aState->mStyles.mVertical == NS_STYLE_OVERFLOW_HIDDEN && aAssumeVScroll) ||
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(aState->mStyles.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN && aAssumeHScroll)) {
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NS_ASSERTION(!aForce, "Shouldn't be forcing a hidden scrollbar to show!");
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return PR_FALSE;
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}
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nsSize vScrollbarMinSize(0, 0);
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nsSize vScrollbarPrefSize(0, 0);
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if (mInner.mVScrollbarBox) {
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GetScrollbarMetrics(aState->mBoxState, mInner.mVScrollbarBox,
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&vScrollbarMinSize,
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aAssumeVScroll ? &vScrollbarPrefSize : nsnull, PR_TRUE);
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}
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nscoord vScrollbarDesiredWidth = aAssumeVScroll ? vScrollbarPrefSize.width : 0;
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nscoord vScrollbarDesiredHeight = aAssumeVScroll ? vScrollbarPrefSize.height : 0;
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nsSize hScrollbarMinSize(0, 0);
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nsSize hScrollbarPrefSize(0, 0);
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if (mInner.mHScrollbarBox) {
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GetScrollbarMetrics(aState->mBoxState, mInner.mHScrollbarBox,
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&hScrollbarMinSize,
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aAssumeHScroll ? &hScrollbarPrefSize : nsnull, PR_FALSE);
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}
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nscoord hScrollbarDesiredHeight = aAssumeHScroll ? hScrollbarPrefSize.height : 0;
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nscoord hScrollbarDesiredWidth = aAssumeHScroll ? hScrollbarPrefSize.width : 0;
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// First, compute our inside-border size and scrollport size
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// XXXldb Can we depend more on ComputeSize here?
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nsSize desiredInsideBorderSize;
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desiredInsideBorderSize.width = vScrollbarDesiredWidth +
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PR_MAX(aKidMetrics.width, hScrollbarDesiredWidth);
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desiredInsideBorderSize.height = hScrollbarDesiredHeight +
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PR_MAX(aKidMetrics.height, vScrollbarDesiredHeight);
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aState->mInsideBorderSize =
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ComputeInsideBorderSize(aState, desiredInsideBorderSize);
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nsSize scrollPortSize = nsSize(PR_MAX(0, aState->mInsideBorderSize.width - vScrollbarDesiredWidth),
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PR_MAX(0, aState->mInsideBorderSize.height - hScrollbarDesiredHeight));
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if (!aForce) {
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nsRect scrolledRect = mInner.GetScrolledRect(scrollPortSize);
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// If the style is HIDDEN then we already know that aAssumeHScroll is PR_FALSE
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if (aState->mStyles.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN) {
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PRBool wantHScrollbar =
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aState->mStyles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL ||
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scrolledRect.XMost() > scrollPortSize.width ||
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scrolledRect.x < 0;
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if (aState->mInsideBorderSize.height < hScrollbarMinSize.height ||
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scrollPortSize.width < hScrollbarMinSize.width)
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wantHScrollbar = PR_FALSE;
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if (wantHScrollbar != aAssumeHScroll)
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return PR_FALSE;
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}
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// If the style is HIDDEN then we already know that aAssumeVScroll is PR_FALSE
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if (aState->mStyles.mVertical != NS_STYLE_OVERFLOW_HIDDEN) {
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PRBool wantVScrollbar =
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aState->mStyles.mVertical == NS_STYLE_OVERFLOW_SCROLL ||
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scrolledRect.YMost() > scrollPortSize.height ||
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scrolledRect.y < 0;
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if (aState->mInsideBorderSize.width < vScrollbarMinSize.width ||
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scrollPortSize.height < vScrollbarMinSize.height)
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wantVScrollbar = PR_FALSE;
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if (wantVScrollbar != aAssumeVScroll)
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return PR_FALSE;
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}
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}
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nscoord vScrollbarActualWidth = aState->mInsideBorderSize.width - scrollPortSize.width;
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aState->mShowHScrollbar = aAssumeHScroll;
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aState->mShowVScrollbar = aAssumeVScroll;
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nsPoint scrollPortOrigin(aState->mComputedBorder.left,
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aState->mComputedBorder.top);
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if (!mInner.IsScrollbarOnRight()) {
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scrollPortOrigin.x += vScrollbarActualWidth;
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}
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aState->mScrollPortRect = nsRect(scrollPortOrigin, scrollPortSize);
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return PR_TRUE;
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}
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nsresult
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nsHTMLScrollFrame::ReflowScrolledFrame(const ScrollReflowState& aState,
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PRBool aAssumeHScroll,
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PRBool aAssumeVScroll,
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nsHTMLReflowMetrics* aMetrics,
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PRBool aFirstPass)
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{
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// these could be NS_UNCONSTRAINEDSIZE ... PR_MIN arithmetic should
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// be OK
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nscoord paddingLR = aState.mReflowState.mComputedPadding.LeftRight();
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nscoord availWidth = aState.mReflowState.ComputedWidth() + paddingLR;
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if (aAssumeVScroll) {
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nsSize vScrollbarPrefSize =
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mInner.mVScrollbarBox->GetPrefSize(const_cast<nsBoxLayoutState&>(aState.mBoxState));
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availWidth = PR_MAX(0, availWidth - vScrollbarPrefSize.width);
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}
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// We're forcing the padding on our scrolled frame, so let it know what that
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// padding is.
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mInner.mScrolledFrame->
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SetProperty(nsGkAtoms::usedPaddingProperty,
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new nsMargin(aState.mReflowState.mComputedPadding),
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nsCSSOffsetState::DestroyMarginFunc);
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nsPresContext* presContext = PresContext();
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// Pass PR_FALSE for aInit so we can pass in the correct padding
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nsHTMLReflowState kidReflowState(presContext, aState.mReflowState,
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mInner.mScrolledFrame,
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nsSize(availWidth, NS_UNCONSTRAINEDSIZE),
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-1, -1, PR_FALSE);
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kidReflowState.Init(presContext, -1, -1, nsnull,
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&aState.mReflowState.mComputedPadding);
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kidReflowState.mFlags.mAssumingHScrollbar = aAssumeHScroll;
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kidReflowState.mFlags.mAssumingVScrollbar = aAssumeVScroll;
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nsReflowStatus status;
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nsresult rv = ReflowChild(mInner.mScrolledFrame, presContext, *aMetrics,
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kidReflowState, 0, 0,
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NS_FRAME_NO_MOVE_FRAME | NS_FRAME_NO_MOVE_VIEW, status);
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// Don't resize or position the view because we're going to resize
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|
// it to the correct size anyway in PlaceScrollArea. Allowing it to
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// resize here would size it to the natural height of the frame,
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// which will usually be different from the scrollport height;
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// invalidating the difference will cause unnecessary repainting.
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FinishReflowChild(mInner.mScrolledFrame, presContext,
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&kidReflowState, *aMetrics, 0, 0,
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NS_FRAME_NO_MOVE_FRAME | NS_FRAME_NO_MOVE_VIEW | NS_FRAME_NO_SIZE_VIEW);
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// XXX Some frames (e.g., nsObjectFrame, nsFrameFrame, nsTextFrame) don't bother
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// setting their mOverflowArea. This is wrong because every frame should
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|
// always set mOverflowArea. In fact nsObjectFrame and nsFrameFrame don't
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|
// support the 'outline' property because of this. Rather than fix the world
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|
// right now, just fix up the overflow area if necessary. Note that we don't
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|
// check NS_FRAME_OUTSIDE_CHILDREN because it could be set even though the
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|
// overflow area doesn't include the frame bounds.
|
|
aMetrics->mOverflowArea.UnionRect(aMetrics->mOverflowArea,
|
|
nsRect(0, 0, aMetrics->width, aMetrics->height));
|
|
|
|
return rv;
|
|
}
|
|
|
|
PRBool
|
|
nsHTMLScrollFrame::GuessVScrollbarNeeded(const ScrollReflowState& aState)
|
|
{
|
|
if (aState.mStyles.mVertical != NS_STYLE_OVERFLOW_AUTO)
|
|
// no guessing required
|
|
return aState.mStyles.mVertical == NS_STYLE_OVERFLOW_SCROLL;
|
|
|
|
// If we've had at least one non-initial reflow, then just assume
|
|
// the state of the vertical scrollbar will be what we determined
|
|
// last time.
|
|
if (mInner.mHadNonInitialReflow) {
|
|
return mInner.mHasVerticalScrollbar;
|
|
}
|
|
|
|
// If this is the initial reflow, guess PR_FALSE because usually
|
|
// we have very little content by then.
|
|
if (InInitialReflow())
|
|
return PR_FALSE;
|
|
|
|
if (mInner.mIsRoot) {
|
|
// For viewports, try getting a hint from global history
|
|
// as to whether we had a vertical scrollbar last time.
|
|
PRBool hint;
|
|
nsresult rv = mInner.GetVScrollbarHintFromGlobalHistory(&hint);
|
|
if (NS_SUCCEEDED(rv))
|
|
return hint;
|
|
// No hint. Assume that there will be a scrollbar; it seems to me
|
|
// that 'most pages' do have a scrollbar, and anyway, it's cheaper
|
|
// to do an extra reflow for the pages that *don't* need a
|
|
// scrollbar (because on average they will have less content).
|
|
return PR_TRUE;
|
|
}
|
|
|
|
// For non-viewports, just guess that we don't need a scrollbar.
|
|
// XXX I wonder if statistically this is the right idea; I'm
|
|
// basically guessing that there are a lot of overflow:auto DIVs
|
|
// that get their intrinsic size and don't overflow
|
|
return PR_FALSE;
|
|
}
|
|
|
|
PRBool
|
|
nsHTMLScrollFrame::InInitialReflow() const
|
|
{
|
|
// We're in an initial reflow if NS_FRAME_FIRST_REFLOW is set, unless we're a
|
|
// root scrollframe. In that case we want to skip this clause altogether.
|
|
// The guess here is that there are lots of overflow:auto divs out there that
|
|
// end up auto-sizing so they don't overflow, and that the root basically
|
|
// always needs a scrollbar if it did last time we loaded this page (good
|
|
// assumption, because our initial reflow is no longer synchronous).
|
|
return !mInner.mIsRoot && (GetStateBits() & NS_FRAME_FIRST_REFLOW);
|
|
}
|
|
|
|
nsresult
|
|
nsHTMLScrollFrame::ReflowContents(ScrollReflowState* aState,
|
|
const nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
PRBool currentlyUsingVScrollbar = GuessVScrollbarNeeded(*aState);
|
|
nsHTMLReflowMetrics kidDesiredSize(aDesiredSize.mFlags);
|
|
nsresult rv = ReflowScrolledFrame(*aState, PR_FALSE, currentlyUsingVScrollbar,
|
|
&kidDesiredSize, PR_TRUE);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
PRBool didUseScrollbar = currentlyUsingVScrollbar;
|
|
|
|
// There's an important special case ... if the child appears to fit
|
|
// in the inside-border rect (but overflows the scrollport), we
|
|
// should try laying it out without a vertical scrollbar. It will
|
|
// usually fit because making the available-width wider will not
|
|
// normally make the child taller. (The only situation I can think
|
|
// of is when you have a line containing %-width inline replaced
|
|
// elements whose percentages sum to more than 100%, so increasing
|
|
// the available width makes the line break where it was fitting
|
|
// before.) If we don't treat this case specially, then we will
|
|
// decide that showing scrollbars is OK because the content
|
|
// overflows when we're showing scrollbars and we won't try to
|
|
// remove the vertical scrollbar.
|
|
|
|
// Detecting when we enter this special case is important for when
|
|
// people design layouts that exactly fit the container "most of the
|
|
// time".
|
|
if (currentlyUsingVScrollbar &&
|
|
aState->mStyles.mVertical != NS_STYLE_OVERFLOW_SCROLL &&
|
|
aState->mStyles.mHorizontal != NS_STYLE_OVERFLOW_SCROLL) {
|
|
nsSize insideBorderSize =
|
|
ComputeInsideBorderSize(aState,
|
|
nsSize(kidDesiredSize.width, kidDesiredSize.height));
|
|
nsRect scrolledRect = mInner.GetScrolledRect(insideBorderSize);
|
|
if (nsRect(nsPoint(0, 0), insideBorderSize).Contains(scrolledRect)) {
|
|
// Let's pretend we had no vertical scrollbar coming in here
|
|
currentlyUsingVScrollbar = PR_FALSE;
|
|
rv = ReflowScrolledFrame(*aState, PR_FALSE, currentlyUsingVScrollbar,
|
|
&kidDesiredSize, PR_FALSE);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
didUseScrollbar = PR_FALSE;
|
|
}
|
|
}
|
|
|
|
// First try a layout without a horizontal scrollbar, then with.
|
|
if (TryLayout(aState, kidDesiredSize, didUseScrollbar, PR_FALSE, PR_FALSE))
|
|
return NS_OK;
|
|
// XXX Adding a horizontal scrollbar could cause absolute children positioned
|
|
// relative to the bottom padding-edge to need to be reflowed. But we don't,
|
|
// because that would be slow.
|
|
if (TryLayout(aState, kidDesiredSize, didUseScrollbar, PR_TRUE, PR_FALSE))
|
|
return NS_OK;
|
|
|
|
PRBool canHaveVerticalScrollbar =
|
|
aState->mStyles.mVertical != NS_STYLE_OVERFLOW_HIDDEN;
|
|
// That didn't work. Try the other setting for the vertical scrollbar.
|
|
// But don't try to show a scrollbar if we know there can't be one.
|
|
if (currentlyUsingVScrollbar || canHaveVerticalScrollbar) {
|
|
nsHTMLReflowMetrics kidRetrySize(aDesiredSize.mFlags);
|
|
rv = ReflowScrolledFrame(*aState, PR_FALSE, !currentlyUsingVScrollbar,
|
|
&kidRetrySize, PR_FALSE);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
didUseScrollbar = !currentlyUsingVScrollbar;
|
|
// XXX Adding a horizontal scrollbar could cause absolute children positioned
|
|
// relative to the bottom padding-edge to need to be reflowed. But we don't,
|
|
// because that would be slow.
|
|
if (TryLayout(aState, kidRetrySize, didUseScrollbar, PR_FALSE, PR_FALSE))
|
|
return NS_OK;
|
|
if (TryLayout(aState, kidRetrySize, didUseScrollbar, PR_TRUE, PR_FALSE))
|
|
return NS_OK;
|
|
|
|
NS_WARNING("Strange content ... we can't find logically consistent scrollbar settings");
|
|
} else {
|
|
NS_WARNING("Strange content ... we can't find logically consistent scrollbar settings");
|
|
}
|
|
|
|
// Fall back to no scrollbars --- even if NS_STYLE_OVERFLOW_SCROLL is
|
|
// in effect. They might not fit anyway.
|
|
if (didUseScrollbar) {
|
|
rv = ReflowScrolledFrame(*aState, PR_FALSE, PR_FALSE, &kidDesiredSize, PR_FALSE);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
}
|
|
TryLayout(aState, kidDesiredSize, PR_FALSE, PR_FALSE, PR_TRUE);
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsHTMLScrollFrame::PlaceScrollArea(const ScrollReflowState& aState)
|
|
{
|
|
nsIView* scrollView = mInner.mScrollableView->View();
|
|
nsIViewManager* vm = scrollView->GetViewManager();
|
|
vm->MoveViewTo(scrollView, aState.mScrollPortRect.x, aState.mScrollPortRect.y);
|
|
vm->ResizeView(scrollView, nsRect(nsPoint(0, 0), aState.mScrollPortRect.Size()),
|
|
PR_TRUE);
|
|
|
|
nsIFrame *scrolledFrame = mInner.mScrolledFrame;
|
|
nsIView *scrolledView = scrolledFrame->GetView();
|
|
// Set the x,y of the scrolled frame to the correct value: the displacement
|
|
// from its origin to the origin of this frame
|
|
scrolledFrame->SetPosition(scrolledView->GetOffsetTo(GetView()));
|
|
|
|
nsRect scrolledArea;
|
|
scrolledArea.UnionRect(mInner.GetScrolledRect(aState.mScrollPortRect.Size()),
|
|
nsRect(nsPoint(0,0), aState.mScrollPortRect.Size()));
|
|
|
|
// Store the new overflow area. Note that this changes where an outline
|
|
// of the scrolled frame would be painted, but scrolled frames can't have
|
|
// outlines (the outline would go on this scrollframe instead).
|
|
// Using FinishAndStoreOverflow is needed so NS_FRAME_OUTSIDE_CHILDREN
|
|
// gets set correctly. It also messes with the overflow rect in the
|
|
// -moz-hidden-unscrollable case, but scrolled frames can't have
|
|
// 'overflow' either.
|
|
// This needs to happen before SyncFrameViewAfterReflow so
|
|
// NS_FRAME_OUTSIDE_CHILDREN is set.
|
|
scrolledFrame->FinishAndStoreOverflow(&scrolledArea,
|
|
scrolledFrame->GetSize());
|
|
|
|
// Note that making the view *exactly* the size of the scrolled area
|
|
// is critical, since the view scrolling code uses the size of the
|
|
// scrolled view to clamp scroll requests.
|
|
nsContainerFrame::SyncFrameViewAfterReflow(scrolledFrame->PresContext(),
|
|
scrolledFrame,
|
|
scrolledView,
|
|
&scrolledArea,
|
|
NS_FRAME_NO_MOVE_VIEW);
|
|
}
|
|
|
|
/* virtual */ nscoord
|
|
nsHTMLScrollFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
|
|
{
|
|
nscoord result = 0;
|
|
DISPLAY_MIN_WIDTH(this, result);
|
|
return result;
|
|
}
|
|
|
|
/* virtual */ nscoord
|
|
nsHTMLScrollFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
|
|
{
|
|
nscoord result;
|
|
DISPLAY_PREF_WIDTH(this, result);
|
|
result = mInner.mScrolledFrame->GetPrefWidth(aRenderingContext);
|
|
|
|
nsGfxScrollFrameInner::ScrollbarStyles ss = GetScrollbarStyles();
|
|
if (ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN && // ideal?
|
|
mInner.mVScrollbarBox) {
|
|
nsBoxLayoutState bls(PresContext(), aRenderingContext);
|
|
nsSize vScrollbarPrefSize(0, 0);
|
|
GetScrollbarMetrics(bls, mInner.mVScrollbarBox,
|
|
nsnull, &vScrollbarPrefSize, PR_TRUE);
|
|
result = NSCoordSaturatingAdd(result, vScrollbarPrefSize.width);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsHTMLScrollFrame::GetPadding(nsMargin& aMargin)
|
|
{
|
|
// Our padding hangs out on the inside of the scrollframe, but XUL doesn't
|
|
// reaize that. If we're stuck inside a XUL box, we need to claim no
|
|
// padding.
|
|
// @see also nsXULScrollFrame::GetPadding.
|
|
aMargin.SizeTo(0,0,0,0);
|
|
return NS_OK;
|
|
}
|
|
|
|
PRBool
|
|
nsHTMLScrollFrame::IsCollapsed(nsBoxLayoutState& aBoxLayoutState)
|
|
{
|
|
// We're never collapsed in the box sense.
|
|
return PR_FALSE;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsHTMLScrollFrame::Reflow(nsPresContext* aPresContext,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
DO_GLOBAL_REFLOW_COUNT("nsHTMLScrollFrame");
|
|
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
|
|
|
|
ScrollReflowState state(this, aReflowState);
|
|
// sanity check: ensure that if we have no scrollbar, we treat it
|
|
// as hidden.
|
|
if (!mInner.mVScrollbarBox || mInner.mNeverHasVerticalScrollbar)
|
|
state.mStyles.mVertical = NS_STYLE_OVERFLOW_HIDDEN;
|
|
if (!mInner.mHScrollbarBox || mInner.mNeverHasHorizontalScrollbar)
|
|
state.mStyles.mHorizontal = NS_STYLE_OVERFLOW_HIDDEN;
|
|
|
|
//------------ Handle Incremental Reflow -----------------
|
|
PRBool reflowContents = PR_TRUE; // XXX Ignored
|
|
PRBool reflowHScrollbar = PR_TRUE;
|
|
PRBool reflowVScrollbar = PR_TRUE;
|
|
PRBool reflowScrollCorner = PR_TRUE;
|
|
if (!aReflowState.ShouldReflowAllKids()) {
|
|
#define NEEDS_REFLOW(frame_) \
|
|
((frame_) && NS_SUBTREE_DIRTY(frame_))
|
|
|
|
reflowContents = NEEDS_REFLOW(mInner.mScrolledFrame);
|
|
reflowHScrollbar = NEEDS_REFLOW(mInner.mHScrollbarBox);
|
|
reflowVScrollbar = NEEDS_REFLOW(mInner.mVScrollbarBox);
|
|
reflowScrollCorner = NEEDS_REFLOW(mInner.mScrollCornerBox);
|
|
|
|
#undef NEEDS_REFLOW
|
|
}
|
|
|
|
nsRect oldScrollAreaBounds = mInner.mScrollableView->View()->GetBounds();
|
|
nsRect oldScrolledAreaBounds = mInner.mScrolledFrame->GetView()->GetBounds();
|
|
state.mComputedBorder = aReflowState.mComputedBorderPadding -
|
|
aReflowState.mComputedPadding;
|
|
|
|
nsresult rv = ReflowContents(&state, aDesiredSize);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
PlaceScrollArea(state);
|
|
mInner.ScrollToRestoredPosition();
|
|
|
|
PRBool didHaveHScrollbar = mInner.mHasHorizontalScrollbar;
|
|
PRBool didHaveVScrollbar = mInner.mHasVerticalScrollbar;
|
|
mInner.mHasHorizontalScrollbar = state.mShowHScrollbar;
|
|
mInner.mHasVerticalScrollbar = state.mShowVScrollbar;
|
|
nsRect newScrollAreaBounds = mInner.mScrollableView->View()->GetBounds();
|
|
nsRect newScrolledAreaBounds = mInner.mScrolledFrame->GetView()->GetBounds();
|
|
if (mInner.mSkippedScrollbarLayout ||
|
|
reflowHScrollbar || reflowVScrollbar || reflowScrollCorner ||
|
|
(GetStateBits() & NS_FRAME_IS_DIRTY) ||
|
|
didHaveHScrollbar != state.mShowHScrollbar ||
|
|
didHaveVScrollbar != state.mShowVScrollbar ||
|
|
oldScrollAreaBounds != newScrollAreaBounds ||
|
|
oldScrolledAreaBounds != newScrolledAreaBounds) {
|
|
if (!mInner.mSupppressScrollbarUpdate) {
|
|
mInner.mSkippedScrollbarLayout = PR_FALSE;
|
|
mInner.SetScrollbarVisibility(mInner.mHScrollbarBox, state.mShowHScrollbar);
|
|
mInner.SetScrollbarVisibility(mInner.mVScrollbarBox, state.mShowVScrollbar);
|
|
// place and reflow scrollbars
|
|
nsRect insideBorderArea =
|
|
nsRect(nsPoint(state.mComputedBorder.left, state.mComputedBorder.top),
|
|
state.mInsideBorderSize);
|
|
mInner.LayoutScrollbars(state.mBoxState, insideBorderArea,
|
|
oldScrollAreaBounds, state.mScrollPortRect);
|
|
} else {
|
|
mInner.mSkippedScrollbarLayout = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
aDesiredSize.width = state.mInsideBorderSize.width +
|
|
state.mComputedBorder.LeftRight();
|
|
aDesiredSize.height = state.mInsideBorderSize.height +
|
|
state.mComputedBorder.TopBottom();
|
|
|
|
aDesiredSize.mOverflowArea = nsRect(0, 0, aDesiredSize.width, aDesiredSize.height);
|
|
FinishAndStoreOverflow(&aDesiredSize);
|
|
|
|
if (!InInitialReflow() && !mInner.mHadNonInitialReflow) {
|
|
mInner.mHadNonInitialReflow = PR_TRUE;
|
|
if (mInner.mIsRoot) {
|
|
// For viewports, record whether we needed a vertical scrollbar
|
|
// after the first non-initial reflow.
|
|
mInner.SaveVScrollbarStateToGlobalHistory();
|
|
}
|
|
}
|
|
|
|
aStatus = NS_FRAME_COMPLETE;
|
|
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
|
|
mInner.PostOverflowEvent();
|
|
return rv;
|
|
}
|
|
|
|
NS_IMETHODIMP_(nsrefcnt)
|
|
nsHTMLScrollFrame::AddRef(void)
|
|
{
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP_(nsrefcnt)
|
|
nsHTMLScrollFrame::Release(void)
|
|
{
|
|
return NS_OK;
|
|
}
|
|
|
|
#ifdef NS_DEBUG
|
|
NS_IMETHODIMP
|
|
nsHTMLScrollFrame::GetFrameName(nsAString& aResult) const
|
|
{
|
|
return MakeFrameName(NS_LITERAL_STRING("HTMLScroll"), aResult);
|
|
}
|
|
#endif
|
|
|
|
#ifdef ACCESSIBILITY
|
|
NS_IMETHODIMP nsHTMLScrollFrame::GetAccessible(nsIAccessible** aAccessible)
|
|
{
|
|
*aAccessible = nsnull;
|
|
if (!IsFocusable()) {
|
|
return NS_OK;
|
|
}
|
|
// Focusable via CSS, so needs to be in accessibility hierarchy
|
|
nsCOMPtr<nsIAccessibilityService> accService = do_GetService("@mozilla.org/accessibilityService;1");
|
|
|
|
if (accService) {
|
|
return accService->CreateHTMLGenericAccessible(static_cast<nsIFrame*>(this), aAccessible);
|
|
}
|
|
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
nsHTMLScrollFrame::CurPosAttributeChanged(nsIContent* aChild,
|
|
PRInt32 aModType)
|
|
{
|
|
mInner.CurPosAttributeChanged(aChild);
|
|
}
|
|
|
|
NS_INTERFACE_MAP_BEGIN(nsHTMLScrollFrame)
|
|
NS_INTERFACE_MAP_ENTRY(nsIAnonymousContentCreator)
|
|
#ifdef NS_DEBUG
|
|
NS_INTERFACE_MAP_ENTRY(nsIFrameDebug)
|
|
#endif
|
|
NS_INTERFACE_MAP_ENTRY(nsIScrollableFrame)
|
|
NS_INTERFACE_MAP_ENTRY(nsIScrollableViewProvider)
|
|
NS_INTERFACE_MAP_ENTRY(nsIStatefulFrame)
|
|
NS_INTERFACE_MAP_END_INHERITING(nsHTMLContainerFrame)
|
|
|
|
//----------nsXULScrollFrame-------------------------------------------
|
|
|
|
nsIFrame*
|
|
NS_NewXULScrollFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, PRBool aIsRoot)
|
|
{
|
|
return new (aPresShell) nsXULScrollFrame(aPresShell, aContext, aIsRoot);
|
|
}
|
|
|
|
nsXULScrollFrame::nsXULScrollFrame(nsIPresShell* aShell, nsStyleContext* aContext, PRBool aIsRoot)
|
|
: nsBoxFrame(aShell, aContext, aIsRoot),
|
|
mInner(this, aIsRoot, PR_TRUE)
|
|
{
|
|
SetLayoutManager(nsnull);
|
|
}
|
|
|
|
/**
|
|
* Get the view that we are scrolling within the scrolling view.
|
|
* @result child view
|
|
*/
|
|
nsIFrame* nsXULScrollFrame::GetScrolledFrame() const
|
|
{
|
|
return mInner.GetScrolledFrame();
|
|
}
|
|
|
|
nsIScrollableView* nsXULScrollFrame::GetScrollableView()
|
|
{
|
|
return mInner.GetScrollableView();
|
|
}
|
|
|
|
nsPoint nsXULScrollFrame::GetScrollPosition() const
|
|
{
|
|
nsIScrollableView* s = mInner.GetScrollableView();
|
|
nsPoint scrollPosition;
|
|
s->GetScrollPosition(scrollPosition.x, scrollPosition.y);
|
|
return scrollPosition;
|
|
}
|
|
|
|
void nsXULScrollFrame::ScrollTo(nsPoint aScrollPosition, PRUint32 aFlags)
|
|
{
|
|
nsIScrollableView* s = mInner.GetScrollableView();
|
|
s->ScrollTo(aScrollPosition.x, aScrollPosition.y, aFlags);
|
|
}
|
|
|
|
nsGfxScrollFrameInner::ScrollbarStyles
|
|
nsXULScrollFrame::GetScrollbarStyles() const {
|
|
return mInner.GetScrollbarStylesFromFrame();
|
|
}
|
|
|
|
nsMargin nsXULScrollFrame::GetDesiredScrollbarSizes(nsBoxLayoutState* aState) {
|
|
return mInner.GetDesiredScrollbarSizes(aState);
|
|
}
|
|
|
|
nsMargin nsGfxScrollFrameInner::GetDesiredScrollbarSizes(nsBoxLayoutState* aState) {
|
|
NS_ASSERTION(aState && aState->GetRenderingContext(),
|
|
"Must have rendering context in layout state for size "
|
|
"computations");
|
|
|
|
nsMargin result(0, 0, 0, 0);
|
|
|
|
if (mVScrollbarBox) {
|
|
nsSize size = mVScrollbarBox->GetPrefSize(*aState);
|
|
nsBox::AddMargin(mVScrollbarBox, size);
|
|
if (IsScrollbarOnRight())
|
|
result.left = size.width;
|
|
else
|
|
result.right = size.width;
|
|
}
|
|
|
|
if (mHScrollbarBox) {
|
|
nsSize size = mHScrollbarBox->GetPrefSize(*aState);
|
|
nsBox::AddMargin(mHScrollbarBox, size);
|
|
// We don't currently support any scripts that would require a scrollbar
|
|
// at the top. (Are there any?)
|
|
result.bottom = size.height;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
void nsXULScrollFrame::SetScrollbarVisibility(PRBool aVerticalVisible, PRBool aHorizontalVisible)
|
|
{
|
|
mInner.mNeverHasVerticalScrollbar = !aVerticalVisible;
|
|
mInner.mNeverHasHorizontalScrollbar = !aHorizontalVisible;
|
|
}
|
|
|
|
nsIBox* nsXULScrollFrame::GetScrollbarBox(PRBool aVertical)
|
|
{
|
|
return aVertical ? mInner.mVScrollbarBox : mInner.mHScrollbarBox;
|
|
}
|
|
|
|
nsresult
|
|
nsXULScrollFrame::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
|
|
{
|
|
return mInner.CreateAnonymousContent(aElements);
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::Destroy()
|
|
{
|
|
mInner.Destroy();
|
|
nsBoxFrame::Destroy();
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsXULScrollFrame::SetInitialChildList(nsIAtom* aListName,
|
|
nsIFrame* aChildList)
|
|
{
|
|
nsresult rv = nsBoxFrame::SetInitialChildList(aListName, aChildList);
|
|
|
|
mInner.CreateScrollableView();
|
|
mInner.ReloadChildFrames();
|
|
|
|
// listen for scroll events.
|
|
mInner.GetScrollableView()->AddScrollPositionListener(&mInner);
|
|
|
|
return rv;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
nsXULScrollFrame::AppendFrames(nsIAtom* aListName,
|
|
nsIFrame* aFrameList)
|
|
{
|
|
nsresult rv = nsBoxFrame::AppendFrames(aListName, aFrameList);
|
|
mInner.ReloadChildFrames();
|
|
return rv;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsXULScrollFrame::InsertFrames(nsIAtom* aListName,
|
|
nsIFrame* aPrevFrame,
|
|
nsIFrame* aFrameList)
|
|
{
|
|
nsresult rv = nsBoxFrame::InsertFrames(aListName, aPrevFrame, aFrameList);
|
|
mInner.ReloadChildFrames();
|
|
return rv;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsXULScrollFrame::RemoveFrame(nsIAtom* aListName,
|
|
nsIFrame* aOldFrame)
|
|
{
|
|
nsresult rv = nsBoxFrame::RemoveFrame(aListName, aOldFrame);
|
|
mInner.ReloadChildFrames();
|
|
return rv;
|
|
}
|
|
|
|
nsSplittableType
|
|
nsXULScrollFrame::GetSplittableType() const
|
|
{
|
|
return NS_FRAME_NOT_SPLITTABLE;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsXULScrollFrame::GetPadding(nsMargin& aMargin)
|
|
{
|
|
aMargin.SizeTo(0,0,0,0);
|
|
return NS_OK;
|
|
}
|
|
|
|
PRIntn
|
|
nsXULScrollFrame::GetSkipSides() const
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
nsIAtom*
|
|
nsXULScrollFrame::GetType() const
|
|
{
|
|
return nsGkAtoms::scrollFrame;
|
|
}
|
|
|
|
nscoord
|
|
nsXULScrollFrame::GetBoxAscent(nsBoxLayoutState& aState)
|
|
{
|
|
if (!mInner.mScrolledFrame)
|
|
return 0;
|
|
|
|
nscoord ascent = mInner.mScrolledFrame->GetBoxAscent(aState);
|
|
nsMargin m(0,0,0,0);
|
|
GetBorderAndPadding(m);
|
|
ascent += m.top;
|
|
GetMargin(m);
|
|
ascent += m.top;
|
|
|
|
return ascent;
|
|
}
|
|
|
|
nsSize
|
|
nsXULScrollFrame::GetPrefSize(nsBoxLayoutState& aState)
|
|
{
|
|
#ifdef DEBUG_LAYOUT
|
|
PropagateDebug(aState);
|
|
#endif
|
|
|
|
nsSize pref = mInner.mScrolledFrame->GetPrefSize(aState);
|
|
|
|
nsGfxScrollFrameInner::ScrollbarStyles styles = GetScrollbarStyles();
|
|
|
|
// scrolled frames don't have their own margins
|
|
|
|
if (mInner.mVScrollbarBox &&
|
|
styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
|
|
nsSize vSize = mInner.mVScrollbarBox->GetPrefSize(aState);
|
|
nsBox::AddMargin(mInner.mVScrollbarBox, vSize);
|
|
pref.width += vSize.width;
|
|
}
|
|
|
|
if (mInner.mHScrollbarBox &&
|
|
styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL) {
|
|
nsSize hSize = mInner.mHScrollbarBox->GetPrefSize(aState);
|
|
nsBox::AddMargin(mInner.mHScrollbarBox, hSize);
|
|
pref.height += hSize.height;
|
|
}
|
|
|
|
AddBorderAndPadding(pref);
|
|
nsIBox::AddCSSPrefSize(aState, this, pref);
|
|
return pref;
|
|
}
|
|
|
|
nsSize
|
|
nsXULScrollFrame::GetMinSize(nsBoxLayoutState& aState)
|
|
{
|
|
#ifdef DEBUG_LAYOUT
|
|
PropagateDebug(aState);
|
|
#endif
|
|
|
|
nsSize min = mInner.mScrolledFrame->GetMinSizeForScrollArea(aState);
|
|
|
|
nsGfxScrollFrameInner::ScrollbarStyles styles = GetScrollbarStyles();
|
|
|
|
if (mInner.mVScrollbarBox &&
|
|
styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
|
|
nsSize vSize = mInner.mVScrollbarBox->GetMinSize(aState);
|
|
AddMargin(mInner.mVScrollbarBox, vSize);
|
|
min.width += vSize.width;
|
|
if (min.height < vSize.height)
|
|
min.height = vSize.height;
|
|
}
|
|
|
|
if (mInner.mHScrollbarBox &&
|
|
styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL) {
|
|
nsSize hSize = mInner.mHScrollbarBox->GetMinSize(aState);
|
|
AddMargin(mInner.mHScrollbarBox, hSize);
|
|
min.height += hSize.height;
|
|
if (min.width < hSize.width)
|
|
min.width = hSize.width;
|
|
}
|
|
|
|
AddBorderAndPadding(min);
|
|
nsIBox::AddCSSMinSize(aState, this, min);
|
|
return min;
|
|
}
|
|
|
|
nsSize
|
|
nsXULScrollFrame::GetMaxSize(nsBoxLayoutState& aState)
|
|
{
|
|
#ifdef DEBUG_LAYOUT
|
|
PropagateDebug(aState);
|
|
#endif
|
|
|
|
nsSize max(NS_INTRINSICSIZE, NS_INTRINSICSIZE);
|
|
|
|
AddBorderAndPadding(max);
|
|
nsIBox::AddCSSMaxSize(aState, this, max);
|
|
return max;
|
|
}
|
|
|
|
#if 0 // XXXldb I don't think this is even needed
|
|
/* virtual */ nscoord
|
|
nsXULScrollFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
|
|
{
|
|
nsStyleUnit widthUnit = GetStylePosition()->mWidth.GetUnit();
|
|
if (widthUnit == eStyleUnit_Percent || widthUnit == eStyleUnit_Auto) {
|
|
nsMargin border = aReflowState.mComputedBorderPadding;
|
|
aDesiredSize.mMaxElementWidth = border.right + border.left;
|
|
mMaxElementWidth = aDesiredSize.mMaxElementWidth;
|
|
} else {
|
|
NS_NOTYETIMPLEMENTED("Use the info from the scrolled frame");
|
|
#if 0
|
|
// if not set then use the cached size. If set then set it.
|
|
if (aDesiredSize.mMaxElementWidth == -1)
|
|
aDesiredSize.mMaxElementWidth = mMaxElementWidth;
|
|
else
|
|
mMaxElementWidth = aDesiredSize.mMaxElementWidth;
|
|
#endif
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
NS_IMETHODIMP_(nsrefcnt)
|
|
nsXULScrollFrame::AddRef(void)
|
|
{
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP_(nsrefcnt)
|
|
nsXULScrollFrame::Release(void)
|
|
{
|
|
return NS_OK;
|
|
}
|
|
|
|
#ifdef NS_DEBUG
|
|
NS_IMETHODIMP
|
|
nsXULScrollFrame::GetFrameName(nsAString& aResult) const
|
|
{
|
|
return MakeFrameName(NS_LITERAL_STRING("XULScroll"), aResult);
|
|
}
|
|
#endif
|
|
|
|
void nsXULScrollFrame::CurPosAttributeChanged(nsIContent* aChild, PRInt32 aModType)
|
|
{
|
|
mInner.CurPosAttributeChanged(aChild);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsXULScrollFrame::DoLayout(nsBoxLayoutState& aState)
|
|
{
|
|
PRUint32 flags = aState.LayoutFlags();
|
|
nsresult rv = Layout(aState);
|
|
aState.SetLayoutFlags(flags);
|
|
|
|
nsBox::DoLayout(aState);
|
|
return rv;
|
|
}
|
|
|
|
NS_INTERFACE_MAP_BEGIN(nsXULScrollFrame)
|
|
NS_INTERFACE_MAP_ENTRY(nsIAnonymousContentCreator)
|
|
#ifdef NS_DEBUG
|
|
NS_INTERFACE_MAP_ENTRY(nsIFrameDebug)
|
|
#endif
|
|
NS_INTERFACE_MAP_ENTRY(nsIScrollableFrame)
|
|
NS_INTERFACE_MAP_ENTRY(nsIScrollableViewProvider)
|
|
NS_INTERFACE_MAP_ENTRY(nsIStatefulFrame)
|
|
NS_INTERFACE_MAP_END_INHERITING(nsBoxFrame)
|
|
|
|
|
|
|
|
//-------------------- Inner ----------------------
|
|
|
|
nsGfxScrollFrameInner::nsGfxScrollFrameInner(nsContainerFrame* aOuter,
|
|
PRBool aIsRoot,
|
|
PRBool aIsXUL)
|
|
: mScrollableView(nsnull),
|
|
mHScrollbarBox(nsnull),
|
|
mVScrollbarBox(nsnull),
|
|
mScrolledFrame(nsnull),
|
|
mScrollCornerBox(nsnull),
|
|
mOuter(aOuter),
|
|
mRestoreRect(-1, -1, -1, -1),
|
|
mLastPos(-1, -1),
|
|
mNeverHasVerticalScrollbar(PR_FALSE),
|
|
mNeverHasHorizontalScrollbar(PR_FALSE),
|
|
mHasVerticalScrollbar(PR_FALSE),
|
|
mHasHorizontalScrollbar(PR_FALSE),
|
|
mViewInitiatedScroll(PR_FALSE),
|
|
mFrameInitiatedScroll(PR_FALSE),
|
|
mDidHistoryRestore(PR_FALSE),
|
|
mIsRoot(aIsRoot),
|
|
mIsXUL(aIsXUL),
|
|
mSupppressScrollbarUpdate(PR_FALSE),
|
|
mSkippedScrollbarLayout(PR_FALSE),
|
|
mDidLoadHistoryVScrollbarHint(PR_FALSE),
|
|
mHistoryVScrollbarHint(PR_FALSE),
|
|
mHadNonInitialReflow(PR_FALSE),
|
|
mHorizontalOverflow(PR_FALSE),
|
|
mVerticalOverflow(PR_FALSE),
|
|
mPostedReflowCallback(PR_FALSE)
|
|
{
|
|
}
|
|
|
|
nsGfxScrollFrameInner::~nsGfxScrollFrameInner()
|
|
{
|
|
}
|
|
|
|
NS_IMETHODIMP_(nsrefcnt) nsGfxScrollFrameInner::AddRef(void)
|
|
{
|
|
return 2;
|
|
}
|
|
|
|
NS_IMETHODIMP_(nsrefcnt) nsGfxScrollFrameInner::Release(void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
NS_IMPL_QUERY_INTERFACE1(nsGfxScrollFrameInner, nsIScrollPositionListener)
|
|
|
|
nsresult
|
|
nsGfxScrollFrameInner::BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists)
|
|
{
|
|
nsresult rv = mOuter->DisplayBorderBackgroundOutline(aBuilder, aLists);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (aBuilder->GetIgnoreScrollFrame() == mOuter) {
|
|
// Don't clip the scrolled child, and don't paint scrollbars/scrollcorner.
|
|
// The scrolled frame shouldn't have its own background/border, so we
|
|
// can just pass aLists directly. We do need to replace aDirtyRect with
|
|
// the scrolled area though, since callers may have restricted aDirtyRect
|
|
// to our bounds.
|
|
nsRect newDirty = GetScrolledRect(GetScrollPortSize()) +
|
|
aBuilder->ToReferenceFrame(mScrolledFrame);
|
|
return mOuter->BuildDisplayListForChild(aBuilder, mScrolledFrame, newDirty, aLists);
|
|
}
|
|
|
|
// Overflow clipping can never clip frames outside our subtree, so there
|
|
// is no need to worry about whether we are a moving frame that might clip
|
|
// non-moving frames.
|
|
nsRect frameClip = mScrollableView->View()->GetBounds();
|
|
nsRect dirtyRect;
|
|
// Not all our descendants will be clipped by overflow clipping, but all
|
|
// the ones that aren't clipped will be out of flow frames that have already
|
|
// had dirty rects saved for them by their parent frames calling
|
|
// MarkOutOfFlowChildrenForDisplayList, so it's safe to restrict our
|
|
// dirty rect here.
|
|
dirtyRect.IntersectRect(aDirtyRect, frameClip);
|
|
|
|
nsDisplayListCollection set;
|
|
rv = mOuter->BuildDisplayListForChild(aBuilder, mScrolledFrame, dirtyRect, set);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
nsRect clip = frameClip + aBuilder->ToReferenceFrame(mOuter);
|
|
// mScrolledFrame may have given us a background, e.g., the scrolled canvas
|
|
// frame below the viewport. If so, we want it to be clipped. We also want
|
|
// to end up on our BorderBackground list.
|
|
// If we are the viewport scrollframe, then clip all our descendants (to ensure
|
|
// that fixed-pos elements get clipped by us).
|
|
rv = mOuter->OverflowClip(aBuilder, set, aLists, clip, PR_TRUE, mIsRoot);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
// Now display the scrollbars and scrollcorner
|
|
nsIFrame* kid = mOuter->GetFirstChild(nsnull);
|
|
// Put each child's background directly onto the content list
|
|
nsDisplayListSet scrollbarSet(aLists, aLists.Content());
|
|
while (kid) {
|
|
if (kid != mScrolledFrame) {
|
|
rv = mOuter->BuildDisplayListForChild(aBuilder, kid, aDirtyRect, scrollbarSet,
|
|
nsIFrame::DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
}
|
|
kid = kid->GetNextSibling();
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::InvalidateInternal(const nsRect& aDamageRect,
|
|
nscoord aX, nscoord aY, nsIFrame* aForChild,
|
|
PRBool aImmediate)
|
|
{
|
|
nsPoint pt = mOuter->GetPosition();
|
|
|
|
if (aForChild == mScrolledFrame) {
|
|
// restrict aDamageRect to the scrollable view's bounds
|
|
nsRect r;
|
|
if (r.IntersectRect(aDamageRect, mScrollableView->View()->GetBounds() - nsPoint(aX, aY))) {
|
|
mOuter->GetParent()->
|
|
InvalidateInternal(r, aX + pt.x, aY + pt.y, mOuter, aImmediate);
|
|
}
|
|
return;
|
|
}
|
|
|
|
mOuter->GetParent()->
|
|
InvalidateInternal(aDamageRect, aX + pt.x, aY + pt.y, mOuter, aImmediate);
|
|
}
|
|
|
|
PRBool
|
|
nsGfxScrollFrameInner::NeedsClipWidget() const
|
|
{
|
|
// Scrollports contained in form controls (e.g., listboxes) don't get
|
|
// widgets.
|
|
for (nsIFrame* parentFrame = mOuter; parentFrame;
|
|
parentFrame = parentFrame->GetParent()) {
|
|
nsIFormControlFrame* fcFrame;
|
|
if ((NS_SUCCEEDED(parentFrame->QueryInterface(NS_GET_IID(nsIFormControlFrame), (void**)&fcFrame)))) {
|
|
return PR_FALSE;
|
|
}
|
|
}
|
|
|
|
// Scrollports that don't ever show associated scrollbars don't get
|
|
// widgets, because they will seldom actually be scrolled.
|
|
nsIScrollableFrame *scrollableFrame;
|
|
CallQueryInterface(mOuter, &scrollableFrame);
|
|
ScrollbarStyles scrollbars = scrollableFrame->GetScrollbarStyles();
|
|
if ((scrollbars.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN
|
|
|| scrollbars.mHorizontal == NS_STYLE_OVERFLOW_VISIBLE)
|
|
&& (scrollbars.mVertical == NS_STYLE_OVERFLOW_HIDDEN
|
|
|| scrollbars.mVertical == NS_STYLE_OVERFLOW_VISIBLE)) {
|
|
return PR_FALSE;
|
|
}
|
|
|
|
return PR_TRUE;
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::CreateScrollableView()
|
|
{
|
|
nsIView* outerView = mOuter->GetView();
|
|
NS_ASSERTION(outerView, "scrollframes must have views");
|
|
nsIViewManager* viewManager = outerView->GetViewManager();
|
|
mScrollableView = viewManager->CreateScrollableView(mOuter->GetRect(), outerView);
|
|
if (!mScrollableView)
|
|
return;
|
|
|
|
nsIView* view = mScrollableView->View();
|
|
|
|
// Insert the view into the view hierarchy
|
|
viewManager->InsertChild(outerView, view, nsnull, PR_TRUE);
|
|
|
|
// Have the scrolling view create its internal widgets
|
|
if (NeedsClipWidget()) {
|
|
mScrollableView->CreateScrollControls();
|
|
}
|
|
}
|
|
|
|
static void HandleScrollPref(nsIScrollable *aScrollable, PRInt32 aOrientation,
|
|
PRUint8& aValue)
|
|
{
|
|
PRInt32 pref;
|
|
aScrollable->GetDefaultScrollbarPreferences(aOrientation, &pref);
|
|
switch (pref) {
|
|
case nsIScrollable::Scrollbar_Auto:
|
|
// leave |aValue| untouched
|
|
break;
|
|
case nsIScrollable::Scrollbar_Never:
|
|
aValue = NS_STYLE_OVERFLOW_HIDDEN;
|
|
break;
|
|
case nsIScrollable::Scrollbar_Always:
|
|
aValue = NS_STYLE_OVERFLOW_SCROLL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
nsIView*
|
|
nsGfxScrollFrameInner::GetParentViewForChildFrame(nsIFrame* aFrame) const
|
|
{
|
|
if (aFrame->GetContent() == mOuter->GetContent()) {
|
|
NS_ASSERTION(mScrollableView, "Scrollable view should have been created by now");
|
|
// scrolled frame, put it under our anonymous view
|
|
return mScrollableView->View();
|
|
}
|
|
// scrollbars and stuff; put them under our regular view
|
|
return mOuter->GetView();
|
|
}
|
|
|
|
nsGfxScrollFrameInner::ScrollbarStyles
|
|
nsGfxScrollFrameInner::GetScrollbarStylesFromFrame() const
|
|
{
|
|
ScrollbarStyles result;
|
|
|
|
nsPresContext* presContext = mOuter->PresContext();
|
|
if (!presContext->IsDynamic() &&
|
|
!(mIsRoot && presContext->HasPaginatedScrolling())) {
|
|
return ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, NS_STYLE_OVERFLOW_HIDDEN);
|
|
}
|
|
|
|
if (mIsRoot) {
|
|
result = presContext->GetViewportOverflowOverride();
|
|
|
|
nsCOMPtr<nsISupports> container = presContext->GetContainer();
|
|
nsCOMPtr<nsIScrollable> scrollable = do_QueryInterface(container);
|
|
if (scrollable) {
|
|
HandleScrollPref(scrollable, nsIScrollable::ScrollOrientation_X,
|
|
result.mHorizontal);
|
|
HandleScrollPref(scrollable, nsIScrollable::ScrollOrientation_Y,
|
|
result.mVertical);
|
|
}
|
|
} else {
|
|
const nsStyleDisplay *disp = mOuter->GetStyleDisplay();
|
|
result.mHorizontal = disp->mOverflowX;
|
|
result.mVertical = disp->mOverflowY;
|
|
}
|
|
|
|
NS_ASSERTION(result.mHorizontal != NS_STYLE_OVERFLOW_VISIBLE &&
|
|
result.mHorizontal != NS_STYLE_OVERFLOW_CLIP &&
|
|
result.mVertical != NS_STYLE_OVERFLOW_VISIBLE &&
|
|
result.mVertical != NS_STYLE_OVERFLOW_CLIP,
|
|
"scrollbars should not have been created");
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* this code is resposible for restoring the scroll position back to some
|
|
* saved position. if the user has not moved the scroll position manually
|
|
* we keep scrolling down until we get to our original position. keep in
|
|
* mind that content could incrementally be coming in. we only want to stop
|
|
* when we reach our new position.
|
|
*/
|
|
void
|
|
nsGfxScrollFrameInner::ScrollToRestoredPosition()
|
|
{
|
|
nsIScrollableView* scrollingView = GetScrollableView();
|
|
if (!scrollingView) {
|
|
return;
|
|
}
|
|
if (mRestoreRect.y == -1 || mLastPos.x == -1 || mLastPos.y == -1) {
|
|
return;
|
|
}
|
|
// make sure our scroll position did not change for where we last put
|
|
// it. if it does then the user must have moved it, and we no longer
|
|
// need to restore.
|
|
nscoord x = 0;
|
|
nscoord y = 0;
|
|
scrollingView->GetScrollPosition(x, y);
|
|
|
|
// if we didn't move, we still need to restore
|
|
if (x == mLastPos.x && y == mLastPos.y) {
|
|
nsRect childRect(0, 0, 0, 0);
|
|
nsIView* child = nsnull;
|
|
nsresult rv = scrollingView->GetScrolledView(child);
|
|
if (NS_SUCCEEDED(rv) && child)
|
|
childRect = child->GetBounds();
|
|
|
|
PRInt32 cx, cy, x, y;
|
|
scrollingView->GetScrollPosition(cx,cy);
|
|
|
|
x = (int)mRestoreRect.x;
|
|
y = (int)mRestoreRect.y;
|
|
|
|
// if our position is greater than the scroll position, scroll.
|
|
// remember that we could be incrementally loading so we may enter
|
|
// and scroll many times.
|
|
if (y != cy || x != cx) {
|
|
scrollingView->ScrollTo(x, y, 0);
|
|
// scrollpostion goes from twips to pixels. this fixes any roundoff
|
|
// problems.
|
|
scrollingView->GetScrollPosition(mLastPos.x, mLastPos.y);
|
|
} else {
|
|
// if we reached the position then stop
|
|
mRestoreRect.y = -1;
|
|
mLastPos.x = -1;
|
|
mLastPos.y = -1;
|
|
}
|
|
} else {
|
|
// user moved the position, so we won't need to restore
|
|
mLastPos.x = -1;
|
|
mLastPos.y = -1;
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
nsGfxScrollFrameInner::FireScrollPortEvent()
|
|
{
|
|
mAsyncScrollPortEvent.Forget();
|
|
|
|
// Keep this in sync with PostOverflowEvent().
|
|
nsSize scrollportSize = GetScrollPortSize();
|
|
nsSize childSize = GetScrolledRect(scrollportSize).Size();
|
|
|
|
PRBool newVerticalOverflow = childSize.height > scrollportSize.height;
|
|
PRBool vertChanged = mVerticalOverflow != newVerticalOverflow;
|
|
|
|
PRBool newHorizontalOverflow = childSize.width > scrollportSize.width;
|
|
PRBool horizChanged = mHorizontalOverflow != newHorizontalOverflow;
|
|
|
|
if (!vertChanged && !horizChanged) {
|
|
return NS_OK;
|
|
}
|
|
|
|
// If both either overflowed or underflowed then we dispatch only one
|
|
// DOM event.
|
|
PRBool both = vertChanged && horizChanged &&
|
|
newVerticalOverflow == newHorizontalOverflow;
|
|
nsScrollPortEvent::orientType orient;
|
|
if (both) {
|
|
orient = nsScrollPortEvent::both;
|
|
mHorizontalOverflow = newHorizontalOverflow;
|
|
mVerticalOverflow = newVerticalOverflow;
|
|
}
|
|
else if (vertChanged) {
|
|
orient = nsScrollPortEvent::vertical;
|
|
mVerticalOverflow = newVerticalOverflow;
|
|
if (horizChanged) {
|
|
// We need to dispatch a separate horizontal DOM event. Do that the next
|
|
// time around since dispatching the vertical DOM event might destroy
|
|
// the frame.
|
|
PostOverflowEvent();
|
|
}
|
|
}
|
|
else {
|
|
orient = nsScrollPortEvent::horizontal;
|
|
mHorizontalOverflow = newHorizontalOverflow;
|
|
}
|
|
|
|
nsScrollPortEvent event(PR_TRUE,
|
|
(orient == nsScrollPortEvent::horizontal ?
|
|
mHorizontalOverflow : mVerticalOverflow) ?
|
|
NS_SCROLLPORT_OVERFLOW : NS_SCROLLPORT_UNDERFLOW,
|
|
nsnull);
|
|
event.orient = orient;
|
|
return nsEventDispatcher::Dispatch(mOuter->GetContent(),
|
|
mOuter->PresContext(), &event);
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::ReloadChildFrames()
|
|
{
|
|
mScrolledFrame = nsnull;
|
|
mHScrollbarBox = nsnull;
|
|
mVScrollbarBox = nsnull;
|
|
mScrollCornerBox = nsnull;
|
|
|
|
nsIFrame* frame = mOuter->GetFirstChild(nsnull);
|
|
while (frame) {
|
|
nsIContent* content = frame->GetContent();
|
|
if (content == mOuter->GetContent()) {
|
|
NS_ASSERTION(!mScrolledFrame, "Already found the scrolled frame");
|
|
mScrolledFrame = frame;
|
|
} else {
|
|
nsAutoString value;
|
|
content->GetAttr(kNameSpaceID_None, nsGkAtoms::orient, value);
|
|
if (!value.IsEmpty()) {
|
|
// probably a scrollbar then
|
|
if (value.LowerCaseEqualsLiteral("horizontal")) {
|
|
NS_ASSERTION(!mHScrollbarBox, "Found multiple horizontal scrollbars?");
|
|
mHScrollbarBox = frame;
|
|
} else {
|
|
NS_ASSERTION(!mVScrollbarBox, "Found multiple vertical scrollbars?");
|
|
mVScrollbarBox = frame;
|
|
}
|
|
} else {
|
|
// probably a scrollcorner
|
|
NS_ASSERTION(!mScrollCornerBox, "Found multiple scrollcorners");
|
|
mScrollCornerBox = frame;
|
|
}
|
|
}
|
|
|
|
frame = frame->GetNextSibling();
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
nsGfxScrollFrameInner::CreateAnonymousContent(nsTArray<nsIContent*>& aElements)
|
|
{
|
|
nsPresContext* presContext = mOuter->PresContext();
|
|
nsIFrame* parent = mOuter->GetParent();
|
|
|
|
// Don't create scrollbars if we're printing/print previewing
|
|
// Get rid of this code when printing moves to its own presentation
|
|
if (!presContext->IsDynamic()) {
|
|
// allow scrollbars if this is the child of the viewport, because
|
|
// we must be the scrollbars for the print preview window
|
|
if (!(mIsRoot && presContext->HasPaginatedScrolling())) {
|
|
mNeverHasVerticalScrollbar = mNeverHasHorizontalScrollbar = PR_TRUE;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
nsIScrollableFrame *scrollable;
|
|
CallQueryInterface(mOuter, &scrollable);
|
|
|
|
// At this stage in frame construction, the document element and/or
|
|
// BODY overflow styles have not yet been propagated to the
|
|
// viewport. So GetScrollbarStylesFromFrame called here will only
|
|
// take into account the scrollbar preferences set on the docshell.
|
|
// Thus if no scrollbar preferences are set on the docshell, we will
|
|
// always create scrollbars, which means later dynamic changes to
|
|
// propagated overflow styles will show or hide scrollbars on the
|
|
// viewport without requiring frame reconstruction of the viewport
|
|
// (good!).
|
|
|
|
// XXX On the other hand, if scrolling="no" is set on the container
|
|
// we won't create scrollbars here so no scrollbars will ever be
|
|
// created even if the container's scrolling attribute is later
|
|
// changed. However, this has never been supported.
|
|
ScrollbarStyles styles = scrollable->GetScrollbarStyles();
|
|
PRBool canHaveHorizontal = styles.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN;
|
|
PRBool canHaveVertical = styles.mVertical != NS_STYLE_OVERFLOW_HIDDEN;
|
|
if (!canHaveHorizontal && !canHaveVertical) {
|
|
// Nothing to do.
|
|
return NS_OK;
|
|
}
|
|
|
|
// The anonymous <div> used by <inputs> never gets scrollbars.
|
|
nsITextControlFrame* textFrame = nsnull;
|
|
CallQueryInterface(parent, &textFrame);
|
|
if (textFrame) {
|
|
// Make sure we are not a text area.
|
|
nsCOMPtr<nsIDOMHTMLTextAreaElement> textAreaElement(do_QueryInterface(parent->GetContent()));
|
|
if (!textAreaElement) {
|
|
mNeverHasVerticalScrollbar = mNeverHasHorizontalScrollbar = PR_TRUE;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
nsresult rv;
|
|
|
|
nsNodeInfoManager *nodeInfoManager =
|
|
presContext->Document()->NodeInfoManager();
|
|
nsCOMPtr<nsINodeInfo> nodeInfo;
|
|
rv = nodeInfoManager->GetNodeInfo(nsGkAtoms::scrollbar, nsnull,
|
|
kNameSpaceID_XUL, getter_AddRefs(nodeInfo));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (canHaveHorizontal) {
|
|
rv = NS_NewElement(getter_AddRefs(mHScrollbarContent),
|
|
kNameSpaceID_XUL, nodeInfo);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
mHScrollbarContent->SetAttr(kNameSpaceID_None, nsGkAtoms::orient,
|
|
NS_LITERAL_STRING("horizontal"), PR_FALSE);
|
|
if (!aElements.AppendElement(mHScrollbarContent))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
if (canHaveVertical) {
|
|
rv = NS_NewElement(getter_AddRefs(mVScrollbarContent),
|
|
kNameSpaceID_XUL, nodeInfo);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
mVScrollbarContent->SetAttr(kNameSpaceID_None, nsGkAtoms::orient,
|
|
NS_LITERAL_STRING("vertical"), PR_FALSE);
|
|
if (!aElements.AppendElement(mVScrollbarContent))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
if (canHaveHorizontal && canHaveVertical) {
|
|
nodeInfoManager->GetNodeInfo(nsGkAtoms::scrollcorner, nsnull,
|
|
kNameSpaceID_XUL, getter_AddRefs(nodeInfo));
|
|
rv = NS_NewElement(getter_AddRefs(mScrollCornerContent),
|
|
kNameSpaceID_XUL, nodeInfo);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
if (!aElements.AppendElement(mScrollCornerContent))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::Destroy()
|
|
{
|
|
// Unbind any content created in CreateAnonymousContent from the tree
|
|
nsContentUtils::DestroyAnonymousContent(&mHScrollbarContent);
|
|
nsContentUtils::DestroyAnonymousContent(&mVScrollbarContent);
|
|
nsContentUtils::DestroyAnonymousContent(&mScrollCornerContent);
|
|
|
|
mScrollEvent.Revoke();
|
|
mAsyncScrollPortEvent.Revoke();
|
|
if (mPostedReflowCallback) {
|
|
mOuter->PresContext()->PresShell()->CancelReflowCallback(this);
|
|
mPostedReflowCallback = PR_FALSE;
|
|
}
|
|
nsIScrollableView *view = GetScrollableView();
|
|
NS_ASSERTION(view, "unexpected null pointer");
|
|
if (view)
|
|
view->RemoveScrollPositionListener(this);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsGfxScrollFrameInner::ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
|
|
{
|
|
// Do nothing.
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* Called when we want to update the scrollbar position, either because scrolling happened
|
|
* or the user moved the scrollbar position and we need to undo that (e.g., when the user
|
|
* clicks to scroll and we're using smooth scrolling, so we need to put the thumb back
|
|
* to its initial position for the start of the smooth sequence).
|
|
*/
|
|
void
|
|
nsGfxScrollFrameInner::InternalScrollPositionDidChange(nscoord aX, nscoord aY)
|
|
{
|
|
if (mVScrollbarBox)
|
|
SetCoordAttribute(mVScrollbarBox->GetContent(), nsGkAtoms::curpos,
|
|
aY - GetScrolledRect(GetScrollPortSize()).y);
|
|
|
|
if (mHScrollbarBox)
|
|
SetCoordAttribute(mHScrollbarBox->GetContent(), nsGkAtoms::curpos,
|
|
aX - GetScrolledRect(GetScrollPortSize()).x);
|
|
}
|
|
|
|
/**
|
|
* Called whenever actual scrolling happens for any reason.
|
|
*/
|
|
NS_IMETHODIMP
|
|
nsGfxScrollFrameInner::ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
|
|
{
|
|
NS_ASSERTION(!mViewInitiatedScroll, "Cannot reenter ScrollPositionDidChange");
|
|
|
|
// Update frame position to match view offsets
|
|
nsPoint childOffset = mScrolledFrame->GetView()->GetOffsetTo(mOuter->GetView());
|
|
mScrolledFrame->SetPosition(childOffset);
|
|
|
|
mViewInitiatedScroll = PR_TRUE;
|
|
InternalScrollPositionDidChange(aX, aY);
|
|
mViewInitiatedScroll = PR_FALSE;
|
|
|
|
PostScrollEvent();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void nsGfxScrollFrameInner::CurPosAttributeChanged(nsIContent* aContent)
|
|
{
|
|
NS_ASSERTION(aContent, "aContent must not be null");
|
|
NS_ASSERTION((mHScrollbarBox && mHScrollbarBox->GetContent() == aContent) ||
|
|
(mVScrollbarBox && mVScrollbarBox->GetContent() == aContent),
|
|
"unexpected child");
|
|
|
|
// Attribute changes on the scrollbars happen in one of three ways:
|
|
// 1) The scrollbar changed the attribute in response to some user event
|
|
// 2) We changed the attribute in response to a ScrollPositionDidChange
|
|
// callback from the scrolling view
|
|
// 3) We changed the attribute to adjust the scrollbars for the start
|
|
// of a smooth scroll operation
|
|
//
|
|
// In case 2), we don't need to scroll the view because the scrolling
|
|
// has already happened. In case 3) we don't need to scroll because
|
|
// we're just adjusting the scrollbars back to the correct setting
|
|
// for the view.
|
|
//
|
|
// Cases 1) and 3) do not indicate that actual scrolling has happened. Only
|
|
// case 2) indicates actual scrolling. Therefore we do not fire onscroll
|
|
// here, but in ScrollPositionDidChange.
|
|
//
|
|
// We used to detect this case implicitly because we'd compare the
|
|
// scrollbar attributes with the view's current scroll position and
|
|
// bail out if they were equal. But that approach is fragile; it can
|
|
// fail when, for example, the view scrolls horizontally and
|
|
// vertically simultaneously; we'll get here when only the vertical
|
|
// attribute has been set, so the attributes and the view scroll
|
|
// position don't yet agree, and we'd tell the view to scroll to the
|
|
// new vertical position and the old horizontal position! Even worse
|
|
// things could happen when smooth scrolling got involved ... crashes
|
|
// and other terrors.
|
|
if (mViewInitiatedScroll || mFrameInitiatedScroll) return;
|
|
|
|
nsRect scrolledRect = GetScrolledRect(GetScrollPortSize());
|
|
|
|
nscoord x = GetCoordAttribute(mHScrollbarBox, nsGkAtoms::curpos,
|
|
-scrolledRect.x) +
|
|
scrolledRect.x;
|
|
nscoord y = GetCoordAttribute(mVScrollbarBox, nsGkAtoms::curpos,
|
|
-scrolledRect.y) +
|
|
scrolledRect.y;
|
|
|
|
// Make sure the scrollbars indeed moved before firing the event.
|
|
// I think it is OK to prevent the call to ScrollbarChanged()
|
|
// if we didn't actually move. The following check is the first
|
|
// thing ScrollbarChanged() does anyway, before deciding to move
|
|
// the scrollbars.
|
|
nscoord curPosX=0, curPosY=0;
|
|
nsIScrollableView* s = GetScrollableView();
|
|
if (s) {
|
|
s->GetScrollPosition(curPosX, curPosY);
|
|
if (x == curPosX && y == curPosY)
|
|
return;
|
|
|
|
PRBool isSmooth = aContent->HasAttr(kNameSpaceID_None, nsGkAtoms::smooth);
|
|
|
|
if (isSmooth) {
|
|
// Make sure an attribute-setting callback occurs even if the view
|
|
// didn't actually move yet. We need to make sure other listeners
|
|
// see that the scroll position is not (yet) what they thought it
|
|
// was.
|
|
|
|
NS_ASSERTION(!mFrameInitiatedScroll, "Unexpected reentry");
|
|
// Make sure we don't do anything in when the view calls us back
|
|
// for this scroll operation.
|
|
mFrameInitiatedScroll = PR_TRUE;
|
|
InternalScrollPositionDidChange(curPosX, curPosY);
|
|
mFrameInitiatedScroll = PR_FALSE;
|
|
}
|
|
ScrollbarChanged(mOuter->PresContext(), x, y, isSmooth ? NS_VMREFRESH_SMOOTHSCROLL : 0);
|
|
}
|
|
}
|
|
|
|
/* ============= Scroll events ========== */
|
|
|
|
NS_IMETHODIMP
|
|
nsGfxScrollFrameInner::ScrollEvent::Run()
|
|
{
|
|
if (mInner)
|
|
mInner->FireScrollEvent();
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::FireScrollEvent()
|
|
{
|
|
mScrollEvent.Forget();
|
|
|
|
nsScrollbarEvent event(PR_TRUE, NS_SCROLL_EVENT, nsnull);
|
|
nsEventStatus status = nsEventStatus_eIgnore;
|
|
nsIContent* content = mOuter->GetContent();
|
|
nsPresContext* prescontext = mOuter->PresContext();
|
|
// Fire viewport scroll events at the document (where they
|
|
// will bubble to the window)
|
|
if (mIsRoot) {
|
|
nsIDocument* doc = content->GetCurrentDoc();
|
|
if (doc) {
|
|
nsEventDispatcher::Dispatch(doc, prescontext, &event, nsnull, &status);
|
|
}
|
|
} else {
|
|
// scroll events fired at elements don't bubble (although scroll events
|
|
// fired at documents do, to the window)
|
|
event.flags |= NS_EVENT_FLAG_CANT_BUBBLE;
|
|
nsEventDispatcher::Dispatch(content, prescontext, &event, nsnull, &status);
|
|
}
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::PostScrollEvent()
|
|
{
|
|
if (mScrollEvent.IsPending())
|
|
return;
|
|
|
|
nsRefPtr<ScrollEvent> ev = new ScrollEvent(this);
|
|
if (NS_FAILED(NS_DispatchToCurrentThread(ev))) {
|
|
NS_WARNING("failed to dispatch ScrollEvent");
|
|
} else {
|
|
mScrollEvent = ev;
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsGfxScrollFrameInner::AsyncScrollPortEvent::Run()
|
|
{
|
|
if (mInner) {
|
|
mInner->mOuter->PresContext()->GetPresShell()->
|
|
FlushPendingNotifications(Flush_Layout);
|
|
}
|
|
return mInner ? mInner->FireScrollPortEvent() : NS_OK;
|
|
}
|
|
|
|
PRBool
|
|
nsXULScrollFrame::AddHorizontalScrollbar(nsBoxLayoutState& aState,
|
|
nsRect& aScrollAreaSize, PRBool aOnTop)
|
|
{
|
|
if (!mInner.mHScrollbarBox)
|
|
return PR_TRUE;
|
|
|
|
return AddRemoveScrollbar(aState, aScrollAreaSize, aOnTop, PR_TRUE, PR_TRUE);
|
|
}
|
|
|
|
PRBool
|
|
nsXULScrollFrame::AddVerticalScrollbar(nsBoxLayoutState& aState,
|
|
nsRect& aScrollAreaSize, PRBool aOnRight)
|
|
{
|
|
if (!mInner.mVScrollbarBox)
|
|
return PR_TRUE;
|
|
|
|
return AddRemoveScrollbar(aState, aScrollAreaSize, aOnRight, PR_FALSE, PR_TRUE);
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::RemoveHorizontalScrollbar(nsBoxLayoutState& aState,
|
|
nsRect& aScrollAreaSize, PRBool aOnTop)
|
|
{
|
|
// removing a scrollbar should always fit
|
|
#ifdef DEBUG
|
|
PRBool result =
|
|
#endif
|
|
AddRemoveScrollbar(aState, aScrollAreaSize, aOnTop, PR_TRUE, PR_FALSE);
|
|
NS_ASSERTION(result, "Removing horizontal scrollbar failed to fit??");
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::RemoveVerticalScrollbar(nsBoxLayoutState& aState,
|
|
nsRect& aScrollAreaSize, PRBool aOnRight)
|
|
{
|
|
// removing a scrollbar should always fit
|
|
#ifdef DEBUG
|
|
PRBool result =
|
|
#endif
|
|
AddRemoveScrollbar(aState, aScrollAreaSize, aOnRight, PR_FALSE, PR_FALSE);
|
|
NS_ASSERTION(result, "Removing vertical scrollbar failed to fit??");
|
|
}
|
|
|
|
PRBool
|
|
nsXULScrollFrame::AddRemoveScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize,
|
|
PRBool aOnTop, PRBool aHorizontal, PRBool aAdd)
|
|
{
|
|
if (aHorizontal) {
|
|
if (mInner.mNeverHasHorizontalScrollbar || !mInner.mHScrollbarBox)
|
|
return PR_FALSE;
|
|
|
|
nsSize hSize = mInner.mHScrollbarBox->GetPrefSize(aState);
|
|
nsBox::AddMargin(mInner.mHScrollbarBox, hSize);
|
|
|
|
mInner.SetScrollbarVisibility(mInner.mHScrollbarBox, aAdd);
|
|
|
|
PRBool hasHorizontalScrollbar;
|
|
PRBool fit = AddRemoveScrollbar(hasHorizontalScrollbar, aScrollAreaSize.y, aScrollAreaSize.height, hSize.height, aOnTop, aAdd);
|
|
mInner.mHasHorizontalScrollbar = hasHorizontalScrollbar; // because mHasHorizontalScrollbar is a PRPackedBool
|
|
if (!fit)
|
|
mInner.SetScrollbarVisibility(mInner.mHScrollbarBox, !aAdd);
|
|
|
|
return fit;
|
|
} else {
|
|
if (mInner.mNeverHasVerticalScrollbar || !mInner.mVScrollbarBox)
|
|
return PR_FALSE;
|
|
|
|
nsSize vSize = mInner.mVScrollbarBox->GetPrefSize(aState);
|
|
nsBox::AddMargin(mInner.mVScrollbarBox, vSize);
|
|
|
|
mInner.SetScrollbarVisibility(mInner.mVScrollbarBox, aAdd);
|
|
|
|
PRBool hasVerticalScrollbar;
|
|
PRBool fit = AddRemoveScrollbar(hasVerticalScrollbar, aScrollAreaSize.x, aScrollAreaSize.width, vSize.width, aOnTop, aAdd);
|
|
mInner.mHasVerticalScrollbar = hasVerticalScrollbar; // because mHasVerticalScrollbar is a PRPackedBool
|
|
if (!fit)
|
|
mInner.SetScrollbarVisibility(mInner.mVScrollbarBox, !aAdd);
|
|
|
|
return fit;
|
|
}
|
|
}
|
|
|
|
PRBool
|
|
nsXULScrollFrame::AddRemoveScrollbar(PRBool& aHasScrollbar, nscoord& aXY,
|
|
nscoord& aSize, nscoord aSbSize,
|
|
PRBool aRightOrBottom, PRBool aAdd)
|
|
{
|
|
nscoord size = aSize;
|
|
nscoord xy = aXY;
|
|
|
|
if (size != NS_INTRINSICSIZE) {
|
|
if (aAdd) {
|
|
size -= aSbSize;
|
|
if (!aRightOrBottom && size >= 0)
|
|
xy += aSbSize;
|
|
} else {
|
|
size += aSbSize;
|
|
if (!aRightOrBottom)
|
|
xy -= aSbSize;
|
|
}
|
|
}
|
|
|
|
// not enough room? Yes? Return true.
|
|
if (size >= 0) {
|
|
aHasScrollbar = aAdd;
|
|
aSize = size;
|
|
aXY = xy;
|
|
return PR_TRUE;
|
|
}
|
|
|
|
aHasScrollbar = PR_FALSE;
|
|
return PR_FALSE;
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::LayoutScrollArea(nsBoxLayoutState& aState, const nsRect& aRect)
|
|
{
|
|
nsIView* scrollView = mInner.mScrollableView->View();
|
|
nsIViewManager* vm = scrollView->GetViewManager();
|
|
vm->MoveViewTo(scrollView, aRect.x, aRect.y);
|
|
vm->ResizeView(scrollView, nsRect(nsPoint(0, 0), aRect.Size()), PR_TRUE);
|
|
|
|
PRUint32 oldflags = aState.LayoutFlags();
|
|
nsPoint childOffset =
|
|
mInner.mScrolledFrame->GetView()->GetOffsetTo(GetView());
|
|
nsRect childRect = nsRect(childOffset, aRect.Size());
|
|
|
|
PRInt32 flags = NS_FRAME_NO_MOVE_VIEW;
|
|
|
|
nsSize minSize = mInner.mScrolledFrame->GetMinSize(aState);
|
|
|
|
if (minSize.height > childRect.height)
|
|
childRect.height = minSize.height;
|
|
|
|
if (minSize.width > childRect.width)
|
|
childRect.width = minSize.width;
|
|
|
|
aState.SetLayoutFlags(flags);
|
|
mInner.mScrolledFrame->SetBounds(aState, childRect);
|
|
mInner.mScrolledFrame->Layout(aState);
|
|
|
|
childRect = mInner.mScrolledFrame->GetRect();
|
|
|
|
if (childRect.width < aRect.width || childRect.height < aRect.height)
|
|
{
|
|
childRect.width = PR_MAX(childRect.width, aRect.width);
|
|
childRect.height = PR_MAX(childRect.height, aRect.height);
|
|
|
|
// remove overflow area when we update the bounds,
|
|
// because we've already accounted for it
|
|
mInner.mScrolledFrame->SetBounds(aState, childRect);
|
|
PresContext()->PropertyTable()->
|
|
DeleteProperty(mInner.mScrolledFrame, nsGkAtoms::overflowAreaProperty);
|
|
mInner.mScrolledFrame->RemoveStateBits(NS_FRAME_OUTSIDE_CHILDREN);
|
|
}
|
|
|
|
aState.SetLayoutFlags(oldflags);
|
|
|
|
}
|
|
|
|
void nsGfxScrollFrameInner::PostOverflowEvent()
|
|
{
|
|
if (mAsyncScrollPortEvent.IsPending())
|
|
return;
|
|
|
|
// Keep this in sync with FireScrollPortEvent().
|
|
nsSize scrollportSize = GetScrollPortSize();
|
|
nsSize childSize = GetScrolledRect(scrollportSize).Size();
|
|
|
|
PRBool newVerticalOverflow = childSize.height > scrollportSize.height;
|
|
PRBool vertChanged = mVerticalOverflow != newVerticalOverflow;
|
|
|
|
PRBool newHorizontalOverflow = childSize.width > scrollportSize.width;
|
|
PRBool horizChanged = mHorizontalOverflow != newHorizontalOverflow;
|
|
|
|
if (!vertChanged && !horizChanged) {
|
|
return;
|
|
}
|
|
|
|
nsRefPtr<AsyncScrollPortEvent> ev = new AsyncScrollPortEvent(this);
|
|
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev)))
|
|
mAsyncScrollPortEvent = ev;
|
|
}
|
|
|
|
PRBool
|
|
nsGfxScrollFrameInner::IsLTR() const
|
|
{
|
|
//TODO make bidi code set these from preferences
|
|
|
|
nsIFrame *frame = mOuter;
|
|
// XXX This is a bit on the slow side.
|
|
if (mIsRoot) {
|
|
// If we're the root scrollframe, we need the root element's style data.
|
|
nsPresContext *presContext = mOuter->PresContext();
|
|
nsIDocument *document = presContext->Document();
|
|
nsIContent *root = document->GetRootContent();
|
|
|
|
// But for HTML we want the body element.
|
|
nsCOMPtr<nsIDOMHTMLDocument> htmlDoc = do_QueryInterface(document);
|
|
if (htmlDoc && !document->IsCaseSensitive()) { // HTML, not XHTML
|
|
nsCOMPtr<nsIDOMHTMLElement> body;
|
|
htmlDoc->GetBody(getter_AddRefs(body));
|
|
nsCOMPtr<nsIContent> bodyContent = do_QueryInterface(body);
|
|
if (bodyContent)
|
|
root = bodyContent; // we can trust the document to hold on to it
|
|
}
|
|
|
|
if (root) {
|
|
nsIFrame *rootsFrame =
|
|
presContext->PresShell()->GetPrimaryFrameFor(root);
|
|
if (rootsFrame)
|
|
frame = rootsFrame;
|
|
}
|
|
}
|
|
|
|
return frame->GetStyleVisibility()->mDirection != NS_STYLE_DIRECTION_RTL;
|
|
}
|
|
|
|
PRBool
|
|
nsGfxScrollFrameInner::IsScrollbarOnRight() const
|
|
{
|
|
nsPresContext *presContext = mOuter->PresContext();
|
|
switch (presContext->GetCachedIntPref(kPresContext_ScrollbarSide)) {
|
|
default:
|
|
case 0: // UI directionality
|
|
return presContext->GetCachedIntPref(kPresContext_BidiDirection)
|
|
== IBMBIDI_TEXTDIRECTION_LTR;
|
|
case 1: // Document / content directionality
|
|
return IsLTR();
|
|
case 2: // Always right
|
|
return PR_TRUE;
|
|
case 3: // Always left
|
|
return PR_FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reflow the scroll area if it needs it and return its size. Also determine if the reflow will
|
|
* cause any of the scrollbars to need to be reflowed.
|
|
*/
|
|
nsresult
|
|
nsXULScrollFrame::Layout(nsBoxLayoutState& aState)
|
|
{
|
|
PRBool scrollbarRight = mInner.IsScrollbarOnRight();
|
|
PRBool scrollbarBottom = PR_TRUE;
|
|
|
|
// get the content rect
|
|
nsRect clientRect(0,0,0,0);
|
|
GetClientRect(clientRect);
|
|
|
|
// the scroll area size starts off as big as our content area
|
|
nsRect scrollAreaRect(clientRect);
|
|
|
|
/**************
|
|
Our basic strategy here is to first try laying out the content with
|
|
the scrollbars in their current state. We're hoping that that will
|
|
just "work"; the content will overflow wherever there's a scrollbar
|
|
already visible. If that does work, then there's no need to lay out
|
|
the scrollarea. Otherwise we fix up the scrollbars; first we add a
|
|
vertical one to scroll the content if necessary, or remove it if
|
|
it's not needed. Then we reflow the content if the scrollbar
|
|
changed. Then we add a horizontal scrollbar if necessary (or
|
|
remove if not needed), and if that changed, we reflow the content
|
|
again. At this point, any scrollbars that are needed to scroll the
|
|
content have been added.
|
|
|
|
In the second phase we check to see if any scrollbars are too small
|
|
to display, and if so, we remove them. We check the horizontal
|
|
scrollbar first; removing it might make room for the vertical
|
|
scrollbar, and if we have room for just one scrollbar we'll save
|
|
the vertical one.
|
|
|
|
Finally we position and size the scrollbars and scrollcorner (the
|
|
square that is needed in the corner of the window when two
|
|
scrollbars are visible), and reflow any fixed position views
|
|
(if we're the viewport and we added or removed a scrollbar).
|
|
**************/
|
|
|
|
ScrollbarStyles styles = GetScrollbarStyles();
|
|
|
|
// Look at our style do we always have vertical or horizontal scrollbars?
|
|
if (styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL)
|
|
mInner.mHasHorizontalScrollbar = PR_TRUE;
|
|
if (styles.mVertical == NS_STYLE_OVERFLOW_SCROLL)
|
|
mInner.mHasVerticalScrollbar = PR_TRUE;
|
|
|
|
if (mInner.mHasHorizontalScrollbar)
|
|
AddHorizontalScrollbar(aState, scrollAreaRect, scrollbarBottom);
|
|
|
|
if (mInner.mHasVerticalScrollbar)
|
|
AddVerticalScrollbar(aState, scrollAreaRect, scrollbarRight);
|
|
|
|
nsRect oldScrollAreaBounds = mInner.mScrollableView->View()->GetBounds();
|
|
|
|
// layout our the scroll area
|
|
LayoutScrollArea(aState, scrollAreaRect);
|
|
|
|
// now look at the content area and see if we need scrollbars or not
|
|
PRBool needsLayout = PR_FALSE;
|
|
|
|
// if we have 'auto' scrollbars look at the vertical case
|
|
if (styles.mVertical != NS_STYLE_OVERFLOW_SCROLL) {
|
|
// These are only good until the call to LayoutScrollArea.
|
|
nsRect scrolledRect = mInner.GetScrolledRect(scrollAreaRect.Size());
|
|
nsSize scrolledContentSize(scrolledRect.XMost(), scrolledRect.YMost());
|
|
|
|
// There are two cases to consider
|
|
if (scrolledContentSize.height <= scrollAreaRect.height
|
|
|| styles.mVertical != NS_STYLE_OVERFLOW_AUTO) {
|
|
if (mInner.mHasVerticalScrollbar) {
|
|
// We left room for the vertical scrollbar, but it's not needed;
|
|
// remove it.
|
|
RemoveVerticalScrollbar(aState, scrollAreaRect, scrollbarRight);
|
|
needsLayout = PR_TRUE;
|
|
}
|
|
} else {
|
|
if (!mInner.mHasVerticalScrollbar) {
|
|
// We didn't leave room for the vertical scrollbar, but it turns
|
|
// out we needed it
|
|
if (AddVerticalScrollbar(aState, scrollAreaRect, scrollbarRight))
|
|
needsLayout = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
// ok layout at the right size
|
|
if (needsLayout) {
|
|
nsBoxLayoutState resizeState(aState);
|
|
LayoutScrollArea(resizeState, scrollAreaRect);
|
|
needsLayout = PR_FALSE;
|
|
}
|
|
}
|
|
|
|
|
|
// if scrollbars are auto look at the horizontal case
|
|
if (styles.mHorizontal != NS_STYLE_OVERFLOW_SCROLL)
|
|
{
|
|
// These are only good until the call to LayoutScrollArea.
|
|
nsRect scrolledRect = mInner.GetScrolledRect(scrollAreaRect.Size());
|
|
nsSize scrolledContentSize(scrolledRect.XMost(), scrolledRect.YMost());
|
|
|
|
// if the child is wider that the scroll area
|
|
// and we don't have a scrollbar add one.
|
|
if (scrolledContentSize.width > scrollAreaRect.width
|
|
&& styles.mHorizontal == NS_STYLE_OVERFLOW_AUTO) {
|
|
|
|
if (!mInner.mHasHorizontalScrollbar) {
|
|
// no scrollbar?
|
|
if (AddHorizontalScrollbar(aState, scrollAreaRect, scrollbarBottom))
|
|
needsLayout = PR_TRUE;
|
|
|
|
// if we added a horizonal scrollbar and we did not have a vertical
|
|
// there is a chance that by adding the horizonal scrollbar we will
|
|
// suddenly need a vertical scrollbar. Is a special case but its
|
|
// important.
|
|
//if (!mHasVerticalScrollbar && scrolledContentSize.height > scrollAreaRect.height - sbSize.height)
|
|
// printf("****Gfx Scrollbar Special case hit!!*****\n");
|
|
|
|
}
|
|
} else {
|
|
// if the area is smaller or equal to and we have a scrollbar then
|
|
// remove it.
|
|
if (mInner.mHasHorizontalScrollbar) {
|
|
RemoveHorizontalScrollbar(aState, scrollAreaRect, scrollbarBottom);
|
|
needsLayout = PR_TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
// we only need to set the rect. The inner child stays the same size.
|
|
if (needsLayout) {
|
|
nsBoxLayoutState resizeState(aState);
|
|
LayoutScrollArea(resizeState, scrollAreaRect);
|
|
needsLayout = PR_FALSE;
|
|
}
|
|
|
|
// get the preferred size of the scrollbars
|
|
nsSize hMinSize(0, 0);
|
|
if (mInner.mHScrollbarBox && mInner.mHasHorizontalScrollbar) {
|
|
GetScrollbarMetrics(aState, mInner.mHScrollbarBox, &hMinSize, nsnull, PR_FALSE);
|
|
}
|
|
nsSize vMinSize(0, 0);
|
|
if (mInner.mVScrollbarBox && mInner.mHasVerticalScrollbar) {
|
|
GetScrollbarMetrics(aState, mInner.mVScrollbarBox, &vMinSize, nsnull, PR_TRUE);
|
|
}
|
|
|
|
// Disable scrollbars that are too small
|
|
// Disable horizontal scrollbar first. If we have to disable only one
|
|
// scrollbar, we'd rather keep the vertical scrollbar.
|
|
// Note that we always give horizontal scrollbars their preferred height,
|
|
// never their min-height. So check that there's room for the preferred height.
|
|
if (mInner.mHasHorizontalScrollbar &&
|
|
(hMinSize.width > clientRect.width - vMinSize.width
|
|
|| hMinSize.height > clientRect.height)) {
|
|
RemoveHorizontalScrollbar(aState, scrollAreaRect, scrollbarBottom);
|
|
needsLayout = PR_TRUE;
|
|
}
|
|
// Now disable vertical scrollbar if necessary
|
|
if (mInner.mHasVerticalScrollbar &&
|
|
(vMinSize.height > clientRect.height - hMinSize.height
|
|
|| vMinSize.width > clientRect.width)) {
|
|
RemoveVerticalScrollbar(aState, scrollAreaRect, scrollbarRight);
|
|
needsLayout = PR_TRUE;
|
|
}
|
|
|
|
// we only need to set the rect. The inner child stays the same size.
|
|
if (needsLayout) {
|
|
nsBoxLayoutState resizeState(aState);
|
|
LayoutScrollArea(resizeState, scrollAreaRect);
|
|
}
|
|
|
|
if (!mInner.mSupppressScrollbarUpdate) {
|
|
mInner.LayoutScrollbars(aState, clientRect, oldScrollAreaBounds, scrollAreaRect);
|
|
}
|
|
mInner.ScrollToRestoredPosition();
|
|
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
|
|
mInner.mHadNonInitialReflow = PR_TRUE;
|
|
}
|
|
|
|
mInner.PostOverflowEvent();
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::FinishReflowForScrollbar(nsIContent* aContent,
|
|
nscoord aMinXY, nscoord aMaxXY,
|
|
nscoord aCurPosXY,
|
|
nscoord aPageIncrement,
|
|
nscoord aIncrement)
|
|
{
|
|
// Scrollbars assume zero is the minimum position, so translate for them.
|
|
SetCoordAttribute(aContent, nsGkAtoms::curpos, aCurPosXY - aMinXY);
|
|
SetScrollbarEnabled(aContent, aMaxXY - aMinXY);
|
|
SetCoordAttribute(aContent, nsGkAtoms::maxpos, aMaxXY - aMinXY);
|
|
SetCoordAttribute(aContent, nsGkAtoms::pageincrement, aPageIncrement);
|
|
SetCoordAttribute(aContent, nsGkAtoms::increment, aIncrement);
|
|
}
|
|
|
|
PRBool
|
|
nsGfxScrollFrameInner::ReflowFinished()
|
|
{
|
|
mPostedReflowCallback = PR_FALSE;
|
|
|
|
// Update scrollbar attributes.
|
|
nsPresContext* presContext = mOuter->PresContext();
|
|
|
|
nsIScrollableView* scrollable = GetScrollableView();
|
|
nsRect scrollArea = scrollable->View()->GetBounds();
|
|
|
|
const nsStyleFont* font = mOuter->GetStyleFont();
|
|
const nsFont& f = font->mFont;
|
|
nsCOMPtr<nsIFontMetrics> fm = presContext->GetMetricsFor(f);
|
|
nscoord fontHeight = 1;
|
|
NS_ASSERTION(fm,"FontMetrics is null assuming fontHeight == 1");
|
|
if (fm)
|
|
fm->GetHeight(fontHeight);
|
|
scrollable->SetLineHeight(fontHeight);
|
|
|
|
nsRect scrolledContentRect = GetScrolledRect(scrollArea.Size());
|
|
nscoord minX = scrolledContentRect.x;
|
|
nscoord maxX = scrolledContentRect.XMost() - scrollArea.width;
|
|
nscoord minY = scrolledContentRect.y;
|
|
nscoord maxY = scrolledContentRect.YMost() - scrollArea.height;
|
|
|
|
// Suppress handling of the curpos attribute changes we make here.
|
|
NS_ASSERTION(!mFrameInitiatedScroll, "We shouldn't be reentering here");
|
|
mFrameInitiatedScroll = PR_TRUE;
|
|
|
|
nsCOMPtr<nsIContent> vScroll =
|
|
mVScrollbarBox ? mVScrollbarBox->GetContent() : nsnull;
|
|
nsCOMPtr<nsIContent> hScroll =
|
|
mHScrollbarBox ? mHScrollbarBox->GetContent() : nsnull;
|
|
|
|
// Note, in some cases mOuter may get deleted while finishing reflow
|
|
// for scrollbars.
|
|
if (vScroll || hScroll) {
|
|
nsWeakFrame weakFrame(mOuter);
|
|
nscoord curPosX, curPosY;
|
|
scrollable->GetScrollPosition(curPosX, curPosY);
|
|
if (vScroll) {
|
|
FinishReflowForScrollbar(vScroll, minY, maxY, curPosY,
|
|
nscoord(scrollArea.height - fontHeight),
|
|
fontHeight);
|
|
}
|
|
if (hScroll) {
|
|
FinishReflowForScrollbar(hScroll, minX, maxX, curPosX,
|
|
nscoord(float(scrollArea.width) * 0.8),
|
|
nsPresContext::CSSPixelsToAppUnits(10));
|
|
}
|
|
NS_ENSURE_TRUE(weakFrame.IsAlive(), PR_FALSE);
|
|
}
|
|
|
|
mFrameInitiatedScroll = PR_FALSE;
|
|
// We used to rely on the curpos attribute changes above to scroll the
|
|
// view. However, for scrolling to the left of the viewport, we
|
|
// rescale the curpos attribute, which means that operations like
|
|
// resizing the window while it is scrolled all the way to the left
|
|
// hold the curpos attribute constant at 0 while still requiring
|
|
// scrolling. So we suppress the effect of the changes above with
|
|
// mFrameInitiatedScroll and call CurPosAttributeChanged here.
|
|
// (It actually even works some of the time without this, thanks to
|
|
// nsSliderFrame::AttributeChanged's handling of maxpos, but not when
|
|
// we hide the scrollbar on a large size change, such as
|
|
// maximization.)
|
|
if (!mHScrollbarBox && !mVScrollbarBox)
|
|
return PR_FALSE;
|
|
CurPosAttributeChanged(mVScrollbarBox ? mVScrollbarBox->GetContent()
|
|
: mHScrollbarBox->GetContent());
|
|
return PR_TRUE;
|
|
}
|
|
|
|
static void LayoutAndInvalidate(nsBoxLayoutState& aState,
|
|
nsIFrame* aBox, const nsRect& aRect)
|
|
{
|
|
// When a child box changes shape of position, the parent
|
|
// is responsible for invalidation; the overflow rect must be invalidated
|
|
// to make sure to catch any overflow
|
|
PRBool rectChanged = aBox->GetRect() != aRect;
|
|
if (rectChanged)
|
|
aBox->Invalidate(aBox->GetOverflowRect());
|
|
nsBoxFrame::LayoutChildAt(aState, aBox, aRect);
|
|
if (rectChanged)
|
|
aBox->Invalidate(aBox->GetOverflowRect());
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::LayoutScrollbars(nsBoxLayoutState& aState,
|
|
const nsRect& aContentArea,
|
|
const nsRect& aOldScrollArea,
|
|
const nsRect& aScrollArea)
|
|
{
|
|
NS_ASSERTION(!mSupppressScrollbarUpdate,
|
|
"This should have been suppressed");
|
|
|
|
if (mVScrollbarBox) {
|
|
NS_PRECONDITION(mVScrollbarBox->IsBoxFrame(), "Must be a box frame!");
|
|
nsRect vRect(aScrollArea);
|
|
vRect.width = aContentArea.width - aScrollArea.width;
|
|
vRect.x = IsScrollbarOnRight() ? aScrollArea.XMost() : aContentArea.x;
|
|
nsMargin margin;
|
|
mVScrollbarBox->GetMargin(margin);
|
|
vRect.Deflate(margin);
|
|
LayoutAndInvalidate(aState, mVScrollbarBox, vRect);
|
|
}
|
|
|
|
if (mHScrollbarBox) {
|
|
NS_PRECONDITION(mHScrollbarBox->IsBoxFrame(), "Must be a box frame!");
|
|
nsRect hRect(aScrollArea);
|
|
hRect.height = aContentArea.height - aScrollArea.height;
|
|
hRect.y = PR_TRUE ? aScrollArea.YMost() : aContentArea.y;
|
|
nsMargin margin;
|
|
mHScrollbarBox->GetMargin(margin);
|
|
hRect.Deflate(margin);
|
|
LayoutAndInvalidate(aState, mHScrollbarBox, hRect);
|
|
}
|
|
|
|
// place the scrollcorner
|
|
if (mScrollCornerBox) {
|
|
NS_PRECONDITION(mScrollCornerBox->IsBoxFrame(), "Must be a box frame!");
|
|
nsRect r(0, 0, 0, 0);
|
|
if (aContentArea.x != aScrollArea.x) {
|
|
// scrollbar (if any) on left
|
|
r.x = aContentArea.x;
|
|
r.width = aScrollArea.x - aContentArea.x;
|
|
NS_ASSERTION(r.width >= 0, "Scroll area should be inside client rect");
|
|
} else {
|
|
// scrollbar (if any) on right
|
|
r.x = aScrollArea.XMost();
|
|
r.width = aContentArea.XMost() - aScrollArea.XMost();
|
|
NS_ASSERTION(r.width >= 0, "Scroll area should be inside client rect");
|
|
}
|
|
if (aContentArea.y != aScrollArea.y) {
|
|
// scrollbar (if any) on top
|
|
r.y = aContentArea.y;
|
|
r.height = aScrollArea.y - aContentArea.y;
|
|
NS_ASSERTION(r.height >= 0, "Scroll area should be inside client rect");
|
|
} else {
|
|
// scrollbar (if any) on bottom
|
|
r.y = aScrollArea.YMost();
|
|
r.height = aContentArea.YMost() - aScrollArea.YMost();
|
|
NS_ASSERTION(r.height >= 0, "Scroll area should be inside client rect");
|
|
}
|
|
LayoutAndInvalidate(aState, mScrollCornerBox, r);
|
|
}
|
|
|
|
// may need to update fixed position children of the viewport,
|
|
// if the client area changed size because of an incremental
|
|
// reflow of a descendant. (If the outer frame is dirty, the fixed
|
|
// children will be re-laid out anyway)
|
|
if (aOldScrollArea.Size() != aScrollArea.Size() &&
|
|
!(mOuter->GetStateBits() & NS_FRAME_IS_DIRTY) &&
|
|
mIsRoot) {
|
|
nsIFrame* parentFrame = mOuter->GetParent();
|
|
for (nsIFrame *fixedChild =
|
|
parentFrame->GetFirstChild(nsGkAtoms::fixedList);
|
|
fixedChild; fixedChild = fixedChild->GetNextSibling()) {
|
|
// force a reflow of the fixed child
|
|
// XXX Will this work given where we currently are in reflow?
|
|
aState.PresContext()->PresShell()->
|
|
FrameNeedsReflow(fixedChild, nsIPresShell::eResize,
|
|
NS_FRAME_HAS_DIRTY_CHILDREN);
|
|
}
|
|
}
|
|
|
|
// post reflow callback to modify scrollbar attributes
|
|
if (!mPostedReflowCallback) {
|
|
aState.PresContext()->PresShell()->PostReflowCallback(this);
|
|
mPostedReflowCallback = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::ScrollbarChanged(nsPresContext* aPresContext, nscoord aX, nscoord aY, PRUint32 aFlags)
|
|
{
|
|
nsIScrollableView* scrollable = GetScrollableView();
|
|
scrollable->ScrollTo(aX, aY, aFlags);
|
|
// printf("scrolling to: %d, %d\n", aX, aY);
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::SetScrollbarEnabled(nsIContent* aContent, nscoord aMaxPos)
|
|
{
|
|
if (aMaxPos) {
|
|
aContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::disabled, PR_TRUE);
|
|
} else {
|
|
aContent->SetAttr(kNameSpaceID_None, nsGkAtoms::disabled,
|
|
NS_LITERAL_STRING("true"), PR_TRUE);
|
|
}
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::SetCoordAttribute(nsIContent* aContent, nsIAtom* aAtom,
|
|
nscoord aSize)
|
|
{
|
|
// convert to pixels
|
|
aSize = nsPresContext::AppUnitsToIntCSSPixels(aSize);
|
|
|
|
// only set the attribute if it changed.
|
|
|
|
nsAutoString newValue;
|
|
newValue.AppendInt(aSize);
|
|
|
|
if (aContent->AttrValueIs(kNameSpaceID_None, aAtom, newValue, eCaseMatters))
|
|
return;
|
|
|
|
aContent->SetAttr(kNameSpaceID_None, aAtom, newValue, PR_TRUE);
|
|
}
|
|
|
|
nsRect
|
|
nsGfxScrollFrameInner::GetScrolledRect(const nsSize& aScrollPortSize) const
|
|
{
|
|
nsRect result = mScrolledFrame->GetOverflowRect();
|
|
nscoord x1 = result.x, x2 = result.XMost(),
|
|
y1 = result.y, y2 = result.YMost();
|
|
if (y1 < 0)
|
|
y1 = 0;
|
|
if (IsLTR() || mIsXUL) {
|
|
if (x1 < 0)
|
|
x1 = 0;
|
|
} else {
|
|
if (x2 > aScrollPortSize.width)
|
|
x2 = aScrollPortSize.width;
|
|
}
|
|
|
|
return nsRect(x1, y1, x2 - x1, y2 - y1);
|
|
}
|
|
|
|
nsMargin
|
|
nsGfxScrollFrameInner::GetActualScrollbarSizes() const {
|
|
nsMargin border;
|
|
mOuter->GetBorder(border);
|
|
nsRect r(nsPoint(0,0), mOuter->GetSize());
|
|
r.Deflate(border);
|
|
nsRect scrollArea = mScrollableView->View()->GetBounds();
|
|
|
|
return nsMargin(scrollArea.x - r.x, scrollArea.y - r.y,
|
|
r.XMost() - scrollArea.XMost(),
|
|
r.YMost() - scrollArea.YMost());
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::SetScrollbarVisibility(nsIBox* aScrollbar, PRBool aVisible)
|
|
{
|
|
if (!aScrollbar)
|
|
return;
|
|
|
|
nsIScrollbarFrame* scrollbar;
|
|
CallQueryInterface(aScrollbar, &scrollbar);
|
|
if (scrollbar) {
|
|
// See if we have a mediator.
|
|
nsIScrollbarMediator* mediator = scrollbar->GetScrollbarMediator();
|
|
if (mediator) {
|
|
// Inform the mediator of the visibility change.
|
|
mediator->VisibilityChanged(scrollbar, aVisible);
|
|
}
|
|
}
|
|
}
|
|
|
|
PRInt32
|
|
nsGfxScrollFrameInner::GetCoordAttribute(nsIBox* aBox, nsIAtom* atom, PRInt32 defaultValue)
|
|
{
|
|
if (aBox) {
|
|
nsIContent* content = aBox->GetContent();
|
|
|
|
nsAutoString value;
|
|
content->GetAttr(kNameSpaceID_None, atom, value);
|
|
if (!value.IsEmpty())
|
|
{
|
|
PRInt32 error;
|
|
|
|
// convert it to an integer
|
|
defaultValue = nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
|
|
}
|
|
}
|
|
|
|
return defaultValue;
|
|
}
|
|
|
|
static nsIURI* GetDocURI(nsIFrame* aFrame)
|
|
{
|
|
nsIPresShell* shell = aFrame->PresContext()->GetPresShell();
|
|
if (!shell)
|
|
return nsnull;
|
|
nsIDocument* doc = shell->GetDocument();
|
|
if (!doc)
|
|
return nsnull;
|
|
return doc->GetDocumentURI();
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::SaveVScrollbarStateToGlobalHistory()
|
|
{
|
|
NS_ASSERTION(mIsRoot, "Only use this on viewports");
|
|
|
|
// If the hint is the same as the one we loaded, don't bother
|
|
// saving it
|
|
if (mDidLoadHistoryVScrollbarHint &&
|
|
(mHistoryVScrollbarHint == mHasVerticalScrollbar))
|
|
return;
|
|
|
|
nsIURI* uri = GetDocURI(mOuter);
|
|
if (!uri)
|
|
return;
|
|
|
|
nsCOMPtr<nsIGlobalHistory3> history(do_GetService(NS_GLOBALHISTORY2_CONTRACTID));
|
|
if (!history)
|
|
return;
|
|
|
|
PRUint32 flags = 0;
|
|
if (mHasVerticalScrollbar) {
|
|
flags |= NS_GECKO_FLAG_NEEDS_VERTICAL_SCROLLBAR;
|
|
}
|
|
history->SetURIGeckoFlags(uri, flags);
|
|
// if it fails, we don't care
|
|
}
|
|
|
|
nsresult
|
|
nsGfxScrollFrameInner::GetVScrollbarHintFromGlobalHistory(PRBool* aVScrollbarNeeded)
|
|
{
|
|
NS_ASSERTION(mIsRoot, "Only use this on viewports");
|
|
NS_ASSERTION(!mDidLoadHistoryVScrollbarHint,
|
|
"Should only load a hint once, it can be expensive");
|
|
|
|
nsIURI* uri = GetDocURI(mOuter);
|
|
if (!uri)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
nsCOMPtr<nsIGlobalHistory3> history(do_GetService(NS_GLOBALHISTORY2_CONTRACTID));
|
|
if (!history)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
PRUint32 flags;
|
|
nsresult rv = history->GetURIGeckoFlags(uri, &flags);
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
*aVScrollbarNeeded = (flags & NS_GECKO_FLAG_NEEDS_VERTICAL_SCROLLBAR) != 0;
|
|
mDidLoadHistoryVScrollbarHint = PR_TRUE;
|
|
mHistoryVScrollbarHint = *aVScrollbarNeeded;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsPresState*
|
|
nsGfxScrollFrameInner::SaveState(nsIStatefulFrame::SpecialStateID aStateID)
|
|
{
|
|
// Don't save "normal" state for the root scrollframe; that's
|
|
// handled via the eDocumentScrollState state id
|
|
if (mIsRoot && aStateID == nsIStatefulFrame::eNoID) {
|
|
return nsnull;
|
|
}
|
|
|
|
nsIScrollbarMediator* mediator;
|
|
CallQueryInterface(GetScrolledFrame(), &mediator);
|
|
if (mediator) {
|
|
// child handles its own scroll state, so don't bother saving state here
|
|
return nsnull;
|
|
}
|
|
|
|
nsIScrollableView* scrollingView = GetScrollableView();
|
|
PRInt32 x,y;
|
|
scrollingView->GetScrollPosition(x,y);
|
|
// Don't save scroll position if we are at (0,0)
|
|
if (!x && !y) {
|
|
return nsnull;
|
|
}
|
|
|
|
nsIView* child = nsnull;
|
|
scrollingView->GetScrolledView(child);
|
|
if (!child) {
|
|
return nsnull;
|
|
}
|
|
|
|
nsRect childRect = child->GetBounds();
|
|
childRect.x = x;
|
|
childRect.y = y;
|
|
nsAutoPtr<nsPresState> state;
|
|
nsresult rv = NS_NewPresState(getter_Transfers(state));
|
|
NS_ENSURE_SUCCESS(rv, nsnull);
|
|
|
|
state->SetScrollState(childRect);
|
|
|
|
return state.forget();
|
|
}
|
|
|
|
void
|
|
nsGfxScrollFrameInner::RestoreState(nsPresState* aState)
|
|
{
|
|
mRestoreRect = aState->GetScrollState();
|
|
mLastPos.x = -1;
|
|
mLastPos.y = -1;
|
|
mDidHistoryRestore = PR_TRUE;
|
|
nsIScrollableView* scrollingView = GetScrollableView();
|
|
if (scrollingView) {
|
|
scrollingView->GetScrollPosition(mLastPos.x, mLastPos.y);
|
|
} else {
|
|
mLastPos = nsPoint(0, 0);
|
|
}
|
|
}
|