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https://github.com/mozilla/gecko-dev.git
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618 lines
22 KiB
C++
618 lines
22 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsCOMPtr.h"
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#include "nsContainerFrame.h"
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#include "nsHTMLParts.h"
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#include "nsHTMLIIDs.h"
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#include "nsLayoutAtoms.h"
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#include "nsIViewManager.h"
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#include "nsIScrollableView.h"
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#include "nsIDeviceContext.h"
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#include "nsIPresContext.h"
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#include "nsIReflowCommand.h"
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#include "nsIPresShell.h"
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static NS_DEFINE_IID(kIFrameIID, NS_IFRAME_IID);
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static NS_DEFINE_IID(kScrollViewIID, NS_ISCROLLABLEVIEW_IID);
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/**
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* Viewport frame class.
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*
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* The viewport frame is the parent frame for the document element's frame.
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* It only supports having a single child frame which must be one of the
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* following:
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* - scroll frame
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* - root frame
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*
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* The viewport frame has an additional named child list:
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* - "Fixed-list" which contains the fixed positioned frames
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*
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* @see nsLayoutAtoms::fixedList
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*/
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class ViewportFrame : public nsContainerFrame {
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public:
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NS_IMETHOD Destroy(nsIPresContext* aPresContext);
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NS_IMETHOD SetInitialChildList(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList);
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NS_IMETHOD GetFrameForPoint(nsIPresContext* aPresContext,
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const nsPoint& aPoint,
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nsFramePaintLayer aWhichLayer,
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nsIFrame** aFrame);
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NS_IMETHOD AppendFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aFrameList);
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NS_IMETHOD InsertFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList);
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NS_IMETHOD RemoveFrame(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aOldFrame);
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NS_IMETHOD GetAdditionalChildListName(PRInt32 aIndex,
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nsIAtom** aListName) const;
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NS_IMETHOD FirstChild(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame** aFirstChild) const;
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NS_IMETHOD Reflow(nsIPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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/**
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* Get the "type" of the frame
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*
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* @see nsLayoutAtoms::viewportFrame
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*/
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NS_IMETHOD GetFrameType(nsIAtom** aType) const;
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#ifdef DEBUG
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NS_IMETHOD GetFrameName(nsString& aResult) const;
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NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const;
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#endif
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protected:
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nsresult IncrementalReflow(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState);
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nsresult ReflowFixedFrame(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nsIFrame* aKidFrame,
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PRBool aInitialReflow,
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nsReflowStatus& aStatus) const;
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void ReflowFixedFrames(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState) const;
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void CalculateFixedContainingBlockSize(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord& aWidth,
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nscoord& aHeight) const;
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private:
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nsFrameList mFixedFrames; // additional named child list
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};
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//----------------------------------------------------------------------
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nsresult
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NS_NewViewportFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
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{
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NS_PRECONDITION(aNewFrame, "null OUT ptr");
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if (nsnull == aNewFrame) {
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return NS_ERROR_NULL_POINTER;
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}
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ViewportFrame* it = new (aPresShell) ViewportFrame;
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aNewFrame = it;
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return NS_OK;
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}
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NS_IMETHODIMP
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ViewportFrame::Destroy(nsIPresContext* aPresContext)
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{
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mFixedFrames.DestroyFrames(aPresContext);
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return nsContainerFrame::Destroy(aPresContext);
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}
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NS_IMETHODIMP
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ViewportFrame::SetInitialChildList(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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nsresult rv;
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// See which child list to add the frames to
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aChildList);
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#endif
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if (nsLayoutAtoms::fixedList == aListName) {
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mFixedFrames.SetFrames(aChildList);
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rv = NS_OK;
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} else {
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rv = nsContainerFrame::SetInitialChildList(aPresContext, aListName, aChildList);
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::GetFrameForPoint(nsIPresContext* aPresContext,
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const nsPoint& aPoint,
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nsFramePaintLayer aWhichLayer,
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nsIFrame** aFrame)
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{
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// this should act like a block, so we need to override
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return GetFrameForPointUsing(aPresContext, aPoint, nsnull, aWhichLayer, (aWhichLayer == NS_FRAME_PAINT_LAYER_BACKGROUND), aFrame);
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}
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NS_IMETHODIMP
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ViewportFrame::AppendFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aFrameList)
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{
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nsresult rv;
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NS_PRECONDITION(nsLayoutAtoms::fixedList == aListName, "unexpected child list");
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if (aListName != nsLayoutAtoms::fixedList) {
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// We only expect incremental changes for our fixed frames
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rv = NS_ERROR_INVALID_ARG;
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} else {
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// Add the frames to our list of fixed position frames
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aFrameList);
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#endif
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mFixedFrames.AppendFrames(nsnull, aFrameList);
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// Generate a reflow command to reflow the dirty frames
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nsIReflowCommand* reflowCmd;
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rv = NS_NewHTMLReflowCommand(&reflowCmd, this, nsIReflowCommand::ReflowDirty);
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if (NS_SUCCEEDED(rv)) {
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reflowCmd->SetChildListName(nsLayoutAtoms::fixedList);
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aPresShell.AppendReflowCommand(reflowCmd);
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NS_RELEASE(reflowCmd);
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}
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::InsertFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList)
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{
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nsresult rv;
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NS_PRECONDITION(nsLayoutAtoms::fixedList == aListName, "unexpected child list");
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if (aListName != nsLayoutAtoms::fixedList) {
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// We only expect incremental changes for our fixed frames
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rv = NS_ERROR_INVALID_ARG;
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} else {
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// Insert the new frames
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aFrameList);
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#endif
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mFixedFrames.InsertFrames(nsnull, aPrevFrame, aFrameList);
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// Generate a reflow command to reflow the dirty frames
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nsIReflowCommand* reflowCmd;
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rv = NS_NewHTMLReflowCommand(&reflowCmd, this, nsIReflowCommand::ReflowDirty);
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if (NS_SUCCEEDED(rv)) {
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reflowCmd->SetChildListName(nsLayoutAtoms::fixedList);
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aPresShell.AppendReflowCommand(reflowCmd);
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NS_RELEASE(reflowCmd);
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}
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::RemoveFrame(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aOldFrame)
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{
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nsresult rv;
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NS_PRECONDITION(nsLayoutAtoms::fixedList == aListName, "unexpected child list");
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if (aListName != nsLayoutAtoms::fixedList) {
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// We only expect incremental changes for our fixed frames
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rv = NS_ERROR_INVALID_ARG;
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} else {
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PRBool result = mFixedFrames.DestroyFrame(aPresContext, aOldFrame);
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NS_ASSERTION(result, "didn't find frame to delete");
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// Because fixed frames aren't part of a flow, there's no additional
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// work to do, e.g. reflowing sibling frames. And because fixed frames
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// have a view, we don't need to repaint
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rv = result ? NS_OK : NS_ERROR_FAILURE;
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::GetAdditionalChildListName(PRInt32 aIndex,
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nsIAtom** aListName) const
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{
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NS_PRECONDITION(nsnull != aListName, "null OUT parameter pointer");
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*aListName = nsnull;
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if (aIndex < 0) {
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return NS_ERROR_INVALID_ARG;
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} else if (0 == aIndex) {
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*aListName = nsLayoutAtoms::fixedList;
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NS_ADDREF(*aListName);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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ViewportFrame::FirstChild(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame** aFirstChild) const
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{
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NS_PRECONDITION(nsnull != aFirstChild, "null OUT parameter pointer");
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if (aListName == nsLayoutAtoms::fixedList) {
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*aFirstChild = mFixedFrames.FirstChild();
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return NS_OK;
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}
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return nsContainerFrame::FirstChild(aPresContext, aListName, aFirstChild);
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}
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void
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ViewportFrame::CalculateFixedContainingBlockSize(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord& aWidth,
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nscoord& aHeight) const
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{
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// Initialize the values to the computed width/height in our reflow
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// state struct
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aWidth = aReflowState.mComputedWidth;
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aHeight = aReflowState.mComputedHeight;
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// Get our prinicpal child frame and see if we're scrollable
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nsIFrame* kidFrame = mFrames.FirstChild();
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nsIView* kidView;
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kidFrame->GetView(aPresContext, &kidView);
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if (nsnull != kidView) {
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nsIScrollableView* scrollingView;
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if (NS_SUCCEEDED(kidView->QueryInterface(kScrollViewIID, (void**)&scrollingView))) {
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// Get the scrollbar dimensions
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float sbWidth, sbHeight;
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nsCOMPtr<nsIDeviceContext> dc;
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aPresContext->GetDeviceContext(getter_AddRefs(dc));
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dc->GetScrollBarDimensions(sbWidth, sbHeight);
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// See if the scrollbars are visible
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PRBool vertSBVisible, horzSBVisible;
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scrollingView->GetScrollbarVisibility(&vertSBVisible, &horzSBVisible);
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if (vertSBVisible) {
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aWidth -= NSToCoordRound(sbWidth);
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}
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if (horzSBVisible) {
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aHeight -= NSToCoordRound(sbHeight);
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}
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}
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}
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}
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nsresult
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ViewportFrame::ReflowFixedFrame(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nsIFrame* aKidFrame,
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PRBool aInitialReflow,
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nsReflowStatus& aStatus) const
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{
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// Reflow the frame
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nsresult rv;
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nsHTMLReflowMetrics kidDesiredSize(nsnull);
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nsSize availSize(aReflowState.availableWidth, NS_UNCONSTRAINEDSIZE);
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nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
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availSize);
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// If it's the initial reflow, then override the reflow reason. This is
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// used when frames are inserted incrementally
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if (aInitialReflow) {
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kidReflowState.reason = eReflowReason_Initial;
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}
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// Send the WillReflow() notification and position the frame
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aKidFrame->WillReflow(aPresContext);
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aKidFrame->MoveTo(aPresContext,
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kidReflowState.mComputedOffsets.left + kidReflowState.mComputedMargin.left,
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kidReflowState.mComputedOffsets.top + kidReflowState.mComputedMargin.top);
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// Position its view
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nsIView* kidView;
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aKidFrame->GetView(aPresContext, &kidView);
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nsContainerFrame::PositionFrameView(aPresContext, aKidFrame, kidView);
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// Do the reflow
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rv = aKidFrame->Reflow(aPresContext, kidDesiredSize, kidReflowState, aStatus);
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// XXX If the child had a fixed height, then make sure it respected it...
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if (NS_AUTOHEIGHT != kidReflowState.mComputedHeight) {
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if (kidDesiredSize.height < kidReflowState.mComputedHeight) {
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kidDesiredSize.height = kidReflowState.mComputedHeight;
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kidDesiredSize.height += kidReflowState.mComputedBorderPadding.top +
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kidReflowState.mComputedBorderPadding.bottom;
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}
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}
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// Position the child
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nsRect rect(kidReflowState.mComputedOffsets.left + kidReflowState.mComputedMargin.left,
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kidReflowState.mComputedOffsets.top + kidReflowState.mComputedMargin.top,
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kidDesiredSize.width, kidDesiredSize.height);
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aKidFrame->SetRect(aPresContext, rect);
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// Size and position the view and set its opacity, visibility, content
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// transparency, and clip
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nsContainerFrame::SyncFrameViewAfterReflow(aPresContext, aKidFrame, kidView,
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&kidDesiredSize.mOverflowArea);
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aKidFrame->DidReflow(aPresContext, NS_FRAME_REFLOW_FINISHED);
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return rv;
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}
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// Called by Reflow() to reflow all of the fixed positioned child frames.
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// This is only done for 'initial', 'resize', and 'style change' reflow commands
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void
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ViewportFrame::ReflowFixedFrames(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState) const
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{
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NS_PRECONDITION(eReflowReason_Incremental != aReflowState.reason,
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"unexpected reflow reason");
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// Calculate how much room is available for the fixed items. That means
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// determining if the viewport is scrollable and whether the vertical and/or
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// horizontal scrollbars are visible
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nscoord width, height;
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CalculateFixedContainingBlockSize(aPresContext, aReflowState, width, height);
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// Make a copy of the reflow state and change the computed width and height
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// to reflect the available space for the fixed items
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// XXX Find a cleaner way to do this...
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nsHTMLReflowState reflowState(aReflowState);
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reflowState.mComputedWidth = width;
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reflowState.mComputedHeight = height;
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nsIFrame* kidFrame;
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for (kidFrame = mFixedFrames.FirstChild(); nsnull != kidFrame; kidFrame->GetNextSibling(&kidFrame)) {
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// Reflow the frame using our reflow reason
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nsReflowStatus kidStatus;
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ReflowFixedFrame(aPresContext, reflowState, kidFrame, PR_FALSE, kidStatus);
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}
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}
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/**
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* Called by Reflow() to handle the case where it's an incremental reflow
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* of a fixed child frame
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*/
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nsresult
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ViewportFrame::IncrementalReflow(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState)
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{
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nsIReflowCommand::ReflowType type;
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// Get the type of reflow command
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aReflowState.reflowCommand->GetType(type);
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// The only type of reflow command we expect is that we have dirty
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// child frames to reflow
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NS_ASSERTION(nsIReflowCommand::ReflowDirty, "unexpected reflow type");
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// Calculate how much room is available for the fixed items. That means
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// determining if the viewport is scrollable and whether the vertical and/or
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// horizontal scrollbars are visible
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nscoord width, height;
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CalculateFixedContainingBlockSize(aPresContext, aReflowState, width, height);
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// Make a copy of the reflow state and change the computed width and height
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// to reflect the available space for the fixed items
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// XXX Find a cleaner way to do this...
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nsHTMLReflowState reflowState(aReflowState);
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reflowState.mComputedWidth = width;
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reflowState.mComputedHeight = height;
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// Walk the fixed child frames and reflow the dirty frames
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for (nsIFrame* f = mFixedFrames.FirstChild(); f; f->GetNextSibling(&f)) {
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nsFrameState frameState;
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f->GetFrameState(&frameState);
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if (frameState & NS_FRAME_IS_DIRTY) {
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nsReflowStatus status;
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// Note: the only reason the frame would be dirty would be if it had
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// just been inserted or appended
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NS_ASSERTION(frameState & NS_FRAME_FIRST_REFLOW, "unexpected frame state");
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ReflowFixedFrame(aPresContext, reflowState, f, PR_TRUE, status);
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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ViewportFrame::Reflow(nsIPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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DO_GLOBAL_REFLOW_COUNT("ViewportFrame", aReflowState.reason);
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NS_FRAME_TRACE_REFLOW_IN("ViewportFrame::Reflow");
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NS_PRECONDITION(nsnull == aDesiredSize.maxElementSize, "unexpected request");
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// Initialize OUT parameter
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aStatus = NS_FRAME_COMPLETE;
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nsIFrame* nextFrame = nsnull;
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PRBool isHandled = PR_FALSE;
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// Check for an incremental reflow
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if (eReflowReason_Incremental == aReflowState.reason) {
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// See if we're the target frame
|
|
nsIFrame* targetFrame;
|
|
aReflowState.reflowCommand->GetTarget(targetFrame);
|
|
if (this == targetFrame) {
|
|
nsIAtom* listName;
|
|
PRBool isFixedChild;
|
|
|
|
// It's targeted at us. It better be for the fixed child list
|
|
aReflowState.reflowCommand->GetChildListName(listName);
|
|
isFixedChild = nsLayoutAtoms::fixedList == listName;
|
|
NS_IF_RELEASE(listName);
|
|
NS_ASSERTION(isFixedChild, "unexpected child list");
|
|
|
|
if (isFixedChild) {
|
|
// Handle the incremental reflow command
|
|
IncrementalReflow(aPresContext, aReflowState);
|
|
isHandled = PR_TRUE;
|
|
}
|
|
|
|
} else {
|
|
// Get the next frame in the reflow chain
|
|
aReflowState.reflowCommand->GetNext(nextFrame);
|
|
}
|
|
}
|
|
|
|
nsRect kidRect(0,0,aReflowState.availableWidth,aReflowState.availableHeight);
|
|
|
|
if (!isHandled) {
|
|
if ((eReflowReason_Incremental == aReflowState.reason) &&
|
|
(mFixedFrames.ContainsFrame(nextFrame))) {
|
|
// Reflow the 'fixed' frame that's the next frame in the reflow path
|
|
nsReflowStatus kidStatus;
|
|
ReflowFixedFrame(aPresContext, aReflowState, nextFrame, PR_FALSE,
|
|
kidStatus);
|
|
|
|
} else {
|
|
// Reflow our one and only principal child frame
|
|
if (mFrames.NotEmpty()) {
|
|
nsIFrame* kidFrame = mFrames.FirstChild();
|
|
nsHTMLReflowMetrics kidDesiredSize(nsnull);
|
|
nsSize availableSpace(aReflowState.availableWidth,
|
|
aReflowState.availableHeight);
|
|
nsHTMLReflowState kidReflowState(aPresContext, aReflowState,
|
|
kidFrame, availableSpace);
|
|
|
|
// Reflow the frame
|
|
kidReflowState.mComputedHeight = aReflowState.availableHeight;
|
|
ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowState,
|
|
0, 0, 0, aStatus);
|
|
kidRect.width = kidDesiredSize.width;
|
|
kidRect.height = kidDesiredSize.height;
|
|
|
|
FinishReflowChild(kidFrame, aPresContext, kidDesiredSize, 0, 0, 0);
|
|
}
|
|
|
|
// If it's a 'initial', 'resize', or 'style change' reflow command (anything
|
|
// but incremental), then reflow all the fixed positioned child frames
|
|
if (eReflowReason_Incremental != aReflowState.reason) {
|
|
ReflowFixedFrames(aPresContext, aReflowState);
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we were flowed initially at both an unconstrained width and height,
|
|
// this is a hint that we should return our child's intrinsic size.
|
|
if ((eReflowReason_Initial == aReflowState.reason ||
|
|
eReflowReason_Resize == aReflowState.reason) &&
|
|
aReflowState.availableWidth == NS_UNCONSTRAINEDSIZE &&
|
|
aReflowState.availableHeight == NS_UNCONSTRAINEDSIZE) {
|
|
aDesiredSize.width = kidRect.width;
|
|
aDesiredSize.height = kidRect.height;
|
|
aDesiredSize.ascent = kidRect.height;
|
|
aDesiredSize.descent = 0;
|
|
}
|
|
else {
|
|
// Return the max size as our desired size
|
|
aDesiredSize.width = aReflowState.availableWidth;
|
|
aDesiredSize.height = aReflowState.availableHeight;
|
|
aDesiredSize.ascent = aReflowState.availableHeight;
|
|
aDesiredSize.descent = 0;
|
|
}
|
|
|
|
// If this is an initial reflow, resize reflow, or style change reflow
|
|
// then do a repaint
|
|
if ((eReflowReason_Initial == aReflowState.reason) ||
|
|
(eReflowReason_Resize == aReflowState.reason) ||
|
|
(eReflowReason_StyleChange == aReflowState.reason)) {
|
|
nsRect damageRect(0, 0, aDesiredSize.width, aDesiredSize.height);
|
|
Invalidate(aPresContext, damageRect, PR_FALSE);
|
|
}
|
|
|
|
NS_FRAME_TRACE_REFLOW_OUT("ViewportFrame::Reflow", aStatus);
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
ViewportFrame::GetFrameType(nsIAtom** aType) const
|
|
{
|
|
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
|
|
*aType = nsLayoutAtoms::viewportFrame;
|
|
NS_ADDREF(*aType);
|
|
return NS_OK;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
NS_IMETHODIMP
|
|
ViewportFrame::GetFrameName(nsString& aResult) const
|
|
{
|
|
return MakeFrameName("Viewport", aResult);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
ViewportFrame::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const
|
|
{
|
|
if (!aResult) {
|
|
return NS_ERROR_NULL_POINTER;
|
|
}
|
|
*aResult = sizeof(*this);
|
|
return NS_OK;
|
|
}
|
|
#endif
|