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gecko-dev/layout/generic/nsGfxScrollFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the NPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsHTMLParts.h"
#include "nsIPresContext.h"
#include "nsHTMLReflowCommand.h"
#include "nsIDeviceContext.h"
#include "nsPageFrame.h"
#include "nsViewsCID.h"
#include "nsIServiceManager.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsHTMLContainerFrame.h"
#include "nsIScrollableView.h"
#include "nsWidgetsCID.h"
#include "nsGfxScrollFrame.h"
#include "nsLayoutAtoms.h"
#include "nsIXMLContent.h"
#include "nsXULAtoms.h"
#include "nsHTMLAtoms.h"
#include "nsINameSpaceManager.h"
#include "nsISupportsArray.h"
#include "nsIDocument.h"
#include "nsIFontMetrics.h"
#include "nsIDocumentObserver.h"
#include "nsIDocument.h"
#include "nsIScrollPositionListener.h"
//#include "nsBoxFrame.h"
#include "nsIElementFactory.h"
#include "nsBoxLayoutState.h"
#include "nsINodeInfo.h"
#include "nsIScrollbarFrame.h"
#include "nsIScrollbarMediator.h"
#include "nsITextControlFrame.h"
#include "nsIDOMHTMLTextAreaElement.h"
#include "nsIPrintPreviewContext.h"
#include "nsIURI.h"
#include "nsGUIEvent.h"
//----------------------------------------------------------------------
class nsGfxScrollFrameInner : public nsIScrollPositionListener {
NS_DECL_ISUPPORTS
public:
nsGfxScrollFrameInner(nsGfxScrollFrame* aOuter);
virtual ~nsGfxScrollFrameInner();
// nsIScrollPositionListener
NS_IMETHOD ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
NS_IMETHOD ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
// This gets called when the 'curpos' attribute on one of the scrollbars changes
nsresult CurPosAttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aModType);
PRBool SetAttribute(nsIBox* aBox, nsIAtom* aAtom, nscoord aSize, PRBool aReflow=PR_TRUE);
PRInt32 GetIntegerAttribute(nsIBox* aFrame, nsIAtom* atom, PRInt32 defaultValue);
nsresult Layout(nsBoxLayoutState& aState);
nsresult LayoutBox(nsBoxLayoutState& aState, nsIBox* aBox, const nsRect& aRect);
// Like ScrollPositionDidChange, but initiated by this frame rather than from the
// scrolling view
void InternalScrollPositionDidChange(nscoord aX, nscoord aY);
PRBool AddRemoveScrollbar (PRBool& aHasScrollbar,
nscoord& aXY,
nscoord& aSize,
nscoord aSbSize,
PRBool aOnRightOrBottom,
PRBool aAdd);
PRBool AddRemoveScrollbar(nsBoxLayoutState& aState,
nsRect& aScrollAreaSize,
PRBool aOnTop,
PRBool aHorizontal,
PRBool aAdd);
PRBool AddHorizontalScrollbar (nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnBottom);
PRBool AddVerticalScrollbar (nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight);
PRBool RemoveHorizontalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnBottom);
PRBool RemoveVerticalScrollbar (nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight);
nsIScrollableView* GetScrollableView(nsIPresContext* aPresContext);
void ScrollbarChanged(nsIPresContext* aPresContext, nscoord aX, nscoord aY, PRUint32 aFlags);
void SetScrollbarVisibility(nsIBox* aScrollbar, PRBool aVisible);
NS_IMETHOD GetScrolledSize(nsIPresContext* aPresContext,
nscoord *aWidth,
nscoord *aHeight) const;
void AdjustReflowStateForPrintPreview(nsBoxLayoutState& aState, PRBool& aSetBack);
void AdjustReflowStateBack(nsBoxLayoutState& aState, PRBool aSetBack);
nsIBox* mHScrollbarBox;
nsIBox* mVScrollbarBox;
nsIBox* mScrollAreaBox;
nscoord mOnePixel;
nsGfxScrollFrame* mOuter;
nsIScrollableView* mScrollableView;
nscoord mMaxElementWidth;
PRPackedBool mNeverHasVerticalScrollbar;
PRPackedBool mNeverHasHorizontalScrollbar;
PRPackedBool mHasVerticalScrollbar;
PRPackedBool mHasHorizontalScrollbar;
PRPackedBool mFirstPass;
PRPackedBool mIsRoot;
PRPackedBool mNeverReflowed;
PRPackedBool mViewInitiatedScroll;
PRPackedBool mFrameInitiatedScroll;
};
NS_IMPL_ISUPPORTS1(nsGfxScrollFrameInner, nsIScrollPositionListener)
nsresult
NS_NewGfxScrollFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame, nsIDocument* aDocument, PRBool aIsRoot)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsGfxScrollFrame* it = new (aPresShell) nsGfxScrollFrame(aPresShell, aDocument, aIsRoot);
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
nsGfxScrollFrame::nsGfxScrollFrame(nsIPresShell* aShell, nsIDocument* aDocument, PRBool aIsRoot):nsBoxFrame(aShell, aIsRoot)
{
mInner = new nsGfxScrollFrameInner(this);
mInner->AddRef();
mPresContext = nsnull;
mInner->mIsRoot = PR_FALSE;
mInner->mNeverReflowed = PR_TRUE;
mInner->mViewInitiatedScroll = PR_FALSE;
mInner->mFrameInitiatedScroll = PR_FALSE;
SetLayoutManager(nsnull);
}
nsGfxScrollFrame::~nsGfxScrollFrame()
{
mInner->mOuter = nsnull;
mInner->Release();
mPresContext = nsnull;
}
/**
* Set the view that we are scrolling within the scrolling view.
*/
NS_IMETHODIMP
nsGfxScrollFrame::SetScrolledFrame(nsIPresContext* aPresContext, nsIFrame *aScrolledFrame)
{
NS_ERROR("Not implemented!");
/*
mFrames.DestroyFrame(aPresContext, mInner->mScrollAreaBox);
mInner->mScrollAreaBox = aScrolledFrame;
mFrames.InsertFrame(nsnull, nsnull, mInner->mScrollAreaBox);
*/
return NS_OK;
}
/**
* Get the view that we are scrolling within the scrolling view.
* @result child view
*/
NS_IMETHODIMP
nsGfxScrollFrame::GetScrolledFrame(nsIPresContext* aPresContext, nsIFrame *&aScrolledFrame) const
{
nsIBox* child = nsnull;
mInner->mScrollAreaBox->GetChildBox(&child);
child->GetFrame(&aScrolledFrame);
return NS_OK;
}
/**
* Gets the size of the area that lies inside the scrollbars but clips the scrolled frame
*/
NS_IMETHODIMP
nsGfxScrollFrame::GetClipSize(nsIPresContext* aPresContext,
nscoord *aWidth,
nscoord *aHeight) const
{
nsRect rect;
mInner->mScrollAreaBox->GetBounds(rect);
*aWidth = rect.width;
*aHeight = rect.height;
return NS_OK;
}
/**
* Get information about whether the vertical and horizontal scrollbars
* are currently visible
*/
NS_IMETHODIMP
nsGfxScrollFrame::GetScrollbarVisibility(nsIPresContext* aPresContext,
PRBool *aVerticalVisible,
PRBool *aHorizontalVisible) const
{
*aVerticalVisible = mInner->mHasVerticalScrollbar;
*aHorizontalVisible = mInner->mHasHorizontalScrollbar;
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetScrollableView(nsIPresContext* aContext, nsIScrollableView** aResult)
{
*aResult = mInner->GetScrollableView(aContext);
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetScrollPosition(nsIPresContext* aContext, nscoord &aX, nscoord& aY) const
{
nsIScrollableView* s = mInner->GetScrollableView(aContext);
return s->GetScrollPosition(aX, aY);
}
NS_IMETHODIMP
nsGfxScrollFrame::ScrollTo(nsIPresContext* aContext, nscoord aX, nscoord aY, PRUint32 aFlags)
{
nsIScrollableView* s = mInner->GetScrollableView(aContext);
return s->ScrollTo(aX, aY, aFlags);
}
/**
* Query whether scroll bars should be displayed all the time, never or
* only when necessary.
* @return current scrollbar selection
* XXX roc only 'Auto' is really tested for. This API should be simplified or
* eliminated.
*/
NS_IMETHODIMP
nsGfxScrollFrame::GetScrollPreference(nsIPresContext* aPresContext, nsScrollPref* aScrollPreference) const
{
ScrollbarStyles styles = GetScrollbarStyles();
if (styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL &&
styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
*aScrollPreference = AlwaysScroll;
} else if (styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL) {
*aScrollPreference = AlwaysScrollHorizontal;
} else if (styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
*aScrollPreference = AlwaysScrollVertical;
} else if (styles.mHorizontal == NS_STYLE_OVERFLOW_AUTO ||
styles.mVertical == NS_STYLE_OVERFLOW_AUTO) {
*aScrollPreference = Auto;
} else {
*aScrollPreference = NeverScroll;
}
return NS_OK;
}
/**
* Gets the size of the area that lies inside the scrollbars but clips the scrolled frame
*/
NS_IMETHODIMP
nsGfxScrollFrame::GetScrollbarSizes(nsIPresContext* aPresContext,
nscoord *aVbarWidth,
nscoord *aHbarHeight) const
{
nsBoxLayoutState state(aPresContext);
*aVbarWidth = 0;
*aHbarHeight = 0;
if (mInner->mHScrollbarBox) {
nsSize hs;
mInner->mHScrollbarBox->GetPrefSize(state, hs);
*aHbarHeight = hs.height;
}
if (mInner->mVScrollbarBox) {
nsSize vs;
mInner->mVScrollbarBox->GetPrefSize(state, vs);
*aVbarWidth = vs.width;
}
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::SetScrollbarVisibility(nsIPresContext* aPresContext,
PRBool aVerticalVisible,
PRBool aHorizontalVisible)
{
mInner->mNeverHasVerticalScrollbar = !aVerticalVisible;
mInner->mNeverHasHorizontalScrollbar = !aHorizontalVisible;
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetScrollbarBox(PRBool aVertical, nsIBox** aResult)
{
*aResult = aVertical ? mInner->mVScrollbarBox : mInner->mHScrollbarBox;
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::CreateAnonymousContent(nsIPresContext* aPresContext,
nsISupportsArray& aAnonymousChildren)
{
// Don't create scrollbars if we're printing/print previewing
// Get rid of this code when printing moves to its own presentation
PRBool isPaginated = PR_FALSE;
aPresContext->IsPaginated(&isPaginated);
if (isPaginated) {
// allow scrollbars if this is the child of the viewport, because
// we must be the scrollbars for the print preview window
nsIFrame* parent = GetParent();
if (!parent || parent->GetType() != nsLayoutAtoms::viewportFrame) {
SetScrollbarVisibility(aPresContext, PR_FALSE, PR_FALSE);
return NS_OK;
}
}
nsCOMPtr<nsIPresShell> shell;
aPresContext->GetShell(getter_AddRefs(shell));
nsCOMPtr<nsIDocument> document;
if (shell)
shell->GetDocument(getter_AddRefs(document));
// The anonymous <div> used by <inputs> never gets scrollbars.
nsCOMPtr<nsITextControlFrame> textFrame(do_QueryInterface(mParent));
if (textFrame) {
// Make sure we are not a text area.
nsCOMPtr<nsIDOMHTMLTextAreaElement> textAreaElement(do_QueryInterface(mParent->GetContent()));
if (!textAreaElement) {
SetScrollbarVisibility(aPresContext, PR_FALSE, PR_FALSE);
return NS_OK;
}
}
// create horzontal scrollbar
nsresult rv;
nsCOMPtr<nsIElementFactory> elementFactory =
do_GetService(NS_ELEMENT_FACTORY_CONTRACTID_PREFIX "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", &rv);
if (!elementFactory)
return NS_ERROR_FAILURE;
nsINodeInfoManager *nodeInfoManager = nsnull;
if (document)
nodeInfoManager = document->GetNodeInfoManager();
NS_ENSURE_TRUE(nodeInfoManager, NS_ERROR_FAILURE);
nsCOMPtr<nsINodeInfo> nodeInfo;
nodeInfoManager->GetNodeInfo(NS_LITERAL_CSTRING("scrollbar"), nsnull,
kNameSpaceID_XUL, getter_AddRefs(nodeInfo));
ScrollbarStyles styles = GetScrollbarStyles();
if (styles.mHorizontal == NS_STYLE_OVERFLOW_AUTO
|| styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL) {
nsCOMPtr<nsIContent> content;
elementFactory->CreateInstanceByTag(nodeInfo, getter_AddRefs(content));
content->SetAttr(kNameSpaceID_None, nsXULAtoms::orient,
NS_LITERAL_STRING("horizontal"), PR_FALSE);
content->SetAttr(kNameSpaceID_None, nsXULAtoms::collapsed,
NS_LITERAL_STRING("true"), PR_FALSE);
aAnonymousChildren.AppendElement(content);
}
if (styles.mVertical == NS_STYLE_OVERFLOW_AUTO
|| styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
nsCOMPtr<nsIContent> content;
elementFactory->CreateInstanceByTag(nodeInfo, getter_AddRefs(content));
content->SetAttr(kNameSpaceID_None, nsXULAtoms::orient,
NS_LITERAL_STRING("vertical"), PR_FALSE);
content->SetAttr(kNameSpaceID_None, nsXULAtoms::collapsed,
NS_LITERAL_STRING("true"), PR_FALSE);
aAnonymousChildren.AppendElement(content);
}
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::Destroy(nsIPresContext* aPresContext)
{
nsIScrollableView *view = mInner->GetScrollableView(aPresContext);
NS_ASSERTION(view, "unexpected null pointer");
if (view)
view->RemoveScrollPositionListener(mInner);
return nsBoxFrame::Destroy(aPresContext);
}
NS_IMETHODIMP
nsGfxScrollFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsStyleContext* aStyleContext,
nsIFrame* aPrevInFlow)
{
mPresContext = aPresContext;
nsresult rv = nsBoxFrame::Init(aPresContext, aContent,
aParent, aStyleContext,
aPrevInFlow);
return rv;
}
void nsGfxScrollFrame::ReloadChildFrames(nsIPresContext* aPresContext)
{
mInner->mScrollAreaBox = nsnull;
mInner->mHScrollbarBox = nsnull;
mInner->mVScrollbarBox = nsnull;
nsIFrame* frame = nsnull;
FirstChild(aPresContext, nsnull, &frame);
while (frame) {
PRBool understood = PR_FALSE;
nsIBox* box = nsnull;
frame->QueryInterface(NS_GET_IID(nsIBox), (void**)&box);
if (box) {
if (frame->GetType() == nsLayoutAtoms::scrollFrame) {
NS_ASSERTION(!mInner->mScrollAreaBox, "Found multiple scroll areas?");
mInner->mScrollAreaBox = box;
understood = PR_TRUE;
} else {
nsIContent* content = frame->GetContent();
if (content) {
nsAutoString value;
if (NS_CONTENT_ATTR_HAS_VALUE == content->GetAttr(kNameSpaceID_None,
nsXULAtoms::orient, value)) {
// probably a scrollbar then
if (value.EqualsIgnoreCase("horizontal")) {
NS_ASSERTION(!mInner->mHScrollbarBox, "Found multiple horizontal scrollbars?");
mInner->mHScrollbarBox = box;
} else {
NS_ASSERTION(!mInner->mVScrollbarBox, "Found multiple vertical scrollbars?");
mInner->mVScrollbarBox = box;
}
understood = PR_TRUE;
}
}
}
}
NS_ASSERTION(understood, "What is this frame doing here?");
frame = frame->GetNextSibling();
}
}
NS_IMETHODIMP
nsGfxScrollFrame::SetInitialChildList(nsIPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
nsresult rv = nsBoxFrame::SetInitialChildList(aPresContext, aListName,
aChildList);
ReloadChildFrames(aPresContext);
// listen for scroll events.
mInner->GetScrollableView(aPresContext)->AddScrollPositionListener(mInner);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::AppendFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
nsresult rv = nsBoxFrame::AppendFrames(aPresContext,
aPresShell,
aListName,
aFrameList);
ReloadChildFrames(aPresContext);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::InsertFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
nsresult rv = nsBoxFrame::InsertFrames(aPresContext,
aPresShell,
aListName,
aPrevFrame,
aFrameList);
ReloadChildFrames(aPresContext);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::RemoveFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
nsresult rv = nsBoxFrame::RemoveFrame(aPresContext,
aPresShell,
aListName,
aOldFrame);
ReloadChildFrames(aPresContext);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::ReplaceFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame)
{
nsresult rv = nsBoxFrame::ReplaceFrame(aPresContext,
aPresShell,
aListName,
aOldFrame,
aNewFrame);
ReloadChildFrames(aPresContext);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetPadding(nsMargin& aMargin)
{
aMargin.SizeTo(0,0,0,0);
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::Paint(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer,
PRUint32 aFlags)
{
nsresult result;
// Paint our children
result = nsBoxFrame::Paint(aPresContext, aRenderingContext, aDirtyRect,aWhichLayer);
return result;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetContentAndOffsetsFromPoint(nsIPresContext* aCX,
const nsPoint& aPoint,
nsIContent ** aNewContent,
PRInt32& aContentOffset,
PRInt32& aContentOffsetEnd,
PRBool& aBeginFrameContent)
{
if (! mInner)
return NS_ERROR_NULL_POINTER;
nsIFrame* frame = nsnull;
mInner->mScrollAreaBox->GetFrame(&frame);
nsPoint point(aPoint);
//we need to translate the coordinates to the inner
nsIView *view = GetClosestView();
if (!view)
return NS_ERROR_FAILURE;
nsIView *innerView = GetClosestView();
while (view != innerView && innerView)
{
point -= innerView->GetPosition();
innerView = innerView->GetParent();
}
return frame->GetContentAndOffsetsFromPoint(aCX, point, aNewContent, aContentOffset, aContentOffsetEnd, aBeginFrameContent);
}
PRIntn
nsGfxScrollFrame::GetSkipSides() const
{
return 0;
}
nsIAtom*
nsGfxScrollFrame::GetType() const
{
return nsLayoutAtoms::scrollFrame;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetAscent(nsBoxLayoutState& aState, nscoord& aAscent)
{
aAscent = 0;
nsresult rv = mInner->mScrollAreaBox->GetAscent(aState, aAscent);
nsMargin m(0,0,0,0);
GetBorderAndPadding(m);
aAscent += m.top;
GetMargin(m);
aAscent += m.top;
GetInset(m);
aAscent += m.top;
return rv;
}
nsGfxScrollFrame::ScrollbarStyles
nsGfxScrollFrame::GetScrollbarStyles() const
{
PRInt32 overflow = GetStyleDisplay()->mOverflow;
switch (overflow) {
case NS_STYLE_OVERFLOW_SCROLL:
case NS_STYLE_OVERFLOW_HIDDEN:
case NS_STYLE_OVERFLOW_VISIBLE:
case NS_STYLE_OVERFLOW_AUTO:
return ScrollbarStyles(overflow, overflow);
case NS_STYLE_OVERFLOW_SCROLLBARS_NONE:
return ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, NS_STYLE_OVERFLOW_HIDDEN);
case NS_STYLE_OVERFLOW_SCROLLBARS_VERTICAL:
return ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, NS_STYLE_OVERFLOW_SCROLL);
case NS_STYLE_OVERFLOW_SCROLLBARS_HORIZONTAL:
return ScrollbarStyles(NS_STYLE_OVERFLOW_SCROLL, NS_STYLE_OVERFLOW_HIDDEN);
default:
NS_NOTREACHED("invalid overflow value");
return ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, NS_STYLE_OVERFLOW_HIDDEN);
}
}
NS_IMETHODIMP
nsGfxScrollFrame::GetPrefSize(nsBoxLayoutState& aState, nsSize& aSize)
{
PropagateDebug(aState);
ScrollbarStyles styles = GetScrollbarStyles();
nsSize vSize(0,0);
if (mInner->mVScrollbarBox &&
styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
// make sure they are visible.
mInner->SetScrollbarVisibility(mInner->mVScrollbarBox, PR_TRUE);
mInner->mVScrollbarBox->GetPrefSize(aState, vSize);
nsBox::AddMargin(mInner->mVScrollbarBox, vSize);
}
nsSize hSize(0,0);
if (mInner->mHScrollbarBox &&
styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL) {
mInner->SetScrollbarVisibility(mInner->mHScrollbarBox, PR_TRUE);
mInner->mHScrollbarBox->GetPrefSize(aState, hSize);
nsBox::AddMargin(mInner->mHScrollbarBox, hSize);
}
// if one of the width and height is constrained,
// do smarter preferred size checking in case the scrolled frame is a block.
nsSize oldConstrainedSize;
aState.GetScrolledBlockSizeConstraint(oldConstrainedSize);
const nsHTMLReflowState* HTMLState = aState.GetReflowState();
nsSize computedSize(NS_INTRINSICSIZE, NS_INTRINSICSIZE);
if (HTMLState != nsnull) {
computedSize.width = HTMLState->mComputedWidth;
computedSize.height = HTMLState->mComputedHeight;
if ((computedSize.width == NS_INTRINSICSIZE)
!= (computedSize.height == NS_INTRINSICSIZE)) {
// adjust constraints in case we have scrollbars
if (computedSize.width != NS_INTRINSICSIZE) {
computedSize.width = PR_MAX(0, computedSize.width - vSize.width);
}
if (computedSize.height != NS_INTRINSICSIZE) {
computedSize.height = PR_MAX(0, computedSize.height - hSize.height);
}
aState.SetScrolledBlockSizeConstraint(computedSize);
} else {
aState.SetScrolledBlockSizeConstraint(nsSize(-1,-1));
}
} else {
aState.SetScrolledBlockSizeConstraint(nsSize(-1,-1));
}
nsresult rv = mInner->mScrollAreaBox->GetPrefSize(aState, aSize);
aState.SetScrolledBlockSizeConstraint(oldConstrainedSize);
if (computedSize.height == NS_INTRINSICSIZE
&& computedSize.width != NS_INTRINSICSIZE
&& aSize.width > computedSize.width
&& mInner->mHScrollbarBox
&& styles.mHorizontal == NS_STYLE_OVERFLOW_AUTO) {
// Add height of horizontal scrollbar which will be needed
mInner->SetScrollbarVisibility(mInner->mHScrollbarBox, PR_TRUE);
mInner->mHScrollbarBox->GetPrefSize(aState, hSize);
nsBox::AddMargin(mInner->mHScrollbarBox, hSize);
}
if (computedSize.width == NS_INTRINSICSIZE
&& computedSize.height != NS_INTRINSICSIZE
&& aSize.height > computedSize.height
&& mInner->mVScrollbarBox
&& styles.mVertical == NS_STYLE_OVERFLOW_AUTO) {
// Add width of vertical scrollbar which will be needed
mInner->SetScrollbarVisibility(mInner->mVScrollbarBox, PR_TRUE);
mInner->mVScrollbarBox->GetPrefSize(aState, vSize);
nsBox::AddMargin(mInner->mVScrollbarBox, vSize);
}
nsBox::AddMargin(mInner->mScrollAreaBox, aSize);
aSize.width += vSize.width;
aSize.height += hSize.height;
AddBorderAndPadding(aSize);
AddInset(aSize);
nsIBox::AddCSSPrefSize(aState, this, aSize);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetMinSize(nsBoxLayoutState& aState, nsSize& aSize)
{
PropagateDebug(aState);
nsresult rv = mInner->mScrollAreaBox->GetMinSize(aState, aSize);
ScrollbarStyles styles = GetScrollbarStyles();
if (mInner->mVScrollbarBox &&
styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
nsSize vSize(0,0);
mInner->mVScrollbarBox->GetMinSize(aState, vSize);
AddMargin(mInner->mVScrollbarBox, vSize);
aSize.width += vSize.width;
if (aSize.height < vSize.height)
aSize.height = vSize.height;
}
if (mInner->mHScrollbarBox &&
styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL) {
nsSize hSize(0,0);
mInner->mHScrollbarBox->GetMinSize(aState, hSize);
AddMargin(mInner->mHScrollbarBox, hSize);
aSize.height += hSize.height;
if (aSize.width < hSize.width)
aSize.width = hSize.width;
}
AddBorderAndPadding(aSize);
AddInset(aSize);
nsIBox::AddCSSMinSize(aState, this, aSize);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetMaxSize(nsBoxLayoutState& aState, nsSize& aSize)
{
PropagateDebug(aState);
aSize.width = NS_INTRINSICSIZE;
aSize.height = NS_INTRINSICSIZE;
AddBorderAndPadding(aSize);
AddInset(aSize);
nsIBox::AddCSSMaxSize(aState, this, aSize);
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsGfxScrollFrame", aReflowState.reason);
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
// if there is a max element request then set it to -1 so we can see if it gets set
if (aDesiredSize.mComputeMEW)
{
aDesiredSize.mMaxElementWidth = -1;
}
nsresult rv = nsBoxFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
// if it was set then cache it. Otherwise set it.
if (aDesiredSize.mComputeMEW)
{
// if not set then use the cached size. If set then set it.
if (aDesiredSize.mMaxElementWidth == -1)
aDesiredSize.mMaxElementWidth = mInner->mMaxElementWidth;
else
mInner->mMaxElementWidth = aDesiredSize.mMaxElementWidth;
}
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return rv;
}
NS_IMETHODIMP_(nsrefcnt)
nsGfxScrollFrame::AddRef(void)
{
return NS_OK;
}
NS_IMETHODIMP_(nsrefcnt)
nsGfxScrollFrame::Release(void)
{
return NS_OK;
}
#ifdef NS_DEBUG
NS_IMETHODIMP
nsGfxScrollFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("GfxScroll"), aResult);
}
#endif
NS_INTERFACE_MAP_BEGIN(nsGfxScrollFrame)
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_END_INHERITING(nsBoxFrame)
//-------------------- Inner ----------------------
nsGfxScrollFrameInner::nsGfxScrollFrameInner(nsGfxScrollFrame* aOuter):mHScrollbarBox(nsnull),
mVScrollbarBox(nsnull),
mScrollAreaBox(nsnull),
mOnePixel(20),
mHasVerticalScrollbar(PR_FALSE),
mHasHorizontalScrollbar(PR_FALSE)
{
mOuter = aOuter;
mMaxElementWidth = 0;
mFirstPass = PR_FALSE;
mNeverHasVerticalScrollbar = PR_FALSE;
mNeverHasHorizontalScrollbar = PR_FALSE;
}
NS_IMETHODIMP
nsGfxScrollFrameInner::ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
{
// Do nothing.
return NS_OK;
}
/**
* Called when someone (external or this frame) moves the scroll area.
*/
void
nsGfxScrollFrameInner::InternalScrollPositionDidChange(nscoord aX, nscoord aY)
{
if (mVScrollbarBox)
SetAttribute(mVScrollbarBox, nsXULAtoms::curpos, aY);
if (mHScrollbarBox)
SetAttribute(mHScrollbarBox, nsXULAtoms::curpos, aX);
}
/**
* Called if something externally moves the scroll area
* This can happen if the user pages up down or uses arrow keys
* So what we need to do up adjust the scrollbars to match.
*/
NS_IMETHODIMP
nsGfxScrollFrameInner::ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
{
NS_ASSERTION(!mViewInitiatedScroll, "Cannot reenter ScrollPositionDidChange");
mViewInitiatedScroll = PR_TRUE;
InternalScrollPositionDidChange(aX, aY);
mViewInitiatedScroll = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::CurPosAttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aModType)
{
return mInner->CurPosAttributeChanged(aPresContext, aChild, aModType);
}
nsresult
nsGfxScrollFrameInner::CurPosAttributeChanged(nsIPresContext* aPresContext,
nsIContent* aContent,
PRInt32 aModType)
{
NS_ASSERTION(aContent, "aContent must not be null");
// 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.
//
// 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 NS_OK;
nsIFrame* hframe = nsnull;
if (mHScrollbarBox)
mHScrollbarBox->GetFrame(&hframe);
nsIFrame* vframe = nsnull;
if (mVScrollbarBox)
mVScrollbarBox->GetFrame(&vframe);
nsIContent* vcontent = vframe ? vframe->GetContent() : nsnull;
nsIContent* hcontent = hframe ? hframe->GetContent() : nsnull;
if (hcontent == aContent || vcontent == aContent)
{
nscoord x = 0;
nscoord y = 0;
nsAutoString value;
if (hcontent && NS_CONTENT_ATTR_HAS_VALUE == hcontent->GetAttr(kNameSpaceID_None, nsXULAtoms::curpos, value))
{
PRInt32 error;
// convert it to an integer
x = value.ToInteger(&error);
}
if (vcontent && NS_CONTENT_ATTR_HAS_VALUE == vcontent->GetAttr(kNameSpaceID_None, nsXULAtoms::curpos, value))
{
PRInt32 error;
// convert it to an integer
y = value.ToInteger(&error);
}
// 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(mOuter->mPresContext);
if (s) {
s->GetScrollPosition(curPosX, curPosY);
if ((x*mOnePixel) == curPosX && (y*mOnePixel) == curPosY)
return NS_OK;
PRBool isSmooth = aContent->HasAttr(kNameSpaceID_None, nsXULAtoms::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.
s->GetScrollPosition(curPosX, curPosY);
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->mPresContext, x*mOnePixel, y*mOnePixel, isSmooth ? NS_VMREFRESH_SMOOTHSCROLL : 0);
// Fire the onScroll event now that we have scrolled
nsCOMPtr<nsIPresShell> presShell;
mOuter->mPresContext->GetShell(getter_AddRefs(presShell));
if (presShell) {
nsScrollbarEvent event;
event.eventStructType = NS_SCROLLBAR_EVENT;
event.message = NS_SCROLL_EVENT;
event.flags = 0;
nsEventStatus status = nsEventStatus_eIgnore;
// note if hcontent is non-null then hframe must be non-null.
// likewise for vcontent and vframe. Thus targetFrame will always
// be non-null in here.
nsIFrame* targetFrame =
hcontent == aContent ? hframe : vframe;
presShell->HandleEventWithTarget(&event, targetFrame,
aContent,
NS_EVENT_FLAG_INIT, &status);
}
}
}
return NS_OK;
}
nsIScrollableView*
nsGfxScrollFrameInner::GetScrollableView(nsIPresContext* aPresContext)
{
nsIFrame* frame = nsnull;
mScrollAreaBox->GetFrame(&frame);
nsIView* view = frame->GetView();
if (!view) return nsnull;
nsIScrollableView* scrollingView;
#ifdef DEBUG
nsresult result =
#endif
CallQueryInterface(view, &scrollingView);
NS_ASSERTION(NS_SUCCEEDED(result),
"assertion gfx scrollframe does not contain a scrollframe");
return scrollingView;
}
PRBool
nsGfxScrollFrameInner::AddHorizontalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnTop)
{
if (!mHScrollbarBox)
return PR_TRUE;
#ifdef IBMBIDI
PRInt32 dir = GetIntegerAttribute(mHScrollbarBox, nsXULAtoms::dir, -1);
const nsStyleVisibility* vis = mOuter->GetStyleVisibility();
// when creating the scrollbar for the first time, or whenever
// display direction is changed, scroll the view horizontally
if (dir != vis->mDirection) {
SetAttribute(mHScrollbarBox, nsXULAtoms::curpos,
(NS_STYLE_DIRECTION_LTR == vis->mDirection) ? 0 : 0x7FFFFFFF);
SetAttribute(mHScrollbarBox, nsXULAtoms::dir, vis->mDirection * mOnePixel);
}
#endif // IBMBIDI
return AddRemoveScrollbar(aState, aScrollAreaSize, aOnTop, PR_TRUE, PR_TRUE);
}
PRBool
nsGfxScrollFrameInner::AddVerticalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight)
{
if (!mVScrollbarBox)
return PR_TRUE;
return AddRemoveScrollbar(aState, aScrollAreaSize, aOnRight, PR_FALSE, PR_TRUE);
}
PRBool
nsGfxScrollFrameInner::RemoveHorizontalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnTop)
{
return AddRemoveScrollbar(aState, aScrollAreaSize, aOnTop, PR_TRUE, PR_FALSE);
}
PRBool
nsGfxScrollFrameInner::RemoveVerticalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight)
{
return AddRemoveScrollbar(aState, aScrollAreaSize, aOnRight, PR_FALSE, PR_FALSE);
}
PRBool
nsGfxScrollFrameInner::AddRemoveScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnTop, PRBool aHorizontal, PRBool aAdd)
{
if (aHorizontal) {
if (mNeverHasHorizontalScrollbar || !mHScrollbarBox)
return PR_FALSE;
if (aAdd)
SetScrollbarVisibility(mHScrollbarBox, aAdd);
nsSize hSize;
mHScrollbarBox->GetPrefSize(aState, hSize);
nsBox::AddMargin(mHScrollbarBox, hSize);
if (!aAdd)
SetScrollbarVisibility(mHScrollbarBox, aAdd);
PRBool hasHorizontalScrollbar;
PRBool fit = AddRemoveScrollbar(hasHorizontalScrollbar, aScrollAreaSize.y, aScrollAreaSize.height, hSize.height, aOnTop, aAdd);
mHasHorizontalScrollbar = hasHorizontalScrollbar; // because mHasHorizontalScrollbar is a PRPackedBool
if (!fit)
SetScrollbarVisibility(mHScrollbarBox, !aAdd);
return fit;
} else {
if (mNeverHasVerticalScrollbar || !mVScrollbarBox)
return PR_FALSE;
if (aAdd)
SetScrollbarVisibility(mVScrollbarBox, aAdd);
nsSize vSize;
mVScrollbarBox->GetPrefSize(aState, vSize);
if (!aAdd)
SetScrollbarVisibility(mVScrollbarBox, aAdd);
nsBox::AddMargin(mVScrollbarBox, vSize);
PRBool hasVerticalScrollbar;
PRBool fit = AddRemoveScrollbar(hasVerticalScrollbar, aScrollAreaSize.x, aScrollAreaSize.width, vSize.width, aOnTop, aAdd);
mHasVerticalScrollbar = hasVerticalScrollbar; // because mHasVerticalScrollbar is a PRPackedBool
if (!fit)
SetScrollbarVisibility(mVScrollbarBox, !aAdd);
return fit;
}
}
PRBool
nsGfxScrollFrameInner::AddRemoveScrollbar(PRBool& aHasScrollbar, nscoord& aXY, nscoord& aSize, nscoord aSbSize, PRBool aRightOrBottom, PRBool aAdd)
{
nscoord size = aSize;
if (size != NS_INTRINSICSIZE) {
if (aAdd) {
size -= aSbSize;
if (!aRightOrBottom && size >= 0)
aXY += aSbSize;
} else {
size += aSbSize;
if (!aRightOrBottom)
aXY -= aSbSize;
}
}
// not enough room? Yes? Return true.
if (size >= aSbSize) {
aHasScrollbar = aAdd;
aSize = size;
return PR_TRUE;
}
aHasScrollbar = PR_FALSE;
return PR_FALSE;
}
nsresult
nsGfxScrollFrameInner::LayoutBox(nsBoxLayoutState& aState, nsIBox* aBox, const nsRect& aRect)
{
return mOuter->LayoutChildAt(aState, aBox, aRect);
}
NS_IMETHODIMP
nsGfxScrollFrame::DoLayout(nsBoxLayoutState& aState)
{
PRUint32 flags = 0;
aState.GetLayoutFlags(flags);
nsresult rv = mInner->Layout(aState);
aState.SetLayoutFlags(flags);
nsBox::DoLayout(aState);
return rv;
}
/**
* When reflowing a HTML document where the content model is being created
* The nsGfxScrollFrame will get an Initial reflow when the body is opened by the content sink.
* But there isn't enough content to really reflow very much of the document
* so it never needs to do layout for the scrollbars
*
* So later other reflows happen and these are Incremental reflows, and then the scrollbars
* get reflowed. The important point here is that when they reflowed the ReflowState inside the
* BoxLayoutState contains an "Incremental" reason and never a "Initial" reason.
*
* When it reflows for Print Preview, the content model is already full constructed and it lays
* out the entire document at that time. When it returns back here it discovers it needs scrollbars
* and this is a problem because the ReflowState inside the BoxLayoutState still has a "Initial"
* reason and if it does a Layout it is essentially asking everything to reflow yet again with
* an "Initial" reason. This causes a lot of problems especially for tables.
*
* The solution for this is to change the ReflowState's reason from Initial to Resize and let
* all the frames do what is necessary for a resize refow. Now, we only need to do this when
* it is doing PrintPreview and we need only do it for HTML documents and NOT chrome.
*
*/
void
nsGfxScrollFrameInner::AdjustReflowStateForPrintPreview(nsBoxLayoutState& aState, PRBool& aSetBack)
{
aSetBack = PR_FALSE;
PRBool isChrome;
PRBool isInitialPP = nsBoxFrame::IsInitialReflowForPrintPreview(aState, isChrome);
if (isInitialPP && !isChrome) {
// I know you shouldn't, but we cast away the "const" here
nsHTMLReflowState* reflowState = (nsHTMLReflowState*)aState.GetReflowState();
reflowState->reason = eReflowReason_Resize;
aSetBack = PR_TRUE;
}
}
/**
* Sets reflow state back to Initial when we are done.
*/
void
nsGfxScrollFrameInner::AdjustReflowStateBack(nsBoxLayoutState& aState, PRBool aSetBack)
{
// I know you shouldn't, but we cast away the "const" here
nsHTMLReflowState* reflowState = (nsHTMLReflowState*)aState.GetReflowState();
if (aSetBack && reflowState->reason == eReflowReason_Resize) {
reflowState->reason = eReflowReason_Initial;
}
}
/**
* 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
nsGfxScrollFrameInner::Layout(nsBoxLayoutState& aState)
{
//TODO make bidi code set these from preferences
// if true places the vertical scrollbar on the right false puts it on the left.
PRBool scrollBarRight = PR_TRUE;
// if true places the horizontal scrollbar on the bottom false puts it on the top.
PRBool scrollBarBottom = PR_TRUE;
#ifdef IBMBIDI
const nsStyleVisibility* vis = mOuter->GetStyleVisibility();
//
// Direction Style from this->GetStyleData()
// now in (vis->mDirection)
// ------------------
// NS_STYLE_DIRECTION_LTR : LTR or Default
// NS_STYLE_DIRECTION_RTL
// NS_STYLE_DIRECTION_INHERIT
//
if (vis->mDirection == NS_STYLE_DIRECTION_RTL){
// if true places the vertical scrollbar on the right false puts it on the left.
scrollBarRight = PR_FALSE;
// if true places the horizontal scrollbar on the bottom false puts it on the top.
scrollBarBottom = PR_TRUE;
}
nsHTMLReflowState* reflowState = (nsHTMLReflowState*)aState.GetReflowState();
#endif // IBMBIDI
nsIFrame* frame = nsnull;
mOuter->GetFrame(&frame);
// get the content rect
nsRect clientRect(0,0,0,0);
mOuter->GetClientRect(clientRect);
// get the preferred size of the scrollbars
nsSize hSize(0,0);
nsSize vSize(0,0);
nsSize hMinSize(0,0);
nsSize vMinSize(0,0);
/*
mHScrollbarBox->GetPrefSize(aState, hSize);
mVScrollbarBox->GetPrefSize(aState, vSize);
mHScrollbarBox->GetMinSize(aState, hMinSize);
mVScrollbarBox->GetMinSize(aState, vMinSize);
nsBox::AddMargin(mHScrollbarBox, hSize);
nsBox::AddMargin(mVScrollbarBox, vSize);
nsBox::AddMargin(mHScrollbarBox, hMinSize);
nsBox::AddMargin(mVScrollbarBox, vMinSize);
*/
// the scroll area size starts off as big as our content area
nsRect scrollAreaRect(clientRect);
nsGfxScrollFrame::ScrollbarStyles styles = mOuter->GetScrollbarStyles();
// Look at our style do we always have vertical or horizontal scrollbars?
if (styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL)
mHasHorizontalScrollbar = PR_TRUE;
if (styles.mVertical == NS_STYLE_OVERFLOW_SCROLL)
mHasVerticalScrollbar = PR_TRUE;
if (mHasHorizontalScrollbar)
AddHorizontalScrollbar(aState, scrollAreaRect, scrollBarBottom);
if (mHasVerticalScrollbar)
AddVerticalScrollbar(aState, scrollAreaRect, scrollBarRight);
nsRect oldScrollAreaBounds;
mScrollAreaBox->GetClientRect(oldScrollAreaBounds);
// layout our the scroll area
LayoutBox(aState, mScrollAreaBox, scrollAreaRect);
// now look at the content area and see if we need scrollbars or not
PRBool needsLayout = PR_FALSE;
nsSize scrolledContentSize(0,0);
// if we have 'auto' scrollbars look at the vertical case
if (styles.mVertical != NS_STYLE_OVERFLOW_SCROLL) {
// get the area frame is the scrollarea
GetScrolledSize(aState.GetPresContext(),&scrolledContentSize.width, &scrolledContentSize.height);
// There are two cases to consider
if (scrolledContentSize.height <= scrollAreaRect.height
|| styles.mVertical != NS_STYLE_OVERFLOW_AUTO) {
if (mHasVerticalScrollbar) {
// We left room for the vertical scrollbar, but it's not needed;
// remove it.
if (RemoveVerticalScrollbar(aState, scrollAreaRect, scrollBarRight)) {
needsLayout = PR_TRUE;
SetAttribute(mVScrollbarBox, nsXULAtoms::curpos, 0);
}
}
} else {
if (!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);
resizeState.SetLayoutReason(nsBoxLayoutState::Resize);
PRBool setBack;
AdjustReflowStateForPrintPreview(aState, setBack);
LayoutBox(resizeState, mScrollAreaBox, scrollAreaRect);
AdjustReflowStateBack(aState, setBack);
needsLayout = PR_FALSE;
}
}
// if scrollbars are auto look at the horizontal case
if (styles.mHorizontal != NS_STYLE_OVERFLOW_SCROLL)
{
// get the area frame is the scrollarea
GetScrolledSize(aState.GetPresContext(),&scrolledContentSize.width, &scrolledContentSize.height);
// 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 (!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");
}
#ifdef IBMBIDI
const nsStyleVisibility* ourVis = frame->GetStyleVisibility();
if (NS_STYLE_DIRECTION_RTL == ourVis->mDirection) {
nsCOMPtr<nsITextControlFrame> textControl(
do_QueryInterface(mOuter->mParent) );
if (textControl) {
needsLayout = PR_TRUE;
reflowState->mRightEdge = scrolledContentSize.width;
mScrollAreaBox->MarkDirty(aState);
}
}
#endif // IBMBIDI
} else {
// if the area is smaller or equal to and we have a scrollbar then
// remove it.
if (mHasHorizontalScrollbar) {
if (RemoveHorizontalScrollbar(aState, scrollAreaRect, scrollBarBottom))
needsLayout = PR_TRUE;
SetAttribute(mHScrollbarBox, nsXULAtoms::curpos, 0);
}
}
}
// we only need to set the rect. The inner child stays the same size.
if (needsLayout) {
nsBoxLayoutState resizeState(aState);
resizeState.SetLayoutReason(nsBoxLayoutState::Resize);
PRBool setBack;
AdjustReflowStateForPrintPreview(aState, setBack);
LayoutBox(resizeState, mScrollAreaBox, scrollAreaRect);
AdjustReflowStateBack(aState, setBack);
needsLayout = PR_FALSE;
#ifdef IBMBIDI
reflowState->mRightEdge = NS_UNCONSTRAINEDSIZE;
#endif // IBMBIDI
}
GetScrolledSize(aState.GetPresContext(),&scrolledContentSize.width, &scrolledContentSize.height);
nsIPresContext* presContext = aState.GetPresContext();
float p2t;
presContext->GetScaledPixelsToTwips(&p2t);
mOnePixel = NSIntPixelsToTwips(1, p2t);
const nsStyleFont* font = mOuter->GetStyleFont();
const nsFont& f = font->mFont;
nsCOMPtr<nsIFontMetrics> fm;
presContext->GetMetricsFor(f, getter_AddRefs(fm));
nscoord fontHeight = 1;
NS_ASSERTION(fm,"FontMetrics is null assuming fontHeight == 1");
if (fm)
fm->GetHeight(fontHeight);
nscoord maxX = scrolledContentSize.width - scrollAreaRect.width;
nscoord maxY = scrolledContentSize.height - scrollAreaRect.height;
nsIScrollableView* scrollable = GetScrollableView(presContext);
scrollable->SetLineHeight(fontHeight);
if (mHScrollbarBox)
mHScrollbarBox->GetPrefSize(aState, hSize);
if (mVScrollbarBox)
mVScrollbarBox->GetPrefSize(aState, vSize);
// layout vertical scrollbar
nsRect vRect(clientRect);
vRect.width = vSize.width;
vRect.y = clientRect.y;
if (mHasHorizontalScrollbar) {
vRect.height -= hSize.height;
if (!scrollBarBottom)
vRect.y += hSize.height;
}
vRect.x = clientRect.x;
if (scrollBarRight)
vRect.x += clientRect.width - vSize.width;
if (mHasVerticalScrollbar && mVScrollbarBox) {
SetAttribute(mVScrollbarBox, nsXULAtoms::maxpos, maxY);
SetAttribute(mVScrollbarBox, nsXULAtoms::pageincrement, nscoord(scrollAreaRect.height - fontHeight));
SetAttribute(mVScrollbarBox, nsXULAtoms::increment, fontHeight);
}
if (mVScrollbarBox) {
LayoutBox(aState, mVScrollbarBox, vRect);
mVScrollbarBox->GetPrefSize(aState, vSize);
mVScrollbarBox->GetMinSize(aState, vMinSize);
}
if (mHasVerticalScrollbar && mVScrollbarBox && (vMinSize.width > vRect.width || vMinSize.height > vRect.height)) {
if (RemoveVerticalScrollbar(aState, scrollAreaRect, scrollBarRight)) {
needsLayout = PR_TRUE;
SetAttribute(mVScrollbarBox, nsXULAtoms::curpos, 0);
}
mVScrollbarBox->GetPrefSize(aState, vSize);
}
// layout horizontal scrollbar
nsRect hRect(clientRect);
hRect.height = hSize.height;
hRect.x = clientRect.x;
if (mHasVerticalScrollbar) {
hRect.width -= vSize.width;
if (!scrollBarRight)
hRect.x += vSize.width;
}
hRect.y = clientRect.y;
if (scrollBarBottom)
hRect.y += clientRect.height - hSize.height;
if (mHasHorizontalScrollbar && mHScrollbarBox) {
SetAttribute(mHScrollbarBox, nsXULAtoms::maxpos, maxX);
SetAttribute(mHScrollbarBox, nsXULAtoms::pageincrement, nscoord(float(scrollAreaRect.width)*0.8));
SetAttribute(mHScrollbarBox, nsXULAtoms::increment, 10*mOnePixel);
}
if (mHScrollbarBox) {
LayoutBox(aState, mHScrollbarBox, hRect);
mHScrollbarBox->GetMinSize(aState, hMinSize);
}
if (mHasHorizontalScrollbar && mHScrollbarBox && (hMinSize.width > hRect.width || hMinSize.height > hRect.height)) {
if (RemoveHorizontalScrollbar(aState, scrollAreaRect, scrollBarBottom)) {
needsLayout = PR_TRUE;
SetAttribute(mHScrollbarBox, nsXULAtoms::curpos, 0);
}
}
// we only need to set the rect. The inner child stays the same size.
if (needsLayout) {
nsBoxLayoutState resizeState(aState);
resizeState.SetLayoutReason(nsBoxLayoutState::Resize);
LayoutBox(resizeState, mScrollAreaBox, scrollAreaRect);
needsLayout = PR_FALSE;
}
// may need to update fixed position children of the viewport,
// if the client area changed size because of some dirty reflow
// (if the reflow is initial or resize, the fixed children will
// be re-laid out anyway)
if ((oldScrollAreaBounds.width != scrollAreaRect.width
|| oldScrollAreaBounds.height != scrollAreaRect.height)
&& nsBoxLayoutState::Dirty == aState.GetLayoutReason()) {
nsIFrame* parentFrame = mOuter->GetParent();
if (parentFrame) {
if (parentFrame->GetType() == nsLayoutAtoms::viewportFrame) {
// Usually there are no fixed children, so don't do anything unless there's
// at least one fixed child
nsIFrame* child;
if (NS_SUCCEEDED(parentFrame->FirstChild(mOuter->mPresContext,
nsLayoutAtoms::fixedList, &child)) && child) {
nsCOMPtr<nsIPresShell> presShell;
mOuter->mPresContext->GetShell(getter_AddRefs(presShell));
// force a reflow of the fixed children
nsFrame::CreateAndPostReflowCommand(presShell, parentFrame,
eReflowType_UserDefined, nsnull, nsnull, nsLayoutAtoms::fixedList);
}
}
}
}
return NS_OK;
}
void
nsGfxScrollFrameInner::ScrollbarChanged(nsIPresContext* aPresContext, nscoord aX, nscoord aY, PRUint32 aFlags)
{
nsIScrollableView* scrollable = GetScrollableView(aPresContext);
scrollable->ScrollTo(aX, aY, aFlags);
// printf("scrolling to: %d, %d\n", aX, aY);
}
nsGfxScrollFrameInner::~nsGfxScrollFrameInner()
{
}
/**
* Returns whether it actually needed to change the attribute
*/
PRBool
nsGfxScrollFrameInner::SetAttribute(nsIBox* aBox, nsIAtom* aAtom, nscoord aSize, PRBool aReflow)
{
// convert to pixels
aSize /= mOnePixel;
// only set the attribute if it changed.
PRInt32 current = GetIntegerAttribute(aBox, aAtom, -1);
if (current != aSize)
{
nsIFrame* frame = nsnull;
aBox->GetFrame(&frame);
nsAutoString newValue;
newValue.AppendInt(aSize);
frame->GetContent()->SetAttr(kNameSpaceID_None, aAtom, newValue, aReflow);
return PR_TRUE;
}
return PR_FALSE;
}
/**
* Gets the size of the area that lies inside the scrollbars but clips the scrolled frame
*/
NS_IMETHODIMP
nsGfxScrollFrameInner::GetScrolledSize(nsIPresContext* aPresContext,
nscoord *aWidth,
nscoord *aHeight) const
{
// our scrolled size is the size of our scrolled view.
nsIBox* child = nsnull;
mScrollAreaBox->GetChildBox(&child);
nsIFrame* frame;
child->GetFrame(&frame);
nsIView* view = frame->GetView();
NS_ASSERTION(view,"Scrolled frame must have a view!!!");
nsRect rect = view->GetBounds();
nsSize size(rect.width, rect.height);
nsBox::AddMargin(child, size);
nsBox::AddBorderAndPadding(mScrollAreaBox, size);
nsBox::AddInset(mScrollAreaBox, size);
*aWidth = size.width;
*aHeight = size.height;
return NS_OK;
}
void
nsGfxScrollFrameInner::SetScrollbarVisibility(nsIBox* aScrollbar, PRBool aVisible)
{
if (!aScrollbar)
return;
nsIFrame* frame = nsnull;
aScrollbar->GetFrame(&frame);
nsIContent* content = frame->GetContent();
PRBool old = PR_TRUE;
nsAutoString value;
if (NS_CONTENT_ATTR_HAS_VALUE == content->GetAttr(kNameSpaceID_None, nsXULAtoms::collapsed, value))
old = PR_FALSE;
if (aVisible == old)
return;
if (!aVisible) {
content->SetAttr(kNameSpaceID_None, nsXULAtoms::collapsed, NS_LITERAL_STRING("true"), PR_TRUE);
} else {
// disable laziness; we never want to recreate these scrollbars again
// once we've created them
// disable laziness FIRST so only one recreation happens.
content->UnsetAttr(kNameSpaceID_None, nsXULAtoms::collapsed, PR_TRUE);
}
nsCOMPtr<nsIScrollbarFrame> scrollbar(do_QueryInterface(aScrollbar));
if (scrollbar) {
// See if we have a mediator.
nsCOMPtr<nsIScrollbarMediator> mediator;
scrollbar->GetScrollbarMediator(getter_AddRefs(mediator));
if (mediator) {
// Inform the mediator of the visibility change.
mediator->VisibilityChanged(aVisible);
}
}
}
PRInt32
nsGfxScrollFrameInner::GetIntegerAttribute(nsIBox* aBox, nsIAtom* atom, PRInt32 defaultValue)
{
nsIFrame* frame = nsnull;
aBox->GetFrame(&frame);
nsIContent* content = frame->GetContent();
nsAutoString value;
if (NS_CONTENT_ATTR_HAS_VALUE == content->GetAttr(kNameSpaceID_None, atom, value))
{
PRInt32 error;
// convert it to an integer
defaultValue = value.ToInteger(&error);
}
return defaultValue;
}
nsresult
nsGfxScrollFrame::GetContentOf(nsIContent** aContent)
{
*aContent = GetContent();
NS_IF_ADDREF(*aContent);
return NS_OK;
}
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