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gecko/layout/generic/nsContainerFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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):
* Pierre Phaneuf <pp@ludusdesign.com>
* Elika J. Etemad ("fantasai") <fantasai@inkedblade.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 MPL, 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 MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* base class #1 for rendering objects that have child lists */
#include "nsContainerFrame.h"
#include "nsHTMLContainerFrame.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsPresContext.h"
#include "nsIRenderingContext.h"
#include "nsStyleContext.h"
#include "nsRect.h"
#include "nsPoint.h"
#include "nsGUIEvent.h"
#include "nsStyleConsts.h"
#include "nsIView.h"
#include "nsHTMLContainerFrame.h"
#include "nsFrameManager.h"
#include "nsIPresShell.h"
#include "nsCOMPtr.h"
#include "nsGkAtoms.h"
#include "nsCSSAnonBoxes.h"
#include "nsIViewManager.h"
#include "nsIWidget.h"
#include "nsGfxCIID.h"
#include "nsIServiceManager.h"
#include "nsCSSRendering.h"
#include "nsTransform2D.h"
#include "nsRegion.h"
#include "nsLayoutErrors.h"
#include "nsDisplayList.h"
#include "nsContentErrors.h"
#include "nsIEventStateManager.h"
#include "nsListControlFrame.h"
#include "nsIBaseWindow.h"
#include "nsThemeConstants.h"
#include "nsCSSFrameConstructor.h"
#include "nsThemeConstants.h"
#ifdef NS_DEBUG
#undef NOISY
#else
#undef NOISY
#endif
NS_IMPL_FRAMEARENA_HELPERS(nsContainerFrame)
nsContainerFrame::~nsContainerFrame()
{
}
NS_QUERYFRAME_HEAD(nsContainerFrame)
NS_QUERYFRAME_ENTRY(nsContainerFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsSplittableFrame)
NS_IMETHODIMP
nsContainerFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsSplittableFrame::Init(aContent, aParent, aPrevInFlow);
if (aPrevInFlow) {
// Make sure we copy bits from our prev-in-flow that will affect
// us. A continuation for a container frame needs to know if it
// has a child with a view so that we'll properly reposition it.
if (aPrevInFlow->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)
AddStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW);
}
return rv;
}
NS_IMETHODIMP
nsContainerFrame::SetInitialChildList(nsIAtom* aListName,
nsFrameList& aChildList)
{
nsresult result;
if (mFrames.NotEmpty()) {
// We already have child frames which means we've already been
// initialized
NS_NOTREACHED("unexpected second call to SetInitialChildList");
result = NS_ERROR_UNEXPECTED;
} else if (aListName) {
// All we know about is the unnamed principal child list
NS_NOTREACHED("unknown frame list");
result = NS_ERROR_INVALID_ARG;
} else {
#ifdef NS_DEBUG
nsFrame::VerifyDirtyBitSet(aChildList);
#endif
mFrames.SetFrames(aChildList);
result = NS_OK;
}
return result;
}
NS_IMETHODIMP
nsContainerFrame::AppendFrames(nsIAtom* aListName,
nsFrameList& aFrameList)
{
if (nsnull != aListName) {
#ifdef IBMBIDI
if (aListName != nsGkAtoms::nextBidi)
#endif
{
NS_ERROR("unexpected child list");
return NS_ERROR_INVALID_ARG;
}
}
if (aFrameList.NotEmpty()) {
mFrames.AppendFrames(this, aFrameList);
// Ask the parent frame to reflow me.
#ifdef IBMBIDI
if (nsnull == aListName)
#endif
{
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
}
return NS_OK;
}
NS_IMETHODIMP
nsContainerFrame::InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
"inserting after sibling frame with different parent");
if (nsnull != aListName) {
#ifdef IBMBIDI
if (aListName != nsGkAtoms::nextBidi)
#endif
{
NS_ERROR("unexpected child list");
return NS_ERROR_INVALID_ARG;
}
}
if (aFrameList.NotEmpty()) {
// Insert frames after aPrevFrame
mFrames.InsertFrames(this, aPrevFrame, aFrameList);
#ifdef IBMBIDI
if (nsnull == aListName)
#endif
{
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
}
return NS_OK;
}
NS_IMETHODIMP
nsContainerFrame::RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame)
{
if (nsnull != aListName) {
#ifdef IBMBIDI
if (nsGkAtoms::nextBidi != aListName)
#endif
{
NS_ERROR("unexpected child list");
return NS_ERROR_INVALID_ARG;
}
}
if (aOldFrame) {
// Loop and destroy the frame and all of its continuations.
// If the frame we are removing is a brFrame, we need a reflow so
// the line the brFrame was on can attempt to pull up any frames
// that can fit from lines below it.
PRBool generateReflowCommand = PR_TRUE;
#ifdef IBMBIDI
if (nsGkAtoms::nextBidi == aListName) {
generateReflowCommand = PR_FALSE;
}
#endif
nsContainerFrame* parent = static_cast<nsContainerFrame*>(aOldFrame->GetParent());
while (aOldFrame) {
// When the parent is an inline frame we have a simple task - just
// remove the frame from its parents list and generate a reflow
// command.
nsIFrame* oldFrameNextContinuation = aOldFrame->GetNextContinuation();
//XXXfr probably should use StealFrame here. I'm not sure if we need to
// check the overflow lists atm, but we'll need a prescontext lookup
// for overflow containers once we can split abspos elements with
// inline containing blocks.
if (parent == this) {
if (!parent->mFrames.DestroyFrameIfPresent(aOldFrame)) {
// Try to remove it from our overflow list, if we have one.
// The simplest way is to reuse StealFrame.
StealFrame(PresContext(), aOldFrame, PR_TRUE);
aOldFrame->Destroy();
}
} else {
// This recursive call takes care of all continuations after aOldFrame,
// so we don't need to loop anymore.
parent->RemoveFrame(nsnull, aOldFrame);
break;
}
aOldFrame = oldFrameNextContinuation;
if (aOldFrame) {
parent = static_cast<nsContainerFrame*>(aOldFrame->GetParent());
}
}
if (generateReflowCommand) {
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
}
return NS_OK;
}
void
nsContainerFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
// Prevent event dispatch during destruction
if (HasView()) {
GetView()->SetClientData(nsnull);
}
// Delete the primary child list
mFrames.DestroyFramesFrom(aDestructRoot);
// Destroy auxiliary frame lists
nsPresContext* prescontext = PresContext();
DestroyOverflowList(prescontext, aDestructRoot);
if (IsFrameOfType(nsIFrame::eCanContainOverflowContainers)) {
nsFrameList* frameList = RemovePropTableFrames(prescontext,
nsGkAtoms::overflowContainersProperty);
if (frameList)
frameList->DestroyFrom(aDestructRoot);
frameList = RemovePropTableFrames(prescontext,
nsGkAtoms::excessOverflowContainersProperty);
if (frameList)
frameList->DestroyFrom(aDestructRoot);
}
if (IsGeneratedContentFrame()) {
// Make sure all the content nodes for the generated content inside
// this frame know it's going away.
// See also nsCSSFrameConstructor::CreateGeneratedContentFrame which
// created this frame.
nsCOMArray<nsIContent>* generatedContent =
static_cast<nsCOMArray<nsIContent>*>(
UnsetProperty(nsGkAtoms::generatedContent));
if (generatedContent) {
for (int i = generatedContent->Count() - 1; i >= 0; --i) {
nsIContent* content = generatedContent->ObjectAt(i);
// Tell the ESM that this content is going away now, so it'll update
// its hover content, etc.
PresContext()->EventStateManager()->
ContentRemoved(content->GetCurrentDoc(), content);
content->UnbindFromTree();
}
delete generatedContent;
}
}
// Destroy the frame and remove the flow pointers
nsSplittableFrame::DestroyFrom(aDestructRoot);
}
/////////////////////////////////////////////////////////////////////////////
// Child frame enumeration
nsFrameList
nsContainerFrame::GetChildList(nsIAtom* aListName) const
{
// We only know about the unnamed principal child list and the overflow
// lists
if (nsnull == aListName) {
return mFrames;
}
if (nsGkAtoms::overflowList == aListName) {
nsFrameList* frameList = GetOverflowFrames();
return frameList ? *frameList : nsFrameList::EmptyList();
}
if (nsGkAtoms::overflowContainersList == aListName) {
nsFrameList* list = GetPropTableFrames(PresContext(),
nsGkAtoms::overflowContainersProperty);
return list ? *list : nsFrameList::EmptyList();
}
if (nsGkAtoms::excessOverflowContainersList == aListName) {
nsFrameList* list = GetPropTableFrames(PresContext(),
nsGkAtoms::excessOverflowContainersProperty);
return list ? *list : nsFrameList::EmptyList();
}
return nsFrameList::EmptyList();
}
#define NS_CONTAINER_FRAME_OVERFLOW_LIST_INDEX 0
#define NS_CONTAINER_FRAME_OVERFLOW_CONTAINERS_LIST_INDEX 1
#define NS_CONTAINER_FRAME_EXCESS_OVERFLOW_CONTAINERS_LIST_INDEX 2
// If adding/removing lists, don't forget to update count in .h file
nsIAtom*
nsContainerFrame::GetAdditionalChildListName(PRInt32 aIndex) const
{
if (NS_CONTAINER_FRAME_OVERFLOW_LIST_INDEX == aIndex)
return nsGkAtoms::overflowList;
else if (IsFrameOfType(nsIFrame::eCanContainOverflowContainers)) {
if (NS_CONTAINER_FRAME_OVERFLOW_CONTAINERS_LIST_INDEX == aIndex)
return nsGkAtoms::overflowContainersList;
else if (NS_CONTAINER_FRAME_EXCESS_OVERFLOW_CONTAINERS_LIST_INDEX == aIndex)
return nsGkAtoms::excessOverflowContainersList;
}
return nsnull;
}
/////////////////////////////////////////////////////////////////////////////
// Painting/Events
NS_IMETHODIMP
nsContainerFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
NS_ENSURE_SUCCESS(rv, rv);
return BuildDisplayListForNonBlockChildren(aBuilder, aDirtyRect, aLists);
}
nsresult
nsContainerFrame::BuildDisplayListForNonBlockChildren(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists,
PRUint32 aFlags)
{
nsIFrame* kid = mFrames.FirstChild();
// Put each child's background directly onto the content list
nsDisplayListSet set(aLists, aLists.Content());
// The children should be in content order
while (kid) {
nsresult rv = BuildDisplayListForChild(aBuilder, kid, aDirtyRect, set, aFlags);
NS_ENSURE_SUCCESS(rv, rv);
kid = kid->GetNextSibling();
}
return NS_OK;
}
/* virtual */ void
nsContainerFrame::ChildIsDirty(nsIFrame* aChild)
{
AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
}
PRBool
nsContainerFrame::IsLeaf() const
{
return PR_FALSE;
}
PRBool
nsContainerFrame::PeekOffsetNoAmount(PRBool aForward, PRInt32* aOffset)
{
NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
// Don't allow the caret to stay in an empty (leaf) container frame.
return PR_FALSE;
}
PRBool
nsContainerFrame::PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset)
{
NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
// Don't allow the caret to stay in an empty (leaf) container frame.
return PR_FALSE;
}
/////////////////////////////////////////////////////////////////////////////
// Helper member functions
/**
* Position the view associated with |aKidFrame|, if there is one. A
* container frame should call this method after positioning a frame,
* but before |Reflow|.
*/
void
nsContainerFrame::PositionFrameView(nsIFrame* aKidFrame)
{
nsIFrame* parentFrame = aKidFrame->GetParent();
if (!aKidFrame->HasView() || !parentFrame)
return;
nsIView* view = aKidFrame->GetView();
nsIViewManager* vm = view->GetViewManager();
nsPoint pt;
nsIView* ancestorView = parentFrame->GetClosestView(&pt);
if (ancestorView != view->GetParent()) {
NS_ASSERTION(ancestorView == view->GetParent()->GetParent(),
"Allowed only one anonymous view between frames");
// parentFrame is responsible for positioning aKidFrame's view
// explicitly
return;
}
pt += aKidFrame->GetPosition();
vm->MoveViewTo(view, pt.x, pt.y);
}
static nsIWidget*
GetPresContextContainerWidget(nsPresContext* aPresContext)
{
nsCOMPtr<nsISupports> container = aPresContext->Document()->GetContainer();
nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(container);
if (!baseWindow)
return nsnull;
nsCOMPtr<nsIWidget> mainWidget;
baseWindow->GetMainWidget(getter_AddRefs(mainWidget));
return mainWidget;
}
static PRBool
IsTopLevelWidget(nsIWidget* aWidget)
{
nsWindowType windowType;
aWidget->GetWindowType(windowType);
return windowType == eWindowType_toplevel ||
windowType == eWindowType_dialog ||
windowType == eWindowType_sheet;
// popups aren't toplevel so they're not handled here
}
void
nsContainerFrame::SyncWindowProperties(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsIView* aView)
{
#ifdef MOZ_XUL
if (!aView || !nsCSSRendering::IsCanvasFrame(aFrame) || !aView->HasWidget())
return;
nsIWidget* windowWidget = GetPresContextContainerWidget(aPresContext);
if (!windowWidget || !IsTopLevelWidget(windowWidget))
return;
nsIViewManager* vm = aView->GetViewManager();
nsIView* rootView;
vm->GetRootView(rootView);
if (aView != rootView)
return;
nsIContent* rootContent = aPresContext->Document()->GetRootContent();
if (!rootContent || !rootContent->IsXUL()) {
// Scrollframes use native widgets which don't work well with
// translucent windows, at least in Windows XP. So if the document
// has a root scrollrame it's useless to try to make it transparent,
// we'll just get something broken.
// nsCSSFrameConstructor::ConstructRootFrame constructs root
// scrollframes whenever the root element is not a XUL element, so
// we test for that here. We can't just call
// presShell->GetRootScrollFrame() since that might not have
// been constructed yet.
// We can change this to allow translucent toplevel HTML documents
// (e.g. to do something like Dashboard widgets), once we
// have broad support for translucent scrolled documents, but be
// careful because apparently some Firefox extensions expect
// openDialog("something.html") to produce an opaque window
// even if the HTML doesn't have a background-color set.
return;
}
nsIFrame *rootFrame = aPresContext->PresShell()->FrameConstructor()->GetRootElementStyleFrame();
if (!rootFrame)
return;
nsTransparencyMode mode = nsLayoutUtils::GetFrameTransparency(aFrame, rootFrame);
nsIWidget* viewWidget = aView->GetWidget();
viewWidget->SetTransparencyMode(mode);
windowWidget->SetWindowShadowStyle(rootFrame->GetStyleUIReset()->mWindowShadow);
#endif
}
void
nsContainerFrame::SyncFrameViewAfterReflow(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsIView* aView,
const nsRect* aCombinedArea,
PRUint32 aFlags)
{
if (!aView) {
return;
}
NS_ASSERTION(aCombinedArea, "Combined area must be passed in now");
// Make sure the view is sized and positioned correctly
if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
PositionFrameView(aFrame);
}
if (0 == (aFlags & NS_FRAME_NO_SIZE_VIEW)) {
nsIViewManager* vm = aView->GetViewManager();
vm->ResizeView(aView, *aCombinedArea, PR_TRUE);
}
}
void
nsContainerFrame::SyncFrameViewProperties(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsStyleContext* aStyleContext,
nsIView* aView,
PRUint32 aFlags)
{
NS_ASSERTION(!aStyleContext || aFrame->GetStyleContext() == aStyleContext,
"Wrong style context for frame?");
if (!aView) {
return;
}
nsIViewManager* vm = aView->GetViewManager();
if (nsnull == aStyleContext) {
aStyleContext = aFrame->GetStyleContext();
}
// Make sure visibility is correct. This only affects nsSubdocumentFrame.
if (0 == (aFlags & NS_FRAME_NO_VISIBILITY) &&
!aFrame->SupportsVisibilityHidden()) {
// See if the view should be hidden or visible
vm->SetViewVisibility(aView,
aStyleContext->GetStyleVisibility()->IsVisible()
? nsViewVisibility_kShow : nsViewVisibility_kHide);
}
// See if the frame is being relatively positioned or absolutely
// positioned
PRBool isPositioned = aStyleContext->GetStyleDisplay()->IsPositioned();
PRInt32 zIndex = 0;
PRBool autoZIndex = PR_FALSE;
if (!isPositioned) {
autoZIndex = PR_TRUE;
} else {
// Make sure z-index is correct
const nsStylePosition* position = aStyleContext->GetStylePosition();
if (position->mZIndex.GetUnit() == eStyleUnit_Integer) {
zIndex = position->mZIndex.GetIntValue();
} else if (position->mZIndex.GetUnit() == eStyleUnit_Auto) {
autoZIndex = PR_TRUE;
}
}
vm->SetViewZIndex(aView, autoZIndex, zIndex, isPositioned);
}
static nscoord GetCoord(const nsStyleCoord& aCoord, nscoord aIfNotCoord)
{
return aCoord.GetUnit() == eStyleUnit_Coord
? aCoord.GetCoordValue()
: aIfNotCoord;
}
void
nsContainerFrame::DoInlineIntrinsicWidth(nsIRenderingContext *aRenderingContext,
InlineIntrinsicWidthData *aData,
nsLayoutUtils::IntrinsicWidthType aType)
{
if (GetPrevInFlow())
return; // Already added.
NS_PRECONDITION(aType == nsLayoutUtils::MIN_WIDTH ||
aType == nsLayoutUtils::PREF_WIDTH, "bad type");
PRUint8 startSide, endSide;
if (GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_LTR) {
startSide = NS_SIDE_LEFT;
endSide = NS_SIDE_RIGHT;
} else {
startSide = NS_SIDE_RIGHT;
endSide = NS_SIDE_LEFT;
}
const nsStylePadding *stylePadding = GetStylePadding();
const nsStyleBorder *styleBorder = GetStyleBorder();
const nsStyleMargin *styleMargin = GetStyleMargin();
// This goes at the beginning no matter how things are broken and how
// messy the bidi situations are, since per CSS2.1 section 8.6
// (implemented in bug 328168), the startSide border is always on the
// first line.
// This frame is a first-in-flow, but it might have a previous bidi
// continuation, in which case that continuation should handle the startSide
// border.
if (!GetPrevContinuation()) {
aData->currentLine +=
GetCoord(stylePadding->mPadding.Get(startSide), 0) +
styleBorder->GetActualBorderWidth(startSide) +
GetCoord(styleMargin->mMargin.Get(startSide), 0);
}
const nsLineList_iterator* savedLine = aData->line;
nsIFrame* const savedLineContainer = aData->lineContainer;
nsContainerFrame *lastInFlow;
for (nsContainerFrame *nif = this; nif;
nif = static_cast<nsContainerFrame*>(nif->GetNextInFlow())) {
for (nsIFrame *kid = nif->mFrames.FirstChild(); kid;
kid = kid->GetNextSibling()) {
if (aType == nsLayoutUtils::MIN_WIDTH)
kid->AddInlineMinWidth(aRenderingContext,
static_cast<InlineMinWidthData*>(aData));
else
kid->AddInlinePrefWidth(aRenderingContext,
static_cast<InlinePrefWidthData*>(aData));
}
// After we advance to our next-in-flow, the stored line and line container
// may no longer be correct. Just forget them.
aData->line = nsnull;
aData->lineContainer = nsnull;
lastInFlow = nif;
}
aData->line = savedLine;
aData->lineContainer = savedLineContainer;
// This goes at the end no matter how things are broken and how
// messy the bidi situations are, since per CSS2.1 section 8.6
// (implemented in bug 328168), the endSide border is always on the
// last line.
// We reached the last-in-flow, but it might have a next bidi
// continuation, in which case that continuation should handle
// the endSide border.
if (!lastInFlow->GetNextContinuation()) {
aData->currentLine +=
GetCoord(stylePadding->mPadding.Get(endSide), 0) +
styleBorder->GetActualBorderWidth(endSide) +
GetCoord(styleMargin->mMargin.Get(endSide), 0);
}
}
/* virtual */ nsSize
nsContainerFrame::ComputeAutoSize(nsIRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder,
nsSize aPadding, PRBool aShrinkWrap)
{
nsSize result(0xdeadbeef, NS_UNCONSTRAINEDSIZE);
nscoord availBased = aAvailableWidth - aMargin.width - aBorder.width -
aPadding.width;
// replaced elements always shrink-wrap
if (aShrinkWrap || IsFrameOfType(eReplaced)) {
// don't bother setting it if the result won't be used
if (GetStylePosition()->mWidth.GetUnit() == eStyleUnit_Auto) {
result.width = ShrinkWidthToFit(aRenderingContext, availBased);
}
} else {
result.width = availBased;
}
return result;
}
/**
* Invokes the WillReflow() function, positions the frame and its view (if
* requested), and then calls Reflow(). If the reflow succeeds and the child
* frame is complete, deletes any next-in-flows using DeleteNextInFlowChild()
*/
nsresult
nsContainerFrame::ReflowChild(nsIFrame* aKidFrame,
nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nscoord aX,
nscoord aY,
PRUint32 aFlags,
nsReflowStatus& aStatus,
nsOverflowContinuationTracker* aTracker)
{
NS_PRECONDITION(aReflowState.frame == aKidFrame, "bad reflow state");
nsresult result;
// Send the WillReflow() notification, and position the child frame
// and its view if requested
aKidFrame->WillReflow(aPresContext);
if (NS_FRAME_NO_MOVE_FRAME != (aFlags & NS_FRAME_NO_MOVE_FRAME)) {
if ((aFlags & NS_FRAME_INVALIDATE_ON_MOVE) &&
!(aKidFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW) &&
aKidFrame->GetPosition() != nsPoint(aX, aY)) {
aKidFrame->InvalidateOverflowRect();
}
aKidFrame->SetPosition(nsPoint(aX, aY));
}
if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
PositionFrameView(aKidFrame);
}
// Reflow the child frame
result = aKidFrame->Reflow(aPresContext, aDesiredSize, aReflowState,
aStatus);
// If the reflow was successful and the child frame is complete, delete any
// next-in-flows
if (NS_SUCCEEDED(result) && NS_FRAME_IS_FULLY_COMPLETE(aStatus)) {
nsIFrame* kidNextInFlow = aKidFrame->GetNextInFlow();
if (nsnull != kidNextInFlow) {
// Remove all of the childs next-in-flows. Make sure that we ask
// the right parent to do the removal (it's possible that the
// parent is not this because we are executing pullup code)
if (aTracker) aTracker->Finish(aKidFrame);
static_cast<nsContainerFrame*>(kidNextInFlow->GetParent())
->DeleteNextInFlowChild(aPresContext, kidNextInFlow, PR_TRUE);
}
}
return result;
}
/**
* Position the views of |aFrame|'s descendants. A container frame
* should call this method if it moves a frame after |Reflow|.
*/
void
nsContainerFrame::PositionChildViews(nsIFrame* aFrame)
{
if (!(aFrame->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)) {
return;
}
nsIAtom* childListName = nsnull;
PRInt32 childListIndex = 0;
do {
// Recursively walk aFrame's child frames
nsIFrame* childFrame = aFrame->GetFirstChild(childListName);
while (childFrame) {
// Position the frame's view (if it has one) otherwise recursively
// process its children
if (childFrame->HasView()) {
PositionFrameView(childFrame);
} else {
PositionChildViews(childFrame);
}
// Get the next sibling child frame
childFrame = childFrame->GetNextSibling();
}
// also process the additional child lists, but skip the popup list as the
// view for popups is managed by the parent. Currently only nsMenuFrame
// has a popupList and during layout will call nsMenuPopupFrame::AdjustView.
do {
childListName = aFrame->GetAdditionalChildListName(childListIndex++);
} while (childListName == nsGkAtoms::popupList);
} while (childListName);
}
/**
* The second half of frame reflow. Does the following:
* - sets the frame's bounds
* - sizes and positions (if requested) the frame's view. If the frame's final
* position differs from the current position and the frame itself does not
* have a view, then any child frames with views are positioned so they stay
* in sync
* - sets the view's visibility, opacity, content transparency, and clip
* - invoked the DidReflow() function
*
* Flags:
* NS_FRAME_NO_MOVE_FRAME - don't move the frame. aX and aY are ignored in this
* case. Also implies NS_FRAME_NO_MOVE_VIEW
* NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
* don't want to automatically sync the frame and view
* NS_FRAME_NO_SIZE_VIEW - don't size the frame's view
*/
nsresult
nsContainerFrame::FinishReflowChild(nsIFrame* aKidFrame,
nsPresContext* aPresContext,
const nsHTMLReflowState* aReflowState,
const nsHTMLReflowMetrics& aDesiredSize,
nscoord aX,
nscoord aY,
PRUint32 aFlags)
{
nsPoint curOrigin = aKidFrame->GetPosition();
nsRect bounds(aX, aY, aDesiredSize.width, aDesiredSize.height);
aKidFrame->SetRect(bounds);
if (aKidFrame->HasView()) {
nsIView* view = aKidFrame->GetView();
// Make sure the frame's view is properly sized and positioned and has
// things like opacity correct
SyncFrameViewAfterReflow(aPresContext, aKidFrame, view,
&aDesiredSize.mOverflowArea,
aFlags);
}
if (!(aFlags & NS_FRAME_NO_MOVE_VIEW) &&
(curOrigin.x != aX || curOrigin.y != aY)) {
if (!aKidFrame->HasView()) {
// If the frame has moved, then we need to make sure any child views are
// correctly positioned
PositionChildViews(aKidFrame);
}
// We also need to redraw everything associated with the frame
// because if the frame's Reflow issued any invalidates, then they
// will be at the wrong offset ... note that this includes
// invalidates issued against the frame's children, so we need to
// invalidate the overflow area too.
aKidFrame->Invalidate(aDesiredSize.mOverflowArea);
}
return aKidFrame->DidReflow(aPresContext, aReflowState, NS_FRAME_REFLOW_FINISHED);
}
nsresult
nsContainerFrame::ReflowOverflowContainerChildren(nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsRect& aOverflowRect,
PRUint32 aFlags,
nsReflowStatus& aStatus)
{
NS_PRECONDITION(aPresContext, "null pointer");
nsresult rv = NS_OK;
nsFrameList* overflowContainers =
GetPropTableFrames(aPresContext,
nsGkAtoms::overflowContainersProperty);
NS_ASSERTION(!(overflowContainers && GetPrevInFlow()
&& static_cast<nsContainerFrame*>(GetPrevInFlow())
->GetPropTableFrames(aPresContext,
nsGkAtoms::excessOverflowContainersProperty)),
"conflicting overflow containers lists");
if (!overflowContainers) {
// Drain excess from previnflow
nsContainerFrame* prev = (nsContainerFrame*) GetPrevInFlow();
if (prev) {
nsFrameList* excessFrames =
prev->RemovePropTableFrames(aPresContext,
nsGkAtoms::excessOverflowContainersProperty);
if (excessFrames) {
excessFrames->ApplySetParent(this);
nsHTMLContainerFrame::ReparentFrameViewList(aPresContext, *excessFrames,
prev, this);
overflowContainers = excessFrames;
rv = SetPropTableFrames(aPresContext, overflowContainers,
nsGkAtoms::overflowContainersProperty);
if (NS_FAILED(rv)) {
excessFrames->DestroyFrames();
delete excessFrames;
return rv;
}
}
}
}
if (!overflowContainers)
return NS_OK; // nothing to reflow
nsOverflowContinuationTracker tracker(aPresContext, this, PR_FALSE, PR_FALSE);
for (nsIFrame* frame = overflowContainers->FirstChild(); frame;
frame = frame->GetNextSibling()) {
if (frame->GetPrevInFlow()->GetParent() != GetPrevInFlow()) {
// frame's prevInFlow has moved, skip reflowing this frame;
// it will get reflowed once it's been placed
continue;
}
if (NS_SUBTREE_DIRTY(frame)) {
// Get prev-in-flow
nsIFrame* prevInFlow = frame->GetPrevInFlow();
NS_ASSERTION(prevInFlow,
"overflow container frame must have a prev-in-flow");
NS_ASSERTION(frame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER,
"overflow container frame must have overflow container bit set");
nsRect prevRect = prevInFlow->GetRect();
// Initialize reflow params
nsSize availSpace(prevRect.width, aReflowState.availableHeight);
nsHTMLReflowMetrics desiredSize;
nsHTMLReflowState frameState(aPresContext, aReflowState,
frame, availSpace);
nsReflowStatus frameStatus = NS_FRAME_COMPLETE;
// Cache old bounds
nsRect oldRect = frame->GetRect();
nsRect oldOverflow = frame->GetOverflowRect();
// Reflow
rv = ReflowChild(frame, aPresContext, desiredSize, frameState,
prevRect.x, 0, aFlags, frameStatus, &tracker);
NS_ENSURE_SUCCESS(rv, rv);
//XXXfr Do we need to override any shrinkwrap effects here?
// e.g. desiredSize.width = prevRect.width;
rv = FinishReflowChild(frame, aPresContext, &frameState, desiredSize,
prevRect.x, 0, aFlags);
NS_ENSURE_SUCCESS(rv, rv);
// Invalidate if there was a position or size change
nsRect rect = frame->GetRect();
if (rect != oldRect) {
nsRect dirtyRect = oldOverflow;
dirtyRect.MoveBy(oldRect.x, oldRect.y);
Invalidate(dirtyRect);
dirtyRect = frame->GetOverflowRect();
dirtyRect.MoveBy(rect.x, rect.y);
Invalidate(dirtyRect);
}
// Handle continuations
if (!NS_FRAME_IS_FULLY_COMPLETE(frameStatus)) {
if (frame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
// Abspos frames can't cause their parent to be incomplete,
// only overflow incomplete.
NS_FRAME_SET_OVERFLOW_INCOMPLETE(frameStatus);
}
else {
NS_ASSERTION(NS_FRAME_IS_COMPLETE(frameStatus),
"overflow container frames can't be incomplete, only overflow-incomplete");
}
// Acquire a next-in-flow, creating it if necessary
nsIFrame* nif = frame->GetNextInFlow();
if (!nif) {
NS_ASSERTION(frameStatus & NS_FRAME_REFLOW_NEXTINFLOW,
"Someone forgot a REFLOW_NEXTINFLOW flag");
rv = aPresContext->PresShell()->FrameConstructor()->
CreateContinuingFrame(aPresContext, frame, this, &nif);
NS_ENSURE_SUCCESS(rv, rv);
}
else if (!(nif->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
// used to be a normal next-in-flow; steal it from the child list
rv = static_cast<nsContainerFrame*>(nif->GetParent())
->StealFrame(aPresContext, nif);
NS_ENSURE_SUCCESS(rv, rv);
}
tracker.Insert(nif, frameStatus);
}
NS_MergeReflowStatusInto(&aStatus, frameStatus);
// At this point it would be nice to assert !frame->GetOverflowRect().IsEmpty(),
// but we have some unsplittable frames that, when taller than
// availableHeight will push zero-height content into a next-in-flow.
}
else {
tracker.Skip(frame, aStatus);
if (aReflowState.mFloatManager)
nsBlockFrame::RecoverFloatsFor(frame, *aReflowState.mFloatManager);
}
ConsiderChildOverflow(aOverflowRect, frame);
}
return NS_OK;
}
void
nsContainerFrame::DisplayOverflowContainers(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsFrameList* overflowconts = GetPropTableFrames(PresContext(),
nsGkAtoms::overflowContainersProperty);
if (overflowconts) {
for (nsIFrame* frame = overflowconts->FirstChild(); frame;
frame = frame->GetNextSibling()) {
BuildDisplayListForChild(aBuilder, frame, aDirtyRect, aLists);
}
}
}
nsresult
nsContainerFrame::StealFrame(nsPresContext* aPresContext,
nsIFrame* aChild,
PRBool aForceNormal)
{
PRBool removed = PR_TRUE;
if ((aChild->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)
&& !aForceNormal) {
// Try removing from the overflow container list
if (!RemovePropTableFrame(aPresContext, aChild,
nsGkAtoms::overflowContainersProperty)) {
// It must be in the excess overflow container list
removed = RemovePropTableFrame(aPresContext, aChild,
nsGkAtoms::excessOverflowContainersProperty);
}
}
else {
if (!mFrames.RemoveFrameIfPresent(aChild)) {
removed = PR_FALSE;
// We didn't find the child in the parent's principal child list.
// Maybe it's on the overflow list?
nsFrameList* frameList = GetOverflowFrames();
if (frameList) {
removed = frameList->RemoveFrameIfPresent(aChild);
if (frameList->IsEmpty()) {
DestroyOverflowList(aPresContext);
}
}
}
}
NS_POSTCONDITION(removed, "StealFrame: can't find aChild");
return removed ? NS_OK : NS_ERROR_UNEXPECTED;
}
nsFrameList
nsContainerFrame::StealFramesAfter(nsIFrame* aChild)
{
NS_ASSERTION(!aChild ||
!(aChild->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER),
"StealFramesAfter doesn't handle overflow containers");
NS_ASSERTION(GetType() != nsGkAtoms::blockFrame, "unexpected call");
if (!aChild) {
nsFrameList copy(mFrames);
mFrames.Clear();
return copy;
}
for (nsFrameList::FrameLinkEnumerator iter(mFrames); !iter.AtEnd();
iter.Next()) {
if (iter.PrevFrame() == aChild) {
return mFrames.ExtractTail(iter);
}
}
// We didn't find the child in the principal child list.
// Maybe it's on the overflow list?
nsFrameList* overflowFrames = GetOverflowFrames();
if (overflowFrames) {
for (nsFrameList::FrameLinkEnumerator iter(*overflowFrames); !iter.AtEnd();
iter.Next()) {
if (iter.PrevFrame() == aChild) {
return overflowFrames->ExtractTail(iter);
}
}
}
NS_ERROR("StealFramesAfter: can't find aChild");
return nsFrameList::EmptyList();
}
void
nsContainerFrame::DestroyOverflowList(nsPresContext* aPresContext,
nsIFrame* aDestructRoot)
{
nsFrameList* list =
RemovePropTableFrames(aPresContext, nsGkAtoms::overflowProperty);
if (list)
list->DestroyFrom(aDestructRoot);
}
/**
* Remove and delete aNextInFlow and its next-in-flows. Updates the sibling and flow
* pointers
*/
void
nsContainerFrame::DeleteNextInFlowChild(nsPresContext* aPresContext,
nsIFrame* aNextInFlow,
PRBool aDeletingEmptyFrames)
{
#ifdef DEBUG
nsIFrame* prevInFlow = aNextInFlow->GetPrevInFlow();
#endif
NS_PRECONDITION(prevInFlow, "bad prev-in-flow");
// If the next-in-flow has a next-in-flow then delete it, too (and
// delete it first).
// Do this in a loop so we don't overflow the stack for frames
// with very many next-in-flows
nsIFrame* nextNextInFlow = aNextInFlow->GetNextInFlow();
if (nextNextInFlow) {
nsAutoTArray<nsIFrame*, 8> frames;
for (nsIFrame* f = nextNextInFlow; f; f = f->GetNextInFlow()) {
frames.AppendElement(f);
}
for (PRInt32 i = frames.Length() - 1; i >= 0; --i) {
nsIFrame* delFrame = frames.ElementAt(i);
static_cast<nsContainerFrame*>(delFrame->GetParent())
->DeleteNextInFlowChild(aPresContext, delFrame, aDeletingEmptyFrames);
}
}
aNextInFlow->Invalidate(aNextInFlow->GetOverflowRect());
// Take the next-in-flow out of the parent's child list
#ifdef DEBUG
nsresult rv =
#endif
StealFrame(aPresContext, aNextInFlow);
NS_ASSERTION(NS_SUCCEEDED(rv), "StealFrame failure");
// Delete the next-in-flow frame and its descendants. This will also
// remove it from its next-in-flow/prev-in-flow chain.
aNextInFlow->Destroy();
NS_POSTCONDITION(!prevInFlow->GetNextInFlow(), "non null next-in-flow");
}
// Destructor function for the proptable-stored framelists
static void
DestroyFrameList(void* aFrame,
nsIAtom* aPropertyName,
void* aPropertyValue,
void* aDtorData)
{
if (aPropertyValue)
static_cast<nsFrameList*>(aPropertyValue)->Destroy();
}
/**
* Set the frames on the overflow list
*/
nsresult
nsContainerFrame::SetOverflowFrames(nsPresContext* aPresContext,
const nsFrameList& aOverflowFrames)
{
NS_PRECONDITION(aOverflowFrames.NotEmpty(), "Shouldn't be called");
nsFrameList* newList = new nsFrameList(aOverflowFrames);
if (!newList) {
// XXXbz should really destroy the frames here, but callers are holding
// pointers to them.... We should switch all callers to framelists, then
// audit and do that.
return NS_ERROR_OUT_OF_MEMORY;
}
nsresult rv =
aPresContext->PropertyTable()->SetProperty(this,
nsGkAtoms::overflowProperty,
newList,
DestroyFrameList,
nsnull);
if (NS_FAILED(rv)) {
newList->Destroy();
}
// Verify that we didn't overwrite an existing overflow list
NS_ASSERTION(rv != NS_PROPTABLE_PROP_OVERWRITTEN, "existing overflow list");
return rv;
}
nsFrameList*
nsContainerFrame::GetPropTableFrames(nsPresContext* aPresContext,
nsIAtom* aPropID) const
{
nsPropertyTable* propTable = aPresContext->PropertyTable();
return static_cast<nsFrameList*>(propTable->GetProperty(this, aPropID));
}
nsFrameList*
nsContainerFrame::RemovePropTableFrames(nsPresContext* aPresContext,
nsIAtom* aPropID) const
{
nsPropertyTable* propTable = aPresContext->PropertyTable();
return static_cast<nsFrameList*>(propTable->UnsetProperty(this, aPropID));
}
PRBool
nsContainerFrame::RemovePropTableFrame(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsIAtom* aPropID) const
{
nsFrameList* frameList = RemovePropTableFrames(aPresContext, aPropID);
if (!frameList) {
// No such list
return PR_FALSE;
}
if (!frameList->RemoveFrameIfPresent(aFrame)) {
// Found list, but it doesn't have the frame. Put list back.
SetPropTableFrames(aPresContext, frameList, aPropID);
return PR_FALSE;
}
if (frameList->IsEmpty()) {
// Removed frame and now list is empty. Delete it.
delete frameList;
}
else {
// Removed frame, but list not empty. Put it back.
SetPropTableFrames(aPresContext, frameList, aPropID);
}
return PR_TRUE;
}
nsresult
nsContainerFrame::SetPropTableFrames(nsPresContext* aPresContext,
nsFrameList* aFrameList,
nsIAtom* aPropID) const
{
NS_PRECONDITION(aPresContext && aPropID && aFrameList, "null ptr");
nsresult rv = aPresContext->PropertyTable()->SetProperty(this, aPropID,
aFrameList, DestroyFrameList, nsnull);
NS_ASSERTION(rv != NS_PROPTABLE_PROP_OVERWRITTEN, "existing framelist");
return rv;
}
/**
* Push aFromChild and its next siblings to the next-in-flow. Change the
* geometric parent of each frame that's pushed. If there is no next-in-flow
* the frames are placed on the overflow list (and the geometric parent is
* left unchanged).
*
* Updates the next-in-flow's child count. Does <b>not</b> update the
* pusher's child count.
*
* @param aFromChild the first child frame to push. It is disconnected from
* aPrevSibling
* @param aPrevSibling aFromChild's previous sibling. Must not be null. It's
* an error to push a parent's first child frame
*/
void
nsContainerFrame::PushChildren(nsPresContext* aPresContext,
nsIFrame* aFromChild,
nsIFrame* aPrevSibling)
{
NS_PRECONDITION(aFromChild, "null pointer");
NS_PRECONDITION(aPrevSibling, "pushing first child");
NS_PRECONDITION(aPrevSibling->GetNextSibling() == aFromChild, "bad prev sibling");
// Disconnect aFromChild from its previous sibling
nsFrameList tail = mFrames.RemoveFramesAfter(aPrevSibling);
nsContainerFrame* nextInFlow =
static_cast<nsContainerFrame*>(GetNextInFlow());
if (nextInFlow) {
// XXX This is not a very good thing to do. If it gets removed
// then remove the copy of this routine that doesn't do this from
// nsInlineFrame.
// When pushing and pulling frames we need to check for whether any
// views need to be reparented.
for (nsIFrame* f = aFromChild; f; f = f->GetNextSibling()) {
nsHTMLContainerFrame::ReparentFrameView(aPresContext, f, this, nextInFlow);
}
nextInFlow->mFrames.InsertFrames(nextInFlow, nsnull, tail);
}
else {
// Add the frames to our overflow list
SetOverflowFrames(aPresContext, tail);
}
}
/**
* Moves any frames on the overflow lists (the prev-in-flow's overflow list and
* the receiver's overflow list) to the child list.
*
* Updates this frame's child count and content mapping.
*
* @return PR_TRUE if any frames were moved and PR_FALSE otherwise
*/
PRBool
nsContainerFrame::MoveOverflowToChildList(nsPresContext* aPresContext)
{
PRBool result = PR_FALSE;
// Check for an overflow list with our prev-in-flow
nsContainerFrame* prevInFlow = (nsContainerFrame*)GetPrevInFlow();
if (nsnull != prevInFlow) {
nsAutoPtr<nsFrameList> prevOverflowFrames(prevInFlow->StealOverflowFrames());
if (prevOverflowFrames) {
// Tables are special; they can have repeated header/footer
// frames on mFrames at this point.
NS_ASSERTION(mFrames.IsEmpty() || GetType() == nsGkAtoms::tableFrame,
"bad overflow list");
// When pushing and pulling frames we need to check for whether any
// views need to be reparented.
nsHTMLContainerFrame::ReparentFrameViewList(aPresContext,
*prevOverflowFrames,
prevInFlow, this);
mFrames.AppendFrames(this, *prevOverflowFrames);
result = PR_TRUE;
}
}
// It's also possible that we have an overflow list for ourselves
nsAutoPtr<nsFrameList> overflowFrames(StealOverflowFrames());
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
mFrames.AppendFrames(nsnull, *overflowFrames);
result = PR_TRUE;
}
return result;
}
nsOverflowContinuationTracker::nsOverflowContinuationTracker(nsPresContext* aPresContext,
nsContainerFrame* aFrame,
PRBool aWalkOOFFrames,
PRBool aSkipOverflowContainerChildren)
: mOverflowContList(nsnull),
mPrevOverflowCont(nsnull),
mSentry(nsnull),
mParent(aFrame),
mSkipOverflowContainerChildren(aSkipOverflowContainerChildren),
mWalkOOFFrames(aWalkOOFFrames)
{
NS_PRECONDITION(aFrame, "null frame pointer");
nsContainerFrame* next = static_cast<nsContainerFrame*>
(aFrame->GetNextInFlow());
if (next) {
mOverflowContList =
next->GetPropTableFrames(aPresContext,
nsGkAtoms::overflowContainersProperty);
if (mOverflowContList) {
mParent = next;
SetUpListWalker();
}
}
if (!mOverflowContList) {
mOverflowContList =
mParent->GetPropTableFrames(aPresContext,
nsGkAtoms::excessOverflowContainersProperty);
if (mOverflowContList) {
SetUpListWalker();
}
}
}
/**
* Helper function to walk past overflow continuations whose prev-in-flow
* isn't a normal child and to set mSentry and mPrevOverflowCont correctly.
*/
void
nsOverflowContinuationTracker::SetUpListWalker()
{
NS_ASSERTION(!mSentry && !mPrevOverflowCont,
"forgot to reset mSentry or mPrevOverflowCont");
if (mOverflowContList) {
nsIFrame* cur = mOverflowContList->FirstChild();
if (mSkipOverflowContainerChildren) {
while (cur && (cur->GetPrevInFlow()->GetStateBits()
& NS_FRAME_IS_OVERFLOW_CONTAINER)) {
mPrevOverflowCont = cur;
cur = cur->GetNextSibling();
}
while (cur && (!(cur->GetStateBits() & NS_FRAME_OUT_OF_FLOW)
== mWalkOOFFrames)) {
mPrevOverflowCont = cur;
cur = cur->GetNextSibling();
}
}
if (cur) {
mSentry = cur->GetPrevInFlow();
}
}
}
/**
* Helper function to step forward through the overflow continuations list.
* Sets mSentry and mPrevOverflowCont, skipping over OOF or non-OOF frames
* as appropriate. May only be called when we have already set up an
* mOverflowContList; mOverflowContList cannot be null.
*/
void
nsOverflowContinuationTracker::StepForward()
{
NS_PRECONDITION(mOverflowContList, "null list");
// Step forward
if (mPrevOverflowCont) {
mPrevOverflowCont = mPrevOverflowCont->GetNextSibling();
}
else {
mPrevOverflowCont = mOverflowContList->FirstChild();
}
// Skip over oof or non-oof frames as appropriate
if (mSkipOverflowContainerChildren) {
nsIFrame* cur = mPrevOverflowCont->GetNextSibling();
while (cur && (!(cur->GetStateBits() & NS_FRAME_OUT_OF_FLOW)
== mWalkOOFFrames)) {
mPrevOverflowCont = cur;
cur = cur->GetNextSibling();
}
}
// Set up the sentry
mSentry = (mPrevOverflowCont->GetNextSibling())
? mPrevOverflowCont->GetNextSibling()->GetPrevInFlow()
: nsnull;
}
nsresult
nsOverflowContinuationTracker::Insert(nsIFrame* aOverflowCont,
nsReflowStatus& aReflowStatus)
{
NS_PRECONDITION(aOverflowCont, "null frame pointer");
NS_PRECONDITION(!mSkipOverflowContainerChildren || mWalkOOFFrames ==
!!(aOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW),
"shouldn't insert frame that doesn't match walker type");
NS_PRECONDITION(aOverflowCont->GetPrevInFlow(),
"overflow containers must have a prev-in-flow");
nsresult rv = NS_OK;
PRBool convertedToOverflowContainer = PR_FALSE;
nsPresContext* presContext = aOverflowCont->PresContext();
if (!mSentry || aOverflowCont != mSentry->GetNextInFlow()) {
// Not in our list, so we need to add it
if (aOverflowCont->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
// aOverflowCont is in some other overflow container list,
// steal it first
NS_ASSERTION(!(mOverflowContList &&
mOverflowContList->ContainsFrame(aOverflowCont)),
"overflow containers out of order");
rv = static_cast<nsContainerFrame*>(aOverflowCont->GetParent())
->StealFrame(presContext, aOverflowCont);
NS_ENSURE_SUCCESS(rv, rv);
}
else {
aOverflowCont->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
convertedToOverflowContainer = PR_TRUE;
}
if (!mOverflowContList) {
mOverflowContList = new nsFrameList();
rv = mParent->SetPropTableFrames(presContext,
mOverflowContList, nsGkAtoms::excessOverflowContainersProperty);
NS_ENSURE_SUCCESS(rv, rv);
SetUpListWalker();
}
if (aOverflowCont->GetParent() != mParent) {
nsHTMLContainerFrame::ReparentFrameView(presContext, aOverflowCont,
aOverflowCont->GetParent(),
mParent);
}
mOverflowContList->InsertFrame(mParent, mPrevOverflowCont, aOverflowCont);
aReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
}
// If we need to reflow it, mark it dirty
if (aReflowStatus & NS_FRAME_REFLOW_NEXTINFLOW)
aOverflowCont->AddStateBits(NS_FRAME_IS_DIRTY);
// It's in our list, just step forward
StepForward();
NS_ASSERTION(mPrevOverflowCont == aOverflowCont ||
(mSkipOverflowContainerChildren &&
(mPrevOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW) !=
(aOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW)),
"OverflowContTracker in unexpected state");
if (convertedToOverflowContainer) {
// Convert all non-overflow-container continuations of aOverflowCont
// into overflow containers and move them to our overflow
// tracker. This preserves the invariant that the next-continuations
// of an overflow container are also overflow containers.
nsIFrame* f = aOverflowCont->GetNextContinuation();
if (f && !(f->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
nsContainerFrame* parent = static_cast<nsContainerFrame*>(f->GetParent());
rv = parent->StealFrame(presContext, f);
NS_ENSURE_SUCCESS(rv, rv);
Insert(f, aReflowStatus);
}
}
return rv;
}
void
nsOverflowContinuationTracker::Finish(nsIFrame* aChild)
{
NS_PRECONDITION(aChild, "null ptr");
NS_PRECONDITION(aChild->GetNextInFlow(),
"supposed to call Finish *before* deleting next-in-flow!");
for (nsIFrame* f = aChild; f; f = f->GetNextInFlow()) {
if (f == mSentry) {
// Make sure we drop all references if this was the only frame
// in the overflow containers list
if (mOverflowContList->FirstChild() == f->GetNextInFlow()
&& !f->GetNextInFlow()->GetNextSibling()) {
mOverflowContList = nsnull;
mPrevOverflowCont = nsnull;
mSentry = nsnull;
mParent = static_cast<nsContainerFrame*>(f->GetParent());
break;
}
else {
// Step past aChild
nsIFrame* prevOverflowCont = mPrevOverflowCont;
StepForward();
if (mPrevOverflowCont == f->GetNextInFlow()) {
// Pull mPrevOverflowChild back to aChild's prevSibling:
// aChild will be removed from our list by our caller
mPrevOverflowCont = prevOverflowCont;
}
}
}
}
}
/////////////////////////////////////////////////////////////////////////////
// Debugging
#ifdef NS_DEBUG
NS_IMETHODIMP
nsContainerFrame::List(FILE* out, PRInt32 aIndent) const
{
IndentBy(out, aIndent);
ListTag(out);
#ifdef DEBUG_waterson
fprintf(out, " [parent=%p]", static_cast<void*>(mParent));
#endif
if (HasView()) {
fprintf(out, " [view=%p]", static_cast<void*>(GetView()));
}
if (GetNextSibling()) {
fprintf(out, " next=%p", static_cast<void*>(GetNextSibling()));
}
if (nsnull != GetPrevContinuation()) {
fprintf(out, " prev-continuation=%p", static_cast<void*>(GetPrevContinuation()));
}
if (nsnull != GetNextContinuation()) {
fprintf(out, " next-continuation=%p", static_cast<void*>(GetNextContinuation()));
}
void* IBsibling = GetProperty(nsGkAtoms::IBSplitSpecialSibling);
if (IBsibling) {
fprintf(out, " IBSplitSpecialSibling=%p", IBsibling);
}
void* IBprevsibling = GetProperty(nsGkAtoms::IBSplitSpecialPrevSibling);
if (IBprevsibling) {
fprintf(out, " IBSplitSpecialPrevSibling=%p", IBprevsibling);
}
fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
if (0 != mState) {
fprintf(out, " [state=%08x]", mState);
}
fprintf(out, " [content=%p]", static_cast<void*>(mContent));
nsContainerFrame* f = const_cast<nsContainerFrame*>(this);
if (f->HasOverflowRect()) {
nsRect overflowArea = f->GetOverflowRect();
fprintf(out, " [overflow=%d,%d,%d,%d]", overflowArea.x, overflowArea.y,
overflowArea.width, overflowArea.height);
}
fprintf(out, " [sc=%p]", static_cast<void*>(mStyleContext));
nsIAtom* pseudoTag = mStyleContext->GetPseudo();
if (pseudoTag) {
nsAutoString atomString;
pseudoTag->ToString(atomString);
fprintf(out, " pst=%s",
NS_LossyConvertUTF16toASCII(atomString).get());
}
// Output the children
nsIAtom* listName = nsnull;
PRInt32 listIndex = 0;
PRBool outputOneList = PR_FALSE;
do {
nsIFrame* kid = GetFirstChild(listName);
if (nsnull != kid) {
if (outputOneList) {
IndentBy(out, aIndent);
}
outputOneList = PR_TRUE;
nsAutoString tmp;
if (nsnull != listName) {
listName->ToString(tmp);
fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
}
fputs("<\n", out);
while (nsnull != kid) {
// Verify the child frame's parent frame pointer is correct
NS_ASSERTION(kid->GetParent() == (nsIFrame*)this, "bad parent frame pointer");
// Have the child frame list
kid->List(out, aIndent + 1);
kid = kid->GetNextSibling();
}
IndentBy(out, aIndent);
fputs(">\n", out);
}
listName = GetAdditionalChildListName(listIndex++);
} while(nsnull != listName);
if (!outputOneList) {
fputs("<>\n", out);
}
return NS_OK;
}
#endif
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