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nsCSSFrameConstructor.cpp
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nsCSSFrameConstructor.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=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):
* Dan Rosen <dr@netscape.com>
* Mats Palmgren <mats.palmgren@bredband.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 ***** */
/*
* construction of a frame tree that is nearly isomorphic to the content
* tree and updating of that tree in response to dynamic changes
*/
#include "nsCSSFrameConstructor.h"
#include "nsCRT.h"
#include "nsIAtom.h"
#include "nsIURL.h"
#include "nsHashtable.h"
#include "nsIHTMLDocument.h"
#include "nsIStyleRule.h"
#include "nsIFrame.h"
#include "nsGkAtoms.h"
#include "nsPresContext.h"
#include "nsILinkHandler.h"
#include "nsIDocument.h"
#include "nsTableFrame.h"
#include "nsTableColGroupFrame.h"
#include "nsTableColFrame.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMHTMLTableColElement.h"
#include "nsIDOMHTMLTableCaptionElem.h"
#include "nsHTMLParts.h"
#include "nsIPresShell.h"
#include "nsStyleSet.h"
#include "nsIViewManager.h"
#include "nsIEventStateManager.h"
#include "nsIScrollableView.h"
#include "nsStyleConsts.h"
#include "nsTableOuterFrame.h"
#include "nsIDOMXULElement.h"
#include "nsHTMLContainerFrame.h"
#include "nsINameSpaceManager.h"
#include "nsIDOMHTMLSelectElement.h"
#include "nsIDOMHTMLLegendElement.h"
#include "nsIComboboxControlFrame.h"
#include "nsIListControlFrame.h"
#include "nsISelectControlFrame.h"
#include "nsIRadioControlFrame.h"
#include "nsICheckboxControlFrame.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMHTMLImageElement.h"
#include "nsPlaceholderFrame.h"
#include "nsTableRowGroupFrame.h"
#include "nsStyleChangeList.h"
#include "nsIFormControl.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSPseudoElements.h"
#include "nsIDeviceContext.h"
#include "nsTextFragment.h"
#include "nsIAnonymousContentCreator.h"
#include "nsFrameManager.h"
#include "nsLegendFrame.h"
#include "nsIContentIterator.h"
#include "nsBoxLayoutState.h"
#include "nsBindingManager.h"
#include "nsXBLBinding.h"
#include "nsITheme.h"
#include "nsContentCID.h"
#include "nsContentUtils.h"
#include "nsIScriptError.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeItem.h"
#include "nsObjectFrame.h"
#include "nsRuleNode.h"
#include "nsIDOMMutationEvent.h"
#include "nsChildIterator.h"
#include "nsCSSRendering.h"
#include "nsISelectElement.h"
#include "nsLayoutErrors.h"
#include "nsLayoutUtils.h"
#include "nsAutoPtr.h"
#include "nsBoxFrame.h"
#include "nsIBoxLayout.h"
#include "nsImageFrame.h"
#include "nsIObjectLoadingContent.h"
#include "nsContentErrors.h"
#include "nsIPrincipal.h"
#include "nsIDOMWindowInternal.h"
#include "nsStyleUtil.h"
#include "nsBox.h"
#include "nsTArray.h"
#include "nsGenericDOMDataNode.h"
#ifdef MOZ_XUL
#include "nsIRootBox.h"
#include "nsIDOMXULCommandDispatcher.h"
#include "nsIDOMXULDocument.h"
#include "nsIXULDocument.h"
#endif
#ifdef ACCESSIBILITY
#include "nsIAccessibilityService.h"
#include "nsIAccessibleEvent.h"
#endif
#include "nsInlineFrame.h"
#include "nsBlockFrame.h"
#include "nsIScrollableFrame.h"
#include "nsIXBLService.h"
#undef NOISY_FIRST_LETTER
#ifdef MOZ_MATHML
#include "nsMathMLParts.h"
#endif
#ifdef MOZ_SVG
#include "nsSVGFeatures.h"
#include "nsSVGEffects.h"
#include "nsSVGUtils.h"
#include "nsSVGOuterSVGFrame.h"
#endif
nsIFrame*
NS_NewHTMLCanvasFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
#if defined(MOZ_MEDIA)
nsIFrame*
NS_NewHTMLVideoFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
#endif
#ifdef MOZ_SVG
#include "nsSVGTextContainerFrame.h"
PRBool
NS_SVGEnabled();
nsIFrame*
NS_NewSVGOuterSVGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGInnerSVGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGPathGeometryFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGGenericContainerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGForeignObjectFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGAFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGGlyphFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGSwitchFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGTextFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGTSpanFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGContainerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGUseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
extern nsIFrame*
NS_NewSVGLinearGradientFrame(nsIPresShell *aPresShell, nsStyleContext* aContext);
extern nsIFrame*
NS_NewSVGRadialGradientFrame(nsIPresShell *aPresShell, nsStyleContext* aContext);
extern nsIFrame*
NS_NewSVGStopFrame(nsIPresShell *aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGMarkerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
extern nsIFrame*
NS_NewSVGImageFrame(nsIPresShell *aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGTextPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGFilterFrame(nsIPresShell *aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGPatternFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSVGLeafFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
#endif
#include "nsIDocument.h"
#include "nsIDOMElement.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMDocument.h"
#include "nsIDOMDocumentXBL.h"
#include "nsIScrollable.h"
#include "nsINodeInfo.h"
#include "prenv.h"
#include "nsWidgetsCID.h"
#include "nsNodeInfoManager.h"
#include "nsContentCreatorFunctions.h"
#include "nsIServiceManager.h"
// Global object maintenance
nsIXBLService * nsCSSFrameConstructor::gXBLService = nsnull;
#ifdef DEBUG
// Set the environment variable GECKO_FRAMECTOR_DEBUG_FLAGS to one or
// more of the following flags (comma separated) for handy debug
// output.
static PRBool gNoisyContentUpdates = PR_FALSE;
static PRBool gReallyNoisyContentUpdates = PR_FALSE;
static PRBool gNoisyInlineConstruction = PR_FALSE;
static PRBool gVerifyFastFindFrame = PR_FALSE;
struct FrameCtorDebugFlags {
const char* name;
PRBool* on;
};
static FrameCtorDebugFlags gFlags[] = {
{ "content-updates", &gNoisyContentUpdates },
{ "really-noisy-content-updates", &gReallyNoisyContentUpdates },
{ "noisy-inline", &gNoisyInlineConstruction },
{ "fast-find-frame", &gVerifyFastFindFrame }
};
#define NUM_DEBUG_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
#endif
#ifdef MOZ_XUL
#include "nsMenuFrame.h"
#include "nsPopupSetFrame.h"
#include "nsTreeColFrame.h"
#include "nsIBoxObject.h"
#include "nsPIListBoxObject.h"
#include "nsListBoxBodyFrame.h"
#include "nsListItemFrame.h"
#include "nsXULLabelFrame.h"
//------------------------------------------------------------------
nsIFrame*
NS_NewAutoRepeatBoxFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewRootBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewDocElementBoxFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewThumbFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewDeckFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewLeafBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewStackFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewProgressMeterFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewImageBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewTextBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewGroupBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewButtonBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewSplitterFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewMenuPopupFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewPopupSetFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewMenuFrame (nsIPresShell* aPresShell, nsStyleContext* aContext, PRUint32 aFlags);
nsIFrame*
NS_NewMenuBarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewTreeBodyFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
// grid
nsresult
NS_NewGridLayout2 ( nsIPresShell* aPresShell, nsIBoxLayout** aNewLayout );
nsIFrame*
NS_NewGridRowLeafFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewGridRowGroupFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
// end grid
nsIFrame*
NS_NewTitleBarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewResizerFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
#endif
nsIFrame*
NS_NewHTMLScrollFrame (nsIPresShell* aPresShell, nsStyleContext* aContext, PRBool aIsRoot);
nsIFrame*
NS_NewXULScrollFrame (nsIPresShell* aPresShell, nsStyleContext* aContext, PRBool aIsRoot);
nsIFrame*
NS_NewSliderFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewScrollbarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
nsIFrame*
NS_NewScrollbarButtonFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);
#ifdef NOISY_FINDFRAME
static PRInt32 FFWC_totalCount=0;
static PRInt32 FFWC_doLoop=0;
static PRInt32 FFWC_doSibling=0;
static PRInt32 FFWC_recursions=0;
static PRInt32 FFWC_nextInFlows=0;
#endif
static nsresult
DeletingFrameSubtree(nsFrameManager* aFrameManager,
nsIFrame* aFrame);
static inline nsIFrame*
GetFieldSetBlockFrame(nsIFrame* aFieldsetFrame)
{
// Depends on the fieldset child frame order - see ConstructFieldSetFrame() below.
nsIFrame* firstChild = aFieldsetFrame->GetFirstChild(nsnull);
return firstChild && firstChild->GetNextSibling() ? firstChild->GetNextSibling() : firstChild;
}
//----------------------------------------------------------------------
static PRBool
IsInlineOutside(nsIFrame* aFrame)
{
return aFrame->GetStyleDisplay()->IsInlineOutside();
}
/**
* True if aFrame is an actual inline frame in the sense of non-replaced
* display:inline CSS boxes. In other words, it can be affected by {ib}
* splitting and can contain first-letter frames. Basically, this is either an
* inline frame (positioned or otherwise) or an line frame (this last because
* it can contain first-letter and because inserting blocks in the middle of it
* needs to terminate it).
*/
static PRBool
IsInlineFrame(const nsIFrame* aFrame)
{
return aFrame->IsFrameOfType(nsIFrame::eLineParticipant);
}
/**
* If any children require a block parent, return the first such child.
* Otherwise return null.
*/
static nsIContent*
AnyKidsNeedBlockParent(nsIFrame *aFrameList)
{
for (nsIFrame *k = aFrameList; k; k = k->GetNextSibling()) {
// Line participants, such as text and inline frames, can't be
// directly inside a XUL box; they must be wrapped in an
// intermediate block.
if (k->IsFrameOfType(nsIFrame::eLineParticipant)) {
return k->GetContent();
}
}
return nsnull;
}
// Reparent a frame into a wrapper frame that is a child of its old parent.
static void
ReparentFrame(nsFrameManager* aFrameManager,
nsIFrame* aNewParentFrame,
nsIFrame* aFrame)
{
aFrame->SetParent(aNewParentFrame);
aFrameManager->ReParentStyleContext(aFrame);
if (aFrame->GetStateBits() &
(NS_FRAME_HAS_VIEW | NS_FRAME_HAS_CHILD_WITH_VIEW)) {
// No need to walk up the tree, since the bits are already set
// right on the parent of aNewParentFrame.
NS_ASSERTION(aNewParentFrame->GetParent()->GetStateBits() &
NS_FRAME_HAS_CHILD_WITH_VIEW,
"aNewParentFrame's parent should have this bit set!");
aNewParentFrame->AddStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW);
}
}
//----------------------------------------------------------------------
//
// When inline frames get weird and have block frames in them, we
// annotate them to help us respond to incremental content changes
// more easily.
static inline PRBool
IsFrameSpecial(nsIFrame* aFrame)
{
return (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL) != 0;
}
static nsIFrame* GetSpecialSibling(nsIFrame* aFrame)
{
// We only store the "special sibling" annotation with the first
// frame in the continuation chain. Walk back to find that frame now.
aFrame = aFrame->GetFirstContinuation();
void* value = aFrame->GetProperty(nsGkAtoms::IBSplitSpecialSibling);
return static_cast<nsIFrame*>(value);
}
static nsIFrame*
GetIBSplitSpecialPrevSiblingForAnonymousBlock(nsIFrame* aFrame)
{
NS_PRECONDITION(IsFrameSpecial(aFrame) && !IsInlineFrame(aFrame),
"Shouldn't call this");
// We only store the "special sibling" annotation with the first
// frame in the continuation chain. Walk back to find that frame now.
return
static_cast<nsIFrame*>
(aFrame->GetFirstContinuation()->
GetProperty(nsGkAtoms::IBSplitSpecialPrevSibling));
}
static nsIFrame*
GetLastSpecialSibling(nsIFrame* aFrame, PRBool aIgnoreEmpty)
{
for (nsIFrame *frame = aFrame, *next; ; frame = next) {
next = GetSpecialSibling(frame);
if (!next ||
(aIgnoreEmpty && !next->GetFirstChild(nsnull)))
return frame;
}
NS_NOTREACHED("unreachable code");
return nsnull;
}
static void
SetFrameIsSpecial(nsIFrame* aFrame, nsIFrame* aSpecialSibling)
{
NS_PRECONDITION(aFrame, "bad args!");
// Mark the frame and all of its siblings as "special".
for (nsIFrame* frame = aFrame; frame != nsnull; frame = frame->GetNextContinuation()) {
frame->AddStateBits(NS_FRAME_IS_SPECIAL);
}
if (aSpecialSibling) {
// We should be the first continuation
NS_ASSERTION(!aFrame->GetPrevContinuation(),
"assigning special sibling to other than first continuation!");
// Store the "special sibling" (if we were given one) with the
// first frame in the flow.
aFrame->SetProperty(nsGkAtoms::IBSplitSpecialSibling, aSpecialSibling);
}
}
static nsIFrame*
GetIBContainingBlockFor(nsIFrame* aFrame)
{
NS_PRECONDITION(IsFrameSpecial(aFrame),
"GetIBContainingBlockFor() should only be called on known IB frames");
// Get the first "normal" ancestor of the target frame.
nsIFrame* parentFrame;
do {
parentFrame = aFrame->GetParent();
if (! parentFrame) {
NS_ERROR("no unsplit block frame in IB hierarchy");
return aFrame;
}
// Note that we ignore non-special frames which have a pseudo on their
// style context -- they're not the frames we're looking for! In
// particular, they may be hiding a real parent that _is_ special.
if (!IsFrameSpecial(parentFrame) &&
!parentFrame->GetStyleContext()->GetPseudoType())
break;
aFrame = parentFrame;
} while (1);
// post-conditions
NS_ASSERTION(parentFrame, "no normal ancestor found for special frame in GetIBContainingBlockFor");
NS_ASSERTION(parentFrame != aFrame, "parentFrame is actually the child frame - bogus reslt");
return parentFrame;
}
//----------------------------------------------------------------------
// Block/inline frame construction logic. We maintain a few invariants here:
//
// 1. Block frames contain block and inline frames.
//
// 2. Inline frames only contain inline frames. If an inline parent has a block
// child then the block child is migrated upward until it lands in a block
// parent (the inline frames containing block is where it will end up).
static nsIFrame*
FindFirstBlock(nsIFrame* aKid, nsIFrame** aPrevKid)
{
nsIFrame* prevKid = nsnull;
while (aKid) {
if (!IsInlineOutside(aKid)) {
*aPrevKid = prevKid;
return aKid;
}
prevKid = aKid;
aKid = aKid->GetNextSibling();
}
*aPrevKid = nsnull;
return nsnull;
}
static nsIFrame*
FindLastBlock(nsIFrame* aKid)
{
nsIFrame* lastBlock = nsnull;
while (aKid) {
if (!IsInlineOutside(aKid)) {
lastBlock = aKid;
}
aKid = aKid->GetNextSibling();
}
return lastBlock;
}
/*
* The special-prev-sibling is useful for
* finding the "special parent" of a frame (i.e., a frame from which a
* good parent style context can be obtained), one looks at the
* special previous sibling annotation of the real parent of the frame
* (if the real parent has NS_FRAME_IS_SPECIAL).
*/
inline void
MarkIBSpecialPrevSibling(nsIFrame *aAnonymousFrame,
nsIFrame *aSpecialParent)
{
aAnonymousFrame->SetProperty(nsGkAtoms::IBSplitSpecialPrevSibling,
aSpecialParent, nsnull, nsnull);
}
// -----------------------------------------------------------
static PRBool
IsOutOfFlowList(nsIAtom* aListName)
{
return
aListName == nsGkAtoms::floatList ||
aListName == nsGkAtoms::absoluteList ||
aListName == nsGkAtoms::overflowOutOfFlowList ||
aListName == nsGkAtoms::fixedList;
}
// Helper function that recursively removes content to frame mappings and
// undisplayed content mappings.
// This differs from DeletingFrameSubtree() because the frames have not yet been
// added to the frame hierarchy.
// XXXbz it would really help if we merged the two methods somehow... :(
static void
DoCleanupFrameReferences(nsFrameManager* aFrameManager,
nsIFrame* aFrameIn)
{
nsIContent* content = aFrameIn->GetContent();
if (aFrameIn->GetType() == nsGkAtoms::placeholderFrame) {
nsPlaceholderFrame* placeholder = static_cast<nsPlaceholderFrame*>
(aFrameIn);
// if the frame is a placeholder use the out of flow frame
aFrameIn = nsPlaceholderFrame::GetRealFrameForPlaceholder(placeholder);
// And don't forget to unregister the placeholder mapping. Note that this
// means it's the caller's responsibility to actually destroy the
// out-of-flow pointed to by the placeholder, since after this point the
// out-of-flow is not reachable via the placeholder.
aFrameManager->UnregisterPlaceholderFrame(placeholder);
}
// Remove the mapping from the content object to its frame
aFrameManager->RemoveAsPrimaryFrame(content, aFrameIn);
aFrameManager->ClearAllUndisplayedContentIn(content);
// Recursively walk the child frames.
nsIAtom* childListName = nsnull;
PRInt32 childListIndex = 0;
do {
nsIFrame* childFrame = aFrameIn->GetFirstChild(childListName);
while (childFrame) {
DoCleanupFrameReferences(aFrameManager, childFrame);
// Get the next sibling child frame
childFrame = childFrame->GetNextSibling();
}
childListName = aFrameIn->GetAdditionalChildListName(childListIndex++);
} while (childListName);
}
// Helper function that walks a frame list and calls DoCleanupFrameReference()
static void
CleanupFrameReferences(nsFrameManager* aFrameManager,
nsIFrame* aFrameList)
{
while (aFrameList) {
DoCleanupFrameReferences(aFrameManager, aFrameList);
// Get the sibling frame
aFrameList = aFrameList->GetNextSibling();
}
}
// -----------------------------------------------------------
// Structure used when constructing formatting object trees.
struct nsFrameItems {
nsIFrame* childList;
nsIFrame* lastChild;
nsFrameItems(nsIFrame* aFrame = nsnull);
// Appends the frame to the end of the list
void AddChild(nsIFrame* aChild);
// Inserts the frame somewhere in the list
void InsertChildAfter(nsIFrame* aChild, nsIFrame* aAfter);
// Remove the frame from the list, return PR_FALSE if not found. If
// aPrevSibling is given, it must have aChild as its GetNextSibling().
// aPrevSibling may be null to indicate that the list should be searched.
PRBool RemoveChild(nsIFrame* aChild, nsIFrame* aPrevSibling);
};
nsFrameItems::nsFrameItems(nsIFrame* aFrame)
: childList(aFrame), lastChild(aFrame)
{
}
void
nsFrameItems::AddChild(nsIFrame* aChild)
{
#ifdef DEBUG
nsIFrame* oldLastChild = lastChild;
#endif
if (childList == nsnull) {
childList = lastChild = aChild;
}
else
{
NS_ASSERTION(aChild != lastChild,
"Same frame being added to frame list twice?");
lastChild->SetNextSibling(aChild);
lastChild = aChild;
}
// if aChild has siblings, lastChild needs to be the last one
for (nsIFrame* sib = lastChild->GetNextSibling(); sib;
sib = sib->GetNextSibling()) {
NS_ASSERTION(oldLastChild != sib, "Loop in frame list");
lastChild = sib;
}
}
void
nsFrameItems::InsertChildAfter(nsIFrame* aChild, nsIFrame* aAfter)
{
if (!childList || (aAfter && !aAfter->GetNextSibling())) {
// Appending to the end of the list
AddChild(aChild);
return;
}
if (!aAfter) {
// Inserting at beginning of list
aChild->SetNextSibling(childList);
childList = aChild;
return;
}
aChild->SetNextSibling(aAfter->GetNextSibling());
aAfter->SetNextSibling(aChild);
}
PRBool
nsFrameItems::RemoveChild(nsIFrame* aFrame, nsIFrame* aPrevSibling)
{
NS_PRECONDITION(aFrame, "null ptr");
nsIFrame* prev;
if (aPrevSibling) {
prev = aPrevSibling;
} else {
prev = nsnull;
nsIFrame* sib;
for (sib = childList; sib && sib != aFrame; sib = sib->GetNextSibling()) {
prev = sib;
}
if (!sib) {
return PR_FALSE;
}
}
NS_ASSERTION(!prev || prev->GetNextSibling() == aFrame,
"Unexpected prevsibling");
if (aFrame == childList) {
childList = aFrame->GetNextSibling();
} else {
prev->SetNextSibling(aFrame->GetNextSibling());
}
if (aFrame == lastChild) {
lastChild = prev;
}
aFrame->SetNextSibling(nsnull);
return PR_TRUE;
}
// -----------------------------------------------------------
// Structure used when constructing formatting object trees. Contains
// state information needed for absolutely positioned elements
struct nsAbsoluteItems : nsFrameItems {
// containing block for absolutely positioned elements
nsIFrame* containingBlock;
nsAbsoluteItems(nsIFrame* aContainingBlock);
#ifdef DEBUG
// XXXbz Does this need a debug-only assignment operator that nulls out the
// childList in the nsAbsoluteItems we're copying? Introducing a difference
// between debug and non-debug behavior seems bad, so I guess not...
~nsAbsoluteItems() {
NS_ASSERTION(!childList,
"Dangling child list. Someone forgot to insert it?");
}
#endif
// Appends the frame to the end of the list
void AddChild(nsIFrame* aChild);
};
nsAbsoluteItems::nsAbsoluteItems(nsIFrame* aContainingBlock)
: containingBlock(aContainingBlock)
{
}
// Additional behavior is that it sets the frame's NS_FRAME_OUT_OF_FLOW flag
void
nsAbsoluteItems::AddChild(nsIFrame* aChild)
{
NS_ASSERTION(aChild->PresContext()->FrameManager()->
GetPlaceholderFrameFor(aChild),
"Child without placeholder being added to nsAbsoluteItems?");
aChild->AddStateBits(NS_FRAME_OUT_OF_FLOW);
nsFrameItems::AddChild(aChild);
}
// -----------------------------------------------------------
// Structure for saving the existing state when pushing/poping containing
// blocks. The destructor restores the state to its previous state
class NS_STACK_CLASS nsFrameConstructorSaveState {
public:
nsFrameConstructorSaveState();
~nsFrameConstructorSaveState();
private:
nsAbsoluteItems* mItems; // pointer to struct whose data we save/restore
PRPackedBool* mFixedPosIsAbsPos;
nsAbsoluteItems mSavedItems; // copy of original data
PRPackedBool mSavedFixedPosIsAbsPos;
// The name of the child list in which our frames would belong
nsIAtom* mChildListName;
nsFrameConstructorState* mState;
friend class nsFrameConstructorState;
};
// Structure used for maintaining state information during the
// frame construction process
class NS_STACK_CLASS nsFrameConstructorState {
public:
nsPresContext *mPresContext;
nsIPresShell *mPresShell;
nsFrameManager *mFrameManager;
#ifdef MOZ_XUL
// Frames destined for the nsGkAtoms::popupList.
nsAbsoluteItems mPopupItems;
#endif
// Containing block information for out-of-flow frames.
nsAbsoluteItems mFixedItems;
nsAbsoluteItems mAbsoluteItems;
nsAbsoluteItems mFloatedItems;
nsCOMPtr<nsILayoutHistoryState> mFrameState;
// These bits will be added to the state bits of any frame we construct
// using this state.
nsFrameState mAdditionalStateBits;
// When working with the -moz-transform property, we want to hook
// the abs-pos and fixed-pos lists together, since transformed
// elements are fixed-pos containing blocks. This flag determines
// whether or not we want to wire the fixed-pos and abs-pos lists
// together.
PRPackedBool mFixedPosIsAbsPos;
// A boolean to indicate whether we have a "pending" popupgroup. That is, we
// have already created the FrameConstructionItem for the root popupgroup but
// we have not yet created the relevant frame.
PRPackedBool mHavePendingPopupgroup;
// Constructor
// Use the passed-in history state.
nsFrameConstructorState(nsIPresShell* aPresShell,
nsIFrame* aFixedContainingBlock,
nsIFrame* aAbsoluteContainingBlock,
nsIFrame* aFloatContainingBlock,
nsILayoutHistoryState* aHistoryState);
// Get the history state from the pres context's pres shell.
nsFrameConstructorState(nsIPresShell* aPresShell,
nsIFrame* aFixedContainingBlock,
nsIFrame* aAbsoluteContainingBlock,
nsIFrame* aFloatContainingBlock);
~nsFrameConstructorState();
// Function to push the existing absolute containing block state and
// create a new scope. Code that uses this function should get matching
// logic in GetAbsoluteContainingBlock.
void PushAbsoluteContainingBlock(nsIFrame* aNewAbsoluteContainingBlock,
nsFrameConstructorSaveState& aSaveState);
// Function to push the existing float containing block state and
// create a new scope. Code that uses this function should get matching
// logic in GetFloatContainingBlock.
// Pushing a null float containing block forbids any frames from being
// floated until a new float containing block is pushed.
// XXX we should get rid of null float containing blocks and teach the
// various frame classes to deal with floats instead.
void PushFloatContainingBlock(nsIFrame* aNewFloatContainingBlock,
nsFrameConstructorSaveState& aSaveState);
// Function to return the proper geometric parent for a frame with display
// struct given by aStyleDisplay and parent's frame given by
// aContentParentFrame.
nsIFrame* GetGeometricParent(const nsStyleDisplay* aStyleDisplay,
nsIFrame* aContentParentFrame);
/**
* Function to add a new frame to the right frame list. This MUST be called
* on frames before their children have been processed if the frames might
* conceivably be out-of-flow; otherwise cleanup in error cases won't work
* right. Also, this MUST be called on frames after they have been
* initialized.
* @param aNewFrame the frame to add
* @param aFrameItems the list to add in-flow frames to
* @param aContent the content pointer for aNewFrame
* @param aStyleContext the style context resolved for aContent
* @param aParentFrame the parent frame for the content if it were in-flow
* @param aCanBePositioned pass false if the frame isn't allowed to be
* positioned
* @param aCanBeFloated pass false if the frame isn't allowed to be
* floated
* @param aIsOutOfFlowPopup pass true if the frame is an out-of-flow popup
* (XUL-only)
* @throws NS_ERROR_OUT_OF_MEMORY if it happens.
* @note If this method throws, that means that aNewFrame was not inserted
* into any frame lists. Furthermore, this method will handle cleanup
* of aNewFrame (via calling CleanupFrameReferences() and Destroy() on
* it).
*/
nsresult AddChild(nsIFrame* aNewFrame,
nsFrameItems& aFrameItems,
nsIContent* aContent,
nsStyleContext* aStyleContext,
nsIFrame* aParentFrame,
PRBool aCanBePositioned = PR_TRUE,
PRBool aCanBeFloated = PR_TRUE,
PRBool aIsOutOfFlowPopup = PR_FALSE,
PRBool aInsertAfter = PR_FALSE,
nsIFrame* aInsertAfterFrame = nsnull);
/**
* Function to return the fixed-pos element list. Normally this will just hand back the
* fixed-pos element list, but in case we're dealing with a transformed element that's
* acting as an abs-pos and fixed-pos container, we'll hand back the abs-pos list. Callers should
* use this function if they want to get the list acting as the fixed-pos item parent.
*/
nsAbsoluteItems& GetFixedItems()
{
return mFixedPosIsAbsPos ? mAbsoluteItems : mFixedItems;
}
const nsAbsoluteItems& GetFixedItems() const
{
return mFixedPosIsAbsPos ? mAbsoluteItems : mFixedItems;
}
protected:
friend class nsFrameConstructorSaveState;
/**
* ProcessFrameInsertions takes the frames in aFrameItems and adds them as
* kids to the aChildListName child list of |aFrameItems.containingBlock|.
*/
void ProcessFrameInsertions(nsAbsoluteItems& aFrameItems,
nsIAtom* aChildListName);
};
nsFrameConstructorState::nsFrameConstructorState(nsIPresShell* aPresShell,
nsIFrame* aFixedContainingBlock,
nsIFrame* aAbsoluteContainingBlock,
nsIFrame* aFloatContainingBlock,
nsILayoutHistoryState* aHistoryState)
: mPresContext(aPresShell->GetPresContext()),
mPresShell(aPresShell),
mFrameManager(aPresShell->FrameManager()),
#ifdef MOZ_XUL
mPopupItems(nsnull),
#endif
mFixedItems(aFixedContainingBlock),
mAbsoluteItems(aAbsoluteContainingBlock),
mFloatedItems(aFloatContainingBlock),
// See PushAbsoluteContaningBlock below
mFrameState(aHistoryState),
mAdditionalStateBits(0),
mFixedPosIsAbsPos(aAbsoluteContainingBlock &&
aAbsoluteContainingBlock->GetStyleDisplay()->
HasTransform()),
mHavePendingPopupgroup(PR_FALSE)
{
#ifdef MOZ_XUL
nsIRootBox* rootBox = nsIRootBox::GetRootBox(aPresShell);
if (rootBox) {
mPopupItems.containingBlock = rootBox->GetPopupSetFrame();
}
#endif
MOZ_COUNT_CTOR(nsFrameConstructorState);
}
nsFrameConstructorState::nsFrameConstructorState(nsIPresShell* aPresShell,
nsIFrame* aFixedContainingBlock,
nsIFrame* aAbsoluteContainingBlock,
nsIFrame* aFloatContainingBlock)
: mPresContext(aPresShell->GetPresContext()),
mPresShell(aPresShell),