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gecko-dev/layout/base/nsFrameManager.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* This Original Code has been modified by IBM Corporation. Modifications made by IBM
* described herein are Copyright (c) International Business Machines Corporation, 2000.
* Modifications to Mozilla code or documentation identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 04/20/2000 IBM Corp. OS/2 VisualAge build.
*/
#include "nscore.h"
#include "nsIFrameManager.h"
#include "nsIFrame.h"
#include "nsIPresContext.h"
#include "nsIPresShell.h"
#include "nsIStyleSet.h"
#include "nsIStyleContext.h"
#include "nsStyleChangeList.h"
#include "nsIEventQueueService.h"
#include "nsIServiceManager.h"
#include "nsCOMPtr.h"
#include "prthread.h"
#include "plhash.h"
#include "nsDST.h"
#include "nsPlaceholderFrame.h"
#include "nsLayoutAtoms.h"
#include "nsHTMLAtoms.h"
#ifdef NS_DEBUG
#include "nsISupportsArray.h"
#include "nsIStyleRule.h"
#endif
#include "nsILayoutHistoryState.h"
#include "nsIStatefulFrame.h"
#include "nsIPresState.h"
#include "nsIContent.h"
#include "nsINameSpaceManager.h"
#include "nsIXMLContent.h"
#include "nsIDocument.h"
#include "nsIBindingManager.h"
#include "nsIScrollableFrame.h"
#include "nsIHTMLDocument.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMHTMLCollection.h"
#include "nsIFormControl.h"
#include "nsIDOMElement.h"
#include "nsIDOMHTMLFormElement.h"
#include "nsIForm.h"
#include "nsIContentList.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#define NEW_CONTEXT_PARENTAGE_INVARIANT
#ifdef NEW_CONTEXT_PARENTAGE_INVARIANT
#ifdef DEBUG
#undef NOISY_DEBUG
#else
#undef NOISY_DEBUG
#endif
#ifdef NOISY_DEBUG
#define NOISY_TRACE(_msg) \
printf("%s",_msg);
#define NOISY_TRACE_FRAME(_msg,_frame) \
printf("%s ",_msg); nsFrame::ListTag(stdout,_frame); printf("\n");
#else
#define NOISY_TRACE(_msg);
#define NOISY_TRACE_FRAME(_msg,_frame);
#endif
#endif // NEW_CONTEXT_PARENTAGE_INVARIANT
// Class IID's
static NS_DEFINE_CID(kEventQueueServiceCID, NS_EVENTQUEUESERVICE_CID);
// IID's
//----------------------------------------------------------------------
// Thin veneer around an NSPR hash table. Provides a map from a key that's
// a pointer to a value that's also a pointer.
class FrameHashTable {
public:
FrameHashTable(PRUint32 aNumBuckets = 16);
~FrameHashTable();
// Gets the value associated with the specified key
void* Get(void* aKey);
// Creates an association between the key and value. Returns the previous
// value associated with the key, or NULL if there was none
void* Put(void* aKey, void* aValue);
// Removes association for the key, and returns its associated value
void* Remove(void* aKey);
// Removes all entries from the hash table
void Clear();
#ifdef NS_DEBUG
void Dump(FILE* fp);
#endif
protected:
PLHashTable* mTable;
};
MOZ_DECL_CTOR_COUNTER(UndisplayedNode)
class UndisplayedNode {
public:
UndisplayedNode(nsIContent* aContent, nsIStyleContext* aStyle)
{
MOZ_COUNT_CTOR(UndisplayedNode);
mContent = aContent;
mStyle = aStyle;
NS_ADDREF(mStyle);
mNext = nsnull;
}
UndisplayedNode(nsIStyleContext* aPseudoStyle)
{
MOZ_COUNT_CTOR(UndisplayedNode);
mContent = nsnull;
mStyle = aPseudoStyle;
NS_ADDREF(mStyle);
mNext = nsnull;
}
~UndisplayedNode(void)
{
MOZ_COUNT_DTOR(UndisplayedNode);
NS_RELEASE(mStyle);
if (mNext) {
delete mNext;
}
}
nsIContent* mContent;
nsIStyleContext* mStyle;
UndisplayedNode* mNext;
};
class UndisplayedMap {
public:
UndisplayedMap(PRUint32 aNumBuckets = 16);
~UndisplayedMap(void);
UndisplayedNode* GetFirstNode(nsIContent* aParentContent);
nsresult AddNodeFor(nsIContent* aParentContent, nsIContent* aChild, nsIStyleContext* aStyle);
nsresult AddNodeFor(nsIContent* aParentContent, nsIStyleContext* aPseudoStyle);
nsresult RemoveNodeFor(nsIContent* aParentContent, UndisplayedNode* aNode);
nsresult RemoveNodesFor(nsIContent* aParentContent);
nsresult GetNodeFor(nsIContent* aContent, nsIStyleContext** aResult);
// Removes all entries from the hash table
void Clear(void);
protected:
PLHashEntry** GetEntryFor(nsIContent* aParentContent);
nsresult AppendNodeFor(UndisplayedNode* aNode, nsIContent* aParentContent);
PLHashTable* mTable;
PLHashEntry** mLastLookup;
};
//----------------------------------------------------------------------
class FrameManager;
// A CantRenderReplacedElementEvent has a weak pointer to the frame
// manager, and the frame manager has a weak pointer to the event.
// The event queue owns the event and the FrameManager will delete
// the event if it's going to go away.
struct CantRenderReplacedElementEvent : public PLEvent {
CantRenderReplacedElementEvent(FrameManager* aFrameManager, nsIFrame* aFrame);
nsIFrame* mFrame; // the frame that can't be rendered
CantRenderReplacedElementEvent* mNext; // next event in the list
};
class FrameManager : public nsIFrameManager
{
public:
FrameManager();
virtual ~FrameManager();
NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
// nsISupports
NS_DECL_ISUPPORTS
// nsIFrameManager
NS_IMETHOD Init(nsIPresShell* aPresShell, nsIStyleSet* aStyleSet);
NS_IMETHOD Destroy();
// Gets and sets the root frame
NS_IMETHOD GetRootFrame(nsIFrame** aRootFrame) const;
NS_IMETHOD SetRootFrame(nsIFrame* aRootFrame);
// Get the canvas frame: searches from the Root frame down, may be null
NS_IMETHOD GetCanvasFrame(nsIPresContext* aPresContext, nsIFrame** aCanvasFrame) const;
// Primary frame functions
NS_IMETHOD GetPrimaryFrameFor(nsIContent* aContent, nsIFrame** aPrimaryFrame);
NS_IMETHOD SetPrimaryFrameFor(nsIContent* aContent,
nsIFrame* aPrimaryFrame);
NS_IMETHOD ClearPrimaryFrameMap();
// Placeholder frame functions
NS_IMETHOD GetPlaceholderFrameFor(nsIFrame* aFrame,
nsIFrame** aPlaceholderFrame) const;
NS_IMETHOD SetPlaceholderFrameFor(nsIFrame* aFrame,
nsIFrame* aPlaceholderFrame);
NS_IMETHOD ClearPlaceholderFrameMap();
// Undisplayed content functions
NS_IMETHOD GetUndisplayedContent(nsIContent* aContent, nsIStyleContext** aStyleContext);
NS_IMETHOD SetUndisplayedContent(nsIContent* aContent, nsIStyleContext* aStyleContext);
NS_IMETHOD SetUndisplayedPseudoIn(nsIStyleContext* aPseudoContext,
nsIContent* aParentContent);
NS_IMETHOD ClearUndisplayedContentIn(nsIContent* aContent, nsIContent* aParentContent);
NS_IMETHOD ClearAllUndisplayedContentIn(nsIContent* aParentContent);
NS_IMETHOD ClearUndisplayedContentMap();
// Functions for manipulating the frame model
NS_IMETHOD AppendFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIFrame* aParentFrame,
nsIAtom* aListName,
nsIFrame* aFrameList);
NS_IMETHOD InsertFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIFrame* aParentFrame,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList);
NS_IMETHOD RemoveFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIFrame* aParentFrame,
nsIAtom* aListName,
nsIFrame* aOldFrame);
NS_IMETHOD ReplaceFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIFrame* aParentFrame,
nsIAtom* aListName,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame);
NS_IMETHOD CantRenderReplacedElement(nsIPresContext* aPresContext,
nsIFrame* aFrame);
NS_IMETHOD NotifyDestroyingFrame(nsIFrame* aFrame);
NS_IMETHOD ReParentStyleContext(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIStyleContext* aNewParentContext);
NS_IMETHOD ComputeStyleChangeFor(nsIPresContext* aPresContext,
nsIFrame* aFrame,
PRInt32 aAttrNameSpaceID,
nsIAtom* aAttribute,
nsStyleChangeList& aChangeList,
PRInt32 aMinChange,
PRInt32& aTopLevelChange);
NS_IMETHOD AttributeAffectsStyle(nsIAtom *aAttribute, nsIContent *aContent,
PRBool &aAffects);
// Capture state from the entire frame heirarchy and store in aState
NS_IMETHOD CaptureFrameState(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsILayoutHistoryState* aState);
NS_IMETHOD RestoreFrameState(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsILayoutHistoryState* aState);
// Add/restore state for one frame (special, global type, like scroll position)
NS_IMETHOD CaptureFrameStateFor(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsILayoutHistoryState* aState,
nsIStatefulFrame::SpecialStateID aID = nsIStatefulFrame::eNoID);
NS_IMETHOD RestoreFrameStateFor(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsILayoutHistoryState* aState,
nsIStatefulFrame::SpecialStateID aID = nsIStatefulFrame::eNoID);
NS_IMETHOD GenerateStateKey(nsIContent* aContent,
nsIStatefulFrame::SpecialStateID aID,
nsCString& aString);
// Gets and sets properties on a given frame
NS_IMETHOD GetFrameProperty(nsIFrame* aFrame,
nsIAtom* aPropertyName,
PRUint32 aOptions,
void** aPropertyValue);
NS_IMETHOD SetFrameProperty(nsIFrame* aFrame,
nsIAtom* aPropertyName,
void* aPropertyValue,
NSFMPropertyDtorFunc aPropDtorFunc);
NS_IMETHOD RemoveFrameProperty(nsIFrame* aFrame,
nsIAtom* aPropertyName);
#ifdef NS_DEBUG
NS_IMETHOD DebugVerifyStyleTree(nsIPresContext* aPresContext, nsIFrame* aFrame);
#endif
private:
struct PropertyList {
nsCOMPtr<nsIAtom> mName; // property name
nsDST* mFrameValueMap; // map of frame/value pairs
NSFMPropertyDtorFunc mDtorFunc; // property specific value dtor function
PropertyList* mNext;
PropertyList(nsIAtom* aName,
NSFMPropertyDtorFunc aDtorFunc,
nsDST::NodeArena* aDSTNodeArena);
~PropertyList();
// Removes the property associated with the given frame, and destroys
// the property value
PRBool RemovePropertyForFrame(nsIPresContext* aPresContext, nsIFrame* aFrame);
// Remove and destroy all remaining properties
void RemoveAllProperties(nsIPresContext* aPresContext);
};
nsIPresShell* mPresShell; // weak link, because the pres shell owns us
nsIStyleSet* mStyleSet; // weak link. pres shell holds a reference
nsIFrame* mRootFrame;
nsDST::NodeArena* mDSTNodeArena; // weak link. DST owns
nsDST* mPrimaryFrameMap;
FrameHashTable* mPlaceholderMap;
UndisplayedMap* mUndisplayedMap;
CantRenderReplacedElementEvent* mPostedEvents;
PropertyList* mPropertyList;
nsCOMPtr<nsIContentList> mHTMLForms;
nsCOMPtr<nsIContentList> mHTMLFormControls;
void ReResolveStyleContext(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIStyleContext* aParentContext,
nsIContent* aParentContent,
PRInt32 aAttrNameSpaceID,
nsIAtom* aAttribute,
nsStyleChangeList& aChangeList,
PRInt32 aMinChange,
PRInt32& aResultChange);
nsresult RevokePostedEvents();
CantRenderReplacedElementEvent** FindPostedEventFor(nsIFrame* aFrame);
void DequeuePostedEventFor(nsIFrame* aFrame);
void DestroyPropertyList(nsIPresContext* aPresContext);
PropertyList* GetPropertyListFor(nsIAtom* aPropertyName) const;
void RemoveAllPropertiesFor(nsIPresContext* aPresContext, nsIFrame* aFrame);
friend struct CantRenderReplacedElementEvent;
static void HandlePLEvent(CantRenderReplacedElementEvent* aEvent);
static void DestroyPLEvent(CantRenderReplacedElementEvent* aEvent);
};
//----------------------------------------------------------------------
NS_EXPORT nsresult
NS_NewFrameManager(nsIFrameManager** aInstancePtrResult)
{
NS_ENSURE_ARG_POINTER(aInstancePtrResult);
if (!aInstancePtrResult) {
return NS_ERROR_NULL_POINTER;
}
FrameManager* it = new FrameManager;
if (!it) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(NS_GET_IID(nsIFrameManager), (void **)aInstancePtrResult);
}
FrameManager::FrameManager()
{
NS_INIT_REFCNT();
}
FrameManager::~FrameManager()
{
NS_ASSERTION(!mPresShell, "FrameManager::Destroy never called");
}
NS_IMPL_ISUPPORTS1(FrameManager, nsIFrameManager)
NS_IMETHODIMP
FrameManager::Init(nsIPresShell* aPresShell,
nsIStyleSet* aStyleSet)
{
NS_ASSERTION(aPresShell, "null aPresShell");
NS_ASSERTION(aStyleSet, "null aStyleSet");
mPresShell = aPresShell;
mStyleSet = aStyleSet;
// Allocate the node arena that's shared by all the DST objects
mDSTNodeArena = nsDST::NewMemoryArena();
if (!mDSTNodeArena) {
return NS_ERROR_OUT_OF_MEMORY;
}
// Force the forms and form control content lists to be added as
// document observers *before* us (pres shell) so they will be
// up to date when we try to use them.
nsCOMPtr<nsIDocument> document;
mPresShell->GetDocument(getter_AddRefs(document));
nsCOMPtr<nsIHTMLDocument> htmlDocument(do_QueryInterface(document));
nsCOMPtr<nsIDOMHTMLDocument> domHtmlDocument(do_QueryInterface(htmlDocument));
if (domHtmlDocument) {
nsCOMPtr<nsIDOMHTMLCollection> forms;
domHtmlDocument->GetForms(getter_AddRefs(forms));
mHTMLForms = do_QueryInterface(forms);
nsCOMPtr<nsIDOMNodeList> formControls;
htmlDocument->GetFormControlElements(getter_AddRefs(formControls));
mHTMLFormControls = do_QueryInterface(formControls);
}
return NS_OK;
}
NS_IMETHODIMP
FrameManager::Destroy()
{
NS_ASSERTION(mPresShell, "Frame manager already shut down.");
nsCOMPtr<nsIPresContext> presContext;
mPresShell->GetPresContext(getter_AddRefs(presContext));
// Destroy the frame hierarchy. Don't destroy the property lists until after
// we've destroyed the frame hierarchy because some frames may expect to be
// able to retrieve their properties during destruction
if (mRootFrame) {
mRootFrame->Destroy(presContext);
mRootFrame = nsnull;
}
delete mPrimaryFrameMap;
delete mPlaceholderMap;
delete mUndisplayedMap;
DestroyPropertyList(presContext);
// If we're not going to be used anymore, we should revoke the
// pending |CantRenderReplacedElementEvent|s being sent to us.
nsresult rv = RevokePostedEvents();
NS_ASSERTION(NS_SUCCEEDED(rv), "RevokePostedEvents failed: might crash");
mPresShell = nsnull; // mPresShell isn't valid anymore. We
// won't use it, either, but we check it
// at the start of every function so that we'll
// be OK when nsIPresShell is converted to IDL.
return rv;
}
NS_IMETHODIMP
FrameManager::GetRootFrame(nsIFrame** aRootFrame) const
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_ENSURE_ARG_POINTER(aRootFrame);
*aRootFrame = mRootFrame;
return NS_OK;
}
NS_IMETHODIMP
FrameManager::SetRootFrame(nsIFrame* aRootFrame)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_PRECONDITION(!mRootFrame, "already have a root frame");
if (mRootFrame) {
return NS_ERROR_UNEXPECTED;
}
mRootFrame = aRootFrame;
return NS_OK;
}
NS_IMETHODIMP
FrameManager::GetCanvasFrame(nsIPresContext* aPresContext, nsIFrame** aCanvasFrame) const
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_PRECONDITION(aCanvasFrame, "aCanvasFrame argument cannot be null");
NS_PRECONDITION(aPresContext, "aPresContext argument cannot be null");
*aCanvasFrame = nsnull;
if (mRootFrame) {
// walk the children of the root frame looking for a frame with type==canvas
// start at the root
nsIFrame* childFrame = mRootFrame;
while (childFrame) {
// get each sibling of the child and check them, startig at the child
nsIFrame *siblingFrame = childFrame;
while (siblingFrame) {
nsCOMPtr<nsIAtom> frameType;
siblingFrame->GetFrameType(getter_AddRefs(frameType));
if (frameType.get() == nsLayoutAtoms::canvasFrame) {
// this is it: set the out-arg and stop looking
*aCanvasFrame = siblingFrame;
break;
} else {
siblingFrame->GetNextSibling(&siblingFrame);
}
}
// move on to the child's child
childFrame->FirstChild(aPresContext, nsnull, &childFrame);
}
}
return NS_OK;
}
//----------------------------------------------------------------------
// Primary frame functions
NS_IMETHODIMP
FrameManager::GetPrimaryFrameFor(nsIContent* aContent, nsIFrame** aResult)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_ENSURE_ARG_POINTER(aResult);
NS_ENSURE_ARG_POINTER(aContent);
*aResult = nsnull; // initialize out param
nsresult rv;
if (mPrimaryFrameMap) {
mPrimaryFrameMap->Search(aContent, 0, (void**)aResult);
if (!*aResult) {
// XXX: todo: Add a lookup into the undisplay map to skip searches
// if we already know the content has no frame.
// nsCSSFrameConstructor calls SetUndisplayedContent() for every
// content node that has display: none.
// Today, the undisplay map doesn't quite support what we need.
// We need to see if we can add a method to make a search for aContent
// very fast in the embedded hash table.
// This would almost completely remove the lookup penalty for things
// like <SCRIPT> and comments in very large documents.
nsCOMPtr<nsIStyleSet> styleSet;
nsCOMPtr<nsIPresContext> presContext;
// Give the frame construction code the opportunity to return the
// frame that maps the content object
mPresShell->GetStyleSet(getter_AddRefs(styleSet));
NS_ASSERTION(styleSet, "bad style set");
mPresShell->GetPresContext(getter_AddRefs(presContext));
NS_ASSERTION(presContext, "bad presContext");
if (!styleSet || !presContext) {
return NS_ERROR_NULL_POINTER;
}
// if the prev sibling of aContent has a cached primary frame,
// pass that data in to the style set to speed things up
// if any methods in here fail, don't report that failure
// we're just trying to enhance performance here, not test for correctness
nsFindFrameHint hint;
nsCOMPtr<nsIContent> prevSibling, parent;
rv = aContent->GetParent(*getter_AddRefs(parent));
if (NS_SUCCEEDED(rv) && parent)
{
PRInt32 index;
rv = parent->IndexOf(aContent, index);
if (NS_SUCCEEDED(rv) && index>0) // no use looking if it's the first child
{
rv = parent->ChildAt(index-1, *getter_AddRefs(prevSibling));
if (NS_SUCCEEDED(rv) && prevSibling)
{
mPrimaryFrameMap->Search(prevSibling.get(), 0, (void**)&hint.mPrimaryFrameForPrevSibling);
}
}
}
// walk the frame tree to find the frame that maps aContent.
// Use the hint if we have it.
styleSet->FindPrimaryFrameFor(presContext, this, aContent, aResult,
hint.mPrimaryFrameForPrevSibling ? &hint : nsnull);
}
}
return NS_OK;
}
NS_IMETHODIMP
FrameManager::SetPrimaryFrameFor(nsIContent* aContent,
nsIFrame* aPrimaryFrame)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_ENSURE_ARG_POINTER(aContent);
// it's ok if aPrimaryFrame is null
// If aPrimaryFrame is NULL, then remove the mapping
if (!aPrimaryFrame) {
if (mPrimaryFrameMap) {
mPrimaryFrameMap->Remove(aContent);
}
} else {
// Create a new DST if necessary
if (!mPrimaryFrameMap) {
mPrimaryFrameMap = new nsDST(mDSTNodeArena);
if (!mPrimaryFrameMap) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
// Add a mapping to the hash table
mPrimaryFrameMap->Insert(aContent, (void*)aPrimaryFrame, nsnull);
}
return NS_OK;
}
NS_IMETHODIMP
FrameManager::ClearPrimaryFrameMap()
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
if (mPrimaryFrameMap) {
mPrimaryFrameMap->Clear();
}
return NS_OK;
}
// Placeholder frame functions
NS_IMETHODIMP
FrameManager::GetPlaceholderFrameFor(nsIFrame* aFrame,
nsIFrame** aResult) const
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_ENSURE_ARG_POINTER(aResult);
NS_ENSURE_ARG_POINTER(aFrame);
if (!aResult || !aFrame) {
return NS_ERROR_NULL_POINTER;
}
if (mPlaceholderMap) {
*aResult = (nsIFrame*)mPlaceholderMap->Get(aFrame);
} else {
*aResult = nsnull;
}
return NS_OK;
}
NS_IMETHODIMP
FrameManager::SetPlaceholderFrameFor(nsIFrame* aFrame,
nsIFrame* aPlaceholderFrame)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_ENSURE_ARG_POINTER(aFrame);
#ifdef NS_DEBUG
// Verify that the placeholder frame is of the correct type
if (aPlaceholderFrame) {
nsIAtom* frameType;
aPlaceholderFrame->GetFrameType(&frameType);
NS_PRECONDITION(nsLayoutAtoms::placeholderFrame == frameType, "unexpected frame type");
NS_IF_RELEASE(frameType);
}
#endif
// If aPlaceholderFrame is NULL, then remove the mapping
if (!aPlaceholderFrame) {
if (mPlaceholderMap) {
mPlaceholderMap->Remove(aFrame);
}
} else {
// Create a new hash table if necessary
if (!mPlaceholderMap) {
mPlaceholderMap = new FrameHashTable;
if (!mPlaceholderMap) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
// Add a mapping to the hash table
mPlaceholderMap->Put(aFrame, (void*)aPlaceholderFrame);
}
return NS_OK;
}
NS_IMETHODIMP
FrameManager::ClearPlaceholderFrameMap()
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
if (mPlaceholderMap) {
mPlaceholderMap->Clear();
}
return NS_OK;
}
//----------------------------------------------------------------------
NS_IMETHODIMP
FrameManager::GetUndisplayedContent(nsIContent* aContent, nsIStyleContext** aResult)
{
if (!aContent || !aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = nsnull; // initialize out param
if (mUndisplayedMap)
mUndisplayedMap->GetNodeFor(aContent, aResult);
return NS_OK;
}
NS_IMETHODIMP
FrameManager::SetUndisplayedContent(nsIContent* aContent,
nsIStyleContext* aStyleContext)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
if (! mUndisplayedMap) {
mUndisplayedMap = new UndisplayedMap;
}
if (mUndisplayedMap) {
nsresult result = NS_OK;
nsIContent* parent = nsnull;
aContent->GetParent(parent);
if (parent) {
result = mUndisplayedMap->AddNodeFor(parent, aContent, aStyleContext);
NS_RELEASE(parent);
}
return result;
}
return NS_ERROR_OUT_OF_MEMORY;
}
NS_IMETHODIMP
FrameManager::SetUndisplayedPseudoIn(nsIStyleContext* aPseudoContext,
nsIContent* aParentContent)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
if (! mUndisplayedMap) {
mUndisplayedMap = new UndisplayedMap;
}
if (mUndisplayedMap) {
return mUndisplayedMap->AddNodeFor(aParentContent, aPseudoContext);
}
return NS_ERROR_OUT_OF_MEMORY;
}
NS_IMETHODIMP
FrameManager::ClearUndisplayedContentIn(nsIContent* aContent, nsIContent* aParentContent)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
if (mUndisplayedMap) {
UndisplayedNode* node = mUndisplayedMap->GetFirstNode(aParentContent);
while (node) {
if (node->mContent == aContent) {
return mUndisplayedMap->RemoveNodeFor(aParentContent, node);
}
node = node->mNext;
}
}
return NS_OK;
}
NS_IMETHODIMP
FrameManager::ClearAllUndisplayedContentIn(nsIContent* aParentContent)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
if (mUndisplayedMap) {
return mUndisplayedMap->RemoveNodesFor(aParentContent);
}
return NS_OK;
}
NS_IMETHODIMP
FrameManager::ClearUndisplayedContentMap()
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
if (mUndisplayedMap) {
mUndisplayedMap->Clear();
}
return NS_OK;
}
//----------------------------------------------------------------------
NS_IMETHODIMP
FrameManager::AppendFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIFrame* aParentFrame,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
return aParentFrame->AppendFrames(aPresContext, aPresShell, aListName,
aFrameList);
}
NS_IMETHODIMP
FrameManager::InsertFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIFrame* aParentFrame,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
#ifdef IBMBIDI
if (aPrevFrame) {
// Insert aFrameList after the last bidi continuation of aPrevFrame.
nsIFrame* nextBidi;
for (; ;) {
GetFrameProperty(aPrevFrame, nsLayoutAtoms::nextBidi, 0, (void**) &nextBidi);
if (!nextBidi) {
break;
}
aPrevFrame = nextBidi;
}
}
#endif // IBMBIDI
return aParentFrame->InsertFrames(aPresContext, aPresShell, aListName,
aPrevFrame, aFrameList);
}
NS_IMETHODIMP
FrameManager::RemoveFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIFrame* aParentFrame,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
#ifdef IBMBIDI
// Don't let the parent remove next bidi. In the other cases the it should NOT be removed.
nsIFrame* nextBidi;
GetFrameProperty(aOldFrame, nsLayoutAtoms::nextBidi, 0, (void**) &nextBidi);
if (nextBidi) {
RemoveFrame(aPresContext, aPresShell, aParentFrame, aListName, nextBidi);
}
#endif // IBMBIDI
return aParentFrame->RemoveFrame(aPresContext, aPresShell, aListName,
aOldFrame);
}
NS_IMETHODIMP
FrameManager::ReplaceFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIFrame* aParentFrame,
nsIAtom* aListName,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
return aParentFrame->ReplaceFrame(aPresContext, aPresShell, aListName,
aOldFrame, aNewFrame);
}
//----------------------------------------------------------------------
NS_IMETHODIMP
FrameManager::NotifyDestroyingFrame(nsIFrame* aFrame)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
// Dequeue and destroy and posted events for this frame
DequeuePostedEventFor(aFrame);
// Remove all properties associated with the frame
nsCOMPtr<nsIPresContext> presContext;
mPresShell->GetPresContext(getter_AddRefs(presContext));
RemoveAllPropertiesFor(presContext, aFrame);
return NS_OK;
}
nsresult
FrameManager::RevokePostedEvents()
{
nsresult rv = NS_OK;
#ifdef NOISY_EVENTS
printf("%p ~RevokePostedEvents() start\n", this);
#endif
if (mPostedEvents) {
mPostedEvents = nsnull;
// Revoke any events in the event queue that are owned by us
nsIEventQueueService* eventService;
rv = nsServiceManager::GetService(kEventQueueServiceCID,
NS_GET_IID(nsIEventQueueService),
(nsISupports **)&eventService);
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsIEventQueue> eventQueue;
rv = eventService->GetThreadEventQueue(NS_CURRENT_THREAD,
getter_AddRefs(eventQueue));
nsServiceManager::ReleaseService(kEventQueueServiceCID, eventService);
if (NS_SUCCEEDED(rv) && eventQueue) {
rv = eventQueue->RevokeEvents(this);
}
}
}
#ifdef NOISY_EVENTS
printf("%p ~RevokePostedEvents() end\n", this);
#endif
return rv;
}
CantRenderReplacedElementEvent**
FrameManager::FindPostedEventFor(nsIFrame* aFrame)
{
CantRenderReplacedElementEvent** event = &mPostedEvents;
while (*event) {
if ((*event)->mFrame == aFrame) {
return event;
}
event = &(*event)->mNext;
}
return event;
}
void
FrameManager::DequeuePostedEventFor(nsIFrame* aFrame)
{
// If there's a posted event for this frame, then remove it
CantRenderReplacedElementEvent** event = FindPostedEventFor(aFrame);
if (*event) {
CantRenderReplacedElementEvent* tmp = *event;
// Remove it from our linked list of posted events
*event = (*event)->mNext;
// Dequeue it from the event queue
nsIEventQueueService* eventService;
nsresult rv;
rv = nsServiceManager::GetService(kEventQueueServiceCID,
NS_GET_IID(nsIEventQueueService),
(nsISupports **)&eventService);
NS_ASSERTION(NS_SUCCEEDED(rv),
"will crash soon due to event holding dangling pointer to frame");
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsIEventQueue> eventQueue;
rv = eventService->GetThreadEventQueue(NS_CURRENT_THREAD,
getter_AddRefs(eventQueue));
nsServiceManager::ReleaseService(kEventQueueServiceCID, eventService);
NS_ASSERTION(NS_SUCCEEDED(rv) && eventQueue,
"will crash soon due to event holding dangling pointer to frame");
if (NS_SUCCEEDED(rv) && eventQueue) {
PLEventQueue* plqueue;
eventQueue->GetPLEventQueue(&plqueue);
NS_ASSERTION(plqueue,
"will crash soon due to event holding dangling pointer to frame");
if (plqueue) {
// Removes the event and destroys it
PL_DequeueEvent(tmp, plqueue);
}
}
}
}
}
void
FrameManager::HandlePLEvent(CantRenderReplacedElementEvent* aEvent)
{
#ifdef NOISY_EVENTS
printf("FrameManager::HandlePLEvent() start for FM %p\n", aEvent->owner);
#endif
FrameManager* frameManager = (FrameManager*)aEvent->owner;
NS_ASSERTION(frameManager, "null frame manager");
if (!frameManager->mPresShell) {
NS_ASSERTION(frameManager->mPresShell,
"event not removed from queue on shutdown");
return;
}
// Remove the posted event from the linked list
CantRenderReplacedElementEvent** events = &frameManager->mPostedEvents;
while (*events) {
if (*events == aEvent) {
*events = (*events)->mNext;
break;
}
events = &(*events)->mNext;
NS_ASSERTION(*events, "event not in queue");
}
// Notify the style system and then process any reflow commands that
// are generated
nsCOMPtr<nsIPresContext> presContext;
frameManager->mPresShell->GetPresContext(getter_AddRefs(presContext));
frameManager->mStyleSet->CantRenderReplacedElement(presContext,
aEvent->mFrame);
#ifdef NOISY_EVENTS
printf("FrameManager::HandlePLEvent() end for FM %p\n", aEvent->owner);
#endif
}
void
FrameManager::DestroyPLEvent(CantRenderReplacedElementEvent* aEvent)
{
delete aEvent;
}
CantRenderReplacedElementEvent::CantRenderReplacedElementEvent(FrameManager* aFrameManager,
nsIFrame* aFrame)
{
PL_InitEvent(this, aFrameManager,
(PLHandleEventProc)&FrameManager::HandlePLEvent,
(PLDestroyEventProc)&FrameManager::DestroyPLEvent);
mFrame = aFrame;
}
NS_IMETHODIMP
FrameManager::CantRenderReplacedElement(nsIPresContext* aPresContext,
nsIFrame* aFrame)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
#ifdef NOISY_EVENTS
printf("%p FrameManager::CantRenderReplacedElement called\n", this);
#endif
// We need to notify the style stystem, but post the notification so it
// doesn't happen now
nsresult rv;
nsCOMPtr<nsIEventQueueService> eventService = do_GetService(kEventQueueServiceCID, &rv);
if (eventService) {
nsCOMPtr<nsIEventQueue> eventQueue;
rv = eventService->GetThreadEventQueue(NS_CURRENT_THREAD,
getter_AddRefs(eventQueue));
if (NS_SUCCEEDED(rv) && eventQueue) {
// Verify that there isn't already a posted event associated with
// this frame.
if (*FindPostedEventFor(aFrame))
return NS_OK;
CantRenderReplacedElementEvent* ev;
// Create a new event
ev = new CantRenderReplacedElementEvent(this, aFrame);
// Add the event to our linked list of posted events
ev->mNext = mPostedEvents;
mPostedEvents = ev;
// Post the event
eventQueue->PostEvent(ev);
}
}
return rv;
}
#ifdef NS_DEBUG
static void
DumpContext(nsIFrame* aFrame, nsIStyleContext* aContext)
{
if (aFrame) {
fputs("frame: ", stdout);
nsAutoString name;
nsIFrameDebug* frameDebug;
if (NS_SUCCEEDED(aFrame->QueryInterface(NS_GET_IID(nsIFrameDebug), (void**)&frameDebug))) {
frameDebug->GetFrameName(name);
fputs(NS_LossyConvertUCS2toASCII(name).get(), stdout);
}
fprintf(stdout, " (%p)", NS_STATIC_CAST(void*, aFrame));
}
if (aContext) {
fprintf(stdout, " style: %p ", NS_STATIC_CAST(void*, aContext));
nsIAtom* pseudoTag;
aContext->GetPseudoType(pseudoTag);
if (pseudoTag) {
nsAutoString buffer;
pseudoTag->ToString(buffer);
fputs(NS_LossyConvertUCS2toASCII(buffer).get(), stdout);
fputs(" ", stdout);
NS_RELEASE(pseudoTag);
}
/* XXXdwh fix debugging here. Need to add a List method to nsRuleNode
and have the context call list on its rule node.
PRInt32 count = aContext->GetStyleRuleCount();
if (0 < count) {
fputs("{\n", stdout);
nsISupportsArray* rules = aContext->GetStyleRules();
PRInt32 ix;
for (ix = 0; ix < count; ix++) {
nsIStyleRule* rule = (nsIStyleRule*)rules->ElementAt(ix);
rule->List(stdout, 1);
NS_RELEASE(rule);
}
NS_RELEASE(rules);
fputs("}\n", stdout);
}
else
*/
{
fputs("{}\n", stdout);
}
}
}
#ifdef NEW_CONTEXT_PARENTAGE_INVARIANT
static void
VerifyContextParent(nsIPresContext* aPresContext, nsIFrame* aFrame,
nsIStyleContext* aContext, nsIStyleContext* aParentContext)
{
nsIAtom* frameType;
// get the contexts not provided
if (!aContext) {
aFrame->GetStyleContext(&aContext);
} else {
// addref here so we can release at end
NS_ADDREF(aContext);
}
if (!aParentContext) {
// Get the correct parent context from the frame
// - if the frame is a placeholder, we get the out of flow frame's context
// as the parent context instead of asking the frame
aFrame->GetFrameType(&frameType);
if (nsLayoutAtoms::placeholderFrame == frameType) { // placeholder
// get out of flow frame's context as the parent context
nsIFrame* outOfFlowFrame = ((nsPlaceholderFrame*)aFrame)->GetOutOfFlowFrame();
NS_ASSERTION(outOfFlowFrame, "no out-of-flow frame");
outOfFlowFrame->GetStyleContext(&aParentContext);
} else {
// get the parent context from the frame (indirectly)
nsIFrame* providerFrame = nsnull;
nsContextProviderRelationship relationship;
aFrame->GetParentStyleContextProvider(aPresContext,&providerFrame,relationship);
if (providerFrame) {
providerFrame->GetStyleContext(&aParentContext);
} else {
// no parent context provider: it is OK, some frames' contexts do not have parents
}
}
NS_IF_RELEASE(frameType);
} else {
// addref the parent context so we can release it at end
NS_ADDREF(aParentContext);
}
NS_ASSERTION(aContext, "Failure to get required contexts");
nsIStyleContext* actualParentContext = aContext->GetParent();
if (aParentContext) {
if (aParentContext != actualParentContext) {
DumpContext(aFrame, aContext);
if (aContext == aParentContext) {
fputs("Using parent's style context\n\n", stdout);
}
else {
fputs("Wrong parent style context: ", stdout);
DumpContext(nsnull, actualParentContext);
fputs("should be using: ", stdout);
DumpContext(nsnull, aParentContext);
fputs("\n", stdout);
}
}
}
else {
if (actualParentContext) {
DumpContext(aFrame, aContext);
fputs("Has parent context: ", stdout);
DumpContext(nsnull, actualParentContext);
fputs("Should be null\n\n", stdout);
}
}
NS_IF_RELEASE(actualParentContext);
NS_IF_RELEASE(aParentContext);
NS_IF_RELEASE(aContext);
}
static void
VerifyStyleTree(nsIPresContext* aPresContext, nsIFrame* aFrame, nsIStyleContext* aParentContext)
{
nsIStyleContext* context;
aFrame->GetStyleContext(&context);
VerifyContextParent(aPresContext, aFrame, context, aParentContext);
PRInt32 listIndex = 0;
nsIAtom* childList = nsnull;
nsIFrame* child;
nsIAtom* frameType;
do {
child = nsnull;
nsresult result = aFrame->FirstChild(aPresContext, childList, &child);
while ((NS_SUCCEEDED(result)) && child) {
nsFrameState state;
child->GetFrameState(&state);
if (NS_FRAME_OUT_OF_FLOW != (state & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that are in flow
child->GetFrameType(&frameType);
if (nsLayoutAtoms::placeholderFrame == frameType) {
// placeholder: first recirse and verify the out of flow frame,
// then verify the placeholder's context
nsIFrame* outOfFlowFrame = ((nsPlaceholderFrame*)child)->GetOutOfFlowFrame();
NS_ASSERTION(outOfFlowFrame, "no out-of-flow frame");
nsIStyleContext* outOfFlowContext;
// recurse to out of flow frame, letting the parent context get resolved
VerifyStyleTree(aPresContext, outOfFlowFrame, nsnull);
// verify placeholder using the out of flow's context as parent context
outOfFlowFrame->GetStyleContext(&outOfFlowContext);
VerifyContextParent(aPresContext,child, nsnull, outOfFlowContext);
NS_IF_RELEASE(outOfFlowContext);
}
else { // regular frame
VerifyStyleTree(aPresContext, child, nsnull);
}
NS_IF_RELEASE(frameType);
}
child->GetNextSibling(&child);
}
NS_IF_RELEASE(childList);
aFrame->GetAdditionalChildListName(listIndex++, &childList);
} while (childList);
// do additional contexts
PRInt32 contextIndex = -1;
while (1 == 1) {
nsIStyleContext* extraContext = nsnull;
aFrame->GetAdditionalStyleContext(++contextIndex, &extraContext);
if (extraContext) {
VerifyContextParent(aPresContext, aFrame, extraContext, context);
NS_RELEASE(extraContext);
}
else {
break;
}
}
NS_RELEASE(context);
}
NS_IMETHODIMP
FrameManager::DebugVerifyStyleTree(nsIPresContext* aPresContext, nsIFrame* aFrame)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
if (aFrame) {
nsIStyleContext* context;
aFrame->GetStyleContext(&context);
nsIStyleContext* parentContext = context->GetParent();
VerifyStyleTree(aPresContext, aFrame, parentContext);
NS_IF_RELEASE(parentContext);
NS_RELEASE(context);
}
return NS_OK;
}
#else // NEW_CONTEXT_PARENTAGE_INVARIANT
static void
VerifyContextParent(nsIFrame* aFrame, nsIStyleContext* aContext, nsIStyleContext* aParentContext)
{
nsIStyleContext* actualParentContext = aContext->GetParent();
if (aParentContext) {
if (aParentContext != actualParentContext) {
DumpContext(aFrame, aContext);
if (aContext == aParentContext) {
fputs("Using parent's style context\n\n", stdout);
}
else {
fputs("Wrong parent style context: ", stdout);
DumpContext(nsnull, actualParentContext);
fputs("should be using: ", stdout);
DumpContext(nsnull, aParentContext);
fputs("\n", stdout);
}
}
}
else {
if (actualParentContext) {
DumpContext(aFrame, aContext);
fputs("Has parent context: ", stdout);
DumpContext(nsnull, actualParentContext);
fputs("Should be null\n\n", stdout);
}
}
NS_IF_RELEASE(actualParentContext);
}
static void
VerifyContextParent(nsIFrame* aFrame, nsIStyleContext* aParentContext)
{
nsIStyleContext* context;
aFrame->GetStyleContext(&context);
VerifyContextParent(aFrame, context, aParentContext);
NS_RELEASE(context);
}
static void
VerifyStyleTree(nsIPresContext* aPresContext, nsIFrame* aFrame, nsIStyleContext* aParentContext)
{
nsIStyleContext* context;
aFrame->GetStyleContext(&context);
VerifyContextParent(aFrame, aParentContext);
PRInt32 listIndex = 0;
nsIAtom* childList = nsnull;
nsIFrame* child;
nsIAtom* frameType;
do {
child = nsnull;
nsresult result = aFrame->FirstChild(aPresContext, childList, &child);
while ((NS_SUCCEEDED(result)) && child) {
nsFrameState state;
child->GetFrameState(&state);
if (NS_FRAME_OUT_OF_FLOW != (state & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that are in flow
child->GetFrameType(&frameType);
if (nsLayoutAtoms::placeholderFrame == frameType) { // placeholder
// get out of flow frame and recurse there
nsIFrame* outOfFlowFrame = ((nsPlaceholderFrame*)child)->GetOutOfFlowFrame();
NS_ASSERTION(outOfFlowFrame, "no out-of-flow frame");
nsIStyleContext* outOfFlowContext;
outOfFlowFrame->GetStyleContext(&outOfFlowContext);
VerifyContextParent(child, outOfFlowContext);
NS_RELEASE(outOfFlowContext);
VerifyStyleTree(aPresContext, outOfFlowFrame, context);
}
else { // regular frame
VerifyStyleTree(aPresContext, child, context);
}
NS_IF_RELEASE(frameType);
}
child->GetNextSibling(&child);
}
NS_IF_RELEASE(childList);
aFrame->GetAdditionalChildListName(listIndex++, &childList);
} while (childList);
// do additional contexts
PRInt32 contextIndex = -1;
while (1 == 1) {
nsIStyleContext* extraContext = nsnull;
aFrame->GetAdditionalStyleContext(++contextIndex, &extraContext);
if (extraContext) {
VerifyContextParent(aFrame, extraContext, context);
NS_RELEASE(extraContext);
}
else {
break;
}
}
NS_RELEASE(context);
}
NS_IMETHODIMP
FrameManager::DebugVerifyStyleTree(nsIPresContext* aPresContext, nsIFrame* aFrame)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
if (aFrame) {
nsIStyleContext* context;
aFrame->GetStyleContext(&context);
nsIStyleContext* parentContext = context->GetParent();
VerifyStyleTree(aPresContext, aFrame, parentContext);
NS_IF_RELEASE(parentContext);
NS_RELEASE(context);
}
return NS_OK;
}
#endif //NEW_CONTEXT_PARENTAGE_INVARIANT
#endif // DEBUG
NS_IMETHODIMP
FrameManager::ReParentStyleContext(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIStyleContext* aNewParentContext)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
nsresult result = NS_ERROR_NULL_POINTER;
if (aFrame) {
#ifdef NS_DEBUG
DebugVerifyStyleTree(aPresContext, aFrame);
#endif
nsIStyleContext* oldContext = nsnull;
aFrame->GetStyleContext(&oldContext);
if (oldContext) {
nsIStyleContext* newContext = nsnull;
result = mStyleSet->ReParentStyleContext(aPresContext,
oldContext, aNewParentContext,
&newContext);
if (NS_SUCCEEDED(result) && newContext) {
if (newContext != oldContext) {
PRInt32 listIndex = 0;
nsIAtom* childList = nsnull;
nsIFrame* child;
nsIAtom* frameType;
do {
child = nsnull;
result = aFrame->FirstChild(aPresContext, childList, &child);
while ((NS_SUCCEEDED(result)) && child) {
nsFrameState state;
child->GetFrameState(&state);
if (NS_FRAME_OUT_OF_FLOW != (state & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that are in flow
child->GetFrameType(&frameType);
if (nsLayoutAtoms::placeholderFrame == frameType) { // placeholder
// get out of flow frame and recurse there
nsIFrame* outOfFlowFrame = ((nsPlaceholderFrame*)child)->GetOutOfFlowFrame();
NS_ASSERTION(outOfFlowFrame, "no out-of-flow frame");
result = ReParentStyleContext(aPresContext, outOfFlowFrame, newContext);
// reparent placeholder's context under out of flow frame
nsIStyleContext* outOfFlowContext;
outOfFlowFrame->GetStyleContext(&outOfFlowContext);
ReParentStyleContext(aPresContext, child, outOfFlowContext);
NS_RELEASE(outOfFlowContext);
}
else { // regular frame
result = ReParentStyleContext(aPresContext, child, newContext);
}
NS_IF_RELEASE(frameType);
}
child->GetNextSibling(&child);
}
NS_IF_RELEASE(childList);
aFrame->GetAdditionalChildListName(listIndex++, &childList);
} while (childList);
aFrame->SetStyleContext(aPresContext, newContext);
// do additional contexts
PRInt32 contextIndex = -1;
while (1 == 1) {
nsIStyleContext* oldExtraContext = nsnull;
result = aFrame->GetAdditionalStyleContext(++contextIndex, &oldExtraContext);
if (NS_SUCCEEDED(result)) {
if (oldExtraContext) {
nsIStyleContext* newExtraContext = nsnull;
result = mStyleSet->ReParentStyleContext(aPresContext,
oldExtraContext, newContext,
&newExtraContext);
if (NS_SUCCEEDED(result) && newExtraContext) {
aFrame->SetAdditionalStyleContext(contextIndex, newExtraContext);
NS_RELEASE(newExtraContext);
}
NS_RELEASE(oldExtraContext);
}
}
else {
result = NS_OK; // ok not to have extras (or run out)
break;
}
}
#ifdef NS_DEBUG
VerifyStyleTree(aPresContext, aFrame, aNewParentContext);
#endif
}
NS_RELEASE(newContext);
}
NS_RELEASE(oldContext);
}
}
return result;
}
static PRBool
HasAttributeContent(nsIStyleContext* aStyleContext,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute)
{
PRBool result = PR_FALSE;
if (aStyleContext) {
const nsStyleContent* content = (const nsStyleContent*)aStyleContext->GetStyleData(eStyleStruct_Content);
PRUint32 count = content->ContentCount();
while ((0 < count) && (! result)) {
nsStyleContentType contentType;
nsAutoString contentString;
content->GetContentAt(--count, contentType, contentString);
if (eStyleContentType_Attr == contentType) {
nsIAtom* attrName = nsnull;
PRInt32 attrNameSpace = kNameSpaceID_None;
PRInt32 barIndex = contentString.FindChar('|'); // CSS namespace delimiter
if (-1 != barIndex) {
nsAutoString nameSpaceVal;
contentString.Left(nameSpaceVal, barIndex);
PRInt32 error;
attrNameSpace = nameSpaceVal.ToInteger(&error, 10);
contentString.Cut(0, barIndex + 1);
if (contentString.Length()) {
attrName = NS_NewAtom(contentString);
}
}
else {
attrName = NS_NewAtom(contentString);
}
if ((attrName == aAttribute) &&
((attrNameSpace == aNameSpaceID) ||
(attrNameSpace == kNameSpaceID_Unknown))) {
result = PR_TRUE;
}
NS_IF_RELEASE(attrName);
}
}
}
return result;
}
static PRInt32
CaptureChange(nsIStyleContext* aOldContext, nsIStyleContext* aNewContext,
nsIFrame* aFrame, nsIContent* aContent,
nsStyleChangeList& aChangeList, PRInt32 aMinChange)
{
PRInt32 ourChange = NS_STYLE_HINT_NONE;
aNewContext->CalcStyleDifference(aOldContext, ourChange);
if (aMinChange < ourChange) {
aChangeList.AppendChange(aFrame, aContent, ourChange);
aMinChange = ourChange;
}
return aMinChange;
}
#ifdef NEW_CONTEXT_PARENTAGE_INVARIANT
void
FrameManager::ReResolveStyleContext(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIStyleContext* aParentContext,
nsIContent* aParentContent,
PRInt32 aAttrNameSpaceID,
nsIAtom* aAttribute,
nsStyleChangeList& aChangeList,
PRInt32 aMinChange,
PRInt32& aResultChange)
{
nsIFrame *resolvedDescendant = nsnull;
nsIStyleContext* oldContext = nsnull;
nsresult result = aFrame->GetStyleContext(&oldContext);
if (NS_SUCCEEDED(result) && oldContext) {
nsIAtom* pseudoTag = nsnull;
oldContext->GetPseudoType(pseudoTag);
nsIContent* localContent = nsnull;
nsIContent* content = nsnull;
result = aFrame->GetContent(&localContent);
if (NS_SUCCEEDED(result) && localContent) {
content = localContent;
}
else {
content = aParentContent;
}
if (aParentContent && aAttribute) { // attribute came from parent, we don't care about it here when recursing
nsFrameState frameState;
aFrame->GetFrameState(&frameState);
if (0 == (frameState & NS_FRAME_GENERATED_CONTENT)) { // keep it for generated content
aAttribute = nsnull;
}
}
if (aParentContext == nsnull) {
NOISY_TRACE_FRAME("null parent context in ReResolveStyle: getting provider frame for",aFrame);
// get the parent context from the frame (indirectly)
nsIFrame* providerFrame = nsnull;
nsContextProviderRelationship relationship;
aFrame->GetParentStyleContextProvider(aPresContext,&providerFrame,relationship);
if (providerFrame) {
NOISY_TRACE("provider frame retrieved in ReResolveStyle: ");
// see if we need to recurse and resolve the provider frame first
if (relationship != eContextProvider_Ancestor) {
NOISY_TRACE("non-ancestor provider, recursing.\n");
// provider is not an ancestor, so assume we have to reresolve it first
ReResolveStyleContext(aPresContext, providerFrame, nsnull, content,
aAttrNameSpaceID, aAttribute,
aChangeList, aMinChange, aResultChange);
resolvedDescendant = providerFrame;
NOISY_TRACE("returned from recursion, descendant parent context provider resolved.\n");
} else {
NOISY_TRACE("ancestor provider, assuming already resolved.\n");
}
providerFrame->GetStyleContext(&aParentContext);
}
} else {
// addref the parent passed in so we can release it at the end
NS_ADDREF(aParentContext);
NOISY_TRACE_FRAME("non-null parent context provided: using it and assuming already resolved",aFrame);
}
NS_ASSERTION(aParentContext, "Failed to resolve parent context");
// do primary context
nsIStyleContext* newContext = nsnull;
if (pseudoTag) {
nsIContent* pseudoContent = (aParentContent ? aParentContent : localContent);
aPresContext->ResolvePseudoStyleContextFor(pseudoContent, pseudoTag, aParentContext, PR_FALSE,
&newContext);
NS_RELEASE(pseudoTag);
}
else {
NS_ASSERTION(localContent, "non pseudo-element frame without content node");
aPresContext->ResolveStyleContextFor(content, aParentContext, PR_TRUE, &newContext);
}
NS_ASSERTION(newContext, "failed to get new style context");
if (newContext) {
if (newContext != oldContext) {
aMinChange = CaptureChange(oldContext, newContext, aFrame, content, aChangeList, aMinChange);
if (aMinChange < NS_STYLE_HINT_FRAMECHANGE) { // if frame gets regenerated, let it keep old context
aFrame->SetStyleContext(aPresContext, newContext);
}
// if old context had image and new context does not have the same image,
// stop the image load for the frame
const nsStyleBackground* oldColor = (const nsStyleBackground*)oldContext->GetStyleData(eStyleStruct_Background);
const nsStyleBackground* newColor = (const nsStyleBackground*)newContext->GetStyleData(eStyleStruct_Background);
if(oldColor->mBackgroundImage.Length() > 0 &&
oldColor->mBackgroundImage != newColor->mBackgroundImage ){
// stop the image loading for the frame, the image has changed
aPresContext->StopImagesFor(aFrame);
}
}
else {
// XXXdwh figure this out.
// oldContext->RemapStyle(aPresContext, PR_FALSE);
if (aAttribute && (aMinChange < NS_STYLE_HINT_REFLOW) &&
HasAttributeContent(oldContext, aAttrNameSpaceID, aAttribute)) {
aChangeList.AppendChange(aFrame, content, NS_STYLE_HINT_REFLOW);
}
}
NS_RELEASE(oldContext);
}
else {
NS_ERROR("resolve style context failed");
newContext = oldContext; // new context failed, recover... (take ref)
}
// do additional contexts
PRInt32 contextIndex = -1;
while (1 == 1) {
nsIStyleContext* oldExtraContext = nsnull;
result = aFrame->GetAdditionalStyleContext(++contextIndex, &oldExtraContext);
if (NS_SUCCEEDED(result)) {
if (oldExtraContext) {
nsIStyleContext* newExtraContext = nsnull;
oldExtraContext->GetPseudoType(pseudoTag);
NS_ASSERTION(pseudoTag, "extra style context is not pseudo element");
result = aPresContext->ResolvePseudoStyleContextFor(content, pseudoTag, newContext,
PR_FALSE, &newExtraContext);
NS_RELEASE(pseudoTag);
if (NS_SUCCEEDED(result) && newExtraContext) {
if (oldExtraContext != newExtraContext) {
aMinChange = CaptureChange(oldExtraContext, newExtraContext, aFrame,
content, aChangeList, aMinChange);
if (aMinChange < NS_STYLE_HINT_FRAMECHANGE) {
aFrame->SetAdditionalStyleContext(contextIndex, newExtraContext);
}
}
else {
// XXXdwh figure this out.
// oldExtraContext->RemapStyle(aPresContext, PR_FALSE);
if (aAttribute && (aMinChange < NS_STYLE_HINT_REFLOW) &&
HasAttributeContent(oldContext, aAttrNameSpaceID, aAttribute)) {
aChangeList.AppendChange(aFrame, content, NS_STYLE_HINT_REFLOW);
}
}
NS_RELEASE(newExtraContext);
}
NS_RELEASE(oldExtraContext);
}
}
else {
break;
}
}
// now look for undisplayed child content and pseudos
if (localContent && mUndisplayedMap) {
UndisplayedNode* undisplayed = mUndisplayedMap->GetFirstNode(localContent);
while (undisplayed) {
nsIStyleContext* undisplayedContext = nsnull;
undisplayed->mStyle->GetPseudoType(pseudoTag);
if (undisplayed->mContent && pseudoTag == nsnull) { // child content
aPresContext->ResolveStyleContextFor(undisplayed->mContent, newContext,
PR_TRUE, &undisplayedContext);
}
else { // pseudo element
NS_ASSERTION(pseudoTag, "pseudo element without tag");
aPresContext->ResolvePseudoStyleContextFor(localContent, pseudoTag, newContext, PR_FALSE,
&undisplayedContext);
}
NS_IF_RELEASE(pseudoTag);
if (undisplayedContext) {
if (undisplayedContext == undisplayed->mStyle) {
// XXXdwh figure this out.
// undisplayedContext->RemapStyle(aPresContext);
}
const nsStyleDisplay* display =
(const nsStyleDisplay*)undisplayedContext->GetStyleData(eStyleStruct_Display);
if (display->mDisplay != NS_STYLE_DISPLAY_NONE) {
aChangeList.AppendChange(nsnull, ((undisplayed->mContent) ? undisplayed->mContent : localContent),
NS_STYLE_HINT_FRAMECHANGE);
}
NS_RELEASE(undisplayedContext);
}
undisplayed = undisplayed->mNext;
}
}
aResultChange = aMinChange;
// now do children
PRInt32 listIndex = 0;
nsIAtom* childList = nsnull;
PRInt32 childChange;
nsIFrame* child;
do {
child = nsnull;
result = aFrame->FirstChild(aPresContext, childList, &child);
while ((NS_SUCCEEDED(result)) && (child)) {
nsFrameState state;
child->GetFrameState(&state);
if (NS_FRAME_OUT_OF_FLOW != (state & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that are in flow
nsCOMPtr<nsIAtom> frameType;
child->GetFrameType(getter_AddRefs(frameType));
if (nsLayoutAtoms::placeholderFrame == frameType.get()) { // placeholder
// get out of flow frame and recurse there
nsIFrame* outOfFlowFrame = ((nsPlaceholderFrame*)child)->GetOutOfFlowFrame();
NS_ASSERTION(outOfFlowFrame, "no out-of-flow frame");
if (outOfFlowFrame != resolvedDescendant) {
ReResolveStyleContext(aPresContext, outOfFlowFrame, nsnull, content,
aAttrNameSpaceID, aAttribute,
aChangeList, aMinChange, childChange);
} else {
NOISY_TRACE("out of flow frame already resolved as descendent\n");
}
// reresolve placeholder's context under out of flow frame
nsIStyleContext* outOfFlowContext;
outOfFlowFrame->GetStyleContext(&outOfFlowContext);
ReResolveStyleContext(aPresContext, child, outOfFlowContext, content,
kNameSpaceID_Unknown, nsnull,
aChangeList, aMinChange, childChange);
NS_RELEASE(outOfFlowContext);
}
else { // regular child frame
if (child != resolvedDescendant) {
ReResolveStyleContext(aPresContext, child, nsnull, content,
aAttrNameSpaceID, aAttribute,
aChangeList, aMinChange, childChange);
} else {
NOISY_TRACE_FRAME("child frame already resolved as descendent, skipping",aFrame);
}
}
}
child->GetNextSibling(&child);
}
NS_IF_RELEASE(childList);
aFrame->GetAdditionalChildListName(listIndex++, &childList);
} while (childList);
// XXX need to do overflow frames???
NS_RELEASE(newContext);
NS_IF_RELEASE(localContent);
NS_IF_RELEASE(aParentContext);
}
}
#else // NEW_CONTEXT_PARENTAGE_INVARIANT
void
FrameManager::ReResolveStyleContext(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIStyleContext* aParentContext,
nsIContent* aParentContent,
PRInt32 aAttrNameSpaceID,
nsIAtom* aAttribute,
nsStyleChangeList& aChangeList,
PRInt32 aMinChange,
PRInt32& aResultChange)
{
nsIStyleContext* oldContext = nsnull;
nsresult result = aFrame->GetStyleContext(&oldContext);
if (NS_SUCCEEDED(result) && oldContext) {
nsIAtom* pseudoTag = nsnull;
oldContext->GetPseudoType(pseudoTag);
nsIContent* localContent = nsnull;
nsIContent* content = nsnull;
result = aFrame->GetContent(&localContent);
if (NS_SUCCEEDED(result) && localContent) {
content = localContent;
}
else {
content = aParentContent;
}
if (aParentContent && aAttribute) { // attribute came from parent, we don't care about it here when recursing
nsFrameState frameState;
aFrame->GetFrameState(&frameState);
if (0 == (frameState & NS_FRAME_GENERATED_CONTENT)) { // keep it for generated content
aAttribute = nsnull;
}
}
// do primary context
nsIStyleContext* newContext = nsnull;
if (pseudoTag) {
aPresContext->ResolvePseudoStyleContextFor(aParentContent, pseudoTag, aParentContext, PR_FALSE,
&newContext);
NS_RELEASE(pseudoTag);
}
else {
NS_ASSERTION(localContent, "non pseudo-element frame without content node");
aPresContext->ResolveStyleContextFor(content, aParentContext, PR_TRUE, &newContext);
}
NS_ASSERTION(newContext, "failed to get new style context");
if (newContext) {
if (newContext != oldContext) {
aMinChange = CaptureChange(oldContext, newContext, aFrame, content, aChangeList, aMinChange);
if (aMinChange < NS_STYLE_HINT_FRAMECHANGE) { // if frame gets regenerated, let it keep old context
aFrame->SetStyleContext(aPresContext, newContext);
}
// if old context had image and new context does not have the same image,
// stop the image load for the frame
nsStyleColor* oldColor;
nsStyleColor* newColor;
oldContext->GetStyle(eStyleStruct_Color, &oldColor);
newContext->GetStyle(eStyleStruct_Color, &newColor);
if(oldColor.mBackgroundImage.Length() > 0 &&
oldColor.mBackgroundImage != newColor.mBackgroundImage ){
// stop the image loading for the frame, the image has changed
aPresContext->StopImagesFor(aFrame);
}
}
else {
// XXXdwh figure this out.
// oldContext->RemapStyle(aPresContext, PR_FALSE);
if (aAttribute && (aMinChange < NS_STYLE_HINT_REFLOW) &&
HasAttributeContent(oldContext, aAttrNameSpaceID, aAttribute)) {
aChangeList.AppendChange(aFrame, content, NS_STYLE_HINT_REFLOW);
}
}
NS_RELEASE(oldContext);
}
else {
NS_ERROR("resolve style context failed");
newContext = oldContext; // new context failed, recover... (take ref)
}
// do additional contexts
PRInt32 contextIndex = -1;
while (1 == 1) {
nsIStyleContext* oldExtraContext = nsnull;
result = aFrame->GetAdditionalStyleContext(++contextIndex, &oldExtraContext);
if (NS_SUCCEEDED(result)) {
if (oldExtraContext) {
nsIStyleContext* newExtraContext = nsnull;
oldExtraContext->GetPseudoType(pseudoTag);
NS_ASSERTION(pseudoTag, "extra style context is not pseudo element");
result = aPresContext->ResolvePseudoStyleContextFor(content, pseudoTag, newContext,
PR_FALSE, &newExtraContext);
NS_RELEASE(pseudoTag);
if (NS_SUCCEEDED(result) && newExtraContext) {
if (oldExtraContext != newExtraContext) {
aMinChange = CaptureChange(oldExtraContext, newExtraContext, aFrame,
content, aChangeList, aMinChange);
if (aMinChange < NS_STYLE_HINT_FRAMECHANGE) {
aFrame->SetAdditionalStyleContext(contextIndex, newExtraContext);
}
}
else {
// XXXdwh figure this out.
// oldExtraContext->RemapStyle(aPresContext, PR_FALSE);
if (aAttribute && (aMinChange < NS_STYLE_HINT_REFLOW) &&
HasAttributeContent(oldContext, aAttrNameSpaceID, aAttribute)) {
aChangeList.AppendChange(aFrame, content, NS_STYLE_HINT_REFLOW);
}
}
NS_RELEASE(newExtraContext);
}
NS_RELEASE(oldExtraContext);
}
}
else {
break;
}
}
// now look for undisplayed child content and pseudos
if (localContent && mUndisplayedMap) {
UndisplayedNode* undisplayed = mUndisplayedMap->GetFirstNode(localContent);
while (undisplayed) {
nsIStyleContext* undisplayedContext = nsnull;
undisplayed->mStyle->GetPseudoType(pseudoTag);
if (undisplayed->mContent && pseudoTag == nsnull) { // child content
aPresContext->ResolveStyleContextFor(undisplayed->mContent, newContext,
PR_TRUE, &undisplayedContext);
}
else { // pseudo element
NS_ASSERTION(pseudoTag, "pseudo element without tag");
aPresContext->ResolvePseudoStyleContextFor(localContent, pseudoTag, newContext, PR_FALSE,
&undisplayedContext);
}
NS_IF_RELEASE(pseudoTag);
if (undisplayedContext) {
if (undisplayedContext == undisplayed->mStyle) {
// XXXdwh figure this out.
// undisplayedContext->RemapStyle(aPresContext);
}
const nsStyleDisplay* display =
(const nsStyleDisplay*)undisplayedContext->GetStyleData(eStyleStruct_Display);
if (display->mDisplay != NS_STYLE_DISPLAY_NONE) {
aChangeList.AppendChange(nsnull, ((undisplayed->mContent) ? undisplayed->mContent : localContent),
NS_STYLE_HINT_FRAMECHANGE);
}
NS_RELEASE(undisplayedContext);
}
undisplayed = undisplayed->mNext;
}
}
aResultChange = aMinChange;
// now do children
PRInt32 listIndex = 0;
nsIAtom* childList = nsnull;
PRInt32 childChange;
nsIFrame* child;
do {
child = nsnull;
result = aFrame->FirstChild(aPresContext, childList, &child);
while ((NS_SUCCEEDED(result)) && (child)) {
nsFrameState state;
child->GetFrameState(&state);
if (NS_FRAME_OUT_OF_FLOW != (state & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that are in flow
nsCOMPtr<nsIAtom> frameType;
child->GetFrameType(getter_AddRefs(frameType));
if (nsLayoutAtoms::placeholderFrame == frameType.get()) { // placeholder
// get out of flow frame and recurse there
nsIFrame* outOfFlowFrame = ((nsPlaceholderFrame*)child)->GetOutOfFlowFrame();
NS_ASSERTION(outOfFlowFrame, "no out-of-flow frame");
ReResolveStyleContext(aPresContext, outOfFlowFrame, newContext, content,
aAttrNameSpaceID, aAttribute,
aChangeList, aMinChange, childChange);
// reresolve placeholder's context under out of flow frame
nsIStyleContext* outOfFlowContext;
outOfFlowFrame->GetStyleContext(&outOfFlowContext);
ReResolveStyleContext(aPresContext, child, outOfFlowContext, content,
kNameSpaceID_Unknown, nsnull,
aChangeList, aMinChange, childChange);
NS_RELEASE(outOfFlowContext);
}
else { // regular child frame
ReResolveStyleContext(aPresContext, child, newContext, content,
aAttrNameSpaceID, aAttribute,
aChangeList, aMinChange, childChange);
}
}
child->GetNextSibling(&child);
}
NS_IF_RELEASE(childList);
aFrame->GetAdditionalChildListName(listIndex++, &childList);
} while (childList);
// XXX need to do overflow frames???
NS_RELEASE(newContext);
NS_IF_RELEASE(localContent);
}
}
#endif // NEW_CONTEXT_PARENTAGE_INVARIANT
NS_IMETHODIMP
FrameManager::ComputeStyleChangeFor(nsIPresContext* aPresContext,
nsIFrame* aFrame,
PRInt32 aAttrNameSpaceID,
nsIAtom* aAttribute,
nsStyleChangeList& aChangeList,
PRInt32 aMinChange,
PRInt32& aTopLevelChange)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
aTopLevelChange = NS_STYLE_HINT_NONE;
nsIFrame* frame = aFrame;
do {
nsIStyleContext* styleContext = nsnull;
frame->GetStyleContext(&styleContext);
nsIStyleContext* parentContext = styleContext->GetParent();
PRInt32 frameChange;
ReResolveStyleContext(aPresContext, frame, parentContext, nsnull,
aAttrNameSpaceID, aAttribute,
aChangeList, aMinChange, frameChange);
#ifdef NS_DEBUG
VerifyStyleTree(aPresContext, frame, parentContext);
#endif
NS_IF_RELEASE(parentContext);
NS_RELEASE(styleContext);
if (aTopLevelChange < frameChange) {
aTopLevelChange = frameChange;
}
if (aTopLevelChange >= NS_STYLE_HINT_REFLOW) {
// If it's going to cause a reflow (or worse), then don't touch
// the any continuations: they must be taken care of by the reflow.
#ifdef NS_DEBUG
nsIFrame* prevInFlow;
frame->GetPrevInFlow(&prevInFlow);
NS_ASSERTION(!prevInFlow, "continuing frame had more severe impact than first-in-flow");
#endif
break;
}
frame->GetNextInFlow(&frame);
} while (frame);
return NS_OK;
}
NS_IMETHODIMP
FrameManager::AttributeAffectsStyle(nsIAtom *aAttribute, nsIContent *aContent,
PRBool &aAffects)
{
nsresult rv = NS_OK;
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
nsCOMPtr<nsIXMLContent> xml(do_QueryInterface(aContent));
if (xml) {
rv = mStyleSet->AttributeAffectsStyle(aAttribute, aContent, aAffects);
} else {
// not an XML element, so assume it is an HTML element and further assume that
// any attribute may affect style
// NOTE: we could list all of the presentation-hint attributes and check them,
// but there are a lot of them and this is safer.
aAffects = PR_TRUE;
rv = NS_OK;
}
return rv;
}
// Capture state for a given frame.
// Accept a content id here, in some cases we may not have content (scroll position)
NS_IMETHODIMP
FrameManager::CaptureFrameStateFor(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsILayoutHistoryState* aState,
nsIStatefulFrame::SpecialStateID aID)
{
NS_ENSURE_TRUE(mPresShell && aFrame && aState, NS_ERROR_FAILURE);
// Only capture state for stateful frames
nsIStatefulFrame* statefulFrame = nsnull;
aFrame->QueryInterface(NS_GET_IID(nsIStatefulFrame), (void**) &statefulFrame);
if (!statefulFrame) {
return NS_OK;
}
// Capture the state, exit early if we get null (nothing to save)
nsCOMPtr<nsIPresState> frameState;
nsresult rv = NS_OK;
rv = statefulFrame->SaveState(aPresContext, getter_AddRefs(frameState));
if (!frameState) {
return NS_OK;
}
// Generate the hash key to store the state under
// Exit early if we get empty key
nsCOMPtr<nsIContent> content;
rv = aFrame->GetContent(getter_AddRefs(content));
nsCAutoString stateKey;
rv = GenerateStateKey(content, aID, stateKey);
if(NS_FAILED(rv) || stateKey.IsEmpty()) {
return rv;
}
// Store the state
return aState->AddState(stateKey, frameState);
}
NS_IMETHODIMP
FrameManager::CaptureFrameState(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsILayoutHistoryState* aState)
{
nsresult rv = NS_OK;
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_PRECONDITION(nsnull != aFrame && nsnull != aState, "null parameters passed in");
rv = CaptureFrameStateFor(aPresContext, aFrame, aState);
// Now capture state recursively for the frame hierarchy rooted at aFrame
nsIAtom* childListName = nsnull;
PRInt32 childListIndex = 0;
do {
nsIFrame* childFrame;
aFrame->FirstChild(aPresContext, childListName, &childFrame);
while (childFrame) {
rv = CaptureFrameState(aPresContext, childFrame, aState);
// Get the next sibling child frame
childFrame->GetNextSibling(&childFrame);
}
NS_IF_RELEASE(childListName);
aFrame->GetAdditionalChildListName(childListIndex++, &childListName);
} while (childListName);
return rv;
}
// Restore state for a given frame.
// Accept a content id here, in some cases we may not have content (scroll position)
NS_IMETHODIMP
FrameManager::RestoreFrameStateFor(nsIPresContext* aPresContext, nsIFrame* aFrame, nsILayoutHistoryState* aState, nsIStatefulFrame::SpecialStateID aID)
{
NS_ENSURE_TRUE(mPresShell && aFrame && aState, NS_ERROR_FAILURE);
// Only capture state for stateful frames
nsIStatefulFrame* statefulFrame = nsnull;
aFrame->QueryInterface(NS_GET_IID(nsIStatefulFrame), (void**) &statefulFrame);
if (!statefulFrame) {
return NS_OK;
}
// Generate the hash key the state was stored under
// Exit early if we get empty key
nsresult rv = NS_OK;
nsCOMPtr<nsIContent> content;
rv = aFrame->GetContent(getter_AddRefs(content));
// If we don't have content, we can't generate a hash
// key and there's probably no state information for us.
if (!content) {
return rv;
}
nsCAutoString stateKey;
rv = GenerateStateKey(content, aID, stateKey);
if(NS_FAILED(rv) || stateKey.IsEmpty()) {
return rv;
}
// Get the state from the hash
nsCOMPtr<nsIPresState> frameState;
rv = aState->GetState(stateKey, getter_AddRefs(frameState));
if (!frameState) {
return NS_OK;
}
// Restore it
rv = statefulFrame->RestoreState(aPresContext, frameState);
NS_ENSURE_SUCCESS(rv, rv);
// If we restore ok, remove the state from the state table
return aState->RemoveState(stateKey);
}
NS_IMETHODIMP
FrameManager::RestoreFrameState(nsIPresContext* aPresContext, nsIFrame* aFrame, nsILayoutHistoryState* aState)
{
nsresult rv = NS_OK;
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_PRECONDITION(nsnull != aFrame && nsnull != aState, "null parameters passed in");
rv = RestoreFrameStateFor(aPresContext, aFrame, aState);
// Now restore state recursively for the frame hierarchy rooted at aFrame
nsIAtom* childListName = nsnull;
PRInt32 childListIndex = 0;
do {
nsIFrame* childFrame;
aFrame->FirstChild(aPresContext, childListName, &childFrame);
while (childFrame) {
rv = RestoreFrameState(aPresContext, childFrame, aState);
// Get the next sibling child frame
childFrame->GetNextSibling(&childFrame);
}
NS_IF_RELEASE(childListName);
aFrame->GetAdditionalChildListName(childListIndex++, &childListName);
} while (childListName);
return rv;
}
static inline void KeyAppendSep(nsCString& aKey)
{
if (!aKey.IsEmpty()) {
aKey.Append(">");
}
}
static inline void KeyAppendString(nsAReadableString& aString, nsCString& aKey)
{
KeyAppendSep(aKey);
// Could escape separator here if collisions happen. > is not a legal char
// for a name or type attribute, so we should be safe avoiding that extra work.
aKey.Append(NS_ConvertUCS2toUTF8(aString));
}
static inline void KeyAppendInt(PRInt32 aInt, nsCString& aKey)
{
KeyAppendSep(aKey);
aKey.AppendInt(aInt);
}
static inline void KeyAppendAtom(nsIAtom* aAtom, nsCString& aKey)
{
NS_PRECONDITION(aAtom, "KeyAppendAtom: aAtom can not be null!\n");
const PRUnichar* atomString = nsnull;
aAtom->GetUnicode(&atomString);
KeyAppendString(nsDependentString(atomString), aKey);
}
static inline PRBool IsAutocompleteOff(nsIDOMElement* aElement)
{
nsAutoString autocomplete;
aElement->GetAttribute(NS_LITERAL_STRING("autocomplete"), autocomplete);
ToLowerCase(autocomplete);
return autocomplete.Equals(NS_LITERAL_STRING("off"));
}
NS_IMETHODIMP
FrameManager::GenerateStateKey(nsIContent* aContent,
nsIStatefulFrame::SpecialStateID aID,
nsCString& aKey)
{
aKey.Truncate();
// SpecialStateID case - e.g. scrollbars around the content window
// The key in this case is the special state id (always < min(contentID))
if (nsIStatefulFrame::eNoID != aID) {
KeyAppendInt(aID, aKey);
return NS_OK;
}
// We must have content if we're not using a special state id
NS_ENSURE_TRUE(aContent, NS_ERROR_FAILURE);
// Don't capture state for anonymous content
PRUint32 contentID;
aContent->GetContentID(&contentID);
if (!contentID) {
return NS_OK;
}
nsCOMPtr<nsIDOMElement> element(do_QueryInterface(aContent));
if (element && IsAutocompleteOff(element)) {
return NS_OK;
}
// If we have a dom element, add tag/type/name to hash key
// This is paranoia, but guarantees that we won't restore
// state to the wrong type of control.
nsCOMPtr<nsIAtom> tag;
if (aContent->IsContentOfType(nsIContent::eHTML_FORM_CONTROL)) {
aContent->GetTag(*getter_AddRefs(tag));
KeyAppendAtom(tag, aKey);
nsAutoString name;
aContent->GetAttr(kNameSpaceID_HTML, nsHTMLAtoms::name, name);
KeyAppendString(name, aKey);
}
// If we have a form control and can calculate form information, use
// that as the key - it is more reliable than contentID.
// Important to have a unique key, and tag/type/name may not be.
nsCOMPtr<nsIFormControl> control(do_QueryInterface(aContent));
PRBool generatedUniqueKey = PR_FALSE;
if (control && mHTMLFormControls && mHTMLForms) {
if (tag == nsHTMLAtoms::input) {
PRInt32 type;
control->GetType(&type);
KeyAppendInt(type, aKey);
}
// If in a form, add form name / index of form / index in form
PRInt32 index = -1;
nsCOMPtr<nsIDOMHTMLFormElement> formElement;
control->GetForm(getter_AddRefs(formElement));
if (formElement) {
if (IsAutocompleteOff(formElement)) {
aKey.Truncate();
return NS_OK;
}
nsAutoString formName;
formElement->GetName(formName);
KeyAppendString(formName, aKey);
nsCOMPtr<nsIContent> formContent(do_QueryInterface(formElement));
mHTMLForms->IndexOf(formContent, index, PR_FALSE);
NS_ASSERTION(index > -1,
"nsFrameManager::GenerateStateKey didn't find form index!");
if (index > -1) {
KeyAppendInt(index, aKey);
nsCOMPtr<nsIForm> form(do_QueryInterface(formElement));
form->IndexOfControl(control, &index);
NS_ASSERTION(index > -1,
"nsFrameManager::GenerateStateKey didn't find form control index!");
if (index > -1) {
KeyAppendInt(index, aKey);
generatedUniqueKey = PR_TRUE;
}
}
} else {
// If not in a form, add index of control in document
// Less desirable than indexing by form info.
// Hash by index of control in doc (we are not in a form)
// These are important as they are unique, and type/name may not be.
mHTMLFormControls->IndexOf(aContent, index, PR_FALSE);
NS_ASSERTION(index > -1,
"nsFrameManager::GenerateStateKey didn't find content by type!");
if (index > -1) {
KeyAppendInt(index, aKey);
generatedUniqueKey = PR_TRUE;
}
}
}
if (!generatedUniqueKey) {
// Either we didn't have a form control or we aren't in an HTML document
// so we can't figure out form info, hash by content ID instead :(
KeyAppendInt(contentID, aKey);
}
return NS_OK;
}
//----------------------------------------------------------------------
static PLHashNumber
HashKey(void* key)
{
return NS_PTR_TO_INT32(key);
}
static PRIntn
CompareKeys(void* key1, void* key2)
{
return key1 == key2;
}
MOZ_DECL_CTOR_COUNTER(FrameHashTable)
FrameHashTable::FrameHashTable(PRUint32 aNumBuckets)
{
MOZ_COUNT_CTOR(FrameHashTable);
mTable = PL_NewHashTable(aNumBuckets, (PLHashFunction)HashKey,
(PLHashComparator)CompareKeys,
(PLHashComparator)nsnull,
nsnull, nsnull);
}
FrameHashTable::~FrameHashTable()
{
MOZ_COUNT_DTOR(FrameHashTable);
PL_HashTableDestroy(mTable);
}
void*
FrameHashTable::Get(void* aKey)
{
PRInt32 hashCode = NS_PTR_TO_INT32(aKey);
PLHashEntry** hep = PL_HashTableRawLookup(mTable, hashCode, aKey);
PLHashEntry* he = *hep;
if (he) {
return he->value;
}
return nsnull;
}
void*
FrameHashTable::Put(void* aKey, void* aData)
{
PRInt32 hashCode = NS_PTR_TO_INT32(aKey);
PLHashEntry** hep = PL_HashTableRawLookup(mTable, hashCode, aKey);
PLHashEntry* he = *hep;
if (he) {
void* oldValue = he->value;
he->value = aData;
return oldValue;
}
PL_HashTableRawAdd(mTable, hep, hashCode, aKey, aData);
return nsnull;
}
void*
FrameHashTable::Remove(void* aKey)
{
PRInt32 hashCode = NS_PTR_TO_INT32(aKey);
PLHashEntry** hep = PL_HashTableRawLookup(mTable, hashCode, aKey);
PLHashEntry* he = *hep;
void* oldValue = nsnull;
if (he) {
oldValue = he->value;
PL_HashTableRawRemove(mTable, hep, he);
}
return oldValue;
}
static PRIntn PR_CALLBACK
RemoveEntry(PLHashEntry* he, PRIntn i, void* arg)
{
// Remove and free this entry and continue enumerating
return HT_ENUMERATE_REMOVE | HT_ENUMERATE_NEXT;
}
void
FrameHashTable::Clear()
{
PL_HashTableEnumerateEntries(mTable, RemoveEntry, 0);
}
#ifdef NS_DEBUG
static PRIntn PR_CALLBACK
EnumEntries(PLHashEntry* he, PRIntn i, void* arg)
{
// Continue enumerating
return HT_ENUMERATE_NEXT;
}
void
FrameHashTable::Dump(FILE* fp)
{
PL_HashTableDump(mTable, EnumEntries, fp);
}
#endif
void
FrameManager::DestroyPropertyList(nsIPresContext* aPresContext)
{
if (mPropertyList) {
while (mPropertyList) {
PropertyList* tmp = mPropertyList;
mPropertyList = mPropertyList->mNext;
tmp->RemoveAllProperties(aPresContext);
delete tmp;
}
}
}
FrameManager::PropertyList*
FrameManager::GetPropertyListFor(nsIAtom* aPropertyName) const
{
PropertyList* result;
for (result = mPropertyList; result; result = result->mNext) {
if (result->mName.get() == aPropertyName) {
break;
}
}
return result;
}
void
FrameManager::RemoveAllPropertiesFor(nsIPresContext* aPresContext,
nsIFrame* aFrame)
{
for (PropertyList* prop = mPropertyList; prop; prop = prop->mNext) {
prop->RemovePropertyForFrame(aPresContext, aFrame);
}
}
NS_IMETHODIMP
FrameManager::GetFrameProperty(nsIFrame* aFrame,
nsIAtom* aPropertyName,
PRUint32 aOptions,
void** aPropertyValue)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_ENSURE_ARG_POINTER(aPropertyName);
PropertyList* propertyList = GetPropertyListFor(aPropertyName);
nsresult result;
if (propertyList) {
result = propertyList->mFrameValueMap->Search(aFrame, aOptions, aPropertyValue);
} else {
*aPropertyValue = 0;
result = NS_IFRAME_MGR_PROP_NOT_THERE;
}
return result;
}
NS_IMETHODIMP
FrameManager::SetFrameProperty(nsIFrame* aFrame,
nsIAtom* aPropertyName,
void* aPropertyValue,
NSFMPropertyDtorFunc aPropDtorFunc)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_ENSURE_ARG_POINTER(aPropertyName);
PropertyList* propertyList = GetPropertyListFor(aPropertyName);
nsresult result = NS_OK;
if (propertyList) {
// Make sure the dtor function matches
if (aPropDtorFunc != propertyList->mDtorFunc) {
return NS_ERROR_INVALID_ARG;
}
} else {
propertyList = new PropertyList(aPropertyName, aPropDtorFunc, mDSTNodeArena);
if (!propertyList) {
return NS_ERROR_OUT_OF_MEMORY;
}
propertyList->mNext = mPropertyList;
mPropertyList = propertyList;
}
// The current property value (if there is one) is replaced and the current
// value is destroyed
void* oldValue;
result = propertyList->mFrameValueMap->Insert(aFrame, aPropertyValue, &oldValue);
if (NS_DST_VALUE_OVERWRITTEN == result) {
if (propertyList->mDtorFunc) {
nsCOMPtr<nsIPresContext> presContext;
mPresShell->GetPresContext(getter_AddRefs(presContext));
propertyList->mDtorFunc(presContext, aFrame, aPropertyName, oldValue);
}
}
return result;
}
NS_IMETHODIMP
FrameManager::RemoveFrameProperty(nsIFrame* aFrame,
nsIAtom* aPropertyName)
{
NS_ENSURE_TRUE(mPresShell, NS_ERROR_NOT_AVAILABLE);
NS_ENSURE_ARG_POINTER(aPropertyName);
PropertyList* propertyList = GetPropertyListFor(aPropertyName);
nsresult result = NS_IFRAME_MGR_PROP_NOT_THERE;
if (propertyList) {
nsCOMPtr<nsIPresContext> presContext;
mPresShell->GetPresContext(getter_AddRefs(presContext));
if (propertyList->RemovePropertyForFrame(presContext, aFrame)) {
result = NS_OK;
}
}
return result;
}
//----------------------------------------------------------------------
MOZ_DECL_CTOR_COUNTER(UndisplayedMap)
UndisplayedMap::UndisplayedMap(PRUint32 aNumBuckets)
{
MOZ_COUNT_CTOR(UndisplayedMap);
mTable = PL_NewHashTable(aNumBuckets, (PLHashFunction)HashKey,
(PLHashComparator)CompareKeys,
(PLHashComparator)nsnull,
nsnull, nsnull);
mLastLookup = nsnull;
}
UndisplayedMap::~UndisplayedMap(void)
{
MOZ_COUNT_DTOR(UndisplayedMap);
Clear();
PL_HashTableDestroy(mTable);
}
PLHashEntry**
UndisplayedMap::GetEntryFor(nsIContent* aParentContent)
{
if (mLastLookup && (aParentContent == (*mLastLookup)->key)) {
return mLastLookup;
}
PLHashNumber hashCode = NS_PTR_TO_INT32(aParentContent);
PLHashEntry** entry = PL_HashTableRawLookup(mTable, hashCode, aParentContent);
if (*entry) {
mLastLookup = entry;
}
return entry;
}
UndisplayedNode*
UndisplayedMap::GetFirstNode(nsIContent* aParentContent)
{
PLHashEntry** entry = GetEntryFor(aParentContent);
if (*entry) {
return (UndisplayedNode*)((*entry)->value);
}
return nsnull;
}
nsresult
UndisplayedMap::AppendNodeFor(UndisplayedNode* aNode, nsIContent* aParentContent)
{
PLHashEntry** entry = GetEntryFor(aParentContent);
if (*entry) {
UndisplayedNode* node = (UndisplayedNode*)((*entry)->value);
while (node->mNext) {
NS_ASSERTION((node->mContent != aNode->mContent) ||
((node->mContent == nsnull) &&
(node->mStyle != aNode->mStyle)), "node in map twice");
node = node->mNext;
}
node->mNext = aNode;
}
else {
PLHashNumber hashCode = NS_PTR_TO_INT32(aParentContent);
PL_HashTableRawAdd(mTable, entry, hashCode, aParentContent, aNode);
mLastLookup = nsnull; // hashtable may have shifted bucket out from under us
}
return NS_OK;
}
nsresult
UndisplayedMap::AddNodeFor(nsIContent* aParentContent, nsIContent* aChild,
nsIStyleContext* aStyle)
{
UndisplayedNode* node = new UndisplayedNode(aChild, aStyle);
if (! node) {
return NS_ERROR_OUT_OF_MEMORY;
}
return AppendNodeFor(node, aParentContent);
}
nsresult
UndisplayedMap::AddNodeFor(nsIContent* aParentContent, nsIStyleContext* aPseudoStyle)
{
UndisplayedNode* node = new UndisplayedNode(aPseudoStyle);
if (! node) {
return NS_ERROR_OUT_OF_MEMORY;
}
return AppendNodeFor(node, aParentContent);
}
nsresult
UndisplayedMap::GetNodeFor(nsIContent* aContent, nsIStyleContext** aResult)
{
PLHashEntry** entry = GetEntryFor(aContent);
if (*entry) {
UndisplayedNode* node = (UndisplayedNode*)((*entry)->value);
*aResult = node->mStyle;
NS_IF_ADDREF(*aResult);
}
else
*aResult = nsnull;
return NS_OK;
}
nsresult
UndisplayedMap::RemoveNodeFor(nsIContent* aParentContent, UndisplayedNode* aNode)
{
PLHashEntry** entry = GetEntryFor(aParentContent);
NS_ASSERTION(*entry, "content not in map");
if (*entry) {
if ((UndisplayedNode*)((*entry)->value) == aNode) { // first node
if (aNode->mNext) {
(*entry)->value = aNode->mNext;
aNode->mNext = nsnull;
}
else {
PL_HashTableRawRemove(mTable, entry, *entry);
mLastLookup = nsnull; // hashtable may have shifted bucket out from under us
}
}
else {
UndisplayedNode* node = (UndisplayedNode*)((*entry)->value);
while (node->mNext) {
if (node->mNext == aNode) {
node->mNext = aNode->mNext;
aNode->mNext = nsnull;
break;
}
node = node->mNext;
}
}
}
delete aNode;
return NS_OK;
}
nsresult
UndisplayedMap::RemoveNodesFor(nsIContent* aParentContent)
{
PLHashEntry** entry = GetEntryFor(aParentContent);
NS_ASSERTION(entry, "content not in map");
if (*entry) {
UndisplayedNode* node = (UndisplayedNode*)((*entry)->value);
delete node;
if (entry == mLastLookup) {
mLastLookup = nsnull;
}
PL_HashTableRawRemove(mTable, entry, *entry);
}
return NS_OK;
}
static PRIntn PR_CALLBACK
RemoveUndisplayedEntry(PLHashEntry* he, PRIntn i, void* arg)
{
UndisplayedNode* node = (UndisplayedNode*)(he->value);
delete node;
// Remove and free this entry and continue enumerating
return HT_ENUMERATE_REMOVE | HT_ENUMERATE_NEXT;
}
void
UndisplayedMap::Clear(void)
{
mLastLookup = nsnull;
PL_HashTableEnumerateEntries(mTable, RemoveUndisplayedEntry, 0);
}
//----------------------------------------------------------------------
FrameManager::PropertyList::PropertyList(nsIAtom* aName,
NSFMPropertyDtorFunc aDtorFunc,
nsDST::NodeArena* aDSTNodeArena)
: mName(aName), mFrameValueMap(new nsDST(aDSTNodeArena)),
mDtorFunc(aDtorFunc), mNext(nsnull)
{
}
FrameManager::PropertyList::~PropertyList()
{
delete mFrameValueMap;
}
class DestroyPropertyValuesFunctor : public nsDSTNodeFunctor {
public:
DestroyPropertyValuesFunctor(nsIPresContext* aPresContext,
nsIAtom* aPropertyName,
NSFMPropertyDtorFunc aDtorFunc)
: mPresContext(aPresContext), mPropertyName(aPropertyName), mDtorFunc(aDtorFunc) {}
virtual void operator () (void *aKey, void *aValue) {
mDtorFunc(mPresContext, (nsIFrame*)aKey, mPropertyName, aValue);
}
nsIPresContext* mPresContext;
nsIAtom* mPropertyName;
NSFMPropertyDtorFunc mDtorFunc;
};
void
FrameManager::PropertyList::RemoveAllProperties(nsIPresContext* aPresContext)
{
if (mDtorFunc) {
DestroyPropertyValuesFunctor functor(aPresContext, mName, mDtorFunc);
// Enumerate any remaining frame/value pairs and destroy the value object
mFrameValueMap->Enumerate(functor);
}
}
PRBool
FrameManager::PropertyList::RemovePropertyForFrame(nsIPresContext* aPresContext,
nsIFrame* aFrame)
{
void* value;
nsresult result;
// If the property exists, then we need to run the dtor function so
// do a search with the option to remove the key/value pair
result = mFrameValueMap->Search(aFrame, NS_DST_REMOVE_KEY_VALUE, &value);
if (NS_OK == result) {
// The property was set
if (mDtorFunc) {
// Destroy the property value
mDtorFunc(aPresContext, aFrame, mName, value);
}
return PR_TRUE;
}
return PR_FALSE;
}
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