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gecko-dev/layout/base/nsPresShell.cpp
troy%netscape.com 081c78e696 First of a few changes to allow frames to have multiple child lists. 
FirstChild() now takes an additional argument which is the name of the
child list.
1998-11-09 19:40:27 +00:00

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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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsIPresShell.h"
#include "nsIPresContext.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIDocumentObserver.h"
#include "nsIStyleSet.h"
#include "nsIStyleContext.h"
#include "nsFrame.h"
#include "nsIReflowCommand.h"
#include "nsIViewManager.h"
#include "nsCRT.h"
#include "plhash.h"
#include "prlog.h"
#include "nsVoidArray.h"
#include "nsIPref.h"
#include "nsIViewObserver.h"
#include "nsContainerFrame.h"
#include "nsHTMLIIDs.h"
#include "nsIDeviceContext.h"
static PRBool gsNoisyRefs = PR_FALSE;
#undef NOISY
#if 0
static PLHashNumber
HashKey(nsIFrame* key)
{
return (PLHashNumber) key;
}
static PRIntn
CompareKeys(nsIFrame* key1, nsIFrame* key2)
{
return key1 == key2;
}
class FrameHashTable {
public:
FrameHashTable();
~FrameHashTable();
void* Get(nsIFrame* aKey);
void* Put(nsIFrame* aKey, void* aValue);
void* Remove(nsIFrame* aKey);
protected:
PLHashTable* mTable;
};
FrameHashTable::FrameHashTable()
{
mTable = PL_NewHashTable(8, (PLHashFunction) HashKey,
(PLHashComparator) CompareKeys,
(PLHashComparator) nsnull,
nsnull, nsnull);
}
FrameHashTable::~FrameHashTable()
{
// XXX if debugging then we should assert that the table is empty
PL_HashTableDestroy(mTable);
}
/**
* Get the data associated with a frame.
*/
void*
FrameHashTable::Get(nsIFrame* aKey)
{
PRInt32 hashCode = (PRInt32) aKey;
PLHashEntry** hep = PL_HashTableRawLookup(mTable, hashCode, aKey);
PLHashEntry* he = *hep;
if (nsnull != he) {
return he->value;
}
return nsnull;
}
/**
* Create an association between a frame and some data. This call
* returns an old association if there was one (or nsnull if there
* wasn't).
*/
void*
FrameHashTable::Put(nsIFrame* aKey, void* aData)
{
PRInt32 hashCode = (PRInt32) aKey;
PLHashEntry** hep = PL_HashTableRawLookup(mTable, hashCode, aKey);
PLHashEntry* he = *hep;
if (nsnull != he) {
void* oldValue = he->value;
he->value = aData;
return oldValue;
}
PL_HashTableRawAdd(mTable, hep, hashCode, aKey, aData);
return nsnull;
}
/**
* Remove an association between a frame and it's data. This returns
* the old associated data.
*/
void*
FrameHashTable::Remove(nsIFrame* aKey)
{
PRInt32 hashCode = (PRInt32) aKey;
PLHashEntry** hep = PL_HashTableRawLookup(mTable, hashCode, aKey);
PLHashEntry* he = *hep;
void* oldValue = nsnull;
if (nsnull != he) {
oldValue = he->value;
PL_HashTableRawRemove(mTable, hep, he);
}
return oldValue;
}
#endif
//----------------------------------------------------------------------
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
static NS_DEFINE_IID(kIPresShellIID, NS_IPRESSHELL_IID);
static NS_DEFINE_IID(kIDocumentObserverIID, NS_IDOCUMENT_OBSERVER_IID);
static NS_DEFINE_IID(kIViewObserverIID, NS_IVIEWOBSERVER_IID);
class PresShell : public nsIPresShell, public nsIViewObserver,
private nsIDocumentObserver
{
public:
PresShell();
void* operator new(size_t sz) {
void* rv = new char[sz];
nsCRT::zero(rv, sz);
return rv;
}
// nsISupports
NS_DECL_ISUPPORTS
// nsIDocumentObserver
NS_IMETHOD BeginUpdate(nsIDocument *aDocument);
NS_IMETHOD EndUpdate(nsIDocument *aDocument);
NS_IMETHOD BeginLoad(nsIDocument *aDocument);
NS_IMETHOD EndLoad(nsIDocument *aDocument);
NS_IMETHOD BeginReflow(nsIDocument *aDocument, nsIPresShell* aShell);
NS_IMETHOD EndReflow(nsIDocument *aDocument, nsIPresShell* aShell);
NS_IMETHOD ContentChanged(nsIDocument *aDocument,
nsIContent* aContent,
nsISupports* aSubContent);
NS_IMETHOD AttributeChanged(nsIDocument *aDocument,
nsIContent* aContent,
nsIAtom* aAttribute,
PRInt32 aHint);
NS_IMETHOD ContentAppended(nsIDocument *aDocument,
nsIContent* aContainer,
PRInt32 aNewIndexInContainer);
NS_IMETHOD ContentInserted(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
PRInt32 aIndexInContainer);
NS_IMETHOD ContentReplaced(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aOldChild,
nsIContent* aNewChild,
PRInt32 aIndexInContainer);
NS_IMETHOD ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
PRInt32 aIndexInContainer);
NS_IMETHOD StyleSheetAdded(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet);
NS_IMETHOD DocumentWillBeDestroyed(nsIDocument *aDocument);
// nsIPresShell
NS_IMETHOD Init(nsIDocument* aDocument,
nsIPresContext* aPresContext,
nsIViewManager* aViewManager,
nsIStyleSet* aStyleSet);
virtual nsIDocument* GetDocument();
virtual nsIPresContext* GetPresContext();
virtual nsIViewManager* GetViewManager();
virtual nsIStyleSet* GetStyleSet();
NS_IMETHOD EnterReflowLock();
NS_IMETHOD ExitReflowLock();
virtual void BeginObservingDocument();
virtual void EndObservingDocument();
NS_IMETHOD InitialReflow(nscoord aWidth, nscoord aHeight);
NS_IMETHOD ResizeReflow(nscoord aWidth, nscoord aHeight);
NS_IMETHOD StyleChangeReflow();
virtual nsIFrame* GetRootFrame();
virtual nsIFrame* FindFrameWithContent(nsIContent* aContent);
virtual void AppendReflowCommand(nsIReflowCommand* aReflowCommand);
virtual void ProcessReflowCommands();
NS_IMETHOD CreateRenderingContext(nsIFrame *aFrame, nsIRenderingContext *&aContext);
//nsIViewObserver interface
NS_IMETHOD Paint(nsIView *aView,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect);
NS_IMETHOD HandleEvent(nsIView* aView,
nsGUIEvent* aEvent,
nsEventStatus& aEventStatus);
NS_IMETHOD Scrolled(nsIView *aView);
NS_IMETHOD ResizeReflow(nsIView *aView, nscoord aWidth, nscoord aHeight);
protected:
~PresShell();
#ifdef NS_DEBUG
void VerifyIncrementalReflow();
#endif
nsIDocument* mDocument;
nsIPresContext* mPresContext;
nsIStyleSet* mStyleSet;
nsIFrame* mRootFrame;
nsIViewManager* mViewManager;
PRUint32 mUpdateCount;
nsVoidArray mReflowCommands;
PRUint32 mReflowLockCount;
};
#ifdef NS_DEBUG
/**
* Note: the log module is created during library initialization which
* means that you cannot perform logging before then.
*/
static PRLogModuleInfo* gLogModule = PR_NewLogModule("verifyreflow");
#endif
static PRBool gVerifyReflow = PRBool(0x55);
NS_LAYOUT PRBool
nsIPresShell::GetVerifyReflowEnable()
{
#ifdef NS_DEBUG
if (gVerifyReflow == PRBool(0x55)) {
gVerifyReflow = 0 != gLogModule->level;
printf("Note: verifyreflow is %sabled\n",
gVerifyReflow ? "en" : "dis");
}
#endif
return gVerifyReflow;
}
NS_LAYOUT void
nsIPresShell::SetVerifyReflowEnable(PRBool aEnabled)
{
gVerifyReflow = aEnabled;
}
//----------------------------------------------------------------------
NS_LAYOUT nsresult
NS_NewPresShell(nsIPresShell** aInstancePtrResult)
{
NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
if (nsnull == aInstancePtrResult) {
return NS_ERROR_NULL_POINTER;
}
PresShell* it = new PresShell();
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(kIPresShellIID, (void **) aInstancePtrResult);
}
PresShell::PresShell()
{
}
#ifdef NS_DEBUG
// for debugging only
nsrefcnt PresShell::AddRef(void)
{
if (gsNoisyRefs) printf("PresShell: AddRef: %x, cnt = %d \n",this, mRefCnt+1);
return ++mRefCnt;
}
// for debugging only
nsrefcnt PresShell::Release(void)
{
if (gsNoisyRefs==PR_TRUE) printf("PresShell Release: %x, cnt = %d \n",this, mRefCnt-1);
if (--mRefCnt == 0) {
if (gsNoisyRefs==PR_TRUE) printf("PresShell Delete: %x, \n",this);
delete this;
return 0;
}
return mRefCnt;
}
#else
NS_IMPL_ADDREF(PresShell)
NS_IMPL_RELEASE(PresShell)
#endif
nsresult
PresShell::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
if (aIID.Equals(kIPresShellIID)) {
nsIPresShell* tmp = this;
*aInstancePtr = (void*) tmp;
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(kIDocumentObserverIID)) {
nsIDocumentObserver* tmp = this;
*aInstancePtr = (void*) tmp;
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(kIViewObserverIID)) {
nsIViewObserver* tmp = this;
*aInstancePtr = (void*) tmp;
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(kISupportsIID)) {
nsIPresShell* tmp = this;
nsISupports* tmp2 = tmp;
*aInstancePtr = (void*) tmp2;
NS_ADDREF_THIS();
return NS_OK;
}
return NS_NOINTERFACE;
}
PresShell::~PresShell()
{
mRefCnt = 99;/* XXX hack! get around re-entrancy bugs */
if (nsnull != mRootFrame) {
mRootFrame->DeleteFrame(*mPresContext);
}
NS_IF_RELEASE(mViewManager);
//Release mPresContext after mViewManager
NS_IF_RELEASE(mPresContext);
NS_IF_RELEASE(mStyleSet);
if (nsnull != mDocument) {
mDocument->DeleteShell(this);
NS_RELEASE(mDocument);
}
mRefCnt = 0;
}
/**
* Initialize the presentation shell. Create view manager and style
* manager.
*/
nsresult
PresShell::Init(nsIDocument* aDocument,
nsIPresContext* aPresContext,
nsIViewManager* aViewManager,
nsIStyleSet* aStyleSet)
{
NS_PRECONDITION(nsnull != aDocument, "null ptr");
NS_PRECONDITION(nsnull != aPresContext, "null ptr");
NS_PRECONDITION(nsnull != aViewManager, "null ptr");
if ((nsnull == aDocument) || (nsnull == aPresContext) ||
(nsnull == aViewManager)) {
return NS_ERROR_NULL_POINTER;
}
if (nsnull != mDocument) {
return NS_ERROR_ALREADY_INITIALIZED;
}
mDocument = aDocument;
NS_ADDREF(aDocument);
mViewManager = aViewManager;
NS_ADDREF(mViewManager);
//doesn't add a ref since we own it... MMP
mViewManager->SetViewObserver((nsIViewObserver *)this);
// Bind the context to the presentation shell.
mPresContext = aPresContext;
NS_ADDREF(aPresContext);
aPresContext->SetShell(this);
mStyleSet = aStyleSet;
NS_ADDREF(aStyleSet);
return NS_OK;
}
NS_METHOD
PresShell::EnterReflowLock()
{
++mReflowLockCount;
return NS_OK;
}
NS_METHOD
PresShell::ExitReflowLock()
{
PRUint32 newReflowLockCount = mReflowLockCount - 1;
if (newReflowLockCount == 0) {
ProcessReflowCommands();
}
mReflowLockCount = newReflowLockCount;
return NS_OK;
}
nsIDocument*
PresShell::GetDocument()
{
NS_IF_ADDREF(mDocument);
return mDocument;
}
nsIPresContext*
PresShell::GetPresContext()
{
NS_IF_ADDREF(mPresContext);
return mPresContext;
}
nsIViewManager*
PresShell::GetViewManager()
{
NS_IF_ADDREF(mViewManager);
return mViewManager;
}
nsIStyleSet*
PresShell::GetStyleSet()
{
NS_IF_ADDREF(mStyleSet);
return mStyleSet;
}
// Make shell be a document observer
void
PresShell::BeginObservingDocument()
{
if (nsnull != mDocument) {
mDocument->AddObserver(this);
}
}
// Make shell stop being a document observer
void
PresShell::EndObservingDocument()
{
if (nsnull != mDocument) {
mDocument->RemoveObserver(this);
}
}
NS_IMETHODIMP
PresShell::InitialReflow(nscoord aWidth, nscoord aHeight)
{
NS_PRECONDITION(nsnull == mRootFrame, "unexpected root frame");
EnterReflowLock();
if (nsnull != mPresContext) {
nsRect r(0, 0, aWidth, aHeight);
mPresContext->SetVisibleArea(r);
}
if (nsnull == mRootFrame) {
if (nsnull != mDocument) {
nsIContent* root = mDocument->GetRootContent();
if (nsnull != root) {
// Have style sheet processor construct a frame for the
// root content object
mStyleSet->ConstructFrame(mPresContext, root, nsnull, mRootFrame);
NS_RELEASE(root);
}
}
}
if (nsnull != mRootFrame) {
// Kick off a top-down reflow
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
("enter nsPresShell::InitialReflow: %d,%d", aWidth, aHeight));
#ifdef NS_DEBUG
if (nsIFrame::GetVerifyTreeEnable()) {
mRootFrame->VerifyTree();
}
#endif
nsRect bounds;
mPresContext->GetVisibleArea(bounds);
nsSize maxSize(bounds.width, bounds.height);
nsHTMLReflowMetrics desiredSize(nsnull);
nsReflowStatus status;
nsIHTMLReflow* htmlReflow;
nsIRenderingContext* rcx = nsnull;
CreateRenderingContext(mRootFrame, rcx);
nsHTMLReflowState reflowState(*mPresContext, mRootFrame,
eReflowReason_Initial, maxSize, rcx);
if (NS_OK == mRootFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow)) {
htmlReflow->Reflow(*mPresContext, desiredSize, reflowState, status);
mRootFrame->SizeTo(desiredSize.width, desiredSize.height);
#ifdef NS_DEBUG
if (nsIFrame::GetVerifyTreeEnable()) {
mRootFrame->VerifyTree();
}
#endif
}
NS_IF_RELEASE(rcx);
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS, ("exit nsPresShell::InitialReflow"));
}
ExitReflowLock();
return NS_OK; //XXX this needs to be real. MMP
}
NS_IMETHODIMP
PresShell::ResizeReflow(nscoord aWidth, nscoord aHeight)
{
EnterReflowLock();
if (nsnull != mPresContext) {
nsRect r(0, 0, aWidth, aHeight);
mPresContext->SetVisibleArea(r);
}
// If we don't have a root frame yet, that means we haven't had our initial
// reflow...
if (nsnull != mRootFrame) {
// Kick off a top-down reflow
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
("enter nsPresShell::ResizeReflow: %d,%d", aWidth, aHeight));
#ifdef NS_DEBUG
if (nsIFrame::GetVerifyTreeEnable()) {
mRootFrame->VerifyTree();
}
#endif
nsRect bounds;
mPresContext->GetVisibleArea(bounds);
nsSize maxSize(bounds.width, bounds.height);
nsHTMLReflowMetrics desiredSize(nsnull);
nsReflowStatus status;
nsIHTMLReflow* htmlReflow;
nsIRenderingContext* rcx = nsnull;
CreateRenderingContext(mRootFrame, rcx);
nsHTMLReflowState reflowState(*mPresContext, mRootFrame,
eReflowReason_Resize, maxSize, rcx);
if (NS_OK == mRootFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow)) {
htmlReflow->Reflow(*mPresContext, desiredSize, reflowState, status);
mRootFrame->SizeTo(desiredSize.width, desiredSize.height);
#ifdef NS_DEBUG
if (nsIFrame::GetVerifyTreeEnable()) {
mRootFrame->VerifyTree();
}
#endif
}
NS_IF_RELEASE(rcx);
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS, ("exit nsPresShell::ResizeReflow"));
// XXX if debugging then we should assert that the cache is empty
} else {
#ifdef NOISY
printf("PresShell::ResizeReflow: null root frame\n");
#endif
}
ExitReflowLock();
return NS_OK; //XXX this needs to be real. MMP
}
NS_IMETHODIMP
PresShell::StyleChangeReflow()
{
EnterReflowLock();
if (nsnull != mRootFrame) {
// Kick off a top-down reflow
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
("enter nsPresShell::StyleChangeReflow"));
#ifdef NS_DEBUG
if (nsIFrame::GetVerifyTreeEnable()) {
mRootFrame->VerifyTree();
}
#endif
nsRect bounds;
mPresContext->GetVisibleArea(bounds);
nsSize maxSize(bounds.width, bounds.height);
nsHTMLReflowMetrics desiredSize(nsnull);
nsReflowStatus status;
nsIHTMLReflow* htmlReflow;
nsIRenderingContext* rcx = nsnull;
CreateRenderingContext(mRootFrame, rcx);
// XXX We should be using eReflowReason_StyleChange
nsHTMLReflowState reflowState(*mPresContext, mRootFrame,
eReflowReason_Resize, maxSize, rcx);
if (NS_OK == mRootFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow)) {
htmlReflow->Reflow(*mPresContext, desiredSize, reflowState, status);
mRootFrame->SizeTo(desiredSize.width, desiredSize.height);
#ifdef NS_DEBUG
if (nsIFrame::GetVerifyTreeEnable()) {
mRootFrame->VerifyTree();
}
#endif
}
NS_IF_RELEASE(rcx);
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS, ("exit nsPresShell::StyleChangeReflow"));
}
ExitReflowLock();
return NS_OK; //XXX this needs to be real. MMP
}
nsIFrame*
PresShell::GetRootFrame()
{
return mRootFrame;
}
NS_IMETHODIMP
PresShell::BeginUpdate(nsIDocument *aDocument)
{
mUpdateCount++;
return NS_OK;
}
NS_IMETHODIMP
PresShell::EndUpdate(nsIDocument *aDocument)
{
NS_PRECONDITION(0 != mUpdateCount, "too many EndUpdate's");
if (--mUpdateCount == 0) {
// XXX do something here
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::BeginLoad(nsIDocument *aDocument)
{
return NS_OK;
}
NS_IMETHODIMP
PresShell::EndLoad(nsIDocument *aDocument)
{
return NS_OK;
}
NS_IMETHODIMP
PresShell::BeginReflow(nsIDocument *aDocument, nsIPresShell* aShell)
{
return NS_OK;
}
NS_IMETHODIMP
PresShell::EndReflow(nsIDocument *aDocument, nsIPresShell* aShell)
{
return NS_OK;
}
void
PresShell::AppendReflowCommand(nsIReflowCommand* aReflowCommand)
{
mReflowCommands.AppendElement(aReflowCommand);
NS_ADDREF(aReflowCommand);
}
void
PresShell::ProcessReflowCommands()
{
if (0 != mReflowCommands.Count()) {
nsHTMLReflowMetrics desiredSize(nsnull);
nsIRenderingContext* rcx;
CreateRenderingContext(mRootFrame, rcx);
while (0 != mReflowCommands.Count()) {
nsIReflowCommand* rc = (nsIReflowCommand*) mReflowCommands.ElementAt(0);
mReflowCommands.RemoveElementAt(0);
// Dispatch the reflow command
nsSize maxSize;
mRootFrame->GetSize(maxSize);
#ifdef NS_DEBUG
nsIReflowCommand::ReflowType type;
rc->GetType(type);
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
("PresShell::ProcessReflowCommands: begin reflow command type=%d",
type));
#endif
rc->Dispatch(*mPresContext, desiredSize, maxSize, *rcx);
NS_RELEASE(rc);
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
("PresShell::ProcessReflowCommands: end reflow command"));
}
// Place and size the root frame
mRootFrame->SizeTo(desiredSize.width, desiredSize.height);
#ifdef NS_DEBUG
if (nsIFrame::GetVerifyTreeEnable()) {
mRootFrame->VerifyTree();
}
if (GetVerifyReflowEnable()) {
VerifyIncrementalReflow();
}
#endif
NS_IF_RELEASE(rcx);
}
}
NS_IMETHODIMP PresShell :: CreateRenderingContext(nsIFrame *aFrame,
nsIRenderingContext *&aContext)
{
nsIWidget *widget = nsnull;
nsIView *view = nsnull;
nsPoint pt;
nsresult rv;
aFrame->GetView(view);
if (nsnull == view)
aFrame->GetOffsetFromView(pt, view);
while (nsnull != view)
{
view->GetWidget(widget);
if (nsnull != widget)
{
NS_RELEASE(widget);
break;
}
view->GetParent(view);
}
if (nsnull != view)
{
nsIDeviceContext *dx;
dx = mPresContext->GetDeviceContext();
rv = dx->CreateRenderingContext(view, aContext);
NS_RELEASE(dx);
}
else
{
rv = NS_ERROR_FAILURE;
aContext = nsnull;
}
return rv;
}
#ifdef NS_DEBUG
static char*
ContentTag(nsIContent* aContent, PRIntn aSlot)
{
static char buf0[100], buf1[100], buf2[100];
static char* bufs[] = { buf0, buf1, buf2 };
char* buf = bufs[aSlot];
nsIAtom* atom;
aContent->GetTag(atom);
if (nsnull != atom) {
nsAutoString tmp;
atom->ToString(tmp);
tmp.ToCString(buf, 100);
}
else {
buf[0] = 0;
}
return buf;
}
#endif
NS_IMETHODIMP
PresShell::ContentChanged(nsIDocument *aDocument,
nsIContent* aContent,
nsISupports* aSubContent)
{
NS_PRECONDITION(nsnull != mRootFrame, "null root frame");
EnterReflowLock();
nsresult rv = mStyleSet->ContentChanged(mPresContext, aContent, aSubContent);
ExitReflowLock();
return rv;
}
NS_IMETHODIMP
PresShell::AttributeChanged(nsIDocument *aDocument,
nsIContent* aContent,
nsIAtom* aAttribute,
PRInt32 aHint)
{
NS_PRECONDITION(nsnull != mRootFrame, "null root frame");
EnterReflowLock();
nsresult rv = mStyleSet->AttributeChanged(mPresContext, aContent, aAttribute, aHint);
ExitReflowLock();
return rv;
}
NS_IMETHODIMP
PresShell::ContentAppended(nsIDocument *aDocument,
nsIContent* aContainer,
PRInt32 aNewIndexInContainer)
{
EnterReflowLock();
nsresult rv = mStyleSet->ContentAppended(mPresContext, aContainer, aNewIndexInContainer);
ExitReflowLock();
return rv;
}
NS_IMETHODIMP
PresShell::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
PRInt32 aIndexInContainer)
{
EnterReflowLock();
nsresult rv = mStyleSet->ContentInserted(mPresContext, aContainer, aChild, aIndexInContainer);
ExitReflowLock();
return rv;
}
NS_IMETHODIMP
PresShell::ContentReplaced(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aOldChild,
nsIContent* aNewChild,
PRInt32 aIndexInContainer)
{
EnterReflowLock();
nsresult rv = mStyleSet->ContentReplaced(mPresContext, aContainer, aOldChild,
aNewChild, aIndexInContainer);
ExitReflowLock();
return rv;
}
NS_IMETHODIMP
PresShell::ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
PRInt32 aIndexInContainer)
{
EnterReflowLock();
nsresult rv = mStyleSet->ContentRemoved(mPresContext, aContainer,
aChild, aIndexInContainer);
ExitReflowLock();
return rv;
}
NS_IMETHODIMP
PresShell::StyleSheetAdded(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet)
{
return NS_OK;
}
NS_IMETHODIMP
PresShell::DocumentWillBeDestroyed(nsIDocument *aDocument)
{
return NS_OK;
}
static PRBool
IsZeroSizedFrame(nsIFrame *aFrame)
{
nsSize size;
aFrame->GetSize(size);
return ((0 == size.width) && (0 == size.height));
}
static nsIFrame*
FindFrameWithContent(nsIFrame* aFrame, nsIContent* aContent)
{
nsIContent* frameContent;
aFrame->GetContent(frameContent);
if (frameContent == aContent) {
// XXX Sleazy hack to check whether this is a placeholder frame.
// If it is, we skip it and go on to (hopefully) find the
// absolutely positioned frame.
const nsStylePosition* position;
aFrame->GetStyleData(eStyleStruct_Position, (nsStyleStruct*&)position);
if ((NS_STYLE_POSITION_ABSOLUTE != position->mPosition) ||
!IsZeroSizedFrame(aFrame)) {
NS_RELEASE(frameContent);
return aFrame;
}
}
NS_RELEASE(frameContent);
aFrame->FirstChild(nsnull, aFrame);
while (aFrame) {
nsIFrame* result = FindFrameWithContent(aFrame, aContent);
if (result) {
return result;
}
aFrame->GetNextSibling(aFrame);
}
return nsnull;
}
nsIFrame*
PresShell::FindFrameWithContent(nsIContent* aContent)
{
// For the time being do a brute force depth-first search of
// the frame tree
return ::FindFrameWithContent(mRootFrame, aContent);
}
//nsIViewObserver
NS_IMETHODIMP PresShell :: Paint(nsIView *aView,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect)
{
void* clientData;
nsIFrame* frame;
nsresult rv = NS_OK;
NS_ASSERTION(!(nsnull == aView), "null view");
aView->GetClientData(clientData);
frame = (nsIFrame *)clientData;
if (nsnull != frame) {
rv = frame->Paint(*mPresContext, aRenderingContext, aDirtyRect);
#ifdef NS_DEBUG
// Draw a border around the frame
if (nsIFrame::GetShowFrameBorders()) {
nsRect r;
frame->GetRect(r);
aRenderingContext.SetColor(NS_RGB(0,0,255));
aRenderingContext.DrawRect(0, 0, r.width, r.height);
}
#endif
}
return rv;
}
NS_IMETHODIMP PresShell :: HandleEvent(nsIView *aView,
nsGUIEvent* aEvent,
nsEventStatus& aEventStatus)
{
void* clientData;
nsIFrame* frame;
nsresult rv;
NS_ASSERTION(!(nsnull == aView), "null view");
aView->GetClientData(clientData);
frame = (nsIFrame *)clientData;
if (nsnull != frame)
rv = frame->HandleEvent(*mPresContext, aEvent, aEventStatus);
else
rv = NS_OK;
return rv;
}
NS_IMETHODIMP PresShell :: Scrolled(nsIView *aView)
{
void* clientData;
nsIFrame* frame;
nsresult rv;
NS_ASSERTION(!(nsnull == aView), "null view");
aView->GetClientData(clientData);
frame = (nsIFrame *)clientData;
if (nsnull != frame)
rv = frame->Scrolled(aView);
else
rv = NS_OK;
return rv;
}
NS_IMETHODIMP PresShell :: ResizeReflow(nsIView *aView, nscoord aWidth, nscoord aHeight)
{
return ResizeReflow(aWidth, aHeight);
}
#ifdef NS_DEBUG
#include "nsViewsCID.h"
#include "nsWidgetsCID.h"
#include "nsIScrollableView.h"
#include "nsIDeviceContext.h"
#include "nsIURL.h"
#include "nsICSSParser.h"
#include "nsIStyleSheet.h"
static NS_DEFINE_IID(kViewManagerCID, NS_VIEW_MANAGER_CID);
static NS_DEFINE_IID(kIViewManagerIID, NS_IVIEWMANAGER_IID);
static NS_DEFINE_IID(kScrollingViewCID, NS_SCROLLING_VIEW_CID);
static NS_DEFINE_IID(kIViewIID, NS_IVIEW_IID);
static NS_DEFINE_IID(kScrollViewIID, NS_ISCROLLABLEVIEW_IID);
static NS_DEFINE_IID(kWidgetCID, NS_CHILD_CID);
static void
ShowDiffs(nsIFrame* k1, nsIFrame* k2, const nsRect& r1, const nsRect& r2)
{
printf("verifyreflow: ");
k1->ListTag(stdout);
printf(" ");
stdout << r1;
printf(" != ");
k2->ListTag(stdout);
printf(" ");
stdout << r2;
printf("\n");
}
static void
CompareTrees(nsIFrame* aA, nsIFrame* aB)
{
nsIFrame* k1, *k2;
aA->FirstChild(nsnull, k1);
aB->FirstChild(nsnull, k2);
NS_ASSERTION(nsContainerFrame::LengthOf(k1) == nsContainerFrame::LengthOf(k2),
"child counts don't match");
nsRect r1, r2;
nsIView* v1, *v2;
nsIWidget* w1, *w2;
for (;;) {
if (nsnull == k1) {
NS_ASSERTION(nsnull == k2, "child lists are different");
break;
}
NS_ASSERTION(nsnull != k2, "child lists are different");
// Verify that the frames are the same size
k1->GetRect(r1);
k2->GetRect(r2);
if (r1 != r2) {
ShowDiffs(k1, k2, r1, r2);
}
else {
// Make sure either both have views or neither have views; if they
// do have views, make sure the views are the same size. If the
// views have widgets, make sure they both do or neither does. If
// they do, make sure the widgets are the same size.
k1->GetView(v1);
k2->GetView(v2);
if (nsnull != v1) {
NS_ASSERTION(nsnull != v2, "child views are not matched");
v1->GetBounds(r1);
v2->GetBounds(r2);
NS_ASSERTION(r1 == r2, "child views are different sizes");
v1->GetWidget(w1);
v2->GetWidget(w2);
if (nsnull != w1) {
NS_ASSERTION(nsnull != w2, "child widgets are not matched");
w1->GetBounds(r1);
w2->GetBounds(r2);
NS_ASSERTION(r1 == r2, "child widgets are different sizes");
}
else {
NS_ASSERTION(nsnull == w2, "child widgets are not matched");
}
}
else {
NS_ASSERTION(nsnull == v2, "child views are not matched");
}
// Compare the sub-trees too
CompareTrees(k1, k2);
}
// Advance to next sibling
k1->GetNextSibling(k1);
k2->GetNextSibling(k2);
}
}
// XXX: copy of nsWebWidget's ua.css loading code!!!
#define UA_CSS_URL "resource:/res/ua.css"
static nsIStyleSheet* gUAStyleSheet;
static nsresult
InitUAStyleSheet()
{
nsresult rv = NS_OK;
if (nsnull == gUAStyleSheet) { // snarf one
nsIURL* uaURL;
rv = NS_NewURL(&uaURL, nsnull, UA_CSS_URL); // XXX this bites, fix it
if (NS_OK == rv) {
// Get an input stream from the url
PRInt32 ec;
nsIInputStream* in = uaURL->Open(&ec);
if (nsnull != in) {
// Translate the input using the argument character set id into unicode
nsIUnicharInputStream* uin;
rv = NS_NewConverterStream(&uin, nsnull, in);
if (NS_OK == rv) {
// Create parser and set it up to process the input file
nsICSSParser* css;
rv = NS_NewCSSParser(&css);
if (NS_OK == rv) {
// Parse the input and produce a style set
// XXX note: we are ignoring rv until the error code stuff in the
// input routines is converted to use nsresult's
css->Parse(uin, uaURL, gUAStyleSheet);
NS_RELEASE(css);
}
NS_RELEASE(uin);
}
NS_RELEASE(in);
}
else {
// printf("open of %s failed: error=%x\n", UA_CSS_URL, ec);
rv = NS_ERROR_ILLEGAL_VALUE; // XXX need a better error code here
}
NS_RELEASE(uaURL);
}
}
return rv;
}
static nsresult
CreateStyleSet(nsIDocument* aDocument, nsIStyleSet** aStyleSet)
{
nsresult rv = InitUAStyleSheet();
if (NS_OK != rv) {
NS_WARNING("unable to load UA style sheet");
}
rv = NS_NewStyleSet(aStyleSet);
if (NS_OK == rv) {
PRInt32 index = aDocument->GetNumberOfStyleSheets();
while (0 < index--) {
// NOTE: turn the order around for the set
nsIStyleSheet* sheet = aDocument->GetStyleSheetAt(index);
(*aStyleSet)->AppendDocStyleSheet(sheet);
NS_RELEASE(sheet);
}
// XXX this is just wrong, the UA style sheet should be owned by the UA
// for that matter, the style set should be created by the UA too
if (nsnull != gUAStyleSheet) {
(*aStyleSet)->AppendBackstopStyleSheet(gUAStyleSheet);
}
}
return rv;
}
// After an incremental reflow, we verify the correctness by doing a
// full reflow into a fresh frame tree.
void
PresShell::VerifyIncrementalReflow()
{
// All the stuff we are creating that needs releasing
nsIPresContext* cx;
nsIViewManager* vm;
nsIView* view;
nsIPresShell* sh;
nsIStyleSet* ss;
// Create a presentation context to view the new frame tree
nsresult rv;
if (mPresContext->IsPaginated()) {
rv = NS_NewPrintPreviewContext(&cx);
}
else {
rv = NS_NewGalleyContext(&cx);
}
NS_ASSERTION(NS_OK == rv, "failed to create presentation context");
nsIDeviceContext* dc = mPresContext->GetDeviceContext();
nsIPref* prefs;
mPresContext->GetPrefs(prefs);
cx->Init(dc, prefs);
NS_IF_RELEASE(prefs);
rv = CreateStyleSet(mDocument, &ss);
NS_ASSERTION(NS_OK == rv, "failed to create style set");
// Get our scrolling preference
nsScrollPreference scrolling;
nsIView* rootView;
mViewManager->GetRootView(rootView);
nsIScrollableView* scrollView;
rv = rootView->QueryInterface(kScrollViewIID, (void**)&scrollView);
if (NS_OK == rv) {
scrollView->GetScrollPreference(scrolling);
}
nsIWidget* rootWidget;
rootView->GetWidget(rootWidget);
void* nativeParentWidget = rootWidget->GetNativeData(NS_NATIVE_WIDGET);
// Create a new view manager.
rv = nsRepository::CreateInstance(kViewManagerCID, nsnull, kIViewManagerIID,
(void**) &vm);
if ((NS_OK != rv) || (NS_OK != vm->Init(dc))) {
NS_ASSERTION(NS_OK == rv, "failed to create view manager");
}
NS_RELEASE(dc);
vm->SetViewObserver((nsIViewObserver *)this);
// Create a child window of the parent that is our "root view/window"
// Create a view
nsRect tbounds;
mPresContext->GetVisibleArea(tbounds);
// tbounds *= mPresContext->GetPixelsToTwips();
rv = nsRepository::CreateInstance(kScrollingViewCID, nsnull, kIViewIID,
(void **) &view);
if ((NS_OK != rv) || (NS_OK != view->Init(vm, tbounds, nsnull))) {
NS_ASSERTION(NS_OK == rv, "failed to create scroll view");
}
//now create the widget for the view
rv = view->CreateWidget(kWidgetCID, nsnull, nativeParentWidget);
if (NS_OK != rv) {
NS_ASSERTION(NS_OK == rv, "failed to create scroll view widget");
}
rv = view->QueryInterface(kScrollViewIID, (void**)&scrollView);
if (NS_OK == rv) {
scrollView->CreateScrollControls(nativeParentWidget);
scrollView->SetScrollPreference(scrolling);
}
else {
NS_ASSERTION(0, "invalid scrolling view");
}
// Setup hierarchical relationship in view manager
vm->SetRootView(view);
// Make the new presentation context the same size as our
// presentation context.
nsRect r;
mPresContext->GetVisibleArea(r);
cx->SetVisibleArea(r);
// Create a new presentation shell to view the document
rv = mDocument->CreateShell(cx, vm, ss, &sh);
NS_ASSERTION(NS_OK == rv, "failed to create presentation shell");
sh->ResizeReflow(r.width, r.height);
// Now that the document has been reflowed, use its frame tree to
// compare against our frame tree.
CompareTrees(GetRootFrame(), sh->GetRootFrame());
NS_RELEASE(vm);
NS_RELEASE(cx);
NS_RELEASE(sh);
NS_RELEASE(ss);
}
#endif
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