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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 -*-
* vim:cindent:ts=2:et:sw=2:
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* 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.
*/
/* storage of the frame tree and information about it */
#include "nscore.h"
#include "nsIPresShell.h"
#include "nsStyleContext.h"
#include "nsCOMPtr.h"
#include "plhash.h"
#include "nsPlaceholderFrame.h"
#include "nsGkAtoms.h"
#include "nsILayoutHistoryState.h"
#include "nsPresState.h"
#include "mozilla/dom/Element.h"
#include "nsIDocument.h"
#include "nsContentUtils.h"
#include "nsError.h"
#include "nsAutoPtr.h"
#include "nsAbsoluteContainingBlock.h"
#include "ChildIterator.h"
#include "nsFrameManager.h"
#include "GeckoProfiler.h"
#include "nsIStatefulFrame.h"
#include "nsContainerFrame.h"
// #define DEBUG_UNDISPLAYED_MAP
// #define DEBUG_DISPLAY_CONTENTS_MAP
using namespace mozilla;
using namespace mozilla::dom;
//----------------------------------------------------------------------
nsFrameManagerBase::nsFrameManagerBase()
: mPresShell(nullptr)
, mRootFrame(nullptr)
, mUndisplayedMap(nullptr)
, mDisplayContentsMap(nullptr)
, mIsDestroyingFrames(false)
{
}
//----------------------------------------------------------------------
/**
* The undisplayed map is a class that maps a parent content node to the
* undisplayed content children, and their style contexts.
*
* The linked list of nodes holds strong references to the style contexts and
* the content.
*/
class nsFrameManagerBase::UndisplayedMap :
private nsClassHashtable<nsPtrHashKey<nsIContent>,
LinkedList<UndisplayedNode>>
{
typedef nsClassHashtable<nsPtrHashKey<nsIContent>, LinkedList<UndisplayedNode>> base_type;
public:
UndisplayedMap();
~UndisplayedMap();
UndisplayedNode* GetFirstNode(nsIContent* aParentContent);
void AddNodeFor(nsIContent* aParentContent,
nsIContent* aChild,
nsStyleContext* aStyle);
void RemoveNodeFor(nsIContent* aParentContent, UndisplayedNode* aNode);
void RemoveNodesFor(nsIContent* aParentContent);
nsAutoPtr<LinkedList<UndisplayedNode>>
UnlinkNodesFor(nsIContent* aParentContent);
// Removes all entries from the hash table
void Clear();
protected:
LinkedList<UndisplayedNode>* GetListFor(nsIContent* aParentContent);
LinkedList<UndisplayedNode>* GetOrCreateListFor(nsIContent* aParentContent);
void AppendNodeFor(UndisplayedNode* aNode, nsIContent* aParentContent);
/**
* Get the applicable parent for the map lookup. This is almost always the
* provided argument, except if it's a <xbl:children> element, in which case
* it's the parent of the children element.
*/
nsIContent* GetApplicableParent(nsIContent* aParent);
};
//----------------------------------------------------------------------
nsFrameManager::~nsFrameManager()
{
NS_ASSERTION(!mPresShell, "nsFrameManager::Destroy never called");
}
void
nsFrameManager::Destroy()
{
NS_ASSERTION(mPresShell, "Frame manager already shut down.");
// Destroy the frame hierarchy.
mPresShell->SetIgnoreFrameDestruction(true);
if (mRootFrame) {
mRootFrame->Destroy();
mRootFrame = nullptr;
}
delete mUndisplayedMap;
mUndisplayedMap = nullptr;
delete mDisplayContentsMap;
mDisplayContentsMap = nullptr;
mPresShell = nullptr;
}
//----------------------------------------------------------------------
static nsIContent*
ParentForUndisplayedMap(const nsIContent* aContent)
{
MOZ_ASSERT(aContent);
nsIContent* parent = aContent->GetParentElementCrossingShadowRoot();
MOZ_ASSERT(parent || !aContent->GetParent(), "no non-elements");
return parent;
}
/* static */ nsStyleContext*
nsFrameManager::GetStyleContextInMap(UndisplayedMap* aMap,
const nsIContent* aContent)
{
UndisplayedNode* node = GetUndisplayedNodeInMapFor(aMap, aContent);
return node ? node->mStyle.get() : nullptr;
}
/* static */ UndisplayedNode*
nsFrameManager::GetUndisplayedNodeInMapFor(UndisplayedMap* aMap,
const nsIContent* aContent)
{
if (!aContent) {
return nullptr;
}
nsIContent* parent = ParentForUndisplayedMap(aContent);
for (UndisplayedNode* node = aMap->GetFirstNode(parent);
node; node = node->getNext()) {
if (node->mContent == aContent)
return node;
}
return nullptr;
}
/* static */ UndisplayedNode*
nsFrameManager::GetAllUndisplayedNodesInMapFor(UndisplayedMap* aMap,
nsIContent* aParentContent)
{
return aMap ? aMap->GetFirstNode(aParentContent) : nullptr;
}
UndisplayedNode*
nsFrameManager::GetAllUndisplayedContentIn(nsIContent* aParentContent)
{
return GetAllUndisplayedNodesInMapFor(mUndisplayedMap, aParentContent);
}
/* static */ void
nsFrameManager::SetStyleContextInMap(UndisplayedMap* aMap,
nsIContent* aContent,
nsStyleContext* aStyleContext)
{
MOZ_ASSERT(!aStyleContext->GetPseudo(),
"Should only have actual elements here");
#if defined(DEBUG_UNDISPLAYED_MAP) || defined(DEBUG_DISPLAY_BOX_CONTENTS_MAP)
static int i = 0;
printf("SetStyleContextInMap(%d): p=%p \n", i++, (void *)aContent);
#endif
MOZ_ASSERT(!GetStyleContextInMap(aMap, aContent),
"Already have an entry for aContent");
nsIContent* parent = ParentForUndisplayedMap(aContent);
#ifdef DEBUG
nsIPresShell* shell = aStyleContext->PresContext()->PresShell();
NS_ASSERTION(parent || (shell && shell->GetDocument() &&
shell->GetDocument()->GetRootElement() == aContent),
"undisplayed content must have a parent, unless it's the root "
"element");
#endif
aMap->AddNodeFor(parent, aContent, aStyleContext);
}
void
nsFrameManager::SetUndisplayedContent(nsIContent* aContent,
nsStyleContext* aStyleContext)
{
if (!mUndisplayedMap) {
mUndisplayedMap = new UndisplayedMap;
}
SetStyleContextInMap(mUndisplayedMap, aContent, aStyleContext);
}
/* static */ void
nsFrameManager::ChangeStyleContextInMap(UndisplayedMap* aMap,
nsIContent* aContent,
nsStyleContext* aStyleContext)
{
MOZ_ASSERT(aMap, "expecting a map");
#if defined(DEBUG_UNDISPLAYED_MAP) || defined(DEBUG_DISPLAY_BOX_CONTENTS_MAP)
static int i = 0;
printf("ChangeStyleContextInMap(%d): p=%p \n", i++, (void *)aContent);
#endif
for (UndisplayedNode* node = aMap->GetFirstNode(aContent->GetParent());
node; node = node->getNext()) {
if (node->mContent == aContent) {
node->mStyle = aStyleContext;
return;
}
}
MOZ_CRASH("couldn't find the entry to change");
}
void
nsFrameManager::ClearUndisplayedContentIn(nsIContent* aContent,
nsIContent* aParentContent)
{
#ifdef DEBUG_UNDISPLAYED_MAP
static int i = 0;
printf("ClearUndisplayedContent(%d): content=%p parent=%p --> ", i++, (void *)aContent, (void*)aParentContent);
#endif
if (!mUndisplayedMap) {
return;
}
for (UndisplayedNode* node = mUndisplayedMap->GetFirstNode(aParentContent);
node; node = node->getNext()) {
if (node->mContent == aContent) {
mUndisplayedMap->RemoveNodeFor(aParentContent, node);
#ifdef DEBUG_UNDISPLAYED_MAP
printf( "REMOVED!\n");
#endif
// make sure that there are no more entries for the same content
MOZ_ASSERT(!GetUndisplayedContent(aContent),
"Found more undisplayed content data after removal");
return;
}
}
#ifdef DEBUG_UNDISPLAYED_MAP
printf( "not found.\n");
#endif
}
void
nsFrameManager::ClearAllMapsFor(nsIContent* aParentContent)
{
#if defined(DEBUG_UNDISPLAYED_MAP) || defined(DEBUG_DISPLAY_CONTENTS_MAP)
static int i = 0;
printf("ClearAllMapsFor(%d): parent=%p \n", i++, aParentContent);
#endif
if (mUndisplayedMap) {
mUndisplayedMap->RemoveNodesFor(aParentContent);
}
if (mDisplayContentsMap) {
nsAutoPtr<LinkedList<UndisplayedNode>> list =
mDisplayContentsMap->UnlinkNodesFor(aParentContent);
if (list) {
while (UndisplayedNode* node = list->popFirst()) {
ClearAllMapsFor(node->mContent);
delete node;
}
}
}
// Need to look at aParentContent's content list due to XBL insertions.
// Nodes in aParentContent's content list do not have aParentContent as a
// parent, but are treated as children of aParentContent. We iterate over
// the flattened content list and just ignore any nodes we don't care about.
FlattenedChildIterator iter(aParentContent);
for (nsIContent* child = iter.GetNextChild(); child; child = iter.GetNextChild()) {
auto parent = child->GetParent();
if (parent != aParentContent) {
ClearUndisplayedContentIn(child, parent);
ClearDisplayContentsIn(child, parent);
}
}
}
//----------------------------------------------------------------------
void
nsFrameManager::SetDisplayContents(nsIContent* aContent,
nsStyleContext* aStyleContext)
{
if (!mDisplayContentsMap) {
mDisplayContentsMap = new UndisplayedMap;
}
SetStyleContextInMap(mDisplayContentsMap, aContent, aStyleContext);
}
UndisplayedNode*
nsFrameManager::GetAllDisplayContentsIn(nsIContent* aParentContent)
{
return GetAllUndisplayedNodesInMapFor(mDisplayContentsMap, aParentContent);
}
void
nsFrameManager::ClearDisplayContentsIn(nsIContent* aContent,
nsIContent* aParentContent)
{
#ifdef DEBUG_DISPLAY_CONTENTS_MAP
static int i = 0;
printf("ClearDisplayContents(%d): content=%p parent=%p --> ", i++, (void *)aContent, (void*)aParentContent);
#endif
if (!mDisplayContentsMap) {
return;
}
for (UndisplayedNode* node = mDisplayContentsMap->GetFirstNode(aParentContent);
node; node = node->getNext()) {
if (node->mContent == aContent) {
mDisplayContentsMap->RemoveNodeFor(aParentContent, node);
#ifdef DEBUG_DISPLAY_CONTENTS_MAP
printf( "REMOVED!\n");
#endif
// make sure that there are no more entries for the same content
MOZ_ASSERT(!GetDisplayContentsStyleFor(aContent),
"Found more entries for aContent after removal");
ClearAllMapsFor(aContent);
return;
}
}
#ifdef DEBUG_DISPLAY_CONTENTS_MAP
printf( "not found.\n");
#endif
}
//----------------------------------------------------------------------
void
nsFrameManager::AppendFrames(nsContainerFrame* aParentFrame,
ChildListID aListID,
nsFrameList& aFrameList)
{
if (aParentFrame->IsAbsoluteContainer() &&
aListID == aParentFrame->GetAbsoluteListID()) {
aParentFrame->GetAbsoluteContainingBlock()->
AppendFrames(aParentFrame, aListID, aFrameList);
} else {
aParentFrame->AppendFrames(aListID, aFrameList);
}
}
void
nsFrameManager::InsertFrames(nsContainerFrame* aParentFrame,
ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
NS_PRECONDITION(!aPrevFrame || (!aPrevFrame->GetNextContinuation()
|| (((aPrevFrame->GetNextContinuation()->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER))
&& !(aPrevFrame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER))),
"aPrevFrame must be the last continuation in its chain!");
if (aParentFrame->IsAbsoluteContainer() &&
aListID == aParentFrame->GetAbsoluteListID()) {
aParentFrame->GetAbsoluteContainingBlock()->
InsertFrames(aParentFrame, aListID, aPrevFrame, aFrameList);
} else {
aParentFrame->InsertFrames(aListID, aPrevFrame, aFrameList);
}
}
void
nsFrameManager::RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame)
{
bool wasDestroyingFrames = mIsDestroyingFrames;
mIsDestroyingFrames = true;
// In case the reflow doesn't invalidate anything since it just leaves
// a gap where the old frame was, we invalidate it here. (This is
// reasonably likely to happen when removing a last child in a way
// that doesn't change the size of the parent.)
// This has to sure to invalidate the entire overflow rect; this
// is important in the presence of absolute positioning
aOldFrame->InvalidateFrameForRemoval();
NS_ASSERTION(!aOldFrame->GetPrevContinuation() ||
// exception for nsCSSFrameConstructor::RemoveFloatingFirstLetterFrames
aOldFrame->IsTextFrame(),
"Must remove first continuation.");
NS_ASSERTION(!(aOldFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW &&
aOldFrame->GetPlaceholderFrame()),
"Must call RemoveFrame on placeholder for out-of-flows.");
nsContainerFrame* parentFrame = aOldFrame->GetParent();
if (parentFrame->IsAbsoluteContainer() &&
aListID == parentFrame->GetAbsoluteListID()) {
parentFrame->GetAbsoluteContainingBlock()->
RemoveFrame(parentFrame, aListID, aOldFrame);
} else {
parentFrame->RemoveFrame(aListID, aOldFrame);
}
mIsDestroyingFrames = wasDestroyingFrames;
}
//----------------------------------------------------------------------
void
nsFrameManager::NotifyDestroyingFrame(nsIFrame* aFrame)
{
nsIContent* content = aFrame->GetContent();
if (content && content->GetPrimaryFrame() == aFrame) {
ClearAllMapsFor(content);
}
}
// Capture state for a given frame.
// Accept a content id here, in some cases we may not have content (scroll position)
void
nsFrameManager::CaptureFrameStateFor(nsIFrame* aFrame,
nsILayoutHistoryState* aState)
{
if (!aFrame || !aState) {
NS_WARNING("null frame, or state");
return;
}
// Only capture state for stateful frames
nsIStatefulFrame* statefulFrame = do_QueryFrame(aFrame);
if (!statefulFrame) {
return;
}
// Capture the state, exit early if we get null (nothing to save)
nsAutoPtr<nsPresState> frameState;
nsresult rv = statefulFrame->SaveState(getter_Transfers(frameState));
if (!frameState) {
return;
}
// Generate the hash key to store the state under
// Exit early if we get empty key
nsAutoCString stateKey;
nsIContent* content = aFrame->GetContent();
nsIDocument* doc = content ? content->GetUncomposedDoc() : nullptr;
rv = statefulFrame->GenerateStateKey(content, doc, stateKey);
if(NS_FAILED(rv) || stateKey.IsEmpty()) {
return;
}
// Store the state. aState owns frameState now.
aState->AddState(stateKey, frameState.forget());
}
void
nsFrameManager::CaptureFrameState(nsIFrame* aFrame,
nsILayoutHistoryState* aState)
{
NS_PRECONDITION(nullptr != aFrame && nullptr != aState, "null parameters passed in");
CaptureFrameStateFor(aFrame, aState);
// Now capture state recursively for the frame hierarchy rooted at aFrame
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
if (child->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
// We'll pick it up when we get to its placeholder
continue;
}
// Make sure to walk through placeholders as needed, so that we
// save state for out-of-flows which may not be our descendants
// themselves but whose placeholders are our descendants.
CaptureFrameState(nsPlaceholderFrame::GetRealFrameFor(child), aState);
}
}
}
// Restore state for a given frame.
// Accept a content id here, in some cases we may not have content (scroll position)
void
nsFrameManager::RestoreFrameStateFor(nsIFrame* aFrame,
nsILayoutHistoryState* aState)
{
if (!aFrame || !aState) {
NS_WARNING("null frame or state");
return;
}
// Only restore state for stateful frames
nsIStatefulFrame* statefulFrame = do_QueryFrame(aFrame);
if (!statefulFrame) {
return;
}
// Generate the hash key the state was stored under
// Exit early if we get empty key
nsIContent* content = aFrame->GetContent();
// 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;
}
nsAutoCString stateKey;
nsIDocument* doc = content->GetUncomposedDoc();
nsresult rv = statefulFrame->GenerateStateKey(content, doc, stateKey);
if (NS_FAILED(rv) || stateKey.IsEmpty()) {
return;
}
// Get the state from the hash
nsPresState* frameState = aState->GetState(stateKey);
if (!frameState) {
return;
}
// Restore it
rv = statefulFrame->RestoreState(frameState);
if (NS_FAILED(rv)) {
return;
}
// If we restore ok, remove the state from the state table
aState->RemoveState(stateKey);
}
void
nsFrameManager::RestoreFrameState(nsIFrame* aFrame,
nsILayoutHistoryState* aState)
{
NS_PRECONDITION(nullptr != aFrame && nullptr != aState, "null parameters passed in");
RestoreFrameStateFor(aFrame, aState);
// Now restore state recursively for the frame hierarchy rooted at aFrame
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
RestoreFrameState(childFrames.get(), aState);
}
}
}
//----------------------------------------------------------------------
nsFrameManagerBase::UndisplayedMap::UndisplayedMap()
{
MOZ_COUNT_CTOR(nsFrameManagerBase::UndisplayedMap);
}
nsFrameManagerBase::UndisplayedMap::~UndisplayedMap(void)
{
MOZ_COUNT_DTOR(nsFrameManagerBase::UndisplayedMap);
Clear();
}
void
nsFrameManagerBase::UndisplayedMap::Clear()
{
for (auto iter = Iter(); !iter.Done(); iter.Next()) {
auto* list = iter.UserData();
while (auto* node = list->popFirst()) {
delete node;
}
iter.Remove();
}
}
nsIContent*
nsFrameManagerBase::UndisplayedMap::GetApplicableParent(nsIContent* aParent)
{
// In the case of XBL default content, <xbl:children> elements do not get a
// frame causing a mismatch between the content tree and the frame tree.
// |GetEntryFor| is sometimes called with the content tree parent (which may
// be a <xbl:children> element) but the parent in the frame tree would be the
// insertion parent (parent of the <xbl:children> element). Here the children
// elements are normalized to the insertion parent to correct for the mismatch.
if (aParent && nsContentUtils::IsContentInsertionPoint(aParent)) {
return aParent->GetParent();
}
return aParent;
}
LinkedList<UndisplayedNode>*
nsFrameManagerBase::UndisplayedMap::GetListFor(nsIContent* aParent)
{
aParent = GetApplicableParent(aParent);
LinkedList<UndisplayedNode>* list;
if (Get(aParent, &list)) {
return list;
}
return nullptr;
}
LinkedList<UndisplayedNode>*
nsFrameManagerBase::UndisplayedMap::GetOrCreateListFor(nsIContent* aParent)
{
aParent = GetApplicableParent(aParent);
return LookupOrAdd(aParent);
}
UndisplayedNode*
nsFrameManagerBase::UndisplayedMap::GetFirstNode(nsIContent* aParentContent)
{
auto* list = GetListFor(aParentContent);
return list ? list->getFirst() : nullptr;
}
void
nsFrameManagerBase::UndisplayedMap::AppendNodeFor(UndisplayedNode* aNode,
nsIContent* aParentContent)
{
LinkedList<UndisplayedNode>* list = GetOrCreateListFor(aParentContent);
#ifdef DEBUG
for (UndisplayedNode* node = list->getFirst(); node; node = node->getNext()) {
// NOTE: In the original code there was a work around for this case, I want
// to check it still happens before hacking around it the same way.
MOZ_ASSERT(node->mContent != aNode->mContent,
"Duplicated content in undisplayed list!");
}
#endif
list->insertBack(aNode);
}
void
nsFrameManagerBase::UndisplayedMap::AddNodeFor(nsIContent* aParentContent,
nsIContent* aChild,
nsStyleContext* aStyle)
{
UndisplayedNode* node = new UndisplayedNode(aChild, aStyle);
AppendNodeFor(node, aParentContent);
}
void
nsFrameManagerBase::UndisplayedMap::RemoveNodeFor(nsIContent* aParentContent,
UndisplayedNode* aNode)
{
#ifdef DEBUG
auto list = GetListFor(aParentContent);
MOZ_ASSERT(list, "content not in map");
aNode->removeFrom(*list);
#else
aNode->remove();
#endif
delete aNode;
}
nsAutoPtr<LinkedList<UndisplayedNode>>
nsFrameManagerBase::UndisplayedMap::UnlinkNodesFor(nsIContent* aParentContent)
{
nsAutoPtr<LinkedList<UndisplayedNode>> list;
RemoveAndForget(GetApplicableParent(aParentContent), list);
return list;
}
void
nsFrameManagerBase::UndisplayedMap::RemoveNodesFor(nsIContent* aParentContent)
{
nsAutoPtr<LinkedList<UndisplayedNode>> list = UnlinkNodesFor(aParentContent);
if (list) {
while (auto* node = list->popFirst()) {
delete node;
}
}
}
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