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gecko-dev/layout/style/nsStyleSet.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Daniel Glazman <glazman@netscape.com>
* Brian Ryner <bryner@brianryner.com>
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* the container for the style sheets that apply to a presentation, and
* the internal API that the style system exposes for creating (and
* potentially re-creating) style contexts
*/
#include "nsStyleSet.h"
#include "nsNetUtil.h"
#include "nsICSSStyleSheet.h"
#include "nsIDocument.h"
#include "nsRuleWalker.h"
#include "nsStyleContext.h"
#include "nsICSSStyleRule.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSRuleProcessor.h"
#include "nsIContent.h"
#include "nsIFrame.h"
#include "nsContentUtils.h"
NS_IMPL_ISUPPORTS1(nsEmptyStyleRule, nsIStyleRule)
NS_IMETHODIMP
nsEmptyStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
return NS_OK;
}
#ifdef DEBUG
NS_IMETHODIMP
nsEmptyStyleRule::List(FILE* out, PRInt32 aIndent) const
{
return NS_OK;
}
#endif
static const nsStyleSet::sheetType gCSSSheetTypes[] = {
nsStyleSet::eAgentSheet,
nsStyleSet::eUserSheet,
nsStyleSet::eDocSheet,
nsStyleSet::eOverrideSheet
};
nsStyleSet::nsStyleSet()
: mRuleTree(nsnull),
mRuleWalker(nsnull),
mDestroyedCount(0),
mBatching(0),
mInShutdown(PR_FALSE),
mAuthorStyleDisabled(PR_FALSE),
mInReconstruct(PR_FALSE),
mDirty(0)
{
}
nsresult
nsStyleSet::Init(nsPresContext *aPresContext)
{
mFirstLineRule = new nsEmptyStyleRule;
mFirstLetterRule = new nsEmptyStyleRule;
if (!mFirstLineRule || !mFirstLetterRule) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (!BuildDefaultStyleData(aPresContext)) {
mDefaultStyleData.Destroy(0, aPresContext);
return NS_ERROR_OUT_OF_MEMORY;
}
mRuleTree = nsRuleNode::CreateRootNode(aPresContext);
if (!mRuleTree) {
mDefaultStyleData.Destroy(0, aPresContext);
return NS_ERROR_OUT_OF_MEMORY;
}
mRuleWalker = new nsRuleWalker(mRuleTree);
if (!mRuleWalker) {
mRuleTree->Destroy();
mDefaultStyleData.Destroy(0, aPresContext);
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
nsresult
nsStyleSet::BeginReconstruct()
{
NS_ASSERTION(!mInReconstruct, "Unmatched begin/end?");
NS_ASSERTION(mRuleTree, "Reconstructing before first construction?");
// Create a new rule tree root
nsRuleNode* newTree =
nsRuleNode::CreateRootNode(mRuleTree->GetPresContext());
if (!newTree)
return NS_ERROR_OUT_OF_MEMORY;
nsRuleWalker* ruleWalker = new nsRuleWalker(newTree);
if (!ruleWalker) {
newTree->Destroy();
return NS_ERROR_OUT_OF_MEMORY;
}
// Save the old rule tree so we can destroy it later
if (!mOldRuleTrees.AppendElement(mRuleTree)) {
delete ruleWalker;
newTree->Destroy();
return NS_ERROR_OUT_OF_MEMORY;
}
// Delete mRuleWalker because it holds a reference to the rule tree root
delete mRuleWalker;
// We need to keep mRoots so that the rule tree GC will only free the
// rule trees that really aren't referenced anymore (which should be
// all of them, if there are no bugs in reresolution code).
mInReconstruct = PR_TRUE;
mRuleTree = newTree;
mRuleWalker = ruleWalker;
return NS_OK;
}
void
nsStyleSet::EndReconstruct()
{
NS_ASSERTION(mInReconstruct, "Unmatched begin/end?");
mInReconstruct = PR_FALSE;
#ifdef DEBUG
for (PRInt32 i = mRoots.Length() - 1; i >= 0; --i) {
nsRuleNode *n = mRoots[i]->GetRuleNode();
while (n->GetParent()) {
n = n->GetParent();
}
// Since nsStyleContext's mParent and mRuleNode are immutable, and
// style contexts own their parents, and nsStyleContext asserts in
// its constructor that the style context and its parent are in the
// same rule tree, we don't need to check any of the children of
// mRoots; we only need to check the rule nodes of mRoots
// themselves.
NS_ASSERTION(n == mRuleTree, "style context has old rule node");
}
#endif
// This *should* destroy the only element of mOldRuleTrees, but in
// case of some bugs (which would trigger the above assertions), it
// won't.
GCRuleTrees();
}
void
nsStyleSet::SetQuirkStyleSheet(nsIStyleSheet* aQuirkStyleSheet)
{
NS_ASSERTION(aQuirkStyleSheet, "Must have quirk sheet if this is called");
NS_ASSERTION(!mQuirkStyleSheet, "Multiple calls to SetQuirkStyleSheet?");
NS_ASSERTION(mSheets[eAgentSheet].IndexOf(aQuirkStyleSheet) != -1,
"Quirk style sheet not one of our agent sheets?");
mQuirkStyleSheet = aQuirkStyleSheet;
}
nsresult
nsStyleSet::GatherRuleProcessors(sheetType aType)
{
mRuleProcessors[aType] = nsnull;
if (mAuthorStyleDisabled && (aType == eDocSheet ||
aType == ePresHintSheet ||
aType == eHTMLPresHintSheet ||
aType == eStyleAttrSheet)) {
//don't regather if this level is disabled
return NS_OK;
}
if (mSheets[aType].Count()) {
switch (aType) {
case eAgentSheet:
case eUserSheet:
case eDocSheet:
case eOverrideSheet: {
// levels containing CSS stylesheets
nsCOMArray<nsIStyleSheet>& sheets = mSheets[aType];
nsCOMArray<nsICSSStyleSheet> cssSheets(sheets.Count());
for (PRInt32 i = 0, i_end = sheets.Count(); i < i_end; ++i) {
nsCOMPtr<nsICSSStyleSheet> cssSheet = do_QueryInterface(sheets[i]);
NS_ASSERTION(cssSheet, "not a CSS sheet");
cssSheets.AppendObject(cssSheet);
}
mRuleProcessors[aType] = new nsCSSRuleProcessor(cssSheets,
PRUint8(aType));
} break;
default:
// levels containing non-CSS stylesheets
NS_ASSERTION(mSheets[aType].Count() == 1, "only one sheet per level");
mRuleProcessors[aType] = do_QueryInterface(mSheets[aType][0]);
break;
}
}
return NS_OK;
}
#ifdef DEBUG
#define CHECK_APPLICABLE \
PR_BEGIN_MACRO \
PRBool applicable = PR_TRUE; \
aSheet->GetApplicable(applicable); \
NS_ASSERTION(applicable, "Inapplicable sheet being placed in style set"); \
PR_END_MACRO
#else
#define CHECK_APPLICABLE
#endif
nsresult
nsStyleSet::AppendStyleSheet(sheetType aType, nsIStyleSheet *aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
CHECK_APPLICABLE;
mSheets[aType].RemoveObject(aSheet);
if (!mSheets[aType].AppendObject(aSheet))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::PrependStyleSheet(sheetType aType, nsIStyleSheet *aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
CHECK_APPLICABLE;
mSheets[aType].RemoveObject(aSheet);
if (!mSheets[aType].InsertObjectAt(aSheet, 0))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::RemoveStyleSheet(sheetType aType, nsIStyleSheet *aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
#ifdef DEBUG
PRBool complete = PR_TRUE;
aSheet->GetComplete(complete);
NS_ASSERTION(complete, "Incomplete sheet being removed from style set");
#endif
mSheets[aType].RemoveObject(aSheet);
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::ReplaceSheets(sheetType aType,
const nsCOMArray<nsIStyleSheet> &aNewSheets)
{
mSheets[aType].Clear();
if (!mSheets[aType].AppendObjects(aNewSheets))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
PRBool
nsStyleSet::GetAuthorStyleDisabled()
{
return mAuthorStyleDisabled;
}
nsresult
nsStyleSet::SetAuthorStyleDisabled(PRBool aStyleDisabled)
{
if (aStyleDisabled == !mAuthorStyleDisabled) {
mAuthorStyleDisabled = aStyleDisabled;
BeginUpdate();
mDirty |= 1 << eDocSheet |
1 << ePresHintSheet |
1 << eHTMLPresHintSheet |
1 << eStyleAttrSheet;
return EndUpdate();
}
return NS_OK;
}
// -------- Doc Sheets
nsresult
nsStyleSet::AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument)
{
NS_PRECONDITION(aSheet && aDocument, "null arg");
CHECK_APPLICABLE;
nsCOMArray<nsIStyleSheet>& docSheets = mSheets[eDocSheet];
docSheets.RemoveObject(aSheet);
// lowest index first
PRInt32 newDocIndex = aDocument->GetIndexOfStyleSheet(aSheet);
PRInt32 count = docSheets.Count();
PRInt32 index;
for (index = 0; index < count; index++) {
nsIStyleSheet* sheet = docSheets.ObjectAt(index);
PRInt32 sheetDocIndex = aDocument->GetIndexOfStyleSheet(sheet);
if (sheetDocIndex > newDocIndex)
break;
}
if (!docSheets.InsertObjectAt(aSheet, index))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(eDocSheet);
mDirty |= 1 << eDocSheet;
return NS_OK;
}
#undef CHECK_APPLICABLE
// Batching
void
nsStyleSet::BeginUpdate()
{
++mBatching;
}
nsresult
nsStyleSet::EndUpdate()
{
NS_ASSERTION(mBatching > 0, "Unbalanced EndUpdate");
if (--mBatching) {
// We're not completely done yet.
return NS_OK;
}
for (int i = 0; i < eSheetTypeCount; ++i) {
if (mDirty & (1 << i)) {
nsresult rv = GatherRuleProcessors(sheetType(i));
NS_ENSURE_SUCCESS(rv, rv);
}
}
mDirty = 0;
return NS_OK;
}
void
nsStyleSet::EnableQuirkStyleSheet(PRBool aEnable)
{
#ifdef DEBUG
PRBool oldEnabled;
{
nsCOMPtr<nsIDOMCSSStyleSheet> domSheet =
do_QueryInterface(mQuirkStyleSheet);
domSheet->GetDisabled(&oldEnabled);
oldEnabled = !oldEnabled;
}
#endif
mQuirkStyleSheet->SetEnabled(aEnable);
#ifdef DEBUG
// This should always be OK, since SetEnabled should call
// ClearRuleCascades.
// Note that we can hit this codepath multiple times when document.open()
// (potentially implied) happens multiple times.
if (mRuleProcessors[eAgentSheet] && aEnable != oldEnabled) {
static_cast<nsCSSRuleProcessor*>(static_cast<nsIStyleRuleProcessor*>(
mRuleProcessors[eAgentSheet]))->AssertQuirksChangeOK();
}
#endif
}
static PRBool
EnumRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData)
{
ElementRuleProcessorData* data =
static_cast<ElementRuleProcessorData*>(aData);
aProcessor->RulesMatching(data);
return PR_TRUE;
}
/**
* |GetContext| implements sharing of style contexts (not just the data
* on the rule nodes) between siblings and cousins of the same
* generation. (It works for cousins of the same generation since
* |aParentContext| could itself be a shared context.)
*/
already_AddRefed<nsStyleContext>
nsStyleSet::GetContext(nsPresContext* aPresContext,
nsStyleContext* aParentContext,
nsIAtom* aPseudoTag)
{
nsStyleContext* result = nsnull;
nsRuleNode* ruleNode = mRuleWalker->GetCurrentNode();
if (aParentContext)
result = aParentContext->FindChildWithRules(aPseudoTag, ruleNode).get();
#ifdef NOISY_DEBUG
if (result)
fprintf(stdout, "--- SharedSC %d ---\n", ++gSharedCount);
else
fprintf(stdout, "+++ NewSC %d +++\n", ++gNewCount);
#endif
if (!result) {
result = NS_NewStyleContext(aParentContext, aPseudoTag, ruleNode,
aPresContext).get();
if (!aParentContext && result)
mRoots.AppendElement(result);
}
return result;
}
void
nsStyleSet::AddImportantRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode)
{
if (!aCurrLevelNode)
return;
nsAutoTArray<nsCOMPtr<nsIStyleRule>, 16> importantRules;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
nsIStyleRule *rule = node->GetRule();
nsCOMPtr<nsICSSStyleRule> cssRule(do_QueryInterface(rule));
if (cssRule) {
nsCOMPtr<nsIStyleRule> impRule = cssRule->GetImportantRule();
if (impRule)
importantRules.AppendElement(impRule);
}
}
for (PRUint32 i = importantRules.Length(); i-- != 0; ) {
mRuleWalker->Forward(importantRules[i]);
}
}
#ifdef DEBUG
void
nsStyleSet::AssertNoImportantRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode)
{
if (!aCurrLevelNode)
return;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
nsIStyleRule *rule = node->GetRule();
nsCOMPtr<nsICSSStyleRule> cssRule(do_QueryInterface(rule));
if (cssRule) {
nsCOMPtr<nsIStyleRule> impRule = cssRule->GetImportantRule();
NS_ASSERTION(!impRule, "Unexpected important rule");
}
}
}
void
nsStyleSet::AssertNoCSSRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode)
{
if (!aCurrLevelNode)
return;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
nsIStyleRule *rule = node->GetRule();
nsCOMPtr<nsICSSStyleRule> cssRule(do_QueryInterface(rule));
NS_ASSERTION(!cssRule || !cssRule->Selector(), "Unexpected CSS rule");
}
}
#endif
// Enumerate the rules in a way that cares about the order of the rules.
void
nsStyleSet::FileRules(nsIStyleRuleProcessor::EnumFunc aCollectorFunc,
RuleProcessorData* aData)
{
// Cascading order:
// [least important]
// 1. UA normal rules = Agent normal
// 2. Presentation hints = PresHint normal
// 3. User normal rules = User normal
// 4. HTML Presentation hints = HTMLPresHint normal
// 5. Author normal rules = Document normal
// 6. Override normal rules = Override normal
// 7. Author !important rules = Document !important
// 8. Override !important rules = Override !important
// 9. User !important rules = User !important
// 10. UA !important rules = Agent !important
// [most important]
NS_PRECONDITION(SheetCount(ePresHintSheet) == 0 ||
SheetCount(eHTMLPresHintSheet) == 0,
"Can't have both types of preshint sheets at once!");
mRuleWalker->SetLevel(eAgentSheet, PR_FALSE);
if (mRuleProcessors[eAgentSheet])
(*aCollectorFunc)(mRuleProcessors[eAgentSheet], aData);
nsRuleNode* lastAgentRN = mRuleWalker->GetCurrentNode();
mRuleWalker->SetLevel(ePresHintSheet, PR_FALSE);
if (mRuleProcessors[ePresHintSheet])
(*aCollectorFunc)(mRuleProcessors[ePresHintSheet], aData);
nsRuleNode* lastPresHintRN = mRuleWalker->GetCurrentNode();
mRuleWalker->SetLevel(eUserSheet, PR_FALSE);
PRBool skipUserStyles =
aData->mContent && aData->mContent->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different
(*aCollectorFunc)(mRuleProcessors[eUserSheet], aData);
nsRuleNode* lastUserRN = mRuleWalker->GetCurrentNode();
mRuleWalker->SetLevel(eHTMLPresHintSheet, PR_FALSE);
if (mRuleProcessors[eHTMLPresHintSheet])
(*aCollectorFunc)(mRuleProcessors[eHTMLPresHintSheet], aData);
nsRuleNode* lastHTMLPresHintRN = mRuleWalker->GetCurrentNode();
mRuleWalker->SetLevel(eDocSheet, PR_FALSE);
PRBool cutOffInheritance = PR_FALSE;
if (mBindingManager) {
// We can supply additional document-level sheets that should be walked.
mBindingManager->WalkRules(aCollectorFunc, aData, &cutOffInheritance);
}
if (!skipUserStyles && !cutOffInheritance &&
mRuleProcessors[eDocSheet]) // NOTE: different
(*aCollectorFunc)(mRuleProcessors[eDocSheet], aData);
mRuleWalker->SetLevel(eStyleAttrSheet, PR_FALSE);
if (mRuleProcessors[eStyleAttrSheet])
(*aCollectorFunc)(mRuleProcessors[eStyleAttrSheet], aData);
nsRuleNode* lastDocRN = mRuleWalker->GetCurrentNode();
mRuleWalker->SetLevel(eOverrideSheet, PR_FALSE);
if (mRuleProcessors[eOverrideSheet])
(*aCollectorFunc)(mRuleProcessors[eOverrideSheet], aData);
nsRuleNode* lastOvrRN = mRuleWalker->GetCurrentNode();
mRuleWalker->SetLevel(eDocSheet, PR_TRUE);
AddImportantRules(lastDocRN, lastHTMLPresHintRN); // doc
mRuleWalker->SetLevel(eOverrideSheet, PR_TRUE);
AddImportantRules(lastOvrRN, lastDocRN); // override
#ifdef DEBUG
AssertNoCSSRules(lastHTMLPresHintRN, lastUserRN);
AssertNoImportantRules(lastHTMLPresHintRN, lastUserRN); // HTML preshints
#endif
mRuleWalker->SetLevel(eUserSheet, PR_TRUE);
AddImportantRules(lastUserRN, lastPresHintRN); //user
#ifdef DEBUG
AssertNoCSSRules(lastPresHintRN, lastAgentRN);
AssertNoImportantRules(lastPresHintRN, lastAgentRN); // preshints
#endif
mRuleWalker->SetLevel(eAgentSheet, PR_TRUE);
AddImportantRules(lastAgentRN, nsnull); //agent
}
// Enumerate all the rules in a way that doesn't care about the order
// of the rules and doesn't walk !important-rules.
void
nsStyleSet::WalkRuleProcessors(nsIStyleRuleProcessor::EnumFunc aFunc,
RuleProcessorData* aData)
{
NS_PRECONDITION(SheetCount(ePresHintSheet) == 0 ||
SheetCount(eHTMLPresHintSheet) == 0,
"Can't have both types of preshint sheets at once!");
if (mRuleProcessors[eAgentSheet])
(*aFunc)(mRuleProcessors[eAgentSheet], aData);
if (mRuleProcessors[ePresHintSheet])
(*aFunc)(mRuleProcessors[ePresHintSheet], aData);
PRBool skipUserStyles =
aData->mContent && aData->mContent->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different
(*aFunc)(mRuleProcessors[eUserSheet], aData);
if (mRuleProcessors[eHTMLPresHintSheet])
(*aFunc)(mRuleProcessors[eHTMLPresHintSheet], aData);
PRBool cutOffInheritance = PR_FALSE;
if (mBindingManager) {
// We can supply additional document-level sheets that should be walked.
mBindingManager->WalkRules(aFunc, aData, &cutOffInheritance);
}
if (!skipUserStyles && !cutOffInheritance &&
mRuleProcessors[eDocSheet]) // NOTE: different
(*aFunc)(mRuleProcessors[eDocSheet], aData);
if (mRuleProcessors[eStyleAttrSheet])
(*aFunc)(mRuleProcessors[eStyleAttrSheet], aData);
if (mRuleProcessors[eOverrideSheet])
(*aFunc)(mRuleProcessors[eOverrideSheet], aData);
}
PRBool nsStyleSet::BuildDefaultStyleData(nsPresContext* aPresContext)
{
NS_ASSERTION(!mDefaultStyleData.mResetData &&
!mDefaultStyleData.mInheritedData,
"leaking default style data");
mDefaultStyleData.mResetData = new (aPresContext) nsResetStyleData;
if (!mDefaultStyleData.mResetData)
return PR_FALSE;
mDefaultStyleData.mInheritedData = new (aPresContext) nsInheritedStyleData;
if (!mDefaultStyleData.mInheritedData)
return PR_FALSE;
#define SSARG_PRESCONTEXT aPresContext
#define CREATE_DATA(name, type, args) \
if (!(mDefaultStyleData.m##type##Data->m##name##Data = \
new (aPresContext) nsStyle##name args)) \
return PR_FALSE;
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \
CREATE_DATA(name, Inherited, ctor_args)
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \
CREATE_DATA(name, Reset, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_INHERITED
#undef STYLE_STRUCT_RESET
#undef SSARG_PRESCONTEXT
return PR_TRUE;
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleFor(nsIContent* aContent,
nsStyleContext* aParentContext)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
nsStyleContext* result = nsnull;
nsPresContext* presContext = PresContext();
NS_ASSERTION(aContent, "must have content");
NS_ASSERTION(aContent->IsNodeOfType(nsINode::eELEMENT),
"content must be element");
if (aContent && presContext) {
ElementRuleProcessorData data(presContext, aContent, mRuleWalker);
FileRules(EnumRulesMatching, &data);
result = GetContext(presContext, aParentContext, nsnull).get();
// Now reset the walker back to the root of the tree.
mRuleWalker->Reset();
}
return result;
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleForRules(nsStyleContext* aParentContext, const nsCOMArray<nsIStyleRule> &rules)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
nsStyleContext* result = nsnull;
nsPresContext *presContext = PresContext();
if (presContext) {
mRuleWalker->SetLevel(eDocSheet, PR_FALSE);
for (PRInt32 i = 0; i < rules.Count(); i++) {
mRuleWalker->Forward(rules.ObjectAt(i));
}
result = GetContext(presContext, aParentContext, nsnull).get();
// Now reset the walker back to the root of the tree.
mRuleWalker->Reset();
}
return result;
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleForNonElement(nsStyleContext* aParentContext)
{
nsStyleContext* result = nsnull;
nsPresContext *presContext = PresContext();
if (presContext) {
result = GetContext(presContext, aParentContext,
nsCSSAnonBoxes::mozNonElement).get();
NS_ASSERTION(mRuleWalker->AtRoot(), "rule walker must be at root");
}
return result;
}
void
nsStyleSet::WalkRestrictionRule(nsIAtom* aPseudoType)
{
// This needs to match GetPseudoRestriction in nsRuleNode.cpp.
if (aPseudoType) {
if (aPseudoType == nsCSSPseudoElements::firstLetter)
mRuleWalker->Forward(mFirstLetterRule);
else if (aPseudoType == nsCSSPseudoElements::firstLine)
mRuleWalker->Forward(mFirstLineRule);
}
}
static PRBool
EnumPseudoRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData)
{
PseudoRuleProcessorData* data =
static_cast<PseudoRuleProcessorData*>(aData);
aProcessor->RulesMatching(data);
return PR_TRUE;
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolvePseudoStyleFor(nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsStyleContext* aParentContext,
nsICSSPseudoComparator* aComparator)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
nsStyleContext* result = nsnull;
nsPresContext *presContext = PresContext();
NS_ASSERTION(aPseudoTag, "must have pseudo tag");
NS_ASSERTION(!aParentContent ||
aParentContent->IsNodeOfType(nsINode::eELEMENT),
"content (if non-null) must be element");
NS_ASSERTION(aParentContent ||
nsCSSAnonBoxes::IsAnonBox(aPseudoTag),
"null content must correspond to anonymous box");
NS_ASSERTION(nsCSSAnonBoxes::IsAnonBox(aPseudoTag) ||
nsCSSPseudoElements::IsPseudoElement(aPseudoTag),
"aPseudoTag must be pseudo-element or anonymous box");
if (aPseudoTag && presContext) {
PseudoRuleProcessorData data(presContext, aParentContent, aPseudoTag,
aComparator, mRuleWalker);
WalkRestrictionRule(aPseudoTag);
FileRules(EnumPseudoRulesMatching, &data);
result = GetContext(presContext, aParentContext, aPseudoTag).get();
// Now reset the walker back to the root of the tree.
mRuleWalker->Reset();
}
return result;
}
already_AddRefed<nsStyleContext>
nsStyleSet::ProbePseudoStyleFor(nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsStyleContext* aParentContext)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
nsStyleContext* result = nsnull;
nsPresContext *presContext = PresContext();
NS_ASSERTION(aPseudoTag, "must have pseudo tag");
NS_ASSERTION(aParentContent &&
aParentContent->IsNodeOfType(nsINode::eELEMENT),
"aParentContent must be element");
//NS_ASSERTION(nsCSSPseudoElements::IsPseudoElement(aPseudoTag),
// "aPseudoTag must be a pseudo-element");
NS_ASSERTION(aParentContent ||
nsCSSAnonBoxes::IsAnonBox(aPseudoTag),
"null content must correspond to anonymous box");
NS_ASSERTION(nsCSSAnonBoxes::IsAnonBox(aPseudoTag) ||
nsCSSPseudoElements::IsPseudoElement(aPseudoTag),
"aPseudoTag must be pseudo-element or anonymous box");
if (aPseudoTag && presContext) {
PseudoRuleProcessorData data(presContext, aParentContent, aPseudoTag,
nsnull, mRuleWalker);
WalkRestrictionRule(aPseudoTag);
// not the root if there was a restriction rule
nsRuleNode *adjustedRoot = mRuleWalker->GetCurrentNode();
FileRules(EnumPseudoRulesMatching, &data);
if (mRuleWalker->GetCurrentNode() != adjustedRoot)
result = GetContext(presContext, aParentContext, aPseudoTag).get();
// Now reset the walker back to the root of the tree.
mRuleWalker->Reset();
}
// For :before and :after pseudo-elements, having display: none or no
// 'content' property is equivalent to not having the pseudo-element
// at all.
if (result &&
(aPseudoTag == nsCSSPseudoElements::before ||
aPseudoTag == nsCSSPseudoElements::after)) {
const nsStyleDisplay *display = result->GetStyleDisplay();
const nsStyleContent *content = result->GetStyleContent();
// XXXldb What is contentCount for |content: ""|?
if (display->mDisplay == NS_STYLE_DISPLAY_NONE ||
content->ContentCount() == 0) {
result->Release();
result = nsnull;
}
}
return result;
}
PRBool
nsStyleSet::AppendFontFaceRules(nsPresContext* aPresContext,
nsTArray<nsFontFaceRuleContainer>& aArray)
{
NS_ENSURE_FALSE(mInShutdown, PR_FALSE);
for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(gCSSSheetTypes); ++i) {
nsCSSRuleProcessor *ruleProc = static_cast<nsCSSRuleProcessor*>
(mRuleProcessors[gCSSSheetTypes[i]].get());
if (ruleProc && !ruleProc->AppendFontFaceRules(aPresContext, aArray))
return PR_FALSE;
}
return PR_TRUE;
}
void
nsStyleSet::BeginShutdown(nsPresContext* aPresContext)
{
mInShutdown = 1;
mRoots.Clear(); // no longer valid, since we won't keep it up to date
}
void
nsStyleSet::Shutdown(nsPresContext* aPresContext)
{
delete mRuleWalker;
mRuleWalker = nsnull;
mRuleTree->Destroy();
mRuleTree = nsnull;
// We can have old rule trees either because:
// (1) we failed the assertions in EndReconstruct, or
// (2) we're shutting down within a reconstruct (see bug 462392)
for (PRUint32 i = mOldRuleTrees.Length(); i > 0; ) {
--i;
mOldRuleTrees[i]->Destroy();
}
mOldRuleTrees.Clear();
mDefaultStyleData.Destroy(0, aPresContext);
}
static const PRInt32 kGCInterval = 1000;
void
nsStyleSet::NotifyStyleContextDestroyed(nsPresContext* aPresContext,
nsStyleContext* aStyleContext)
{
if (mInShutdown)
return;
NS_ASSERTION(mRuleWalker->AtRoot(), "Rule walker should be at root");
// Remove style contexts from mRoots even if mOldRuleTree is non-null. This
// could be a style context from the new ruletree!
if (!aStyleContext->GetParent()) {
mRoots.RemoveElement(aStyleContext);
}
if (mInReconstruct)
return;
if (++mDestroyedCount == kGCInterval) {
GCRuleTrees();
}
}
void
nsStyleSet::GCRuleTrees()
{
mDestroyedCount = 0;
// Mark the style context tree by marking all style contexts which
// have no parent, which will mark all descendants. This will reach
// style contexts in the undisplayed map and "additional style
// contexts" since they are descendants of the roots.
for (PRInt32 i = mRoots.Length() - 1; i >= 0; --i) {
mRoots[i]->Mark();
}
// Sweep the rule tree.
#ifdef DEBUG
PRBool deleted =
#endif
mRuleTree->Sweep();
NS_ASSERTION(!deleted, "Root node must not be gc'd");
// Sweep the old rule trees.
for (PRUint32 i = mOldRuleTrees.Length(); i > 0; ) {
--i;
if (mOldRuleTrees[i]->Sweep()) {
// It was deleted, as it should be.
mOldRuleTrees.RemoveElementAt(i);
} else {
NS_NOTREACHED("old rule tree still referenced");
}
}
}
already_AddRefed<nsStyleContext>
nsStyleSet::ReParentStyleContext(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
nsStyleContext* aNewParentContext)
{
NS_ASSERTION(aPresContext, "must have pres context");
NS_ASSERTION(aStyleContext, "must have style context");
if (aPresContext && aStyleContext) {
if (aStyleContext->GetParent() == aNewParentContext) {
aStyleContext->AddRef();
return aStyleContext;
}
else { // really a new parent
nsIAtom* pseudoTag = aStyleContext->GetPseudoType();
nsRuleNode* ruleNode = aStyleContext->GetRuleNode();
mRuleWalker->SetCurrentNode(ruleNode);
already_AddRefed<nsStyleContext> result =
GetContext(aPresContext, aNewParentContext, pseudoTag);
mRuleWalker->Reset();
return result;
}
}
return nsnull;
}
struct StatefulData : public StateRuleProcessorData {
StatefulData(nsPresContext* aPresContext,
nsIContent* aContent, PRInt32 aStateMask)
: StateRuleProcessorData(aPresContext, aContent, aStateMask),
mHint(nsReStyleHint(0))
{}
nsReStyleHint mHint;
};
static PRBool SheetHasStatefulStyle(nsIStyleRuleProcessor* aProcessor,
void *aData)
{
StatefulData* data = (StatefulData*)aData;
nsReStyleHint hint;
aProcessor->HasStateDependentStyle(data, &hint);
data->mHint = nsReStyleHint(data->mHint | hint);
return PR_TRUE; // continue
}
// Test if style is dependent on content state
nsReStyleHint
nsStyleSet::HasStateDependentStyle(nsPresContext* aPresContext,
nsIContent* aContent,
PRInt32 aStateMask)
{
nsReStyleHint result = nsReStyleHint(0);
if (aContent->IsNodeOfType(nsINode::eELEMENT)) {
StatefulData data(aPresContext, aContent, aStateMask);
WalkRuleProcessors(SheetHasStatefulStyle, &data);
result = data.mHint;
}
return result;
}
struct AttributeData : public AttributeRuleProcessorData {
AttributeData(nsPresContext* aPresContext,
nsIContent* aContent, nsIAtom* aAttribute, PRInt32 aModType,
PRUint32 aStateMask)
: AttributeRuleProcessorData(aPresContext, aContent, aAttribute, aModType,
aStateMask),
mHint(nsReStyleHint(0))
{}
nsReStyleHint mHint;
};
static PRBool
SheetHasAttributeStyle(nsIStyleRuleProcessor* aProcessor, void *aData)
{
AttributeData* data = (AttributeData*)aData;
nsReStyleHint hint;
aProcessor->HasAttributeDependentStyle(data, &hint);
data->mHint = nsReStyleHint(data->mHint | hint);
return PR_TRUE; // continue
}
// Test if style is dependent on content state
nsReStyleHint
nsStyleSet::HasAttributeDependentStyle(nsPresContext* aPresContext,
nsIContent* aContent,
nsIAtom* aAttribute,
PRInt32 aModType,
PRUint32 aStateMask)
{
nsReStyleHint result = nsReStyleHint(0);
if (aContent->IsNodeOfType(nsINode::eELEMENT)) {
AttributeData data(aPresContext, aContent, aAttribute, aModType,
aStateMask);
WalkRuleProcessors(SheetHasAttributeStyle, &data);
result = data.mHint;
}
return result;
}
PRBool
nsStyleSet::MediumFeaturesChanged(nsPresContext* aPresContext)
{
// We can't use WalkRuleProcessors without a content node.
PRBool stylesChanged = PR_FALSE;
for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(mRuleProcessors); ++i) {
nsIStyleRuleProcessor *processor = mRuleProcessors[i];
if (!processor) {
continue;
}
PRBool thisChanged = PR_FALSE;
processor->MediumFeaturesChanged(aPresContext, &thisChanged);
stylesChanged = stylesChanged || thisChanged;
}
if (mBindingManager) {
PRBool thisChanged = PR_FALSE;
mBindingManager->MediumFeaturesChanged(aPresContext, &thisChanged);
stylesChanged = stylesChanged || thisChanged;
}
return stylesChanged;
}
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