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RetroZilla/layout/style/nsStyleSet.cpp
Ryan Nematz 2f2ae146c0 first commit
2015-10-20 23:03:22 -04:00

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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>
*
* 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 ***** */
#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"
nsIURI *nsStyleSet::gQuirkURI = 0;
nsStyleSet::nsStyleSet()
: mRuleTree(nsnull),
mRuleWalker(nsnull),
mDestroyedCount(0),
mBatching(0),
mInShutdown(PR_FALSE),
mAuthorStyleDisabled(PR_FALSE),
mDirty(0)
{
}
nsresult
nsStyleSet::Init(nsPresContext *aPresContext)
{
if (!gQuirkURI) {
static const char kQuirk_href[] = "resource://gre/res/quirk.css";
NS_NewURI(&gQuirkURI, kQuirk_href);
NS_ENSURE_TRUE(gQuirkURI, 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::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);
} 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)
{
if (!mQuirkStyleSheet) {
// first find the quirk sheet:
// - run through all of the agent sheets and check for a CSSStyleSheet that
// has the URL we want
PRInt32 nSheets = mSheets[eAgentSheet].Count();
for (PRInt32 i = 0; i < nSheets; ++i) {
nsIStyleSheet *sheet = mSheets[eAgentSheet].ObjectAt(i);
NS_ASSERTION(sheet, "mAgentSheets should not contain null sheets");
nsICSSStyleSheet *cssSheet = NS_STATIC_CAST(nsICSSStyleSheet*, sheet);
NS_ASSERTION(nsCOMPtr<nsICSSStyleSheet>(do_QueryInterface(sheet)) == cssSheet,
"Agent sheet must be a CSSStyleSheet");
nsCOMPtr<nsIStyleSheet> quirkSheet;
PRBool bHasSheet = PR_FALSE;
if (NS_SUCCEEDED(cssSheet->ContainsStyleSheet(gQuirkURI, bHasSheet,
getter_AddRefs(quirkSheet)))
&& bHasSheet) {
NS_ASSERTION(quirkSheet, "QuirkSheet must be set: ContainsStyleSheet is hosed");
// cache the sheet for faster lookup next time
mQuirkStyleSheet = quirkSheet;
// only one quirk style sheet can exist, so stop looking
break;
}
}
}
NS_ASSERTION(mQuirkStyleSheet, "no quirk stylesheet");
if (mQuirkStyleSheet) {
#ifdef DEBUG_dbaron_off // XXX Make this |DEBUG| once it stops firing.
PRBool applicableNow;
mQuirkStyleSheet->GetApplicable(applicableNow);
NS_ASSERTION(!mRuleProcessors[eAgentSheet] || aEnable == applicableNow,
"enabling/disabling quirk stylesheet too late or incomplete quirk stylesheet");
if (mRuleProcessors[eAgentSheet] && aEnable == applicableNow)
printf("WARNING: We set the quirks mode too many times.\n"); // we do!
#endif
mQuirkStyleSheet->SetEnabled(aEnable);
}
}
static PRBool
EnumRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData)
{
ElementRuleProcessorData* data =
NS_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 || aCurrLevelNode == aLastPrevLevelNode)
return;
AddImportantRules(aCurrLevelNode->GetParent(), aLastPrevLevelNode);
nsIStyleRule *rule = aCurrLevelNode->GetRule();
nsCOMPtr<nsICSSStyleRule> cssRule(do_QueryInterface(rule));
if (cssRule) {
nsCOMPtr<nsIStyleRule> impRule = cssRule->GetImportantRule();
if (impRule)
mRuleWalker->Forward(impRule);
}
}
#ifdef DEBUG
void
nsStyleSet::AssertNoImportantRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode)
{
if (!aCurrLevelNode || aCurrLevelNode == aLastPrevLevelNode)
return;
AssertNoImportantRules(aCurrLevelNode->GetParent(), aLastPrevLevelNode);
nsIStyleRule *rule = aCurrLevelNode->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 || aCurrLevelNode == aLastPrevLevelNode)
return;
AssertNoImportantRules(aCurrLevelNode->GetParent(), aLastPrevLevelNode);
nsIStyleRule *rule = aCurrLevelNode->GetRule();
nsCOMPtr<nsICSSStyleRule> cssRule(do_QueryInterface(rule));
NS_ASSERTION(!cssRule, "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
// 2. 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!");
if (mRuleProcessors[eAgentSheet])
(*aCollectorFunc)(mRuleProcessors[eAgentSheet], aData);
nsRuleNode* lastAgentRN = mRuleWalker->GetCurrentNode();
if (mRuleProcessors[ePresHintSheet])
(*aCollectorFunc)(mRuleProcessors[ePresHintSheet], aData);
nsRuleNode* lastPresHintRN = mRuleWalker->GetCurrentNode();
if (mRuleProcessors[eUserSheet])
(*aCollectorFunc)(mRuleProcessors[eUserSheet], aData);
nsRuleNode* lastUserRN = mRuleWalker->GetCurrentNode();
if (mRuleProcessors[eHTMLPresHintSheet])
(*aCollectorFunc)(mRuleProcessors[eHTMLPresHintSheet], aData);
nsRuleNode* lastHTMLPresHintRN = mRuleWalker->GetCurrentNode();
PRBool cutOffInheritance = PR_FALSE;
if (mStyleRuleSupplier) {
// We can supply additional document-level sheets that should be walked.
mStyleRuleSupplier->WalkRules(this, aCollectorFunc, aData,
&cutOffInheritance);
}
if (!cutOffInheritance && mRuleProcessors[eDocSheet]) // NOTE: different
(*aCollectorFunc)(mRuleProcessors[eDocSheet], aData);
if (mRuleProcessors[eStyleAttrSheet])
(*aCollectorFunc)(mRuleProcessors[eStyleAttrSheet], aData);
if (mRuleProcessors[eOverrideSheet])
(*aCollectorFunc)(mRuleProcessors[eOverrideSheet], aData);
nsRuleNode* lastOvrRN = mRuleWalker->GetCurrentNode();
// There should be no important rules in the preshint or HTMLpreshint level
AddImportantRules(lastOvrRN, lastHTMLPresHintRN); // doc and override
#ifdef DEBUG
AssertNoCSSRules(lastHTMLPresHintRN, lastUserRN);
AssertNoImportantRules(lastHTMLPresHintRN, lastUserRN); // HTML preshints
#endif
AddImportantRules(lastUserRN, lastPresHintRN); //user
#ifdef DEBUG
AssertNoImportantRules(lastPresHintRN, lastAgentRN); // preshints
#endif
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);
if (mRuleProcessors[eUserSheet])
(*aFunc)(mRuleProcessors[eUserSheet], aData);
if (mRuleProcessors[eHTMLPresHintSheet])
(*aFunc)(mRuleProcessors[eHTMLPresHintSheet], aData);
PRBool cutOffInheritance = PR_FALSE;
if (mStyleRuleSupplier) {
// We can supply additional document-level sheets that should be walked.
mStyleRuleSupplier->WalkRules(this, aFunc, aData, &cutOffInheritance);
}
if (!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->IsContentOfType(nsIContent::eELEMENT),
"content must be element");
if (aContent && presContext) {
if (mRuleProcessors[eAgentSheet] ||
mRuleProcessors[ePresHintSheet] ||
mRuleProcessors[eUserSheet] ||
mRuleProcessors[eHTMLPresHintSheet] ||
mRuleProcessors[eDocSheet] ||
mRuleProcessors[eStyleAttrSheet] ||
mRuleProcessors[eOverrideSheet]) {
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::ResolveStyleForNonElement(nsStyleContext* aParentContext)
{
nsStyleContext* result = nsnull;
nsPresContext *presContext = PresContext();
if (presContext) {
if (mRuleProcessors[eAgentSheet] ||
mRuleProcessors[ePresHintSheet] ||
mRuleProcessors[eUserSheet] ||
mRuleProcessors[eHTMLPresHintSheet] ||
mRuleProcessors[eDocSheet] ||
mRuleProcessors[eStyleAttrSheet] ||
mRuleProcessors[eOverrideSheet]) {
result = GetContext(presContext, aParentContext,
nsCSSAnonBoxes::mozNonElement).get();
NS_ASSERTION(mRuleWalker->AtRoot(), "rule walker must be at root");
}
}
return result;
}
static PRBool
EnumPseudoRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData)
{
PseudoRuleProcessorData* data =
NS_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->IsContentOfType(nsIContent::eELEMENT),
"content (if non-null) must be element");
if (aPseudoTag && presContext) {
if (mRuleProcessors[eAgentSheet] ||
mRuleProcessors[ePresHintSheet] ||
mRuleProcessors[eUserSheet] ||
mRuleProcessors[eHTMLPresHintSheet] ||
mRuleProcessors[eDocSheet] ||
mRuleProcessors[eStyleAttrSheet] ||
mRuleProcessors[eOverrideSheet]) {
PseudoRuleProcessorData data(presContext, aParentContent, aPseudoTag,
aComparator, mRuleWalker);
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->IsContentOfType(nsIContent::eELEMENT),
"content (if non-null) must be element");
if (aPseudoTag && presContext) {
if (mRuleProcessors[eAgentSheet] ||
mRuleProcessors[ePresHintSheet] ||
mRuleProcessors[eUserSheet] ||
mRuleProcessors[eHTMLPresHintSheet] ||
mRuleProcessors[eDocSheet] ||
mRuleProcessors[eStyleAttrSheet] ||
mRuleProcessors[eOverrideSheet]) {
PseudoRuleProcessorData data(presContext, aParentContent, aPseudoTag,
nsnull, mRuleWalker);
FileRules(EnumPseudoRulesMatching, &data);
if (!mRuleWalker->AtRoot())
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;
}
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;
mDefaultStyleData.Destroy(0, aPresContext);
}
static const PRInt32 kGCInterval = 1000;
void
nsStyleSet::NotifyStyleContextDestroyed(nsPresContext* aPresContext,
nsStyleContext* aStyleContext)
{
if (mInShutdown)
return;
if (!aStyleContext->GetParent()) {
mRoots.RemoveElement(aStyleContext);
}
if (++mDestroyedCount == kGCInterval) {
mDestroyedCount = 0;
// Mark the style context tree by marking all roots, which will mark
// all descendants. This will reach style contexts in the
// undisplayed map and "additional style contexts" since they are
// descendants of the root.
for (PRInt32 i = mRoots.Count() - 1; i >= 0; --i) {
NS_STATIC_CAST(nsStyleContext*,mRoots[i])->Mark();
}
// Sweep the rule tree.
NS_ASSERTION(mRuleWalker->AtRoot(), "Rule walker should be at root");
#ifdef DEBUG
PRBool deleted =
#endif
mRuleTree->Sweep();
NS_ASSERTION(!deleted, "Root node must not be gc'd");
}
}
void
nsStyleSet::ClearStyleData(nsPresContext* aPresContext)
{
mRuleTree->ClearStyleData();
for (PRInt32 i = mRoots.Count() - 1; i >= 0; --i) {
NS_STATIC_CAST(nsStyleContext*,mRoots[i])->ClearStyleData(aPresContext);
}
}
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->IsContentOfType(nsIContent::eELEMENT) &&
(mRuleProcessors[eAgentSheet] ||
mRuleProcessors[ePresHintSheet] ||
mRuleProcessors[eUserSheet] ||
mRuleProcessors[eHTMLPresHintSheet] ||
mRuleProcessors[eDocSheet] ||
mRuleProcessors[eStyleAttrSheet] ||
mRuleProcessors[eOverrideSheet])) {
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)
: AttributeRuleProcessorData(aPresContext, aContent, aAttribute, aModType),
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)
{
nsReStyleHint result = nsReStyleHint(0);
if (aContent->IsContentOfType(nsIContent::eELEMENT) &&
(mRuleProcessors[eAgentSheet] ||
mRuleProcessors[ePresHintSheet] ||
mRuleProcessors[eUserSheet] ||
mRuleProcessors[eHTMLPresHintSheet] ||
mRuleProcessors[eDocSheet] ||
mRuleProcessors[eStyleAttrSheet] ||
mRuleProcessors[eOverrideSheet])) {
AttributeData data(aPresContext, aContent, aAttribute, aModType);
WalkRuleProcessors(SheetHasAttributeStyle, &data);
result = data.mHint;
}
return result;
}
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