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gecko/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 "nsCSSStyleSheet.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"
#include "nsRuleProcessorData.h"
#include "nsTransitionManager.h"
#include "nsIEventStateManager.h"
#include "mozilla/dom/Element.h"
using namespace mozilla::dom;
NS_IMPL_ISUPPORTS1(nsEmptyStyleRule, nsIStyleRule)
/* virtual */ void
nsEmptyStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
}
#ifdef DEBUG
/* virtual */ void
nsEmptyStyleRule::List(FILE* out, PRInt32 aIndent) const
{
}
#endif
static const nsStyleSet::sheetType gCSSSheetTypes[] = {
nsStyleSet::eAgentSheet,
nsStyleSet::eUserSheet,
nsStyleSet::eDocSheet,
nsStyleSet::eOverrideSheet
};
nsStyleSet::nsStyleSet()
: mRuleTree(nsnull),
mUnusedRuleNodeCount(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;
}
GatherRuleProcessors(eTransitionSheet);
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;
// Save the old rule tree so we can destroy it later
if (!mOldRuleTrees.AppendElement(mRuleTree)) {
newTree->Destroy();
return NS_ERROR_OUT_OF_MEMORY;
}
// 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;
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 (aType == eTransitionSheet) {
// We have no sheet for the transitions level; just a rule
// processor. (XXX: We should probably do this for the other
// non-CSS levels too!)
mRuleProcessors[aType] = PresContext()->TransitionManager();
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];
nsTArray<nsRefPtr<nsCSSStyleSheet> > cssSheets(sheets.Count());
for (PRInt32 i = 0, i_end = sheets.Count(); i < i_end; ++i) {
nsRefPtr<nsCSSStyleSheet> cssSheet = do_QueryObject(sheets[i]);
NS_ASSERTION(cssSheet, "not a CSS sheet");
cssSheets.AppendElement(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;
}
nsresult
nsStyleSet::AppendStyleSheet(sheetType aType, nsIStyleSheet *aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
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");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
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");
NS_ASSERTION(aSheet->IsComplete(),
"Incomplete sheet being removed from style set");
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");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
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;
}
// 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
}
template<class T>
static PRBool
EnumRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData)
{
T* data = static_cast<T*>(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(nsStyleContext* aParentContext,
nsRuleNode* aRuleNode,
// aVisitedRuleNode may be null; if it is null
// it means that we don't need to force creation
// of a StyleIfVisited. (But if we make one
// because aParentContext has one, then aRuleNode
// should be used.)
nsRuleNode* aVisitedRuleNode,
// NB: ReparentStyleContext and
// ResolveStyleByAddingRules pass bogus values
// that work based on what this function is known
// to do with aIsLink and aIsVisitedLink
PRBool aIsLink,
PRBool aIsVisitedLink,
nsIAtom* aPseudoTag,
nsCSSPseudoElements::Type aPseudoType)
{
NS_PRECONDITION((!aPseudoTag &&
aPseudoType ==
nsCSSPseudoElements::ePseudo_NotPseudoElement) ||
(aPseudoTag &&
nsCSSPseudoElements::GetPseudoType(aPseudoTag) ==
aPseudoType),
"Pseudo mismatch");
// Ensure |aVisitedRuleNode != nsnull| corresponds to the need to
// create an if-visited style context, and that in that case, we have
// parentIfVisited set correctly.
nsStyleContext *parentIfVisited =
aParentContext ? aParentContext->GetStyleIfVisited() : nsnull;
if (parentIfVisited) {
if (!aVisitedRuleNode) {
aVisitedRuleNode = aRuleNode;
}
} else {
if (aVisitedRuleNode) {
parentIfVisited = aParentContext;
}
}
if (aIsLink) {
// If this node is a link, we want its visited's style context's
// parent to be the regular style context of its parent, because
// only the visitedness of the relevant link should influence style.
parentIfVisited = aParentContext;
}
nsRefPtr<nsStyleContext> result;
if (aParentContext)
result = aParentContext->FindChildWithRules(aPseudoTag, aRuleNode,
aVisitedRuleNode,
aIsVisitedLink);
#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, aPseudoType,
aRuleNode, PresContext());
if (!result)
return nsnull;
if (aVisitedRuleNode) {
nsRefPtr<nsStyleContext> resultIfVisited =
NS_NewStyleContext(parentIfVisited, aPseudoTag, aPseudoType,
aVisitedRuleNode, PresContext());
if (!resultIfVisited) {
return nsnull;
}
if (!parentIfVisited) {
mRoots.AppendElement(resultIfVisited);
}
resultIfVisited->SetIsStyleIfVisited();
result->SetStyleIfVisited(resultIfVisited.forget());
PRBool relevantLinkVisited =
aIsLink ? aIsVisitedLink
: (aParentContext && aParentContext->RelevantLinkVisited());
if (relevantLinkVisited) {
result->AddStyleBit(NS_STYLE_RELEVANT_LINK_VISITED);
}
}
if (!aParentContext)
mRoots.AppendElement(result);
}
else {
NS_ASSERTION(result->GetPseudoType() == aPseudoType, "Unexpected type");
NS_ASSERTION(result->GetPseudo() == aPseudoTag, "Unexpected pseudo");
}
return result.forget();
}
void
nsStyleSet::AddImportantRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode,
nsRuleWalker* aRuleWalker)
{
NS_ASSERTION(aCurrLevelNode &&
aCurrLevelNode != aLastPrevLevelNode, "How did we get here?");
nsAutoTArray<nsIStyleRule*, 16> importantRules;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
// We guarantee that we never walk the root node here, so no need
// to null-check GetRule().
nsIStyleRule* impRule = node->GetRule()->GetImportantRule();
if (impRule)
importantRules.AppendElement(impRule);
}
NS_ASSERTION(importantRules.Length() != 0,
"Why did we think there were important rules?");
for (PRUint32 i = importantRules.Length(); i-- != 0; ) {
aRuleWalker->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();
if (rule) {
NS_ASSERTION(!rule->GetImportantRule(), "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,
void* aData, nsIContent* aContent,
nsRuleWalker* aRuleWalker)
{
// 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!");
aRuleWalker->SetLevel(eAgentSheet, PR_FALSE, PR_TRUE);
if (mRuleProcessors[eAgentSheet])
(*aCollectorFunc)(mRuleProcessors[eAgentSheet], aData);
nsRuleNode* lastAgentRN = aRuleWalker->CurrentNode();
PRBool haveImportantUARules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(ePresHintSheet, PR_FALSE, PR_FALSE);
if (mRuleProcessors[ePresHintSheet])
(*aCollectorFunc)(mRuleProcessors[ePresHintSheet], aData);
nsRuleNode* lastPresHintRN = aRuleWalker->CurrentNode();
aRuleWalker->SetLevel(eUserSheet, PR_FALSE, PR_TRUE);
PRBool skipUserStyles =
aContent && aContent->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different
(*aCollectorFunc)(mRuleProcessors[eUserSheet], aData);
nsRuleNode* lastUserRN = aRuleWalker->CurrentNode();
PRBool haveImportantUserRules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(eHTMLPresHintSheet, PR_FALSE, PR_FALSE);
if (mRuleProcessors[eHTMLPresHintSheet])
(*aCollectorFunc)(mRuleProcessors[eHTMLPresHintSheet], aData);
nsRuleNode* lastHTMLPresHintRN = aRuleWalker->CurrentNode();
aRuleWalker->SetLevel(eDocSheet, PR_FALSE, PR_TRUE);
PRBool cutOffInheritance = PR_FALSE;
if (mBindingManager && aContent) {
// We can supply additional document-level sheets that should be walked.
mBindingManager->WalkRules(aCollectorFunc,
static_cast<RuleProcessorData*>(aData),
&cutOffInheritance);
}
if (!skipUserStyles && !cutOffInheritance &&
mRuleProcessors[eDocSheet]) // NOTE: different
(*aCollectorFunc)(mRuleProcessors[eDocSheet], aData);
aRuleWalker->SetLevel(eStyleAttrSheet, PR_FALSE,
aRuleWalker->GetCheckForImportantRules());
if (mRuleProcessors[eStyleAttrSheet])
(*aCollectorFunc)(mRuleProcessors[eStyleAttrSheet], aData);
nsRuleNode* lastDocRN = aRuleWalker->CurrentNode();
PRBool haveImportantDocRules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(eOverrideSheet, PR_FALSE, PR_TRUE);
if (mRuleProcessors[eOverrideSheet])
(*aCollectorFunc)(mRuleProcessors[eOverrideSheet], aData);
nsRuleNode* lastOvrRN = aRuleWalker->CurrentNode();
PRBool haveImportantOverrideRules = !aRuleWalker->GetCheckForImportantRules();
if (haveImportantDocRules) {
aRuleWalker->SetLevel(eDocSheet, PR_TRUE, PR_FALSE);
AddImportantRules(lastDocRN, lastHTMLPresHintRN, aRuleWalker); // doc
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastDocRN, lastHTMLPresHintRN);
}
#endif
if (haveImportantOverrideRules) {
aRuleWalker->SetLevel(eOverrideSheet, PR_TRUE, PR_FALSE);
AddImportantRules(lastOvrRN, lastDocRN, aRuleWalker); // override
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastOvrRN, lastDocRN);
}
#endif
#ifdef DEBUG
AssertNoCSSRules(lastHTMLPresHintRN, lastUserRN);
AssertNoImportantRules(lastHTMLPresHintRN, lastUserRN); // HTML preshints
#endif
if (haveImportantUserRules) {
aRuleWalker->SetLevel(eUserSheet, PR_TRUE, PR_FALSE);
AddImportantRules(lastUserRN, lastPresHintRN, aRuleWalker); //user
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastUserRN, lastPresHintRN);
}
#endif
#ifdef DEBUG
AssertNoCSSRules(lastPresHintRN, lastAgentRN);
AssertNoImportantRules(lastPresHintRN, lastAgentRN); // preshints
#endif
if (haveImportantUARules) {
aRuleWalker->SetLevel(eAgentSheet, PR_TRUE, PR_FALSE);
AddImportantRules(lastAgentRN, mRuleTree, aRuleWalker); //agent
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastAgentRN, mRuleTree);
}
#endif
#ifdef DEBUG
nsRuleNode *lastImportantRN = aRuleWalker->CurrentNode();
#endif
aRuleWalker->SetLevel(eTransitionSheet, PR_FALSE, PR_FALSE);
(*aCollectorFunc)(mRuleProcessors[eTransitionSheet], aData);
#ifdef DEBUG
AssertNoCSSRules(aRuleWalker->CurrentNode(), lastImportantRN);
AssertNoImportantRules(aRuleWalker->CurrentNode(), lastImportantRN);
#endif
}
// 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,
PRBool aWalkAllXBLStylesheets)
{
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->mElement->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.
if (aWalkAllXBLStylesheets) {
mBindingManager->WalkAllRules(aFunc, aData);
} else {
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);
(*aFunc)(mRuleProcessors[eTransitionSheet], 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(Element* aElement,
nsStyleContext* aParentContext)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
NS_ASSERTION(aElement, "aElement must not be null");
nsRuleWalker ruleWalker(mRuleTree);
ElementRuleProcessorData data(PresContext(), aElement, &ruleWalker);
FileRules(EnumRulesMatching<ElementRuleProcessorData>, &data, aElement,
&ruleWalker);
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
nsRuleNode *visitedRuleNode = nsnull;
if (ruleWalker.HaveRelevantLink()) {
ruleWalker.ResetForVisitedMatching();
FileRules(EnumRulesMatching<ElementRuleProcessorData>, &data, aElement,
&ruleWalker);
visitedRuleNode = ruleWalker.CurrentNode();
}
return GetContext(aParentContext, ruleNode, visitedRuleNode,
data.IsLink(),
(data.ContentState() & NS_EVENT_STATE_VISITED) != 0,
nsnull, nsCSSPseudoElements::ePseudo_NotPseudoElement);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleForRules(nsStyleContext* aParentContext,
const nsCOMArray<nsIStyleRule> &aRules)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
nsRuleWalker ruleWalker(mRuleTree);
// FIXME: Perhaps this should be passed in, but it probably doesn't
// matter.
ruleWalker.SetLevel(eDocSheet, PR_FALSE, PR_FALSE);
for (PRInt32 i = 0; i < aRules.Count(); i++) {
ruleWalker.Forward(aRules.ObjectAt(i));
}
return GetContext(aParentContext, ruleWalker.CurrentNode(), nsnull,
PR_FALSE, PR_FALSE,
nsnull, nsCSSPseudoElements::ePseudo_NotPseudoElement);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleByAddingRules(nsStyleContext* aBaseContext,
const nsCOMArray<nsIStyleRule> &aRules)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
nsRuleWalker ruleWalker(mRuleTree);
ruleWalker.SetCurrentNode(aBaseContext->GetRuleNode());
// FIXME: Perhaps this should be passed in, but it probably doesn't
// matter.
ruleWalker.SetLevel(eDocSheet, PR_FALSE, PR_FALSE);
for (PRInt32 i = 0; i < aRules.Count(); i++) {
ruleWalker.Forward(aRules.ObjectAt(i));
}
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
nsRuleNode *visitedRuleNode = nsnull;
if (aBaseContext->GetStyleIfVisited()) {
ruleWalker.SetCurrentNode(aBaseContext->GetStyleIfVisited()->GetRuleNode());
for (PRInt32 i = 0; i < aRules.Count(); i++) {
ruleWalker.Forward(aRules.ObjectAt(i));
}
visitedRuleNode = ruleWalker.CurrentNode();
}
return GetContext(aBaseContext->GetParent(), ruleNode, visitedRuleNode,
// bogus values for aIsLink and aIsVisitedLink that
// we know will make GetContext do the right thing.
PR_TRUE, aBaseContext->RelevantLinkVisited(),
aBaseContext->GetPseudo(),
aBaseContext->GetPseudoType());
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleForNonElement(nsStyleContext* aParentContext)
{
return GetContext(aParentContext, mRuleTree, nsnull,
PR_FALSE, PR_FALSE,
nsCSSAnonBoxes::mozNonElement,
nsCSSPseudoElements::ePseudo_AnonBox);
}
void
nsStyleSet::WalkRestrictionRule(nsCSSPseudoElements::Type aPseudoType,
nsRuleWalker* aRuleWalker)
{
// This needs to match GetPseudoRestriction in nsRuleNode.cpp.
aRuleWalker->SetLevel(eAgentSheet, PR_FALSE, PR_FALSE);
if (aPseudoType == nsCSSPseudoElements::ePseudo_firstLetter)
aRuleWalker->Forward(mFirstLetterRule);
else if (aPseudoType == nsCSSPseudoElements::ePseudo_firstLine)
aRuleWalker->Forward(mFirstLineRule);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolvePseudoElementStyle(Element* aParentElement,
nsCSSPseudoElements::Type aType,
nsStyleContext* aParentContext)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount,
"must have pseudo element type");
NS_ASSERTION(aParentElement, "Must have parent element");
nsRuleWalker ruleWalker(mRuleTree);
PseudoElementRuleProcessorData data(PresContext(), aParentElement,
&ruleWalker, aType);
WalkRestrictionRule(aType, &ruleWalker);
FileRules(EnumRulesMatching<PseudoElementRuleProcessorData>, &data,
aParentElement, &ruleWalker);
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
nsRuleNode *visitedRuleNode = nsnull;
if (ruleWalker.HaveRelevantLink()) {
ruleWalker.ResetForVisitedMatching();
FileRules(EnumRulesMatching<PseudoElementRuleProcessorData>, &data,
aParentElement, &ruleWalker);
visitedRuleNode = ruleWalker.CurrentNode();
}
return GetContext(aParentContext, ruleNode, visitedRuleNode,
// For pseudos, |data.IsLink()| being true means that
// our parent node is a link.
PR_FALSE, PR_FALSE,
nsCSSPseudoElements::GetPseudoAtom(aType), aType);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ProbePseudoElementStyle(Element* aParentElement,
nsCSSPseudoElements::Type aType,
nsStyleContext* aParentContext)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount,
"must have pseudo element type");
NS_ASSERTION(aParentElement, "aParentElement must not be null");
nsIAtom* pseudoTag = nsCSSPseudoElements::GetPseudoAtom(aType);
nsRuleWalker ruleWalker(mRuleTree);
PseudoElementRuleProcessorData data(PresContext(), aParentElement,
&ruleWalker, aType);
WalkRestrictionRule(aType, &ruleWalker);
// not the root if there was a restriction rule
nsRuleNode *adjustedRoot = ruleWalker.CurrentNode();
FileRules(EnumRulesMatching<PseudoElementRuleProcessorData>, &data,
aParentElement, &ruleWalker);
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
if (ruleNode == adjustedRoot) {
return nsnull;
}
nsRuleNode *visitedRuleNode = nsnull;
if (ruleWalker.HaveRelevantLink()) {
ruleWalker.ResetForVisitedMatching();
FileRules(EnumRulesMatching<PseudoElementRuleProcessorData>, &data,
aParentElement, &ruleWalker);
visitedRuleNode = ruleWalker.CurrentNode();
}
nsRefPtr<nsStyleContext> result =
GetContext(aParentContext, ruleNode, visitedRuleNode,
// For pseudos, |data.IsLink()| being true means that
// our parent node is a link.
PR_FALSE, PR_FALSE,
pseudoTag, aType);
// 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 &&
(pseudoTag == nsCSSPseudoElements::before ||
pseudoTag == 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 = nsnull;
}
}
return result.forget();
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveAnonymousBoxStyle(nsIAtom* aPseudoTag,
nsStyleContext* aParentContext)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
#ifdef DEBUG
PRBool isAnonBox = nsCSSAnonBoxes::IsAnonBox(aPseudoTag)
#ifdef MOZ_XUL
&& !nsCSSAnonBoxes::IsTreePseudoElement(aPseudoTag)
#endif
;
NS_PRECONDITION(isAnonBox, "Unexpected pseudo");
#endif
nsRuleWalker ruleWalker(mRuleTree);
AnonBoxRuleProcessorData data(PresContext(), aPseudoTag, &ruleWalker);
FileRules(EnumRulesMatching<AnonBoxRuleProcessorData>, &data, nsnull,
&ruleWalker);
return GetContext(aParentContext, ruleWalker.CurrentNode(), nsnull,
PR_FALSE, PR_FALSE,
aPseudoTag, nsCSSPseudoElements::ePseudo_AnonBox);
}
#ifdef MOZ_XUL
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveXULTreePseudoStyle(Element* aParentElement,
nsIAtom* aPseudoTag,
nsStyleContext* aParentContext,
nsICSSPseudoComparator* aComparator)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
NS_ASSERTION(aPseudoTag, "must have pseudo tag");
NS_ASSERTION(nsCSSAnonBoxes::IsTreePseudoElement(aPseudoTag),
"Unexpected pseudo");
nsRuleWalker ruleWalker(mRuleTree);
XULTreeRuleProcessorData data(PresContext(), aParentElement, &ruleWalker,
aPseudoTag, aComparator);
FileRules(EnumRulesMatching<XULTreeRuleProcessorData>, &data, aParentElement,
&ruleWalker);
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
nsRuleNode *visitedRuleNode = nsnull;
if (ruleWalker.HaveRelevantLink()) {
ruleWalker.ResetForVisitedMatching();
FileRules(EnumRulesMatching<XULTreeRuleProcessorData>, &data,
aParentElement, &ruleWalker);
visitedRuleNode = ruleWalker.CurrentNode();
}
return GetContext(aParentContext, ruleNode, visitedRuleNode,
// For pseudos, |data.IsLink()| being true means that
// our parent node is a link.
PR_FALSE, PR_FALSE,
aPseudoTag, nsCSSPseudoElements::ePseudo_XULTree);
}
#endif
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)
{
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 PRUint32 kGCInterval = 300;
void
nsStyleSet::NotifyStyleContextDestroyed(nsPresContext* aPresContext,
nsStyleContext* aStyleContext)
{
if (mInShutdown)
return;
// 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 (mUnusedRuleNodeCount == kGCInterval) {
GCRuleTrees();
}
}
void
nsStyleSet::GCRuleTrees()
{
mUnusedRuleNodeCount = 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(nsStyleContext* aStyleContext,
nsStyleContext* aNewParentContext)
{
if (!aStyleContext) {
NS_NOTREACHED("must have style context");
return nsnull;
}
if (aStyleContext->GetParent() == aNewParentContext) {
aStyleContext->AddRef();
return aStyleContext;
}
nsIAtom* pseudoTag = aStyleContext->GetPseudo();
nsCSSPseudoElements::Type pseudoType = aStyleContext->GetPseudoType();
nsRuleNode* ruleNode = aStyleContext->GetRuleNode();
nsRuleNode* visitedRuleNode = nsnull;
nsStyleContext* visitedContext = aStyleContext->GetStyleIfVisited();
if (visitedContext) {
visitedRuleNode = visitedContext->GetRuleNode();
}
return GetContext(aNewParentContext, ruleNode, visitedRuleNode,
// bogus values for aIsLink and aIsVisitedLink that
// we know will make GetContext do the right thing.
PR_TRUE, aStyleContext->RelevantLinkVisited(),
pseudoTag, pseudoType);
}
struct StatefulData : public StateRuleProcessorData {
StatefulData(nsPresContext* aPresContext,
Element* aElement, PRInt32 aStateMask)
: StateRuleProcessorData(aPresContext, aElement, aStateMask),
mHint(nsRestyleHint(0))
{}
nsRestyleHint mHint;
};
static PRBool SheetHasDocumentStateStyle(nsIStyleRuleProcessor* aProcessor,
void *aData)
{
StatefulData* data = (StatefulData*)aData;
if (aProcessor->HasDocumentStateDependentStyle(data)) {
data->mHint = eRestyle_Self;
return PR_FALSE; // don't continue
}
return PR_TRUE; // continue
}
// Test if style is dependent on a document state.
PRBool
nsStyleSet::HasDocumentStateDependentStyle(nsPresContext* aPresContext,
nsIContent* aContent,
PRInt32 aStateMask)
{
if (!aContent || !aContent->IsElement())
return PR_FALSE;
StatefulData data(aPresContext, aContent->AsElement(), aStateMask);
WalkRuleProcessors(SheetHasDocumentStateStyle, &data, PR_TRUE);
return data.mHint != 0;
}
static PRBool SheetHasStatefulStyle(nsIStyleRuleProcessor* aProcessor,
void *aData)
{
StatefulData* data = (StatefulData*)aData;
nsRestyleHint hint = aProcessor->HasStateDependentStyle(data);
data->mHint = nsRestyleHint(data->mHint | hint);
return PR_TRUE; // continue
}
// Test if style is dependent on content state
nsRestyleHint
nsStyleSet::HasStateDependentStyle(nsPresContext* aPresContext,
Element* aElement,
PRInt32 aStateMask)
{
StatefulData data(aPresContext, aElement, aStateMask);
WalkRuleProcessors(SheetHasStatefulStyle, &data, PR_FALSE);
return data.mHint;
}
struct AttributeData : public AttributeRuleProcessorData {
AttributeData(nsPresContext* aPresContext,
Element* aElement, nsIAtom* aAttribute, PRInt32 aModType,
PRBool aAttrHasChanged)
: AttributeRuleProcessorData(aPresContext, aElement, aAttribute, aModType,
aAttrHasChanged),
mHint(nsRestyleHint(0))
{}
nsRestyleHint mHint;
};
static PRBool
SheetHasAttributeStyle(nsIStyleRuleProcessor* aProcessor, void *aData)
{
AttributeData* data = (AttributeData*)aData;
nsRestyleHint hint = aProcessor->HasAttributeDependentStyle(data);
data->mHint = nsRestyleHint(data->mHint | hint);
return PR_TRUE; // continue
}
// Test if style is dependent on content state
nsRestyleHint
nsStyleSet::HasAttributeDependentStyle(nsPresContext* aPresContext,
Element* aElement,
nsIAtom* aAttribute,
PRInt32 aModType,
PRBool aAttrHasChanged)
{
AttributeData data(aPresContext, aElement, aAttribute,
aModType, aAttrHasChanged);
WalkRuleProcessors(SheetHasAttributeStyle, &data, PR_FALSE);
return data.mHint;
}
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;
}
nsCSSStyleSheet::EnsureUniqueInnerResult
nsStyleSet::EnsureUniqueInnerOnCSSSheets()
{
nsAutoTArray<nsCSSStyleSheet*, 32> queue;
for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(gCSSSheetTypes); ++i) {
nsCOMArray<nsIStyleSheet> &sheets = mSheets[gCSSSheetTypes[i]];
for (PRUint32 j = 0, j_end = sheets.Count(); j < j_end; ++j) {
nsCSSStyleSheet *sheet = static_cast<nsCSSStyleSheet*>(sheets[j]);
if (!queue.AppendElement(sheet)) {
return nsCSSStyleSheet::eUniqueInner_CloneFailed;
}
}
}
nsCSSStyleSheet::EnsureUniqueInnerResult res =
nsCSSStyleSheet::eUniqueInner_AlreadyUnique;
while (!queue.IsEmpty()) {
PRUint32 idx = queue.Length() - 1;
nsCSSStyleSheet *sheet = queue[idx];
queue.RemoveElementAt(idx);
nsCSSStyleSheet::EnsureUniqueInnerResult sheetRes =
sheet->EnsureUniqueInner();
if (sheetRes == nsCSSStyleSheet::eUniqueInner_CloneFailed) {
return sheetRes;
}
if (sheetRes == nsCSSStyleSheet::eUniqueInner_ClonedInner) {
res = sheetRes;
}
// Enqueue all the sheet's children.
if (!sheet->AppendAllChildSheets(queue)) {
return nsCSSStyleSheet::eUniqueInner_CloneFailed;
}
}
return res;
}
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