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nsStyleSet.cpp
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nsStyleSet.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* 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 "mozilla/Util.h"
#include "nsStyleSet.h"
#include "nsNetUtil.h"
#include "nsCSSStyleSheet.h"
#include "nsIDocument.h"
#include "nsRuleWalker.h"
#include "nsStyleContext.h"
#include "mozilla/css/StyleRule.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSRuleProcessor.h"
#include "nsIContent.h"
#include "nsIFrame.h"
#include "nsContentUtils.h"
#include "nsRuleData.h"
#include "nsRuleProcessorData.h"
#include "nsTransitionManager.h"
#include "nsAnimationManager.h"
#include "nsEventStates.h"
#include "mozilla/dom/Element.h"
using namespace mozilla;
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
NS_IMPL_ISUPPORTS1(nsInitialStyleRule, nsIStyleRule)
/* virtual */ void
nsInitialStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
// Iterate over the property groups
for (nsStyleStructID sid = nsStyleStructID(0);
sid < nsStyleStructID_Length; sid = nsStyleStructID(sid + 1)) {
if (aRuleData->mSIDs & (1 << sid)) {
// Iterate over nsCSSValues within the property group
nsCSSValue * const value_start =
aRuleData->mValueStorage + aRuleData->mValueOffsets[sid];
for (nsCSSValue *value = value_start,
*value_end = value + nsCSSProps::PropertyCountInStruct(sid);
value != value_end; ++value) {
// If MathML is disabled take care not to set MathML properties (or we
// will trigger assertions in nsRuleNode)
if (sid == eStyleStruct_Font &&
!aRuleData->mPresContext->Document()->GetMathMLEnabled()) {
size_t index = value - value_start;
if (index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_script_level) ||
index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_script_size_multiplier) ||
index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_script_min_size)) {
continue;
}
}
if (value->GetUnit() == eCSSUnit_Null) {
value->SetInitialValue();
}
}
}
}
}
#ifdef DEBUG
/* virtual */ void
nsInitialStyleRule::List(FILE* out, PRInt32 aIndent) const
{
}
#endif
static const nsStyleSet::sheetType gCSSSheetTypes[] = {
nsStyleSet::eAgentSheet,
nsStyleSet::eUserSheet,
nsStyleSet::eDocSheet,
nsStyleSet::eOverrideSheet
};
nsStyleSet::nsStyleSet()
: mRuleTree(nsnull),
mBatching(0),
mInShutdown(false),
mAuthorStyleDisabled(false),
mInReconstruct(false),
mDirty(0),
mUnusedRuleNodeCount(0)
{
}
size_t
nsStyleSet::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
for (int i = 0; i < eSheetTypeCount; i++) {
if (mRuleProcessors[i]) {
n += mRuleProcessors[i]->SizeOfIncludingThis(aMallocSizeOf);
}
}
return n;
}
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(eAnimationSheet);
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 = true;
mRuleTree = newTree;
return NS_OK;
}
void
nsStyleSet::EndReconstruct()
{
NS_ASSERTION(mInReconstruct, "Unmatched begin/end?");
mInReconstruct = 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 == eStyleAttrSheet)) {
//don't regather if this level is disabled
return NS_OK;
}
if (aType == eAnimationSheet) {
// We have no sheet for the animations level; just a rule
// processor. (XXX: We should probably do this for the other
// non-CSS levels too!)
mRuleProcessors[aType] = PresContext()->AnimationManager();
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;
}
bool
nsStyleSet::GetAuthorStyleDisabled()
{
return mAuthorStyleDisabled;
}
nsresult
nsStyleSet::SetAuthorStyleDisabled(bool aStyleDisabled)
{
if (aStyleDisabled == !mAuthorStyleDisabled) {
mAuthorStyleDisabled = aStyleDisabled;
BeginUpdate();
mDirty |= 1 << eDocSheet |
1 << ePresHintSheet |
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(bool aEnable)
{
#ifdef DEBUG
bool 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 bool
EnumRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData)
{
T* data = static_cast<T*>(aData);
aProcessor->RulesMatching(data);
return true;
}
static inline bool
IsMoreSpecificThanAnimation(nsRuleNode *aRuleNode)
{
return !aRuleNode->IsRoot() &&
(aRuleNode->GetLevel() == nsStyleSet::eTransitionSheet ||
(aRuleNode->IsImportantRule() &&
(aRuleNode->GetLevel() == nsStyleSet::eAgentSheet ||
aRuleNode->GetLevel() == nsStyleSet::eUserSheet)));
}
static nsIStyleRule*
GetAnimationRule(nsRuleNode *aRuleNode)
{
nsRuleNode *n = aRuleNode;
while (IsMoreSpecificThanAnimation(n)) {
n = n->GetParent();
}
if (n->IsRoot() || n->GetLevel() != nsStyleSet::eAnimationSheet) {
return nsnull;
}
return n->GetRule();
}
static nsRuleNode*
ReplaceAnimationRule(nsRuleNode *aOldRuleNode,
nsIStyleRule *aOldAnimRule,
nsIStyleRule *aNewAnimRule)
{
nsTArray<nsRuleNode*> moreSpecificNodes;
nsRuleNode *n = aOldRuleNode;
while (IsMoreSpecificThanAnimation(n)) {
moreSpecificNodes.AppendElement(n);
n = n->GetParent();
}
if (aOldAnimRule) {
NS_ABORT_IF_FALSE(n->GetRule() == aOldAnimRule, "wrong rule");
NS_ABORT_IF_FALSE(n->GetLevel() == nsStyleSet::eAnimationSheet,
"wrong level");
n = n->GetParent();
}
NS_ABORT_IF_FALSE(!IsMoreSpecificThanAnimation(n) &&
n->GetLevel() != nsStyleSet::eAnimationSheet,
"wrong level");
if (aNewAnimRule) {
n = n->Transition(aNewAnimRule, nsStyleSet::eAnimationSheet, false);
}
for (PRUint32 i = moreSpecificNodes.Length(); i-- != 0; ) {
nsRuleNode *oldNode = moreSpecificNodes[i];
n = n->Transition(oldNode->GetRule(), oldNode->GetLevel(),
oldNode->IsImportantRule());
}
return n;
}
/**
* |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,
bool aIsLink,
bool aIsVisitedLink,
nsIAtom* aPseudoTag,
nsCSSPseudoElements::Type aPseudoType,
bool aDoAnimations,
Element* aElementForAnimation)
{
NS_PRECONDITION((!aPseudoTag &&
aPseudoType ==
nsCSSPseudoElements::ePseudo_NotPseudoElement) ||
(aPseudoTag &&
nsCSSPseudoElements::GetPseudoType(aPseudoTag) ==
aPseudoType),
"Pseudo mismatch");
if (aVisitedRuleNode == aRuleNode) {
// No need to force creation of a visited style in this case.
aVisitedRuleNode = nsnull;
}
// 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());
bool 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");
}
if (aDoAnimations) {
// Normally the animation manager has already added the correct
// style rule. However, if the animation-name just changed, it
// might have been wrong. So ask it to double-check based on the
// resulting style context.
nsIStyleRule *oldAnimRule = GetAnimationRule(aRuleNode);
nsIStyleRule *animRule = PresContext()->AnimationManager()->
CheckAnimationRule(result, aElementForAnimation);
NS_ABORT_IF_FALSE(result->GetRuleNode() == aRuleNode,
"unexpected rule node");
NS_ABORT_IF_FALSE(!result->GetStyleIfVisited() == !aVisitedRuleNode,
"unexpected visited rule node");
NS_ABORT_IF_FALSE(!aVisitedRuleNode ||
result->GetStyleIfVisited()->GetRuleNode() ==
aVisitedRuleNode,
"unexpected visited rule node");
if (oldAnimRule != animRule) {
nsRuleNode *ruleNode =
ReplaceAnimationRule(aRuleNode, oldAnimRule, animRule);
nsRuleNode *visitedRuleNode = aVisitedRuleNode
? ReplaceAnimationRule(aVisitedRuleNode, oldAnimRule, animRule)
: nsnull;
result = GetContext(aParentContext, ruleNode, visitedRuleNode,
aIsLink, aIsVisitedLink,
aPseudoTag, aPseudoType, false, nsnull);
}
}
if (aElementForAnimation && aElementForAnimation->IsHTML(nsGkAtoms::body) &&
aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement &&
PresContext()->CompatibilityMode() == eCompatibility_NavQuirks) {
nsIDocument* doc = aElementForAnimation->GetCurrentDoc();
if (doc && doc->GetBodyElement() == aElementForAnimation) {
// Update the prescontext's body color
PresContext()->SetBodyTextColor(result->GetStyleColor()->mColor);
}
}
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(). Furthermore, it must be a CSS rule.
NS_ASSERTION(nsRefPtr<css::StyleRule>(do_QueryObject(node->GetRule())),
"Unexpected non-CSS rule");
nsIStyleRule* impRule =
static_cast<css::StyleRule*>(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()) {
nsRefPtr<css::StyleRule> rule(do_QueryObject(node->GetRule()));
NS_ASSERTION(rule, "Unexpected non-CSS 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();
nsRefPtr<css::StyleRule> cssRule(do_QueryObject(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. User normal rules = User normal
// 3. Presentation hints = PresHint normal
// 4. Author normal rules = Document normal
// 5. Override normal rules = Override normal
// 6. Author !important rules = Document !important
// 7. Override !important rules = Override !important
// -. animation rules = Animation normal
// 8. User !important rules = User !important
// 9. UA !important rules = Agent !important
// -. transition rules = Transition normal
// [most important]
// Save off the last rule before we start walking our agent sheets;
// this will be either the root or one of the restriction rules.
nsRuleNode* lastRestrictionRN = aRuleWalker->CurrentNode();
aRuleWalker->SetLevel(eAgentSheet, false, true);
if (mRuleProcessors[eAgentSheet])
(*aCollectorFunc)(mRuleProcessors[eAgentSheet], aData);
nsRuleNode* lastAgentRN = aRuleWalker->CurrentNode();
bool haveImportantUARules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(eUserSheet, false, true);
bool skipUserStyles =
aContent && aContent->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different
(*aCollectorFunc)(mRuleProcessors[eUserSheet], aData);
nsRuleNode* lastUserRN = aRuleWalker->CurrentNode();
bool haveImportantUserRules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(ePresHintSheet, false, false);
if (mRuleProcessors[ePresHintSheet])
(*aCollectorFunc)(mRuleProcessors[ePresHintSheet], aData);
nsRuleNode* lastPresHintRN = aRuleWalker->CurrentNode();
aRuleWalker->SetLevel(eDocSheet, false, true);
bool cutOffInheritance = 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, false,
aRuleWalker->GetCheckForImportantRules());
if (mRuleProcessors[eStyleAttrSheet])
(*aCollectorFunc)(mRuleProcessors[eStyleAttrSheet], aData);
nsRuleNode* lastDocRN = aRuleWalker->CurrentNode();
bool haveImportantDocRules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(eOverrideSheet, false, true);
if (mRuleProcessors[eOverrideSheet])
(*aCollectorFunc)(mRuleProcessors[eOverrideSheet], aData);
nsRuleNode* lastOvrRN = aRuleWalker->CurrentNode();
bool haveImportantOverrideRules = !aRuleWalker->GetCheckForImportantRules();
if (haveImportantDocRules) {
aRuleWalker->SetLevel(eDocSheet, true, false);
AddImportantRules(lastDocRN, lastPresHintRN, aRuleWalker); // doc
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastDocRN, lastPresHintRN);
}
#endif
if (haveImportantOverrideRules) {
aRuleWalker->SetLevel(eOverrideSheet, true, false);
AddImportantRules(lastOvrRN, lastDocRN, aRuleWalker); // override
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastOvrRN, lastDocRN);
}
#endif
// This needs to match IsMoreSpecificThanAnimation() above.
aRuleWalker->SetLevel(eAnimationSheet, false, false);
(*aCollectorFunc)(mRuleProcessors[eAnimationSheet], aData);
#ifdef DEBUG
AssertNoCSSRules(lastPresHintRN, lastUserRN);
#endif
if (haveImportantUserRules) {
aRuleWalker->SetLevel(eUserSheet, true, false);
AddImportantRules(lastUserRN, lastAgentRN, aRuleWalker); //user
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastUserRN, lastAgentRN);
}
#endif
if (haveImportantUARules) {
aRuleWalker->SetLevel(eAgentSheet, true, false);
AddImportantRules(lastAgentRN, lastRestrictionRN, aRuleWalker); //agent
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastAgentRN, lastRestrictionRN);
}
#endif
#ifdef DEBUG
AssertNoCSSRules(lastRestrictionRN, mRuleTree);
#endif
#ifdef DEBUG
nsRuleNode *lastImportantRN = aRuleWalker->CurrentNode();
#endif
aRuleWalker->SetLevel(eTransitionSheet, false, false);
(*aCollectorFunc)(mRuleProcessors[eTransitionSheet], aData);
#ifdef DEBUG
AssertNoCSSRules(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,
bool aWalkAllXBLStylesheets)
{
if (mRuleProcessors[eAgentSheet])
(*aFunc)(mRuleProcessors[eAgentSheet], aData);
bool skipUserStyles = aData->mElement->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different
(*aFunc)(mRuleProcessors[eUserSheet], aData);
if (mRuleProcessors[ePresHintSheet])
(*aFunc)(mRuleProcessors[ePresHintSheet], aData);
bool cutOffInheritance = 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[eAnimationSheet], aData);
(*aFunc)(mRuleProcessors[eTransitionSheet], aData);
}
bool nsStyleSet::BuildDefaultStyleData(nsPresContext* aPresContext)
{
NS_ASSERTION(!mDefaultStyleData.mResetData &&
!mDefaultStyleData.mInheritedData,
"leaking default style data");
mDefaultStyleData.mResetData = new (aPresContext) nsResetStyleData;
if (!mDefaultStyleData.mResetData)
return false;
mDefaultStyleData.mInheritedData = new (aPresContext) nsInheritedStyleData;
if (!mDefaultStyleData.mInheritedData)
return false;
#define SSARG_PRESCONTEXT aPresContext
#define CREATE_DATA(name, type, args) \
if (!(mDefaultStyleData.m##type##Data->mStyleStructs[eStyleStruct_##name] = \
new (aPresContext) nsStyle##name args)) \
return 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 true;
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleFor(Element* aElement,
nsStyleContext* aParentContext)
{
TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aElement->OwnerDoc());
return ResolveStyleFor(aElement, aParentContext, treeContext);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleFor(Element* aElement,
nsStyleContext* aParentContext,
TreeMatchContext& aTreeMatchContext)
{
NS_ENSURE_FALSE(mInShutdown, nsnull);
NS_ASSERTION(aElement, "aElement must not be null");
nsRuleWalker ruleWalker(mRuleTree);
aTreeMatchContext.ResetForUnvisitedMatching();
ElementRuleProcessorData data(PresContext(), aElement, &ruleWalker,
aTreeMatchContext);
FileRules(EnumRulesMatching<ElementRuleProcessorData>, &data, aElement,
&ruleWalker);
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
nsRuleNode *visitedRuleNode = nsnull;
if (aTreeMatchContext.HaveRelevantLink()) {
aTreeMatchContext.ResetForVisitedMatching();
ruleWalker.Reset();
FileRules(EnumRulesMatching<ElementRuleProcessorData>, &data, aElement,
&ruleWalker);
visitedRuleNode = ruleWalker.CurrentNode();
}
return GetContext(aParentContext, ruleNode, visitedRuleNode,
nsCSSRuleProcessor::IsLink(aElement),
nsCSSRuleProcessor::GetContentState(aElement, aTreeMatchContext).
HasState(NS_EVENT_STATE_VISITED),
nsnull, nsCSSPseudoElements::ePseudo_NotPseudoElement,
true, aElement);
}
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, false, false);
for (PRInt32 i = 0; i < aRules.Count(); i++) {
ruleWalker.ForwardOnPossiblyCSSRule(aRules.ObjectAt(i));
}
return GetContext(aParentContext, ruleWalker.CurrentNode(), nsnull,
false, false,
nsnull, nsCSSPseudoElements::ePseudo_NotPseudoElement,
false, nsnull);
}
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, false, false);
for (PRInt32 i = 0; i < aRules.Count(); i++) {
ruleWalker.ForwardOnPossiblyCSSRule(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.ForwardOnPossiblyCSSRule(aRules.ObjectAt(i));