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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /layout/style/Rule.h | |
parent | Initial commit. (diff) | |
download | thunderbird-upstream.tar.xz thunderbird-upstream.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | layout/style/Rule.h | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/layout/style/Rule.h b/layout/style/Rule.h new file mode 100644 index 0000000000..fb24a5eaae --- /dev/null +++ b/layout/style/Rule.h @@ -0,0 +1,143 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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/. */ + +/* base class for all rule types in a CSS style sheet */ + +#ifndef mozilla_css_Rule_h___ +#define mozilla_css_Rule_h___ + +#include "mozilla/dom/CSSRuleBinding.h" +#include "mozilla/dom/DocumentOrShadowRoot.h" +#include "mozilla/StyleSheet.h" +#include "mozilla/MemoryReporting.h" +#include "nsISupports.h" +#include "nsWrapperCache.h" + +struct nsRuleData; +template <class T> +struct already_AddRefed; +class nsHTMLCSSStyleSheet; + +namespace mozilla { + +enum class StyleCssRuleType : uint8_t; + +namespace css { +class GroupRule; + +class Rule : public nsISupports, public nsWrapperCache { + protected: + Rule(StyleSheet* aSheet, Rule* aParentRule, uint32_t aLineNumber, + uint32_t aColumnNumber) + : mSheet(aSheet), + mParentRule(aParentRule), + mLineNumber(aLineNumber), + mColumnNumber(aColumnNumber) { +#ifdef DEBUG + AssertParentRuleType(); +#endif + } + +#ifdef DEBUG + void AssertParentRuleType(); +#endif + + Rule(const Rule& aCopy) + : mSheet(aCopy.mSheet), + mParentRule(aCopy.mParentRule), + mLineNumber(aCopy.mLineNumber), + mColumnNumber(aCopy.mColumnNumber) {} + + virtual ~Rule() = default; + + public: + NS_DECL_CYCLE_COLLECTING_ISUPPORTS + NS_DECL_CYCLE_COLLECTION_SKIPPABLE_WRAPPERCACHE_CLASS(Rule) + // Return true if this rule is known to be a cycle collection leaf, in the + // sense that it doesn't have any outgoing owning edges. + virtual bool IsCCLeaf() const MOZ_MUST_OVERRIDE; + +#ifdef DEBUG + virtual void List(FILE* out = stdout, int32_t aIndent = 0) const = 0; +#endif + + StyleSheet* GetStyleSheet() const { return mSheet; } + + // Clear the mSheet pointer on this rule and descendants. + virtual void DropSheetReference(); + + // Clear the mParentRule pointer on this rule. + void DropParentRuleReference() { mParentRule = nullptr; } + + void DropReferences() { + DropSheetReference(); + DropParentRuleReference(); + } + + uint32_t GetLineNumber() const { return mLineNumber; } + uint32_t GetColumnNumber() const { return mColumnNumber; } + + // Whether this a rule in a read only style sheet. + bool IsReadOnly() const; + + // Whether this rule is an @import rule that hasn't loaded yet (and thus + // doesn't affect the style of the page). + bool IsIncompleteImportRule() const; + + // This is pure virtual because all of Rule's data members are non-owning and + // thus measured elsewhere. + virtual size_t SizeOfIncludingThis(MallocSizeOf) const MOZ_MUST_OVERRIDE = 0; + + virtual StyleCssRuleType Type() const = 0; + + // WebIDL interface + uint16_t TypeForBindings() const { + auto type = uint16_t(Type()); + // Per https://drafts.csswg.org/cssom/#dom-cssrule-type for constants > 15 + // we return 0. + return type > 15 ? 0 : type; + } + virtual void GetCssText(nsACString& aCssText) const = 0; + void SetCssText(const nsACString& aCssText); + Rule* GetParentRule() const; + StyleSheet* GetParentStyleSheet() const { return GetStyleSheet(); } + nsINode* GetAssociatedDocumentOrShadowRoot() const { + if (!mSheet) { + return nullptr; + } + auto* associated = mSheet->GetAssociatedDocumentOrShadowRoot(); + return associated ? &associated->AsNode() : nullptr; + } + nsISupports* GetParentObject() const { + return mSheet ? mSheet->GetRelevantGlobal() : nullptr; + } + + protected: + // True if we're known-live for cycle collection purposes. + bool IsKnownLive() const; + + // Hook subclasses can use to properly unlink the nsWrapperCache of + // their declarations. + void UnlinkDeclarationWrapper(nsWrapperCache& aDecl); + + // mSheet should only ever be null when we create a synthetic CSSFontFaceRule + // for an InspectorFontFace. + // + // mSheet and mParentRule will be cleared when they are detached from the + // parent object, either because the rule is removed or the parent is + // destroyed. + StyleSheet* MOZ_NON_OWNING_REF mSheet; + Rule* MOZ_NON_OWNING_REF mParentRule; + + // Keep the same type so that MSVC packs them. + uint32_t mLineNumber; + uint32_t mColumnNumber; +}; + +} // namespace css +} // namespace mozilla + +#endif /* mozilla_css_Rule_h___ */ |