forked from mirrors/gecko-dev
401 lines
14 KiB
C++
401 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* DOM object returned from element.getComputedStyle() */
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#ifndef nsComputedDOMStyle_h__
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#define nsComputedDOMStyle_h__
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#include "mozilla/Attributes.h"
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#include "mozilla/StyleColorInlines.h"
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#include "mozilla/UniquePtr.h"
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#include "nsCOMPtr.h"
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#include "nsContentUtils.h"
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#include "nscore.h"
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#include "nsDOMCSSDeclaration.h"
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#include "mozilla/ComputedStyle.h"
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#include "nsIWeakReferenceUtils.h"
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#include "mozilla/gfx/Types.h"
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#include "nsCoord.h"
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#include "nsColor.h"
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#include "nsStubMutationObserver.h"
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#include "nsStyleStruct.h"
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#include "mozilla/WritingModes.h"
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// XXX Avoid including this here by moving function bodies to the cpp file
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#include "mozilla/dom/Element.h"
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namespace mozilla {
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enum class FlushType : uint8_t;
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enum class PseudoStyleType : uint8_t;
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namespace dom {
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class DocGroup;
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class Element;
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} // namespace dom
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class PresShell;
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struct ComputedGridTrackInfo;
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} // namespace mozilla
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struct ComputedStyleMap;
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struct nsCSSKTableEntry;
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class nsIFrame;
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class nsDOMCSSValueList;
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struct nsMargin;
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class nsROCSSPrimitiveValue;
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class nsStyleGradient;
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class nsComputedDOMStyle final : public nsDOMCSSDeclaration,
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public nsStubMutationObserver {
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private:
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// Convenience typedefs:
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template <typename T>
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using Span = mozilla::Span<T>;
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using KTableEntry = nsCSSKTableEntry;
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using CSSValue = mozilla::dom::CSSValue;
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using StyleGeometryBox = mozilla::StyleGeometryBox;
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using Element = mozilla::dom::Element;
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using Document = mozilla::dom::Document;
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using PseudoStyleType = mozilla::PseudoStyleType;
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using LengthPercentage = mozilla::LengthPercentage;
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using LengthPercentageOrAuto = mozilla::LengthPercentageOrAuto;
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using ComputedStyle = mozilla::ComputedStyle;
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SKIPPABLE_WRAPPERCACHE_CLASS_AMBIGUOUS(
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nsComputedDOMStyle, nsICSSDeclaration)
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NS_DECL_NSIDOMCSSSTYLEDECLARATION_HELPER
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nsresult GetPropertyValue(const nsCSSPropertyID aPropID,
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nsACString& aValue) override;
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void SetPropertyValue(const nsCSSPropertyID aPropID, const nsACString& aValue,
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nsIPrincipal* aSubjectPrincipal,
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mozilla::ErrorResult& aRv) override;
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void IndexedGetter(uint32_t aIndex, bool& aFound,
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nsACString& aPropName) final;
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enum class StyleType : uint8_t {
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DefaultOnly, // Only includes UA and user sheets
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All // Includes all stylesheets
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};
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// In some cases, for legacy reasons, we forcefully return an empty style.
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enum class AlwaysReturnEmptyStyle : bool { No, Yes };
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nsComputedDOMStyle(Element*, PseudoStyleType, Document*, StyleType,
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AlwaysReturnEmptyStyle = AlwaysReturnEmptyStyle::No);
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nsINode* GetAssociatedNode() const override { return mElement; }
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nsINode* GetParentObject() const override { return mElement; }
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static already_AddRefed<const ComputedStyle> GetComputedStyle(
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Element* aElement, PseudoStyleType = PseudoStyleType::NotPseudo,
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StyleType = StyleType::All);
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static already_AddRefed<const ComputedStyle> GetComputedStyleNoFlush(
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const Element* aElement,
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PseudoStyleType aPseudo = PseudoStyleType::NotPseudo,
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StyleType aStyleType = StyleType::All) {
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return DoGetComputedStyleNoFlush(
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aElement, aPseudo, nsContentUtils::GetPresShellForContent(aElement),
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aStyleType);
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}
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static already_AddRefed<const ComputedStyle>
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GetUnanimatedComputedStyleNoFlush(
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Element*, PseudoStyleType = PseudoStyleType::NotPseudo);
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// Helper for nsDOMWindowUtils::GetVisitedDependentComputedStyle
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void SetExposeVisitedStyle(bool aExpose) {
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NS_ASSERTION(aExpose != mExposeVisitedStyle, "should always be changing");
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mExposeVisitedStyle = aExpose;
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}
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void GetCSSImageURLs(const nsACString& aPropertyName,
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nsTArray<nsCString>& aImageURLs,
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mozilla::ErrorResult& aRv) final;
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// nsDOMCSSDeclaration abstract methods which should never be called
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// on a nsComputedDOMStyle object, but must be defined to avoid
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// compile errors.
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mozilla::DeclarationBlock* GetOrCreateCSSDeclaration(
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Operation aOperation, mozilla::DeclarationBlock** aCreated) final;
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virtual nsresult SetCSSDeclaration(mozilla::DeclarationBlock*,
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mozilla::MutationClosureData*) override;
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virtual mozilla::dom::Document* DocToUpdate() override;
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nsDOMCSSDeclaration::ParsingEnvironment GetParsingEnvironment(
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nsIPrincipal* aSubjectPrincipal) const final;
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static already_AddRefed<nsROCSSPrimitiveValue> MatrixToCSSValue(
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const mozilla::gfx::Matrix4x4& aMatrix);
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static void RegisterPrefChangeCallbacks();
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static void UnregisterPrefChangeCallbacks();
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// nsIMutationObserver
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NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED
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private:
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nsresult GetPropertyValue(const nsCSSPropertyID aPropID,
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const nsACString& aMaybeCustomPropertyNme,
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nsACString& aValue);
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virtual ~nsComputedDOMStyle();
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void AssertFlushedPendingReflows() {
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NS_ASSERTION(mFlushedPendingReflows,
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"property getter should have been marked layout-dependent");
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}
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nsMargin GetAdjustedValuesForBoxSizing();
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// This indicates error by leaving mComputedStyle null.
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void UpdateCurrentStyleSources(nsCSSPropertyID);
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void ClearCurrentStyleSources();
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// Helper functions called by UpdateCurrentStyleSources.
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void ClearComputedStyle();
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void SetResolvedComputedStyle(RefPtr<const ComputedStyle>&& aContext,
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uint64_t aGeneration);
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void SetFrameComputedStyle(ComputedStyle* aStyle, uint64_t aGeneration);
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static already_AddRefed<const ComputedStyle> DoGetComputedStyleNoFlush(
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const Element*, PseudoStyleType, mozilla::PresShell*, StyleType);
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#define STYLE_STRUCT(name_) \
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const nsStyle##name_* Style##name_() { \
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return mComputedStyle->Style##name_(); \
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}
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#include "nsStyleStructList.h"
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#undef STYLE_STRUCT
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/**
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* A method to get a percentage base for a percentage value. Returns true
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* if a percentage base value was determined, false otherwise.
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*/
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typedef bool (nsComputedDOMStyle::*PercentageBaseGetter)(nscoord&);
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already_AddRefed<CSSValue> GetOffsetWidthFor(mozilla::Side);
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already_AddRefed<CSSValue> GetAbsoluteOffset(mozilla::Side);
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nscoord GetUsedAbsoluteOffset(mozilla::Side);
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already_AddRefed<CSSValue> GetNonStaticPositionOffset(
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mozilla::Side aSide, bool aResolveAuto, PercentageBaseGetter aWidthGetter,
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PercentageBaseGetter aHeightGetter);
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already_AddRefed<CSSValue> GetStaticOffset(mozilla::Side aSide);
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already_AddRefed<CSSValue> GetPaddingWidthFor(mozilla::Side aSide);
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already_AddRefed<CSSValue> GetBorderWidthFor(mozilla::Side aSide);
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already_AddRefed<CSSValue> GetMarginFor(mozilla::Side aSide);
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already_AddRefed<CSSValue> GetTransformValue(const mozilla::StyleTransform&);
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already_AddRefed<nsROCSSPrimitiveValue> GetGridTrackSize(
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const mozilla::StyleTrackSize&);
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already_AddRefed<nsROCSSPrimitiveValue> GetGridTrackBreadth(
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const mozilla::StyleTrackBreadth&);
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void SetValueToTrackBreadth(nsROCSSPrimitiveValue*,
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const mozilla::StyleTrackBreadth&);
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already_AddRefed<CSSValue> GetGridTemplateColumnsRows(
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const mozilla::StyleGridTemplateComponent& aTrackList,
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const mozilla::ComputedGridTrackInfo& aTrackInfo);
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bool GetLineHeightCoord(nscoord& aCoord);
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bool ShouldHonorMinSizeAutoInAxis(mozilla::PhysicalAxis aAxis);
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/* Properties queryable as CSSValues.
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* To avoid a name conflict with nsIDOM*CSS2Properties, these are all
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* DoGetXXX instead of GetXXX.
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*/
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/* Box properties */
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already_AddRefed<CSSValue> DoGetWidth();
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already_AddRefed<CSSValue> DoGetHeight();
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already_AddRefed<CSSValue> DoGetMaxHeight();
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already_AddRefed<CSSValue> DoGetMaxWidth();
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already_AddRefed<CSSValue> DoGetMinHeight();
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already_AddRefed<CSSValue> DoGetMinWidth();
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already_AddRefed<CSSValue> DoGetLeft();
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already_AddRefed<CSSValue> DoGetTop();
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already_AddRefed<CSSValue> DoGetRight();
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already_AddRefed<CSSValue> DoGetBottom();
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/* Font properties */
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already_AddRefed<CSSValue> DoGetMozOsxFontSmoothing();
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/* Grid properties */
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already_AddRefed<CSSValue> DoGetGridTemplateColumns();
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already_AddRefed<CSSValue> DoGetGridTemplateRows();
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/* StyleImageLayer properties */
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already_AddRefed<CSSValue> DoGetImageLayerPosition(
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const nsStyleImageLayers& aLayers);
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/* Padding properties */
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already_AddRefed<CSSValue> DoGetPaddingTop();
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already_AddRefed<CSSValue> DoGetPaddingBottom();
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already_AddRefed<CSSValue> DoGetPaddingLeft();
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already_AddRefed<CSSValue> DoGetPaddingRight();
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/* Table Properties */
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already_AddRefed<CSSValue> DoGetBorderSpacing();
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/* Border Properties */
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already_AddRefed<CSSValue> DoGetBorderTopWidth();
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already_AddRefed<CSSValue> DoGetBorderBottomWidth();
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already_AddRefed<CSSValue> DoGetBorderLeftWidth();
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already_AddRefed<CSSValue> DoGetBorderRightWidth();
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/* Margin Properties */
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already_AddRefed<CSSValue> DoGetMarginTop();
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already_AddRefed<CSSValue> DoGetMarginBottom();
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already_AddRefed<CSSValue> DoGetMarginLeft();
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already_AddRefed<CSSValue> DoGetMarginRight();
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/* Text Properties */
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already_AddRefed<CSSValue> DoGetLineHeight();
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/* Display properties */
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already_AddRefed<CSSValue> DoGetTransform();
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already_AddRefed<CSSValue> DoGetTransformOrigin();
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already_AddRefed<CSSValue> DoGetPerspectiveOrigin();
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/* Column properties */
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already_AddRefed<CSSValue> DoGetColumnRuleWidth();
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// For working around a MSVC bug. See related comment in
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// GenerateComputedDOMStyleGenerated.py.
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already_AddRefed<CSSValue> DummyGetter();
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/* Helper functions */
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void SetValueToPosition(const mozilla::Position& aPosition,
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nsDOMCSSValueList* aValueList);
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void SetValueToURLValue(const mozilla::StyleComputedUrl* aURL,
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nsROCSSPrimitiveValue* aValue);
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void SetValueFromFitContentFunction(nsROCSSPrimitiveValue* aValue,
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const mozilla::LengthPercentage&);
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void SetValueToSize(nsROCSSPrimitiveValue* aValue, const mozilla::StyleSize&);
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void SetValueToLengthPercentageOrAuto(nsROCSSPrimitiveValue* aValue,
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const LengthPercentageOrAuto&,
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bool aClampNegativeCalc);
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void SetValueToLengthPercentage(nsROCSSPrimitiveValue* aValue,
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const LengthPercentage&,
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bool aClampNegativeCalc);
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void SetValueToMaxSize(nsROCSSPrimitiveValue* aValue,
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const mozilla::StyleMaxSize&);
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bool GetCBContentWidth(nscoord& aWidth);
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bool GetCBContentHeight(nscoord& aHeight);
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bool GetCBPaddingRectWidth(nscoord& aWidth);
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bool GetCBPaddingRectHeight(nscoord& aHeight);
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bool GetScrollFrameContentWidth(nscoord& aWidth);
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bool GetScrollFrameContentHeight(nscoord& aHeight);
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bool GetFrameBorderRectWidth(nscoord& aWidth);
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bool GetFrameBorderRectHeight(nscoord& aHeight);
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// Find out if we can safely skip flushing (i.e. pending restyles do not
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// affect our element).
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bool NeedsToFlushStyle(nsCSSPropertyID) const;
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// Find out if we need to flush layout of the document, depending on the
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// property that was requested.
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bool NeedsToFlushLayout(nsCSSPropertyID) const;
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// Flushes the given document, which must be our document, and potentially the
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// mElement's document.
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void Flush(Document&, mozilla::FlushType);
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nsIFrame* GetOuterFrame() const;
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static ComputedStyleMap* GetComputedStyleMap();
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// We don't really have a good immutable representation of "presentation".
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// Given the way GetComputedStyle is currently used, we should just grab the
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// presshell, if any, from the document.
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nsWeakPtr mDocumentWeak;
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RefPtr<Element> mElement;
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/**
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* Strong reference to the ComputedStyle we access data from. This can be
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* either a ComputedStyle we resolved ourselves or a ComputedStyle we got
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* from our frame.
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*
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* If we got the ComputedStyle from the frame, we clear out mComputedStyle
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* in ClearCurrentStyleSources. If we resolved one ourselves, then
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* ClearCurrentStyleSources leaves it in mComputedStyle for use the next
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* time this nsComputedDOMStyle object is queried. UpdateCurrentStyleSources
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* in this case will check that the ComputedStyle is still valid to be used,
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* by checking whether flush styles results in any restyles having been
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* processed.
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*/
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RefPtr<const ComputedStyle> mComputedStyle;
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/*
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* While computing style data, the primary frame for mContent --- named
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* "outer" because we should use it to compute positioning data. Null
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* otherwise.
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*/
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nsIFrame* mOuterFrame;
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/*
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* While computing style data, the "inner frame" for mContent --- the frame
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* which we should use to compute margin, border, padding and content data.
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* Null otherwise.
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*/
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nsIFrame* mInnerFrame;
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/*
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* While computing style data, the presshell we're working with. Null
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* otherwise.
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*/
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mozilla::PresShell* mPresShell;
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PseudoStyleType mPseudo;
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/* The kind of styles we should be returning. */
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StyleType mStyleType;
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/* Whether for legacy reasons we return an empty style (when an unknown
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* pseudo-element is specified) */
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AlwaysReturnEmptyStyle mAlwaysReturnEmpty;
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/**
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* The nsComputedDOMStyle generation at the time we last resolved a style
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* context and stored it in mComputedStyle, and the pres shell we got the
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* style from. Should only be used together.
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*/
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uint64_t mComputedStyleGeneration = 0;
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uint32_t mPresShellId = 0;
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bool mExposeVisitedStyle = false;
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/**
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* Whether we resolved a ComputedStyle last time we called
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* UpdateCurrentStyleSources. Initially false.
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*/
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bool mResolvedComputedStyle = false;
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#ifdef DEBUG
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bool mFlushedPendingReflows = false;
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#endif
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friend struct ComputedStyleMap;
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};
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already_AddRefed<nsComputedDOMStyle> NS_NewComputedDOMStyle(
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mozilla::dom::Element*, const nsAString& aPseudoElt,
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mozilla::dom::Document*, nsComputedDOMStyle::StyleType,
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mozilla::ErrorResult&);
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#endif /* nsComputedDOMStyle_h__ */
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