зеркало из https://github.com/mozilla/gecko-dev.git
453 строки
17 KiB
C++
453 строки
17 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 "mozilla/dom/Element.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 "nsStyleStruct.h"
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#include "mozilla/WritingModes.h"
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namespace mozilla {
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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 nsStyleCoord;
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struct nsStyleFilter;
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class nsStyleGradient;
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struct nsStyleImage;
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class nsStyleSides;
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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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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 StyleFlexBasis = mozilla::StyleFlexBasis;
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using StyleSize = mozilla::StyleSize;
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using StyleMaxSize = mozilla::StyleMaxSize;
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using LengthPercentage = mozilla::LengthPercentage;
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using LengthPercentageOrAuto = mozilla::LengthPercentageOrAuto;
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using StyleExtremumLength = mozilla::StyleExtremumLength;
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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_SCRIPT_HOLDER_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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nsAString& aValue) override;
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nsresult SetPropertyValue(const nsCSSPropertyID aPropID,
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const nsAString& aValue,
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nsIPrincipal* aSubjectPrincipal) override;
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void IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aPropName) final;
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enum StyleType {
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eDefaultOnly, // Only includes UA and user sheets
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eAll // Includes all stylesheets
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};
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nsComputedDOMStyle(Element* aElement, const nsAString& aPseudoElt,
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Document* aDocument, StyleType aStyleType);
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nsINode* GetParentObject() override { return mElement; }
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static already_AddRefed<ComputedStyle> GetComputedStyle(
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Element* aElement, nsAtom* aPseudo, StyleType aStyleType = eAll);
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static already_AddRefed<ComputedStyle> GetComputedStyleNoFlush(
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Element* aElement, nsAtom* aPseudo, StyleType aStyleType = eAll) {
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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<ComputedStyle> GetUnanimatedComputedStyleNoFlush(
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Element* aElement, nsAtom* aPseudo);
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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 nsAString& aPropertyName,
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nsTArray<nsString>& 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 SetToRGBAColor(nsROCSSPrimitiveValue* aValue, nscolor aColor);
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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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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(bool aNeedsLayoutFlush);
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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<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<ComputedStyle> DoGetComputedStyleNoFlush(
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Element* aElement, nsAtom* aPseudo, mozilla::PresShell* aPresShell,
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StyleType aStyleType);
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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> GetBorderStyleFor(mozilla::Side aSide);
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already_AddRefed<CSSValue> GetBorderWidthFor(mozilla::Side aSide);
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already_AddRefed<CSSValue> GetBorderColorFor(mozilla::Side aSide);
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already_AddRefed<CSSValue> GetMarginWidthFor(mozilla::Side aSide);
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already_AddRefed<CSSValue> GetTransformValue(
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nsCSSValueSharedList* aSpecifiedTransform);
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// Appends all aLineNames (may be empty) space-separated to aResult.
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void AppendGridLineNames(nsString& aResult,
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const nsTArray<nsString>& aLineNames);
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// Appends aLineNames as a CSSValue* to aValueList. If aLineNames is empty
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// a value ("[]") is only appended if aSuppressEmptyList is false.
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void AppendGridLineNames(nsDOMCSSValueList* aValueList,
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const nsTArray<nsString>& aLineNames,
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bool aSuppressEmptyList = true);
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// Appends aLineNames1/2 (if non-empty) as a CSSValue* to aValueList.
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void AppendGridLineNames(nsDOMCSSValueList* aValueList,
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const nsTArray<nsString>& aLineNames1,
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const nsTArray<nsString>& aLineNames2);
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already_AddRefed<CSSValue> GetGridTrackSize(const nsStyleCoord& aMinSize,
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const nsStyleCoord& aMaxSize);
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already_AddRefed<CSSValue> GetGridTemplateColumnsRows(
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const nsStyleGridTemplate& aTrackList,
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const mozilla::ComputedGridTrackInfo* aTrackInfo);
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already_AddRefed<CSSValue> GetGridLine(const nsStyleGridLine& aGridLine);
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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> DoGetOsxFontSmoothing();
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/* Grid properties */
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already_AddRefed<CSSValue> DoGetGridAutoColumns();
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already_AddRefed<CSSValue> DoGetGridAutoRows();
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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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/* Mask properties */
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already_AddRefed<CSSValue> DoGetMask();
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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> DoGetMarginTopWidth();
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already_AddRefed<CSSValue> DoGetMarginBottomWidth();
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already_AddRefed<CSSValue> DoGetMarginLeftWidth();
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already_AddRefed<CSSValue> DoGetMarginRightWidth();
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/* Text Properties */
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already_AddRefed<CSSValue> DoGetLineHeight();
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already_AddRefed<CSSValue> DoGetTextDecoration();
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already_AddRefed<CSSValue> DoGetTextDecorationColor();
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already_AddRefed<CSSValue> DoGetTextDecorationStyle();
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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 SetValueFromComplexColor(nsROCSSPrimitiveValue* aValue,
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const mozilla::StyleColor& aColor);
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void SetValueToPosition(const mozilla::Position& aPosition,
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nsDOMCSSValueList* aValueList);
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void SetValueToURLValue(const mozilla::css::URLValue* aURL,
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nsROCSSPrimitiveValue* aValue);
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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, const StyleMaxSize&);
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void SetValueToExtremumLength(nsROCSSPrimitiveValue* aValue,
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StyleExtremumLength);
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/**
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* Method to set aValue to aCoord. If aCoord is a percentage value and
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* aPercentageBaseGetter is not null, aPercentageBaseGetter is called. If it
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* returns true, the percentage base it outputs in its out param is used
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* to compute an nscoord value. If the getter is null or returns false,
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* the percent value of aCoord is set as a percent value on aValue. aTable,
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* if not null, is the keyword table to handle eStyleUnit_Enumerated. When
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* calling SetAppUnits on aValue (for coord or percent values), the value
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* passed in will be clamped to be no less than aMinAppUnits and no more than
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* aMaxAppUnits.
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*
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* XXXbz should caller pass in some sort of bitfield indicating which units
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* can be expected or something?
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*/
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void SetValueToCoord(nsROCSSPrimitiveValue* aValue,
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const nsStyleCoord& aCoord, bool aClampNegativeCalc,
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PercentageBaseGetter aPercentageBaseGetter = nullptr,
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const KTableEntry aTable[] = nullptr);
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/**
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* If aCoord is a eStyleUnit_Coord returns the nscoord. If it's
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* eStyleUnit_Percent, attempts to resolve the percentage base and returns
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* the resulting nscoord. If it's some other unit or a percentage base can't
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* be determined, returns aDefaultValue.
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*/
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nscoord StyleCoordToNSCoord(const LengthPercentage& aCoord,
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PercentageBaseGetter aPercentageBaseGetter,
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nscoord aDefaultValue, bool aClampNegativeCalc);
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template <typename LengthPercentageLike>
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nscoord StyleCoordToNSCoord(const LengthPercentageLike& aCoord,
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PercentageBaseGetter aPercentageBaseGetter,
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nscoord aDefaultValue, bool aClampNegativeCalc) {
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if (aCoord.IsLengthPercentage()) {
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return StyleCoordToNSCoord(aCoord.AsLengthPercentage(),
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aPercentageBaseGetter, aDefaultValue,
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aClampNegativeCalc);
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}
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return aDefaultValue;
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}
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/**
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* Append coord values from four sides. It omits values when possible.
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*/
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void AppendFourSideCoordValues(nsDOMCSSValueList* aList,
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const nsStyleSides& aValues);
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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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/* Helper functions for computing and serializing a nsStyleCoord. */
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void SetCssTextToCoord(nsAString& aCssText, const nsStyleCoord& aCoord,
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bool aClampNegativeCalc);
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// Find out if we can safely skip flushing (i.e. pending restyles do not
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// affect mElement).
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bool NeedsToFlush() 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<ComputedStyle> mComputedStyle;
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RefPtr<nsAtom> mPseudo;
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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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/*
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* The kind of styles we should be returning.
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*/
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StyleType mStyleType;
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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;
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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;
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#ifdef DEBUG
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bool mFlushedPendingReflows;
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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* aElement, const nsAString& aPseudoElt,
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mozilla::dom::Document* aDocument,
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nsComputedDOMStyle::StyleType aStyleType = nsComputedDOMStyle::eAll);
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#endif /* nsComputedDOMStyle_h__ */
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