зеркало из https://github.com/mozilla/gecko-dev.git
141 строка
4.9 KiB
C++
141 строка
4.9 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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/*
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* A base class which implements nsIStyleSheetLinkingElement and can
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* be subclassed by various content nodes that want to load
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* stylesheets (<style>, <link>, processing instructions, etc).
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*/
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#ifndef nsStyleLinkElement_h___
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#define nsStyleLinkElement_h___
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#include "mozilla/Attributes.h"
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#include "mozilla/CORSMode.h"
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#include "mozilla/StyleSheetInlines.h"
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#include "mozilla/Unused.h"
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#include "nsCOMPtr.h"
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#include "nsIStyleSheetLinkingElement.h"
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#include "nsTArray.h"
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class nsIURI;
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namespace mozilla {
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class CSSStyleSheet;
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namespace dom {
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class Document;
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class ShadowRoot;
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} // namespace dom
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} // namespace mozilla
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class nsStyleLinkElement : public nsIStyleSheetLinkingElement {
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public:
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nsStyleLinkElement();
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virtual ~nsStyleLinkElement();
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override = 0;
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mozilla::StyleSheet* GetSheet() const { return mStyleSheet; }
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// nsIStyleSheetLinkingElement
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void SetStyleSheet(mozilla::StyleSheet* aStyleSheet) override;
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mozilla::StyleSheet* GetStyleSheet() override;
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void InitStyleLinkElement(bool aDontLoadStyle) override;
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mozilla::Result<Update, nsresult> UpdateStyleSheet(
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nsICSSLoaderObserver*) override;
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void SetEnableUpdates(bool aEnableUpdates) override;
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void GetCharset(nsAString& aCharset) override;
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void OverrideBaseURI(nsIURI* aNewBaseURI) override;
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void SetLineNumber(uint32_t aLineNumber) override;
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uint32_t GetLineNumber() override;
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void SetColumnNumber(uint32_t aColumnNumber) override;
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uint32_t GetColumnNumber() override;
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enum RelValue {
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ePREFETCH = 0x00000001,
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eDNS_PREFETCH = 0x00000002,
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eSTYLESHEET = 0x00000004,
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eNEXT = 0x00000008,
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eALTERNATE = 0x00000010,
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ePRECONNECT = 0x00000020,
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// NOTE: 0x40 is unused
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ePRELOAD = 0x00000080
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};
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// The return value is a bitwise or of 0 or more RelValues.
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static uint32_t ParseLinkTypes(const nsAString& aTypes);
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void UpdateStyleSheetInternal() {
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mozilla::Unused << UpdateStyleSheetInternal(nullptr, nullptr);
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}
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protected:
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/**
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* @param aOldDocument should be non-null only if we're updating because we
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* removed the node from the document.
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* @param aOldShadowRoot should be non-null only if we're updating because we
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* removed the node from a shadow tree.
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* @param aForceUpdate true will force the update even if the URI has not
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* changed. This should be used in cases when something
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* about the content that affects the resulting sheet
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* changed but the URI may not have changed.
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*
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* TODO(emilio): Should probably pass a single DocumentOrShadowRoot.
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*/
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mozilla::Result<Update, nsresult> UpdateStyleSheetInternal(
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mozilla::dom::Document* aOldDocument,
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mozilla::dom::ShadowRoot* aOldShadowRoot, ForceUpdate = ForceUpdate::No);
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// Gets a suitable title and media for SheetInfo out of an element, which
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// needs to be `this`.
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//
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// NOTE(emilio): Needs nsString instead of nsAString because of
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// CompressWhitespace.
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static void GetTitleAndMediaForElement(const mozilla::dom::Element&,
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nsString& aTitle, nsString& aMedia);
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// Returns whether the type attribute specifies the text/css mime type.
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static bool IsCSSMimeTypeAttribute(const mozilla::dom::Element&);
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virtual mozilla::Maybe<SheetInfo> GetStyleSheetInfo() = 0;
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// CC methods
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void Unlink();
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void Traverse(nsCycleCollectionTraversalCallback& cb);
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private:
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/**
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* @param aOldDocument should be non-null only if we're updating because we
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* removed the node from the document.
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* @param aOldShadowRoot The ShadowRoot that used to contain the style.
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* Passed as a parameter because on an update, the node
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* is removed from the tree before the sheet is removed
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* from the ShadowRoot.
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* @param aForceUpdate true will force the update even if the URI has not
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* changed. This should be used in cases when something
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* about the content that affects the resulting sheet
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* changed but the URI may not have changed.
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*/
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mozilla::Result<Update, nsresult> DoUpdateStyleSheet(
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mozilla::dom::Document* aOldDocument,
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mozilla::dom::ShadowRoot* aOldShadowRoot, nsICSSLoaderObserver* aObserver,
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ForceUpdate);
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RefPtr<mozilla::StyleSheet> mStyleSheet;
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protected:
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nsCOMPtr<nsIPrincipal> mTriggeringPrincipal;
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bool mDontLoadStyle;
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bool mUpdatesEnabled;
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uint32_t mLineNumber;
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uint32_t mColumnNumber;
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};
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#endif /* nsStyleLinkElement_h___ */
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