147 lines
5.1 KiB
C++
147 lines
5.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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/net/ReferrerPolicy.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 nsIDocument;
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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 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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{
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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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NS_IMETHOD SetStyleSheet(mozilla::StyleSheet* aStyleSheet) override;
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NS_IMETHOD_(mozilla::StyleSheet*) GetStyleSheet() override;
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NS_IMETHOD InitStyleLinkElement(bool aDontLoadStyle) override;
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NS_IMETHOD UpdateStyleSheet(nsICSSLoaderObserver* aObserver,
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bool* aWillNotify,
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bool* aIsAlternate,
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bool aForceReload) override;
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NS_IMETHOD SetEnableUpdates(bool aEnableUpdates) override;
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NS_IMETHOD GetCharset(nsAString& aCharset) override;
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virtual void OverrideBaseURI(nsIURI* aNewBaseURI) override;
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virtual void SetLineNumber(uint32_t aLineNumber) override;
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virtual uint32_t GetLineNumber() 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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eHTMLIMPORT = 0x00000020,
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ePRECONNECT = 0x00000040
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};
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// The return value is a bitwise or of 0 or more RelValues.
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// aPrincipal is used to check if HTML imports is enabled for the
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// provided principal.
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static uint32_t ParseLinkTypes(const nsAString& aTypes,
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nsIPrincipal* aPrincipal);
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static bool IsImportEnabled();
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void UpdateStyleSheetInternal()
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{
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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 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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nsresult UpdateStyleSheetInternal(nsIDocument *aOldDocument,
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mozilla::dom::ShadowRoot *aOldShadowRoot,
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bool aForceUpdate = false);
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void UpdateStyleSheetScopedness(bool aIsNowScoped);
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virtual already_AddRefed<nsIURI> GetStyleSheetURL(bool* aIsInline) = 0;
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virtual void GetStyleSheetInfo(nsAString& aTitle,
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nsAString& aType,
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nsAString& aMedia,
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bool* aIsScoped,
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bool* aIsAlternate,
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bool* aIsExplicitlyEnabled) = 0;
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virtual mozilla::CORSMode GetCORSMode() const
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{
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// Default to no CORS
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return mozilla::CORS_NONE;
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}
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virtual mozilla::net::ReferrerPolicy GetLinkReferrerPolicy()
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{
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return mozilla::net::RP_Unset;
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}
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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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nsresult DoUpdateStyleSheet(nsIDocument* aOldDocument,
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mozilla::dom::ShadowRoot* aOldShadowRoot,
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nsICSSLoaderObserver* aObserver,
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bool* aWillNotify,
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bool* aIsAlternate,
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bool aForceUpdate);
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RefPtr<mozilla::StyleSheet> mStyleSheet;
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protected:
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bool mDontLoadStyle;
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bool mUpdatesEnabled;
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uint32_t mLineNumber;
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};
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#endif /* nsStyleLinkElement_h___ */
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