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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/*
* A base class which implements nsIStyleSheetLinkingElement and can
* be subclassed by various content nodes that want to load
* stylesheets (<style>, <link>, processing instructions, etc).
*/
#ifndef nsStyleLinkElement_h___
#define nsStyleLinkElement_h___
#include "mozilla/Attributes.h"
#include "mozilla/CORSMode.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/net/ReferrerPolicy.h"
#include "nsCOMPtr.h"
#include "nsIStyleSheetLinkingElement.h"
#include "nsTArray.h"
class nsIDocument;
class nsIURI;
namespace mozilla {
class CSSStyleSheet;
namespace dom {
class ShadowRoot;
} // namespace dom
} // namespace mozilla
class nsStyleLinkElement : public nsIStyleSheetLinkingElement
{
public:
nsStyleLinkElement();
virtual ~nsStyleLinkElement();
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override = 0;
mozilla::StyleSheet* GetSheet() const { return mStyleSheet; }
// nsIStyleSheetLinkingElement
NS_IMETHOD SetStyleSheet(mozilla::StyleSheet* aStyleSheet) override;
NS_IMETHOD_(mozilla::StyleSheet*) GetStyleSheet() override;
NS_IMETHOD InitStyleLinkElement(bool aDontLoadStyle) override;
NS_IMETHOD UpdateStyleSheet(nsICSSLoaderObserver* aObserver,
bool* aWillNotify,
bool* aIsAlternate,
bool aForceReload) override;
NS_IMETHOD SetEnableUpdates(bool aEnableUpdates) override;
NS_IMETHOD GetCharset(nsAString& aCharset) override;
virtual void OverrideBaseURI(nsIURI* aNewBaseURI) override;
virtual void SetLineNumber(uint32_t aLineNumber) override;
virtual uint32_t GetLineNumber() override;
enum RelValue {
ePREFETCH = 0x00000001,
eDNS_PREFETCH = 0x00000002,
eSTYLESHEET = 0x00000004,
eNEXT = 0x00000008,
eALTERNATE = 0x00000010,
eHTMLIMPORT = 0x00000020,
ePRECONNECT = 0x00000040
};
// The return value is a bitwise or of 0 or more RelValues.
// aPrincipal is used to check if HTML imports is enabled for the
// provided principal.
static uint32_t ParseLinkTypes(const nsAString& aTypes,
nsIPrincipal* aPrincipal);
static bool IsImportEnabled();
void UpdateStyleSheetInternal()
{
UpdateStyleSheetInternal(nullptr, nullptr);
}
protected:
/**
* @param aOldDocument should be non-null only if we're updating because we
* removed the node from the document.
* @param aForceUpdate true will force the update even if the URI has not
* changed. This should be used in cases when something
* about the content that affects the resulting sheet
* changed but the URI may not have changed.
*/
nsresult UpdateStyleSheetInternal(nsIDocument *aOldDocument,
mozilla::dom::ShadowRoot *aOldShadowRoot,
bool aForceUpdate = false);
void UpdateStyleSheetScopedness(bool aIsNowScoped);
virtual already_AddRefed<nsIURI> GetStyleSheetURL(bool* aIsInline) = 0;
virtual void GetStyleSheetInfo(nsAString& aTitle,
nsAString& aType,
nsAString& aMedia,
bool* aIsScoped,
bool* aIsAlternate,
bool* aIsExplicitlyEnabled) = 0;
virtual mozilla::CORSMode GetCORSMode() const
{
// Default to no CORS
return mozilla::CORS_NONE;
}
virtual mozilla::net::ReferrerPolicy GetLinkReferrerPolicy()
{
return mozilla::net::RP_Unset;
}
// CC methods
void Unlink();
void Traverse(nsCycleCollectionTraversalCallback &cb);
private:
/**
* @param aOldDocument should be non-null only if we're updating because we
* removed the node from the document.
* @param aOldShadowRoot The ShadowRoot that used to contain the style.
* Passed as a parameter because on an update, the node
* is removed from the tree before the sheet is removed
* from the ShadowRoot.
* @param aForceUpdate true will force the update even if the URI has not
* changed. This should be used in cases when something
* about the content that affects the resulting sheet
* changed but the URI may not have changed.
*/
nsresult DoUpdateStyleSheet(nsIDocument* aOldDocument,
mozilla::dom::ShadowRoot* aOldShadowRoot,
nsICSSLoaderObserver* aObserver,
bool* aWillNotify,
bool* aIsAlternate,
bool aForceUpdate);
RefPtr<mozilla::StyleSheet> mStyleSheet;
protected:
bool mDontLoadStyle;
bool mUpdatesEnabled;
uint32_t mLineNumber;
};
#endif /* nsStyleLinkElement_h___ */
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