The Tor Browser: content/base/src/nsStyleLinkElement.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  *

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 /*

     8  * A base class which implements nsIStyleSheetLinkingElement and can

     9  * be subclassed by various content nodes that want to load

    10  * stylesheets (<style>, <link>, processing instructions, etc).

    11  */

    13 #ifndef nsStyleLinkElement_h___

    14 #define nsStyleLinkElement_h___

    16 #include "mozilla/Attributes.h"

    17 #include "nsCOMPtr.h"

    18 #include "nsIStyleSheetLinkingElement.h"

    19 #include "nsCSSStyleSheet.h"

    20 #include "nsTArray.h"

    21 #include "mozilla/CORSMode.h"

    23 class nsIDocument;

    24 class nsIURI;

    26 namespace mozilla {

    27 namespace dom {

    28 class ShadowRoot;

    29 } // namespace dom

    30 } // namespace mozilla

    32 class nsStyleLinkElement : public nsIStyleSheetLinkingElement

    33 {

    34 public:

    35   nsStyleLinkElement();

    36   virtual ~nsStyleLinkElement();

    38   NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) MOZ_OVERRIDE = 0;

    40   nsCSSStyleSheet* GetSheet() const { return mStyleSheet; }

    42   // nsIStyleSheetLinkingElement

    43   NS_IMETHOD SetStyleSheet(nsCSSStyleSheet* aStyleSheet) MOZ_OVERRIDE;

    44   NS_IMETHOD GetStyleSheet(nsIStyleSheet*& aStyleSheet) MOZ_OVERRIDE;

    45   NS_IMETHOD InitStyleLinkElement(bool aDontLoadStyle) MOZ_OVERRIDE;

    46   NS_IMETHOD UpdateStyleSheet(nsICSSLoaderObserver* aObserver,

    47                               bool* aWillNotify,

    48                               bool* aIsAlternate) MOZ_OVERRIDE;

    49   NS_IMETHOD SetEnableUpdates(bool aEnableUpdates) MOZ_OVERRIDE;

    50   NS_IMETHOD GetCharset(nsAString& aCharset) MOZ_OVERRIDE;

    52   virtual void OverrideBaseURI(nsIURI* aNewBaseURI) MOZ_OVERRIDE;

    53   virtual void SetLineNumber(uint32_t aLineNumber) MOZ_OVERRIDE;

    55   enum RelValue {

    56     ePREFETCH =     0x00000001,

    57     eDNS_PREFETCH = 0x00000002,

    58     eSTYLESHEET =   0x00000004,

    59     eNEXT =         0x00000008,

    60     eALTERNATE =    0x00000010,

    61   };

    63   // The return value is a bitwise or of 0 or more RelValues

    64   static uint32_t ParseLinkTypes(const nsAString& aTypes);

    66   void UpdateStyleSheetInternal()

    67   {

    68     UpdateStyleSheetInternal(nullptr, nullptr);

    69   }

    70 protected:

    71   /**

    72    * @param aOldDocument should be non-null only if we're updating because we

    73    *                     removed the node from the document.

    74    * @param aForceUpdate true will force the update even if the URI has not

    75    *                     changed.  This should be used in cases when something

    76    *                     about the content that affects the resulting sheet

    77    *                     changed but the URI may not have changed.

    78    */

    79   nsresult UpdateStyleSheetInternal(nsIDocument *aOldDocument,

    80                                     mozilla::dom::ShadowRoot *aOldShadowRoot,

    81                                     bool aForceUpdate = false);

    83   void UpdateStyleSheetScopedness(bool aIsNowScoped);

    85   virtual already_AddRefed<nsIURI> GetStyleSheetURL(bool* aIsInline) = 0;

    86   virtual void GetStyleSheetInfo(nsAString& aTitle,

    87                                  nsAString& aType,

    88                                  nsAString& aMedia,

    89                                  bool* aIsScoped,

    90                                  bool* aIsAlternate) = 0;

    92   virtual mozilla::CORSMode GetCORSMode() const

    93   {

    94     // Default to no CORS

    95     return mozilla::CORS_NONE;

    96   }

    98   // CC methods

    99   void Unlink();

   100   void Traverse(nsCycleCollectionTraversalCallback &cb);

   102 private:

   103   /**

   104    * @param aOldDocument should be non-null only if we're updating because we

   105    *                     removed the node from the document.

   106    * @param aOldShadowRoot The ShadowRoot that used to contain the style.

   107    *                     Passed as a parameter because on an update, the node

   108    *                     is removed from the tree before the sheet is removed

   109    *                     from the ShadowRoot.

   110    * @param aForceUpdate true will force the update even if the URI has not

   111    *                     changed.  This should be used in cases when something

   112    *                     about the content that affects the resulting sheet

   113    *                     changed but the URI may not have changed.

   114    */

   115   nsresult DoUpdateStyleSheet(nsIDocument* aOldDocument,

   116                               mozilla::dom::ShadowRoot* aOldShadowRoot,

   117                               nsICSSLoaderObserver* aObserver,

   118                               bool* aWillNotify,

   119                               bool* aIsAlternate,

   120                               bool aForceUpdate);

   122   nsRefPtr<nsCSSStyleSheet> mStyleSheet;

   123 protected:

   124   bool mDontLoadStyle;

   125   bool mUpdatesEnabled;

   126   uint32_t mLineNumber;

   127 };

   129 #endif /* nsStyleLinkElement_h___ */

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