dom/base/Link.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   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/. */
   6
   7 /**
   8  * This is the base class for all link classes.
   9  */
  10
  11 #ifndef mozilla_dom_Link_h__
  12 #define mozilla_dom_Link_h__
  13
  14 #include "nsWrapperCache.h"  // For nsWrapperCache::FlagsType
  15 #include "nsCOMPtr.h"
  16 #include "mozilla/dom/RustTypes.h"
  17
  18 class nsIURI;
  19
  20 namespace mozilla {
  21
  22 class SizeOfState;
  23
  24 namespace dom {
  25
  26 class Document;
  27 class Element;
  28 struct BindContext;
  29
  30 #define MOZILLA_DOM_LINK_IMPLEMENTATION_IID          \
  31   {                                                  \
  32     0xb25edee6, 0xdd35, 0x4f8b, {                    \
  33       0xab, 0x90, 0x66, 0xd0, 0xbd, 0x3c, 0x22, 0xd5 \
  34     }                                                \
  35   }
  36
  37 class Link : public nsISupports {
  38  public:
  39   NS_DECLARE_STATIC_IID_ACCESSOR(MOZILLA_DOM_LINK_IMPLEMENTATION_IID)
  40
  41   enum class State : uint8_t {
  42     Unvisited = 0,
  43     Visited,
  44     NotLink,
  45   };
  46
  47   /**
  48    * aElement is the element pointer corresponding to this link.
  49    */
  50   explicit Link(Element* aElement);
  51
  52   /**
  53    * This constructor is only used for testing.
  54    */
  55   explicit Link();
  56
  57   virtual void VisitedQueryFinished(bool aVisited);
  58
  59   /**
  60    * @return the URI this link is for, if available.
  61    */
  62   nsIURI* GetURI() const;
  63
  64   /**
  65    * Helper methods for modifying and obtaining parts of the URI of the Link.
  66    */
  67   void SetProtocol(const nsACString& aProtocol);
  68   void SetUsername(const nsACString& aUsername);
  69   void SetPassword(const nsACString& aPassword);
  70   void SetHost(const nsACString& aHost);
  71   void SetHostname(const nsACString& aHostname);
  72   void SetPathname(const nsACString& aPathname);
  73   void SetSearch(const nsACString& aSearch);
  74   void SetPort(const nsACString& aPort);
  75   void SetHash(const nsACString& aHash);
  76   void GetOrigin(nsACString& aOrigin);
  77   void GetProtocol(nsACString& aProtocol);
  78   void GetUsername(nsACString& aUsername);
  79   void GetPassword(nsACString& aPassword);
  80   void GetHost(nsACString& aHost);
  81   void GetHostname(nsACString& aHostname);
  82   void GetPathname(nsACString& aPathname);
  83   void GetSearch(nsACString& aSearch);
  84   void GetPort(nsACString& aPort);
  85   void GetHash(nsACString& aHash);
  86
  87   /**
  88    * Invalidates any link caching, and resets the state to the default.
  89    *
  90    * @param aNotify
  91    *        true if ResetLinkState should notify the owning document about style
  92    *        changes or false if it should not.
  93    */
  94   void ResetLinkState(bool aNotify, bool aHasHref);
  95   void ResetLinkState(bool aNotify) {
  96     ResetLinkState(aNotify, ElementHasHref());
  97   }
  98   void BindToTree(const BindContext&);
  99   void UnbindFromTree() { ResetLinkState(false); }
 100
 101   // This method nevers returns a null element.
 102   Element* GetElement() const { return mElement; }
 103
 104   virtual size_t SizeOfExcludingThis(mozilla::SizeOfState& aState) const;
 105
 106   virtual bool ElementHasHref() const;
 107
 108   bool HasPendingLinkUpdate() const { return mHasPendingLinkUpdate; }
 109   void SetHasPendingLinkUpdate() { mHasPendingLinkUpdate = true; }
 110   void ClearHasPendingLinkUpdate() { mHasPendingLinkUpdate = false; }
 111   void TriggerLinkUpdate(bool aNotify);
 112
 113   // To ensure correct mHasPendingLinkUpdate handling, we have this method
 114   // similar to the one in Element. Overriders must call
 115   // ClearHasPendingLinkUpdate().
 116   // If you change this, change also the method in nsINode.
 117   virtual void NodeInfoChanged(Document* aOldDoc) = 0;
 118
 119  protected:
 120   virtual ~Link();
 121
 122   nsIURI* GetCachedURI() const { return mCachedURI; }
 123   bool HasCachedURI() const { return !!mCachedURI; }
 124
 125  private:
 126   /**
 127    * Unregisters from History and the document so this node no longer gets
 128    * notifications about changes to visitedness.
 129    */
 130   void Unregister();
 131   void SetLinkState(State, bool aNotify);
 132   void SetHrefAttribute(nsIURI* aURI);
 133
 134   mutable nsCOMPtr<nsIURI> mCachedURI;
 135
 136   Element* const mElement;
 137
 138   bool mNeedsRegistration : 1;
 139   bool mRegistered : 1;
 140   bool mHasPendingLinkUpdate : 1;
 141   const bool mHistory : 1;
 142 };
 143
 144 NS_DEFINE_STATIC_IID_ACCESSOR(Link, MOZILLA_DOM_LINK_IMPLEMENTATION_IID)
 145
 146 }  // namespace dom
 147 }  // namespace mozilla
 148
 149 #endif  // mozilla_dom_Link_h__