content/browser/frame_host/frame_tree_node.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_
   6 #define CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/memory/scoped_vector.h"
  14 #include "content/browser/frame_host/render_frame_host_impl.h"
  15 #include "content/browser/frame_host/render_frame_host_manager.h"
  16 #include "content/common/content_export.h"
  17 #include "url/gurl.h"
  18
  19 namespace content {
  20
  21 class FrameTree;
  22 class Navigator;
  23 class RenderFrameHostImpl;
  24
  25 // When a page contains iframes, its renderer process maintains a tree structure
  26 // of those frames. We are mirroring this tree in the browser process. This
  27 // class represents a node in this tree and is a wrapper for all objects that
  28 // are frame-specific (as opposed to page-specific).
  29 class CONTENT_EXPORT FrameTreeNode {
  30  public:
  31
  32   FrameTreeNode(FrameTree* frame_tree,
  33                 Navigator* navigator,
  34                 RenderFrameHostDelegate* render_frame_delegate,
  35                 RenderViewHostDelegate* render_view_delegate,
  36                 RenderWidgetHostDelegate* render_widget_delegate,
  37                 RenderFrameHostManager::Delegate* manager_delegate,
  38                 const std::string& name);
  39
  40   ~FrameTreeNode();
  41
  42   bool IsMainFrame() const;
  43
  44   void AddChild(scoped_ptr<FrameTreeNode> child,
  45                 int process_id,
  46                 int frame_routing_id);
  47   void RemoveChild(FrameTreeNode* child);
  48
  49   // Clears process specific-state in this node to prepare for a new process.
  50   void ResetForNewProcess();
  51
  52   FrameTree* frame_tree() const {
  53     return frame_tree_;
  54   }
  55
  56   Navigator* navigator() {
  57     return navigator_.get();
  58   }
  59
  60   RenderFrameHostManager* render_manager() {
  61     return &render_manager_;
  62   }
  63
  64   int64 frame_tree_node_id() const {
  65     return frame_tree_node_id_;
  66   }
  67
  68   const std::string& frame_name() const {
  69     return frame_name_;
  70   }
  71
  72   size_t child_count() const {
  73     return children_.size();
  74   }
  75
  76   FrameTreeNode* parent() const { return parent_; }
  77
  78   FrameTreeNode* child_at(size_t index) const {
  79     return children_[index];
  80   }
  81
  82   const GURL& current_url() const {
  83     return current_url_;
  84   }
  85
  86   void set_current_url(const GURL& url) {
  87     current_url_ = url;
  88   }
  89
  90   RenderFrameHostImpl* current_frame_host() const {
  91     return render_manager_.current_frame_host();
  92   }
  93
  94  private:
  95   void set_parent(FrameTreeNode* parent) { parent_ = parent; }
  96
  97   // The next available browser-global FrameTreeNode ID.
  98   static int64 next_frame_tree_node_id_;
  99
 100   // The FrameTree that owns us.
 101   FrameTree* frame_tree_;  // not owned.
 102
 103   // The Navigator object responsible for managing navigations at this node
 104   // of the frame tree.
 105   scoped_refptr<Navigator> navigator_;
 106
 107   // Manages creation and swapping of RenderFrameHosts for this frame.  This
 108   // must be declared before |children_| so that it gets deleted after them.
 109   //  That's currently necessary so that RenderFrameHostImpl's destructor can
 110   // call GetProcess.
 111   RenderFrameHostManager render_manager_;
 112
 113   // A browser-global identifier for the frame in the page, which stays stable
 114   // even if the frame does a cross-process navigation.
 115   const int64 frame_tree_node_id_;
 116
 117   // The assigned name of the frame. This name can be empty, unlike the unique
 118   // name generated internally in the DOM tree.
 119   std::string frame_name_;
 120
 121   // The parent node of this frame. NULL if this node is the root or if it has
 122   // not yet been attached to the frame tree.
 123   FrameTreeNode* parent_;
 124
 125   // The immediate children of this specific frame.
 126   ScopedVector<FrameTreeNode> children_;
 127
 128   // Track the current frame's last committed URL, so we can estimate the
 129   // process impact of out-of-process iframes.
 130   // TODO(creis): Remove this when we can store subframe URLs in the
 131   // NavigationController.
 132   GURL current_url_;
 133
 134   DISALLOW_COPY_AND_ASSIGN(FrameTreeNode);
 135 };
 136
 137 }  // namespace content
 138
 139 #endif  // CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_