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.
5 #ifndef CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_
6 #define CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_
10 #include "base/basictypes.h"
11 #include "base/memory/scoped_ptr.h"
12 #include "base/memory/scoped_vector.h"
13 #include "content/common/content_export.h"
18 class RenderFrameHostImpl;
20 // When a page contains iframes, its renderer process maintains a tree structure
21 // of those frames. We are mirroring this tree in the browser process. This
22 // class represents a node in this tree and is a wrapper for all objects that
23 // are frame-specific (as opposed to page-specific).
24 class CONTENT_EXPORT FrameTreeNode {
26 static const int64 kInvalidFrameId;
28 FrameTreeNode(int64 frame_id, const std::string& name,
29 scoped_ptr<RenderFrameHostImpl> render_frame_host);
32 void AddChild(scoped_ptr<FrameTreeNode> child);
33 void RemoveChild(int64 child_id);
35 // Transitional API allowing the RenderFrameHost of a FrameTreeNode
36 // representing the main frame to be provided by someone else. After
37 // this is called, the FrameTreeNode no longer owns its RenderFrameHost.
39 // This should only be used for the main frame (aka root) in a frame tree.
41 // TODO(ajwong): Remove this method once the main frame RenderFrameHostImpl is
42 // no longer owned by the RenderViewHostImpl.
43 void ResetForMainFrame(RenderFrameHostImpl* new_render_frame_host);
45 void set_frame_id(int64 frame_id) {
46 DCHECK_EQ(frame_id_, kInvalidFrameId);
50 int64 frame_id() const {
54 const std::string& frame_name() const {
58 size_t child_count() const {
59 return children_.size();
62 FrameTreeNode* child_at(size_t index) const {
63 return children_[index];
66 const GURL& current_url() const {
70 void set_current_url(const GURL& url) {
74 RenderFrameHostImpl* render_frame_host() const {
75 return render_frame_host_;
79 // The unique identifier for the frame in the page.
82 // The assigned name of the frame. This name can be empty, unlike the unique
83 // name generated internally in the DOM tree.
84 std::string frame_name_;
86 // The immediate children of this specific frame.
87 ScopedVector<FrameTreeNode> children_;
89 // When ResetForMainFrame() is called, this is set to false and the
90 // |render_frame_host_| below is not deleted on destruction.
92 // For the mainframe, the FrameTree does not own the |render_frame_host_|.
93 // This is a transitional wart because RenderViewHostManager does not yet
94 // have the bookkeeping logic to handle creating a pending RenderFrameHost
95 // along with a pending RenderViewHost. Thus, for the main frame, the
96 // RenderViewHost currently retains ownership and the FrameTreeNode should
97 // not delete it on destruction.
98 bool owns_render_frame_host_;
100 // The active RenderFrameHost for this frame. The FrameTreeNode does not
101 // always own this pointer. See comments above |owns_render_frame_host_|.
102 // TODO(ajwong): Replace with RenderFrameHostManager.
103 RenderFrameHostImpl* render_frame_host_;
105 // Track the current frame's last committed URL, so we can estimate the
106 // process impact of out-of-process iframes.
107 // TODO(creis): Remove this when we can store subframe URLs in the
108 // NavigationController.
111 DISALLOW_COPY_AND_ASSIGN(FrameTreeNode);
114 } // namespace content
116 #endif // CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_NODE_H_