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      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 #include "content/browser/frame_host/frame_tree_node.h"
      6 
      7 #include <queue>
      8 
      9 #include "base/stl_util.h"
     10 #include "content/browser/frame_host/frame_tree.h"
     11 #include "content/browser/frame_host/navigator.h"
     12 #include "content/browser/frame_host/render_frame_host_impl.h"
     13 #include "content/browser/renderer_host/render_view_host_impl.h"
     14 
     15 namespace content {
     16 
     17 int64 FrameTreeNode::next_frame_tree_node_id_ = 1;
     18 
     19 FrameTreeNode::FrameTreeNode(FrameTree* frame_tree,
     20                              Navigator* navigator,
     21                              RenderFrameHostDelegate* render_frame_delegate,
     22                              RenderViewHostDelegate* render_view_delegate,
     23                              RenderWidgetHostDelegate* render_widget_delegate,
     24                              RenderFrameHostManager::Delegate* manager_delegate,
     25                              const std::string& name)
     26     : frame_tree_(frame_tree),
     27       navigator_(navigator),
     28       render_manager_(this,
     29                       render_frame_delegate,
     30                       render_view_delegate,
     31                       render_widget_delegate,
     32                       manager_delegate),
     33       frame_tree_node_id_(next_frame_tree_node_id_++),
     34       frame_name_(name),
     35       parent_(NULL) {}
     36 
     37 FrameTreeNode::~FrameTreeNode() {
     38 }
     39 
     40 bool FrameTreeNode::IsMainFrame() const {
     41   return frame_tree_->root() == this;
     42 }
     43 
     44 void FrameTreeNode::AddChild(scoped_ptr<FrameTreeNode> child,
     45                              int frame_routing_id) {
     46   // Initialize the RenderFrameHost for the new node.  We always create child
     47   // frames in the same SiteInstance as the current frame, and they can swap to
     48   // a different one if they navigate away.
     49   child->render_manager()->Init(
     50       render_manager_.current_host()->GetSiteInstance()->GetBrowserContext(),
     51       render_manager_.current_host()->GetSiteInstance(),
     52       render_manager_.current_host()->GetRoutingID(),
     53       frame_routing_id);
     54   child->set_parent(this);
     55   children_.push_back(child.release());
     56 }
     57 
     58 void FrameTreeNode::RemoveChild(FrameTreeNode* child) {
     59   std::vector<FrameTreeNode*>::iterator iter;
     60 
     61   for (iter = children_.begin(); iter != children_.end(); ++iter) {
     62     if ((*iter) == child)
     63       break;
     64   }
     65 
     66   if (iter != children_.end()) {
     67     // Subtle: we need to make sure the node is gone from the tree before
     68     // observers are notified of its deletion.
     69     scoped_ptr<FrameTreeNode> node_to_delete(*iter);
     70     children_.weak_erase(iter);
     71     node_to_delete->set_parent(NULL);
     72     node_to_delete.reset();
     73   }
     74 }
     75 
     76 void FrameTreeNode::ResetForNewProcess() {
     77   current_url_ = GURL();
     78 
     79   // The children may not have been cleared if a cross-process navigation
     80   // commits before the old process cleans everything up.  Make sure the child
     81   // nodes get deleted before swapping to a new process.
     82   ScopedVector<FrameTreeNode> old_children = children_.Pass();
     83   old_children.clear();  // May notify observers.
     84 }
     85 
     86 }  // namespace content
     87