content/browser/frame_host/frame_tree_node.cc

   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/command_line.h"
  10 #include "base/stl_util.h"
  11 #include "content/browser/frame_host/frame_tree.h"
  12 #include "content/browser/frame_host/navigator.h"
  13 #include "content/browser/frame_host/render_frame_host_impl.h"
  14 #include "content/browser/renderer_host/render_view_host_impl.h"
  15 #include "content/public/common/content_switches.h"
  16
  17 namespace content {
  18
  19 int64 FrameTreeNode::next_frame_tree_node_id_ = 1;
  20
  21 FrameTreeNode::FrameTreeNode(FrameTree* frame_tree,
  22                              Navigator* navigator,
  23                              RenderFrameHostDelegate* render_frame_delegate,
  24                              RenderViewHostDelegate* render_view_delegate,
  25                              RenderWidgetHostDelegate* render_widget_delegate,
  26                              RenderFrameHostManager::Delegate* manager_delegate,
  27                              const std::string& name)
  28     : frame_tree_(frame_tree),
  29       navigator_(navigator),
  30       render_manager_(this,
  31                       render_frame_delegate,
  32                       render_view_delegate,
  33                       render_widget_delegate,
  34                       manager_delegate),
  35       frame_tree_node_id_(next_frame_tree_node_id_++),
  36       parent_(NULL),
  37       replication_state_(name),
  38       is_loading_(false) {
  39 }
  40
  41 FrameTreeNode::~FrameTreeNode() {
  42   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
  43           switches::kEnableBrowserSideNavigation)) {
  44     navigator_->CancelNavigation(this);
  45   }
  46 }
  47
  48 bool FrameTreeNode::IsMainFrame() const {
  49   return frame_tree_->root() == this;
  50 }
  51
  52 void FrameTreeNode::AddChild(scoped_ptr<FrameTreeNode> child,
  53                              int process_id,
  54                              int frame_routing_id) {
  55   // Child frame must always be created in the same process as the parent.
  56   CHECK_EQ(process_id, render_manager_.current_host()->GetProcess()->GetID());
  57
  58   // Initialize the RenderFrameHost for the new node.  We always create child
  59   // frames in the same SiteInstance as the current frame, and they can swap to
  60   // a different one if they navigate away.
  61   child->render_manager()->Init(
  62       render_manager_.current_host()->GetSiteInstance()->GetBrowserContext(),
  63       render_manager_.current_host()->GetSiteInstance(),
  64       render_manager_.current_host()->GetRoutingID(),
  65       frame_routing_id);
  66   child->set_parent(this);
  67   children_.push_back(child.release());
  68 }
  69
  70 void FrameTreeNode::RemoveChild(FrameTreeNode* child) {
  71   std::vector<FrameTreeNode*>::iterator iter;
  72
  73   for (iter = children_.begin(); iter != children_.end(); ++iter) {
  74     if ((*iter) == child)
  75       break;
  76   }
  77
  78   if (iter != children_.end()) {
  79     // Subtle: we need to make sure the node is gone from the tree before
  80     // observers are notified of its deletion.
  81     scoped_ptr<FrameTreeNode> node_to_delete(*iter);
  82     children_.weak_erase(iter);
  83     node_to_delete->set_parent(NULL);
  84     node_to_delete.reset();
  85   }
  86 }
  87
  88 void FrameTreeNode::ResetForNewProcess() {
  89   current_url_ = GURL();
  90
  91   // The children may not have been cleared if a cross-process navigation
  92   // commits before the old process cleans everything up.  Make sure the child
  93   // nodes get deleted before swapping to a new process.
  94   ScopedVector<FrameTreeNode> old_children = children_.Pass();
  95
  96   // Loop over all children removing them from the FrameTree. This will ensure
  97   // that nodes are properly removed from the tree and notifications are sent.
  98   // Note: since the |children_| vector is now empty, the calls into RemoveChild
  99   // will be a noop and will not result in repeatedly traversing the list.
 100   for (const auto& child : old_children)
 101     frame_tree_->RemoveFrame(child);
 102
 103   old_children.clear();  // May notify observers.
 104 }
 105
 106 bool FrameTreeNode::IsDescendantOf(FrameTreeNode* other) const {
 107   if (!other || !other->child_count())
 108     return false;
 109
 110   for (FrameTreeNode* node = parent(); node; node = node->parent()) {
 111     if (node == other)
 112       return true;
 113   }
 114
 115   return false;
 116 }
 117
 118 }  // namespace content