content/public/renderer/render_view_observer.cc

   1 // Copyright (c) 2011 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/public/renderer/render_view_observer.h"
   6
   7 #include "content/renderer/render_view_impl.h"
   8
   9 using blink::WebFrame;
  10
  11 namespace content {
  12
  13 RenderViewObserver::RenderViewObserver(RenderView* render_view)
  14     : render_view_(render_view),
  15       routing_id_(MSG_ROUTING_NONE) {
  16   // |render_view| can be NULL on unit testing or if Observe() is used.
  17   if (render_view) {
  18     RenderViewImpl* impl = static_cast<RenderViewImpl*>(render_view);
  19     routing_id_ = impl->routing_id();
  20     // TODO(jam): bring this back DCHECK_NE(routing_id_, MSG_ROUTING_NONE);
  21     impl->AddObserver(this);
  22   }
  23 }
  24
  25 RenderViewObserver::~RenderViewObserver() {
  26   if (render_view_) {
  27     RenderViewImpl* impl = static_cast<RenderViewImpl*>(render_view_);
  28     impl->RemoveObserver(this);
  29   }
  30 }
  31
  32 void RenderViewObserver::OnDestruct() {
  33   delete this;
  34 }
  35
  36 bool RenderViewObserver::OnMessageReceived(const IPC::Message& message) {
  37   return false;
  38 }
  39
  40 bool RenderViewObserver::Send(IPC::Message* message) {
  41   if (render_view_)
  42     return render_view_->Send(message);
  43
  44   delete message;
  45   return false;
  46 }
  47
  48 RenderView* RenderViewObserver::render_view() const {
  49   return render_view_;
  50 }
  51
  52 void RenderViewObserver::RenderViewGone() {
  53   render_view_ = NULL;
  54 }
  55
  56 void RenderViewObserver::Observe(RenderView* render_view) {
  57   RenderViewImpl* impl = static_cast<RenderViewImpl*>(render_view_);
  58   if (impl) {
  59     impl->RemoveObserver(this);
  60     routing_id_ = 0;
  61   }
  62
  63   render_view_ = render_view;
  64   impl = static_cast<RenderViewImpl*>(render_view_);
  65   if (impl) {
  66     routing_id_ = impl->routing_id();
  67     impl->AddObserver(this);
  68   }
  69 }
  70
  71 }  // namespace content