content/public/browser/web_contents_observer.cc

   1 // Copyright (c) 2012 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/browser/web_contents_observer.h"
   6
   7 #include "content/browser/web_contents/web_contents_impl.h"
   8 #include "content/public/browser/navigation_details.h"
   9 #include "content/public/browser/render_view_host.h"
  10
  11 namespace content {
  12
  13 WebContentsObserver::WebContentsObserver(WebContents* web_contents)
  14     : web_contents_(NULL) {
  15   Observe(web_contents);
  16 }
  17
  18 WebContentsObserver::WebContentsObserver()
  19     : web_contents_(NULL) {
  20 }
  21
  22 WebContentsObserver::~WebContentsObserver() {
  23   if (web_contents_)
  24     web_contents_->RemoveObserver(this);
  25 }
  26
  27 WebContents* WebContentsObserver::web_contents() const {
  28   return web_contents_;
  29 }
  30
  31 void WebContentsObserver::Observe(WebContents* web_contents) {
  32   if (web_contents_)
  33     web_contents_->RemoveObserver(this);
  34   web_contents_ = static_cast<WebContentsImpl*>(web_contents);
  35   if (web_contents_) {
  36     web_contents_->AddObserver(this);
  37   }
  38 }
  39
  40 bool WebContentsObserver::OnMessageReceived(const IPC::Message& message) {
  41   return false;
  42 }
  43
  44 bool WebContentsObserver::Send(IPC::Message* message) {
  45   if (!web_contents_) {
  46     delete message;
  47     return false;
  48   }
  49
  50   return web_contents_->Send(message);
  51 }
  52
  53 int WebContentsObserver::routing_id() const {
  54   if (!web_contents_)
  55     return MSG_ROUTING_NONE;
  56
  57   return web_contents_->GetRoutingID();
  58 }
  59
  60 void WebContentsObserver::WebContentsImplDestroyed() {
  61   // Do cleanup so that 'this' can safely be deleted from WebContentsDestroyed.
  62   web_contents_->RemoveObserver(this);
  63   WebContentsImpl* contents = web_contents_;
  64   web_contents_ = NULL;
  65   WebContentsDestroyed(contents);
  66 }
  67
  68 }  // namespace content