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 == web_contents_) {
  33     // Early exit to avoid infinite loops if we're in the middle of a callback.
  34     return;
  35   }
  36   if (web_contents_)
  37     web_contents_->RemoveObserver(this);
  38   web_contents_ = static_cast<WebContentsImpl*>(web_contents);
  39   if (web_contents_) {
  40     web_contents_->AddObserver(this);
  41   }
  42 }
  43
  44 bool WebContentsObserver::OnMessageReceived(const IPC::Message& message) {
  45   return false;
  46 }
  47
  48 bool WebContentsObserver::Send(IPC::Message* message) {
  49   if (!web_contents_) {
  50     delete message;
  51     return false;
  52   }
  53
  54   return web_contents_->Send(message);
  55 }
  56
  57 int WebContentsObserver::routing_id() const {
  58   if (!web_contents_)
  59     return MSG_ROUTING_NONE;
  60
  61   return web_contents_->GetRoutingID();
  62 }
  63
  64 void WebContentsObserver::WebContentsImplDestroyed() {
  65   // Do cleanup so that 'this' can safely be deleted from WebContentsDestroyed.
  66   web_contents_->RemoveObserver(this);
  67   WebContentsImpl* contents = web_contents_;
  68   web_contents_ = NULL;
  69   WebContentsDestroyed(contents);
  70 }
  71
  72 }  // namespace content