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_(nullptr) {
  15   Observe(web_contents);
  16 }
  17
  18 WebContentsObserver::WebContentsObserver()
  19     : web_contents_(nullptr) {
  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(
  45     const IPC::Message& message,
  46     RenderFrameHost* render_frame_host) {
  47   return false;
  48 }
  49
  50 bool WebContentsObserver::OnMessageReceived(const IPC::Message& message) {
  51   return false;
  52 }
  53
  54 bool WebContentsObserver::Send(IPC::Message* message) {
  55   if (!web_contents_) {
  56     delete message;
  57     return false;
  58   }
  59
  60   return web_contents_->Send(message);
  61 }
  62
  63 int WebContentsObserver::routing_id() const {
  64   if (!web_contents_)
  65     return MSG_ROUTING_NONE;
  66
  67   return web_contents_->GetRoutingID();
  68 }
  69
  70 void WebContentsObserver::ResetWebContents() {
  71   web_contents_->RemoveObserver(this);
  72   web_contents_ = nullptr;
  73 }
  74
  75 }  // namespace content