content/browser/media/media_internals_handler.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/browser/media/media_internals_handler.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/values.h"
  10 #include "content/browser/media/media_internals_proxy.h"
  11 #include "content/public/browser/browser_thread.h"
  12 #include "content/public/browser/render_frame_host.h"
  13 #include "content/public/browser/web_contents.h"
  14 #include "content/public/browser/web_ui.h"
  15
  16 namespace content {
  17
  18 MediaInternalsMessageHandler::MediaInternalsMessageHandler()
  19     : proxy_(new MediaInternalsProxy()),
  20       page_load_complete_(false) {}
  21
  22 MediaInternalsMessageHandler::~MediaInternalsMessageHandler() {
  23   proxy_->Detach();
  24 }
  25
  26 void MediaInternalsMessageHandler::RegisterMessages() {
  27   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  28   proxy_->Attach(this);
  29
  30   web_ui()->RegisterMessageCallback("getEverything",
  31       base::Bind(&MediaInternalsMessageHandler::OnGetEverything,
  32                  base::Unretained(this)));
  33 }
  34
  35 void MediaInternalsMessageHandler::OnGetEverything(
  36     const base::ListValue* list) {
  37   page_load_complete_ = true;
  38   proxy_->GetEverything();
  39 }
  40
  41 void MediaInternalsMessageHandler::OnUpdate(const base::string16& update) {
  42   // Don't try to execute JavaScript in a RenderView that no longer exists nor
  43   // if the chrome://media-internals page hasn't finished loading.
  44   RenderFrameHost* host = web_ui()->GetWebContents()->GetMainFrame();
  45   if (host && page_load_complete_)
  46     host->ExecuteJavaScript(update);
  47 }
  48
  49 }  // namespace content