WebUI TaskManager: Supports background-page mode.

chrome/browser/ui/webui/task_manager_dialog.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/task_manager_dialog.h"
 
 #include "base/memory/singleton.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/webui/html_dialog_ui.h"
 #include "chrome/common/url_constants.h"
 #include "grit/google_chrome_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 
 class TaskManagerDialogImpl : public HtmlDialogUIDelegate {
  public:
   TaskManagerDialogImpl();
 
-  static void Show();
+  static void Show(bool is_background_page_mode);
   static TaskManagerDialogImpl* GetInstance();
 
  protected:
   friend struct DefaultSingletonTraits<TaskManagerDialogImpl>;
   virtual ~TaskManagerDialogImpl();
 
   void OnCloseDialog();
 
   // Overridden from HtmlDialogUIDelegate:
   virtual bool IsDialogModal() const OVERRIDE {
     return false;
   }
   virtual string16 GetDialogTitle() const OVERRIDE {
     return l10n_util::GetStringUTF16(IDS_TASK_MANAGER_TITLE);
   }
   virtual GURL GetDialogContentURL() const OVERRIDE {
     std::string url_string(chrome::kChromeUITaskManagerURL);
+    if (is_background_page_mode_)
+      url_string += "#bg";
     return GURL(url_string);
   }
   virtual void GetWebUIMessageHandlers(
       std::vector<WebUIMessageHandler*>* handlers) const OVERRIDE {
   }
   virtual void GetDialogSize(gfx::Size* size) const OVERRIDE {
     size->SetSize(640, 480);
   }
   virtual std::string GetDialogArgs() const OVERRIDE {
     return std::string();
   }
   virtual void OnDialogClosed(const std::string& json_retval) OVERRIDE {
     OnCloseDialog();
   }
   virtual void OnCloseContents(TabContents* source, bool* out_close_dialog)
       OVERRIDE {
     *out_close_dialog = true;
     OnCloseDialog();
   }
   virtual bool ShouldShowDialogTitle() const OVERRIDE {
     return false;
   }
   virtual bool HandleContextMenu(const ContextMenuParams& params) OVERRIDE {
     return true;
   }
 
  private:
-  void ShowDialog();
+  void ShowDialog(bool is_background_page_mode);
   void OpenHtmlDialog();
 
   bool is_shown_;
+  bool is_background_page_mode_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerDialogImpl);
 };
 
 // ****************************************************
 
 // static
 TaskManagerDialogImpl* TaskManagerDialogImpl::GetInstance() {
   DCHECK(!BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(!BrowserThread::CurrentlyOn(BrowserThread::FILE));
   return Singleton<TaskManagerDialogImpl>::get();
 }
 
-TaskManagerDialogImpl::TaskManagerDialogImpl() : is_shown_(false) {
+TaskManagerDialogImpl::TaskManagerDialogImpl()
+    : is_shown_(false), is_background_page_mode_(false) {
 }
 
 TaskManagerDialogImpl::~TaskManagerDialogImpl() {
 }
 
-void TaskManagerDialogImpl::Show() {
+// static
+void TaskManagerDialogImpl::Show(bool is_background_page_mode) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   TaskManagerDialogImpl* dialog = TaskManagerDialogImpl::GetInstance();
-  dialog->ShowDialog();
+  dialog->ShowDialog(is_background_page_mode);
 }
 
-void TaskManagerDialogImpl::ShowDialog() {
+void TaskManagerDialogImpl::ShowDialog(bool is_background_page_mode) {
   // TODO(yoshiki): Brings up existing UI when called with is_shown_ == TRUE
   if (!is_shown_) {
     is_shown_ = true;
+    is_background_page_mode_ = is_background_page_mode;
     OpenHtmlDialog();
   }
 }
 
 void TaskManagerDialogImpl::OnCloseDialog() {
   if (is_shown_)
     is_shown_ = false;
 }
 
 void TaskManagerDialogImpl::OpenHtmlDialog() {
   Browser* browser = BrowserList::GetLastActive();
   browser->BrowserShowHtmlDialog(this, NULL);
 }
 
 // ****************************************************
 //
 // static
 void TaskManagerDialog::Show() {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
-      NewRunnableFunction(&TaskManagerDialogImpl::Show));
+      NewRunnableFunction(&TaskManagerDialogImpl::Show, false));
 }
 
+// static
+void TaskManagerDialog::ShowBackgroundPages() {
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      NewRunnableFunction(&TaskManagerDialogImpl::Show, true));
+}
+