Adds DisplayErrorDialog to show the error message of the failure of mirroring to the users.

This CL depends on http://codereview.chromium.org/10989084/.

BUG=149061


Review URL: https://chromiumcodereview.appspot.com/10986087

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@160521 0039d316-1c4b-4281-b951-d872f2087c98

ash/ash.gyp

@@ -74,6 +74,8 @@
         'desktop_background/desktop_background_widget_controller.h',
         'display/display_controller.cc',
         'display/display_controller.h',
+        'display/display_error_dialog.cc',
+        'display/display_error_dialog.h',
         'display/mouse_cursor_event_filter.cc',
         'display/mouse_cursor_event_filter.h',
         'display/multi_display_manager.cc',

ash/ash_strings.grd

@@ -473,6 +473,9 @@ Press Search or Shift to cancel.
       <message name="IDS_ASH_MINIMIZE_WINDOW" desc="A help text to show that when the button gets clicked the window gets minimized.">
         Minimize
       </message>
+      <message name="IDS_ASH_DISPLAY_FAILURE_ON_MIRRORING" desc="An error message to show that the system failed to enter the mirroring mode.">
+	Can't duplicate image on attached monitors. No matching resolution found.
+      </message>
     </messages>
   </release>
 </grit>

ash/display/display_error_dialog.cc

@@ -0,0 +1,101 @@
+// Copyright (c) 2012 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 "ash/display/display_error_dialog.h"
+
+#include "ash/screen_ash.h"
+#include "ash/shell.h"
+#include "grit/ash_strings.h"
+#include "ui/aura/window.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/ui_base_types.h"
+#include "ui/gfx/display.h"
+#include "ui/gfx/screen.h"
+#include "ui/views/border.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/widget/widget.h"
+
+namespace ash {
+namespace internal {
+namespace {
+
+// The width of the area to show the error message.
+const int kDialogMessageWidthPixel = 300;
+
+// The margin width from the error message to the edge of the dialog.
+const int kDialogMessageMarginWidthPixel = 5;
+
+DisplayErrorDialog* g_instance = NULL;
+
+}  // namespace
+
+// static
+void  DisplayErrorDialog::ShowDialog() {
+  if (g_instance) {
+    DCHECK(g_instance->GetWidget());
+    g_instance->GetWidget()->StackAtTop();
+    g_instance->GetWidget()->Activate();
+    return;
+  }
+
+  const gfx::Display& secondary_display = ash::ScreenAsh::GetSecondaryDisplay();
+
+  g_instance = new DisplayErrorDialog();
+  views::Widget* widget = new views::Widget;
+  views::Widget::InitParams params(views::Widget::InitParams::TYPE_WINDOW);
+  params.delegate = g_instance;
+  // Makes |widget| belong to the secondary display.  Size and location are
+  // fixed by CenterWindow() below.
+  params.bounds = secondary_display.bounds();
+  params.keep_on_top = true;
+  widget->Init(params);
+
+  widget->GetNativeView()->SetName("DisplayErrorDialog");
+  widget->CenterWindow(widget->GetRootView()->GetPreferredSize());
+  widget->Show();
+}
+
+DisplayErrorDialog::DisplayErrorDialog() {
+  Shell::GetInstance()->display_controller()->AddObserver(this);
+  label_ = new views::Label(
+      l10n_util::GetStringUTF16(IDS_ASH_DISPLAY_FAILURE_ON_MIRRORING));
+  AddChildView(label_);
+
+  label_->SetMultiLine(true);
+  label_->SetHorizontalAlignment(views::Label::ALIGN_LEFT);
+  label_->set_border(views::Border::CreateEmptyBorder(
+      kDialogMessageMarginWidthPixel,
+      kDialogMessageMarginWidthPixel,
+      kDialogMessageMarginWidthPixel,
+      kDialogMessageMarginWidthPixel));
+  label_->SizeToFit(kDialogMessageWidthPixel);
+}
+
+DisplayErrorDialog::~DisplayErrorDialog() {
+  Shell::GetInstance()->display_controller()->RemoveObserver(this);
+  g_instance = NULL;
+}
+
+int DisplayErrorDialog::GetDialogButtons() const {
+  return ui::DIALOG_BUTTON_OK;
+}
+
+ui::ModalType DisplayErrorDialog::GetModalType() const {
+  return ui::MODAL_TYPE_NONE;
+}
+
+views::View* DisplayErrorDialog::GetContentsView() {
+  return this;
+}
+
+gfx::Size DisplayErrorDialog::GetPreferredSize() {
+  return label_->GetPreferredSize();
+}
+
+void DisplayErrorDialog::OnDisplayConfigurationChanging() {
+  GetWidget()->Close();
+}
+
+}  // namespace internal
+}  // namespace ash

ash/display/display_error_dialog.h

@@ -0,0 +1,61 @@
+// Copyright (c) 2012 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.
+
+#ifndef ASH_DISPLAY_DISPLAY_ERROR_DIALOG_H_
+#define ASH_DISPLAY_DISPLAY_ERROR_DIALOG_H_
+
+#include "ash/display/display_controller.h"
+#include "base/compiler_specific.h"
+#include "ui/views/window/dialog_delegate.h"
+
+namespace aura {
+class RootWindow;
+}  // namespace aura
+
+namespace gfx {
+class Display;
+class Size;
+}  // namespace gfx
+
+namespace views {
+class Label;
+}  // namespace views
+
+namespace ash {
+namespace internal {
+
+// Dialog used to show an error messages when unable to change the display
+// configuration to mirroring.
+class DisplayErrorDialog : public views::DialogDelegateView,
+                           public ash::DisplayController::Observer {
+ public:
+  // Shows the error dialog.
+  static void ShowDialog();
+
+ private:
+  DisplayErrorDialog();
+  virtual ~DisplayErrorDialog();
+
+  // views::DialogDelegate overrides:
+  virtual int GetDialogButtons() const OVERRIDE;
+
+  // views::WidgetDelegate overrides::
+  virtual ui::ModalType GetModalType() const OVERRIDE;
+  virtual views::View* GetContentsView() OVERRIDE;
+
+  // views::View overrides:
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+
+  // ash::DisplayController::Observer overrides:
+  virtual void OnDisplayConfigurationChanging() OVERRIDE;
+
+  views::Label* label_;
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayErrorDialog);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_DISPLAY_DISPLAY_ERROR_DIALOG_H_

ash/display/output_configurator_animation.cc

@@ -4,6 +4,7 @@
 
 #include "ash/display/output_configurator_animation.h"
 
+#include "ash/display/display_error_dialog.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "base/bind.h"
@@ -209,6 +210,7 @@ void OutputConfiguratorAnimation::OnDisplayModeChanged() {
 void OutputConfiguratorAnimation::OnDisplayModeChangeFailed() {
   if (!hiding_layers_.empty())
     StartFadeInAnimation();
+  DisplayErrorDialog::ShowDialog();
 }
 
 void OutputConfiguratorAnimation::ClearHidingLayers() {