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

ash/display/display_error_dialog.cc

Index: ash/display/display_error_dialog.cc
diff --git a/ash/display/display_error_dialog.cc b/ash/display/display_error_dialog.cc
new file mode 100644
index 0000000000000000000000000000000000000000..53f859b895e810fbffe923c57ffcaeafa07d8864
--- /dev/null
+++ b/ash/display/display_error_dialog.cc
@@ -0,0 +1,88 @@
+// 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/display/display_controller.h"
+#include "ash/shell.h"
+#include "ash/shell_window_ids.h"
+#include "base/utf_string_conversions.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/rect.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;
+
+}  // namespace
+
+// static
+void  DisplayErrorDialog::ShowDialog() {
+  DisplayController* display_controller =

[oshima, 2012/10/01 21:45:20]

what happens when I tried to mirror while this is open?

[Jun Mukai, 2012/10/01 23:59:34]

Good point... Added a global variable to make this singleton.

+      Shell::GetInstance()->display_controller();
+  gfx::Display* secondary_display = display_controller->GetSecondaryDisplay();

[oshima, 2012/10/01 21:45:20]

SceenAsh::GetSecondaryDisplay()

[Jun Mukai, 2012/10/01 23:59:34]

Done.

+  aura::RootWindow* root_window =
+      display_controller->GetRootWindowForDisplayId(secondary_display->id());
+
+  DisplayErrorDialog* dialog = new DisplayErrorDialog();
+  // Need to specify bounds here since the default bounds will change the parent
+  // to the primary root.  Size will be fixed in CenterWindow() below.
+  views::Widget* widget = views::Widget::CreateWindowWithParentAndBounds(
+      dialog,
+      Shell::GetContainer(root_window, kShellWindowId_AlwaysOnTopContainer),

[oshima, 2012/10/01 21:45:20]

can you use Widget::InitParams::keep_on_top?

[Jun Mukai, 2012/10/01 23:59:34]

Done.

+      secondary_display->bounds());
+  widget->GetNativeView()->SetName("DisplayErrorDialog");
+  widget->CenterWindow(widget->GetRootView()->GetPreferredSize());
+  widget->Show();
+}
+
+DisplayErrorDialog::DisplayErrorDialog() {
+  views::View* container = GetContentsView();
+  label_ = new views::Label(
+      l10n_util::GetStringUTF16(IDS_ASH_DISPLAY_FAILURE_ON_MIRRORING));
+  container->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() {
+}
+
+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();
+}
+
+}  // namespace internal
+}  // namespace ash