Make accelerators not to work when the keyboard overlay is shown.

ash/keyboard_overlay/keyboard_overlay_view.cc

 // 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/keyboard_overlay/keyboard_overlay_view.h"
 
 #include "ash/keyboard_overlay/keyboard_overlay_delegate.h"
+#include "ash/shell.h"
 #include "base/utf_string_conversions.h"
 #include "content/public/browser/browser_context.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/screen.h"
 #include "ui/views/widget/widget.h"
 #include "ui/web_dialogs/web_dialog_delegate.h"
 
 using ui::WebDialogDelegate;
 
 namespace {
-// Store the pointer to the view currently shown.
-KeyboardOverlayView* g_instance = NULL;
+
+// Keys to invoke Cancel (Escape, Ctrl+Alt+/, or Shift+Ctrl+Alt+/).
+const struct KeyEventData {
+  ui::KeyboardCode key_code;
+  int flags;
+} kCancelKeys[] = {
+  { ui::VKEY_ESCAPE, 0},
+  { ui::VKEY_OEM_2, ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN },
+  { ui::VKEY_OEM_2, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN },
+};
+
 }
 
 KeyboardOverlayView::KeyboardOverlayView(
     content::BrowserContext* context,
     WebDialogDelegate* delegate,
     WebContentsHandler* handler)
     : views::WebDialogView(context, delegate, handler) {
 }
 
 KeyboardOverlayView::~KeyboardOverlayView() {
 }
 
+void KeyboardOverlayView::Cancel() {
+  ash::Shell::GetInstance()->overlay_filter()->Deactivate();
+  views::Widget* widget = GetWidget();
+  if (widget)
+    widget->Close();
+}
+
+bool KeyboardOverlayView::IsCancelingKeyEvent(aura::KeyEvent* event) {
+  if (event->type() != ui::ET_KEY_PRESSED)
+    return false;
+  for (size_t i = 0; i < arraysize(kCancelKeys); ++i) {
+    if ((kCancelKeys[i].key_code == event->key_code()) &&
+        (kCancelKeys[i].flags == event->flags()))
+      return true;
+  }
+  return false;
+}
+
+aura::Window* KeyboardOverlayView::GetWindow() {
+  return GetWidget()->GetNativeWindow();
+}
+
 void KeyboardOverlayView::ShowDialog(
     content::BrowserContext* context,
     WebContentsHandler* handler,
     const GURL& url) {
-  // Ignore the call if another view is already shown.
-  if (g_instance)
-    return;
-
   KeyboardOverlayDelegate* delegate = new KeyboardOverlayDelegate(
       l10n_util::GetStringUTF16(IDS_ASH_KEYBOARD_OVERLAY_TITLE), url);
   KeyboardOverlayView* view =
       new KeyboardOverlayView(context, delegate, handler);
   delegate->Show(view);
 
-  g_instance = view;
+  ash::Shell::GetInstance()->overlay_filter()->Activate(view);
 }
 
 void KeyboardOverlayView::WindowClosing() {
-  g_instance = NULL;
+  Cancel();
 }