Keyboard accessibility for the page and app menus.

Works on Windows, and on Linux with toolkit_views.

The goal is to make Chrome behave more like a standard Windows
application, for users who rely on the keyboard and expect standard
keyboard accelerators to work.

Pressing F10, or pressing and releasing Alt, will set focus to the
Page menu, as if it was the first item in a menu bar.

Pressing enter, space, up arrow, or down arrow will open the focused menu.
Once a menu is opened, pressing left and right arrows will switch between
the two menus. Pressing escape will return focus to the title of the
previously open menu.

A new UI test attempts to select something from the menus using only the
keyboard. It works on Linux (with toolkit_views) and on Windows.

BUG=none
TEST=New keyboard accessibility interactive ui test.

Review URL: http://codereview.chromium.org/660323

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@43216 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 9 insertions, 0 deletions

diff --git a/views/window/window_win.cc b/views/window/window_win.cc
index 4013523d9..18857fa 100644
--- a/views/window/window_win.cc
+++ b/views/window/window_win.cc
@@ -1086,6 +1086,15 @@ void WindowWin::OnSysCommand(UINT notification_code, CPoint click) {
     }
   }
 
+  // Handle SC_KEYMENU, which means that the user has pressed the ALT
+  // key and released it, so we should focus the menu bar.
+  if ((notification_code & sc_mask) == SC_KEYMENU && click.x == 0) {
+    Accelerator accelerator(win_util::WinToKeyboardCode(VK_MENU),
+                            false, false, false);
+    GetFocusManager()->ProcessAccelerator(accelerator);
+    return;
+  }
+
   // First see if the delegate can handle it.
   if (window_delegate_->ExecuteWindowsCommand(notification_code))
     return;