[Linux Views]Handle focus traversing correctly.

This CL adds a wrapper window class on top of GtkWindow to intercept its
move_focus method, so that we can handle focus traversing by ourselves.

BUG=49204: Chrome/views toolbar "tab" accessibility broken.
TEST=See bug report.

Review URL: http://codereview.chromium.org/3013006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53123 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 40 insertions, 0 deletions

diff --git a/views/widget/gtk_views_window.cc b/views/widget/gtk_views_window.cc
new file mode 100644
index 0000000..fb3657d
--- /dev/null
+++ b/views/widget/gtk_views_window.cc
@@ -0,0 +1,40 @@
+// Copyright (c) 2010 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 "views/widget/gtk_views_window.h"
+#include "views/focus/focus_manager.h"
+
+G_BEGIN_DECLS
+
+G_DEFINE_TYPE(GtkViewsWindow, gtk_views_window, GTK_TYPE_WINDOW)
+
+static void gtk_views_window_move_focus(GtkWindow *window,
+                                        GtkDirectionType dir) {
+  views::FocusManager* focus_manager =
+      views::FocusManager::GetFocusManagerForNativeWindow(window);
+  if (focus_manager) {
+    // We only support tab traversing by tab keys, so just ignore all other
+    // cases silently.
+    if (dir == GTK_DIR_TAB_BACKWARD || dir == GTK_DIR_TAB_FORWARD)
+      focus_manager->AdvanceFocus(dir == GTK_DIR_TAB_BACKWARD);
+  } else if (GTK_WINDOW_CLASS(gtk_views_window_parent_class)->move_focus) {
+    GTK_WINDOW_CLASS(gtk_views_window_parent_class)->move_focus(window, dir);
+  }
+}
+
+static void gtk_views_window_class_init(
+    GtkViewsWindowClass* views_window_class) {
+  GtkWindowClass* window_class =
+      reinterpret_cast<GtkWindowClass*>(views_window_class);
+  window_class->move_focus = gtk_views_window_move_focus;
+}
+
+static void gtk_views_window_init(GtkViewsWindow* window) {
+}
+
+GtkWidget* gtk_views_window_new(GtkWindowType type) {
+  return GTK_WIDGET(g_object_new(GTK_TYPE_VIEWS_WINDOW, "type", type, NULL));
+}
+
+G_END_DECLS