Allow focus to be sent between browser window and launcher/status window

ash/focus_cycler.cc

Index: ash/focus_cycler.cc
diff --git a/ash/focus_cycler.cc b/ash/focus_cycler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..71d305891c4b2af843413844b35dd9a809b25389
--- /dev/null
+++ b/ash/focus_cycler.cc
@@ -0,0 +1,100 @@
+// 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/focus_cycler.h"
+
+#include "ash/shell.h"
+#include "ash/shell_delegate.h"
+#include "ui/views/widget/widget.h"
+#include "ui/views/focus/focus_search.h"
+#include "ui/aura/window.h"
+#include "ui/aura/client/activation_client.h"
+
+#include "ui/views/accessible_pane_view.h"
+
+namespace ash {
+
+namespace internal {
+
+FocusCycler::FocusCycler() {
+}
+
+FocusCycler::~FocusCycler() {
+}
+
+void FocusCycler::AddWidget(views::Widget* widget) {
+  widgets_.push_back(widget);
+
+  widget->GetFocusManager()->RegisterAccelerator(
+      ui::Accelerator(ui::VKEY_F2, false, true, false), this);
+  widget->GetFocusManager()->RegisterAccelerator(
+      ui::Accelerator(ui::VKEY_F1, false, true, false), this);
+}
+
+void FocusCycler::RotateFocus(Direction direction) {
+  int index = 0;
+  int count = static_cast<int>(widgets_.size());
+  int browser_index = count;
+
+  for (; index < count; ++index) {
+    if (widgets_[index]->IsActive())
+      break;
+  }
+
+  int start_index = index;
+
+  count = count + 1;
+
+  for (;;) {
+    if (direction == FORWARD)
+      index = (index + 1) % count;
+    else
+      index = ((index - 1) + count) % count;
+
+    // Ensure that we don't loop more than once.
+    if (index == start_index)
+      break;
+
+    if (index == browser_index) {
+      // Activate the browser window.
+      const std::vector<aura::Window*>& windows =
+          Shell::GetInstance()->delegate()->GetCycleWindowList(
+              ShellDelegate::SOURCE_LAUNCHER, ShellDelegate::ORDER_MRU);
+      if (!windows.empty()) {
+        aura::client::GetActivationClient()->ActivateWindow(windows[0]);
+        break;
+      }
+    } else {
+      views::Widget* widget = widgets_[index];
+
+      views::AccessiblePaneView* view =
+          static_cast<views::AccessiblePaneView*>(widget->GetContentsView());
+      if (view->SetPaneFocusAndFocusDefault()) {
+        widget->Activate();
+        break;
+      }
+    }
+  }
+}
+
+bool FocusCycler::AcceleratorPressed(const ui::Accelerator& accelerator) {
+  switch (accelerator.key_code()) {
+    case ui::VKEY_F1:
+      RotateFocus(BACKWARD);
+      return true;
+    case ui::VKEY_F2:
+      RotateFocus(FORWARD);
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool FocusCycler::CanHandleAccelerators() const {
+  return true;
+}
+
+}  // namespace internal
+
+}  // namespace ash