1 files changed, 115 insertions, 0 deletions
diff --git a/chromium/ash/focus_cycler.cc b/chromium/ash/focus_cycler.cc
new file mode 100644
index 00000000000..c83db87b134
--- /dev/null
+++ b/chromium/ash/focus_cycler.cc
@@ -0,0 +1,115 @@
+// 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/wm/mru_window_tracker.h"
+#include "ash/wm/window_cycle_controller.h"
+#include "ash/wm/window_util.h"
+#include "ui/aura/client/activation_client.h"
+#include "ui/aura/window.h"
+#include "ui/views/accessible_pane_view.h"
+#include "ui/views/focus/focus_search.h"
+#include "ui/views/widget/widget.h"
+
+namespace ash {
+
+namespace {
+
+bool HasFocusableWindow() {
+  return !MruWindowTracker::BuildWindowList(false).empty();
+}
+
+}  // namespace
+
+namespace internal {
+
+FocusCycler::FocusCycler() : widget_activating_(NULL) {
+}
+
+FocusCycler::~FocusCycler() {
+}
+
+void FocusCycler::AddWidget(views::Widget* widget) {
+  widgets_.push_back(widget);
+}
+
+void FocusCycler::RotateFocus(Direction direction) {
+  aura::Window* window = ash::wm::GetActiveWindow();
+  if (window) {
+    views::Widget* widget = views::Widget::GetWidgetForNativeWindow(window);
+    // First try to rotate focus within the active widget. If that succeeds,
+    // we're done.
+    if (widget && widget->GetFocusManager()->RotatePaneFocus(
+            direction == BACKWARD ?
+                views::FocusManager::kBackward : views::FocusManager::kForward,
+            views::FocusManager::kNoWrap)) {
+      return;
+    }
+  }
+
+  const bool has_window = HasFocusableWindow();
+  int index = 0;
+  int count = static_cast<int>(widgets_.size());
+  int browser_index = has_window ? count : -1;
+
+  for (; index < count; ++index) {
+    if (widgets_[index]->IsActive())
+      break;
+  }
+
+  int start_index = index;
+
+  if (has_window)
+    ++count;
+
+  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 most recently active browser window.
+      ash::Shell::GetInstance()->window_cycle_controller()->HandleCycleWindow(
+          WindowCycleController::FORWARD, false);
+
+      // Rotate pane focus within that window.
+      aura::Window* window = ash::wm::GetActiveWindow();
+      if (!window)
+        break;
+      views::Widget* widget = views::Widget::GetWidgetForNativeWindow(window);
+      if (!widget)
+        break;
+      views::FocusManager* focus_manager = widget->GetFocusManager();
+      focus_manager->ClearFocus();
+      focus_manager->RotatePaneFocus(
+          direction == BACKWARD ?
+              views::FocusManager::kBackward : views::FocusManager::kForward,
+          views::FocusManager::kWrap);
+      break;
+    } else {
+      if (FocusWidget(widgets_[index]))
+        break;
+    }
+  }
+}
+
+bool FocusCycler::FocusWidget(views::Widget* widget) {
+  // Note: It is not necessary to set the focus directly to the pane since that
+  // will be taken care of by the widget activation.
+  widget_activating_ = widget;
+  widget->Activate();
+  widget_activating_ = NULL;
+  return widget->IsActive();
+}
+
+}  // namespace internal
+
+}  // namespace ash