1 files changed, 122 insertions, 0 deletions
diff --git a/chromium/ash/wm/window_selector_controller.cc b/chromium/ash/wm/window_selector_controller.cc
new file mode 100644
index 00000000000..e6cd3837a64
--- /dev/null
+++ b/chromium/ash/wm/window_selector_controller.cc
@@ -0,0 +1,122 @@
+// Copyright 2013 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/wm/window_selector_controller.h"
+
+#include "ash/session_state_delegate.h"
+#include "ash/shell.h"
+#include "ash/wm/mru_window_tracker.h"
+#include "ash/wm/window_selector.h"
+#include "ash/wm/window_util.h"
+#include "ui/base/events/event.h"
+#include "ui/base/events/event_handler.h"
+
+namespace ash {
+
+namespace {
+
+// Filter to watch for the termination of a keyboard gesture to cycle through
+// multiple windows.
+class WindowSelectorEventFilter : public ui::EventHandler {
+ public:
+  WindowSelectorEventFilter();
+  virtual ~WindowSelectorEventFilter();
+
+  // Overridden from ui::EventHandler:
+  virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WindowSelectorEventFilter);
+};
+
+// Watch for all keyboard events by filtering the root window.
+WindowSelectorEventFilter::WindowSelectorEventFilter() {
+  Shell::GetInstance()->AddPreTargetHandler(this);
+}
+
+WindowSelectorEventFilter::~WindowSelectorEventFilter() {
+  Shell::GetInstance()->RemovePreTargetHandler(this);
+}
+
+void WindowSelectorEventFilter::OnKeyEvent(ui::KeyEvent* event) {
+  // Views uses VKEY_MENU for both left and right Alt keys.
+  if (event->key_code() == ui::VKEY_MENU &&
+      event->type() == ui::ET_KEY_RELEASED) {
+    Shell::GetInstance()->window_selector_controller()->AltKeyReleased();
+    // Warning: |this| will be deleted from here on.
+  }
+}
+
+}  // namespace
+
+WindowSelectorController::WindowSelectorController() {
+}
+
+WindowSelectorController::~WindowSelectorController() {
+}
+
+// static
+bool WindowSelectorController::CanSelect() {
+  // Don't allow a window overview if the screen is locked or a modal dialog is
+  // open.
+  return !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
+         !Shell::GetInstance()->IsSystemModalWindowOpen();
+}
+
+void WindowSelectorController::ToggleOverview() {
+  if (window_selector_.get()) {
+    window_selector_.reset();
+  } else {
+    std::vector<aura::Window*> windows = ash::Shell::GetInstance()->
+        mru_window_tracker()->BuildMruWindowList();
+    // Don't enter overview mode with no windows.
+    if (windows.empty())
+      return;
+
+    // Deactivating the window will hide popup windows like the omnibar or
+    // open menus.
+    aura::Window* active_window = wm::GetActiveWindow();
+    if (active_window)
+      wm::DeactivateWindow(active_window);
+    window_selector_.reset(
+        new WindowSelector(windows, WindowSelector::OVERVIEW, this));
+  }
+}
+
+void WindowSelectorController::HandleCycleWindow(
+    WindowSelector::Direction direction) {
+  if (!CanSelect())
+    return;
+
+  if (!IsSelecting()) {
+    event_handler_.reset(new WindowSelectorEventFilter());
+    std::vector<aura::Window*> windows = ash::Shell::GetInstance()->
+        mru_window_tracker()->BuildMruWindowList();
+    window_selector_.reset(
+        new WindowSelector(windows, WindowSelector::CYCLE, this));
+    window_selector_->Step(direction);
+  } else if (window_selector_->mode() == WindowSelector::CYCLE) {
+    window_selector_->Step(direction);
+  }
+}
+
+void WindowSelectorController::AltKeyReleased() {
+  event_handler_.reset();
+  window_selector_->SelectWindow();
+}
+
+bool WindowSelectorController::IsSelecting() {
+  return window_selector_.get() != NULL;
+}
+
+void WindowSelectorController::OnWindowSelected(aura::Window* window) {
+  window_selector_.reset();
+  wm::ActivateWindow(window);
+}
+
+void WindowSelectorController::OnSelectionCanceled() {
+  window_selector_.reset();
+}
+
+}  // namespace ash