Add double click and tap handler to minimize attached panels.

ash/wm/panels/panel_window_event_handler.cc

Index: ash/wm/panels/panel_window_event_handler.cc
diff --git a/ash/wm/panels/panel_window_event_handler.cc b/ash/wm/panels/panel_window_event_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..361b464e0f9fe2b90ec7cab180e1efdab9dc1f37
--- /dev/null
+++ b/ash/wm/panels/panel_window_event_handler.cc
@@ -0,0 +1,49 @@
+// Copyright (c) 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/panels/panel_window_event_handler.h"
+
+#include "ui/aura/client/aura_constants.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_delegate.h"
+#include "ui/base/events/event.h"
+#include "ui/base/hit_test.h"
+
+namespace ash {
+namespace internal {
+
+PanelWindowEventHandler::PanelWindowEventHandler(aura::Window* owner)
+    : ToplevelWindowEventHandler(owner) {
+}
+
+PanelWindowEventHandler::~PanelWindowEventHandler() {
+}
+
+void PanelWindowEventHandler::OnMouseEvent(ui::MouseEvent* event) {
+  aura::Window* target = static_cast<aura::Window*>(event->target());
+  if (event->type() == ui::ET_MOUSE_PRESSED &&
+      event->flags() & ui::EF_IS_DOUBLE_CLICK &&
+      target->delegate()->GetNonClientComponent(event->location()) ==
+          HTCAPTION) {
+    target->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MINIMIZED);
+    return;
+  }
+  ToplevelWindowEventHandler::OnMouseEvent(event);
+}
+
+void PanelWindowEventHandler::OnGestureEvent(ui::GestureEvent* event) {
+  aura::Window* target = static_cast<aura::Window*>(event->target());
+  if (event->type() == ui::ET_GESTURE_TAP &&
+      event->details().tap_count() == 2 &&
+      target->delegate()->GetNonClientComponent(event->location()) ==
+          HTCAPTION) {
+    target->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MINIMIZED);
+    event->StopPropagation();
+    return;
+  }
+  ToplevelWindowEventHandler::OnGestureEvent(event);
+}
+
+}  // namespace internal
+}  // namespace ash