AppLauncher Touch Feedback

ash/shelf/app_list_button.cc

 // Copyright 2014 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/shelf/app_list_button.h"
 
 #include "ash/ash_constants.h"
 #include "ash/ash_switches.h"
 #include "ash/shelf/shelf_button.h"
 #include "ash/shelf/shelf_button_host.h"
 #include "ash/shelf/shelf_item_types.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
+#include "base/command_line.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_element.h"
 #include "ui/compositor/layer_animation_sequence.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image_skia_operations.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/painter.h"
 
 namespace ash {
 // static
 const int AppListButton::kImageBoundsSize = 7;
 
 
 AppListButton::AppListButton(views::ButtonListener* listener,
                              ShelfButtonHost* host,
                              ShelfWidget* shelf_widget)
     : views::ImageButton(listener),
+      draw_background_as_active_(false),
+      touch_feedback_enabled_(CommandLine::ForCurrentProcess()->
+          HasSwitch(switches::kAshEnableTouchViewTouchFeedback)),
       host_(host),
       shelf_widget_(shelf_widget) {
   SetAccessibleName(l10n_util::GetStringUTF16(IDS_ASH_SHELF_APP_LIST_TITLE));
   SetSize(gfx::Size(kShelfSize, kShelfSize));
   SetFocusPainter(views::Painter::CreateSolidFocusPainter(
                       kFocusBorderColor, gfx::Insets(1, 1, 1, 1)));
 }
 
 AppListButton::~AppListButton() {
 }
@@ skipping 31 matching lines @@
 }
 
 void AppListButton::OnMouseExited(const ui::MouseEvent& event) {
   ImageButton::OnMouseExited(event);
   host_->MouseExitedButton(this);
 }
 
 void AppListButton::OnGestureEvent(ui::GestureEvent* event) {
   switch (event->type()) {
    case ui::ET_GESTURE_SCROLL_BEGIN:
+     if (touch_feedback_enabled_)
+       SetDrawBackgroundAsActive(false);
      host_->PointerPressedOnButton(this, ShelfButtonHost::TOUCH, *event);
      event->SetHandled();
      return;
    case ui::ET_GESTURE_SCROLL_UPDATE:
      host_->PointerDraggedOnButton(this, ShelfButtonHost::TOUCH, *event);
      event->SetHandled();
      return;
    case ui::ET_GESTURE_SCROLL_END:
    case ui::ET_SCROLL_FLING_START:
      host_->PointerReleasedOnButton(this, ShelfButtonHost::TOUCH, false);
      event->SetHandled();
      return;
+   case ui::ET_GESTURE_TAP_DOWN:
+     if (touch_feedback_enabled_)
+       SetDrawBackgroundAsActive(true);
+     ImageButton::OnGestureEvent(event);
+     break;
+   case ui::ET_GESTURE_TAP_CANCEL:
+   case ui::ET_GESTURE_TAP:
+     if (touch_feedback_enabled_)
+       SetDrawBackgroundAsActive(false);
+     ImageButton::OnGestureEvent(event);
+     break;
    default:
      ImageButton::OnGestureEvent(event);
      return;
   }
 }
 
 void AppListButton::OnPaint(gfx::Canvas* canvas) {
   // Call the base class first to paint any background/borders.
   View::OnPaint(canvas);
 
   int background_image_id = 0;
-  if (Shell::GetInstance()->GetAppListTargetVisibility()) {
+  if (Shell::GetInstance()->GetAppListTargetVisibility() ||
+      draw_background_as_active_) {
     background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_PRESSED;
   } else {
     if (shelf_widget_->GetDimsShelf())
       background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_ON_BLACK;
     else
       background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_NORMAL;
   }
   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
   const gfx::ImageSkia* background_image =
       rb.GetImageNamed(background_image_id).ToImageSkia();
@@ skipping 36 matching lines @@
                        forground_bounds.y());
 
   views::Painter::PaintFocusPainter(this, canvas, focus_painter());
 }
 
 void AppListButton::GetAccessibleState(ui::AXViewState* state) {
   state->role = ui::AX_ROLE_BUTTON;
   state->name = host_->GetAccessibleName(this);
 }
 
+void AppListButton::SetDrawBackgroundAsActive(
+    bool draw_background_as_active) {
+  if (draw_background_as_active_ == draw_background_as_active)
+    return;
+  draw_background_as_active_ = draw_background_as_active;
+  SchedulePaint();
+}
+
 }  // namespace ash