Remove TransparentActivateWindowButton from Overview Mode

ash/wm/overview/transparent_activate_window_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/wm/overview/transparent_activate_window_button.h"
-
-#include <vector>
-
-#include "ash/shell.h"
-#include "ash/shell_window_ids.h"
-#include "ash/wm/overview/transparent_activate_window_button_delegate.h"
-#include "ui/events/event.h"
-#include "ui/events/gesture_event_details.h"
-#include "ui/gfx/display.h"
-#include "ui/gfx/screen.h"
-#include "ui/views/controls/button/button.h"
-#include "ui/views/controls/button/custom_button.h"
-#include "ui/views/widget/widget.h"
-
-namespace ash {
-
-namespace {
-const char kTransparentButtonName[] = "TransparentButton";
-
-// Transparent button that handles events to activate or close windows in
-// overview mode.
-class TransparentButton
-    : public views::CustomButton,
-      public views::ButtonListener {
- public:
-  explicit TransparentButton(TransparentActivateWindowButtonDelegate* delegate);
-
-  ~TransparentButton() override;
-
-  TransparentActivateWindowButtonDelegate* delegate() { return delegate_; }
-
-  // views::View:
-  void OnGestureEvent(ui::GestureEvent* event) override;
-
-  const char* GetClassName() const override { return kTransparentButtonName; }
-
-  // views::ButtonListener:
-  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
-
- private:
-  TransparentActivateWindowButtonDelegate* delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(TransparentButton);
-};
-
-TransparentButton::TransparentButton(
-        TransparentActivateWindowButtonDelegate* delegate)
-    : CustomButton(this),
-      delegate_(delegate) {
-}
-
-TransparentButton::~TransparentButton() {
-}
-
-void TransparentButton::OnGestureEvent(ui::GestureEvent* event) {
-  // TODO(tdanderson): Re-evaluate whether we want to set capture once
-  //                   the a fix has landed to avoid crashing when a window
-  //                   having an active gesture sequence is destroyed as a
-  //                   result of a gesture in a separate window. Consider using
-  //                   a StaticWindowTargeter instead of a transparent overlay
-  //                   widget to re-direct input events.
-  if (event->type() == ui::ET_GESTURE_TAP_DOWN)
-    GetWidget()->SetCapture(this);
-
-  if (event->type() == ui::ET_GESTURE_TAP ||
-      event->type() == ui::ET_GESTURE_END) {
-    GetWidget()->ReleaseCapture();
-  }
-
-  CustomButton::OnGestureEvent(event);
-  event->StopPropagation();
-}
-
-void TransparentButton::ButtonPressed(views::Button* sender,
-                                      const ui::Event& event) {
-  delegate_->Select();
-}
-
-// Initializes the event handler transparent window.
-views::Widget* InitEventHandler(aura::Window* root_window) {
-  views::Widget* widget = new views::Widget;
-  views::Widget::InitParams params;
-  params.type = views::Widget::InitParams::TYPE_POPUP;
-  params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
-  params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
-  params.accept_events = true;
-  params.parent = Shell::GetContainer(root_window,
-                                      kShellWindowId_OverlayContainer);
-  widget->set_focus_on_creation(false);
-  widget->Init(params);
-  widget->Show();
-
-  aura::Window* handler = widget->GetNativeWindow();
-  handler->parent()->StackChildAtBottom(handler);
-
-  return widget;
-}
-
-}  // namespace
-
-TransparentActivateWindowButton::TransparentActivateWindowButton(
-        aura::Window* root_window,
-        TransparentActivateWindowButtonDelegate* delegate)
-    : event_handler_widget_(InitEventHandler(root_window)),
-      transparent_button_(new TransparentButton(delegate)) {
-  event_handler_widget_->SetContentsView(transparent_button_);
-}
-
-TransparentActivateWindowButton::~TransparentActivateWindowButton() {
-}
-
-void TransparentActivateWindowButton::SetAccessibleName(
-    const base::string16& name) {
-  transparent_button_->SetAccessibleName(name);
-}
-
-void TransparentActivateWindowButton::SetBounds(const gfx::Rect& bounds) {
-  aura::Window* window = event_handler_widget_->GetNativeWindow();
-  const gfx::Display& display = gfx::Screen::GetScreenFor(
-      window)->GetDisplayNearestWindow(window);
-  // Explicitly specify the display so that the window doesn't change root
-  // windows and cause the z-order of the transparent overlays to be updated.
-  window->SetBoundsInScreen(bounds, display);
-}
-
-void TransparentActivateWindowButton::SendFocusAlert() const {
-  event_handler_widget_->GetContentsView()->
-      NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true);
-}
-
-void TransparentActivateWindowButton::StackAbove(
-    TransparentActivateWindowButton* activate_button) {
-  aura::Window* this_window = event_handler_widget_->GetNativeWindow();
-  aura::Window* other_window = activate_button->event_handler_widget_->
-      GetNativeWindow();
-  this_window->parent()->StackChildAbove(this_window, other_window);
-}
-
-}  // namespace ash