[Aura] Refactor and update app list window.

ui/aura_shell/app_list.cc

+// Copyright (c) 2011 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 "ui/aura_shell/app_list.h"
+
+#include "base/bind.h"
+#include "ui/aura/event.h"
+#include "ui/aura/window.h"
+#include "ui/aura_shell/shell.h"
+#include "ui/aura_shell/shell_delegate.h"
+#include "ui/aura_shell/shell_window_ids.h"
+#include "ui/gfx/screen.h"
+
+namespace aura_shell {
+namespace internal {
+
+namespace {
+
+// Gets preferred bounds of app list window in show/hide state.
+gfx::Rect GetPreferredBounds(bool show) {
+  // The y-axis offset used at the beginning of showing animation.
+  static const int kMoveUpAnimationOffset = 50;
+
+  gfx::Point cursor = gfx::Screen::GetCursorScreenPoint();
+  gfx::Rect work_area = gfx::Screen::GetMonitorWorkAreaNearestPoint(cursor);
+  gfx::Rect widget_bounds(work_area);
+  widget_bounds.Inset(150, 100);
+  if (!show)
+    widget_bounds.Offset(0, kMoveUpAnimationOffset);
+
+  return widget_bounds;
+}
+
+ui::Layer* GetLayer(views::Widget* widget) {
+  return widget->GetNativeView()->layer();
+}
+
+}  // namespace
+
+////////////////////////////////////////////////////////////////////////////////
+// AppList, public:
+
+AppList::AppList()
+    : aura::EventFilter(NULL),
+      is_visible_(false),
+      widget_(NULL),
+      ALLOW_THIS_IN_INITIALIZER_LIST(set_widget_factory_(this)) {
+}
+
+AppList::~AppList() {
+  ResetWidget();
+}
+
+void AppList::SetVisible(bool visible) {
+  if (visible == is_visible_)
+    return;
+
+  is_visible_ = visible;
+
+  if (widget_) {
+    ScheduleAnimation();
+  } else if (is_visible_ && !set_widget_factory_.HasWeakPtrs()) {
+    Shell::GetInstance()->delegate()->RequestAppListWidget(
+        base::Bind(&AppList::SetWidget, set_widget_factory_.GetWeakPtr()));
+  }
+}
+
+bool AppList::IsVisible() {
+  return widget_ && widget_->IsVisible();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AppList, private:
+
+void AppList::SetWidget(views::Widget* widget) {
+  DCHECK(widget_ == NULL);
+  set_widget_factory_.InvalidateWeakPtrs();
+
+  if (is_visible_) {
+    widget_ = widget;
+    widget_->AddObserver(this);
+    GetLayer(widget_)->GetAnimator()->AddObserver(this);
+    Shell::GetInstance()->AddDesktopEventFilter(this);
+
+    widget_->SetBounds(GetPreferredBounds(false));
+    widget_->SetOpacity(0);
+    ScheduleAnimation();
+
+    widget_->Show();
+    widget_->Activate();
+  } else {
+    widget->Close();
+  }
+}
+
+void AppList::ResetWidget() {
+  if (!widget_)
+    return;
+
+  widget_->RemoveObserver(this);
+  GetLayer(widget_)->GetAnimator()->RemoveObserver(this);
+  Shell::GetInstance()->RemoveDesktopEventFilter(this);
+  widget_ = NULL;
+}
+
+void AppList::ScheduleAnimation() {
+  ui::Layer* layer = GetLayer(widget_);
+  ui::LayerAnimator::ScopedSettings app_list_animation(layer->GetAnimator());
+  layer->SetBounds(GetPreferredBounds(is_visible_));
+  layer->SetOpacity(is_visible_ ? 1.0 : 0.0);
+
+  ui::Layer* default_container_layer = Shell::GetInstance()->GetContainer(
+      internal::kShellWindowId_DefaultContainer)->layer();
+  ui::LayerAnimator::ScopedSettings default_container_animation(
+      default_container_layer->GetAnimator());
+  default_container_layer->SetOpacity(is_visible_ ? 0.0 : 1.0);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AppList, aura::EventFilter implementation:
+
+bool AppList::PreHandleKeyEvent(aura::Window* target,
+                                aura::KeyEvent* event) {
+  return false;
+}
+
+bool AppList::PreHandleMouseEvent(aura::Window* target,
+                                 aura::MouseEvent* event) {
+  if (widget_ && is_visible_ && event->type() == ui::ET_MOUSE_PRESSED) {
+    aura::MouseEvent translated(*event, target, widget_->GetNativeView());
+    if (!widget_->GetNativeView()->ContainsPoint(translated.location()))
+      SetVisible(false);
+  }
+  return false;
+}
+
+ui::TouchStatus AppList::PreHandleTouchEvent(aura::Window* target,
+                                             aura::TouchEvent* event) {
+  return ui::TOUCH_STATUS_UNKNOWN;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AppList, ui::LayerAnimationObserver implementation:
+
+void AppList::OnLayerAnimationEnded(
+    const ui::LayerAnimationSequence* sequence) {
+  if (!is_visible_ )
+    widget_->Close();
+}
+
+void AppList::OnLayerAnimationAborted(
+    const ui::LayerAnimationSequence* sequence) {
+}
+
+void AppList::OnLayerAnimationScheduled(
+    const ui::LayerAnimationSequence* sequence) {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AppList, views::Widget::Observer implementation:
+
+void AppList::OnWidgetClosing(views::Widget* widget) {
+  DCHECK(widget_ == widget);
+  ResetWidget();
+}
+
+void AppList::OnWidgetActivationChanged(views::Widget* widget, bool active) {
+  DCHECK(widget_ == widget);
+  if (widget_ && is_visible_ && !active)
+    SetVisible(false);
+}
+
+}  // namespace internal
+}  // namespace aura_shell