mash: Add touch-hud app.

ash/touch_hud/mus/touch_hud_application.cc

+// Copyright 2016 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/touch_hud/mus/touch_hud_application.h"
+
+#include "ash/public/interfaces/container.mojom.h"
+#include "ash/touch_hud/touch_hud_renderer.h"
+#include "base/macros.h"
+#include "base/strings/utf_string_conversions.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "services/shell/public/cpp/connector.h"
+#include "services/ui/public/cpp/property_type_converters.h"
+#include "services/ui/public/interfaces/window_manager_constants.mojom.h"
+#include "ui/views/mus/aura_init.h"
+#include "ui/views/mus/native_widget_mus.h"
+#include "ui/views/mus/window_manager_connection.h"
+#include "ui/views/touch_event_watcher.h"
+#include "ui/views/widget/widget.h"
+#include "ui/views/widget/widget_delegate.h"
+
+namespace ash {
+namespace touch_hud {
+
+// TouchHudUI handles events on the widget of the touch-hud app. After
+// receiving touch events from ui::WindowManagerConnection, it calls
+// ash::TouchHudRenderer to draw out touch points.
+class TouchHudUI : public views::WidgetDelegateView,
+                   public views::TouchEventWatcher {
+ public:
+  TouchHudUI(views::WindowManagerConnection* window_manager_connection,
+             views::Widget* widget)
+      : window_manager_connection_(window_manager_connection),
+        widget_(widget),
+        touch_hud_renderer_(new TouchHudRenderer(widget_)) {
+    window_manager_connection_->AddTouchEventWatcher(this);
+  }
+  ~TouchHudUI() override {
+    window_manager_connection_->RemoveTouchEventWatcher(this);
+  }
+
+ private:
+  // Overridden from views::WidgetDelegate:
+  views::View* GetContentsView() override { return this; }
+  base::string16 GetWindowTitle() const override {
+    // TODO(beng): use resources.
+    return base::ASCIIToUTF16("TouchHud");
+  }
+
+  // Overridden from views::TouchEventWatcher:
+  void OnTouchEventObserved(const ui::LocatedEvent& event,
+                            views::Widget* target) override {
+    touch_hud_renderer_->HandleTouchEvent(event);
+  }
+
+  views::WindowManagerConnection* window_manager_connection_;
+  views::Widget* widget_;
+  TouchHudRenderer* touch_hud_renderer_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchHudUI);
+};
+
+TouchHudApplication::TouchHudApplication() {}
+TouchHudApplication::~TouchHudApplication() {}
+
+void TouchHudApplication::OnStart(shell::Connector* connector,
+                                  const shell::Identity& identity,
+                                  uint32_t id) {
+  connector_ = connector;
+  tracing_.Initialize(connector, identity.name());
+
+  aura_init_.reset(new views::AuraInit(connector, "views_mus_resources.pak"));
+
+  window_manager_connection_ =
+      views::WindowManagerConnection::Create(connector, identity);
+}
+
+bool TouchHudApplication::OnConnect(shell::Connection* connection) {
+  connection->AddInterface<mash::mojom::Launchable>(this);
+  return true;
+}
+
+void TouchHudApplication::Launch(uint32_t what, mash::mojom::LaunchMode how) {
+  if (!widget_) {
+    // If the keyboard shortcut for enabling touch-hud app is used.

[sadrul, 2016/07/15 15:01:10]

Remove the comment.

[riajiang, 2016/07/15 17:01:27]

Done.

+    widget_ = new views::Widget;
+    views::Widget::InitParams params(
+        views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
+    params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
+    params.activatable = views::Widget::InitParams::ACTIVATABLE_NO;
+    params.accept_events = false;
+    params.delegate =
+        new TouchHudUI(views::WindowManagerConnection::Get(), widget_);

[sadrul, 2016/07/15 15:01:11]

window_manager_connection_.get()

[riajiang, 2016/07/15 17:01:27]

Done.

+
+    std::map<std::string, std::vector<uint8_t>> properties;
+    properties[ash::mojom::kWindowContainer_Property] =
+        mojo::ConvertTo<std::vector<uint8_t>>(
+            static_cast<int32_t>(ash::mojom::Container::OVERLAY));
+    properties[ui::mojom::WindowManager::kShowState_Property] =
+        mojo::ConvertTo<std::vector<uint8_t>>(
+            static_cast<int32_t>(ui::mojom::ShowState::FULLSCREEN));
+    ui::Window* window =
+        views::WindowManagerConnection::Get()->NewWindow(properties);
+    params.native_widget = new views::NativeWidgetMus(
+        widget_, connector_, window, ui::mojom::SurfaceType::DEFAULT);
+    widget_->Init(params);
+    widget_->Show();
+  } else {
+    // If the keyboard shortcut for disabling touch-hud app is used.
+    widget_->Close();
+    widget_ = nullptr;

[sadrul, 2016/07/15 15:01:10]

Does this app terminate when the widget is closed? Because we should do that.

[riajiang, 2016/07/15 17:01:27]

Added QuitWhenIdle() after closing the widget.

+  }
+}
+
+void TouchHudApplication::Create(shell::Connection* connection,
+                                 mash::mojom::LaunchableRequest request) {
+  bindings_.AddBinding(this, std::move(request));
+}
+
+}  // namespace touch_hud
+}  // namespace ash