Ash: Implement Toasts

ash/system/toast/toast_overlay.h

+// 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.
+
+#ifndef ASH_SYSTEM_TOAST_TOAST_OVERLAY_H_
+#define ASH_SYSTEM_TOAST_TOAST_OVERLAY_H_
+
+#include "ash/ash_export.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/compositor/layer_animation_observer.h"
+#include "ui/events/event_constants.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace views {
+class Widget;
+}
+
+namespace ash {
+
+class ToastOverlayView;
+class ToastOverlayButton;
+
+class ASH_EXPORT ToastOverlay : public ui::LayerAnimationObserver {
+ public:
+  class Delegate {
+   public:
+    virtual void OnClosed() = 0;
+  };
+
+  ToastOverlay(Delegate* delegate, const std::string& text);
+  ~ToastOverlay() override;
+
+  // Shows or hides the overlay.
+  void Show(bool visible);
+
+ private:
+  // Returns the current bounds of the overlay, which is based on visibility.
+  gfx::Rect CalculateOverlayBounds();
+
+  // gfx::LayerAnimationObserver overrides:
+  void OnLayerAnimationEnded(ui::LayerAnimationSequence* sequence) override;
+  void OnLayerAnimationAborted(ui::LayerAnimationSequence* sequence) override;
+  void OnLayerAnimationScheduled(ui::LayerAnimationSequence* sequence) override;
+
+  bool is_visible_ = false;
+  Delegate* const delegate_;
+  scoped_ptr<views::Widget> overlay_widget_;
+  scoped_ptr<ToastOverlayView> overlay_view_;
+  gfx::Size widget_size_;
+
+  DISALLOW_COPY_AND_ASSIGN(ToastOverlay);
+};
+
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_TOAST_TOAST_OVERLAY_H_