Implement an indeterminate progress-bar

ui/message_center/views/notification_progress_bar.h

+// Copyright 2015 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 UI_MESSAGE_CENTER_VIEWS_NOTIFICATION_PROGRESS_BAR_H_
+#define UI_MESSAGE_CENTER_VIEWS_NOTIFICATION_PROGRESS_BAR_H_
+
+#include "base/macros.h"
+#include "ui/gfx/animation/animation_delegate.h"
+#include "ui/gfx/animation/linear_animation.h"
+#include "ui/message_center/message_center_export.h"
+#include "ui/views/controls/progress_bar.h"
+
+namespace message_center {
+
+class MESSAGE_CENTER_EXPORT NotificationProgressBarBase
+    : public views::ProgressBar {
+ public:
+  virtual bool is_indeterminate() = 0;
+
+ private:
+  // Overriden from views::ProgressBar (originally from views::View)
+  gfx::Size GetPreferredSize() const override;
+};
+
+class MESSAGE_CENTER_EXPORT NotificationProgressBar
+    : public NotificationProgressBarBase {
+ public:
+  NotificationProgressBar();
+  ~NotificationProgressBar() override;
+
+  bool is_indeterminate() override;
+
+ private:
+  // Overriden from views::ProgressBar (originally from views::View)
+  void OnPaint(gfx::Canvas* canvas) override;
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationProgressBar);
+};
+
+class MESSAGE_CENTER_EXPORT NotificationIndeterminateProgressBar
+    : public NotificationProgressBarBase, public gfx::AnimationDelegate {
+ public:
+  NotificationIndeterminateProgressBar();
+  ~NotificationIndeterminateProgressBar() override;
+
+  bool is_indeterminate() override;
+
+ private:
+  // Overriden from views::ProgressBar (originally from views::View)
+  void OnPaint(gfx::Canvas* canvas) override;
+
+  // Overriden from gfx::AnimationDelegate
+  void AnimationProgressed(const gfx::Animation* animation) override;
+  void AnimationEnded(const gfx::Animation* animation) override;
+
+  scoped_ptr<gfx::LinearAnimation> indeterminate_bar_animation_;
+
+  DISALLOW_COPY_AND_ASSIGN(NotificationIndeterminateProgressBar);
+};
+
+}  // namespace message_center
+
+#endif  // UI_MESSAGE_CENTER_VIEWS_NOTIFICATION_PROGRESS_BAR_H_