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// Copyright (c) 2012 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_VIEWS_CONTROLS_THROBBER_H_
#define UI_VIEWS_CONTROLS_THROBBER_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "ui/views/view.h"
namespace gfx {
class ImageSkia;
}
namespace views {
// Throbbers display an animation, usually used as a status indicator.
class VIEWS_EXPORT Throbber : public View {
public:
Throbber();
~Throbber() override;
// Start and stop the throbber animation.
virtual void Start();
virtual void Stop();
// Stop spinning and, if checked is true, display a checkmark.
void SetChecked(bool checked);
// Overridden from View:
gfx::Size GetPreferredSize() const override;
void OnPaint(gfx::Canvas* canvas) override;
protected:
// Specifies whether the throbber is currently animating or not
bool IsRunning() const;
private:
base::TimeTicks start_time_; // Time when Start was called.
base::RepeatingTimer<Throbber> timer_; // Used to schedule Run calls.
// Whether or not we should display a checkmark.
bool checked_;
// The checkmark image. Will be null until it's used (if ever).
const gfx::ImageSkia* checkmark_;
DISALLOW_COPY_AND_ASSIGN(Throbber);
};
// A SmoothedThrobber is a throbber that is representing potentially short
// and nonoverlapping bursts of work. SmoothedThrobber ignores small
// pauses in the work stops and starts, and only starts its throbber after
// a small amount of work time has passed.
class VIEWS_EXPORT SmoothedThrobber : public Throbber {
public:
SmoothedThrobber();
~SmoothedThrobber() override;
void Start() override;
void Stop() override;
void set_start_delay_ms(int value) { start_delay_ms_ = value; }
void set_stop_delay_ms(int value) { stop_delay_ms_ = value; }
private:
// Called when the startup-delay timer fires
// This function starts the actual throbbing.
void StartDelayOver();
// Called when the shutdown-delay timer fires.
// This function stops the actual throbbing.
void StopDelayOver();
// Delay after work starts before starting throbber, in milliseconds.
int start_delay_ms_;
// Delay after work stops before stopping, in milliseconds.
int stop_delay_ms_;
base::OneShotTimer<SmoothedThrobber> start_timer_;
base::OneShotTimer<SmoothedThrobber> stop_timer_;
DISALLOW_COPY_AND_ASSIGN(SmoothedThrobber);
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_THROBBER_H_
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