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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_VIEWS_REPEAT_CONTROLLER_H_
#define UI_VIEWS_REPEAT_CONTROLLER_H_
#include "base/functional/callback.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "ui/views/views_export.h"
namespace base {
class TickClock;
}
namespace views {
///////////////////////////////////////////////////////////////////////////////
//
// RepeatController
//
// An object that handles auto-repeating UI actions. There is a longer initial
// delay after which point repeats become constant. Users provide a callback
// that is notified when each repeat occurs so that they can perform the
// associated action.
//
///////////////////////////////////////////////////////////////////////////////
class VIEWS_EXPORT RepeatController {
public:
explicit RepeatController(base::RepeatingClosure callback,
const base::TickClock* tick_clock = nullptr);
RepeatController(const RepeatController&) = delete;
RepeatController& operator=(const RepeatController&) = delete;
virtual ~RepeatController();
// Start repeating.
void Start();
// Stop repeating.
void Stop();
static constexpr base::TimeDelta GetInitialWaitForTesting() {
return kInitialWait;
}
static constexpr base::TimeDelta GetRepeatingWaitForTesting() {
return kRepeatingWait;
}
const base::OneShotTimer& timer_for_testing() const { return timer_; }
private:
// Initial time required before the first callback occurs.
static constexpr base::TimeDelta kInitialWait = base::Milliseconds(250);
// Period of callbacks after the first callback.
static constexpr base::TimeDelta kRepeatingWait = base::Milliseconds(50);
// Called when the timer expires.
void Run();
// The current timer.
base::OneShotTimer timer_;
base::RepeatingClosure callback_;
};
} // namespace views
#endif // UI_VIEWS_REPEAT_CONTROLLER_H_
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