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// Copyright 2013 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_COMPOSITOR_SCOPED_ANIMATION_DURATION_SCALE_MODE_H_
#define UI_COMPOSITOR_SCOPED_ANIMATION_DURATION_SCALE_MODE_H_
#include "ui/compositor/compositor_export.h"
namespace ui {
// Speed up or slow down animations for testing or debugging.
class COMPOSITOR_EXPORT ScopedAnimationDurationScaleMode {
public:
// Anumation duration multipliers.
static constexpr float NORMAL_DURATION = 1.0;
static constexpr float FAST_DURATION = 1.0 / 4; // 4 times faster
static constexpr float SLOW_DURATION = 1.0 * 4.0; // 4 times slower
// A very short but guaranteed non-zero duration for individual tests that
// need to assert things about animations after creating them.
static constexpr float NON_ZERO_DURATION = 1.0 / 20; // 20 times faster
// Animations complete immediately after being created. Used by most tests.
static constexpr float ZERO_DURATION = 0;
explicit ScopedAnimationDurationScaleMode(float scoped_multiplier);
ScopedAnimationDurationScaleMode(const ScopedAnimationDurationScaleMode&) =
delete;
ScopedAnimationDurationScaleMode& operator=(
const ScopedAnimationDurationScaleMode&) = delete;
~ScopedAnimationDurationScaleMode();
static float duration_multiplier() { return duration_multiplier_; }
static bool is_zero() { return duration_multiplier_ == ZERO_DURATION; }
private:
// This is stored previous multiplier version to restore after scoped scale
// destruction.
const float old_duration_multiplier_;
// This is active global multiplier.
static float duration_multiplier_;
};
} // namespace ui
#endif // UI_COMPOSITOR_SCOPED_ANIMATION_DURATION_SCALE_MODE_H_
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