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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_GFX_ANIMATION_SLIDE_ANIMATION_H_
#define UI_GFX_ANIMATION_SLIDE_ANIMATION_H_
#include "base/macros.h"
#include "ui/gfx/animation/linear_animation.h"
#include "ui/gfx/animation/tween.h"
namespace gfx {
// Slide Animation
//
// Used for reversible animations and as a general helper class. Typical usage:
//
// #include "ui/gfx/animation/slide_animation.h"
//
// class MyClass : public AnimationDelegate {
// public:
// MyClass() {
// animation_.reset(new SlideAnimation(this));
// animation_->SetSlideDuration(500);
// }
// void OnMouseOver() {
// animation_->Show();
// }
// void OnMouseOut() {
// animation_->Hide();
// }
// void AnimationProgressed(const Animation* animation) {
// if (animation == animation_.get()) {
// Layout();
// SchedulePaint();
// } else if (animation == other_animation_.get()) {
// ...
// }
// }
// void Layout() {
// if (animation_->is_animating()) {
// hover_image_.SetOpacity(animation_->GetCurrentValue());
// }
// }
// private:
// std::unique_ptr<SlideAnimation> animation_;
// }
class ANIMATION_EXPORT SlideAnimation : public LinearAnimation {
public:
explicit SlideAnimation(AnimationDelegate* target);
~SlideAnimation() override;
// Set the animation back to the 0 state.
virtual void Reset();
virtual void Reset(double value);
// Begin a showing animation or reverse a hiding animation in progress.
// Animates |GetCurrentValue()| towards 1.
virtual void Show();
// Begin a hiding animation or reverse a showing animation in progress.
// Animates |GetCurrentValue()| towards 0.
virtual void Hide();
// Sets the time a slide will take. Note that this isn't actually
// the amount of time an animation will take as the current value of
// the slide is considered.
virtual void SetSlideDuration(int duration);
int GetSlideDuration() const { return slide_duration_; }
void SetTweenType(Tween::Type tween_type) { tween_type_ = tween_type; }
// Dampens the reduction in duration for an animation which starts partway.
// The default value of 1 has no effect.
void SetDampeningValue(double dampening_value);
double GetCurrentValue() const override;
// TODO(bruthig): Fix IsShowing() and IsClosing() to be consistent. e.g.
// IsShowing() will currently return true after the 'show' animation has been
// completed however IsClosing() will return false after the 'hide' animation
// has been completed.
bool IsShowing() const { return showing_; }
bool IsClosing() const { return !showing_ && value_end_ < value_current_; }
class TestApi;
private:
// Gets the duration based on the dampening factor and whether the animation
// is showing or hiding.
base::TimeDelta GetDuration();
// Overridden from Animation.
void AnimateToState(double state) override;
AnimationDelegate* target_;
Tween::Type tween_type_;
// Used to determine which way the animation is going.
bool showing_;
// Animation values. These are a layer on top of Animation::state_ to
// provide the reversability.
double value_start_;
double value_end_;
double value_current_;
// How long a hover in/out animation will last for. This defaults to
// kHoverFadeDurationMS, but can be overridden with SetDuration.
int slide_duration_;
// Dampens the reduction in duration for animations which start partway.
double dampening_value_;
DISALLOW_COPY_AND_ASSIGN(SlideAnimation);
};
} // namespace gfx
#endif // UI_GFX_ANIMATION_SLIDE_ANIMATION_H_
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