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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/animation/widget_fade_animator.h"
#include "ui/gfx/animation/linear_animation.h"
#include "ui/views/widget/widget.h"
namespace views {
WidgetFadeAnimator::WidgetFadeAnimator(Widget* widget)
: AnimationDelegateViews(widget->GetRootView()), widget_(widget) {
widget_observation_.Observe(widget);
}
WidgetFadeAnimator::~WidgetFadeAnimator() = default;
void WidgetFadeAnimator::FadeIn() {
if (IsFadingIn()) {
return;
}
DCHECK(widget_);
animation_type_ = FadeType::kFadeIn;
fade_animation_.SetDuration(fade_in_duration_);
// Widgets cannot be shown when visible and fully transparent.
widget_->SetOpacity(0.01f);
widget_->Show();
fade_animation_.Start();
}
void WidgetFadeAnimator::CancelFadeIn() {
if (!IsFadingIn()) {
return;
}
fade_animation_.Stop();
animation_type_ = FadeType::kNone;
}
void WidgetFadeAnimator::FadeOut() {
if (IsFadingOut() || !widget_) {
return;
}
// If the widget is already hidden, then there is no current animation and
// nothing to do. If the animation is close-on-hide, however, we should still
// close the widget.
if (!widget_->IsVisible()) {
DCHECK(!IsFadingIn());
if (close_on_hide_) {
widget_->Close();
}
fade_complete_callbacks_.Notify(this, FadeType::kFadeOut);
return;
}
animation_type_ = FadeType::kFadeOut;
fade_animation_.SetDuration(fade_out_duration_);
fade_animation_.Start();
}
void WidgetFadeAnimator::CancelFadeOut() {
if (!IsFadingOut()) {
return;
}
fade_animation_.Stop();
animation_type_ = FadeType::kNone;
widget_->SetOpacity(1.0f);
}
base::CallbackListSubscription WidgetFadeAnimator::AddFadeCompleteCallback(
FadeCompleteCallback callback) {
return fade_complete_callbacks_.Add(callback);
}
void WidgetFadeAnimator::AnimationProgressed(const gfx::Animation* animation) {
// Get the value of the animation with a material ease applied.
double value =
gfx::Tween::CalculateValue(tween_type_, animation->GetCurrentValue());
float opacity = 0.0f;
if (IsFadingOut()) {
opacity = gfx::Tween::FloatValueBetween(value, 1.0f, 0.0f);
} else if (IsFadingIn()) {
opacity = gfx::Tween::FloatValueBetween(value, 0.0f, 1.0f);
}
if (IsFadingOut() && opacity == 0.0f) {
if (close_on_hide_) {
widget_->Close();
} else {
widget_->Hide();
}
} else {
widget_->SetOpacity(opacity);
}
}
void WidgetFadeAnimator::AnimationEnded(const gfx::Animation* animation) {
const FadeType animation_type = animation_type_;
AnimationProgressed(animation);
animation_type_ = FadeType::kNone;
fade_complete_callbacks_.Notify(this, animation_type);
}
void WidgetFadeAnimator::OnWidgetDestroying(Widget* widget) {
widget_observation_.Reset();
fade_animation_.End();
animation_type_ = FadeType::kNone;
widget_ = nullptr;
}
} // namespace views
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