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65 lines
1.9 KiB
65 lines
1.9 KiB
5 years ago
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using Unity.UIWidgets.foundation;
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using Unity.UIWidgets.ui;
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namespace Unity.UIWidgets.animation {
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public enum AnimationStatus {
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dismissed,
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forward,
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reverse,
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completed,
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}
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public delegate void AnimationStatusListener(AnimationStatus status);
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public abstract class Animation<T> : ValueListenable<T> {
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public abstract void addListener(VoidCallback listener);
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public abstract void removeListener(VoidCallback listener);
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public abstract void addStatusListener(AnimationStatusListener listener);
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public abstract void removeStatusListener(AnimationStatusListener listener);
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public abstract AnimationStatus status { get; }
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public abstract T value { get; }
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public bool isDismissed {
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get { return this.status == AnimationStatus.dismissed; }
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}
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public bool isCompleted {
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get { return this.status == AnimationStatus.completed; }
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}
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public override string ToString() {
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return $"{Diagnostics.describeIdentity(this)}({this.toStringDetails()})";
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}
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public virtual string toStringDetails() {
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string icon = null;
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switch (this.status) {
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case AnimationStatus.forward:
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icon = "\u25B6"; // >
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break;
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case AnimationStatus.reverse:
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icon = "\u25C0"; // <
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break;
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case AnimationStatus.completed:
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icon = "\u23ED"; // >>|
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break;
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case AnimationStatus.dismissed:
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icon = "\u23EE"; // |<<
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break;
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}
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D.assert(icon != null);
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return icon;
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}
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public Animation<U> drive<U>(Animatable<U> child) {
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D.assert(this is Animation<float>);
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return child.animate(this as Animation<float>);
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}
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}
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}
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