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138 lines
3.4 KiB
138 lines
3.4 KiB
using System;
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using UnityEngine;
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using UnityEngine.EventSystems;
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public class AnimatedBiStateButton : MonoBehaviour,
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IPointerDownHandler, IPointerUpHandler,
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IPointerEnterHandler, IPointerExitHandler
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{
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public enum State
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{
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Up,
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AnimateDown,
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Down,
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AnimateUp,
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}
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public float animationDuration = .1f;
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public AnimationCurve animationCurve = AnimationCurve.EaseInOut(0, 0, 1, 1);
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public bool useEnterExitEvents = true;
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public event Action willPress;
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public event Action willRelease;
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protected State state = State.Up;
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/// <summary>
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/// 0 = fully up
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/// 1 = fully down
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/// </summary>
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protected float pressAmount = 0;
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protected bool IsAnimating => state == State.AnimateDown || state == State.AnimateUp;
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void Update()
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{
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PollPointerUp();
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DoAnimation();
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}
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void DoAnimation()
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{
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if (!IsAnimating) return;
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if (state == State.AnimateDown)
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{
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pressAmount += Time.deltaTime / animationDuration;
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}
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else if (state == State.AnimateUp)
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{
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pressAmount -= Time.deltaTime / animationDuration;
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}
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pressAmount = Mathf.Clamp01(pressAmount);
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var animationProgress = pressAmount;
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if (state == State.AnimateUp) animationProgress = 1 - animationProgress;
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animationProgress = animationCurve.Evaluate(animationProgress);
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if (state == State.AnimateUp) animationProgress = 1 - animationProgress;
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Animate(animationProgress);
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if (state == State.AnimateDown && pressAmount == 1)
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{
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state = State.Down;
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}
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if (state == State.AnimateUp && pressAmount == 0)
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{
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state = State.Up;
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}
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}
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protected void Press()
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{
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if (state != State.Down && state != State.AnimateDown)
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{
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OnWillPress();
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state = State.AnimateDown;
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}
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}
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protected void Release()
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{
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if (state != State.Up && state != State.AnimateUp)
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{
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OnWillRelease();
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state = State.AnimateUp;
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}
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}
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/// <summary>
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/// Pointer Up event does not fire on an object if it was not the one receive the Pointer Down event.
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/// </summary>
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void PollPointerUp()
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{
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if (useEnterExitEvents
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&& (state == State.Down || state == State.AnimateDown)
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&& !Input.GetMouseButton(0))
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{
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Release();
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}
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}
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/// <summary>
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/// NOP if not overrided
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/// </summary>
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/// <param name="visualPressAmount"><see cref="pressAmount"/> conformed to <see cref="animationCurve"/></param>
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protected virtual void Animate(float visualPressAmount) { }
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public void OnPointerDown(PointerEventData eventData)
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{
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Press();
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}
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public void OnPointerUp(PointerEventData eventData)
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{
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Release();
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}
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public void OnPointerEnter(PointerEventData eventData)
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{
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if (useEnterExitEvents && Input.GetMouseButton(0)) Press();
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}
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public void OnPointerExit(PointerEventData eventData)
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{
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if (useEnterExitEvents) Release();
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}
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protected virtual void OnWillPress()
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{
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willPress?.Invoke();
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}
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protected virtual void OnWillRelease()
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{
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willRelease?.Invoke();
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}
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}
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