112 lines
3.3 KiB
C#
112 lines
3.3 KiB
C#
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using Pixelplacement;
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using UnityEngine;
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namespace UI
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{
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/// <summary>
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/// Adds a CanvasGroup (if missing) and plays a continuous blinking tween on its alpha.
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/// Attach to any GameObject to make it pulse/fade in and out.
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/// </summary>
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[DisallowMultipleComponent]
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[RequireComponent(typeof(CanvasGroup))]
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public class BlinkingCanvasGroup : MonoBehaviour
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{
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[Header("Blink Settings")] [Tooltip("Minimum alpha value during blink")] [Range(0f, 1f)]
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public float minAlpha;
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[Tooltip("Maximum alpha value during blink")] [Range(0f, 1f)]
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public float maxAlpha = 1f;
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[Tooltip("Duration of one leg (min->max or max->min)")]
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public float legDuration = 0.5f;
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[Tooltip("Delay before starting the blinking")]
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public float startDelay;
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[Tooltip("Whether the tween should obey Time.timeScale (false = unscaled)")]
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public bool obeyTimescale;
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[Tooltip("Optional animation curve for easing. Leave null for default ease in/out.")]
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public AnimationCurve easeCurve;
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// Internal
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private CanvasGroup _canvasGroup;
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private Pixelplacement.TweenSystem.TweenBase _activeTween;
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void Awake()
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{
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// Ensure we have a CanvasGroup
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_canvasGroup = GetComponent<CanvasGroup>();
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if (_canvasGroup == null)
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{
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_canvasGroup = gameObject.AddComponent<CanvasGroup>();
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}
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// Ensure starting alpha
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_canvasGroup.alpha = minAlpha;
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}
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void Start()
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{
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StartBlinking();
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}
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void OnEnable()
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{
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// If re-enabled, ensure tween is running
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if (_activeTween == null)
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StartBlinking();
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}
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void OnDisable()
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{
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StopBlinking();
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}
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void OnDestroy()
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{
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StopBlinking();
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}
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/// <summary>
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/// Start the continuous blinking tween.
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/// </summary>
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public void StartBlinking()
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{
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StopBlinking();
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if (_canvasGroup == null) return;
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// Use PingPong-like behavior by chaining two opposite legs with LoopType.Loop
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// Simpler: Tween.CanvasGroupAlpha has an overload that sets startAlpha then end.
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// We'll tween min->max then set LoopType.PingPong if available. The API supports LoopType.PingPong.
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// Start from minAlpha to maxAlpha
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_canvasGroup.alpha = minAlpha;
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// Use the Tween.Value overload for float with obeyTimescale parameter
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_activeTween = Tween.Value(minAlpha, maxAlpha, v => _canvasGroup.alpha = v, legDuration, startDelay,
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easeCurve ?? Tween.EaseInOut, Tween.LoopType.PingPong, null, null, obeyTimescale);
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}
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/// <summary>
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/// Stops the blinking tween if running.
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/// </summary>
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public void StopBlinking()
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{
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if (_activeTween != null)
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{
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try
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{
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_activeTween.Cancel();
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}
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catch
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{
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// Some versions of the tween API may not expose Cancel; ignore safely.
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}
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_activeTween = null;
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}
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}
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}
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}
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