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Assets/CoolapeFrame/3rd/NGUI_Enhance/Scripts/Interaction/UIImageButton.cs

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+//----------------------------------------------
+//            NGUI: Next-Gen UI kit
+// Copyright © 2011-2015 Tasharen Entertainment
+//----------------------------------------------
+
+using UnityEngine;
+
+/// <summary>
+/// Sample script showing how easy it is to implement a standard button that swaps sprites.
+/// </summary>
+
+[AddComponentMenu("NGUI/UI/Image Button")]
+public class UIImageButton : MonoBehaviour
+{
+	public UISprite target;
+	public string normalSprite;
+	public string hoverSprite;
+	public string pressedSprite;
+	public string disabledSprite;
+	public bool pixelSnap = true;
+
+	public bool isEnabled
+	{
+		get
+		{
+#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6
+			Collider col = collider;
+#else
+			Collider col = gameObject.GetComponent<Collider>();
+#endif
+			return col && col.enabled;
+		}
+		set
+		{
+#if UNITY_4_3 || UNITY_4_5 || UNITY_4_6
+			Collider col = collider;
+#else
+			Collider col = gameObject.GetComponent<Collider>();
+#endif
+			if (!col) return;
+
+			if (col.enabled != value)
+			{
+				col.enabled = value;
+				UpdateImage();
+			}
+		}
+	}
+
+	void OnEnable ()
+	{
+		if (target == null) target = GetComponentInChildren<UISprite>();
+		UpdateImage();
+	}
+
+	void OnValidate ()
+	{
+		if (target != null)
+		{
+			if (string.IsNullOrEmpty(normalSprite)) normalSprite = target.spriteName;
+			if (string.IsNullOrEmpty(hoverSprite)) hoverSprite = target.spriteName;
+			if (string.IsNullOrEmpty(pressedSprite)) pressedSprite = target.spriteName;
+			if (string.IsNullOrEmpty(disabledSprite)) disabledSprite = target.spriteName;
+		}
+	}
+
+	void UpdateImage()
+	{
+		if (target != null)
+		{
+			if (isEnabled) SetSprite(UICamera.IsHighlighted(gameObject) ? hoverSprite : normalSprite);
+			else SetSprite(disabledSprite);
+		}
+	}
+
+	void OnHover (bool isOver)
+	{
+		if (isEnabled && target != null)
+			SetSprite(isOver ? hoverSprite : normalSprite);
+	}
+
+	void OnPress (bool pressed)
+	{
+		if (pressed) SetSprite(pressedSprite);
+		else UpdateImage();
+	}
+
+	void SetSprite (string sprite)
+	{
+		if (target.atlas == null || target.atlas.GetSprite(sprite) == null) return;
+		target.spriteName = sprite;
+		if (pixelSnap) target.MakePixelPerfect();
+	}
+}