using UnityEngine;
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namespace TowerDefense.UI
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{
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/// <summary>
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/// A class for controlling conditional motion of the canvas
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/// </summary>
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[RequireComponent(typeof(Canvas))]
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public class MovingCanvas : MonoBehaviour
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{
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/// <summary>
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/// The RectTransform used to check against the screen bounds
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/// </summary>
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public RectTransform content;
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/// <summary>
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/// To offset the position the canvas is placed at
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/// </summary>
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public Vector2 offset;
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/// <summary>
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/// The attached canvas
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/// </summary>
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Canvas m_Canvas;
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/// <summary>
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/// Property for disabling and enabling the attached canvas
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/// </summary>
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public bool canvasEnabled
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{
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get
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{
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if (m_Canvas == null)
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{
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m_Canvas = GetComponent<Canvas>();
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}
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return m_Canvas.enabled;
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}
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set
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{
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if (m_Canvas == null)
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{
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m_Canvas = GetComponent<Canvas>();
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}
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m_Canvas.enabled = value;
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}
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}
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/// <summary>
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/// Try to move the canvas based on <see cref="content"/>'s rect
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/// </summary>
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/// <param name="position">
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/// The position to move to
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/// </param>
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public void TryMove(Vector3 position)
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{
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Rect rect = content.rect;
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position += (Vector3) offset;
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rect.position = position;
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if (rect.xMin < rect.width * 0.5f)
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{
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position.x = rect.width * 0.5f;
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}
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if (rect.xMax > Screen.width - rect.width * 0.5f)
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{
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position.x = Screen.width - rect.width * 0.5f;
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}
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if (rect.yMin < rect.height * 0.5f)
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{
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position.y = rect.height * 0.5f;
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}
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if (rect.yMax > Screen.height - rect.height * 0.5f)
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{
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position.y = Screen.height - rect.height * 0.5f;
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}
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transform.position = position;
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}
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/// <summary>
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/// Cache the attached canvas
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/// </summary>
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protected virtual void Awake()
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{
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canvasEnabled = false;
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}
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}
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}
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