using UnityEngine;
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using UnityEngine.UI;
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using UnityInput = UnityEngine.Input;
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namespace TowerDefense.UI
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{
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/// <summary>
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/// Component to override ScrollRect, uses normalized mouse position inside ScrollRect to scroll
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/// </summary>
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[RequireComponent(typeof(ScrollRect))]
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public class MouseScroll : MonoBehaviour
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{
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/// <summary>
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/// If the normalized scroll position should be clamped between 0 & 1
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/// </summary>
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public bool clampScroll = true;
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/// <summary>
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/// Buffer to adjust ScrollRect size
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/// </summary>
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public float scrollXBuffer;
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public float scrollYBuffer;
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protected ScrollRect m_ScrollRect;
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protected RectTransform m_ScrollRectTransform;
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protected bool m_OverrideScrolling,
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m_HasRightBuffer;
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public void SetHasRightBuffer(bool rightBuffer)
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{
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m_HasRightBuffer = rightBuffer;
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}
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/// <summary>
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/// If appropriate, we cache ScrollRect reference, disable it and enable scrolling override
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/// </summary>
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void Start()
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{
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#if UNITY_STANDALONE || UNITY_EDITOR
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m_ScrollRect = GetComponent<ScrollRect>();
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m_ScrollRect.enabled = false;
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m_OverrideScrolling = true;
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m_ScrollRectTransform = (RectTransform) m_ScrollRect.transform;
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#else
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m_OverrideScrolling = false;
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#endif
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}
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/// <summary>
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/// Use normalized mouse position inside ScrollRect to scroll
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/// </summary>
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void Update()
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{
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if (!m_OverrideScrolling)
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{
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return;
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}
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Vector3 mousePosition = UnityInput.mousePosition;
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// only scroll if mouse is inside ScrollRect
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bool inside = RectTransformUtility.RectangleContainsScreenPoint(m_ScrollRectTransform, mousePosition);
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if (!inside)
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{
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return;
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}
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Rect rect = m_ScrollRectTransform.rect;
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float adjustmentX = rect.width * scrollXBuffer,
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adjustmentY = rect.height * scrollYBuffer;
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Vector2 localPoint;
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RectTransformUtility.ScreenPointToLocalPointInRectangle(m_ScrollRectTransform, mousePosition, null, out localPoint);
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Vector2 pivot = m_ScrollRectTransform.pivot;
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float x = (localPoint.x + (rect.width - adjustmentX) * pivot.x) / (rect.width - 2 * adjustmentX);
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float y = (localPoint.y + (rect.height - adjustmentY) * pivot.y) / (rect.height - 2 * adjustmentY);
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if (clampScroll)
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{
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x = Mathf.Clamp01(x);
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y = Mathf.Clamp01(y);
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}
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m_ScrollRect.normalizedPosition = new Vector2(x, y);
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}
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/// <summary>
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/// Called when a button inside the scroll is selected
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/// </summary>
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/// <param name="levelSelectButton">Selected child</param>
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public void SelectChild(LevelSelectButton levelSelectButton)
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{
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// minus one if buffer
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int childCount = levelSelectButton.transform.parent.childCount - (m_HasRightBuffer ? 1 : 0);
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if (childCount > 1)
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{
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float normalized = (float)levelSelectButton.transform.GetSiblingIndex() / ( childCount - 1);
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m_ScrollRect.normalizedPosition = new Vector2(normalized, 0);
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}
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}
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}
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}
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