114 lines
4.6 KiB
C#
114 lines
4.6 KiB
C#
/// Credit GXMark, alexzzzz, CaoMengde777, TroyDavis
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/// Original Sourced from (GXMark) - http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/page-2#post-1834806 (with corrections)
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/// Scaling fixed for non overlay canvases (alexzzzz) - http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/#post-1780612
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/// Canvas border fix (CaoMengde777) - http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/#post-1781658
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/// Canvas reset position fix (TroyDavis)- http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/#post-1782214
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using System;
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using UnityEngine.EventSystems;
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namespace UnityEngine.UI.Extensions
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{
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/// <summary>
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/// Includes a few fixes of my own, mainly to tidy up duplicates, remove unneeded stuff and testing. (nothing major, all the crew above did the hard work!)
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/// </summary>
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[RequireComponent(typeof(RectTransform))]
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[AddComponentMenu("UI/Extensions/UI Window Base")]
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public class UIWindowBase : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
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{
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RectTransform m_transform = null;
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private bool _isDragging = false;
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public static bool ResetCoords = false;
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private Vector3 m_originalCoods = Vector3.zero;
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private Canvas m_canvas;
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private RectTransform m_canvasRectTransform;
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public int KeepWindowInCanvas = 5; // # of pixels of the window that must stay inside the canvas view.
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// Use this for initialization
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void Start()
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{
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m_transform = GetComponent<RectTransform>();
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m_originalCoods = m_transform.position;
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m_canvas = GetComponentInParent<Canvas>();
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m_canvasRectTransform = m_canvas.GetComponent<RectTransform>();
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}
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void Update()
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{
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if (ResetCoords)
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resetCoordinatePosition();
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}
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public void OnDrag(PointerEventData eventData)
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{
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if (_isDragging)
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{
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var delta = ScreenToCanvas(eventData.position) - ScreenToCanvas(eventData.position - eventData.delta);
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m_transform.localPosition += delta;
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}
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}
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//Note, the begin drag and end drag aren't actually needed to control the drag. However, I'd recommend keeping it in case you want to do somethind else when draggging starts and stops
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public void OnBeginDrag(PointerEventData eventData)
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{
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if (eventData.pointerCurrentRaycast.gameObject == null)
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return;
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if (eventData.pointerCurrentRaycast.gameObject.name == name)
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{
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_isDragging = true;
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}
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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_isDragging = false;
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}
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void resetCoordinatePosition()
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{
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m_transform.position = m_originalCoods;
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ResetCoords = false;
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}
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private Vector3 ScreenToCanvas(Vector3 screenPosition)
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{
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Vector3 localPosition;
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Vector2 min;
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Vector2 max;
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var canvasSize = m_canvasRectTransform.sizeDelta;
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if (m_canvas.renderMode == RenderMode.ScreenSpaceOverlay || (m_canvas.renderMode == RenderMode.ScreenSpaceCamera && m_canvas.worldCamera == null))
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{
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localPosition = screenPosition;
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min = Vector2.zero;
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max = canvasSize;
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}
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else
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{
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var ray = m_canvas.worldCamera.ScreenPointToRay(screenPosition);
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var plane = new Plane(m_canvasRectTransform.forward, m_canvasRectTransform.position);
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float distance;
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if (plane.Raycast(ray, out distance) == false)
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{
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throw new Exception("Is it practically possible?");
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};
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var worldPosition = ray.origin + ray.direction * distance;
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localPosition = m_canvasRectTransform.InverseTransformPoint(worldPosition);
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min = -Vector2.Scale(canvasSize, m_canvasRectTransform.pivot);
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max = Vector2.Scale(canvasSize, Vector2.one - m_canvasRectTransform.pivot);
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}
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// keep window inside canvas
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localPosition.x = Mathf.Clamp(localPosition.x, min.x + KeepWindowInCanvas, max.x - KeepWindowInCanvas);
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localPosition.y = Mathf.Clamp(localPosition.y, min.y + KeepWindowInCanvas, max.y - KeepWindowInCanvas);
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return localPosition;
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}
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}
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} |