63 lines
2.0 KiB
C#
63 lines
2.0 KiB
C#
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.UIElements;
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namespace BITKit.UX
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{
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public class UXDrag : UXElement<VisualElement>
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{
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Vector3 m_IconStartPosition;
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Vector3 m_PointerStartPosition;
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bool isDraging;
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public override void OnStart()
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{
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base.OnStart();
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// listen for LMB down
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visualElement.RegisterCallback<PointerDownEvent>(PointerDownEventHandler);
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// listen for mouse movement and LMB up
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visualElement.RegisterCallback<PointerMoveEvent>(PointerMoveEventHandler);
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visualElement.RegisterCallback<PointerUpEvent>(PointerUpEventHandler);
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}
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protected virtual void PointerMoveEventHandler(PointerMoveEvent evt)
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{
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if (isDraging && visualElement.HasPointerCapture(evt.pointerId))
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{
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float newX = m_IconStartPosition.x + (evt.position.x - m_PointerStartPosition.x);
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float newY = m_IconStartPosition.y + (evt.position.y - m_PointerStartPosition.y);
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var delta = new Vector2(newX, newY);
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delta = GetProcessDelta(delta);
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visualElement.transform.position = delta;
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OnDelta(delta);
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}
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}
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protected virtual void PointerDownEventHandler(PointerDownEvent evt)
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{
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// set the icon and pointer starting positions
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m_IconStartPosition = visualElement.transform.position;
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m_PointerStartPosition = evt.position;
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visualElement.CapturePointer(evt.pointerId);
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isDraging = true;
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}
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protected virtual void PointerUpEventHandler(PointerUpEvent evt)
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{
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isDraging = false;
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visualElement.ReleasePointer(evt.pointerId);
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}
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protected virtual Vector2 GetProcessDelta(Vector2 delta)
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{
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return delta;
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}
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protected virtual void OnDelta(Vector2 delta)
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{
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}
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}
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}
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