116 lines
3.0 KiB
C#
116 lines
3.0 KiB
C#
using UnityEngine;
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using UnityEngine.EventSystems;
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using Direction = ImageCropper.Direction;
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namespace ImageCropperNamespace
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{
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public class SelectionMovementHandler : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler, ISelectionHandler
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{
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private const float SCROLL_DISTANCE = 5f;
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[SerializeField]
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private ImageCropper manager;
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private RectTransform selection;
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private Vector2 initialPosition;
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private Vector2 initialTouchPosition;
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private int draggingPointer;
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private void Awake()
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{
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selection = manager.Selection;
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}
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private void OnDisable()
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{
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manager.StopModifySelectionWith( this );
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}
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public void OnBeginDrag( PointerEventData eventData )
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{
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if( !manager.CanModifySelectionWith( this ) )
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{
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eventData.pointerDrag = null;
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return;
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}
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draggingPointer = eventData.pointerId;
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initialPosition = selection.anchoredPosition;
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initialTouchPosition = manager.GetTouchPosition( eventData.pressPosition, eventData.pressEventCamera );
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}
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public void OnDrag( PointerEventData eventData )
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{
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if( eventData.pointerId != draggingPointer )
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{
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eventData.pointerDrag = null;
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return;
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}
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manager.UpdateSelection( initialPosition + manager.GetTouchPosition( eventData.position, eventData.pressEventCamera ) - initialTouchPosition );
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}
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public void OnEndDrag( PointerEventData eventData )
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{
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if( eventData.pointerId == draggingPointer )
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manager.StopModifySelectionWith( this );
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}
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public void OnUpdate()
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{
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bool shouldUpdateViewport = false;
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float scale = manager.ImageHolder.localScale.z;
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Vector2 imagePosition = manager.ImageHolder.anchoredPosition;
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Vector2 selectionBottomLeft = imagePosition + selection.anchoredPosition * scale;
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Vector2 selectionTopRight = selectionBottomLeft + selection.sizeDelta * scale;
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Vector2 selectionSize = selectionTopRight - selectionBottomLeft;
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Vector2 viewportSize = manager.ViewportSize;
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if( selectionBottomLeft.x <= SCROLL_DISTANCE )
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{
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imagePosition = manager.ScrollImage( imagePosition, Direction.Left );
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selectionBottomLeft.x = 0f;
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shouldUpdateViewport = true;
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}
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else if( selectionTopRight.x >= viewportSize.x - SCROLL_DISTANCE )
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{
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imagePosition = manager.ScrollImage( imagePosition, Direction.Right );
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selectionBottomLeft.x = viewportSize.x - selectionSize.x;
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shouldUpdateViewport = true;
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}
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if( selectionBottomLeft.y <= SCROLL_DISTANCE )
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{
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imagePosition = manager.ScrollImage( imagePosition, Direction.Bottom );
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selectionBottomLeft.y = 0f;
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shouldUpdateViewport = true;
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}
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else if( selectionTopRight.y >= viewportSize.y - SCROLL_DISTANCE )
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{
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imagePosition = manager.ScrollImage( imagePosition, Direction.Top );
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selectionBottomLeft.y = viewportSize.y - selectionSize.y;
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shouldUpdateViewport = true;
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}
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if( shouldUpdateViewport )
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{
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manager.ImageHolder.anchoredPosition = imagePosition;
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manager.UpdateSelection( ( selectionBottomLeft - imagePosition ) / scale );
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}
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}
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public void Stop()
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{
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draggingPointer--;
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}
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}
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} |