每日自动提交 2026-04-13 18:30
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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 SelectionResizeHandler : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler, ISelectionHandler
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{
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private const float SCROLL_DISTANCE = 70f;
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private const float SELECTION_MAX_DISTANCE_FOR_SCROLL = 50f;
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[SerializeField]
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private ImageCropper manager;
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[SerializeField]
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private Direction direction;
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[SerializeField]
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private Direction secondaryDirection = Direction.None;
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private Direction directions;
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private Direction pivot;
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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 Vector2 initialSelectionPosition;
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private Vector2 initialSelectionSize;
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private int draggingPointer;
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private PointerEventData draggingPointerEventData;
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private void Awake()
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{
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selection = manager.Selection;
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if( direction == Direction.None )
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{
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Direction temp = direction;
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direction = secondaryDirection;
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secondaryDirection = temp;
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}
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directions = direction | secondaryDirection;
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pivot = Direction.None;
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if( ( directions & Direction.Left ) == Direction.Left )
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pivot |= Direction.Right;
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else if( ( directions & Direction.Right ) == Direction.Right )
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pivot |= Direction.Left;
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if( ( directions & Direction.Top ) == Direction.Top )
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pivot |= Direction.Bottom;
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else if( ( directions & Direction.Bottom ) == Direction.Bottom )
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pivot |= Direction.Top;
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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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draggingPointerEventData = eventData;
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if( ( directions & Direction.Left ) == Direction.Left )
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initialPosition.x = selection.anchoredPosition.x;
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else if( ( directions & Direction.Right ) == Direction.Right )
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initialPosition.x = selection.anchoredPosition.x + selection.sizeDelta.x;
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if( ( directions & Direction.Top ) == Direction.Top )
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initialPosition.y = selection.anchoredPosition.y + selection.sizeDelta.y;
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else if( ( directions & Direction.Bottom ) == Direction.Bottom )
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initialPosition.y = selection.anchoredPosition.y;
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initialTouchPosition = manager.GetTouchPosition( eventData.pressPosition, eventData.pressEventCamera );
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initialSelectionPosition = selection.anchoredPosition;
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initialSelectionSize = selection.sizeDelta;
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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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draggingPointerEventData = eventData;
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Vector2 newPosition = initialPosition + manager.GetTouchPosition( eventData.position, eventData.pressEventCamera ) - initialTouchPosition;
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Vector2 selectionPosition = initialSelectionPosition;
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Vector2 selectionSize = initialSelectionSize;
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if( ( directions & Direction.Left ) == Direction.Left )
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{
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if( newPosition.x < manager.SelectionSnapToEdgeThreshold )
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newPosition.x = 0f;
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selectionSize.x -= newPosition.x - selectionPosition.x;
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selectionPosition.x = newPosition.x;
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}
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else if( ( directions & Direction.Right ) == Direction.Right )
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{
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if( newPosition.x > manager.OrientedImageSize.x - manager.SelectionSnapToEdgeThreshold )
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newPosition.x = manager.OrientedImageSize.x;
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selectionSize.x = newPosition.x - selectionPosition.x;
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}
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if( ( directions & Direction.Top ) == Direction.Top )
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{
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if( newPosition.y > manager.OrientedImageSize.y - manager.SelectionSnapToEdgeThreshold )
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newPosition.y = manager.OrientedImageSize.y;
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selectionSize.y = newPosition.y - selectionPosition.y;
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}
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else if( ( directions & Direction.Bottom ) == Direction.Bottom )
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{
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if( newPosition.y < manager.SelectionSnapToEdgeThreshold )
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newPosition.y = 0f;
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selectionSize.y -= newPosition.y - selectionPosition.y;
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selectionPosition.y = newPosition.y;
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}
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bool shouldExpand = false;
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if( secondaryDirection == Direction.None )
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{
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if( direction == Direction.Left || direction == Direction.Right )
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{
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if( selectionSize.x > initialSelectionSize.x )
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shouldExpand = true;
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}
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else
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{
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if( selectionSize.y > initialSelectionSize.y )
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shouldExpand = true;
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}
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}
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manager.UpdateSelection( selectionPosition, selectionSize, pivot, !shouldExpand );
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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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{
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draggingPointerEventData = null;
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manager.StopModifySelectionWith( this );
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}
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}
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public void OnUpdate()
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{
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if( draggingPointerEventData == null )
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return;
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Vector2 pointerLocalPos;
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RectTransformUtility.ScreenPointToLocalPointInRectangle( manager.Viewport, draggingPointerEventData.position, draggingPointerEventData.pressEventCamera, out pointerLocalPos );
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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 viewportSize = manager.ViewportSize;
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if( ( directions & Direction.Left ) == Direction.Left || ( directions & Direction.Right ) == Direction.Right )
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{
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if( pointerLocalPos.x <= SCROLL_DISTANCE && selectionBottomLeft.x <= SELECTION_MAX_DISTANCE_FOR_SCROLL )
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{
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imagePosition = manager.ScrollImage( imagePosition, Direction.Left );
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shouldUpdateViewport = true;
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}
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else if( pointerLocalPos.x >= viewportSize.x - SCROLL_DISTANCE && selectionTopRight.x >= viewportSize.x - SELECTION_MAX_DISTANCE_FOR_SCROLL )
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{
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imagePosition = manager.ScrollImage( imagePosition, Direction.Right );
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shouldUpdateViewport = true;
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}
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}
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if( ( directions & Direction.Bottom ) == Direction.Bottom || ( directions & Direction.Top ) == Direction.Top )
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{
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if( pointerLocalPos.y <= SCROLL_DISTANCE && selectionBottomLeft.y <= SELECTION_MAX_DISTANCE_FOR_SCROLL )
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{
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imagePosition = manager.ScrollImage( imagePosition, Direction.Bottom );
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shouldUpdateViewport = true;
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}
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else if( pointerLocalPos.y >= viewportSize.y - SCROLL_DISTANCE && selectionTopRight.y >= viewportSize.y - SELECTION_MAX_DISTANCE_FOR_SCROLL )
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{
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imagePosition = manager.ScrollImage( imagePosition, Direction.Top );
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shouldUpdateViewport = true;
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}
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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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OnDrag( draggingPointerEventData );
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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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draggingPointerEventData = null;
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}
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}
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}
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