feat: support dragging the crop box when touch point outside the crop…

… box (#339)

* feat: support dragging the crop box when touch point outside the crop box
* refactor: rename updateTouchPointIfNeeded to confineTouchPoint

Sources/Mantis/CropView/CropView.swift

@@ -315,34 +315,45 @@ final class CropView: UIView {
         rotationControlView.handleDeviceRotation()
     }
 
-    func updateCropBoxFrame(withTouchPoint touchPoint: CGPoint) {
-        let contentBounds = getContentBounds()
+    private func confineTouchPoint(_ touchPoint: CGPoint, in rect: CGRect) -> CGPoint {
+        var confinedPoint = touchPoint
 
-        guard contentBounds.contains(touchPoint) else {
-            return
+        // Get the frame dimensions
+        let frameWidth = frame.size.width
+        let frameHeight = frame.size.height
+
+        // Check if the touch point is outside the frame
+        if touchPoint.x < frame.origin.x {
+            confinedPoint.x = frame.origin.x
+        } else if touchPoint.x > (frame.origin.x + frameWidth) {
+            confinedPoint.x = frame.origin.x + frameWidth
         }
 
-        let imageContainerRect = imageContainer.convert(imageContainer.bounds, to: self)        
+        if touchPoint.y < frame.origin.y {
+            confinedPoint.y = frame.origin.y
+        } else if touchPoint.y > (frame.origin.y + frameHeight) {
+            confinedPoint.y = frame.origin.y + frameHeight
+        }
+
+        return confinedPoint
+    }
+
+    func updateCropBoxFrame(withTouchPoint touchPoint: CGPoint) {
+        let imageContainerRect = imageContainer.convert(imageContainer.bounds, to: self)
         let imageFrame = CGRect(x: cropWorkbenchView.frame.origin.x - cropWorkbenchView.contentOffset.x,
                                 y: cropWorkbenchView.frame.origin.y - cropWorkbenchView.contentOffset.y,
                                 width: imageContainerRect.size.width,
                                 height: imageContainerRect.size.height)
 
-        guard imageFrame.contains(touchPoint) else {
-            return
-        }
-
+        let touchPoint = confineTouchPoint(touchPoint, in: imageFrame)
+        let contentBounds = getContentBounds()
         let cropViewMinimumBoxSize = cropViewConfig.minimumCropBoxSize
         let newCropBoxFrame = viewModel.getNewCropBoxFrame(withTouchPoint: touchPoint,
                                                            andContentFrame: contentBounds,
                                                            aspectRatioLockEnabled: aspectRatioLockEnabled)
 
         guard newCropBoxFrame.width >= cropViewMinimumBoxSize
-                && newCropBoxFrame.minX >= contentBounds.minX
-                && newCropBoxFrame.maxX <= contentBounds.maxX
-                && newCropBoxFrame.height >= cropViewMinimumBoxSize
-                && newCropBoxFrame.minY >= contentBounds.minY
-                && newCropBoxFrame.maxY <= contentBounds.maxY else {
+           && newCropBoxFrame.height >= cropViewMinimumBoxSize else {
             return
         }