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CropView+UIScrollViewDelegate.swift
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CropView+UIScrollViewDelegate.swift
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//
// CropView+UIScrollViewDelegate.swift
// Mantis
//
// Created by Echo on 5/24/19.
//
import Foundation
import UIKit
extension CropView: UIScrollViewDelegate {
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
return imageContainer
}
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
delegate?.cropViewDidBeginCrop(self)
viewModel.setTouchImageStatus()
}
func scrollViewWillBeginZooming(_ scrollView: UIScrollView, with view: UIView?) {
// A resize event has begun via gesture on the photo (scrollview), so notify delegate
delegate?.cropViewDidBeginResize(self)
viewModel.setTouchImageStatus()
}
func scrollViewDidZoom(_ scrollView: UIScrollView) {
guard scrollView.subviews.count > 0 else {
return
}
let subView = scrollView.subviews[0]
let offsetX: CGFloat = max((scrollView.bounds.size.width - scrollView.contentSize.width) * 0.5, 0.0)
let offsetY: CGFloat = max((scrollView.bounds.size.height - scrollView.contentSize.height) * 0.5, 0.0)
subView.center = CGPointMake(scrollView.contentSize.width * 0.5 + offsetX, scrollView.contentSize.height * 0.5 + offsetY)
}
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
viewModel.setBetweenOperationStatus()
}
func scrollViewDidEndZooming(_ scrollView: UIScrollView, with view: UIView?, atScale scale: CGFloat) {
delegate?.cropViewDidEndResize(self)
makeSureImageContainsCropOverlay()
isManuallyZoomed = true
viewModel.setBetweenOperationStatus()
}
func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
if !decelerate {
viewModel.setBetweenOperationStatus()
}
}
}