//

// ImagePickerCollectionView.swift

// ImagePickerSheet

//

// Created by Laurin Brandner on 07/09/14.

// Copyright (c) 2014 Laurin Brandner. All rights reserved.

//

import UIKit

class ImagePickerCollectionView: UICollectionView {

var bouncing: Bool {

return contentOffset.x < -contentInset.left || contentOffset.x + frame.width > contentSize.width + contentInset.right

}

var imagePreviewLayout: ImagePreviewFlowLayout {

return collectionViewLayout as! ImagePreviewFlowLayout

}

// MARK: - Initialization

init() {

super.init(frame: CGRectZero, collectionViewLayout: ImagePreviewFlowLayout())

initialize()

}

required init?(coder aDecoder: NSCoder) {

super.init(coder: aDecoder)

initialize()

}

private func initialize() {

panGestureRecognizer.addTarget(self, action: "handlePanGesture:")

}

// MARK: - Panning

@objc private func handlePanGesture(gestureRecognizer: UIPanGestureRecognizer) {

if gestureRecognizer.state == .Ended {

let translation = gestureRecognizer.translationInView(self)

if translation == CGPointZero {

if !bouncing {

let possibleIndexPath = indexPathForItemAtPoint(gestureRecognizer.locationInView(self))

if let indexPath = possibleIndexPath {

selectItemAtIndexPath(indexPath, animated: false, scrollPosition: .None)

delegate?.collectionView?(self, didSelectItemAtIndexPath: indexPath)

}

}

}

}

}

}