//
// NCViewerImageZoom.swift
// Nextcloud
//
// Created by Marino Faggiana on 24/10/2020.
// Copyright © 2020 Marino Faggiana. All rights reserved.
//
// Author Marino Faggiana <marino.faggiana@nextcloud.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
import UIKit
import NCCommunication
protocol NCViewerImageZoomDelegate {
func didAppearImageZoom(viewerImageZoom: NCViewerImageZoom, metadata: tableMetadata)
func dismissImageZoom()
}
class NCViewerImageZoom: UIViewController {
@IBOutlet weak var detailViewConstraint: NSLayoutConstraint!
@IBOutlet weak var imageViewTopConstraint: NSLayoutConstraint!
@IBOutlet weak var imageViewBottomConstraint: NSLayoutConstraint!
@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var statusViewImage: UIImageView!
@IBOutlet weak var statusLabel: UILabel!
@IBOutlet weak var detailView: NCViewerImageDetailView!
@IBOutlet weak var videoToolBar: NCViewerVideoToolBar!
var delegate: NCViewerImageZoomDelegate?
var viewerImage: NCViewerImage?
var image: UIImage?
var metadata: tableMetadata = tableMetadata()
var index: Int = 0
var isShowDetail: Bool = false
var noPreview: Bool = false
var doubleTapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer()
var imageViewConstraint: CGFloat = 0
// MARK: - View Life Cycle
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
doubleTapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(didDoubleTapWith(gestureRecognizer:)))
doubleTapGestureRecognizer.numberOfTapsRequired = 2
}
override func viewDidLoad() {
super.viewDidLoad()
scrollView.delegate = self
scrollView.maximumZoomScale = 4
scrollView.minimumZoomScale = 1
view.addGestureRecognizer(doubleTapGestureRecognizer)
if image == nil {
var named = "noPreview"
if metadata.classFile == NCCommunicationCommon.typeClassFile.audio.rawValue { named = "noPreviewAudio" }
if metadata.classFile == NCCommunicationCommon.typeClassFile.video.rawValue { named = "noPreviewVideo" }
image = UIImage.init(named: named)!.image(color: .gray, size: view.frame.width)
self.noPreview = true
}
if let image = image {
imageView.image = image
imageView.frame = CGRect(x: imageView.frame.origin.x, y: imageView.frame.origin.y, width: image.size.width, height: image.size.height)
}
if NCManageDatabase.shared.getMetadataLivePhoto(metadata: metadata) != nil {
statusViewImage.image = NCUtility.shared.loadImage(named: "livephoto", color: .gray)
statusLabel.text = "LIVE"
} else {
statusViewImage.image = nil
statusLabel.text = ""
}
var heightMap = (view.bounds.height / 3)
if view.bounds.width < view.bounds.height {
heightMap = (view.bounds.width / 3)
}
detailViewConstraint.constant = 0
detailView.update(metadata: metadata, image: image, heightMap: heightMap)
detailView.hide()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if isShowDetail {
openDetail()
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
delegate?.didAppearImageZoom(viewerImageZoom: self, metadata: metadata)
}
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
coordinator.animate(alongsideTransition: { (context) in
// back to the original size
self.scrollView.zoom(to: CGRect(x: 0, y: 0, width: self.scrollView.bounds.width, height: self.scrollView.bounds.height), animated: false)
self.view.layoutIfNeeded()
UIView.animate(withDuration: context.transitionDuration) {
// resize frame video
NCViewerVideo.shared.videoLayer?.frame = self.imageView.layer.bounds
// resize detail
if self.detailView.isShow() {
self.openDetail()
}
}
}) { (_) in }
}
//MARK: - NotificationCenter
//MARK: - Gesture
@objc func didDoubleTapWith(gestureRecognizer: UITapGestureRecognizer) {
if detailView.isShow() { return }
// NO ZOOM for Audio / Video
if (metadata.classFile == NCCommunicationCommon.typeClassFile.video.rawValue || metadata.classFile == NCCommunicationCommon.typeClassFile.audio.rawValue) && !videoToolBar.isHidden {
return
}
let pointInView = gestureRecognizer.location(in: self.imageView)
var newZoomScale = self.scrollView.maximumZoomScale
if self.scrollView.zoomScale >= newZoomScale || abs(self.scrollView.zoomScale - newZoomScale) <= 0.01 {
newZoomScale = self.scrollView.minimumZoomScale
}
let width = self.scrollView.bounds.width / newZoomScale
let height = self.scrollView.bounds.height / newZoomScale
let originX = pointInView.x - (width / 2.0)
let originY = pointInView.y - (height / 2.0)
let rectToZoomTo = CGRect(x: originX, y: originY, width: width, height: height)
self.scrollView.zoom(to: rectToZoomTo, animated: true)
}
@objc func didPanWith(gestureRecognizer: UIPanGestureRecognizer) {
let currentLocation = gestureRecognizer.translation(in: self.view)
switch gestureRecognizer.state {
case .began:
print("began")
case .ended:
if detailView.isShow() {
self.imageViewTopConstraint.constant = -imageViewConstraint
self.imageViewBottomConstraint.constant = imageViewConstraint
} else {
self.imageViewTopConstraint.constant = 0
self.imageViewBottomConstraint.constant = 0
}
case .changed:
imageViewTopConstraint.constant = (currentLocation.y - imageViewConstraint)
imageViewBottomConstraint.constant = -(currentLocation.y - imageViewConstraint)
// DISMISS VIEW
if detailView.isHidden && (currentLocation.y > 20) {
delegate?.dismissImageZoom()
}
// CLOSE DETAIL
if !detailView.isHidden && (currentLocation.y > 20) {
self.closeDetail()
gestureRecognizer.state = .ended
}
// OPEN DETAIL
if detailView.isHidden && (currentLocation.y < -20) {
self.openDetail()
gestureRecognizer.state = .ended
}
default:
break
}
}
}
//MARK: -
extension NCViewerImageZoom {
private func openDetail() {
self.detailView.show(textColor: self.viewerImage?.textColor)
if let image = imageView.image {
let ratioW = imageView.frame.width / image.size.width
let ratioH = imageView.frame.height / image.size.height
let ratio = ratioW < ratioH ? ratioW : ratioH
let imageHeight = image.size.height * ratio
imageViewConstraint = self.detailView.frame.height - ((self.view.frame.height - imageHeight) / 2) + self.view.safeAreaInsets.bottom
if imageViewConstraint < 0 { imageViewConstraint = 0 }
}
UIView.animate(withDuration: 0.3) {
self.imageViewTopConstraint.constant = -self.imageViewConstraint
self.imageViewBottomConstraint.constant = self.imageViewConstraint
self.detailViewConstraint.constant = self.detailView.frame.height
self.view.layoutIfNeeded()
} completion: { (_) in
}
scrollView.pinchGestureRecognizer?.isEnabled = false
}
private func closeDetail() {
self.detailView.hide()
imageViewConstraint = 0
UIView.animate(withDuration: 0.3) {
self.imageViewTopConstraint.constant = 0
self.imageViewBottomConstraint.constant = 0
self.detailViewConstraint.constant = 0
self.view.layoutIfNeeded()
} completion: { (_) in
}
scrollView.pinchGestureRecognizer?.isEnabled = true
}
}
//MARK: -
extension NCViewerImageZoom: UIScrollViewDelegate {
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
return imageView
}
func scrollViewDidZoom(_ scrollView: UIScrollView) {
if scrollView.zoomScale > 1 {
if let image = imageView.image {
let ratioW = imageView.frame.width / image.size.width
let ratioH = imageView.frame.height / image.size.height
let ratio = ratioW < ratioH ? ratioW : ratioH
let newWidth = image.size.width * ratio
let newHeight = image.size.height * ratio
let conditionLeft = newWidth*scrollView.zoomScale > imageView.frame.width
let left = 0.5 * (conditionLeft ? newWidth - imageView.frame.width : (scrollView.frame.width - scrollView.contentSize.width))
let conditioTop = newHeight*scrollView.zoomScale > imageView.frame.height
let top = 0.5 * (conditioTop ? newHeight - imageView.frame.height : (scrollView.frame.height - scrollView.contentSize.height))
scrollView.contentInset = UIEdgeInsets(top: top, left: left, bottom: top, right: left)
}
} else {
scrollView.contentInset = .zero
}
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
}
}