Support dragging and dropping attachments in the compose view controller
Allos dragging in attachments from other apps and drag/dropping with the compose VC to reorder attachments
This commit is contained in:
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7117ce6320
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1ccb450477
GPG Key ID:
94A5AB95422746E5
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@ -2,6 +2,17 @@
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>UTExportedTypeDeclarations</key>
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<array>
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<dict>
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<key>UTTypeConformsTo</key>
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<array/>
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<key>UTTypeIdentifier</key>
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<string>space.vaccor.Tusker.composition-attachment</string>
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<key>UTTypeTagSpecification</key>
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<dict/>
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</dict>
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</array>
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<key>CFBundleDevelopmentRegion</key>
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<string>$(DEVELOPMENT_LANGUAGE)</string>
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<key>CFBundleExecutable</key>
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@ -49,7 +60,7 @@
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<key>NSMicrophoneUsageDescription</key>
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<string>Post videos from the camera.</string>
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<key>NSPhotoLibraryAddUsageDescription</key>
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<string>Save photos directly from other people's posts.</string>
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<string>Save photos directly from other people's posts.</string>
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<key>NSPhotoLibraryUsageDescription</key>
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<string>Post photos from the photo library.</string>
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<key>NSUserActivityTypes</key>
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@ -23,6 +23,7 @@ class ComposeAttachmentTableViewCell: UITableViewCell {
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@IBOutlet weak var assetImageView: UIImageView!
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@IBOutlet weak var descriptionTextView: UITextView!
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@IBOutlet weak var descriptionPlaceholderLabel: UILabel!
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@IBOutlet weak var removeButton: UIButton!
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var attachment: CompositionAttachment!
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@ -38,7 +39,7 @@ class ComposeAttachmentTableViewCell: UITableViewCell {
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func updateUI(for attachment: CompositionAttachment) {
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self.attachment = attachment
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descriptionTextView.text = attachment.description
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descriptionTextView.text = attachment.attachmentDescription
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updateDescriptionPlaceholderLabel()
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switch attachment.data {
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@ -63,6 +64,16 @@ class ComposeAttachmentTableViewCell: UITableViewCell {
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descriptionPlaceholderLabel.isHidden = !descriptionTextView.text.isEmpty
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}
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func setEnabled(_ enabled: Bool) {
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descriptionTextView.isEditable = enabled
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removeButton.isEnabled = enabled
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}
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override func prepareForReuse() {
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super.prepareForReuse()
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assetImageView.image = nil
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}
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@IBAction func removeButtonPressed(_ sender: Any) {
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delegate?.removeAttachment(self)
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}
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@ -72,7 +83,7 @@ class ComposeAttachmentTableViewCell: UITableViewCell {
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extension ComposeAttachmentTableViewCell: UITextViewDelegate {
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func textViewDidChange(_ textView: UITextView) {
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delegate?.attachmentDescriptionChanged(self)
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attachment.description = textView.text
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attachment.attachmentDescription = textView.text
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updateDescriptionPlaceholderLabel()
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}
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}
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@ -27,6 +27,7 @@
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<subviews>
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<imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="GLY-o8-47z">
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<rect key="frame" x="0.0" y="0.0" width="80" height="80"/>
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<color key="backgroundColor" systemColor="secondarySystemBackgroundColor" red="0.94901960780000005" green="0.94901960780000005" blue="0.96862745100000003" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
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<constraints>
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<constraint firstAttribute="width" constant="80" id="X6q-g9-dPN"/>
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<constraint firstAttribute="height" constant="80" id="xgQ-E3-0QI"/>
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@ -72,6 +73,7 @@
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<outlet property="assetImageView" destination="GLY-o8-47z" id="hZH-ur-m4z"/>
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<outlet property="descriptionPlaceholderLabel" destination="h6T-x4-yzl" id="jBe-R0-Sfn"/>
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<outlet property="descriptionTextView" destination="cwP-Eh-5dJ" id="pxJ-zF-GKC"/>
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<outlet property="removeButton" destination="Lvf-I9-aV3" id="3qk-Zr-je1"/>
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</connections>
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<point key="canvasLocation" x="107" y="181"/>
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</tableViewCell>
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@ -8,6 +8,7 @@
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import UIKit
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import Pachyderm
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import MobileCoreServices
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protocol ComposeAttachmentsViewControllerDelegate: class {
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func composeSelectedAttachmentsDidChange()
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@ -55,10 +56,20 @@ class ComposeAttachmentsViewController: UITableViewController {
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tableView.register(UINib(nibName: "AddAttachmentTableViewCell", bundle: .main), forCellReuseIdentifier: "addAttachment")
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tableView.register(UINib(nibName: "ComposeAttachmentTableViewCell", bundle: .main), forCellReuseIdentifier: "composeAttachment")
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heightConstraint = tableView.heightAnchor.constraint(equalToConstant: tableView.contentSize.height)
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// you would think the table view could handle this itself, but no, using a constraint on the table view's contentLayoutGuide doesn't work
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// add extra space, so when dropping items, the add attachment cell doesn't disappear
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heightConstraint = tableView.heightAnchor.constraint(equalToConstant: tableView.contentSize.height + 80)
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heightConstraint.isActive = true
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pasteConfiguration = UIPasteConfiguration(forAccepting: UIImage.self)
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// prevents extra separator lines from appearing when the height of the table view is greater than the height of the content
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tableView.tableFooterView = UIView()
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pasteConfiguration = UIPasteConfiguration(forAccepting: CompositionAttachment.self)
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// enable dragging on iPhone to allow reordering
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tableView.dragInteractionEnabled = true
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tableView.dragDelegate = self
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tableView.dropDelegate = self
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}
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override func viewWillAppear(_ animated: Bool) {
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@ -77,7 +88,8 @@ class ComposeAttachmentsViewController: UITableViewController {
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}
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private func updateHeightConstraint() {
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heightConstraint.constant = tableView.contentSize.height
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// add extra space, so when dropping items, the add attachment cell doesn't disappear
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heightConstraint.constant = tableView.contentSize.height + 80
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}
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private func isAddAttachmentsButtonEnabled() -> Bool {
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@ -90,7 +102,7 @@ class ComposeAttachmentsViewController: UITableViewController {
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}
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private func updateAddAttachmentsButtonEnabled() {
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let cell = tableView.cellForRow(at: IndexPath(row: 0, section: 1)) as! AddAttachmentTableViewCell
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guard let cell = tableView.cellForRow(at: IndexPath(row: 0, section: 1)) as? AddAttachmentTableViewCell else { return }
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cell.setEnabled(isAddAttachmentsButtonEnabled())
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}
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@ -105,16 +117,15 @@ class ComposeAttachmentsViewController: UITableViewController {
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override func paste(itemProviders: [NSItemProvider]) {
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for provider in itemProviders {
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provider.loadObject(ofClass: UIImage.self) { (object, error) in
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provider.loadObject(ofClass: CompositionAttachment.self) { (object, error) in
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if let error = error {
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fatalError("Couldn't load image from NSItemProvider: \(error)")
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}
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guard let image = object as? UIImage else {
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fatalError("Couldn't convert object from NSItemProvider to UIImage")
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guard let attachment = object as? CompositionAttachment else {
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fatalError("Couldn't convert object from NSItemProvider to CompositionAttachment")
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}
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DispatchQueue.main.async {
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let attachment = CompositionAttachment(data: .image(image))
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self.attachments.append(attachment)
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self.tableView.insertRows(at: [IndexPath(row: self.attachments.count - 1, section: 0)], with: .automatic)
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self.updateHeightConstraint()
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@ -219,6 +230,7 @@ class ComposeAttachmentsViewController: UITableViewController {
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let cell = tableView.dequeueReusableCell(withIdentifier: "composeAttachment", for: indexPath) as! ComposeAttachmentTableViewCell
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cell.delegate = self
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cell.updateUI(for: attachment)
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cell.setEnabled(true)
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return cell
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case 1:
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let cell = tableView.dequeueReusableCell(withIdentifier: "addAttachment", for: indexPath) as! AddAttachmentTableViewCell
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@ -229,6 +241,12 @@ class ComposeAttachmentsViewController: UITableViewController {
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}
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}
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override func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
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guard sourceIndexPath != destinationIndexPath, sourceIndexPath.section == 0, destinationIndexPath.section == 0 else { return }
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attachments.insert(attachments.remove(at: sourceIndexPath.row), at: destinationIndexPath.row)
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}
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// MARK: Table view delegate
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override func tableView(_ tableView: UITableView, willSelectRowAt indexPath: IndexPath) -> IndexPath? {
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@ -254,6 +272,88 @@ class ComposeAttachmentsViewController: UITableViewController {
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}
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extension ComposeAttachmentsViewController: UITableViewDragDelegate {
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func tableView(_ tableView: UITableView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
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let attachment = attachments[indexPath.row]
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let provider = NSItemProvider(object: attachment)
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let dragItem = UIDragItem(itemProvider: provider)
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dragItem.localObject = attachment
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return [dragItem]
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}
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func tableView(_ tableView: UITableView, itemsForAddingTo session: UIDragSession, at indexPath: IndexPath, point: CGPoint) -> [UIDragItem] {
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let attachment = attachments[indexPath.row]
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let provider = NSItemProvider(object: attachment)
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let dragItem = UIDragItem(itemProvider: provider)
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dragItem.localObject = attachment
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return [dragItem]
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}
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func tableView(_ tableView: UITableView, dragPreviewParametersForRowAt indexPath: IndexPath) -> UIDragPreviewParameters? {
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let cell = tableView.cellForRow(at: indexPath) as! ComposeAttachmentTableViewCell
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let rect = cell.convert(cell.assetImageView.bounds, from: cell.assetImageView)
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let path = UIBezierPath(roundedRect: rect, cornerRadius: cell.assetImageView.layer.cornerRadius)
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let params = UIDragPreviewParameters()
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params.visiblePath = path
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return params
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}
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}
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extension ComposeAttachmentsViewController: UITableViewDropDelegate {
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func tableView(_ tableView: UITableView, canHandle session: UIDropSession) -> Bool {
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return session.canLoadObjects(ofClass: CompositionAttachment.self)
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}
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func tableView(_ tableView: UITableView, dropSessionDidUpdate session: UIDropSession, withDestinationIndexPath destinationIndexPath: IndexPath?) -> UITableViewDropProposal {
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// if items were dragged out of ourself, then the items are only being moved
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if tableView.hasActiveDrag {
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// todo: should moving multiple items actually be prohibited?
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if session.items.count > 1 {
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return UITableViewDropProposal(operation: .cancel)
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} else {
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return UITableViewDropProposal(operation: .move, intent: .insertAtDestinationIndexPath)
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}
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} else {
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return UITableViewDropProposal(operation: .copy, intent: .insertAtDestinationIndexPath)
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}
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}
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func tableView(_ tableView: UITableView, performDropWith coordinator: UITableViewDropCoordinator) {
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let destinationIndexPath = coordinator.destinationIndexPath ?? IndexPath(row: attachments.count, section: 0)
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// we don't need to handle local items here, when the .move operation is used returned from the tableView(_:dropSessionDidUpdate:withDestinationIndexPath:) method,
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// the table view will handle animating and call the normal data source tableView(_:moveRowAt:to:)
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for (index, item) in coordinator.items.enumerated() {
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let provider = item.dragItem.itemProvider
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if provider.canLoadObject(ofClass: CompositionAttachment.self) {
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let indexPath = IndexPath(row: destinationIndexPath.row + index, section: 0)
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let placeholder = UITableViewDropPlaceholder(insertionIndexPath: indexPath, reuseIdentifier: "composeAttachment", rowHeight: 96)
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placeholder.cellUpdateHandler = { (cell) in
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let cell = cell as! ComposeAttachmentTableViewCell
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cell.setEnabled(false)
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}
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let placeholderContext = coordinator.drop(item.dragItem, to: placeholder)
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provider.loadObject(ofClass: CompositionAttachment.self) { (object, error) in
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DispatchQueue.main.async {
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if let attachment = object as? CompositionAttachment {
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placeholderContext.commitInsertion { (insertionIndexPath) in
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self.attachments.insert(attachment, at: insertionIndexPath.row)
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}
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} else {
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placeholderContext.deletePlaceholder()
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}
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}
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}
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}
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}
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updateHeightConstraint()
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}
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}
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extension ComposeAttachmentsViewController: AssetPickerViewControllerDelegate {
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func assetPicker(_ assetPicker: AssetPickerViewController, shouldAllowAssetOfType type: CompositionAttachmentData.AttachmentType) -> Bool {
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switch mastodonController.instance.instanceType {
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@ -7,19 +7,72 @@
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//
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import Foundation
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import UIKit
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import MobileCoreServices
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final class CompositionAttachment: NSObject, Codable {
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static let typeIdentifier = "space.vaccor.Tusker.composition-attachment"
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class CompositionAttachment: Codable {
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let data: CompositionAttachmentData
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var description: String
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var attachmentDescription: String
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init(data: CompositionAttachmentData, description: String = "") {
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self.data = data
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self.description = description
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self.attachmentDescription = description
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}
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}
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extension CompositionAttachment: Equatable {
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static func ==(lhs: CompositionAttachment, rhs: CompositionAttachment) -> Bool {
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return lhs.data == rhs.data
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}
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}
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private let imageType = kUTTypeImage as String
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private let dataType = kUTTypeData as String
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extension CompositionAttachment: NSItemProviderWriting {
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static var writableTypeIdentifiersForItemProvider: [String] {
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[typeIdentifier]
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}
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func loadData(withTypeIdentifier typeIdentifier: String, forItemProviderCompletionHandler completionHandler: @escaping (Data?, Error?) -> Void) -> Progress? {
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if typeIdentifier == CompositionAttachment.typeIdentifier {
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do {
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completionHandler(try PropertyListEncoder().encode(self), nil)
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} catch {
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completionHandler(nil, error)
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}
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}
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completionHandler(nil, ItemProviderError.incompatibleTypeIdentifier)
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return nil
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}
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enum ItemProviderError: Error {
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case incompatibleTypeIdentifier
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var localizedDescription: String {
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switch self {
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case .incompatibleTypeIdentifier:
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return "Cannot provide data for given type"
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}
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}
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}
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}
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extension CompositionAttachment: NSItemProviderReading {
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static var readableTypeIdentifiersForItemProvider: [String] {
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[typeIdentifier] + UIImage.readableTypeIdentifiersForItemProvider + NSURL.readableTypeIdentifiersForItemProvider
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}
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static func object(withItemProviderData data: Data, typeIdentifier: String) throws -> Self {
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if typeIdentifier == CompositionAttachment.typeIdentifier {
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return try PropertyListDecoder().decode(Self.self, from: data)
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} else if UIImage.readableTypeIdentifiersForItemProvider.contains(typeIdentifier), let image = try? UIImage.object(withItemProviderData: data, typeIdentifier: typeIdentifier) {
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return CompositionAttachment(data: .image(image)) as! Self
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} else if NSURL.readableTypeIdentifiersForItemProvider.contains(typeIdentifier), let url = try? NSURL.object(withItemProviderData: data, typeIdentifier: typeIdentifier) as URL {
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return CompositionAttachment(data: .video(url)) as! Self
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} else {
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throw ItemProviderError.incompatibleTypeIdentifier
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}
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}
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}
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