implement preview file loading in document gallery without depending on messageKit components, rename FileTableViewCell to DocumentGalleryFileCell to avoid confusion between this cell and the chat view's file view

deltachat-ios.xcodeproj/project.pbxproj

@@ -110,7 +110,7 @@
 		AE851A04227AECDE00ED86F0 /* deltachat_iosTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = AE851A03227AECDE00ED86F0 /* deltachat_iosTests.swift */; };
 		AE851AC5227C755A00ED86F0 /* Protocols.swift in Sources */ = {isa = PBXBuildFile; fileRef = AE851AC4227C755A00ED86F0 /* Protocols.swift */; };
 		AE851AD0227DF50900ED86F0 /* GroupChatDetailViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = AE851ACF227DF50900ED86F0 /* GroupChatDetailViewController.swift */; };
-		AE8DD451249D1DFB009A4BC1 /* FileTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = AE8DD450249D1DFB009A4BC1 /* FileTableViewCell.swift */; };
+		AE8DD451249D1DFB009A4BC1 /* DocumentGalleryFileCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = AE8DD450249D1DFB009A4BC1 /* DocumentGalleryFileCell.swift */; };
 		AE8F503524753DFE007FEE0B /* GalleryViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = AE8F503424753DFE007FEE0B /* GalleryViewController.swift */; };
 		AE9DAF0D22C1215D004C9591 /* EditContactController.swift in Sources */ = {isa = PBXBuildFile; fileRef = AE9DAF0C22C1215D004C9591 /* EditContactController.swift */; };
 		AE9DAF0F22C278C6004C9591 /* ChatTitleView.swift in Sources */ = {isa = PBXBuildFile; fileRef = AE9DAF0E22C278C6004C9591 /* ChatTitleView.swift */; };
@@ -345,7 +345,7 @@
 		AE851A05227AECDF00ED86F0 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		AE851AC4227C755A00ED86F0 /* Protocols.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Protocols.swift; sourceTree = "<group>"; };
 		AE851ACF227DF50900ED86F0 /* GroupChatDetailViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GroupChatDetailViewController.swift; sourceTree = "<group>"; };
-		AE8DD450249D1DFB009A4BC1 /* FileTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FileTableViewCell.swift; sourceTree = "<group>"; };
+		AE8DD450249D1DFB009A4BC1 /* DocumentGalleryFileCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DocumentGalleryFileCell.swift; sourceTree = "<group>"; };
 		AE8F503424753DFE007FEE0B /* GalleryViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GalleryViewController.swift; sourceTree = "<group>"; };
 		AE9DAF0C22C1215D004C9591 /* EditContactController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EditContactController.swift; sourceTree = "<group>"; };
 		AE9DAF0E22C278C6004C9591 /* ChatTitleView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ChatTitleView.swift; sourceTree = "<group>"; };
@@ -659,7 +659,7 @@
 			isa = PBXGroup;
 			children = (
 				AE0AA951247800E700D42A7F /* GalleryCell.swift */,
-				AE8DD450249D1DFB009A4BC1 /* FileTableViewCell.swift */,
+				AE8DD450249D1DFB009A4BC1 /* DocumentGalleryFileCell.swift */,
 			);
 			path = Cell;
 			sourceTree = "<group>";
@@ -1164,7 +1164,7 @@
 				AE52EA20229EB9F000C586C9 /* EditGroupViewController.swift in Sources */,
 				AE18F294228C602A0007B1BE /* SecuritySettingsController.swift in Sources */,
 				AE39D323249CFC1A007346A1 /* DocumentGalleryController.swift in Sources */,
-				AE8DD451249D1DFB009A4BC1 /* FileTableViewCell.swift in Sources */,
+				AE8DD451249D1DFB009A4BC1 /* DocumentGalleryFileCell.swift in Sources */,
 				3095A351237DD1F700AB07F7 /* MediaPicker.swift in Sources */,
 				B21005DB23383664004C70C5 /* SettingsClassicViewController.swift in Sources */,
 				AEC67A1C241CE9E4007DDBE1 /* AppStateRestorer.swift in Sources */,

deltachat-ios/Controller/DocumentGalleryController.swift

@@ -7,7 +7,7 @@ class DocumentGalleryController: UIViewController {
 
     private lazy var tableViews: UITableView = {
         let table = UITableView(frame: .zero, style: .grouped)
-        table.register(FileTableViewCell.self, forCellReuseIdentifier: FileTableViewCell.reuseIdentifier)
+        table.register(DocumentGalleryFileCell.self, forCellReuseIdentifier: DocumentGalleryFileCell.reuseIdentifier)
         table.dataSource = self
         table.delegate = self
         table.rowHeight = 60
@@ -66,7 +66,7 @@ extension DocumentGalleryController: UITableViewDelegate, UITableViewDataSource
     }
 
     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
-        guard let cell = tableView.dequeueReusableCell(withIdentifier: FileTableViewCell.reuseIdentifier, for: indexPath) as? FileTableViewCell else {
+        guard let cell = tableView.dequeueReusableCell(withIdentifier: DocumentGalleryFileCell.reuseIdentifier, for: indexPath) as? DocumentGalleryFileCell else {
             return UITableViewCell()
         }
         let msg = DcMsg(id: fileMessageIds[indexPath.row])

deltachat-ios/View/Cell/FileTableViewCell.swift → deltachat-ios/View/Cell/DocumentGalleryFileCell.swift

@@ -1,9 +1,9 @@
 import UIKit
 import DcCore
 
-class FileTableViewCell: UITableViewCell {
+class DocumentGalleryFileCell: UITableViewCell {
 
-    static let reuseIdentifier = "file_table_view_cell"
+    static let reuseIdentifier = "document_gallery_file_cell"
 
     private let fileImageView: UIImageView = {
         let imageView = UIImageView()
@@ -67,19 +67,9 @@ class FileTableViewCell: UITableViewCell {
 
     // MARK: - update
     func update(msg: DcMsg) {
-       /* switch msg.kind {
-        case .fileText(let mediaItem):
-            if let url = mediaItem.url {
-                generateThumbnailFor(url: url, placeholder: mediaItem.placeholderImage)
-            } else {
-                fileImageView.image = mediaItem.placeholderImage
-            }
-        default:
-            guard let url = msg.fileURL else {
-                return
-            }
-            generateThumbnailFor(url: url, placeholder: nil)
-        }*/
+        if let fileUrl = msg.fileURL {
+            generateThumbnailFor(url: fileUrl, placeholder: UIImage(named: "ic_attach_file_36pt")?.maskWithColor(color: DcColors.grayTextColor))
+        }
         title.text = msg.filename
         subtitle.text = msg.getPrettyFileSize()
     }