Improve local comics selection logic.

lib/components/comic.dart

@@ -581,10 +581,13 @@ class SliverGridComics extends StatefulWidget {
     this.badgeBuilder,
     this.menuBuilder,
     this.onTap,
+    this.selections
   });
 
   final List<Comic> comics;
 
+  final Map<Comic, bool>? selections;
+
   final void Function()? onLastItemBuild;
 
   final String? Function(Comic)? badgeBuilder;
@@ -638,6 +641,7 @@ class _SliverGridComicsState extends State<SliverGridComics> {
   Widget build(BuildContext context) {
     return _SliverGridComics(
       comics: comics,
+      selection: widget.selections,
       onLastItemBuild: widget.onLastItemBuild,
       badgeBuilder: widget.badgeBuilder,
       menuBuilder: widget.menuBuilder,
@@ -653,10 +657,13 @@ class _SliverGridComics extends StatelessWidget {
     this.badgeBuilder,
     this.menuBuilder,
     this.onTap,
+    this.selection,
   });
 
   final List<Comic> comics;
 
+  final Map<Comic, bool>? selection;
+
   final void Function()? onLastItemBuild;
 
   final String? Function(Comic)? badgeBuilder;
@@ -674,11 +681,37 @@ class _SliverGridComics extends StatelessWidget {
             onLastItemBuild?.call();
           }
           var badge = badgeBuilder?.call(comics[index]);
-          return ComicTile(
+          return Stack(
+            children: [
+              ComicTile(
                 comic: comics[index],
                 badge: badge,
                 menuOptions: menuBuilder?.call(comics[index]),
                 onTap: onTap != null ? () => onTap!(comics[index]) : null,
+              ),
+              Positioned(
+                bottom: 10,
+                right: 8,
+                child: Visibility(
+                  visible: selection == null ? false : selection![comics[index]] ?? false,
+                  child: Stack(
+                    children: [
+                      Transform.scale(
+                        scale: 0.9,
+                        child: const Icon(
+                          Icons.circle_rounded,
+                          color: Colors.white,
+                        )
+                      ),
+                      const Icon(
+                        Icons.check_circle_rounded,
+                        color: Colors.green,
+                      )
+                    ],
+                  )
+                )
+              )
+            ],
           );
         },
         childCount: comics.length,

lib/pages/local_comics_page.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:venera/components/components.dart';
 import 'package:venera/foundation/app.dart';
 import 'package:venera/foundation/appdata.dart';
+import 'package:venera/foundation/comic_source/comic_source.dart';
 import 'package:venera/foundation/local.dart';
 import 'package:venera/pages/downloading_page.dart';
 import 'package:venera/utils/cbz.dart';
@@ -26,7 +27,7 @@ class _LocalComicsPageState extends State<LocalComicsPage> {
 
   bool multiSelectMode = false;
 
-  Map<LocalComic, bool> selectedComics = {};
+  Map<Comic, bool> selectedComics = {};
 
   void update() {
     if (keyword.isEmpty) {
@@ -166,10 +167,66 @@ class _LocalComicsPageState extends State<LocalComicsPage> {
             )
           else if (multiSelectMode)
             SliverAppbar(
-              title: Text("Selected ${selectedComics.length} comics"),
+              title: Text("Selected @c comics".tlParams({"c": selectedComics.length})),
               actions: [
+                IconButton(
+                  icon: const Icon(Icons.check_box_rounded),
+                  tooltip: "Select All".tl,
+                  onPressed: () {
+                    setState(() {
+                      selectedComics = comics.asMap().map((k, v) => MapEntry(v, true));
+                    });
+                  },
+                ),
+                IconButton(
+                  icon: const Icon(Icons.check_box_outline_blank_outlined),
+                  tooltip: "Deselect".tl,
+                  onPressed: () {
+                    setState(() {
+                      selectedComics.clear();
+                    });
+                  },
+                ),
+                IconButton(
+                  icon: const Icon(Icons.check_box_outlined),
+                  tooltip: "Invert Selection".tl,
+                  onPressed: () {
+                    setState(() {
+                      comics.asMap().forEach((k, v) {
+                        selectedComics[v] = !selectedComics.putIfAbsent(v, () => false);
+                      });
+                      selectedComics.removeWhere((k, v) => !v);
+                    });
+                  },
+                ),
+                
+                IconButton(
+                  icon: const Icon(Icons.indeterminate_check_box_rounded),
+                  tooltip: "Select in range".tl,
+                  onPressed: () {
+                    setState(() {
+                      List<int> l = [];
+                      selectedComics.forEach((k, v) {
+                        l.add(comics.indexOf(k as LocalComic));
+                      });
+                      if(l.isEmpty) {
+                        return;
+                      }
+                      l.sort();
+                      int start = l.first;
+                      int end = l.last;
+                      selectedComics.clear();
+                      selectedComics.addEntries(
+                        List.generate(end - start + 1, (i) {
+                          return MapEntry(comics[start + i], true);
+                        })
+                      );
+                    });
+                  },
+                ),
                 IconButton(
                   icon: const Icon(Icons.close),
+                  tooltip: "Exit Multi-Select".tl,
                   onPressed: () {
                     setState(() {
                       multiSelectMode = false;
@@ -177,6 +234,7 @@ class _LocalComicsPageState extends State<LocalComicsPage> {
                     });
                   },
                 ),
+                
               ],
             )
           else if (searchMode)
@@ -207,13 +265,14 @@ class _LocalComicsPageState extends State<LocalComicsPage> {
             ),
           SliverGridComics(
             comics: comics,
+            selections: selectedComics,
             onTap: multiSelectMode
                 ? (c) {
                     setState(() {
                       if (selectedComics.containsKey(c as LocalComic)) {
-                        selectedComics.remove(c as LocalComic);
+                        selectedComics.remove(c);
                       } else {
-                        selectedComics[c as LocalComic] = true;
+                        selectedComics[c] = true;
                       }
                     });
                   }
@@ -226,23 +285,54 @@ class _LocalComicsPageState extends State<LocalComicsPage> {
                     icon: Icons.delete,
                     text: "Delete".tl,
                     onClick: () {
-                      if (multiSelectMode) {
+                      showDialog(
-                        showConfirmDialog(
                         context: context,
+                        builder: (context) {
+                          bool removeComicFile = true;
+                          return StatefulBuilder(
+                            builder: (context, state) {
+                              return ContentDialog(
                                 title: "Delete".tl,
-                          content: "Delete selected comics?".tl,
+                                content: Column(
-                          onConfirm: () {
+                                  children: [
+                                    Text("Delete selected comics?".tl).paddingVertical(8),
+                                    Transform.scale(
+                                      scale: 0.9, 
+                                      child: CheckboxListTile(
+                                        title: Text("Also remove files on disk".tl),
+                                        value: removeComicFile,
+                                        onChanged: (v) { 
+                                          state(() {
+                                            removeComicFile = !removeComicFile; 
+                                          });
+                                        }
+                                      )
+                                    ),
+                                  ],
+                                ).paddingHorizontal(16).paddingVertical(8),
+                                actions: [
+                                  FilledButton(
+                                    onPressed: () {
+                                      context.pop();
+                                      if(multiSelectMode) {
                                         for (var comic in selectedComics.keys) {
-                              LocalManager().deleteComic(comic);
+                                          LocalManager().deleteComic(comic as LocalComic, removeComicFile);
                                         }
                                         setState(() {
                                           selectedComics.clear();
                                         });
-                          },
-                        );
                                       } else {
-                        LocalManager().deleteComic(c as LocalComic);
+                                        LocalManager().deleteComic(c as LocalComic, removeComicFile);
                                       }
+                                    },
+                                    child: Text("Confirm".tl),
+                                  ),
+                                ],
+                              );
+                            }
+                          );
+                        }
+                      );
                     }),
                 MenuEntry(
                     icon: Icons.outbox_outlined,
@@ -255,7 +345,7 @@ class _LocalComicsPageState extends State<LocalComicsPage> {
                       try {
                         if (multiSelectMode) {
                           for (var comic in selectedComics.keys) {
-                            var file = await CBZ.export(comic);
+                            var file = await CBZ.export(comic as LocalComic);
                             await saveFile(filename: file.name, file: file);
                             await file.delete();
                           }