fixed bug that made window crash when there were no playlists

src/controllers/song_controller.vala

@@ -15,7 +15,9 @@ namespace Song {
 
         public static SongControls song_controls;
 
-        public static Adw.ApplicationWindow window;
+        public static Song.Window window;
+        
+        public static Adw.ToastOverlay toast_overlay = new Adw.ToastOverlay();
         
     }
 

src/json_config.vala

@@ -87,17 +87,25 @@ namespace Song {
                         // Parse settings from JSON
                         if (json_config.has_member("playlists")) {
                             Json.Object _playlists = json_config.get_object_member("playlists");
-                            print("\n." + _playlists.get_members().data + ".\n");
+                            
-                            // invalid methoud down below
 
                             var members = _playlists.get_members();
+                             
+                            if (members != null) {
                                 members.foreach((member_name) => {
-                                PlaylistObject _playList = new PlaylistObject();
+                                    PlaylistObject? _playList = new PlaylistObject();
                                     var object = _playlists.get_member(member_name).get_object();
+
+                                    if (object != null) {
+                                        
                                         _playList.name = member_name;
                                         // TODO: ADD PROPERTIES _playList.properties = whatever
                                         // TODO: fix item iterator, it is invalid as it calls on each member, not each "object"
-                                var items_object = object.get_object_member("items");
+                                        Json.Object? items_object = null;
+                                        if (object.has_member("items")) {
+                                            items_object = object.get_object_member("items");
+                                        }
+                                        if (items_object != null) {
                                         var items_list = items_object.get_members();
                                             items_list.foreach((item) => {
                                                 PlaylistItem _item = new PlaylistItem();
@@ -113,12 +121,14 @@ namespace Song {
                                                 }
                                                 _playList.items.append(_item);
                                             });
-                                
+                                        }
+                                    }
 
                                     playlists.append(_playList);
                                 }); 
                             } 
                         } 
+                    }
                     loaded();
 
                 } catch (Error e) {

src/widgets/main_view.vala

@@ -86,12 +86,14 @@ namespace Song {
 
             var config = Config.get_instance();
             config.config_changed.connect(() => {
+                if (config.playlists != null) {
                     if (config.playlists.length() == 1) {
                         config.playlists.foreach((i) => {
                             change_page(i);
                             return;
                         });
                     }
+                }
             });
         }
 

src/widgets/playlist.vala

@@ -3,7 +3,7 @@ namespace Song {
 
         private Settings settings = new Settings ("com.liyaowhen.Song");
         
-        private PlaylistObject playlist;
+        public PlaylistObject playlist;
         private Gtk.Button remove_button;
         private Gtk.Revealer remove_button_revealer;
 
@@ -13,10 +13,17 @@ namespace Song {
         }
 
         construct {
+
+
             orientation = Gtk.Orientation.HORIZONTAL;
             add_css_class("toolbar");
             remove_button = new Gtk.Button.from_icon_name("app-remove-symbolic");
 
+            remove_button.clicked.connect(() => {
+                print("clicked");
+                confirm_delete_popup();
+            });
+
             remove_button_revealer = new Gtk.Revealer();
             remove_button_revealer.set_child(remove_button);
             remove_button_revealer.transition_type = Gtk.RevealerTransitionType.SWING_LEFT;
@@ -39,6 +46,7 @@ namespace Song {
                 if (playlist.name != null) {
                     main_button.label = playlist.name;
                 }
+
             });
 
             Config.get_instance().loaded.connect(() => {
@@ -60,5 +68,29 @@ namespace Song {
         public void exit_removal_mode() {
             remove_button_revealer.set_reveal_child(false);
         }
+
+        private void confirm_delete_popup() {
+            
+            
+            var alert_dialog = new Adw.AlertDialog("Remove Playlist?",
+            "Deleting a playlist is a non-reversable action,
+                however the playlist's items will remain intact in the configuration folder");
+            
+            alert_dialog.add_response("Cancel", "Cancel");
+            alert_dialog.add_response("Confirm", "Confirm");
+            alert_dialog.set_response_appearance("Confirm", Adw.ResponseAppearance.DESTRUCTIVE);
+
+            alert_dialog.present(this);
+
+            
+            alert_dialog.response.connect((i, e) => {
+                if (e == "Confirm") {
+                    Config.get_instance().playlists.remove(playlist);
+                    Config.get_instance().save.begin();
+                }
+            });
+            
+            
+        }
     }
 }

src/widgets/side_bar.vala

@@ -60,7 +60,7 @@ namespace Song {
             vexpand_set = true;
             hexpand_set = true;
 
-            PlaylistObject initial_playlist;
+            PlaylistObject? initial_playlist = null;
 
             /*var playlist_names = settings.get_strv("playlists");
             foreach (string _name in playlist_names) {
@@ -75,22 +75,32 @@ namespace Song {
             Config config = Config.get_instance();
             
             bool firstDeclared = false;
-            config.playlists.foreach((_playlist) => {
+            if (config.playlists != null) {
+                foreach (PlaylistObject _playlist in config.playlists) {
                     var button = new PlaylistButton(_playlist);
                     if (!firstDeclared) {initial_playlist = _playlist; firstDeclared = true;}
     
                     playlist_buttons.add(button);
                     append(button);
-            });
+                }
+            }
+
+
+            print("\n aaaaaa" + playlist_buttons.size.to_string() + "\n");
 
             config.config_changed.connect(() => {
-                playlist_buttons.clear();
+                foreach (PlaylistButton e in playlist_buttons) {
+                    print("\n" + e.playlist.name + "eee");
+                    e.destroy();
+                }
+                if (config.playlists != null) {
                     config.playlists.foreach((_playlist) => {
                         var button = new PlaylistButton(_playlist);
         
                         playlist_buttons.add(button);
                         append(button);
                     }); 
+                }
             }); 
 
             Timeout.add(1000, () => {
@@ -105,9 +115,10 @@ namespace Song {
             //print("sidbar requesting main_view_content switch to playlist of name:\n" + playlists.nth_data(0).name);
             Timeout.add(1, () => {
                 if (SongController.main_view_content != null) {
+                    if (initial_playlist != null) {
                         SongController.main_view_content.change_page(initial_playlist);
                         return false;
-
+                    }
                 }
                 return true;
             }, 1);
@@ -163,16 +174,17 @@ namespace Song {
                         print("\n sidebar buttons are null");
                     }
                     if (i.get_active()) {
-                        sidebar_content.playlist_buttons.foreach((e) => {
+                        foreach (PlaylistButton e in sidebar_content.playlist_buttons) {
                             e.enter_removal_mode();
-                            print(e.name);
+                            print(e.playlist.name);
-                        });
-                    } else {
-                        sidebar_content.playlist_buttons.foreach((e) => {
-                            e.exit_removal_mode();
-                            print(e.name);
-                        });
                         }
+                    } else {
+                        foreach (PlaylistButton e in sidebar_content.playlist_buttons) {
+                            e.exit_removal_mode();
+                            print(e.playlist.name);
+                        }
+                    }
+                    print("\n" + sidebar_content.playlist_buttons.size.to_string() + "\n");
                 });
                 
 

src/window.vala

@@ -5,6 +5,7 @@ namespace Song {
         private Settings settings = new Settings ("com.liyaowhen.Song");
         public SideBar sidebar;
         public MainView main_view;
+        public Gtk.ShortcutAction ctrl_z = new Gtk.SignalAction("ctrl_z");
 
         public Window (Gtk.Application app) {
             Object (application: app);
@@ -70,6 +71,11 @@ namespace Song {
             _content.add_top_bar (title_bar);
             _content.set_content (split_view);
             
+            var controller = new Gtk.ShortcutController();
+            Gtk.ShortcutTrigger trigger = Gtk.ShortcutTrigger.parse_string("<Control>Z");
+            controller.add_shortcut(new Gtk.Shortcut(trigger, ctrl_z));
+            add_controller(new Gtk.ShortcutController());
+
             
             collapse_button.clicked.connect(() => {
                 if(split_view.get_collapsed ()){