Moved button for deleting subject to edit dialog

Author: leolost2605

src/application.vala

@@ -23,7 +23,7 @@ public class MyApp : Adw.Application {
             { "preferences", this.on_preferences_action },
             { "help", this.on_help_action },
             { "about", this.on_about_action },
-            { "newsubject", this.on_newsubject_action}
+            { "newsubject", this.on_newsubject_action},
         };
         this.add_action_entries (action_entries, this);
     }
@@ -252,11 +252,27 @@ public class MyApp : Adw.Application {
 
 
     public void edit_subject_dialog (int index) {
-        var dialog = new EditSubjectDialog (main_window, subjects[index]);
+        var dialog = new EditSubjectDialog (main_window, subjects[index], this);
 
         dialog.response.connect ((response_id) => {
             if (response_id == Gtk.ResponseType.ACCEPT) {
-                subjects[index] = dialog.subject;
+                if(dialog.subject != null) {
+                        subjects[index] = dialog.subject;
+                } else {
+                    subjects[index] = null;
+
+                    for (int i = index; i < subjects.length - 1; i++) {
+                        subjects[i] = subjects[i + 1];
+                    }
+
+                    subjects[subjects.length - 1] = null;
+
+                    if (subjects[index] != null) {
+                        window_stack_ui (index);
+                    } else {
+                        window_stack_ui (index - 1);
+                    }
+                }
             }
             dialog.destroy ();
         });
@@ -351,10 +367,6 @@ public class MyApp : Adw.Application {
             var edit_subject_button = new EditSubjectButton (i) {margin_end = 20};
             bottom_end_box.append (edit_subject_button);
 
-            var delete_subject_button = new DeleteSubjectButton (i);
-            delete_subject_button.add_css_class ("destructive-action");
-            bottom_end_box.append (delete_subject_button);
-
 
             //CALL LISTBOX WITH GRADES
             window_grade_rows_ui (i);
@@ -369,10 +381,6 @@ public class MyApp : Adw.Application {
                 new_grade_dialog (new_grade_button.index);
             });
 
-            delete_subject_button.clicked.connect (() => {
-                delete_subject (delete_subject_button.index);
-            });
-
             edit_subject_button.clicked.connect (() => {
                 edit_subject_dialog (edit_subject_button.index);
             });
@@ -504,27 +512,6 @@ public class MyApp : Adw.Application {
     }
 
 
-
-
-    public void delete_subject (int index) {
-        subjects[index] = null;
-
-        for (int i = index; i < subjects.length - 1; i++) {
-            subjects[i] = subjects[i + 1];
-        }
-
-        subjects[subjects.length - 1] = null;
-
-        if (subjects[index] != null) {
-            window_stack_ui (index);
-        } else {
-            window_stack_ui (index - 1);
-        }
-    }
-
-
-
-
     protected override void activate () {
         main_window = new Adw.ApplicationWindow (this) {
             default_height = 600,

src/edit-subject-button.vala

@@ -6,4 +6,4 @@ public class EditSubjectButton : Gtk.Button {
         index = i;
         halign = END;
     }
-}
+}

src/edit-subject-dialog.vala

@@ -2,7 +2,7 @@ public class EditSubjectDialog : Gtk.Dialog {
     public Subject subject;
     public Gtk.ScrolledWindow scroll_container;
 
-    public EditSubjectDialog (Adw.ApplicationWindow parent, Subject s) {
+    public EditSubjectDialog (Adw.ApplicationWindow parent, Subject s, Adw.Application app) {
         Object (
             modal: true,
             title: "Edit Subject",
@@ -48,6 +48,24 @@ public class EditSubjectDialog : Gtk.Dialog {
         };
         bottom_box.append (new_cat_button);
 
+        var bottom_delete_box = new Gtk.Box (HORIZONTAL, 0) {
+            margin_start = 20,
+            margin_end = 20,
+            margin_bottom = 20,
+            homogeneous = true
+        };
+        main_box.append(bottom_delete_box);
+
+        var subject_delete_button = new Gtk.Button.with_label("Delete subject") {
+                halign = END
+            };
+        subject_delete_button.add_css_class("destructive-action");
+        bottom_delete_box.append(subject_delete_button);
+
+        subject_delete_button.clicked.connect (() => {
+                subject = null;
+            });
+
         new_cat_button.clicked.connect (() => {
             var dialog = new AddCategoryDialog (this);