added spacing at the end of the form and delete button for alarms

lib/pages/task_edit_page.dart

@@ -168,14 +168,27 @@ class _TaskEditPageState extends State<TaskEditPage> {
                       icon: Icon(Icons.location_on),
                     ),
                     for (final (index, alarmRequest) in alarmRequests.indexed)
-                      AlarmForm(
-                        request: alarmRequest,
-                        onChanged: (updated) {
-                          setState(() {
-                            alarmRequests[index] = updated;
-                          });
-                        },
+                      Row(
+                        children: [
+                          Expanded(
+                            child: AlarmForm(
+                              request: alarmRequest,
+                              onChanged: (updated) {
+                                setState(() {
+                                  alarmRequests[index] = updated;
+                                });
+                              },
+                            ),
+                          ),
+                          IconButton(
+                            onPressed: () => setState(() {
+                              alarmRequests.removeAt(index);
+                            }),
+                            icon: Icon(Icons.close),
+                          ),
+                        ],
                       ),
+                    SizedBox(height: 120),
                   ],
                 ),
               ],
@@ -191,32 +204,34 @@ class _TaskEditPageState extends State<TaskEditPage> {
   }
 
   void onSavePressed() {
-    Navigator.of(context).pop(
-      CreateTaskRequest(
-        title: titleController.text,
-        description: descriptionController.text,
-        start: null,
-        due: DateTime.tryParse(
-          '${dueDateController.text} ${dueTimeController.text}'.trim(),
+    if (formKey.currentState!.validate()) {
+      Navigator.of(context).pop(
+        CreateTaskRequest(
+          title: titleController.text,
+          description: descriptionController.text,
+          start: null,
+          due: DateTime.tryParse(
+            '${dueDateController.text} ${dueTimeController.text}'.trim(),
+          ),
+          isCompleted: false,
+          category: categoryController.text,
+          subtasks: [],
+          url: urlController.text,
+          alarms: alarmRequests.map<Alarm>((e) {
+            if (e is CreateFixedTimeAlarmRequest) {
+              return e.toAlarm(generateId());
+            }
+            if (e is CreateRelativeTimeAlarmRequest) {
+              return e.toAlarm(generateId());
+            }
+            if (e is LocationAlarm) {
+              return e.toAlarm(generateId());
+            }
+            throw TypeError();
+          }).toList(),
         ),
-        isCompleted: false,
-        category: categoryController.text,
-        subtasks: [],
-        url: urlController.text,
-        alarms: alarmRequests.map<Alarm>((e) {
-          if (e is CreateFixedTimeAlarmRequest) {
-            return e.toAlarm(generateId());
-          }
-          if (e is CreateRelativeTimeAlarmRequest) {
-            return e.toAlarm(generateId());
-          }
-          if (e is LocationAlarm) {
-            return e.toAlarm(generateId());
-          }
-          throw TypeError();
-        }).toList(),
-      ),
-    );
+      );
+    }
   }
 
   void onPopInvoked(bool didPop, Object? result) {

lib/widgets/alarm_widgets/fixed_time_alarm_form.dart

@@ -69,7 +69,9 @@ class _FixedTimeAlarmFormState extends State<FixedTimeAlarmForm> {
                 icon: Icon(Icons.calendar_month),
               ),
             ),
-            validator: dateTimeValidator,
+            validator: (value) {
+              return notEmptyValidator(value) ?? dateTimeValidator(value);
+            },
             keyboardType: TextInputType.datetime,
             textInputAction: TextInputAction.next,
           ),