Add new 'Add task/event' bar directly in the main view

ui/Backend.slint

@@ -1,6 +1,42 @@
 import { Date, Time } from "std-widgets.slint";
 
+export struct NewTaskData {
+	sourceId: int,
+	eventId: int,
+	title: string,
+	scheduled: bool,
+	date: Date
+}
 
+export struct SaveTaskData {
+	sourceId: int,
+	id: int,
+	title: string,
+	scheduled: bool,
+	date: Date,
+}
+
+export struct NewEventParams {
+	sourceId: int,
+	title: string,
+	date: Date,
+	startsAt: Time,
+	endsAt: Time
+}
+
+export struct SaveEventParams {
+	sourceId: int,
+	id: int,
+	title: string,
+	date: Date,
+	startsAt: Time,
+	endsAt: Time
+}
+
+export struct Source {
+	name: string,
+	selected: bool
+}
 
 export struct TaskData {
 	sourceId: int,
@@ -36,7 +72,9 @@ struct OpenNewTaskFormParams {
 }
 
 export global Backend  {
+    in-out property<[Source]> sources-selected; 
     in-out property<[string]> sources;
+	in-out property<bool> no-source-selected;
 	in-out property<[string]> tags;
 	in-out property<[Day]> visible_tasks;
 	in-out property<[TaskData]> unscheduled-tasks;
@@ -53,5 +91,10 @@ export global Backend  {
 	callback delete_task_clicked(int, int);
 	callback delete_event_clicked(int, int);
 
+	callback createTask(NewTaskData);
+	callback saveTask(SaveTaskData);
+	callback createEvent(NewEventParams);
+	callback saveEvent(SaveEventParams);
+
 	pure callback formatDate(Date) -> string;
 }