public ListViewModel()
{
_db = App.Db;
Title = "List";
LoadCommand = new Command(
async() => {
IsBusy = true;
Students = new ObservableCollection <Student>(await _db.GetItemsAsync());
IsBusy = false;
}
);
LoadClassesCommand = new Command(
async() => {
IsBusy = true;
Classrooms = new ObservableCollection <Classroom>(await _db.GetClassroomsAsync());
IsBusy = false;
}
);
MessagingCenter.Subscribe <NewItemPage>(this, "UpdateStudents", (sender) =>
{
LoadCommand.Execute(null);
});
MessagingCenter.Subscribe <ItemDetailPage>(this, "UpdateStudents", (sender) =>
{
LoadCommand.Execute(null);
});
MessagingCenter.Subscribe <EditItemPage>(this, "UpdateStudents", (sender) =>
{
LoadCommand.Execute(null);
});
MessagingCenter.Subscribe <NewItemPage, Student>(this, "AddStudent", async(sender, student) =>
{
if (!await _db.AddItemAsync(student))
{
MessagingCenter.Send(this, "ShowAlert", "There was an error.");
}
});
MessagingCenter.Subscribe <EditItemPage, Student>(this, "EditStudent", async(sender, student) =>
{
if (!await _db.UpdateItemAsync(student))
{
MessagingCenter.Send(this, "ShowAlert", "There was an error.");
}
});
MessagingCenter.Subscribe <ItemDetailPage, int>(this, "DeleteStudent", async(sender, id) =>
{
if (!await _db.DeleteItemAsync(id))
{
MessagingCenter.Send(this, "ShowAlert", "There was an error.");
}
});
}