private void registerReceivers()
{
// item added
MessagingCenter.Subscribe <DataStorage, ToDoItem>(this, MessengerKeys.ItemAdded, (_, item) =>
{
Groups[item.IsChecked ? 1 : 0].Insert(0, new ToDoItemViewModel(item));
});
// item changed
MessagingCenter.Subscribe <DataStorage, ToDoItem>(this, MessengerKeys.ItemChanged, (_, item) =>
{
for (var groupIndex = 0; groupIndex < Groups.Count; groupIndex++)
{
for (var itemIndex = 0; itemIndex < Groups[groupIndex].Count; itemIndex++)
{
if (item.Id == Groups[groupIndex][itemIndex].Item.Id)
{
var targetGroupIndex = item.IsChecked ? 1 : 0;
if (groupIndex == targetGroupIndex)
{
Groups[groupIndex][itemIndex] = new ToDoItemViewModel(item);
}
else
{
Groups[groupIndex].RemoveAt(itemIndex);
Groups[targetGroupIndex].Insert(0, new ToDoItemViewModel(item));
}
return;
}
}
}
});
// item deleted
MessagingCenter.Subscribe <DataStorage, int>(this, MessengerKeys.ItemDeleted, (_, itemId) =>
{
for (var groupIndex = 0; groupIndex < Groups.Count; groupIndex++)
{
for (var itemIndex = 0; itemIndex < Groups[groupIndex].Count; itemIndex++)
{
if (itemId == Groups[groupIndex][itemIndex].Item.Id)
{
Groups[groupIndex].RemoveAt(itemIndex);
return;
}
}
}
});
}
public ToDoDetailPage(ToDoItemViewModel viewModel)
{
BindingContext = viewModel;
InitializeComponent ();
}