public async Task SendDrop(DropEventArgs args)
{
if (!AllowDrop)
{
return;
}
DropCommand?.Execute(DropCommandParameter);
Drop?.Invoke(this, args);
if (!args.Handled)
{
var dataView = args.Data;
var internalProperties = dataView.PropertiesInternal;
VisualElement dragSource = null;
ImageSource sourceTarget = await dataView.GetImageAsync();
string text = await dataView.GetTextAsync();
if (internalProperties.ContainsKey("DragSource"))
{
dragSource = (VisualElement)internalProperties["DragSource"];
if (sourceTarget == null && dragSource is IImageElement imageElement)
{
sourceTarget = imageElement.Source;
}
if (String.IsNullOrWhiteSpace(text))
{
text = dragSource.GetStringValue();
}
}
if (Parent is IImageElement && sourceTarget == null)
{
sourceTarget = text;
}
if (Parent is Image image)
{
image.Source = sourceTarget;
}
else if (Parent is ImageButton ib)
{
ib.Source = sourceTarget;
}
else if (Parent is Button b)
{
b.ImageSource = sourceTarget;
}
Parent?.TrySetValue(text);
}
}
void DropGestureRecognizer_Drop(System.Object sender, Xamarin.Forms.DropEventArgs e)
{
StackLayout sl = ((StackLayout)(sender as DropGestureRecognizer).Parent);
sl.BackgroundColor = Color.LightGray;
// add new box to the stack
var btn = new Button();
btn.BackgroundColor = (Color)e.Data.Properties["Color"];
sl.Children.Add(btn);
btn.Clicked += ButtonRemove_Clicked;
}
void DoneDropGestureRecognizer_Drop(System.Object sender, Xamarin.Forms.DropEventArgs e)
{
var id = (string)e.Data.Properties["Id"];
ViewModel.DoneDrop(id);
}
private void DropGestureRecognizer_Drop_Collection(System.Object sender, Xamarin.Forms.DropEventArgs e)
{
// We handle reordering login in our view model
e.Handled = true;
}