/// <summary>
/// Start of the Drag and Drop operation: we set some content and change the DragUI
/// depending on the selected options
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private async void SourceGrid_DragStarting(Windows.UI.Xaml.UIElement sender, Windows.UI.Xaml.DragStartingEventArgs args)
{
args.Data.SetText(SourceTextBox.Text);
if ((bool)DataPackageRB.IsChecked)
{
// Standard icon will be used as the DragUIContent
args.DragUI.SetContentFromDataPackage();
}
else if ((bool)CustomContentRB.IsChecked)
{
// Generate a bitmap with only the TextBox
// We need to take the deferral as the rendering won't be completed synchronously
var deferral = args.GetDeferral();
var rtb = new RenderTargetBitmap();
await rtb.RenderAsync(SourceTextBox);
var buffer = await rtb.GetPixelsAsync();
var bitmap = SoftwareBitmap.CreateCopyFromBuffer(buffer,
BitmapPixelFormat.Bgra8,
rtb.PixelWidth,
rtb.PixelHeight,
BitmapAlphaMode.Premultiplied);
args.DragUI.SetContentFromSoftwareBitmap(bitmap);
deferral.Complete();
}
// else just show the dragged UIElement
}
void HandleDragStarting(UIElement sender, Windows.UI.Xaml.DragStartingEventArgs e)
{
SendEventArgs <DragGestureRecognizer>(rec =>
{
if (!rec.CanDrag)
{
e.Cancel = true;
return;
}
var renderer = sender as IVisualElementRenderer;
var args = rec.SendDragStarting(renderer?.Element);
e.Data.Properties["_XFPropertes_DONTUSE"] = args.Data;
if (!args.Handled && renderer != null)
{
if (renderer.GetNativeElement() is Windows.UI.Xaml.Controls.Image nativeImage &&
nativeImage.Source is BitmapImage bi && bi.UriSource != null)
{
e.Data.SetBitmap(RandomAccessStreamReference.CreateFromUri(bi.UriSource));
}
else if (!String.IsNullOrWhiteSpace(args.Data.Text))
{
Uri uri;
if (Uri.TryCreate(args.Data.Text, UriKind.Absolute, out uri))
{
if (args.Data.Text.StartsWith("http", StringComparison.OrdinalIgnoreCase))
{
e.Data.SetWebLink(uri);
}
else
{
e.Data.SetApplicationLink(uri);
}
}
else
{
e.Data.SetText(args.Data.Text);
}
}
}
e.Cancel = args.Cancel;
e.AllowedOperations = Windows.ApplicationModel.DataTransfer.DataPackageOperation.Copy;
});
/// <summary>
/// DragStarting is called even if we are starting the Drag Operation ourselved with StartDragAsync
/// In this sample, we don't really need to handle it
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void SourceTextBlock_DragStarting(Windows.UI.Xaml.UIElement sender, Windows.UI.Xaml.DragStartingEventArgs e)
{
e.Data.RequestedOperation = DataPackageOperation.Copy;
e.Data.SetText(_symbol);
}
private void Draggable_DragStarting(UIElement sender, Windows.UI.Xaml.DragStartingEventArgs args)
{
args.Data.SetText("Test Item");
args.Data.RequestedOperation = DataPackageOperation.Copy;
Results.Text = "Drag started";
}
