/* todo: maybe have to handle oncapturelost, doing some type of pointer release stuff, in case an ancestor steals control
* https://github.com/AvaloniaUI/Avalonia/issues/2586
*/
public void DraggablePointerPressed(PointerPressedEventArgs e)
{
/*
* if a descendant is pressed,
* it will be the "captured" control for the life of the drag operation,
* so rn we are transferring capture.
* if this ever doesn't work i think we can just fix it by listening for
* InputElement.PointerMoved and InputElement.PointerReleased events even with the Handled property set to true
*/
if (dragOp != null)
{
/* this is likely A:
* common(unavoidable?) issue where a pointer release event is not fired.
* or B:
* this is a different pointing device from the first.
* EITHER WAY the easiest way to handle this is to just:
* CANCEL the old drag.
*/
dragOp.Dispose();
dragOp = null;
draggable.InvalidateVisual();
e.Pointer.Capture(null);
}
else
{
if (e.Pointer.Captured != draggable)
{
e.Pointer.Capture(draggable);
}
dragOp = dragFactory(draggable, e.GetPosition(draggable));
}
e.Handled = true;
}