public override DragDropEffects InitiateDrag(IDataObject draggedData, DragDropEffects allowedEffects,
LocalDragEventArgs args)
{
DataObject = draggedData;
DragArgs = args;
EffectsIn = allowedEffects;
return(EffectsOut);
}
private void OnMouseMoved(object?sender, LocalDragEventArgs e)
{
if (TryHandleIsMouseDownEvent(e))
{
return;
}
TryHandleDragDeltaRange(sender, e);
SendEvent(sender, e);
}
private bool TryHandleIsMouseDownEvent(LocalDragEventArgs e)
{
if (e.MessageType == MouseMessageType.Down)
{
mouseDownEventPendingDragActivation = e;
return(true);
}
return(false);
}
private void TryHandleDragDeltaRange(object?sender, LocalDragEventArgs e)
{
if (mouseDownEventPendingDragActivation == null)
{
return;
}
var offset = mouseDownEventPendingDragActivation.TransformedPoint - e.TransformedPoint;
if (Math.Abs(offset.X) >= xTol || Math.Abs(offset.Y) >= yTol)
{
SendEvent(sender, mouseDownEventPendingDragActivation);
mouseDownEventPendingDragActivation = null;
}
}
public override DragDropEffects InitiateDrag(IDataObject draggedData, DragDropEffects allowedEffects,
LocalDragEventArgs args) => new DragHandler(this, args).InitiateDrag(draggedData, allowedEffects);
public void MouseMoved(LocalDragEventArgs e)
{
LastArgs = e;
}
private void SendEvent(object?sender, LocalDragEventArgs e)
{
MouseMoved?.Invoke(sender, e);
}
public abstract DragDropEffects InitiateDrag(IDataObject draggedData, DragDropEffects allowedEffects,
LocalDragEventArgs args);