private static void DragSource_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (_isMouseDown && IsDragGesture(e.GetPosition(CurrentDragSourceAdvisor.GetSourceTopContainer())))
{
DragStarted(sender as UIElement);
}
}
private static void DragSource_PreviewMouseUp(object sender, MouseButtonEventArgs e)
{
if (_isMouseDown && IsDragGesture(e.GetPosition(CurrentDragSourceAdvisor.GetSourceTopContainer())))
{
_isMouseDown = false;
Mouse.Capture(null);
}
}
private static void DragSource_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// Make this the new drag source
CurrentDragSourceAdvisor = GetDragSourceAdvisor(sender as DependencyObject);
if (CurrentDragSourceAdvisor.IsDraggable(e.Source as UIElement, e.GetPosition(CurrentDragSourceAdvisor.GetSourceTopContainer())))
{
_draggedElt = e.Source as UIElement;
_dragStartPoint = e.GetPosition(CurrentDragSourceAdvisor.GetSourceTopContainer());
_offsetPoint = e.GetPosition(_draggedElt);
_isMouseDown = true;
e.Handled = true;
}
e.Handled = false;
}