internal static void StartDrag(object sender, HoldingRoutedEventArgs e, DragDropTrigger trigger, object initializeContext = null)
{
var dragDropElement = sender as IDragDropElement;
if (GetRunningOperation(dragDropElement as DependencyObject) != null)
{
return;
}
var uiSource = sender as UIElement;
var frameworkElementSource = sender as FrameworkElement;
double leftMargin = 0d;
double topMargin = 0d;
if (frameworkElementSource != null)
{
leftMargin = frameworkElementSource.Margin.Left;
topMargin = frameworkElementSource.Margin.Top;
}
if (dragDropElement == null || !dragDropElement.CanStartDrag(trigger, initializeContext))
{
return;
}
var context = dragDropElement.DragStarting(trigger, initializeContext);
var startDragPosition = e.GetPosition(context.DragSurface.RootElement);
var relativeStartDragPosition = e.GetPosition(uiSource);
relativeStartDragPosition = new Point(relativeStartDragPosition.X + leftMargin, relativeStartDragPosition.Y + topMargin);
var dragPositionMode = DragDrop.GetDragPositionMode(uiSource);
AddOperation(new DragDropOperation(context, dragDropElement, dragPositionMode, null, startDragPosition, relativeStartDragPosition));
}
internal static void StartDrag(object sender, PointerRoutedEventArgs e, DragDropTrigger trigger, object initializeContext = null)
{
var dragDropElement = sender as IDragDropElement;
var uiSource = sender as UIElement;
if (dragDropElement == null)
{
dragDropElement = ElementTreeHelper.FindVisualAncestor <IDragDropElement>(uiSource);
}
if (GetRunningOperation(dragDropElement as DependencyObject) != null)
{
return;
}
UIElement uiDragDropElement = dragDropElement as UIElement;
var frameworkElementSource = dragDropElement as FrameworkElement;
double leftMargin = 0d;
double topMargin = 0d;
if (frameworkElementSource != null)
{
leftMargin = frameworkElementSource.Margin.Left;
topMargin = frameworkElementSource.Margin.Top;
}
if (dragDropElement == null || !dragDropElement.CanStartDrag(trigger, initializeContext))
{
return;
}
var context = dragDropElement.DragStarting(trigger, initializeContext);
if (context == null)
{
return;
}
var startDragPosition = e.GetCurrentPoint(context.DragSurface.RootElement).Position;
var relativeStartDragPosition = e.GetCurrentPoint(uiDragDropElement).Position;
var dragPositionMode = DragDrop.GetDragPositionMode(uiDragDropElement);
AddOperation(new DragDropOperation(context, dragDropElement, dragPositionMode, e.Pointer, startDragPosition, relativeStartDragPosition));
}
internal static void StartDrag(object sender, PointerRoutedEventArgs e)
{
var dragDropElement = sender as IDragDropElement;
var uiSource = sender as UIElement;
if (dragDropElement == null || !dragDropElement.CanStartDrag())
{
return;
}
var context = dragDropElement.DragStarting();
var startDragPosition = e.GetCurrentPoint(context.DragSurface.RootElement).Position;
var relativeStartDragPosition = e.GetCurrentPoint(uiSource).Position;
var dragPositionMode = DragDrop.GetDragPositionMode(uiSource);
runningOperations.Add(new DragDropOperation(context, dragDropElement, dragPositionMode, e.Pointer, startDragPosition, relativeStartDragPosition));
}
