private static void PreviewDragStartCommandPropertyChangedCallBack(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
var visual = o as FrameworkElement;
if (visual != null)
{
visual.PreviewMouseLeftButtonDown += (sender, args) =>
{
DragDropHelpers.LastMouseDownVisual = visual;
DragDropHelpers.LastMouseDown = args.GetPosition(null);
var itemsControl = visual as System.Windows.Controls.ItemsControl;
if (itemsControl != null)
{
if (MultiSelectDragDropBehavior.GetAllowMultiSelectDragDrop(itemsControl))
{
MultiSelectDragDropBehavior.ItemsControlPreviewMouseLeftButtonDown(itemsControl, args);
}
}
};
visual.MouseMove += (sender, args) =>
{
if (!DragDropHelpers.InDragOperation && (DragDropHelpers.LastMouseDownVisual == visual) && (args.LeftButton == System.Windows.Input.MouseButtonState.Pressed))
{
try
{
DragDropHelpers.InDragOperation = DragDropHelpers.DragStarted(args.GetPosition(null));
if (DragDropHelpers.InDragOperation)
{
var command = GetPreviewDragStartCommand(visual);
if (command.CanExecute(args))
{
command.Execute(args);
var dragData = new DataObject(command.Format, command.Data);
var itemsControl = visual as System.Windows.Controls.ItemsControl;
if ((itemsControl != null) && DragDropRearrangeBehavior.GetAllowsDragDropRearrange(itemsControl))
{
dragData.SetData(DragDropHelpers.DragDropFeedbackDataFormat, new DragDropFeedback());
}
var effects = DragDrop.DoDragDrop(visual, dragData, command.Effects);
if (dragData.GetDataPresent(DragDropHelpers.DragDropFeedbackDataFormat))
{
var dragDropFeedback = dragData.GetData(DragDropHelpers.DragDropFeedbackDataFormat) as IDragDropFeedback;
if (dragDropFeedback != null)
{
dragDropFeedback.DropLocation = DropOnItemLocation.None;
}
INTV.Shared.View.DropItemLocationAdorner.Update(visual, dragDropFeedback, true);
}
}
}
}
finally
{
DragDropHelpers.InDragOperation = false;
}
}
};
}
}
private static void HandleDrop(object sender, DragEventArgs args)
{
var visual = sender as UIElement;
GetDropCommand(visual).Execute(args);
var itemsControl = visual as System.Windows.Controls.ItemsControl;
if ((itemsControl != null) && DragDropRearrangeBehavior.GetAllowsDragDropRearrange(itemsControl))
{
var dragDropFeedback = args.Data.GetData(DragDropHelpers.DragDropFeedbackDataFormat) as IDragDropFeedback;
if (dragDropFeedback != null)
{
dragDropFeedback.DropLocation = DropOnItemLocation.None;
}
INTV.Shared.View.DropItemLocationAdorner.Update(itemsControl, dragDropFeedback, true);
}
args.Handled = true;
}
private static void HandleDragOver(object sender, DragEventArgs args)
{
var visual = sender as FrameworkElement;
IDragDropFeedback dragDropFeedback = null;
if (args.Data.GetDataPresent(DragDropHelpers.DragDropFeedbackDataFormat))
{
dragDropFeedback = args.Data.GetData(DragDropHelpers.DragDropFeedbackDataFormat) as IDragDropFeedback;
}
else
{
var itemsControl = visual as System.Windows.Controls.ItemsControl;
var allowsRearrange = (itemsControl != null) && DragDropRearrangeBehavior.GetAllowsDragDropRearrange(itemsControl);
if (allowsRearrange)
{
dragDropFeedback = new DragDropFeedback();
args.Data.SetData(DragDropHelpers.DragDropFeedbackDataFormat, dragDropFeedback);
}
}
if (dragDropFeedback != null)
{
var height = visual.ActualHeight;
var location = args.GetPosition(visual);
var dropLocation = GetDropLocation(visual, location);
dragDropFeedback.DropLocation = dropLocation;
}
GetDragOverCommand(visual).Execute(args);
if (dragDropFeedback != null)
{
if (args.Effects == DragDropEffects.None)
{
dragDropFeedback.DropLocation = DropOnItemLocation.None;
}
DropItemLocationAdorner.Update(visual, dragDropFeedback, false);
}
args.Handled = true;
}
