private static void OnOnDropCommandChanged( DependencyObject d, DependencyPropertyChangedEventArgs e )
{
var attached = DragDropManager.GetIsDropTargetAttached( d );
if( !attached )
{
DragDropManager.SetIsDropTargetAttached( d, true );
var ui = ( UIElement )d;
ui.AllowDrop = true;
var ctrl = ui as Control;
if( ctrl != null )
{
var bkg = ctrl.GetValue( ItemsControl.BackgroundProperty );
if( bkg == null )
{
ctrl.SetValue( ItemsControl.BackgroundProperty, Brushes.Transparent );
}
}
ui.DragEnter += ( s, args ) =>
{
var os = ( DependencyObject )args.OriginalSource;
var command = DragDropManager.FindDragEnterCommand( os );
if( command != null )
{
var dropTarget = DragDropManager.FindDropTarget( os );
var cmdArgs = new DragEnterArgs(
args.Data,
args.KeyStates,
dropTarget,
args.AllowedEffects );
if( command.CanExecute( cmdArgs ) )
{
command.Execute( cmdArgs );
}
}
};
ui.DragLeave += ( s, args ) =>
{
var os = ( DependencyObject )args.OriginalSource;
var command = DragDropManager.FindDragLeaveCommand( os );
if( command != null )
{
var dropTarget = DragDropManager.FindDropTarget( os );
var cmdArgs = new DragLeaveArgs(
args.Data,
args.KeyStates,
dropTarget,
args.AllowedEffects );
if( command.CanExecute( cmdArgs ) )
{
command.Execute( cmdArgs );
}
}
};
ui.DragOver += ( s, args ) =>
{
var os = ( DependencyObject )args.OriginalSource;
var command = DragDropManager.FindDropCommand( os );
if( command != null )
{
var dropTarget = DragDropManager.FindDropTarget( os );
Point position = new Point( 0, 0 );
if( os is IInputElement )
{
position = args.GetPosition( ( IInputElement )os );
}
var cmdArgs = new DragOverArgs(
args.Data,
args.KeyStates,
dropTarget,
args.AllowedEffects,
position );
var result = command.CanExecute( cmdArgs );
if( !result )
{
args.Effects = cmdArgs.Effects;
args.Handled = true;
}
}
else
{
args.Effects = args.AllowedEffects;
args.Handled = true;
}
};
ui.Drop += ( s, args ) =>
{
var os = ( DependencyObject )args.OriginalSource;
var command = DragDropManager.FindDropCommand( os );
if( command != null )
{
var dropTarget = DragDropManager.FindDropTarget( os );
Point position = new Point( 0, 0 );
if( os is IInputElement )
{
position = args.GetPosition( ( IInputElement )os );
}
var cmdArgs = new DropArgs( args.Data, args.KeyStates, dropTarget, position );
command.Execute( cmdArgs );
}
};
}
}
private static void OnOnDropCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var attached = DragDropManager.GetIsDropTargetAttached(d);
if (!attached)
{
DragDropManager.SetIsDropTargetAttached(d, true);
var ui = ( UIElement )d;
ui.AllowDrop = true;
var ctrl = ui as Control;
if (ctrl != null)
{
var bkg = ctrl.GetValue(ItemsControl.BackgroundProperty);
if (bkg == null)
{
ctrl.SetValue(ItemsControl.BackgroundProperty, Brushes.Transparent);
}
}
ui.DragEnter += (s, args) =>
{
var os = ( DependencyObject )args.OriginalSource;
var command = DragDropManager.FindDragEnterCommand(os);
if (command != null)
{
var dropTarget = DragDropManager.FindDropTarget(os);
var cmdArgs = new DragEnterArgs(
args.Data,
args.KeyStates,
dropTarget,
args.AllowedEffects);
if (command.CanExecute(cmdArgs))
{
command.Execute(cmdArgs);
}
}
};
ui.DragLeave += (s, args) =>
{
var os = ( DependencyObject )args.OriginalSource;
var command = DragDropManager.FindDragLeaveCommand(os);
if (command != null)
{
var dropTarget = DragDropManager.FindDropTarget(os);
var cmdArgs = new DragLeaveArgs(
args.Data,
args.KeyStates,
dropTarget,
args.AllowedEffects);
if (command.CanExecute(cmdArgs))
{
command.Execute(cmdArgs);
}
}
};
ui.DragOver += (s, args) =>
{
var os = ( DependencyObject )args.OriginalSource;
var command = DragDropManager.FindDropCommand(os);
if (command != null)
{
var dropTarget = DragDropManager.FindDropTarget(os);
Point position = new Point(0, 0);
if (os is IInputElement)
{
position = args.GetPosition(( IInputElement )os);
}
var cmdArgs = new DragOverArgs(
args.Data,
args.KeyStates,
dropTarget,
args.AllowedEffects,
position);
var result = command.CanExecute(cmdArgs);
if (!result)
{
args.Effects = cmdArgs.Effects;
args.Handled = true;
}
}
else
{
args.Effects = args.AllowedEffects;
args.Handled = true;
}
};
ui.Drop += (s, args) =>
{
var os = ( DependencyObject )args.OriginalSource;
var command = DragDropManager.FindDropCommand(os);
if (command != null)
{
var dropTarget = DragDropManager.FindDropTarget(os);
Point position = new Point(0, 0);
if (os is IInputElement)
{
position = args.GetPosition(( IInputElement )os);
}
var cmdArgs = new DropArgs(args.Data, args.KeyStates, dropTarget, position);
command.Execute(cmdArgs);
}
};
}
}
