internal static void SetColumnReorderingDragSourceManager( DependencyObject obj, ColumnReorderingDragSourceManager value )
{
obj.SetValue( TableflowView.ColumnReorderingDragSourceManagerProperty, value );
}
private void SetupDragManager()
{
var dataGridContext = this.DataGridContext;
// Can be null in design-time (edition of a style TargetType ColumnManagerCell).
if( dataGridContext == null )
return;
// We do not support DragDrop when there are no AdornerLayer because there wouldn't be any visual feedback for the operation.
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer( this );
if( adornerLayer == null )
{
// When virtualizing, the Cell is not yet in the VisualTree because it is the ParentRow's CellsHost which
// is reponsible of putting them in the VisualTree. We try to get the adorner from the ParentRow instead
if( this.ParentRow != null )
{
adornerLayer = AdornerLayer.GetAdornerLayer( this.ParentRow );
}
if( adornerLayer == null )
return;
}
var dataGridControl = dataGridContext.DataGridControl;
if( dataGridControl == null )
return;
if( m_dragSourceManager != null )
{
m_dragSourceManager.PropertyChanged -= this.DragSourceManager_PropertyChanged;
}
// The DataGridControl's AdornerDecoratorForDragAndDrop must be used for dragging in order to include the RenderTransform
// the DataGridControl may performs. This AdornerDecorator is defined in the ControlTemplate as PART_DragDropAdornerDecorator
if( ( dataGridControl.DragDropAdornerDecorator != null ) && ( dataGridControl.DragDropAdornerDecorator.AdornerLayer != null ) )
{
m_dragSourceManager = new ColumnReorderingDragSourceManager( this, dataGridControl.DragDropAdornerDecorator.AdornerLayer, dataGridControl, this.ParentRow.LevelCache );
}
else
{
m_dragSourceManager = new ColumnReorderingDragSourceManager( this, null, dataGridControl, this.ParentRow.LevelCache );
}
m_dragSourceManager.PropertyChanged += this.DragSourceManager_PropertyChanged;
// Create bindings to ViewProperties for AutoScroll Properties
Binding binding = new Binding();
binding.Path = new PropertyPath( "(0).(1)", DataGridControl.DataGridContextProperty, TableView.AutoScrollIntervalProperty );
binding.Mode = BindingMode.OneWay;
binding.Source = this;
BindingOperations.SetBinding( m_dragSourceManager, DragSourceManager.AutoScrollIntervalProperty, binding );
binding = new Binding();
binding.Path = new PropertyPath( "(0).(1)", DataGridControl.DataGridContextProperty, TableView.AutoScrollTresholdProperty );
binding.Mode = BindingMode.OneWay;
binding.Source = this;
BindingOperations.SetBinding( m_dragSourceManager, DragSourceManager.AutoScrollTresholdProperty, binding );
}
private void RemoveDraggedColumnGhost( ColumnReorderingDragSourceManager manager )
{
if( !manager.ContainsDraggedColumnGhost( this ) )
return;
manager.RemoveDraggedColumnGhost( this );
this.ClearValue( Cell.OpacityProperty );
}
internal virtual void SetColumnReorderingDragSourceManager( ColumnReorderingDragSourceManager value )
{
TableflowView.SetColumnReorderingDragSourceManager( this, value );
}
private void AddDraggedColumnGhost( ColumnReorderingDragSourceManager manager, bool isBeingDraggedAnimated )
{
if( !isBeingDraggedAnimated || !this.IsContainerPrepared || manager.ContainsDraggedColumnGhost( this ) )
return;
this.ClearValue( Cell.OpacityProperty );
manager.AddDraggedColumnGhost( this );
}