bool IDropTarget.CanDropElement(UIElement draggedElement)
{
bool canDrop = false;
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell == null)
{
return(false);
}
ColumnReorderingDragSourceManager manager =
draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
ColumnManagerCell cell = draggedElement as ColumnManagerCell;
if ((cell != null) &&
(cell.IsBeingDragged))
{
DataGridContext rowDataGridContext = DataGridControl.GetDataGridContext(this);
if ((rowDataGridContext != null) &&
(rowDataGridContext.Columns.Contains(cell.ParentColumn)))
{
canDrop = true;
}
}
}
return(canDrop);
}
internal void ProcessDrop(ColumnManagerCell draggedCell)
{
ColumnReorderingDragSourceManager manager = null;
if (draggedCell != null)
{
manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
}
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
manager.CommitReordering();
}
else
{
int oldPosition = draggedCell.ParentColumn.VisiblePosition;
int newPosition = this.ParentColumn.VisiblePosition;
if (m_dropMarkAdorner != null)
{
DropMarkAlignment alignment = m_dropMarkAdorner.Alignment;
this.HideDropMark();
if (draggedCell.ParentColumn.VisiblePosition < newPosition)
{
if (alignment == DropMarkAlignment.Near)
{
draggedCell.ParentColumn.VisiblePosition = newPosition - 1;
}
else
{
draggedCell.ParentColumn.VisiblePosition = newPosition;
}
}
else
{
if (alignment == DropMarkAlignment.Near)
{
draggedCell.ParentColumn.VisiblePosition = newPosition;
}
else
{
draggedCell.ParentColumn.VisiblePosition = newPosition + 1;
}
}
// This will force every Rows to update there layout
ColumnReorderingEventArgs e = new ColumnReorderingEventArgs(ColumnManagerCell.ColumnReorderingEvent, oldPosition, newPosition);
this.RaiseEvent(e);
}
}
}
void IDropTarget.Drop(UIElement draggedElement)
{
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell == null)
{
return;
}
ColumnReorderingDragSourceManager manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
manager.CommitReordering();
}
}
void IDropTarget.DragLeave(UIElement draggedElement)
{
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell != null)
{
ColumnReorderingDragSourceManager manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
// No need for drop mark when performing animated Column reordering
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
return;
}
}
this.HideDropMark();
}
void IDropTarget.DragOver(UIElement draggedElement, Point mousePosition)
{
ColumnManagerCell draggedCell = draggedElement as ColumnManagerCell;
if (draggedCell != null)
{
ColumnReorderingDragSourceManager manager = draggedCell.DragSourceManager as ColumnReorderingDragSourceManager;
// No need for drop mark when performing animated Column reordering
if ((manager != null) && (manager.IsAnimatedColumnReorderingEnabled))
{
return;
}
}
this.ShowDropMark(mousePosition);
}
internal static void SetColumnReorderingDragSourceManager(DependencyObject obj, ColumnReorderingDragSourceManager value)
{
obj.SetValue(TableflowView.ColumnReorderingDragSourceManagerProperty, value);
}
private void SetupDragManager()
{
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
// 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;
}
}
// Can be null in design-time (edition of a style TargetType ColumnManagerCell).
if (dataGridContext == null)
{
return;
}
DataGridControl 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);
}
else
{
m_dragSourceManager = new ColumnReorderingDragSourceManager(this,
null,
dataGridControl);
}
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 SetupDragManager()
{
// Prevent any drag operation if columns layout is changing.
var dataGridContext = this.DataGridContext;
if ((dataGridContext == null) || (dataGridContext.ColumnManager.IsUpdateDeferred))
{
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;
Debug.Assert(dataGridControl != null);
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;
binding.Converter = new MillisecondsConverter();
BindingOperations.SetBinding(m_dragSourceManager, DragSourceManager.AutoScrollIntervalProperty, binding);
binding = new Binding();
binding.Path = new PropertyPath("(0).(1)", DataGridControl.DataGridContextProperty, TableView.AutoScrollThresholdProperty);
binding.Mode = BindingMode.OneWay;
binding.Source = this;
BindingOperations.SetBinding(m_dragSourceManager, DragSourceManager.AutoScrollThresholdProperty, binding);
}
