protected internal virtual void OnColumnReordering(DataGridColumnReorderingEventArgs e)
{
EventHandler<DataGridColumnReorderingEventArgs> handler = this.ColumnReordering;
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// Method which start the column header drag. Includes raising events and creating default ghosts
/// </summary>
private void StartColumnHeaderDrag()
{
Debug.Assert(ParentDataGrid != null, "ParentDataGrid is null");
_columnHeaderDragStartPosition = _columnHeaderDragCurrentPosition;
DragStartedEventArgs dragStartedEventArgs = new DragStartedEventArgs(_columnHeaderDragStartPosition.X, _columnHeaderDragStartPosition.Y);
ParentDataGrid.OnColumnHeaderDragStarted(dragStartedEventArgs);
DataGridColumnReorderingEventArgs reorderingEventArgs = new DataGridColumnReorderingEventArgs(_draggingSrcColumnHeader.Column);
_columnHeaderDragIndicator = CreateColumnHeaderDragIndicator();
_columnHeaderDropLocationIndicator = CreateColumnHeaderDropIndicator();
reorderingEventArgs.DragIndicator = _columnHeaderDragIndicator;
reorderingEventArgs.DropLocationIndicator = _columnHeaderDropLocationIndicator;
ParentDataGrid.OnColumnReordering(reorderingEventArgs);
if (!reorderingEventArgs.Cancel)
{
_isColumnHeaderDragging = true;
_columnHeaderDragIndicator = reorderingEventArgs.DragIndicator;
_columnHeaderDropLocationIndicator = reorderingEventArgs.DropLocationIndicator;
if (_columnHeaderDragIndicator != null)
{
SetDefaultsOnDragIndicator();
AddVisualChild(_columnHeaderDragIndicator);
}
if (_columnHeaderDropLocationIndicator != null)
{
SetDefaultsOnDropIndicator();
AddVisualChild(_columnHeaderDropLocationIndicator);
}
_draggingSrcColumnHeader.SuppressClickEvent = true;
InvalidateMeasure();
}
else
{
FinishColumnHeaderDrag(true);
}
}
protected internal virtual void OnColumnReordering(DataGridColumnReorderingEventArgs e)
{
if (ColumnReordering != null)
{
ColumnReordering(this, e);
}
}
private void fltdg_ColumnReordering(object sender, DataGridColumnReorderingEventArgs e)
{
selectedReorderingColumnIndex = e.Column.DisplayIndex;
}
private void OnMouseMove_BeginReorder(Point mousePosition, Point mousePositionGridParent)
{
DataGridColumnHeader dragIndicator = new DataGridColumnHeader();
dragIndicator.OwningColumn = this.OwningColumn;
dragIndicator.IsEnabled = false;
dragIndicator.Content = this.Content;
dragIndicator.ContentTemplate = this.ContentTemplate;
if (this.OwningColumn.DragIndicatorStyle != null)
{
dragIndicator.SetStyleWithType(this.OwningColumn.DragIndicatorStyle);
}
else if (this.OwningGrid.DragIndicatorStyle != null)
{
dragIndicator.SetStyleWithType(this.OwningGrid.DragIndicatorStyle);
}
// If the user didn't style the dragIndicator's Width, default it to the column header's width
if (double.IsNaN(dragIndicator.Width))
{
dragIndicator.Width = this.ActualWidth;
}
// If the user didn't style the dropLocationIndicator's Height, default to the column header's height
if (double.IsNaN(this.OwningGrid.ColumnDropLocationIndicator.Height))
{
this._autoSizeDropLocationIndicatorHeight = true;
this.OwningGrid.ColumnDropLocationIndicator.Height = this.ActualHeight;
}
// pass the caret's data template to the user for modification
DataGridColumnReorderingEventArgs columnReorderingEventArgs = new DataGridColumnReorderingEventArgs(this.OwningColumn)
{
DropLocationIndicator = this.OwningGrid.ColumnDropLocationIndicator,
DragIndicator = dragIndicator
};
this.OwningGrid.OnColumnReordering(columnReorderingEventArgs);
if (columnReorderingEventArgs.Cancel)
{
return;
}
// The user didn't cancel, so prepare for the reorder
_dragColumn = this.OwningColumn;
_dragMode = DragMode.Reorder;
_dragStartParent = mousePositionGridParent;
// the mouse position relative to the ColumnHeader needs to be scaled to be in the same
// dimensions as the DataGrid, so that it doesn't get out of sync later on
_dragStart = this.OwningGrid.RenderTransform.Transform(mousePosition);
// Display the reordering thumb
if (_reorderingThumb == null)
{
_reorderingThumb = new Popup();
}
_reorderingThumb.Child = columnReorderingEventArgs.DragIndicator;
_reorderingThumb.IsOpen = true;
// use the data template to populate the caret
if (columnReorderingEventArgs.DropLocationIndicator != null)
{
System.Windows.Controls.Control child = columnReorderingEventArgs.DropLocationIndicator;
this.OwningGrid.ColumnDropLocationIndicatorPopup.Child = child;
this.OwningGrid.ColumnDropLocationIndicatorPopup.Height = child.ActualHeight;
this.OwningGrid.ColumnDropLocationIndicatorPopup.Width = child.ActualWidth;
this.OwningGrid.ColumnDropLocationIndicatorPopup.IsOpen = false;
}
}
protected internal virtual new void OnColumnReordering(DataGridColumnReorderingEventArgs e)
{
}
