protected override void OnPreviewDragDrop(RadDropEventArgs e)
{
base.OnPreviewDragDrop(e);
if (e.Handled || this.owner.ListSource.IsDataBound)
{
return;
}
if ((this.owner.EnableGrouping || this.owner.EnableCustomGrouping) && this.owner.ShowGroups || (this.owner.EnableSorting || this.owner.ListSource.IsDataBound))
{
int num = (int)RadMessageBox.Show("DragDrop is not supported in grouped, sorted or data-bound mode. \nPlease handle the ListViewElement.DragDropService.PreviewDragDrop event manually \nand set e.Handled = true or just set the AllowDragDrop property to false to disable this message.", "Error", MessageBoxButtons.OK, RadMessageIcon.Error);
}
else
{
RadElement hitTarget1 = e.HitTarget as RadElement;
BaseListViewVisualItem listViewVisualItem = e.HitTarget as BaseListViewVisualItem;
BaseListViewElement hitTarget2 = e.HitTarget as BaseListViewElement;
if (hitTarget1 != null)
{
Point control = hitTarget1.PointToControl(e.DropLocation);
if (listViewVisualItem == null)
{
listViewVisualItem = this.owner.ViewElement.GetVisualItemAt(control);
}
}
if (listViewVisualItem != null && listViewVisualItem.Data.Owner != this.owner || hitTarget2 != null && hitTarget2.Owner != this.owner)
{
this.HandleDropBetweenListViews(e);
}
else
{
this.HandleDragDrop(e);
}
this.owner.InvalidateMeasure(true);
}
}
public SimpleListViewContainer(BaseListViewElement owner)
: base(owner)
{
}
protected virtual void HandleDragDrop(RadDropEventArgs e)
{
RadElement hitTarget1 = e.HitTarget as RadElement;
BaseListViewVisualItem targetElement = e.HitTarget as BaseListViewVisualItem;
BaseListViewElement hitTarget2 = e.HitTarget as BaseListViewElement;
if (hitTarget1 != null)
{
targetElement = this.owner.ViewElement.GetVisualItemAt(hitTarget1.PointToControl(e.DropLocation));
}
ListViewDataItem listViewDataItem = targetElement?.Data;
bool flag = false;
if (listViewDataItem != null)
{
listViewDataItem.Owner.ListSource.BeginUpdate();
if (this.owner.ViewElement.ShouldDropAfter(targetElement, e.DropLocation))
{
ITraverser <ListViewDataItem> enumerator = this.owner.ViewElement.Scroller.Traverser.GetEnumerator() as ITraverser <ListViewDataItem>;
enumerator.Position = (object)listViewDataItem;
flag = !enumerator.MoveNext();
listViewDataItem = enumerator.Current;
}
int newIndex = this.owner.ListSource.IndexOf(listViewDataItem);
if (this.draggedItems != null)
{
foreach (ListViewDataItem draggedItem in this.draggedItems)
{
int oldIndex = this.owner.ListSource.IndexOf(draggedItem);
this.owner.ListSource.Move(oldIndex, newIndex);
if (oldIndex > newIndex)
{
++newIndex;
}
}
}
else if (this.draggedItem != null)
{
int num1 = this.owner.ListSource.IndexOf(this.draggedItem);
if (flag)
{
int num2 = this.owner.ListSource.Count - 1;
}
else if (num1 < newIndex)
{
--newIndex;
}
this.owner.ListSource.Move(this.owner.ListSource.IndexOf(this.draggedItem), newIndex);
}
listViewDataItem.Owner.ListSource.EndUpdate();
listViewDataItem.Owner.ViewElement.Scroller.UpdateScrollValue();
}
else
{
if (hitTarget2 == null)
{
return;
}
hitTarget2.Owner.ListSource.BeginUpdate();
if (this.draggedItems != null)
{
foreach (ListViewDataItem draggedItem in this.draggedItems)
{
hitTarget2.Owner.ListSource.Move(this.owner.ListSource.IndexOf(draggedItem), this.owner.ListSource.Count - 1);
}
}
else if (this.draggedItem != null)
{
hitTarget2.Owner.ListSource.Move(this.owner.ListSource.IndexOf(this.draggedItem), this.owner.ListSource.Count - 1);
}
hitTarget2.Owner.ListSource.EndUpdate();
hitTarget2.Owner.ViewElement.Scroller.UpdateScrollValue();
}
}
protected virtual void HandleDropBetweenListViews(RadDropEventArgs e)
{
RadElement hitTarget = e.HitTarget as RadElement;
BaseListViewVisualItem listViewVisualItem = e.HitTarget as BaseListViewVisualItem;
BaseListViewElement baseListViewElement = e.HitTarget as BaseListViewElement;
if (listViewVisualItem != null && baseListViewElement == null)
{
baseListViewElement = listViewVisualItem.Data.Owner.ViewElement;
}
ListViewDataItem data;
if (hitTarget != null)
{
Point control = hitTarget.PointToControl(e.DropLocation);
if (listViewVisualItem == null)
{
listViewVisualItem = baseListViewElement.GetVisualItemAt(control);
}
data = listViewVisualItem?.Data;
}
else
{
data = listViewVisualItem?.Data;
}
if (data != null)
{
data.Owner.ListSource.BeginUpdate();
int index = data.Owner.ListSource.IndexOf(data);
if (e.DropLocation.Y > listViewVisualItem.Size.Height / 2)
{
++index;
}
if (this.draggedItems != null)
{
foreach (ListViewDataItem draggedItem in this.draggedItems)
{
this.owner.ListSource.Remove(draggedItem);
data.Owner.ListSource.Insert(index, draggedItem);
++index;
}
}
else if (this.draggedItem != null)
{
this.owner.ListSource.Remove(this.draggedItem);
data.Owner.ListSource.Insert(index, this.draggedItem);
}
data.Owner.ListSource.EndUpdate();
data.Owner.ViewElement.Scroller.UpdateScrollValue();
}
else
{
if (baseListViewElement == null)
{
return;
}
baseListViewElement.Owner.ListSource.BeginUpdate();
if (this.draggedItems != null)
{
foreach (ListViewDataItem draggedItem in this.draggedItems)
{
this.owner.ListSource.Remove(draggedItem);
baseListViewElement.Owner.ListSource.Add(draggedItem);
}
}
else if (this.draggedItem != null)
{
this.owner.ListSource.Remove(this.draggedItem);
baseListViewElement.Owner.ListSource.Add(this.draggedItem);
}
baseListViewElement.Owner.ListSource.EndUpdate();
baseListViewElement.Owner.ViewElement.Scroller.UpdateScrollValue();
}
}
public DetailsListViewContainer(BaseListViewElement owner)
: base(owner)
{
}
public IconListViewContainer(BaseListViewElement owner) : base(owner)
{
}
public ListViewVirtualizedElementProvider(BaseListViewElement owner)
{
this.owner = owner;
}
public BaseListViewContainer(BaseListViewElement owner)
{
this.owner = owner;
}