private void BeginDrag(MouseEventArgs e)
{
this.initialMousePosition = new Point(e.X, e.Y);
RadElement elementAtPoint = sourceComponentElementTree.GetElementAtPoint(this.initialMousePosition);
if (elementAtPoint == null)
{
return;
}
else
{
if ((elementAtPoint.Visibility != ElementVisibility.Visible))
{
return;
}
}
if (elementAtPoint is RadListElement)
{
return;
}
if (elementAtPoint is RadListVisualItem)
{
sourceListBox.SelectedItem = (elementAtPoint as RadListVisualItem).Data;
}
this.draggedItem = (elementAtPoint as RadListVisualItem).Data;
DragCancelEventArgs args = new DragCancelEventArgs(this.draggedItem, null);
if (args.Cancel)
{
this.draggedItem = null;
return;
}
RadDragEventArgs dragArgs = new RadDragEventArgs(this.draggedItem, null);
this.isRealDrag = false;
this.dragging = true;
if (this.feedBackForm == null)
{
feedBackForm = new FeedBackForm();
}
this.colorToSet = this.FeedbackFormLineColor();
this.feedBackForm.LineColor = this.colorToSet;
if (this.draggedItem != null)
{
PrepareDragging(e);
}
}
private void RefreshItemsAfterDragDrop(MouseEventArgs e)
{
if (this.draggedItem == this.replacedItem)
{
return;
}
DragCancelEventArgs args = new DragCancelEventArgs(this.draggedItem, this.replacedItem);
if (args.Cancel)
{
this.draggedItem = null;
this.replacedItem = null;
return;
}
if (replacedItem != null)
{
int replacedItemIndex = targetListBox.Items.IndexOf(this.replacedItem);
int draggedItemIndex = sourceListBox.Items.IndexOf(this.draggedItem);
int UpperBound = replacedItem.VisualItem.Bounds.Height * replacedItemIndex;
int MiddleBound = UpperBound + replacedItem.VisualItem.Bounds.Height / 2;
if (sourceListBox == targetListBox && draggedItemIndex == replacedItemIndex)
{
return;
}
sourceListBox.Items.RemoveAt(draggedItemIndex);
Point p1 = new Point();
p1.X = e.X;
p1.Y = e.Y;
if (p1.Y <= MiddleBound && p1.Y > UpperBound)
{
if (sourceListBox == targetListBox)
{
//the dragged item should be added above the replaced item
if (draggedItemIndex < replacedItemIndex)
{
targetListBox.Items.Insert(replacedItemIndex - 1, this.draggedItem);
}
else
{
targetListBox.Items.Insert(replacedItemIndex, this.draggedItem);
}
}
else
{
targetListBox.Items.Insert(replacedItemIndex, this.draggedItem);
}
}
else
{
if (sourceListBox == targetListBox)
{
//the dragged item should be added below the replaced item
if (draggedItemIndex > replacedItemIndex)
{
targetListBox.Items.Insert(replacedItemIndex + 1, this.draggedItem);
}
else
{
targetListBox.Items.Insert(replacedItemIndex, this.draggedItem);
}
//targetListBox.Items.Insert(replacedItemIndex, this.draggedItem);
}
else
{
targetListBox.Items.Insert(replacedItemIndex + 1, this.draggedItem);
}
}
}
else
{
int idx = sourceListBox.Items.IndexOf(this.draggedItem);
sourceListBox.Items.RemoveAt(idx);
targetListBox.SelectedItem = null;
targetListBox.Items.Add(this.draggedItem);
}
targetListBox.SelectedIndex = -1;
targetListBox.SelectedItem = draggedItem;
this.draggedItem = null;
this.replacedItem = null;
}