public void Drop(IDropInfo dropInfo)
{
ProgramToStart sourceItem = dropInfo.Data as ProgramToStart; //dragged item
ProgramToStart targetItem = dropInfo.TargetItem as ProgramToStart; //item on with user drops the sourceitem
RelativeInsertPosition positionOfItem = dropInfo.InsertPosition; //position (before or after targetItem)
int insertIndex = dropInfo.InsertIndex; //positon in ProgramsToStartList where item was dropped
//Checking if item was dropped before or after targetItem and moving into correct position in ProgramsToStartList
if (positionOfItem == (RelativeInsertPosition.BeforeTargetItem | RelativeInsertPosition.TargetItemCenter))
{
ProgramsToStartList.Move(sourceItem.StartingOrder - 1, insertIndex);
}
else
{
//Checking if new position is the last in the list - if it is last, put item in the last position
//To prevent ArgumentOutOfRange Exception for ProgramsToStartList.Move()
if (insertIndex == ProgramsToStartList.Count)
{
ProgramsToStartList.Move(sourceItem.StartingOrder - 1, insertIndex - 1);
}
else
{
ProgramsToStartList.Move(sourceItem.StartingOrder - 1, insertIndex);
}
}
//After source Item was moved to the new position we need to update StartingOrder property of all ProgramsToStart
UpdateStartingOrdersInProgramsToStartListView();
//Then we need to refresh the ListView
RefreshProgramsToStartListView();
}
public void Drop(IDropInfo dropInfo)
{
ProgramToStartWrapper sourceItem = dropInfo.Data as ProgramToStartWrapper; //dragged item
ProgramToStartWrapper targetItem = dropInfo.TargetItem as ProgramToStartWrapper; //item on with user drops the sourceitem
RelativeInsertPosition positionOfItem = dropInfo.InsertPosition; //position (before or after targetItem)
int insertIndex = dropInfo.InsertIndex; //positon in ProgramsToStart where item was dropped
if (positionOfItem == RelativeInsertPosition.BeforeTargetItem || targetItem.Order >= HandlersManager.StartingProgramsHandler.ProgramsToStart.Count)
{
HandlersManager.StartingProgramsHandler.TryChangeProgramToStartIndex(sourceItem.Order, targetItem.Order);
}
else
{
HandlersManager.StartingProgramsHandler.TryChangeProgramToStartIndex(sourceItem.Order, targetItem.Order + 1);
}
}
private static void OnListDragOver(object?sender, DragEventArgs e)
{
var listBox = sender as ListBox;
var dropElement = FindVisualParent <ListBoxItem>(e.Source as IVisual);
var dragInfo = e.Data.Get("") as DragInfo?;
if (dragInfo == null || dragInfo.Value.draggedElement.Count == 0)
{
return;
}
if (listBox == null)
{
return;
}
var dropHandler = GetDropHandler(listBox);
if (dropHandler == null)
{
return;
}
var indexOfDrop = listBox.ItemContainerGenerator.IndexFromContainer(dropElement);
RelativeInsertPosition insertPosition = RelativeInsertPosition.None;
if (dropElement != null)
{
var rel = e.GetPosition(dropElement).Y / dropElement.Bounds.Height;
if (rel < 0.5f)
{
insertPosition = RelativeInsertPosition.BeforeTargetItem;
}
else
{
insertPosition = RelativeInsertPosition.AfterTargetItem;
}
if (rel >= 0.25f && rel <= 0.75f)
{
insertPosition |= RelativeInsertPosition.TargetItemCenter;
}
}
else
{
indexOfDrop = listBox.ItemCount;
}
var dropInfo = new DropInfo(dragInfo.Value.draggedElement[0] !)
{
InsertIndex = indexOfDrop,
InsertPosition = insertPosition,
TargetItem = listBox.Items
};
dropHandler.DragOver(dropInfo);
{
double mousePosY = e.GetPosition(listBox).Y;
if (mousePosY < 10)
{
listBox.Scroll.Offset = listBox.Scroll.Offset + new Vector(0, -1);
}
else if (mousePosY > listBox.Bounds.Height - 10)
{
listBox.Scroll.Offset = listBox.Scroll.Offset + new Vector(0, +1);
}
}
adorner.Adorner?.Update(listBox, dropInfo);
}
