private void StartDrag(ListBoxItem listBoxItem, MouseEventArgs e)
{
isDragging = true;
try
{
if (listBoxItem != null)
{
// Find the data behind the ListBoxItem
ICharacterOption option = (ICharacterOption)listBoxItem.DataContext;
int sourceIndex = optionListBox.Items.IndexOf(option);
// Initialize the drag & drop operation
DataObject dragData = new DataObject(Constants.OPTION_DRAG_KEY, new Tuple <IOptionGroupViewModel, int, ICharacterOption>(this.viewModel, sourceIndex, option));
DragDrop.DoDragDrop(listBoxItem, dragData, DragDropEffects.Move);
}
}
catch (Exception ex)
{
}
finally
{
isDragging = false;
dataItem = null;
}
}
private void RemoveOption(ICharacterOption option)
{
T optionToRemove = (T)option;
if (optionGroup.Contains(optionToRemove))
{
optionGroup.Remove(optionToRemove);
}
}
public static object GetCurrentSelectedOptionInOptionGroup(Object lb)
{
ICharacterOption option = null;
ListBox listBox = lb as ListBox;
if (listBox != null && listBox.SelectedItem != null)
{
if (listBox.SelectedItem is ICharacterOption)
{
option = listBox.SelectedItem as ICharacterOption;
}
}
return(option);
}
public void InsertOption(int index, ICharacterOption characterOption)
{
OptionGroup <T> group = (optionGroup as OptionGroup <T>);
var existingIndex = group.IndexOf((T)characterOption);
if (existingIndex >= 0)
{
group.RemoveAt(existingIndex);
if (index > 0 && index >= group.Count)
{
index -= 1;
}
}
group.Insert(index, (T)characterOption);
}
private void GroupBox_PreviewDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(Constants.OPTION_DRAG_KEY))
{
expanderExpandedForDrop = false;
GroupBox groupBox = (GroupBox)sender;
Tuple <IOptionGroupViewModel, int, ICharacterOption> dragDropDataTuple = e.Data.GetData(Constants.OPTION_DRAG_KEY) as Tuple <IOptionGroupViewModel, int, ICharacterOption>;
if (dragDropDataTuple != null)
{
IOptionGroupViewModel sourceViewModel = dragDropDataTuple.Item1;
int sourceIndex = dragDropDataTuple.Item2;
ICharacterOption option = dragDropDataTuple.Item3;
if (this.viewModel.OptionGroup.Type == OptionType.Mixed && sourceViewModel.OptionGroup.Type != OptionType.Mixed) // do a copy paste
{
sourceIndex = -1;
}
int targetIndex = 0;
ListBoxItem listBoxItem;
FindDropTarget(groupBox, out listBoxItem, e);
if (listBoxItem != null)
{
ICharacterOption target = listBoxItem.DataContext as ICharacterOption;
if (dragDropDataTuple != null && target != null)
{
targetIndex = optionListBox.Items.IndexOf(target);
}
}
else
{
targetIndex = optionListBox.Items != null ? optionListBox.Items.Count : 0; // append to last of current option group
if (sourceIndex >= 0 && this.viewModel == sourceViewModel) // an item will be removed from the current option group, so reduce target index by 1
{
targetIndex -= 1;
}
}
if (sourceViewModel != null && sourceIndex >= 0)
{
sourceViewModel.RemoveOption(sourceIndex);
}
this.viewModel.InsertOption(targetIndex, option);
this.viewModel.SaveOptionGroup();
}
}
}
