// Handles the Drop event for both ListViews.
void OnListViewDrop(object sender, DragEventArgs e)
{
if (e.Effects == DragDropEffects.None)
{
return;
}
DragDropTestChoreObject task = e.Data.GetData(typeof(DragDropTestChoreObject)) as DragDropTestChoreObject;
if (sender == this.listView1)
{
if (this.dragMgr1.IsDragInProgress)
{
return;
}
// An item was dragged from the bottom ListView into the top ListView
// so remove that item from the bottom ListView.
(this.listView2.ItemsSource as ObservableCollection <DragDropTestChoreObject>).Remove(task);
}
else
{
if (this.dragMgr2.IsDragInProgress)
{
return;
}
// An item was dragged from the top ListView into the bottom ListView
// so remove that item from the top ListView.
(this.listView1.ItemsSource as ObservableCollection <DragDropTestChoreObject>).Remove(task);
}
}
void Window1_Loaded(object sender, RoutedEventArgs e)
{
// Give the ListView an ObservableCollection of Task
// as a data source. Note, the ListViewDragManager MUST
// be bound to an ObservableCollection, where the collection's
// type parameter matches the ListViewDragManager's type
// parameter (in this case, both have a type parameter of Task).
ObservableCollection <DragDropTestChoreObject> tasks = DragDropTestChoreObject.CreateTasks();
this.listView1.ItemsSource = tasks;
this.listView2.ItemsSource = new ObservableCollection <DragDropTestChoreObject>();
// This is all that you need to do, in order to use the ListViewDragManager.
this.dragMgr1 = new ListViewDragDropManager <DragDropTestChoreObject>(this.listView1);
this.dragMgr2 = new ListViewDragDropManager <DragDropTestChoreObject>(this.listView2);
// Turn the ListViewDragManager on and off.
this.chkManageDragging.Checked += delegate { this.dragMgr1.ListView = this.listView1; };
this.chkManageDragging.Unchecked += delegate { this.dragMgr1.ListView = null; };
// Show and hide the drag adorner.
this.chkDragAdorner.Checked += delegate { this.dragMgr1.ShowDragAdorner = true; };
this.chkDragAdorner.Unchecked += delegate { this.dragMgr1.ShowDragAdorner = false; };
// Change the opacity of the drag adorner.
this.sldDragOpacity.ValueChanged += delegate { this.dragMgr1.DragAdornerOpacity = this.sldDragOpacity.Value; };
// Apply or remove the item container style, which responds to changes
// in the attached properties of ListViewItemDragState.
this.chkApplyContStyle.Checked += delegate { this.listView1.ItemContainerStyle = this.FindResource("ItemContStyle") as Style; };
this.chkApplyContStyle.Unchecked += delegate { this.listView1.ItemContainerStyle = null; };
// Use or do not use custom drop logic.
this.chkSwapDroppedItem.Checked += delegate { this.dragMgr1.ProcessDrop += dragMgr_ProcessDrop; };
this.chkSwapDroppedItem.Unchecked += delegate { this.dragMgr1.ProcessDrop -= dragMgr_ProcessDrop; };
// Show or hide the lower ListView.
this.chkShowOtherListView.Checked += delegate { this.listView2.Visibility = Visibility.Visible; };
this.chkShowOtherListView.Unchecked += delegate { this.listView2.Visibility = Visibility.Collapsed; };
// Hook up events on both ListViews to that we can drag-drop
// items between them.
this.listView1.DragEnter += OnListViewDragEnter;
this.listView2.DragEnter += OnListViewDragEnter;
this.listView1.Drop += OnListViewDrop;
this.listView2.Drop += OnListViewDrop;
}