private void DropTarget_PreviewDrop(object sender, DragEventArgs e)
{
object draggedItem = e.Data.GetData(this.format.Name);
int indexRemoved = -1;
if (draggedItem != null)
{
OutlinerNote note = draggedItem as OutlinerNote;
if (note == null)
{
RemoveInsertionAdorner();
RemoveDragOverMargin();
return;
}
UndoDragDrop undo = new UndoDragDrop(note);
indexRemoved = note.Parent.SubNotes.IndexOf(note);
note.Parent.SubNotes.Remove(note);
// This happens when we drag an item to a later position within the same ItemsControl.
if (indexRemoved != -1 &&
this.sourceItemContainer.ParentItemsControl == this.targetItemContainer && indexRemoved < this.insertionIndex)
{
this.insertionIndex--;
}
DranDropUtilities.InsertItemInItemsControl(this.targetItemContainer, draggedItem as OutlinerNote, this.insertionIndex);
note.Document.UndoManager.PushUndoAction(undo);
RemoveInsertionAdorner();
RemoveDragOverMargin();
}
e.Handled = true;
}
// Drag = mouse down + move by a certain amount
private void DragSource_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (this.draggedData != null)
{
// Only drag when user moved the mouse by a reasonable amount.
if (DranDropUtilities.IsMovementBigEnough(this.initialMousePosition, e.GetPosition(this.topWindow)))
{
DataObject data = new DataObject(this.format.Name, this.draggedData);
// Adding events to the window to make sure dragged adorner comes up when mouse is not over a drop target.
bool previousAllowDrop = this.topWindow.AllowDrop;
this.topWindow.AllowDrop = true;
this.topWindow.DragEnter += TopWindow_DragEnter;
this.topWindow.DragOver += TopWindow_DragOver;
this.topWindow.DragLeave += TopWindow_DragLeave;
DragDropEffects effects = DragDrop.DoDragDrop((DependencyObject)sender, data, DragDropEffects.Move);
// Without this call, there would be a bug in the following scenario: Click on a data item, and drag
// the mouse very fast outside of the window. When doing this really fast, for some reason I don't get
// the Window leave event, and the dragged adorner is left behind.
// With this call, the dragged adorner will disappear when we release the mouse outside of the window,
// which is when the DoDragDrop synchronous method returns.
//RemoveDraggedAdorner();
//RemoveInsertionAdorner();
this.topWindow.AllowDrop = previousAllowDrop;
this.topWindow.DragEnter -= TopWindow_DragEnter;
this.topWindow.DragOver -= TopWindow_DragOver;
this.topWindow.DragLeave -= TopWindow_DragLeave;
this.draggedData = null;
}
}
}
private void DragSource_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
this.sourceItemsControl = (ItemsControl)sender;
TreeListView tlv = (TreeListView)this.sourceItemsControl;
this.topWindow = (Window)DranDropUtilities.FindAncestor(typeof(Window), this.sourceItemsControl);
this.initialMousePosition = e.GetPosition(this.topWindow);
Visual visual = e.OriginalSource as Visual;
this.sourceItemContainer = DranDropUtilities.GetItemContainer(this.sourceItemsControl, visual);
if (this.sourceItemContainer != null)
{
this.draggedData = sourceItemContainer.DataContext;
}
}
private void DecideDropTarget(DragEventArgs e)
{
int targetItemsControlCount = this.targetItemsControl.Items.Count;
object draggedItem = e.Data.GetData(this.format.Name);
Visual visual = e.OriginalSource as Visual;
targetOverItem = DranDropUtilities.FindAncestor(typeof(TreeListViewItem), visual) as TreeListViewItem;
if (targetOverItem == null)
{
this.targetItemContainer = null;
this.insertionIndex = -1;
e.Effects = DragDropEffects.None;
return;
}
bool newDragOverNote = false;
OutlinerNote dragOverNote = null;
if (targetOverItem != null)
{
dragOverNote = targetOverItem.DataContext as OutlinerNote;
if (dragOverNote != null)
{
if (__DragOverNote != dragOverNote)
{
if (__DragOverNote != null)
{
__DragOverNote.DragOverNote = false;
}
newDragOverNote = true;
}
}
}
ItemsControl parentItemsControl = targetOverItem.ParentItemsControl;
if (parentItemsControl == null)
{
this.targetItemContainer = null;
this.insertionIndex = -1;
e.Effects = DragDropEffects.None;
return;
}
if (targetItemsControlCount > 0)
{
this.hasVerticalOrientation = DranDropUtilities.HasVerticalOrientation(this.targetItemsControl.ItemContainerGenerator.ContainerFromIndex(0) as FrameworkElement);
this.targetItemContainer = parentItemsControl;
this.insertionIndex = parentItemsControl.ItemContainerGenerator.IndexFromContainer(targetOverItem);
if (this.insertionIndex == -1)
{
this.targetItemContainer = null;
this.insertionIndex = -1;
e.Effects = DragDropEffects.None;
return;
}
if (IsParent(this.targetItemContainer as TreeListViewItem, this.sourceItemContainer))
{
this.targetItemContainer = null;
this.insertionIndex = -1;
e.Effects = DragDropEffects.None;
return;
}
if (newDragOverNote && dragOverNote != null)
{
dragOverNote.DragOverNote = true;
__DragOverNote = dragOverNote;
}
}
else
{
this.targetItemContainer = null;
this.insertionIndex = 0;
}
}
// DragSource
public static MainWindow GetMainWindow(Visual visual)
{
return(DranDropUtilities.FindAncestor(typeof(Window), visual) as MainWindow);
}