/// <summary>
/// First determine whether the drag data is supported.
/// Second determine what operation to do (copy, move, link).
/// And finally handle the actual drop when <code>bDrop</code> is true.
/// </summary>
/// <param name="bDrop">True to perform an actual drop, otherwise just return e.Effects</param>
/// <param name="sender">DragDrop event <code>sender</code></param>
/// <param name="e">DragDrop event arguments</param>
private void DragOverOrDrop(bool bDrop, object sender, DragEventArgs e)
{
CanvasDataProvider <TContainer, TObject> dataProvider = this.GetData(e) as CanvasDataProvider <TContainer, TObject>;
if (dataProvider != null)
{
TObject dragSourceObject = dataProvider.SourceObject as TObject;
Debug.Assert(dragSourceObject != null);
TContainer dropContainer = sender as TContainer;
if (dropContainer != null)
{
if (bDrop)
{
dataProvider.Unparent();
dropContainer.Children.Add(dragSourceObject);
Point dropPosition = e.GetPosition(dropContainer);
Point objectOrigin = dataProvider.StartPosition;
Canvas.SetLeft(dragSourceObject, dropPosition.X - objectOrigin.X);
Canvas.SetTop(dragSourceObject, dropPosition.Y - objectOrigin.Y);
}
e.Effects = DragDropEffects.Move;
e.Handled = true;
}
else
{
e.Effects = DragDropEffects.None;
e.Handled = true;
}
}
}
/// <summary>
/// First determine whether the drag data is supported.
/// Second determine what operation to do (move, link).
/// And finally handle the actual drop when <code>bDrop</code> is true.
///
/// Note that a new button needs to be created for the toolbar.
/// </summary>
/// <param name="bDrop">True to perform an actual drop, otherwise just return e.Effects</param>
/// <param name="sender">DragDrop event <code>sender</code></param>
/// <param name="e">DragDrop event arguments</param>
private void DragOverOrDrop(bool bDrop, object sender, DragEventArgs e)
{
CanvasDataProvider <TContainer, TObject> dataProvider = this.GetData(e) as CanvasDataProvider <TContainer, TObject>;
if (dataProvider != null)
{
TContainer dragSourceContainer = dataProvider.SourceContainer as TContainer;
TObject dragSourceObject = dataProvider.SourceObject as TObject;
Debug.Assert(dragSourceObject != null);
Debug.Assert(dragSourceContainer != null);
ItemsControl dropContainer = sender as ItemsControl;
TObject dropTarget = e.Source as TObject;
if (dropTarget == null)
{
dropTarget = DragDropFramework.Utilities.FindParentControlExcludingMe <TObject>(e.Source as DependencyObject);
}
if (dropContainer != null)
{
if (bDrop)
{
dataProvider.Unparent();
Button button;
#if REUSE_SAME_BUTTON //|| true
button = dragSourceObject as Button;
#else
Button oldButton = dragSourceObject as Button;
button = new Button();
button.Content = DragDropFramework.Utilities.CloneElement(oldButton.Content);
button.ToolTip = oldButton.ToolTip;
#endif
if (dropTarget == null)
{
dropContainer.Items.Add(button);
}
else
{
dropContainer.Items.Insert(dropContainer.Items.IndexOf(dropTarget), button);
}
}
e.Effects = (dropTarget == null) ? DragDropEffects.Move : DragDropEffects.Link;
e.Handled = true;
}
else
{
e.Effects = DragDropEffects.None;
e.Handled = true;
}
}
}