private bool Unparent(DragDataWrapper dw, UIElement uie)
{
bool success = false;
if (dw != null)
{
if (dw.AllowChildrenRemove)
{
dw.Shim.UnParent();
}
}
if (!success) // BRUTE FORCE
{
if (uie is FrameworkElement)
{
FrameworkElement fe = uie as FrameworkElement;
if (fe.Parent != null)
{
if (fe.Parent is Panel)
{
try
{
((Panel)(fe.Parent)).Children.Remove(uie);
success = true;
}
catch (Exception)
{
#if DEBUG
System.Diagnostics.Debug.Assert(false);
#endif
}
}
}
else if (fe.Parent is ContentControl)
{
ContentControl cc = fe.Parent as ContentControl;
cc.Content = null;
success = true;
}
}
}
return(success);
}
private void DropTarget_Drop(object sender, DragEventArgs e)
{
IDataObject data = e.Data;
DragDataWrapper dw = null;
bool isDataOperation = false;
Debug.Assert(data != null);
if (data.GetDataPresent(typeof(DragDataWrapper).ToString()))
{
dw = data.GetData(typeof(DragDataWrapper).ToString()) as DragDataWrapper;
Debug.Assert(dw.Shim != null);
if ((dw.Shim.SupportedActions & DragDropProviderActions.Data) != 0)
{
isDataOperation = true;
}
}
// Try a BRUTE FORCE APPROACH on UIElement just to show how it could be done
// BUT NOT ENDORSING IT!!!
if (!isDataOperation)
{
if (this.dropTarget is Canvas)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
{
this.DropFileLink(e);
}
else if (e.Data.GetDataPresent(UrlDataFormat))
{
this.DropUrl(e);
}
}
}
else
{
Debug.Assert(dw != null);
Debug.Assert(dw.Shim != null);
object rawdata = dw.Data;
if (this.dropTarget is ItemsControl)
{
this.DropItemsControlHandler(e, rawdata);
}
else if (dropTarget is Canvas)
{
if (rawdata is IWidget)
{
this.DropCanvasWidget(e, rawdata as IWidget);
}
else if (rawdata is SiteMapNode)
{
this.DropCanvasInternalLink(e, rawdata as NavigationNode);
}
}
}
e.Handled = true;
}
private void StartDrag(MouseEventArgs args)
{
IDataObject data = null;
UIElement dragelement = null;
// ADD THE DATA
if (this.Callback != null)
{
DragDataWrapper dw = new DragDataWrapper();
data = new DataObject(typeof(DragDataWrapper).ToString(), dw);
if ((this.Callback.SupportedActions & DragDropProviderActions.MultiFormatData) != 0)
{
this.Callback.AppendData(ref data, args);
}
if ((this.Callback.SupportedActions & DragDropProviderActions.Data) != 0)
{
dw.Data = this.Callback.GetData();
}
if ((this.Callback.SupportedActions & DragDropProviderActions.Visual) != 0)
{
dragelement = this.Callback.GetVisual(args);
}
else
{
dragelement = args.OriginalSource as UIElement;
}
dw.Source = this.DragSource;
dw.Shim = this.Callback;
Debug.Assert(this.DragScope == null, "The DragDataWrapper is meant for in-proc... Sorry for asserting, just wanted to confirm.. comment out assertion if needed");
}
else
{
dragelement = args.OriginalSource as UIElement;
data = new DataObject(typeof(UIElement).ToString(), dragelement);
}
if (dragelement == null || data == null || dragelement == this.DragSource)
{
return;
}
DragEventHandler dragOver = null;
DragEventHandler dragLeave = null;
QueryContinueDragEventHandler queryContinue = null;
GiveFeedbackEventHandler giveFeedback = null;
DragDropEffects effects = this.GetDragDropEffects();
DragDropEffects resultEffects;
// Inprocess Drag ...
if (this.DragScope != null)
{
bool previousAllowDrop = this.DragScope.AllowDrop;
this.adorner = new DragAdorner(this.DragScope, (UIElement)dragelement, true, this.Opacity);
this.layer = AdornerLayer.GetAdornerLayer(this.DragScope as Visual);
this.layer.Add(this.adorner);
if (this.DragScope != this.DragSource)
{
this.DragScope.AllowDrop = true;
DragDrop.AddPreviewDragOverHandler((DependencyObject)this.DragScope, dragOver = new DragEventHandler(DragScope_DragOver));
DragDrop.AddPreviewDragLeaveHandler(this.DragScope, dragLeave = new DragEventHandler(DragScope_DragLeave));
DragDrop.AddPreviewQueryContinueDragHandler(this.DragSource, queryContinue = new QueryContinueDragEventHandler(OnQueryContinueDrag));
}
try
{
this.IsDragging = true;
this.mouseLeftScope = false;
resultEffects = DragDrop.DoDragDrop(this.DragSource, data, effects);
this.DragFinished(resultEffects);
}
catch
{
Debug.Assert(false);
}
if (this.DragScope != this.DragSource)
{
this.DragScope.AllowDrop = previousAllowDrop;
DragDrop.RemovePreviewDragOverHandler(this.DragScope, dragOver);
DragDrop.RemovePreviewDragLeaveHandler(this.DragScope, dragLeave);
DragDrop.RemovePreviewQueryContinueDragHandler(this.DragSource, queryContinue);
}
}
else
{
DragDrop.AddPreviewQueryContinueDragHandler(this.DragSource, queryContinue = new QueryContinueDragEventHandler(OnQueryContinueDrag));
DragDrop.AddGiveFeedbackHandler(this.DragSource, giveFeedback = new GiveFeedbackEventHandler(OnGiveFeedback));
this.IsDragging = true;
if ((this.Callback.SupportedActions & DragDropProviderActions.Visual) != 0)
{
this.CreateDragDropWindow(dragelement);
this.dragdropWindow.Show();
}
try
{
resultEffects = DragDrop.DoDragDrop(this.DragSource, data, effects);
}
finally
{
}
if ((this.Callback.SupportedActions & DragDropProviderActions.Visual) != 0)
{
this.DestroyDragDropWindow();
}
DragDrop.RemovePreviewQueryContinueDragHandler(this.DragSource, OnQueryContinueDrag);
DragDrop.AddGiveFeedbackHandler(this.DragSource, OnGiveFeedback);
this.IsDragging = false;
this.DragFinished(resultEffects);
}
}
private void StartDrag(MouseEventArgs args)
{
IDataObject data = null;
UIElement dragelement = null;
// ADD THE DATA
if (this.Callback != null)
{
DragDataWrapper dw = new DragDataWrapper();
data = new DataObject(typeof(DragDataWrapper).ToString(), dw);
if ((this.Callback.SupportedActions & DragDropProviderActions.MultiFormatData) != 0)
{
this.Callback.AppendData(ref data, args);
}
if ((this.Callback.SupportedActions & DragDropProviderActions.Data) != 0)
{
dw.Data = this.Callback.GetData();
}
if ((this.Callback.SupportedActions & DragDropProviderActions.Visual) != 0)
{
dragelement = this.Callback.GetVisual(args);
}
else
{
dragelement = args.OriginalSource as UIElement;
}
dw.Source = this.DragSource;
dw.Shim = this.Callback;
Debug.Assert(this.DragScope == null, "The DragDataWrapper is meant for in-proc... Sorry for asserting, just wanted to confirm.. comment out assertion if needed");
}
else
{
dragelement = args.OriginalSource as UIElement;
data = new DataObject(typeof(UIElement).ToString(), dragelement);
}
if (dragelement == null || data == null || dragelement == this.DragSource)
{
return;
}
DragEventHandler dragOver = null;
DragEventHandler dragLeave = null;
QueryContinueDragEventHandler queryContinue = null;
GiveFeedbackEventHandler giveFeedback = null;
DragDropEffects effects = this.GetDragDropEffects();
DragDropEffects resultEffects;
// Inprocess Drag ...
if (this.DragScope != null)
{
bool previousAllowDrop = this.DragScope.AllowDrop;
this.adorner = new DragAdorner(this.DragScope, (UIElement)dragelement, true, this.Opacity);
this.layer = AdornerLayer.GetAdornerLayer(this.DragScope as Visual);
this.layer.Add(this.adorner);
if (this.DragScope != this.DragSource)
{
this.DragScope.AllowDrop = true;
DragDrop.AddPreviewDragOverHandler((DependencyObject)this.DragScope, dragOver = new DragEventHandler(DragScope_DragOver));
DragDrop.AddPreviewDragLeaveHandler(this.DragScope, dragLeave = new DragEventHandler(DragScope_DragLeave));
DragDrop.AddPreviewQueryContinueDragHandler(this.DragSource, queryContinue = new QueryContinueDragEventHandler(OnQueryContinueDrag));
}
try
{
this.IsDragging = true;
this.mouseLeftScope = false;
resultEffects = DragDrop.DoDragDrop(this.DragSource, data, effects);
this.DragFinished(resultEffects);
}
catch
{
Debug.Assert(false);
}
if (this.DragScope != this.DragSource)
{
this.DragScope.AllowDrop = previousAllowDrop;
DragDrop.RemovePreviewDragOverHandler(this.DragScope, dragOver);
DragDrop.RemovePreviewDragLeaveHandler(this.DragScope, dragLeave);
DragDrop.RemovePreviewQueryContinueDragHandler(this.DragSource, queryContinue);
}
}
else
{
DragDrop.AddPreviewQueryContinueDragHandler(this.DragSource, queryContinue = new QueryContinueDragEventHandler(OnQueryContinueDrag));
DragDrop.AddGiveFeedbackHandler(this.DragSource, giveFeedback = new GiveFeedbackEventHandler(OnGiveFeedback));
this.IsDragging = true;
if ((this.Callback.SupportedActions & DragDropProviderActions.Visual) != 0)
{
this.CreateDragDropWindow(dragelement);
this.dragdropWindow.Show();
}
try
{
resultEffects = DragDrop.DoDragDrop(this.DragSource, data, effects);
}
finally
{
}
if ((this.Callback.SupportedActions & DragDropProviderActions.Visual) != 0)
{
this.DestroyDragDropWindow();
}
DragDrop.RemovePreviewQueryContinueDragHandler(this.DragSource, OnQueryContinueDrag);
DragDrop.AddGiveFeedbackHandler(this.DragSource, OnGiveFeedback);
this.IsDragging = false;
this.DragFinished(resultEffects);
}
}
