Walkabout.Utilities.DragDropSource OnDragSource(object source)
{
Walkabout.Utilities.DragDropSource returnSource = null;
ListBoxItem listBoxItemControl = WpfHelper.FindAncestor <ListBoxItem>((DependencyObject)source);
if (listBoxItemControl != null)
{
Payee payee = listBoxItemControl.Content as Payee;
if (payee != null)
{
returnSource = new DragDropSource();
returnSource.DataSource = payee;
returnSource.VisualForDraginSource = listBoxItemControl;
}
}
return(returnSource);
}
Walkabout.Utilities.DragDropSource OnDragSource(object source)
{
Walkabout.Utilities.DragDropSource returnSource = null;
ListBoxItem listBoxItemControl = WpfHelper.FindAncestor <ListBoxItem>((DependencyObject)source);
if (listBoxItemControl != null)
{
Security x = listBoxItemControl.Content as Security;
if (x != null)
{
returnSource = new DragDropSource();
returnSource.DataSource = x;
returnSource.VisualForDraginSource = CreateDragVisual(x);
}
}
return(returnSource);
}
Walkabout.Utilities.DragDropSource OnDragDropObjectSource(object source)
{
Walkabout.Utilities.DragDropSource returnSource = null;
if (IsEditing)
{
// turn off drag when in editing mode
}
else
{
TreeViewItem treeViewItem = WpfHelper.FindAncestor <TreeViewItem>((DependencyObject)source);
if (treeViewItem != null)
{
// First child of a TreeViewItem seems to always be a Grid in all Themes
FrameworkElement grid = VisualTreeHelper.GetChild(treeViewItem, 0) as FrameworkElement;
if (grid != null)
{
//
// The grid has 2 child
// 0 = Expander
// 1 = Tree Node visual
//
//
// We want the TreeNode visual without the Expander
FrameworkElement representationOfTheTreeNodeToDrag = VisualTreeHelper.GetChild(grid, 1) as FrameworkElement;
if (representationOfTheTreeNodeToDrag != null)
{
Category category = treeViewItem.Header as Category;
if (category != null)
{
returnSource = new DragDropSource();
returnSource.DataSource = category;
returnSource.VisualForDraginSource = representationOfTheTreeNodeToDrag;
}
}
}
}
}
return(returnSource);
}
private void StartDrag(MouseEventArgs e, DragDropSource objectBeenDragged)
{
DestroyDragDropWindow();
this.isDragging = true;
GiveFeedbackEventHandler feedbackHandler = new GiveFeedbackEventHandler(OnDragSourceGiveFeedback);;
this.mainControl.GiveFeedback += feedbackHandler;
QueryContinueDragEventHandler queryContinueHandler = new QueryContinueDragEventHandler(OnDragSourceQueryContinueDrag);
this.mainControl.QueryContinueDrag += queryContinueHandler;
try
{
if (objectBeenDragged.VisualForDraginSource == null)
{
objectBeenDragged.VisualForDraginSource = new Rectangle();
}
CreateDragDropWindow(objectBeenDragged.VisualForDraginSource);
// Initialize the drag & drop operation
DataObject dragData = new DataObject(formatName, objectBeenDragged.DataSource);
DragDrop.DoDragDrop(this.mainControl, dragData, DragDropEffects.Move | DragDropEffects.Copy);
}
catch
{
}
finally
{
this.isDragging = false;
DestroyDragDropWindow();
this.mainControl.GiveFeedback -= feedbackHandler;
this.mainControl.QueryContinueDrag -= queryContinueHandler;
}
}
void OnPreviewMouseMove(object sender, MouseEventArgs e)
{
if (this.isMouseDown == false)
{
return;
}
if (e.LeftButton == MouseButtonState.Pressed)
{
// Get the current mouse position
Point mousePos = e.GetPosition(this.mainControl);
Vector diff = this.dragStartPoint - mousePos;
if (Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance || Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance)
{
// Find out if we have a acceptable object instance behind for the UIElement being dragged
DragDropSource validObjectToDrag = calledBackForValidatingSource(dragSourceStartedFrom);
if (validObjectToDrag != null)
{
StartDrag(e, validObjectToDrag);
}
}
}
}
