static void DragSource_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
// If the sender is allows multiple selections, select the DragInfo source item
ItemsControl itemsControl = sender as ItemsControl;
if (m_DragInfo != null &&
m_DragInfo.VisualSourceItem != null &&
itemsControl != null &&
itemsControl.CanSelectMultipleItems() &&
Keyboard.Modifiers != ModifierKeys.Shift &&
Keyboard.Modifiers != ModifierKeys.Control &&
Keyboard.Modifiers != (ModifierKeys.Control | ModifierKeys.Shift))
{
IEnumerable <object> selectedItems = itemsControl.GetSelectedItems().Cast <object>();
if (selectedItems.Count() > 1 && selectedItems.Contains(m_DragInfo.SourceItem))
{
itemsControl.SetSelectedItem(m_DragInfo.SourceItem);
}
}
if (m_DragInfo != null)
{
m_DragInfo = null;
}
}
static void DragSource_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// Ignore the click if the user has clicked on a scrollbar.
if (HitTestScrollBar(sender, e) || e.ClickCount > 1)
{
m_DragInfo = null;
return;
}
m_DragInfo = new DragInfo(sender, e);
// If the sender is a list box that allows multiple selections, ensure that clicking on an
// already selected item does not change the selection, otherwise dragging multiple items
// is made impossible.
ItemsControl itemsControl = sender as ItemsControl;
if (m_DragInfo.VisualSourceItem != null && itemsControl != null && itemsControl.CanSelectMultipleItems())
{
IEnumerable selectedItems = itemsControl.GetSelectedItems();
if (selectedItems.Cast <object>().Contains(m_DragInfo.SourceItem))
{
// TODO: Re-raise the supressed event if the user didn't initiate a drag.
e.Handled = true;
}
}
}
static void DragSource_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// Ignore the click if the user has clicked on a scrollbar.
if (HitTestScrollBar(sender, e))
{
m_DragInfo = null;
return;
}
m_DragInfo = new DragInfo(sender, e);
// If the sender is a list box that allows multiple selections, ensure that clicking on an
// already selected item does not change the selection, otherwise dragging multiple items
// is made impossible.
ItemsControl itemsControl = sender as ItemsControl;
// ignore the event if we reraised it to assure correct behavior
if (ignoreEventOnce)
{
if (itemsControl is Selector && sourceItemTemp != null)
{
((Selector)itemsControl).SelectedItem = null;
}
ignoreEventOnce = false;
return;
}
if (m_DragInfo.VisualSourceItem != null && itemsControl != null && itemsControl.CanSelectMultipleItems())
{
IEnumerable selectedItems = itemsControl.GetSelectedItems();
if (selectedItems.Cast <object>().Contains(m_DragInfo.SourceItem))
{
if (e.ClickCount == 1)
{
if (itemsControl is Selector && Keyboard.Modifiers != ModifierKeys.Shift && Keyboard.Modifiers != ModifierKeys.Control)
{
sourceItemTemp = m_DragInfo.SourceItem;
argsSaved = e;
e.Handled = true;
}
}
}
}
}