I'm trying to implement a right click context menu using UI automation. Since UI automation does not have a native right click pattern I am adding an ExpandCollapse provider to the listview's AutomationPeer class and mapping the expand and collapse to opening and closing the context menu.
My question, is there a better method of invoking the context menu that doesn't involve trying to instantiate a class with a private constructor? I can't use SendKeys with Shift-F10. I'd like to use the PopupControlService but that is tagged as internal.
My awful workaround:
public class MyListViewAutomationPeer : ListViewAutomationPeer, IExpandCollapseProvider
{
public MyListViewAutomationPeer(MyListView owner)
: base(owner){}
public override object GetPattern(PatternInterface patternInterface)
{
if (patternInterface == PatternInterface.ExpandCollapse)
{
return this;
}
return base.GetPattern(patternInterface);
}
public void Expand()
{
MyListView owner = (MyListView)Owner;
//**********************
//Ouch!!! What a hack
//**********************
//ContextMenuEventArgs is a sealed class, with private constructors
//Instantiate it anyway ...
ContextMenuEventArgs cmea = (ContextMenuEventArgs)FormatterServices.GetUninitializedObject(typeof(ContextMenuEventArgs));
cmea.RoutedEvent = MyListView.ContextMenuOpeningEvent;
cmea.Source = owner;
//This will fire any developer code that is bound to the OpenContextMenuEvent
owner.RaiseEvent(cmea);
//The context menu didn't open because this is a hack, so force it open
owner.ContextMenu.Placement = PlacementMode.Center;
owner.ContextMenu.PlacementTarget = (UIElement)owner;
owner.ContextMenu.IsOpen = true;
}