/// <summary>
/// Prepares the specified element to display the specified item.
/// </summary>
/// <param name="element">Element used to display the specified item.</param>
/// <param name="item">Specified item.</param>
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
base.PrepareContainerForItemOverride(element, item);
DropDownItemBaseControl control = item as DropDownItemBaseControl;
if (control != null)
{
control.ParentDropDownList = this;
}
}
/// <summary>
/// Invoked when the <see cref="E:System.Windows.UIElement.KeyDown" /> event is received.
/// </summary>
/// <param name="e">Information about the event.</param>
protected override void OnKeyDown(KeyRoutedEventArgs e)
{
if (!e.Handled)
{
switch (e.Key)
{
case VirtualKey.Left:
case VirtualKey.Up:
goto Label_0046;
case VirtualKey.Right:
case VirtualKey.Down:
goto Label_0056;
case VirtualKey.Escape:
Close();
e.Handled = true;
break;
case VirtualKey.Tab:
if (CoreWindow.GetForCurrentThread().GetKeyState(VirtualKey.Shift) == CoreVirtualKeyStates.None)
{
goto Label_0056;
}
goto Label_0046;
case VirtualKey.Enter:
if (SelectedItemIndex >= 0)
{
DropDownItemBaseControl control = base.ContainerFromIndex(SelectedItemIndex) as DropDownItemBaseControl;
if (control != null)
{
if (!control.CanExecuteCommand())
{
break;
}
control.ExecuteCommand();
}
}
Close();
e.Handled = true;
break;
}
}
goto Label_00C3;
Label_0046:
SelectNextItem(false);
e.Handled = true;
goto Label_00C3;
Label_0056:
SelectNextItem(true);
e.Handled = true;
Label_00C3:
base.OnKeyDown(e);
}
bool SelectItem(int index, bool forward)
{
DropDownItemBaseControl control = base.ContainerFromIndex(index) as DropDownItemBaseControl;
if ((control == null) || !control.CanSelect)
{
return(false);
}
if (SelectedItemIndex >= 0)
{
DropDownItemBaseControl control2 = base.ContainerFromIndex(SelectedItemIndex) as DropDownItemBaseControl;
if (control2 != null)
{
control2.IsSelected = false;
}
}
control.IsSelected = true;
control.SelectChild(forward);
SelectedItemIndex = index;
return(true);
}
