internal void UnfocusControl(Control control)
{
if (control == null || !control.IsEnabled || !control.IsTabStop)
{
return;
}
// "Unfocusing" doesn't really make sense on Windows; for accessibility reasons,
// something always has focus. So forcing the unfocusing of a control would normally
// just move focus to the next control, or leave it on the current control if no other
// focus targets are available. This is what happens if you use the "disable/enable"
// hack. What we *can* do is set the focus to the Page which contains Control;
// this will cause Control to lose focus without shifting focus to, say, the next Entry
if (_containingPage == null)
{
// Work our way up the tree to find the containing Page
DependencyObject parent = Control as Control;
while (parent != null && !(parent is Windows.UI.Xaml.Controls.Page))
{
parent = VisualTreeHelper.GetParent(parent);
}
_containingPage = parent as Windows.UI.Xaml.Controls.Page;
}
if (_containingPage != null)
{
// Cache the tabstop setting
var wasTabStop = _containingPage.IsTabStop;
// Controls can only get focus if they're a tabstop
_containingPage.IsTabStop = true;
_containingPage.Focus(FocusState.Programmatic);
// Restore the tabstop setting; that may cause the Page to lose focus,
// but it won't restore the focus to Control
_containingPage.IsTabStop = wasTabStop;
}
}
