public static bool OnNavigateChildren(this IPopupItem item)
{
if (!item.HasItems())
{
return(false);
}
item.PopupRoot.PopupManager.OpenedItem = item;
item.PopupChildren().SelectableItem().FirstOrDefault().NavigateItem();
return(true);
}
public static void OnKeyDownNavigate(this IPopupItem item, KeyEventArgs e)
{
if (!item.Handle(e))
{
return;
}
var key = e.Key;
var fe = item as FrameworkElement;
if (fe != null)
{
if (fe.FlowDirection == FlowDirection.RightToLeft)
{
switch (key)
{
case Key.Right:
key = Key.Left;
break;
case Key.Left:
key = Key.Right;
break;
}
}
}
var pm = item.PopupRoot.PopupManager;
bool isRoot = item.ParentItem() == null;
var top = item;
while (top.ParentItem() != null)
{
top = top.ParentItem();
}
if (key == Key.Tab)
{
bool shift = (Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift;
if (isRoot)
{
key = shift ? Key.Left : Key.Right;
}
else
{
key = shift ? Key.Up : Key.Down;
}
}
switch (key)
{
case Key.Escape:
if (isRoot)
{
Keyboard.Focus(null);
e.Handled = true;
}
else
{
e.Handled = null != item.ParentItem().NavigateItem(false);
}
break;
case Key.Right:
if (isRoot)
{
e.Handled = null != item.NavigateSibling(true, true);
}
else
{
if (item.HasItems())
{
item.OnNavigateChildren();
e.Handled = true;
}
else
{
pm.OpenedItem = top.NavigateSibling(true, true);
e.Handled = null != pm.OpenedItem;
}
}
break;
case Key.Left:
if (isRoot)
{
e.Handled = null != item.NavigateSibling(false, true);
}
else
{
if (item.ParentItem() != top)
{
e.Handled = null != item.ParentItem().NavigateItem();
}
else
{
pm.OpenedItem = top.NavigateSibling(false, true);
e.Handled = null != pm.OpenedItem;
}
}
break;
case Key.Up:
if (isRoot)
{
e.Handled = item.OnNavigateChildren();
}
else
{
e.Handled = null != item.NavigateSibling(false, true);
}
break;
case Key.Down:
if (isRoot)
{
e.Handled = item.OnNavigateChildren();
}
else
{
e.Handled = null != item.NavigateSibling(true, true);
}
break;
case Key.Enter:
case Key.Space:
e.Handled = true;
item.IsPressed = true;
break;
}
}
