private void MenuFlyout_Opened(object sender, object e)
{
if (_parentMenu.UpdateMenuItemsFlyoutPlacement() && !_menuFlyoutPlacementChanged)
{
_menuFlyoutPlacementChanged = true;
ShowMenu();
}
_parentMenu.CalculateBounds();
IsOpened = true;
VisualStateManager.GoToState(this, "Opened", true);
_parentMenu.IsInTransitionState = false;
if (!_menuFlyoutRepositioned)
{
var popup = VisualTreeHelper.GetOpenPopups(Window.Current).FirstOrDefault(p => p.Child is MenuFlyoutPresenter);
if (popup != null)
{
var mfp = (MenuFlyoutPresenter)popup.Child;
var height = mfp.ActualHeight;
var width = mfp.ActualWidth;
var flytoutButtonPoint = FlyoutButton.TransformToVisual(Window.Current.Content).TransformPoint(new Point(0, 0));
if ((width > Window.Current.Bounds.Width - flytoutButtonPoint.X &&
(MenuFlyout.Placement == FlyoutPlacementMode.Bottom)) ||
(height > Window.Current.Bounds.Height - flytoutButtonPoint.Y &&
(MenuFlyout.Placement == FlyoutPlacementMode.Right)))
{
ShowMenuRepositioned(width, height);
}
}
}
}
private void MenuFlyout_Opened(object sender, object e)
{
if (_parentMenu.UpdateMenuItemsFlyoutPlacement() && !_menuFlyoutPlacementChanged)
{
_menuFlyoutPlacementChanged = true;
ShowMenu();
}
_parentMenu.CalculateBounds();
IsOpened = true;
VisualStateManager.GoToState(this, "Opened", true);
_parentMenu.IsInTransitionState = false;
if (!_menuFlyoutRepositioned)
{
IReadOnlyList <Popup> popups;
UIElement content;
double outerContentWidth;
double outerContentHeight;
#if !HAS_UNO
if (ControlHelpers.IsXamlRootAvailable && MenuFlyout.XamlRoot != null)
{
popups = VisualTreeHelper.GetOpenPopupsForXamlRoot(MenuFlyout.XamlRoot);
content = MenuFlyout.XamlRoot.Content;
outerContentWidth = MenuFlyout.XamlRoot.Size.Width;
outerContentHeight = MenuFlyout.XamlRoot.Size.Height;
}
else
#endif
{
popups = VisualTreeHelper.GetOpenPopups(Windows.UI.Xaml.Window.Current);
content = Windows.UI.Xaml.Window.Current.Content;
outerContentWidth = Windows.UI.Xaml.Window.Current.Bounds.Width;
outerContentHeight = Windows.UI.Xaml.Window.Current.Bounds.Height;
}
var popup = popups.FirstOrDefault(p => p.Child is MenuFlyoutPresenter);
if (popup != null)
{
var mfp = (MenuFlyoutPresenter)popup.Child;
var height = mfp.ActualHeight;
var width = mfp.ActualWidth;
var flytoutButtonPoint = FlyoutButton.TransformToVisual(content).TransformPoint(new Point(0, 0));
if ((width > outerContentWidth - flytoutButtonPoint.X &&
(MenuFlyout.Placement == FlyoutPlacementMode.Bottom)) ||
(height > outerContentHeight - flytoutButtonPoint.Y &&
(MenuFlyout.Placement == FlyoutPlacementMode.Right)))
{
ShowMenuRepositioned(width, height);
}
}
}
}
private static bool NavigateUsingKeyboard(KeyEventArgs args, Menu menu, Orientation orientation)
{
object element;
if (ControlHelpers.IsXamlRootAvailable && menu.XamlRoot != null)
{
element = FocusManager.GetFocusedElement(menu.XamlRoot);
}
else
{
element = FocusManager.GetFocusedElement();
}
if (element is MenuFlyoutPresenter &&
((args.VirtualKey == VirtualKey.Down) ||
(args.VirtualKey == VirtualKey.Up) ||
(args.VirtualKey == VirtualKey.Left) ||
(args.VirtualKey == VirtualKey.Right)))
{
// Hack to delay and let next element get focus
FocusManager.FindNextFocusableElement(FocusNavigationDirection.Right);
return(true);
}
if (!menu.IsOpened && element is MenuItem)
{
menu.UpdateMenuItemsFlyoutPlacement();
if (args.VirtualKey == VirtualKey.Enter ||
((args.VirtualKey == VirtualKey.Down) && menu.CurrentFlyoutPlacement == FlyoutPlacementMode.Bottom) ||
((args.VirtualKey == VirtualKey.Up) && menu.CurrentFlyoutPlacement == FlyoutPlacementMode.Top) ||
((args.VirtualKey == VirtualKey.Left) && menu.CurrentFlyoutPlacement == FlyoutPlacementMode.Left) ||
((args.VirtualKey == VirtualKey.Right) && menu.CurrentFlyoutPlacement == FlyoutPlacementMode.Right))
{
menu.SelectedMenuItem.ShowMenu();
return(true);
}
if ((args.VirtualKey == VirtualKey.Left && orientation == Orientation.Horizontal) ||
(args.VirtualKey == VirtualKey.Up && orientation == Orientation.Vertical))
{
GetNextMenuItem(menu, -1);
return(true);
}
if ((args.VirtualKey == VirtualKey.Right && orientation == Orientation.Horizontal) ||
(args.VirtualKey == VirtualKey.Down && orientation == Orientation.Vertical))
{
GetNextMenuItem(menu, +1);
return(true);
}
}
if ((menu.CurrentFlyoutPlacement == FlyoutPlacementMode.Left &&
args.VirtualKey == VirtualKey.Right) ||
(args.VirtualKey == VirtualKey.Left &&
menu.CurrentFlyoutPlacement != FlyoutPlacementMode.Left))
{
if (element is MenuFlyoutItem)
{
menu.IsInTransitionState = true;
menu.SelectedMenuItem.HideMenu();
GetNextMenuItem(menu, -1).ShowMenu();
return(true);
}
if (element is MenuFlyoutSubItem menuFlyoutSubItem)
{
if (menuFlyoutSubItem.Parent is MenuItem && element == menu._lastFocusElement)
{
menu.IsInTransitionState = true;
menu.SelectedMenuItem.HideMenu();
GetNextMenuItem(menu, -1).ShowMenu();
return(true);
}
}
}
if ((args.VirtualKey == VirtualKey.Right &&
menu.CurrentFlyoutPlacement != FlyoutPlacementMode.Left) ||
(args.VirtualKey == VirtualKey.Left &&
menu.CurrentFlyoutPlacement == FlyoutPlacementMode.Left))
{
if (element is MenuFlyoutItem)
{
menu.IsInTransitionState = true;
menu.SelectedMenuItem.HideMenu();
GetNextMenuItem(menu, +1).ShowMenu();
return(true);
}
}
return(false);
}
private static bool NavigateUsingKeyboard(object element, KeyEventArgs args, Menu menu, Orientation orientation)
{
if (!menu.IsOpened && element is MenuItem)
{
menu.UpdateMenuItemsFlyoutPlacement();
if (args.VirtualKey == VirtualKey.Enter ||
((args.VirtualKey == VirtualKey.Down) && menu._currentFlyoutPlacement == FlyoutPlacementMode.Bottom) ||
((args.VirtualKey == VirtualKey.Up) && menu._currentFlyoutPlacement == FlyoutPlacementMode.Top) ||
((args.VirtualKey == VirtualKey.Left) && menu._currentFlyoutPlacement == FlyoutPlacementMode.Left) ||
((args.VirtualKey == VirtualKey.Right) && menu._currentFlyoutPlacement == FlyoutPlacementMode.Right))
{
menu.SelectedMenuItem.ShowMenu();
return true;
}
if ((args.VirtualKey == VirtualKey.Left && orientation == Orientation.Horizontal) ||
(args.VirtualKey == VirtualKey.Up && orientation == Orientation.Vertical))
{
GetNextMenuItem(menu, -1);
return true;
}
if ((args.VirtualKey == VirtualKey.Right && orientation == Orientation.Horizontal) ||
(args.VirtualKey == VirtualKey.Down && orientation == Orientation.Vertical))
{
GetNextMenuItem(menu, +1);
return true;
}
}
if ((menu._currentFlyoutPlacement == FlyoutPlacementMode.Left &&
args.VirtualKey == VirtualKey.Right) ||
(args.VirtualKey == VirtualKey.Left &&
menu._currentFlyoutPlacement != FlyoutPlacementMode.Left))
{
if (element is MenuFlyoutItem)
{
menu.IsInTransitionState = true;
menu.SelectedMenuItem.HideMenu();
GetNextMenuItem(menu, -1).ShowMenu();
return true;
}
if (element is MenuFlyoutSubItem)
{
var menuFlyoutSubItem = (MenuFlyoutSubItem)element;
if (menuFlyoutSubItem.Parent is MenuItem && element == menu._lastFocusElement)
{
menu.IsInTransitionState = true;
menu.SelectedMenuItem.HideMenu();
GetNextMenuItem(menu, -1).ShowMenu();
return true;
}
}
}
if ((args.VirtualKey == VirtualKey.Right &&
menu._currentFlyoutPlacement != FlyoutPlacementMode.Left) ||
(args.VirtualKey == VirtualKey.Left &&
menu._currentFlyoutPlacement == FlyoutPlacementMode.Left))
{
if (element is MenuFlyoutItem)
{
menu.IsInTransitionState = true;
menu.SelectedMenuItem.HideMenu();
GetNextMenuItem(menu, +1).ShowMenu();
return true;
}
}
return false;
}
