c# - 如何隐藏 AttachedFlyout 菜单的菜单项？

Question

我能够使用以下代码以编程方式显示右键单击菜单，显示/隐藏所需的菜单项很容易，因为我们可以根据需要创建 MenuFlyoutItem。

private void MyGrid_RightTapped(object sender, RightTappedRoutedEventArgs e)
{
    MenuFlyout myFlyout = new MenuFlyout();
    MenuFlyoutItem mnu1 = new MenuFlyoutItem { Text = "Rename" };    
    MenuFlyoutItem mnu2 = new MenuFlyoutItem { Text = "Delete" };    
    myFlyout.Items.Add(mnu1);   
    myFlyout.Items.Add(mnu2);
    mnu1.Click += mnu1_Click;
    mnu2.Click += mnu2_Click;

    FrameworkElement senderElement = sender as FrameworkElement;
    myFlyout.ShowAt(sender as UIElement, e.GetPosition(sender as UIElement));
}

但是，当我使用 xaml 作为 AttachedFlyout 创建菜单时，我无法隐藏特定的菜单项。这是我的代码:

    <ListView.ItemTemplate>
    <DataTemplate >
..............
        <Grid Name="GrdForFolderMenu">
            <FlyoutBase.AttachedFlyout >
                <MenuFlyout Placement="Right">
                    <MenuFlyoutItem Name="MenuFolderCreate" Text="New Folder" Click="MenuFolderCreate_Click" DataContext="Folders"/>
                    <MenuFlyoutItem Name="MenuFolderRename"  Text="Rename" Click="MenuFolderRename_Click"/>
                    <MenuFlyoutItem Name="MenuFolderExport"  Text="Export" Click="MenuFolderExport_Click" />
                    <MenuFlyoutSeparator />
                    <MenuFlyoutItem Name="MenuFolderDelete"  Text="Delete" Click="MenuFolderDelete_Click" />
                </MenuFlyout>
            </FlyoutBase.AttachedFlyout>
        ......
        ........

这是我的右键单击事件:

private void myListView_RightTapped(object sender, RightTappedRoutedEventArgs e)
{            
  FlyoutBase.ShowAttachedFlyout((FrameworkElement)sender);
}

努力在代码中隐藏特定的菜单项!请帮忙!

Answer 1

您只需获取 MenuFlyout 并将特定 MenuFlyoutItem 的 Visibility 设置为 Collapsed 或从列表中删除它。

if (FlyoutBase.GetAttachedFlyout((FrameworkElement)sender) is MenuFlyout menuFlyout)
{
    // Hide 'MenuFolderExport' MenuFlyoutItem
    //menuFlyout.Items[2].Visibility = Visibility.Collapsed;

    // Or, remove 'MenuFolderExport' MenuFlyoutItem
    menuFlyout.Items.Remove(menuFlyout.Items[2]);
}

FlyoutBase.ShowAttachedFlyout((FrameworkElement)sender);

我还将 RightTapped 附加到您的 GrdForFolderMenu 并将所有 Name="xxx" 替换为 x:Name= "xxx".