WPF 文本框在系统托盘的上下文菜单中显示时不允许输入

Question

I want to provide search functionality on context menu displayed in the system tray. I am using System.Windows.Forms.NotifyIcon class to display the context menu in the tray. Basically this search should allow the user to find the required menu from the context menu. For that, I added the WPF textbox like this in the below image, but it does not allow me to type the text.

Is there any way to handle the text input on this?

Here is my code, MainWindow.xaml

<Window x:Class="SysTray_Sample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:SysTray_Sample"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <ContextMenu x:Key="NotifierContextMenu"

                    Placement="MousePoint">
            <MenuItem Header="First" StaysOpenOnClick="True"/>
            <MenuItem StaysOpenOnClick="True">
                <MenuItem.Header>
                    <TextBox Text="Test" Width="120" />
                </MenuItem.Header>
            </MenuItem>
            
            <MenuItem Header="Open" Click="Menu_Open"/>
            <MenuItem Header="Close" Click="Menu_Close"/>

        </ContextMenu>
    </Window.Resources>
    <Grid>
        <Button Height="22" Width="180" Content="Right click over me">
            <Button.ContextMenu>
                <ContextMenu>
                    <MenuItem Click="MenuItem_Click" Header="Minimize to system tray"/>
                    <MenuItem Header="Desktop mode"/>
                    <TextBox Width="150"/>
                </ContextMenu>
            </Button.ContextMenu>
        </Button>
    </Grid>
</Window>

MainWindow.xaml.cs

public partial class MainWindow : Window
    {
        private System.Windows.Forms.NotifyIcon _trayIcon;

        public MainWindow()
        {
            InitializeComponent();
            _trayIcon = new System.Windows.Forms.NotifyIcon();
            _trayIcon.MouseDown += MyNotifyIcon_MouseDown;
            _trayIcon.Icon = new System.Drawing.Icon(@"Resources\add.ico");
            _trayIcon.MouseDoubleClick += MyNotifyIcon_MouseDoubleClick;
        }

        private void MyNotifyIcon_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Right)
            {
                ContextMenu menu = (ContextMenu)this.FindResource("NotifierContextMenu");
                menu.IsOpen = true;
            }
        }

        private void MyNotifyIcon_MouseDoubleClick(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            this.WindowState = WindowState.Normal;
            _trayIcon.Visible = false;
            this.ShowInTaskbar = true;
        }

        private void MenuItem_Click(object sender, RoutedEventArgs e)
        {
            this.ShowInTaskbar = false;
            _trayIcon.BalloonTipTitle = "Minimize Sucessful";
            _trayIcon.BalloonTipText = "Minimized the app ";
            _trayIcon.ShowBalloonTip(400);
            _trayIcon.Visible = true;
            this.WindowState = WindowState.Minimized;
        }

        private void Menu_Open(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Open");
        }

        private void Menu_Close(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Close");
        }
    }

Answer 1

After a long hour of searching, I found the following solution which worked for my case. https://www.codeproject.com/Questions/184429/Text-box-is-not-working-in-WPF-Popup

[DllImport("USER32.DLL")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        public static void ActivateVisual(FrameworkElement contextMenu)
        {
            var fromVisual = HwndSource.FromDependencyObject(contextMenu);
            HwndSource source = (HwndSource)fromVisual;
            IntPtr handle = source.Handle;

            SetForegroundWindow(handle);
        }

Here is my complete MainWindow.xaml.cs code,

public partial class MainWindow : Window
    {
        private System.Windows.Forms.NotifyIcon _trayIcon;

        [DllImport("USER32.DLL")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        public static void ActivateVisual(FrameworkElement contextMenu)
        {
            var fromVisual = HwndSource.FromDependencyObject(contextMenu);
            HwndSource source = (HwndSource)fromVisual;
            IntPtr handle = source.Handle;

            SetForegroundWindow(handle);
        }

        public MainWindow()
        {
            InitializeComponent();
            _trayIcon = new System.Windows.Forms.NotifyIcon();
            _trayIcon.MouseDown += MyNotifyIcon_MouseDown;
            _trayIcon.Icon = new System.Drawing.Icon(@"C:\Users\nambi\source\repos\SysTray_Sample\SysTray_Sample\Resources\add.ico");
            _trayIcon.MouseDoubleClick += MyNotifyIcon_MouseDoubleClick;
        }

        private void MyNotifyIcon_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Right)
            {
                ContextMenu menu = (ContextMenu)this.FindResource("NotifierContextMenu");                
                menu.IsOpen = true;
                ActivateVisual(this.ContextMenu);
            }
        }

        private void MyNotifyIcon_MouseDoubleClick(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            this.WindowState = WindowState.Normal;
            _trayIcon.Visible = false;
            this.ShowInTaskbar = true;
        }

        private void MenuItem_Click(object sender, RoutedEventArgs e)
        {
            this.ShowInTaskbar = false;
            _trayIcon.BalloonTipTitle = "Minimize Sucessful";
            _trayIcon.BalloonTipText = "Minimized the app ";
            _trayIcon.ShowBalloonTip(400);
            _trayIcon.Visible = true;
            this.WindowState = WindowState.Minimized;
        }



        private void Menu_Open(object sender, RoutedEventArgs e)
        {
            ActivateVisual(this);
            MessageBox.Show("Open");
        }



        private void Menu_Close(object sender, RoutedEventArgs e)
        {
            ActivateVisual(this);
            MessageBox.Show("Close");
        }
    }