Button inside a WinForms textbox

Question

Do WinForms textboxes have any properties that make an embedded button, at the end of the box, possible?

Something like the favorites button on the Chrome address bo

Answer 1

I saw in Reflector that Control contains "SendMessage(int,int,int)" method and I found another way.

using System;
using System.Reflection;
using System.Windows.Forms;

static class ControlExtensions
{
    static BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
    static Type[] SendMessageSig = new Type[] { typeof(int), typeof(int), typeof(int) };

    internal static IntPtr SendMessage(this Control control, int msg, int wparam, int lparam)
    {
        MethodInfo MethodInfo = control.GetType().GetMethod("SendMessage", flags, null, SendMessageSig, null);

        return (IntPtr)MethodInfo.Invoke(control, new object[] { msg, wparam, lparam });
    }
}

Now by overriding WndProc in ButtonTextBox we can achieve desired effect.

public class ButtonTextBox : TextBox
{
    Button button;

    public ButtonTextBox()
    {
        this.button = new Button();
        this.button.Dock = DockStyle.Right;
        this.button.BackColor = SystemColors.Control;
        this.button.Width = 21;
        this.Controls.Add(this.button);
    }

    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);

        switch (m.Msg)
        {
            case 0x30:
                int num = this.button.Width + 3;
                this.SendMessage(0xd3, 2, num << 16);
                return;
        }
    }
}

And I think this is much safer way.