[Mono-winforms-list] Bug in System.Windows.Forms.Control:get_ContainsFocus ()?

[Paddy Joy]

How about this code, I'm pretty sure that it instantiates button2 
correctly now but still gives the segmentation error.

I have declared the button with:
private testbutton button2;

and instantiated it with:
this.button2 = new testbutton();

Thanks for the help,
Paddy


using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace WindowsApplication4
{
    /// <summary>
    /// Summary description for Form1.
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Button button1;
        private testbutton button2;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new testbutton();
            this.SuspendLayout();
            //
            // button1
            //
            this.button1.Location = new System.Drawing.Point(96, 32);
            this.button1.Name = "button1";
            this.button1.TabIndex = 0;
            this.button1.Text = "button1";
            this.button1.Click += new 
System.EventHandler(this.button1_Click);
            //
            // button2
            //
            this.button2.Location = new System.Drawing.Point(96, 80);
            this.button2.Name = "button2";
            this.button2.TabIndex = 1;
            this.button2.Text = "button2";
            //
            // Form1
            //
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(292, 262);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);

        }
        #endregion

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }

        private void button1_Click(object sender, System.EventArgs e)
        {
            Console.Write(button2.Focused);
        }
    }

    public class testbutton : System.Windows.Forms.Button
    {
        
        public testbutton()
        {


        }

        public override bool Focused
        {
            get
            {
                return base.ContainsFocus;
            }
        }
 


    }
}

 
> Hi,
>
>   
>> So do you think it could be a bug with resolving the base class? It 
>> seems from the trace that it is going into a continuous loop, like it is 
>> calling ContainsFocus on itself.
>>     
>
> To be honest, all I saw was the segfault rather than the tonnes of
> output. The baseclass seems to be working fine as well
>
> I did the following to your code and if you run it, you'll see that the
> baseclass is fine
>
> using System;
> using System.Drawing;
> using System.Collections;
> using System.ComponentModel;
> using System.Windows.Forms;
> using System.Data;
>
> namespace WinApp4
> {
>   public class Form1 : System.Windows.Forms.Form
>   {
>     private System.Windows.Forms.Button button1;
>     private System.Windows.Forms.Button button2;
>     private System.ComponentModel.Container components = null;
>
>     public Form1()
>     {
>       InitializeComponent();
>     }
>
>     protected override void Dispose(bool disposing)
>     {
>       if (disposing)
>       {
>         if (components != null)
>         {
>           components.Dispose();
> 	}
>       }
>       base.Dispose(disposing);
>     }
>
>     private void InitializeComponent()
>     {
>       this.button1 = new System.Windows.Forms.Button();
>       this.button2 = new System.Windows.Forms.Button();
>       this.SuspendLayout();
>
>       this.button1.Location = new System.Drawing.Point(96, 32);
>       this.button1.Name = "button1";
>       this.button1.TabIndex = 0;
>       this.button1.Text = "button1";
>       this.button1.Click += new System.EventHandler(this.button1_Click);
>
>       this.button2.Location = new System.Drawing.Point(96, 80);
>       this.button2.Name = "button2";
>       this.button2.TabIndex = 1;
>       this.button2.Text = "button2";
>       this.button2.Click += new System.EventHandler(this.button2_Click);
>
>       this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
>       this.ClientSize = new System.Drawing.Size(292, 262);
>       this.Controls.Add(this.button2);
>       this.Controls.Add(this.button1);
>       this.Name = "Form1";
>       this.Text = "Form1";
>       this.ResumeLayout(false);
>     }
>
>     [STAThread]
>     static void Main()
>     {
>       Application.Run(new Form1());
>     }
>
>     private void button1_Click(object sender, System.EventArgs e)
>     {
>       Console.Write(base.ContainsFocus);
>     }
>
>     private void button2_Click(object sender, System.EventArgs e)
>     {
>       Console.WriteLine(base.ContainsFocus);
>     }
>   }
> }
>
> The output (at least on my box) is
>
> True (button 1 pressed - no return feed)
> TrueTrue (button 2 pressed)
>
> >From the looks of the original code, you've created the second button,
> but never properly instantated it (it is declared as private swf.button
> button2 at the start, but never created using this.button2 = new
> swf.button()). That (to me) is the most likely candidate for the
> breakage.
>
> TTFN
>
> Paul
>
>