add AutoScroll bar to form

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Hi,

I add a child form to my form.

When I drag it out of the bounds of the parent form, a scroll bar appears.

The following is the code to implement this.

But I want it so that when I move the inside child form, the scroll bar could scroll to the new area of the child form.

Does anyone have any ideas?

Thanks.

C++

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

namespace WindowsFormsApplication1
{
  public class Form1 : Form
  {
    public Form1()
    {
      this.AutoScroll = true;
      Form frm_child = new Form();
      frm_child.TopLevel = false;
      this.Controls.Add(frm_child);
      frm_child.Show();
    }
  }
}

Posted 14-Jun-10 22:21pm

shujsj2010

Updated 14-Jun-10 23:14pm

Dalek Dave

v2

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Dalek Dave 15-Jun-10 5:14am

Edited for readability and correct placement of code tags.

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TheyCallMeMrJames · Answer 1 · 2010-06-15T06:51:00

First off...anything to do with scrolling on WinForms is flakey.

For simplicity sake (and so I don't have to write something to manage windows) move the declaration of frm_child to the class level.

public partial class Form1 : Form
{
    Form frm_child = new Form();
...

Add this (when you create the form):

frm_child.Enter += new EventHandler(frm_child_Enter);

...and in the event handler:

void frm_child_Enter(object sender, EventArgs e)
{
    this.ScrollControlIntoView(frm_child);
}

Basically, if any control is activated in the form, enter will fire and then you are telling the 'parent' form to scroll the other one into view.

It's even worse if you try to use MDI...

Cheers,
-jc