C# – mdi child form maximized windowstate – BorderStyle

cmdichildmdiparentvb.netwinforms

I want to open a child form inside parent with maximized windowstate.

I don't want to let the user minimize/ maximize/ close that child window,

so I set BorderStyle = None for childwindow and also set MaximizeBox and MinimizeBox properties to False, also set WindowState = Maximized

But when I run the program it shows all Minimize, Restore and Close buttons for that childForm in maximized state.

but if I click Restore Down then there is no border for that childForm..now No way to restore it to maximized state also..

Am I missing something? Is this a bug? What is the proper way of making it work correctly?

Best Answer

just try this one.

protected override void WndProc(ref Message m)
{
    const int WM_SYSCOMMAND = 0x0112;
    const int SC_MOVE = 0xf010;
    switch (m.Msg)
    {
        case WM_SYSCOMMAND:
            int command = m.WParam.ToInt32() & 0xfff0;
            if (command == SC_MOVE)
                return;
            break;

    }
    base.WndProc(ref m);
}

Related Solutions

C# – Maximize MDI child form

The problem wasn't easy to solve, but I accidentally found the answer and it's quite simple; set the windowstate of the child form to Normal by default. Then make sure that you reset the windowstate of the child window AFTER you call the Show() method.

Example:

private void ShowNewForm(object sender, EventArgs e)
{
  Form childForm = new Form();
  childForm.MdiParent = this;
  childForm.Text = "Window " + childFormNumber++;
  childForm.Show();
  childForm.WindowState = FormWindowState.Maximized;
}

C# – How to set Parent Form WindowState property from Child Form

Your problem is that Form2 Parent property is null, calling Show() method doesn't actually set the Parent property of the shown Form (check it in debugger). The simplest workaround would be to pass Form1 (calling Form) reference through constructor of the Form2 (called Form) and than use that reference to set the WindowState property. Something like this:

public partial class Form2 : Form
{
    Form1 form1;
    public Form2(Form1 frm)
    {
        InitializeComponent();
        form1 = frm;
        this.SizeChanged +=Form2_SizeChanged;
    }

    private void Form2_SizeChanged(object sender, EventArgs e)
    {
        if (this.WindowState != FormWindowState.Maximized)
            form1.WindowState = this.WindowState;
    }
}

And than in the code of the Form1 you could change to:

this.ControlBox = false;
Form2 frm = new Form2(this);
frm.Show();

Best Answer

Related Solutions

C# – Maximize MDI child form

C# – How to set Parent Form WindowState property from Child Form

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