Maximizing child mdi in limited area

c# mdiparent mdichild
Scott Chantry picture Scott Chantry · Oct 22, 2009 · Viewed 7.1k times · Source

I have a form which is a mdicontainer and has a menu strip at the top. I add a child form to my mdi container and when I maximize the child it maximizes over the menustrip. I want to know how to limit the child to maximize below the menustrip. Any help would be appreciated.

Answer

MusiGenesis picture MusiGenesis · Oct 22, 2009

Your child form is being maximized in the way that child forms are supposed to be maximized in MDI. It's not really covering the menu strip of the parent form - it's actually merging its own menu strip with that of the parent form.

To make the child form take up only the available child area in the MDI parent (and not merge its menu with the parent's menu), put something like this code in the child form's Resize event:

if (this.WindowState == FormWindowState.Maximized)
{
    this.WindowState = FormWindowState.Normal;
    this.Size = this.MdiParent.ClientSize;
    this.Location = new Point(0, 0);
}

which will prevent the child window from being actually maximized.

I say "something like this code" because this snippet doesn't work exactly right. The ClientSize property of the parent form gives the overall size of the form, whereas you want to use the size of just the MDI client area. I don't know how to get that, and apparently it's not super-easy. See this question:

Size/Location of Winforms MDI Client Area

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