Vertically (only) resizable windows form in C#

user_158876 0
Viewed 28145

I have a situation where it would be beneficial to me to allow my windows form to be resized by the user, but only vertically. After some searching, it seems like there isn't much on this particular subject. Is it possible?

resize winforms c#
6 Answers

You need to set the form's MinimumSize and MaximumSize properties to two sizes with different heights but equal widths.

If you don't want the horizontal resize cursor to appear at all, you'll need to handle the WM_NCHITTEST message, like this:

protected override void WndProc(ref Message m) {
    base.WndProc(ref m);
    switch (m.Msg) {
        case 0x84: //WM_NCHITTEST
            var result = (HitTest)m.Result.ToInt32();
            if (result == HitTest.Left || result == HitTest.Right)
                m.Result = new IntPtr((int)HitTest.Caption);
            if (result == HitTest.TopLeft || result == HitTest.TopRight)
                m.Result = new IntPtr((int)HitTest.Top);
            if (result == HitTest.BottomLeft || result == HitTest.BottomRight)
                m.Result = new IntPtr((int)HitTest.Bottom);

            break;
    }
}
enum HitTest {
    Caption = 2,
    Transparent = -1,
    Nowhere = 0,
    Client = 1,
    Left = 10,
    Right = 11,
    Top = 12,
    TopLeft = 13,
    TopRight = 14,
    Bottom = 15,
    BottomLeft = 16,
    BottomRight = 17,
    Border = 18
}
user_343970

Just an idea...

public partial class Form1 : Form {
    int _width;

    public Form1() {
        _width = this.Width;
        InitializeComponent();
    }

    protected override void OnResize(EventArgs e) {
        this.Width = _width;
        base.OnResize(e);
    }
}

EDIT: please note that the min/max size solutions work much better than this hack :)

orsogufo_156220

Set the max & min size for the width of the form only.

user_1064030

Let the FormBorderStyle to Resizable and set MaximumSize and MinimumSize = new Size(this.Width, 0)

Correction:

this.MinimumSize = new Size(this.Width, 0);
this.MaximumSize = new Size(this.Width, Int32.MaxValue);
user_2516510

Yes, it is possible. Just set your form.MinimumSize.Width = form.MaximumSize.Width = 100 (or whatever width you want).

user_934620

To avoid the "rubber-banding" effect of @orsogufo's solution:

public Form1()
{
    InitializeComponent();
    this.MinimumSize = new Size(500, 0);
    this.MaximumSize = new Size(500, Screen.AllScreens.Max(s => s.Bounds.Height));
}

It won't correctly adjust its maximum height to accommodate a larger screen if you resize the screen bounds, but for static screen sizes it works great.

user_1145830
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