CODEWITHSUNDEEP
c#winforms
denied66
denied66

Reputation: 644

Move borderless form using menustrip

I'm looking for a way to move the form by using a menustrip.

Although there are a few solutions around, there is a particular problem with them which I don't like. In order for those methods to work the form needs to be already focused before dragging the menustrip.

Is there a way of fixing that particular issue so the menustrip will actually behave like a proper windows title bar ?

Upvotes: 4

Views: 1994

Answers (1)

Du D.
Du D.

Reputation: 5310

The best bet is to use pinvoke. Tie the "mousedown" event to which ever control you want to be dragable.

using System.Runtime.InteropServices;

public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;

[DllImportAttribute("user32.dll")]
private static extern int SendMessage(IntPtr hWnd,
                 int Msg, int wParam, int lParam);
[DllImportAttribute("user32.dll")]
private static extern bool ReleaseCapture();

public Form1()
{
    InitializeComponent();
}

private void menuStrip1_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        ReleaseCapture();
        SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
    }
}

This still require the form to be focused, but you can work around using mouse hover. It is not that elegant but it works.

private void menuStrip1_MouseHover(object sender, EventArgs e)
{
    Focus();
}

Update: Hover has a slight delay, mousemove is much more responsive

private void menuStrip1_MouseMove(object sender, MouseEventArgs e)
{
    if (!Focused)
    {
        Focus();
    }
}

Upvotes: 4

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