Make a borderless form movable?

Question

Is there a way to make a form that has no border (FormBorderStyle is set to \"none\") movable when the mouse is clicked down on the form just as if there was a border?

Answer 1

I tried the following and presto changeo, my transparent window was no longer frozen in place but could be moved!! (throw away all those other complex solutions above...)

   private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        base.OnMouseLeftButtonDown(e);
        // Begin dragging the window
        this.DragMove();
    }

Answer 2

use MouseDown, MouseMove and MouseUp. You can set a variable flag for that. I have a sample, but I think you need to revise.

I am coding the mouse action to a panel. Once you click the panel, your form will move with it.

//Global variables;
private bool _dragging = false;
private Point _offset;
private Point _start_point=new Point(0,0);


private void panel1_MouseDown(object sender, MouseEventArgs e)
{
   _dragging = true;  // _dragging is your variable flag
   _start_point = new Point(e.X, e.Y);
}

private void panel1_MouseUp(object sender, MouseEventArgs e)
{
   _dragging = false; 
}

private void panel1_MouseMove(object sender, MouseEventArgs e)
{
  if(_dragging)
  {
     Point p = PointToScreen(e.Location);
     Location = new Point(p.X - this._start_point.X,p.Y - this._start_point.Y);     
  }
}

Answer 3

Form1(): new Moveable(control1, control2, control3);

Class:

using System;
using System.Windows.Forms;

class Moveable
{
    public const int WM_NCLBUTTONDOWN = 0xA1;
    public const int HT_CAPTION = 0x2;
    [System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
    public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
    [System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
    public static extern bool ReleaseCapture();
    public Moveable(params Control[] controls)
    {
        foreach (var ctrl in controls)
        {
            ctrl.MouseDown += (s, e) =>
            {
                if (e.Button == MouseButtons.Left)
                {
                    ReleaseCapture();
                    SendMessage(ctrl.FindForm().Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
                    // Checks if Y = 0, if so maximize the form
                    if (ctrl.FindForm().Location.Y == 0) { ctrl.FindForm().WindowState = FormWindowState.Maximized; }
                }
            };
        }
    }
}