Change the style of WinForm border?

Question

Is it possible to change the style of a WinForm border? I know that if the border is removed, it takes away the functionality to resize the program. Therefore is there a way to change the style of it? At the moment, I've removed the text from the border, set the "FormBorderStyle" to "SizableToolWindow" and set the "ControlBox" to false. That makes it look like this:

But I want it to look something like this, but still be resizeable: (Maybe with a different color line)

Answer 1

I dont think there is a direct way to do this.

But, you could set the form border style to None. And implement the resizing in your form(which I don't think its difficult)

Answer 2

What you seek is not simple because the border is drawn by the operating system. However, there is a library on CodePlex that does make possible to do this very thing.

Drawing Custom Borders in Windows Forms

Answer 3

string position = String.Empty;
Point mouseDownPosition = new Point();

private void myForm_MouseDown(object sender, MouseEventArgs e)
{
    position = (e.X == 0) ? "Left" : ((e.X == myForm.Width) ? "Right" : String.Empty;
    position += (e.Y == 0) ? "Top" : ((e.Y == myForm.Height) ? "Bottom" : String.Empty;
    if(position != String.Empty)
    {
        mouseDownPosition = e.Location;
    }
}

private void myForm_MouseMove(object sender, MouseEventArgs e)
{
    if(position != String.Empty)
    {        
        Point movementOffset = new Point(e.Location.X - mouseDownPosition.X, e.Location.Y - mouseDownPosition.Y);
        Switch(position)
        {
            Case "LeftTop":
                myForm.Location.X += movementOffset.X;
                myForm.Location.Y += movementOffset.Y;
                myForm.Width -= movementOffset.X;
                myForm.Height -= movementOffset.Y;
            Case "Left":
                myForm.Location.X += movementOffset.X;
                myForm.Width -= movementOffset.X;
            // Complete the remaining please :)
        }
    }
}

private void myForm_MouseUp(object sender, MouseEventArgs e)
{
    position = String.Empty;
}

P.S: Have not yet tested it

Hope you've set FormBorderStyle to None

Answer 4

First write this in the InitializeComponent():

public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_RIGHT = 0xB;

this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;

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

this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Resize_Form);

Then, use a method similar to this. In this case, my form is only resizable from the right side, but should be easy to make it resize from any side:

    private void Resize_Form(object sender, MouseEventArgs e)
    {
        if ((e.Button == MouseButtons.Left) && (MousePosition.X >= this.Location.X + formWidth - 10))
        {
            System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.SizeWE;
            ReleaseCapture();
            SendMessage(Handle, WM_NCLBUTTONDOWN, HT_RIGHT, 0);
            formWidth = this.Width;
        }
    }