Change WinForm border style?

Question

Is it possible to change the border style of WinForm? I know that if the border is removed, it removes the functionality for resizing the program. So is there a way to change his style, but keep it volatile?

Answer 1

What you are looking for is not easy, because the border is displayed by the operating system. However, CodePlex has a library that makes this possible.

Drawing custom borders in Windows formats

Answer 2

First write this in 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);

, . , :

    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;
        }
    }

Answer 3

, .

But you can set the shape frame style to None. And implement resizing in your form (which I don’t think is complicated)

Answer 4

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;
}

PS: have not tested it yet

We hope you set FormBorderStyle to None