How to move and resize a form without a border?

Question

Does anyone know how I can resize a winform when it has no border. I don't want the default border that Windows has, so I changed the property "FormBorderStyle" to "None". This removed the border, although now it can't be resized. I've figured out how to move the form around, I just need to know how to resize it.

Answer 1

Some sample code that allows moving and resizing the form, intentionally not making it pretty. Adjust to your liking:

  public partial class Form1 : Form {
    public Form1() {
      InitializeComponent();
      this.FormBorderStyle = FormBorderStyle.None;
      this.DoubleBuffered = true;
      this.SetStyle(ControlStyles.ResizeRedraw, true);
    }
    private const int cGrip = 16;      // Grip size
    private const int cCaption = 32;   // Caption bar height;

    protected override void OnPaint(PaintEventArgs e) {
      // Paint the grip in lower right corner
      Rectangle rc = new Rectangle(this.ClientSize.Width - cGrip, this.ClientSize.Height - cGrip, cGrip, cGrip);
      ControlPaint.DrawSizeGrip(e.Graphics, this.BackColor, rc);
      // Paint the simulated caption bar
      rc = new Rectangle(0, 0, this.ClientSize.Width, cCaption);
      e.Graphics.FillRectangle(Brushes.DarkBlue, rc);
    }

    protected override void WndProc(ref Message m) {
      if (m.Msg == 0x84) {  // Trap WM_NCHITTEST
        Point pos = new Point(m.LParam.ToInt32());
        pos = this.PointToClient(pos);
        if (pos.Y < cCaption) {
          m.Result = (IntPtr)2;  // HTCAPTION
          return;
        }
        if (pos.X >= this.ClientSize.Width - cGrip && pos.Y >= this.ClientSize.Height - cGrip) {
          m.Result = (IntPtr)17; // HTBOTTOMRIGHT
          return;
        }
      }
      base.WndProc(ref m);
    }
  }

Answer 2

Here's a complete example of a customized form with all 8 points of resizing:

public partial class Form1 : Form {
public Form1() {
  InitializeComponent();
  this.FormBorderStyle = FormBorderStyle.None; // no borders
  this.DoubleBuffered = true;
  this.SetStyle(ControlStyles.ResizeRedraw, true); // this is to avoid visual artifacts
}

protected override void OnPaint(PaintEventArgs e) // you can safely omit this method if you want
{
    e.Graphics.FillRectangle(Brushes.Green, Top);
    e.Graphics.FillRectangle(Brushes.Green, Left);
    e.Graphics.FillRectangle(Brushes.Green, Right);
    e.Graphics.FillRectangle(Brushes.Green, Bottom);
}

private const int
    HTLEFT = 10,
    HTRIGHT = 11,
    HTTOP = 12,
    HTTOPLEFT = 13,
    HTTOPRIGHT = 14,
    HTBOTTOM = 15,
    HTBOTTOMLEFT = 16,
    HTBOTTOMRIGHT = 17;

const int _ = 10; // you can rename this variable if you like

Rectangle Top { get { return new Rectangle(0, 0, this.ClientSize.Width, _); } }
Rectangle Left { get { return new Rectangle(0, 0, _, this.ClientSize.Height); } }
Rectangle Bottom { get { return new Rectangle(0, this.ClientSize.Height - _, this.ClientSize.Width, _); } }
Rectangle Right { get { return new Rectangle(this.ClientSize.Width - _, 0, _, this.ClientSize.Height); } }

Rectangle TopLeft { get { return new Rectangle(0, 0, _, _); } }
Rectangle TopRight { get { return new Rectangle(this.ClientSize.Width - _, 0, _, _); } }
Rectangle BottomLeft { get { return new Rectangle(0, this.ClientSize.Height - _, _, _); } }
Rectangle BottomRight { get { return new Rectangle(this.ClientSize.Width - _, this.ClientSize.Height - _, _, _); } }


protected override void WndProc(ref Message message)
{
    base.WndProc(ref message);

    if (message.Msg == 0x84) // WM_NCHITTEST
    {
        var cursor = this.PointToClient(Cursor.Position);

        if (TopLeft.Contains(cursor)) message.Result = (IntPtr)HTTOPLEFT;
   else if (TopRight.Contains(cursor)) message.Result = (IntPtr)HTTOPRIGHT;
   else if (BottomLeft.Contains(cursor)) message.Result = (IntPtr)HTBOTTOMLEFT;
   else if (BottomRight.Contains(cursor)) message.Result = (IntPtr)HTBOTTOMRIGHT;

   else if (Top.Contains(cursor)) message.Result = (IntPtr)HTTOP;
   else if (Left.Contains(cursor)) message.Result = (IntPtr)HTLEFT;
   else if (Right.Contains(cursor)) message.Result = (IntPtr)HTRIGHT;
   else if (Bottom.Contains(cursor)) message.Result = (IntPtr)HTBOTTOM;
    }
}}

Answer 3

"Sizer" is the light blue panel in the right bottom corner

    int Mx;
    int My;
    int Sw;
    int Sh;

    bool mov;

    void SizerMouseDown(object sender, MouseEventArgs e)
    {
        mov = true;
        My = MousePosition.Y;
        Mx = MousePosition.X;
        Sw = Width;
        Sh = Height;
    }

    void SizerMouseMove(object sender, MouseEventArgs e)
    {
        if (mov == true) {
            Width = MousePosition.X - Mx + Sw;
            Height = MousePosition.Y - My + Sh;
        }
    }

    void SizerMouseUp(object sender, MouseEventArgs e)
    {
        mov = false;
    }

Answer 4

(elaborate : in comment 2)

Resize "Form" From All place And Move it >>> Full Code <<<<<

//First u most to add this Class

 class ReSize
     {

        private bool Above, Right, Under, Left, Right_above, Right_under, Left_under, Left_above;


        int Thickness=6;  //Thickness of border  u can cheang it
        int Area = 8;     //Thickness of Angle border 


        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="thickness">set thickness of form border</param>
        public ReSize(int thickness)
        {
            Thickness = thickness;
        }

        /// <summary>
        /// Constructor set thickness of form border=1
        /// </summary>
        public ReSize()
        {
            Thickness = 10;
        }

        //Get Mouse Position
        public  string getMosuePosition(Point mouse, Form form)
        {
            bool above_underArea = mouse.X > Area && mouse.X < form.ClientRectangle.Width - Area; /* |\AngleArea(Left_Above)\(=======above_underArea========)/AngleArea(Right_Above)/| */ //Area===>(==)
            bool right_left_Area = mouse.Y > Area && mouse.Y < form.ClientRectangle.Height - Area; 

            bool _Above=mouse.Y <= Thickness;  //Mouse in Above All Area
            bool _Right= mouse.X >= form.ClientRectangle.Width - Thickness;
            bool _Under=mouse.Y >= form.ClientRectangle.Height - Thickness;
            bool _Left=mouse.X <= Thickness;

            Above = _Above && (above_underArea); if (Above) return "a";   /*Mouse in Above All Area WithOut Angle Area */
            Right = _Right && (right_left_Area); if (Right) return "r";
            Under = _Under && (above_underArea); if (Under) return "u";
            Left = _Left && (right_left_Area);   if (Left) return "l";


            Right_above =/*Right*/ (_Right && (!right_left_Area)) && /*Above*/ (_Above && (!above_underArea));   if (Right_above) return "ra";     /*if Mouse  Right_above */
            Right_under =/* Right*/((_Right) && (!right_left_Area)) && /*Under*/(_Under && (!above_underArea));  if (Right_under) return "ru";     //if Mouse  Right_under 
            Left_under = /*Left*/((_Left) && (!right_left_Area)) && /*Under*/ (_Under && (!above_underArea));    if (Left_under) return "lu";      //if Mouse  Left_under
            Left_above = /*Left*/((_Left) && (!right_left_Area)) && /*Above*/(_Above && (!above_underArea));     if (Left_above) return "la";      //if Mouse  Left_above

            return "";

        }


    }

Then Form cs

 public partial class FormGDI : Form
    {

        ReSize resize = new ReSize();     // ReSize Class "/\" To Help Resize Form <None Style>


        public FormGDI()
        {
            InitializeComponent();
            this.SetStyle(ControlStyles.ResizeRedraw, true);

        }


        private const int cGrip = 16;      // Grip size
        private const int cCaption = 32;   // Caption bar height;

        protected override void OnPaint(PaintEventArgs e)
        {
            //this if you want to draw   (if)

            Color theColor = Color.FromArgb(10, 20, 20, 20);
            theColor = Color.DarkBlue;
            int BORDER_SIZE = 4;
            ControlPaint.DrawBorder(e.Graphics, ClientRectangle,
                                         theColor, BORDER_SIZE, ButtonBorderStyle.Dashed,
                                         theColor, BORDER_SIZE, ButtonBorderStyle.Dashed,
                                         theColor, BORDER_SIZE, ButtonBorderStyle.Dashed,
                                         theColor, BORDER_SIZE, ButtonBorderStyle.Dashed);


            Rectangle rc = new Rectangle(this.ClientSize.Width - cGrip, this.ClientSize.Height - cGrip, cGrip, cGrip);
            ControlPaint.DrawSizeGrip(e.Graphics, this.BackColor, rc);
            rc = new Rectangle(0, 0, this.ClientSize.Width, cCaption);
            e.Graphics.FillRectangle(Brushes.DarkBlue, rc);



            base.OnPaint(e);
        }


        //set MinimumSize to Form
        public override Size MinimumSize
        {
            get
            {
                return base.MinimumSize;
            }
            set
            {
                base.MinimumSize = new Size(179, 51); 
            }
        }

        //
        //override  WndProc  
        //
        protected override void WndProc(ref Message m)
        {
            //****************************************************************************

            int x = (int)(m.LParam.ToInt64() & 0xFFFF);               //get x mouse position
            int y = (int)((m.LParam.ToInt64() & 0xFFFF0000) >> 16);   //get y mouse position  you can gave (x,y) it from "MouseEventArgs" too
            Point pt = PointToClient(new Point(x, y));

            if (m.Msg == 0x84)
            {
                switch (resize.getMosuePosition(pt, this))
                {
                    case "l": m.Result = (IntPtr)10; return;  // the Mouse on Left Form
                    case "r": m.Result = (IntPtr)11; return;  // the Mouse on Right Form
                    case "a": m.Result = (IntPtr)12; return;
                    case "la": m.Result = (IntPtr)13; return;
                    case "ra": m.Result = (IntPtr)14; return;
                    case "u": m.Result = (IntPtr)15; return;
                    case "lu": m.Result = (IntPtr)16; return;
                    case "ru": m.Result = (IntPtr)17; return; // the Mouse on Right_Under Form
                    case "": m.Result = pt.Y < 32 /*mouse on title Bar*/ ? (IntPtr)2 : (IntPtr)1; return;  

                }
            }

              base.WndProc(ref m);

        }

    }

Answer 5

The simplest way is to assign mouse events to the form or the title bar, whatever you want to be hold for moving. You can move a BorderLess Form with assigning these methods to there events as names in method.

    int movX,movY;
    bool isMoving;

    private void onMouseDown(object sender, MouseEventArgs e)  
    {
         // Assign this method to mouse_Down event of Form or Panel,whatever you want
        isMoving = true;
        movX = e.X;
        movY = e.Y;
    }

    private void onMouseMove(object sender, MouseEventArgs e)
    {
         // Assign this method to Mouse_Move event of that Form or Panel
        if (isMoving)
        {
            this.SetDesktopLocation(MousePosition.X - movX, MousePosition.Y - movY);
        }
    }

    private void onMouseUp(object sender, MouseEventArgs e)
    {
       // Assign this method to Mouse_Up event of Form or Panel.
        isMoving = false;
    }

Answer 6

If you don't mind a short bar at the top, you can use a "regular" sizable form with the .ControlBox set to false and .Text (the caption bar at the top) set to an empty string.

You'll end up with a resizable form that looks like the Task Manager when you double-click on a chart. The advantage of this method is that when you resize it from the left, the right border does not jerk. The same is also when you resize it from the top.

this.FormBorderStyle = FormBorderStyle.Sizable;
this.ControlBox = false;
this.Text = "";

Answer 7

(1) FormBorderStyle= Sizable or SizableToolWindows

(2) clear text in form text