WinForm Title Bar 없이 폼이동

MouseDown, MouseMove, MouseUp 이벤트를 이용하여 폼이동을 처리 한다.

MouseDown 시점에 Control.MousePosition 값과 MouseMove 시점 Control.MousePosition 값의 차이 만큼 폼을 이동 한다..

샘플은 폼 또는 Label 을 마우스로 이동하여 폼을 이동 한다.

Sample Form

기능 구현.

public static class FormHelper
{
    public static void SetMovingForm(this Form form, Control[] triggerControls, Cursor movingCursorOrNull = null)
    {
        bool mouseDown = false;
        Point lastMousePoint = new Point();
        Cursor movingCursor;

        if (movingCursorOrNull == null)
            movingCursor = Cursors.NoMove2D;
        else
            movingCursor = movingCursorOrNull;

        Dictionary<Control, Cursor> oldCursors = new Dictionary<Control, Cursor>();

        foreach (var item in triggerControls)
        {
            Control con = item;

            con.MouseDown += (s, e) =>
            {
                var thisControl = s as Control;

                mouseDown = true;

                if (!oldCursors.ContainsKey(item))
                    oldCursors.Add(item, thisControl.Cursor);
                else
                    oldCursors[item] = thisControl.Cursor;

                thisControl.Cursor = movingCursor;

                lastMousePoint = Control.MousePosition;
            };                

            con.MouseMove += (s, e) =>
            {
                if (!mouseDown)
                    return;

                Point currentPoint = Control.MousePosition;

                int x = currentPoint.X - lastMousePoint.X;
                int y = currentPoint.Y - lastMousePoint.Y;

                form.Location = new Point(form.Location.X + x, form.Location.Y + y);

                lastMousePoint = currentPoint;
            };

            con.MouseUp += (s, e) =>
            {
                var thisControl = s as Control;

                mouseDown = false;
                thisControl.Cursor = oldCursors[thisControl];
            };
        }
    }
}

사용예.

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        this.FormBorderStyle = FormBorderStyle.None;

        this.SetMovingForm(new Control[] { this, this.titleLabel });
    }
}