Advanced ListBox

• Download source files - 15 Kb
• Download demo project - 13 Kb

Introduction

Some Times you may need a list box with Header and able to Move in Runtime by User Click!
In this Article we design a List Box with Header , Disposable and movable , ...

Background

    public class tblListBox : Panel
    {
        private System.Windows.Forms.CheckedListBox listBox1;
        // Class Detail...

    }

For Movable , Disposable , Header Text, Header Color feature we need some private variable

        bool     isDrag = false;            // For Movable feature

        long     _tblID;                // for table ID

        string     _hText;                // For Header text

        Color     _HeaderColor = Color.Blue;    // For Header Back Color

        bool     _Disposable = false;        // For Disposable feature

        bool     _Movable = false;        // For Movable feature

Constructor:

        public tblListBox(long TableID)
        {
            InitializeComponent();
            _tblID = TableID;
            listBox1.Size = new Size(this.Size.Width, this.Size.Height - 30);
            listBox1.Top = 30;
            this.Controls.Add(listBox1);
            this.MouseMove += new MouseEventHandler(ListMouseMove);
            this.MouseDown += new MouseEventHandler(ListMouseDown);
            this.MouseUp += new MouseEventHandler(ListMouseUp);
            this.DoubleClick += new EventHandler(tblListBox_DoubleClick);
        }

Implementing Class:

        public int SelectedIndex
        {
            get { return listBox1.SelectedIndex; }
        }
        public bool Disposable
        {
            get { return _Disposable; }
            set { _Disposable = value; }
        }
        public bool Movable
        {
            get { return _Movable; }
            set { _Movable = value; }
        }
        
        public string HeaderText
        {
            get { return _hText; }
            set { _hText = value; }
        }
        public long TableID
        {
            get { return _tblID; }
        }
        public Color HeaderColor
        {
            get { return _HeaderColor; }
            set { _HeaderColor = value; }
        }

Now Implementing two property of ListBox: Items, GetItemChecked(int)

        public bool GetItemChecked(int index)
        {
            return listBox1.GetItemChecked(index);
        }
        
        public System.Windows.Forms.ListBox.ObjectCollection Items
        {
            get { return listBox1.Items; }
        }

Now We Need when Panel Resized The ListBox Resized too and Paint New Feature!:

        protected override void OnResize(EventArgs eventargs)
        {
            listBox1.Size = new Size(this.Size.Width, this.Size.Height - 30);
        }
        protected override void OnPaint(PaintEventArgs e)
        {
            
            Brush b=new SolidBrush(_HeaderColor);
            // Paint orginall

            base.OnPaint(e);
            // Draw background and fill with _HeaderColor

            e.Graphics.FillRectangle(b, e.ClipRectangle);
            // Determine size of string

            SizeF strSize=e.Graphics.MeasureString(_hText,new Font("Tahoma",8,FontStyle.Bold));
            // Align Center

            float left = e.ClipRectangle.Width/2 - strSize.Width / 2;
            // Draw string on Center of Header

            e.Graphics.DrawString(_hText, new Font("Tahoma", 8, FontStyle.Bold), System.Drawing.Brushes.Yellow, new PointF(left, 10));
        }

Implementing Movable Feature:

        void ListMouseMove(object sender, MouseEventArgs e)
        {
            if (!_Movable) return;
            tblListBox list = (tblListBox)sender;
            if (isDrag)
            {              
                Point endPoint = this.PointToScreen(new Point(e.X - this.Parent.Location.X-100, e.Y - this.Parent.Location.Y-100));
                list.Location = endPoint;
            }
        }
        void ListMouseUp(object sender, MouseEventArgs e)
        {
            if (!_Movable) return;
            isDrag = false;
        }
        void ListMouseDown(object sender, MouseEventArgs e)
        {
            if (!_Movable) return;
            if (e.Button == MouseButtons.Left)
            {
                isDrag = true;
            }
            Control control = (Control)sender;
        }        

Properties:

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here