Source/AdvTree/ColumnHeaderControl.cs

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using System;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using DevComponents.DotNetBar;
using System.Drawing.Drawing2D;
using System.Drawing.Text;

namespace DevComponents.AdvTree
{
    internal class ColumnHeaderControl : Control
    {
        #region Constructor
        /// <summary>
        /// Initializes a new instance of the ColumnHeaderControl class.
        /// </summary>
        public ColumnHeaderControl()
        {
            this.SetStyle(ControlStyles.UserPaint, true);
            this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            this.SetStyle(ControlStyles.Opaque, true);
            this.SetStyle(ControlStyles.ResizeRedraw, true);
            this.SetStyle(ControlStyles.DoubleBuffer, true);
            this.SetStyle(ControlStyles.Selectable, false);
            this.SetStyle(ControlStyles.StandardDoubleClick | ControlStyles.StandardClick, true);
        }
        #endregion

        #region Internal Implementation
        protected override void OnPaint(PaintEventArgs e)
        {
            Graphics g = e.Graphics;

            DisplayHelp.FillRectangle(g, this.ClientRectangle, this.BackColor);

            if (_Columns == null)
            {
                return;
            }

            AdvTree tree = GetTree();
            if (tree != null)
            {
                SmoothingMode sm = g.SmoothingMode;
                TextRenderingHint th = g.TextRenderingHint;
                if (tree.AntiAlias)
                {
                    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
                    g.TextRenderingHint = DisplayHelp.AntiAliasTextRenderingHint;
                }
                //Creates the drawing matrix with the right zoom;
                if (tree.Zoom != 1)
                {
                    System.Drawing.Drawing2D.Matrix mx = GetTranslationMatrix(tree.Zoom);
                    //use it for drawing
                    g.Transform = mx;
                }

                tree.NodeDisplay.PaintColumnHeaders(_Columns, g, true);