Csharp/C Sharp by API/System.Windows.Forms/MeasureItemEventArgs

MeasureItemEventArgs.ItemWidth

 
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
   
class HatchBrushMenu: Form
{
     HatchStyleMenuItem hsmiChecked;
     const int iMin = 0, iMax = 52;
     public static void Main()
     {
          Application.Run(new HatchBrushMenu());
     }
     public HatchBrushMenu()
     {
          ResizeRedraw = true;
   
          Menu = new MainMenu();
          Menu.MenuItems.Add("&Hatch-Style");
   
          for (HatchStyle hs = (HatchStyle)iMin; hs <= (HatchStyle)iMax;hs++)
          {
               HatchStyleMenuItem hsmi = new HatchStyleMenuItem();
   
               hsmi.HatchStyle = hs;
               hsmi.Click += new EventHandler(MenuHatchStyleOnClick);
   
               if ((int)hs % 8 == 0)
                    hsmi.BarBreak = true;
   
               Menu.MenuItems[0].MenuItems.Add(hsmi);
          }
          hsmiChecked = (HatchStyleMenuItem) Menu.MenuItems[0].MenuItems[0];
          hsmiChecked.Checked = true;
     }
     void MenuHatchStyleOnClick(object obj, EventArgs ea)
     {
          hsmiChecked.Checked = false;
          hsmiChecked = (HatchStyleMenuItem) obj;
          hsmiChecked.Checked = true;
   
          Invalidate();
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics grfx = pea.Graphics;
   
          HatchBrush hbrush = new HatchBrush(hsmiChecked.HatchStyle,
                                             Color.White, Color.Black);
   
          grfx.FillEllipse(hbrush, ClientRectangle);
     }
}
class HatchStyleMenuItem: MenuItem
{
     const    int cxImage = 32, cyImage = 32, iMargin = 2;
     readonly int cxCheck, cyCheck; 
   
     public HatchStyle HatchStyle;
   
     public HatchStyleMenuItem()
     {
          OwnerDraw = true;
   
          cxCheck = SystemInformation.MenuCheckSize.Width;
          cyCheck = SystemInformation.MenuCheckSize.Height;
     }
     protected override void OnMeasureItem(MeasureItemEventArgs miea)
     {
          miea.ItemWidth  = 2 * cxImage + 3 * iMargin - cxCheck;
          miea.ItemHeight =     cyImage + 2 * iMargin;
     }
     protected override void OnDrawItem(DrawItemEventArgs diea)
     {
          diea.DrawBackground();
   
          if ((diea.State & DrawItemState.Checked) != 0)
          {
                ControlPaint.DrawMenuGlyph(diea.Graphics,
                                   diea.Bounds.Location.X + iMargin, 
                                   diea.Bounds.Location.Y + iMargin,
                                   cxImage, cyImage, MenuGlyph.Checkmark);
          }
          HatchBrush hbrush = new HatchBrush(HatchStyle,
                                             Color.White, Color.Black);
   
          diea.Graphics.FillRectangle(hbrush, 
                              diea.Bounds.X + 2 * iMargin + cxImage,
                              diea.Bounds.Y + iMargin, cxImage, cyImage);
     }
}