Question

I have the following code under a TabConttrols DrawItem event that I am trying to extract into a class file. I am having trouble since it is tied to an event. Any hints or pointers would be greatly appreciated.

        private void tabCaseNotes_DrawItem(object sender, DrawItemEventArgs e)     {         TabPage currentTab = tabCaseNotes.TabPages[e.Index];         Rectangle itemRect = tabCaseNotes.GetTabRect(e.Index);         SolidBrush fillBrush = new SolidBrush(Color.Linen);         SolidBrush textBrush = new SolidBrush(Color.Black);         StringFormat sf = new StringFormat                               {                                   Alignment = StringAlignment.Center,                                   LineAlignment = StringAlignment.Center                               };          //If we are currently painting the Selected TabItem we'll         //change the brush colors and inflate the rectangle.         if (System.Convert.ToBoolean(e.State & DrawItemState.Selected))         {             fillBrush.Color = Color.LightSteelBlue;             textBrush.Color = Color.Black;             itemRect.Inflate(2, 2);         }          //Set up rotation for left and right aligned tabs         if (tabCaseNotes.Alignment == TabAlignment.Left || tabCaseNotes.Alignment == TabAlignment.Right)         {             float rotateAngle = 90;             if (tabCaseNotes.Alignment == TabAlignment.Left)                 rotateAngle = 270;             PointF cp = new PointF(itemRect.Left + (itemRect.Width / 2), itemRect.Top + (itemRect.Height / 2));             e.Graphics.TranslateTransform(cp.X, cp.Y);             e.Graphics.RotateTransform(rotateAngle);             itemRect = new Rectangle(-(itemRect.Height / 2), -(itemRect.Width / 2), itemRect.Height, itemRect.Width);         }          //Next we'll paint the TabItem with our Fill Brush         e.Graphics.FillRectangle(fillBrush, itemRect);          //Now draw the text.         e.Graphics.DrawString(currentTab.Text, e.Font, textBrush, (RectangleF)itemRect, sf);          //Reset any Graphics rotation         e.Graphics.ResetTransform();          //Finally, we should Dispose of our brushes.         fillBrush.Dispose();         textBrush.Dispose();     } 

Answer 1

Depends on what you’re trying to achieve. You could always sub class TabControl or you could encapsulate the drawing code in a class that you pass a TabControl to.

public class TabRenderer {     private TabControl _tabControl;      public TabRenderer(TabControl tabControl)     {         _tabControl = tabControl;         _tabControl.DrawMode = TabDrawMode.OwnerDrawFixed;         _tabControl.DrawItem += TabControlDrawItem;     }      private void TabControlDrawItem(object sender, DrawItemEventArgs e)     {         // Your drawing code...     } }