■ ListBox 클래스의 OnDrawItem 메소드를 사용해 리스트 박스 항목을 그리는 방법을 보여준다.
▶ BrushListBox.cs
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using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Windows.Forms; namespace TestProject { /// <summary> /// 브러시 리스트 박스 /// </summary> public class BrushListBox : ListBox { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 브러시 타입 /// </summary> private BrushType brushType; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 브러시 타입 - BrushType /// <summary> /// 브러시 타입 /// </summary> public BrushType BrushType { get { return this.brushType; } set { this.brushType = value; Initialize(); } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - BrushListBox() /// <summary> /// 생성자 /// </summary> public BrushListBox() { DrawMode = DrawMode.OwnerDrawFixed; BrushType = BrushType.HATCH; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Protected #region 항목 그리기시 처리하기 - OnDrawItem(e) /// <summary> /// 항목 그리기시 처리하기 /// </summary> /// <param name="e">이벤트 인자</param> protected override void OnDrawItem(DrawItemEventArgs e) { Graphics graphics = e.Graphics; e.DrawBackground(); if(e.Index >= 0 && e.Index < Items.Count) { IBrushItem brushItem = (IBrushItem)Items[e.Index]; Brush brush = brushItem.Brush; graphics.FillRectangle(brush, e.Bounds); graphics.DrawLine(Pens.Black, e.Bounds.X, e.Bounds.Bottom - 1, e.Bounds.Right, e.Bounds.Bottom - 1); string brushItemName = brushItem.Name; int width = (int)graphics.MeasureString(brushItemName, Font).Width; graphics.FillRectangle ( (e.State & DrawItemState.Selected) == DrawItemState.Selected ? Brushes.Yellow : Brushes.White, 3, e.Bounds.Top + 3, width + 3, Font.Height + 5 ); graphics.DrawRectangle(Pens.Black, 3, e.Bounds.Top + 3, width + 3, Font.Height + 5); graphics.DrawString(brushItem.Name, Font, Brushes.Black, 5, e.Bounds.Top + 5); brush.Dispose(); } } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Private #region 초기화하기 - Initialize() /// <summary> /// 초기화하기 /// </summary> private void Initialize() { Items.Clear(); if(this.brushType == BrushType.HATCH) { foreach(HatchStyle hatchStyle in Enum.GetValues(typeof(HatchStyle))) { IBrushItem brushItem = new HatchBrushItem(hatchStyle, Color.Blue, Color.Transparent); Items.Add(brushItem); } } else if(this.brushType == BrushType.SOLID_COLOR) { foreach(KnownColor knownColor in Enum.GetValues(typeof(KnownColor))) { Color color = Color.FromKnownColor(knownColor); if(!color.IsSystemColor) { IBrushItem brushItem = new ColorBrushItem(color); Items.Add(brushItem); } } } else if(this.brushType == BrushType.SYSTEM_COLOR) { foreach(KnownColor knownColor in Enum.GetValues(typeof(KnownColor))) { Color color = Color.FromKnownColor(knownColor); if(color.IsSystemColor) { IBrushItem brushItem = new ColorBrushItem(color); Items.Add(brushItem); } } } } #endregion } } |
