■ UserControl 클래스를 사용해 가상 리스트 박스를 만드는 방법을 보여준다.
▶ VirtualListBox.cs
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using System; using System.Collections.ObjectModel; using System.Collections.Specialized; using System.ComponentModel; using System.Diagnostics; using System.Drawing; using System.Windows.Forms; namespace TestProject { /// <summary> /// 가상 리스트 박스 /// </summary> public class VirtualListBox : UserControl { //////////////////////////////////////////////////////////////////////////////////////////////////// Event ////////////////////////////////////////////////////////////////////////////////////////// Public #region 마지막 렌더링 시간 변경시 - LastRenderTimeChanged /// <summary> /// 마지막 렌더링 시간 변경시 /// </summary> public event EventHandler LastRenderTimeChanged; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 현재 항목 인덱스 /// </summary> private int currentItemIndex; /// <summary> /// 버퍼 그래픽스 /// </summary> private BufferedGraphics bufferedGraphics; /// <summary> /// 버퍼 그래픽스 컨텍스트 /// </summary> private BufferedGraphicsContext bufferedGraphicsContext; /// <summary> /// 항목 컬렉션 /// </summary> private ObservableCollection<string> itemCollection; /// <summary> /// 항목 높이 /// </summary> private int itemHeight; /// <summary> /// 마지막 렌더링 시간 /// </summary> private long lastRenderTime; /// <summary> /// 페인팅 여부 /// </summary> private volatile bool painting; /// <summary> /// 보류 여부 /// </summary> private volatile bool suspended; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 항목 컬렉션 - ItemCollection /// <summary> /// 항목 컬렉션 /// </summary> [Browsable(false)] public ObservableCollection<string> ItemCollection { get { return this.itemCollection; } } #endregion #region 항목 높이 - ItemHeight /// <summary> /// 항목 높이 /// </summary> [Category("VirtualListBox")] [Browsable(true)] [DefaultValue(18)] [Description("목록에서 항목 높이 입니다.")] public int ItemHeight { get { return this.itemHeight; } set { if(this.itemHeight != value) { this.itemHeight = value; InvalidateBuffer(); } } } #endregion #region 마지막 렌더링 시간 - LastRenderTime /// <summary> /// 마지막 렌더링 시간 /// </summary> [Browsable(false)] public long LastRenderTime { get { return this.lastRenderTime; } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - VirtualListBox() /// <summary> /// 생성자 /// </summary> public VirtualListBox() { DoubleBuffered = true; SetStyle ( ControlStyles.AllPaintingInWmPaint | ControlStyles.Opaque | ControlStyles.OptimizedDoubleBuffer | ControlStyles.UserPaint, true ); this.currentItemIndex = -1; this.bufferedGraphics = null; this.bufferedGraphicsContext = BufferedGraphicsManager.Current; this.itemCollection = new ObservableCollection<string>(); this.itemHeight = 18; this.lastRenderTime = 0; this.painting = false; this.suspended = false; this.itemCollection.CollectionChanged += itemCollection_CollectionChanged; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 업데이트 시작하기 - BeginUpdate() /// <summary> /// 업데이트 시작하기 /// </summary> public void BeginUpdate() { this.suspended = true; } #endregion #region 업데이트 종료하기 - EndUpdate() /// <summary> /// 업데이트 종료하기 /// </summary> public void EndUpdate() { this.suspended = false; InvalidateBuffer(); } #endregion #region 항목 인덱스 구하기 - GetItemIndex(point) /// <summary> /// 항목 인덱스 구하기 /// </summary> /// <param name="point">위치</param> /// <returns>항목 인덱스</returns> public int GetItemIndex(Point point) { int start = itemHeight > 0 ? (int)Math.Floor((double)Math.Abs(AutoScrollPosition.Y) / itemHeight) : 0; int visibleItemCount = (int)Math.Ceiling((double)Height / (double)itemHeight); Rectangle boundRectangle = new Rectangle(0, -(int)(Math.Abs(AutoScrollPosition.Y) % itemHeight), Width, itemHeight); for(int i = 0; 0 <= start + i && start + i < itemCollection.Count && visibleItemCount > i; i++) { if(boundRectangle.Contains(point)) { return start + i; } boundRectangle.Y += itemHeight; } return -1; } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Protected #region 크기 조정시 처리하기 - OnResize(e) /// <summary> /// 크기 조정시 처리하기 /// </summary> /// <param name="e">이벤트 인자</param> protected override void OnResize(EventArgs e) { base.OnResize(e); InvalidateBuffer(); } #endregion #region 마우스 이동시 처리하기 - OnMouseMove(e) /// <summary> /// 마우스 이동시 처리하기 /// </summary> /// <param name="e">이벤트 인자</param> protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); int index = GetItemIndex(e.Location); if(index != currentItemIndex) { currentItemIndex = index; InvalidateBuffer(); } } #endregion #region 마우스 휠 처리하기 - OnMouseWheel(e) /// <summary> /// 마우스 휠 처리하기 /// </summary> /// <param name="e">이벤트 인자</param> protected override void OnMouseWheel(MouseEventArgs e) { base.OnMouseWheel(e); InvalidateBuffer(); } #endregion #region 스크롤시 처리하기 - OnScroll(e) /// <summary> /// 스크롤시 처리하기 /// </summary> /// <param name="e">이벤트 인자</param> protected override void OnScroll(ScrollEventArgs e) { base.OnScroll(e); InvalidateBuffer(); } #endregion #region 페인트시 처리하기 - OnPaint(e) /// <summary> /// 페인트시 처리하기 /// </summary> /// <param name="e">이벤트 인자</param> protected override void OnPaint(PaintEventArgs e) { Stopwatch stopwatch = Stopwatch.StartNew(); if(this.bufferedGraphics == null) { Rectangle boundRectangle = new Rectangle(0, 0, Width, Height); this.bufferedGraphics = this.bufferedGraphicsContext.Allocate(e.Graphics, boundRectangle); using(Brush brush = new SolidBrush(BackColor)) { this.bufferedGraphics.Graphics.FillRectangle(brush, boundRectangle); brush.Dispose(); } if(itemCollection.Count > 0 && itemHeight > 0) { int start = 0; if(itemHeight > 0) { start = (int)Math.Floor((double)Math.Abs(AutoScrollPosition.Y) / itemHeight); } StringFormat stringFormat = new StringFormat() { Alignment = StringAlignment.Near, LineAlignment = StringAlignment.Center }; int visibleItemCount = (int)Math.Ceiling((double)Height / (double)itemHeight); int offset = -(int)(Math.Abs(AutoScrollPosition.Y) % itemHeight); for(int i = 0; visibleItemCount > i && itemCollection.Count > start + i && 0 <= start + i; i++) { Brush foregroundBrush = (currentItemIndex == start + i) ? Brushes.White : Brushes.Black; Rectangle itemBoundRectangle = new Rectangle(0, i * itemHeight + offset, Width, itemHeight); if(currentItemIndex == start + i) { using(Brush brush = new SolidBrush(Color.FromArgb(50, 142, 254))) { bufferedGraphics.Graphics.FillRectangle(brush, itemBoundRectangle); brush.Dispose(); } } itemBoundRectangle.X += 10; itemBoundRectangle.Width -= 20; bufferedGraphics.Graphics.DrawString ( itemCollection[start + i], Font, foregroundBrush, itemBoundRectangle, stringFormat ); } } } this.bufferedGraphics.Render(e.Graphics); stopwatch.Stop(); this.lastRenderTime = stopwatch.ElapsedMilliseconds; if(LastRenderTimeChanged != null) { LastRenderTimeChanged.Invoke(this, EventArgs.Empty); } } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Private #region 항목 컬렉션 컬렉션 변경시 처리하기 - itemCollection_CollectionChanged(sender, e) /// <summary> /// 항목 컬렉션 컬렉션 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void itemCollection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { InvalidateBuffer(); } #endregion #region 버퍼 무효화 하기 - InvalidateBuffer() /// <summary> /// 버퍼 무효화 하기 /// </summary> private void InvalidateBuffer() { if(this.painting || this.suspended) { return; } this.painting = true; if(this.bufferedGraphics != null) { this.bufferedGraphics.Dispose(); this.bufferedGraphics = null; } AutoScrollMinSize = new Size(0, ItemHeight * itemCollection.Count); Invalidate(); this.painting = false; } #endregion } } |
▶ MainForm.cs
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using System; using System.Drawing; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); #region 가상 리스트 박스를 설정한다. this.virtualListBox.BackColor = Color.White; this.virtualListBox.LastRenderTimeChanged += (s, e) => this.timeLabel.Invoke ( (MethodInvoker)delegate { this.timeLabel.Text = "렌더링 시간 : " + this.virtualListBox.LastRenderTime + "밀리초"; } ); this.virtualListBox.BeginUpdate(); for(int i = 0; 1000000 > i; i++) { this.virtualListBox.ItemCollection.Add(string.Format("가상 리스트 박스 항목 {0}", i + 1)); } this.virtualListBox.EndUpdate(); #endregion this.addButton.Click += addButton_Click; this.itemHeightNumericUpDown.ValueChanged += itemHeightNumericUpDown_ValueChanged; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 추가 버튼 클릭시 처리하기 - addButton_Click(sender, e) /// <summary> /// 추가 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void addButton_Click(object sender, EventArgs e) { Random random = new Random(); this.virtualListBox.BeginUpdate(); for(int i = 0; 100000 > i; i++) { this.virtualListBox.ItemCollection.Add(string.Format("추가 가상 리스트 박스 항목 {0}", random.Next(10000000, 99999999))); } this.virtualListBox.EndUpdate(); } #endregion #region 항목 높이 숫자 UP/DOWN 값 변경시 처리하기 - itemHeightNumericUpDown_ValueChanged(sender, e) /// <summary> /// 항목 높이 숫자 UP/DOWN 값 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void itemHeightNumericUpDown_ValueChanged(object sender, EventArgs e) { this.virtualListBox.ItemHeight = (int)this.itemHeightNumericUpDown.Value; } #endregion } } |
