■ UserControl 클래스를 사용해 대용량 이미지 갤러리를 만드는 방법을 보여준다.
▶ GalleryItem.cs
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using System.Drawing; namespace TestProject { /// <summary> /// 갤러리 항목 /// </summary> public class GalleryItem { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Public #region Field /// <summary> /// 이미지 /// </summary> public Image Image; #endregion } } |
▶ GalleryHelper.cs
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using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Text; namespace TestProject { /// <summary> /// 갤러리 헬퍼 /// </summary> public static class GalleryHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 썸네일 비트맵 구하기 - GetThumbnailBitmap(sourceBitmap, targetWidth, targetHeight) /// <summary> /// 썸네일 비트맵 구하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="targetWidth">타겟 너비</param> /// <param name="targetHeight">타겟 높이</param> /// <returns>썸네일 비트맵</returns> public static Bitmap GetThumbnailBitmap(Bitmap sourceBitmap, int targetWidth, int targetHeight) { Bitmap bitmap = new Bitmap(targetWidth, targetHeight); using(Graphics graphics = Graphics.FromImage(bitmap)) { graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; graphics.CompositingQuality = CompositingQuality.HighQuality; graphics.SmoothingMode = SmoothingMode.HighQuality; graphics.TextRenderingHint = TextRenderingHint.AntiAlias; graphics.PixelOffsetMode = PixelOffsetMode.HighQuality; graphics.Clear(Color.Transparent); int width; int height; if(sourceBitmap.Width < targetWidth && sourceBitmap.Height < targetHeight) { width = sourceBitmap.Width; height = sourceBitmap.Height; } else { if(sourceBitmap.Width > sourceBitmap.Height) { width = targetWidth; height = Convert.ToInt32(targetHeight * Convert.ToDouble(sourceBitmap.Height) / sourceBitmap.Width); } else { width = Convert.ToInt32(targetWidth * Convert.ToDouble(sourceBitmap.Width) / sourceBitmap.Height); height = targetHeight; } } int left = (targetWidth - width ) / 2; int top = (targetHeight - height) / 2; graphics.DrawImage(sourceBitmap, left, top, width, height); } return bitmap; } #endregion #region 썸네일 비트맵 구하기 - GetThumbnailBitmap(filePath) /// <summary> /// 썸네일 비트맵 구하기 /// </summary> /// <param name="filePath">파일 경로</param> /// <returns>썸네일 비트맵</returns> public static Bitmap GetThumbnailBitmap(string filePath) { using(Bitmap sourceBitmap = new Bitmap(filePath)) { Bitmap thumbnailBitmap = GetThumbnailBitmap(sourceBitmap, 200, 200); return thumbnailBitmap; } } #endregion #region 행 인덱스 구하기 - GetRowIndex(columnCount, sequenceIndex) /// <summary> /// 행 인덱스 구하기 /// </summary> /// <param name="columnCount">컬럼 수</param> /// <param name="sequenceIndex">순번 인덱스</param> /// <returns>행 인덱스</returns> public static int GetRowIndex(int columnCount, int sequenceIndex) { return sequenceIndex / columnCount; } #endregion #region 컬럼 인덱스 구하기 - GetColumnIndex(columnCount, sequenceIndex) /// <summary> /// 컬럼 인덱스 구하기 /// </summary> /// <param name="columnCount">컬럼 수</param> /// <param name="sequenceIndex">순번 인덱스</param> /// <returns>컬럼 인덱스</returns> public static int GetColumnIndex(int columnCount, int sequenceIndex) { return sequenceIndex % columnCount; } #endregion #region 순번 인덱스 구하기 - GetSequenceIndex(columnCount, rowIndex, columnIndex) /// <summary> /// 순번 인덱스 구하기 /// </summary> /// <param name="columnCount">컬럼 수</param> /// <param name="rowIndex">행 인덱스</param> /// <param name="columnIndex">컬럼 인덱스</param> /// <returns>순번 인덱스</returns> public static int GetSequenceIndex(int columnCount, int rowIndex, int columnIndex) { return columnCount * rowIndex + columnIndex; } #endregion #region 항목 그리기 - DrawItem(graphics, x, y, width, height, item) /// <summary> /// 항목 그리기 /// </summary> /// <param name="graphics">그래픽스</param> /// <param name="x">X</param> /// <param name="y">Y</param> /// <param name="width">너비</param> /// <param name="height">높이</param> /// <param name="item">갤러리 항목</param> public static void DrawItem(Graphics graphics, int x, int y, int width, int height, GalleryItem item) { graphics.DrawRectangle(Pens.Black, x + 1, y + 1, width - 2, height - 2); if(item.Image != null) { graphics.DrawImage(item.Image, new Rectangle(x + 2, y + 2, width - 4, height - 4)); } } #endregion } } |
▶ GalleryControl.cs
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using System; using System.Collections.Generic; using System.Drawing; using System.Windows.Forms; namespace TestProject { /// <summary> /// 갤러리 컨트롤 /// </summary> public partial class GalleryControl : UserControl { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 뷰포트 너비 /// </summary> private int viewportWidth; /// <summary> /// 뷰포트 높이 /// </summary> private int viewportHeight; /// <summary> /// 항목 너비 /// </summary> private int itemWidth = 200; /// <summary> /// 항목 높이 /// </summary> private int itemHeight = 200; /// <summary> /// 항목 리스트 /// </summary> private List<GalleryItem> itemList = null; /// <summary> /// 항목 수 /// </summary> private int itemCount; /// <summary> /// 뷰포트 항목 X 수 /// </summary> private int viewportItemXCount; /// <summary> /// 뷰포트 항목 Y 수 /// </summary> private int viewportItemYCount; /// <summary> /// 뷰포트 항목 수 /// </summary> private int viewportItemCount; /// <summary> /// 스크롤바 너비 /// </summary> private int scrollBarWidth = 18; /// <summary> /// 컨텐트 너비 /// </summary> private int contentWidth; /// <summary> /// 컨텐트 높이 /// </summary> private int contentHeight; /// <summary> /// 스크롤 Y /// </summary> private int scrollY = 0; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 뷰포트 너비 - ViewportWidth /// <summary> /// 뷰포트 너비 /// </summary> public int ViewportWidth { get { return this.viewportWidth; } } #endregion #region 뷰포트 높이 - ViewportHeight /// <summary> /// 뷰포트 높이 /// </summary> public int ViewportHeight { get { return this.viewportHeight; } } #endregion #region 항목 너비 - ItemWidth /// <summary> /// 항목 너비 /// </summary> public int ItemWidth { get { return this.itemWidth; } set { if(this.itemWidth == value) { return; } this.itemWidth = value; Calculate(); } } #endregion #region 항목 높이 - ItemHeight /// <summary> /// 항목 높이 /// </summary> public int ItemHeight { get { return this.itemHeight; } set { if(this.itemHeight == value) { return; } this.itemHeight = value; Calculate(); } } #endregion #region 항목 리스트 - ItemList /// <summary> /// 항목 리스트 /// </summary> public List<GalleryItem> ItemList { get { return this.itemList; } set { if(this.itemList == value) { return; } this.itemList = value; Calculate(); } } #endregion #region 항목 수 - ItemCount /// <summary> /// 항목 수 /// </summary> public int ItemCount { get { return this.itemCount; } } #endregion #region 뷰포트 항목 X 수 - ViewportItemXCount /// <summary> /// 뷰포트 항목 X 수 /// </summary> public int ViewportItemXCount { get { return this.viewportItemXCount; } } #endregion #region 뷰포트 항목 Y 수 - ViewportItemYCount /// <summary> /// 뷰포트 항목 Y 수 /// </summary> public int ViewportItemYCount { get { return this.viewportItemYCount; } } #endregion #region 뷰포트 항목 수 - ViewportItemCount /// <summary> /// 뷰포트 항목 수 /// </summary> public int ViewportItemCount { get { return this.viewportItemCount; } } #endregion #region 스크롤바 너비 - ScrollBarWidth /// <summary> /// 스크롤바 너비 /// </summary> public int ScrollBarWidth { get { return this.scrollBarWidth; } set { if(this.scrollBarWidth == value) { return; } this.scrollBarWidth = value; this.vScrollBar.Width = this.scrollBarWidth - 1; Calculate(); } } #endregion #region 컨텐트 너비 - ContentWidth /// <summary> /// 컨텐트 너비 /// </summary> public int ContentWidth { get { return this.contentWidth; } } #endregion #region 컨텐트 높이 - ContentHeight /// <summary> /// 컨텐트 높이 /// </summary> public int ContentHeight { get { return this.contentHeight; } } #endregion #region 스크롤 Y - ScrollY /// <summary> /// 스크롤 Y /// </summary> public int ScrollY { get { return this.scrollY; } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - GalleryControl() /// <summary> /// 생성자 /// </summary> public GalleryControl() { InitializeComponent(); SetStyle(ControlStyles.DoubleBuffer , true); SetStyle(ControlStyles.AllPaintingInWmPaint, true); SetStyle(ControlStyles.UserPaint , true); this.vScrollBar.Width = this.scrollBarWidth - 1; this.vScrollBar.Visible = false; SizeChanged += UserControl_SizeChanged; Paint += UserControl_Paint; MouseWheel += UserControl_MouseWheel; this.vScrollBar.ValueChanged += vScrollBar_ValueChanged; this.vScrollBar.MouseWheel += vScrollBar_MouseWheel; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 사용자 컨트롤 크기 변경시 처리하기 - UserControl_SizeChanged(sender, e) /// <summary> /// 사용자 컨트롤 크기 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void UserControl_SizeChanged(object sender, EventArgs e) { Calculate(); } #endregion #region 사용자 컨트롤 페인트시 처리하기 - UserControl_Paint(sender, e) /// <summary> /// 사용자 컨트롤 페인트시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void UserControl_Paint(object sender, PaintEventArgs e) { Graphics graphics = e.Graphics; graphics.Clear(Color.White); if(this.itemCount > 0 && this.viewportItemCount > 0) { int viewportStartY = this.scrollY; int viewportEndY = this.scrollY + this.viewportHeight; int itemStartRowIndex = viewportStartY / this.itemHeight; int itemEndRowIndex = viewportEndY / this.itemHeight; for(int y = itemStartRowIndex; y <= itemEndRowIndex; y++) { for(int x = 0; x < this.viewportItemXCount; x++) { int sequenceIndex = GalleryHelper.GetSequenceIndex(this.viewportItemXCount, y, x); if(sequenceIndex > this.itemList.Count - 1) { continue; } GalleryItem item = this.itemList[sequenceIndex]; int itemX = x * this.itemWidth; int itemY = y * this.itemHeight - this.scrollY; GalleryHelper.DrawItem(graphics, itemX, itemY, this.itemWidth, this.itemHeight, item); } } } } #endregion #region 사용자 컨트롤 마우스 휠 처리하기 - UserControl_MouseWheel(sender, e) /// <summary> /// 사용자 컨트롤 마우스 휠 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void UserControl_MouseWheel(object sender, MouseEventArgs e) { if(this.vScrollBar.Visible) { this.vScrollBar.Value = Math.Max(this.vScrollBar.Minimum, Math.Min(this.vScrollBar.Maximum, this.vScrollBar.Value - e.Delta)); } } #endregion #region 수직 스크롤바 값 변경시 처리하기 - vScrollBar_ValueChanged(sender, e) /// <summary> /// 수직 스크롤바 값 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void vScrollBar_ValueChanged(object sender, EventArgs e) { this.scrollY = this.vScrollBar.Value; Invalidate(); } #endregion #region 수직 스크롤바 마우스 휠 처리하기 - vScrollBar_MouseWheel(sender, e) /// <summary> /// 수직 스크롤바 마우스 휠 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void vScrollBar_MouseWheel(object sender, MouseEventArgs e) { this.vScrollBar.Value = Math.Max(this.vScrollBar.Minimum, Math.Min(this.vScrollBar.Maximum, this.vScrollBar.Value - e.Delta)); } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 스크롤바 설정하기 - SetScrollBar() /// <summary> /// 스크롤바 설정하기 /// </summary> private void SetScrollBar() { this.vScrollBar.ValueChanged -= vScrollBar_ValueChanged; this.vScrollBar.MouseWheel -= vScrollBar_MouseWheel; if(this.viewportItemCount == 0) { this.vScrollBar.Visible = false; this.scrollY = 0; } else { if(this.itemCount == 0) { this.vScrollBar.Visible = false; this.scrollY = 0; } else { if(this.itemCount > this.viewportItemCount) { this.vScrollBar.Visible = true; this.vScrollBar.Minimum = 0; this.vScrollBar.Maximum = this.contentHeight - this.viewportHeight + 10; this.scrollY = Math.Max(this.vScrollBar.Minimum, Math.Min(this.scrollY, this.vScrollBar.Maximum)); this.vScrollBar.Value = this.scrollY; } else { this.vScrollBar.Visible = false; this.scrollY = 0; } } } this.vScrollBar.ValueChanged += vScrollBar_ValueChanged; this.vScrollBar.MouseWheel += vScrollBar_MouseWheel; } #endregion #region 계산하기 - Calculate() /// <summary> /// 계산하기 /// </summary> private void Calculate() { int temporaryViewportWidth = ClientSize.Width; int temporaryViewportHeight = ClientSize.Height; int temporaryViewportItemXCount = temporaryViewportWidth / this.itemWidth; int temporaryViewportItemYCount = temporaryViewportHeight / this.itemHeight; int temporaryViewportItemCount = temporaryViewportItemXCount * temporaryViewportItemYCount; if(temporaryViewportItemCount == 0) { this.viewportItemCount = 0; } else { this.itemCount = this.itemList == null ? 0 : this.itemList.Count; if(this.itemCount == 0) { this.viewportItemCount = 0; } else { if(this.itemCount > temporaryViewportItemCount) { temporaryViewportWidth = ClientSize.Width - this.scrollBarWidth; temporaryViewportHeight = ClientSize.Height; temporaryViewportItemXCount = temporaryViewportWidth / this.itemWidth; temporaryViewportItemYCount = temporaryViewportHeight / this.itemHeight; temporaryViewportItemCount = temporaryViewportItemXCount * temporaryViewportItemYCount; if(temporaryViewportItemCount == 0) { this.viewportItemCount = 0; } else { this.viewportWidth = temporaryViewportWidth; this.viewportHeight = temporaryViewportHeight; this.viewportItemXCount = temporaryViewportItemXCount; this.viewportItemYCount = temporaryViewportItemYCount; this.viewportItemCount = temporaryViewportItemCount; this.contentWidth = this.viewportItemXCount * this.itemWidth; this.contentHeight = (GalleryHelper.GetRowIndex(this.viewportItemXCount, this.itemCount - 1) + 1) * this.itemHeight; } } else { this.viewportWidth = temporaryViewportWidth; this.viewportHeight = temporaryViewportHeight; this.viewportItemXCount = temporaryViewportItemXCount; this.viewportItemYCount = temporaryViewportItemYCount; this.viewportItemCount = temporaryViewportItemCount; this.contentWidth = this.viewportItemXCount * this.itemWidth; this.contentHeight = (GalleryHelper.GetRowIndex(this.viewportItemXCount, this.itemCount - 1) + 1) * this.itemHeight; } } } SetScrollBar(); Invalidate(); } #endregion } } |
▶ MainForm.cs
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using System.Collections.Generic; using System.Drawing; using System.IO; 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(); string sourceImageDirectoryPath = "IMAGE"; string[] filePathArray = Directory.GetFiles(sourceImageDirectoryPath, "*.*", SearchOption.TopDirectoryOnly); List<GalleryItem> itemList = new List<GalleryItem>(); for(int i = 0; i < 30; i++) { GalleryItem item = new GalleryItem(); item.Image = new Bitmap(filePathArray[i]); itemList.Add(item); } this.galleryControl.ItemList = itemList; } #endregion } } |
