■ TileView 클래스의 GetThumbnailImage 이벤트를 사용해 썸네일을 비동기 생성하는 방법을 보여준다.
▶ MainForm.cs
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using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Drawing2D; using DevExpress.Utils; using DevExpress.XtraEditors; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : XtraForm { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 텍스처 리스트 /// </summary> private List<Texture> textureList; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); #region 텍스처 리스트를 설정한다. this.textureList = new List<Texture>(); Array colorNameArray = Enum.GetNames(typeof(KnownColor)); foreach(object colorName in colorNameArray ) { this.textureList.Add(new Texture(colorName.ToString())); } #endregion this.gridControl.DataSource = textureList; #region 타일 뷰를 설정한다. this.tileView.ColumnSet.BackgroundImageColumn = nameColumn; this.tileView.OptionsTiles.ItemSize = new Size(90, 40); this.tileView.OptionsImageLoad.AsyncLoad = true; this.tileView.OptionsImageLoad.LoadThumbnailImagesFromDataSource = false; this.tileView.OptionsImageLoad.RandomShow = true; #endregion this.tileView.GetThumbnailImage += tileView_GetThumbnailImage; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 타일 뷰 썸네일 이미지 구하기 - tileView_GetThumbnailImage(sender, e) /// <summary> /// 타일 뷰 썸네일 이미지 구하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void tileView_GetThumbnailImage(object sender, ThumbnailImageEventArgs e) { string colorName = this.textureList[e.DataSourceIndex].Name; e.ThumbnailImage = GetBitmap(e.DesiredThumbnailSize, colorName); } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 비트맵 구하기 - GetBitmap(bitmapSize, colorName) /// <summary> /// 비트맵 구하기 /// </summary> /// <param name="bitmapSize">비트맵 크기</param> /// <param name="colorName">색상명</param> /// <returns>비트맵</returns> private Bitmap GetBitmap(Size bitmapSize, string colorName) { Bitmap bitmap = new Bitmap(bitmapSize.Width, bitmapSize.Height); using(Graphics graphics = Graphics.FromImage(bitmap)) { Color color = Color.FromName(colorName); GraphicsUnit graphicsUnit = GraphicsUnit.Pixel; RectangleF rectangle = bitmap.GetBounds(ref graphicsUnit); using(LinearGradientBrush brush = new LinearGradientBrush(rectangle, Color.White, Color.White, 45, false)) { ColorBlend colorBlend = new ColorBlend(4); colorBlend.Colors = new Color[4] { Color.White, color, color, Color.White }; colorBlend.Positions = new float[4] { 0f, 0.5f, 0.7f, 1f }; brush.InterpolationColors = colorBlend; graphics.FillRectangle(brush, rectangle); } } return bitmap; } #endregion } } |
