实例介绍
【实例简介】
【实例截图】
【核心代码】
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace testexListBox { class exListBoxItem { private string _title; private string _details; private Image _itemImage; private int _id; public int Id { get { return _id; } set { _id = value; } } public exListBoxItem(int id, string title, string details, Image image) { _id = id; _title = title; _details = details; _itemImage = image; } public string Title { get { return _title; } set { _title = value; } } public string Details { get { return _details; } set { _details = value; } } public Image ItemImage { get { return _itemImage; } set { _itemImage = value; } } public void drawItem(DrawItemEventArgs e, Padding margin, Font titleFont, Font detailsFont, StringFormat aligment, Size imageSize) { bool isHighlighted = (e.State & DrawItemState.Selected) == DrawItemState.Selected; // if selected, mark the background differently e.Graphics.FillRectangle(isHighlighted ? Brushes.DarkBlue : Brushes.White, e.Bounds); // draw some item separator e.Graphics.DrawLine(Pens.DarkGray, e.Bounds.X, e.Bounds.Y, e.Bounds.X e.Bounds.Width, e.Bounds.Y); // draw item image e.Graphics.DrawImage(this.ItemImage, e.Bounds.X margin.Left, e.Bounds.Y margin.Top, imageSize.Width, imageSize.Height); // draw a border around the image e.Graphics.DrawRectangle(Pens.DarkGray, e.Bounds.X margin.Left, e.Bounds.Y margin.Top, imageSize.Width, imageSize.Height); // calculate bounds for title text drawing Rectangle titleBounds = new Rectangle(e.Bounds.X margin.Horizontal imageSize.Width, e.Bounds.Y margin.Top, e.Bounds.Width - margin.Right - imageSize.Width - margin.Horizontal, (int)titleFont.GetHeight() 2); // calculate bounds for details text drawing Rectangle detailBounds = new Rectangle(e.Bounds.X margin.Horizontal imageSize.Width, e.Bounds.Y (int)titleFont.GetHeight() 2 margin.Vertical margin.Top, e.Bounds.Width - margin.Right - imageSize.Width - margin.Horizontal, e.Bounds.Height - margin.Bottom - (int)titleFont.GetHeight() - 2 - margin.Vertical - margin.Top); // draw the text within the bounds var brush = isHighlighted ? Brushes.White : Brushes.Black; e.Graphics.DrawString(this.Title, titleFont, brush, titleBounds, aligment); e.Graphics.DrawString(this.Details, detailsFont, brush, detailBounds, aligment); // put some focus rectangle e.DrawFocusRectangle(); } } public partial class exListBox : ListBox { private Size _imageSize; private StringFormat _fmt; private Font _titleFont; private Font _detailsFont; public exListBox(Font titleFont, Font detailsFont, Size imageSize, StringAlignment aligment, StringAlignment lineAligment) { _titleFont = titleFont; _detailsFont = detailsFont; _imageSize = imageSize; this.ItemHeight = _imageSize.Height this.Margin.Vertical; _fmt = new StringFormat(); _fmt.Alignment = aligment; _fmt.LineAlignment = lineAligment; _titleFont = titleFont; _detailsFont = detailsFont; } public exListBox() { InitializeComponent(); _imageSize = new Size(60,60); this.ItemHeight = _imageSize.Height this.Margin.Vertical; _fmt = new StringFormat(); _fmt.Alignment = StringAlignment.Near; _fmt.LineAlignment = StringAlignment.Near; _titleFont = new Font(this.Font, FontStyle.Bold); _detailsFont = new Font(this.Font, FontStyle.Regular); } protected override void OnDrawItem(DrawItemEventArgs e) { // prevent from error Visual Designer if (this.Items.Count > 0) { exListBoxItem item = (exListBoxItem)this.Items[e.Index]; item.drawItem(e, this.Margin, _titleFont, _detailsFont, _fmt, this._imageSize); } } protected override void OnPaint(PaintEventArgs pe) { base.OnPaint(pe); } } }
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