实例介绍
【实例简介】
【实例截图】
【核心代码】
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | 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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