How to create your own ListBox in C#
2006-11-02 16:43
591 查看
1
using System;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Windows.Forms;
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using System.ComponentModel;
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using System.Drawing.Design;
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namespace CommonDll.CommonControl
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...{
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/**//// <summary>
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/// Colorful ComboBox, Very beautiful
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/// </summary>
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public class ColorfulListBox : System.Windows.Forms.ListBox
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...{
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private Color startColor = Color.White;
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private Color endColor = Color.Blue;
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private Color selectColor = Color.Red;
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private int imageIndex = -1;
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private int selectimageIndex = -1;
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private ImageList imageList = null;
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private LinearGradientMode linearMode;
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/**//// <summary>
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/// The color of Item that was selected
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/// </summary>
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[ Category("NecessaryOptions"), Description( "The color of Item that was selected " ) ]
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public Color SelectColor
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...{
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get
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...{
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return this.selectColor;
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}
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set
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...{
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this.selectColor = value;
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}
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}
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/**//// <summary>
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/// specify start color of LinearGradientBrush object
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/// </summary>
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[ Category("NecessaryOptions"), Description( "The start color of Item " ) ]
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public Color StartColor
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...{
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get
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...{
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return this.startColor;
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}
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set
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...{
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this.startColor = value;
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}
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}
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/**//// <summary>
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/// specify end color of LinearGradientBrush object
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/// </summary>
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[ Category("NecessaryOptions"), Description( "The end color of Item " ) ]
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public Color EndColor
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...{
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get
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...{
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return this.endColor;
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}
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set
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...{
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this.endColor = value;
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}
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}
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/**//// <summary>
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/// Index of image of Draw
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/// </summary>
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[ Category("NecessaryOptions"), Description("select image of item displays"), Editor("System.Windows.Forms.Design.ImageIndexEditor, System.Design, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor)), TypeConverter(typeof(ImageIndexConverter)), Localizable(true), DefaultValue(-1)]
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public int ImageIndex
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...{
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get
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...{
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if (((this.imageIndex != -1) && (this.imageList != null)) && (this.imageIndex >= this.imageList.Images.Count))
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...{
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return (this.imageList.Images.Count - 1);
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}
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return this.imageIndex;
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}
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set
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...{
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if (value < -1)
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...{
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throw new Exception( "ERROR" );
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}
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if (this.imageIndex != value)
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...{
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this.imageIndex = value;
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base.Invalidate();
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}
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}
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}
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/**//// <summary>
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/// Index of image that was selected
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/// </summary>
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[ Category("NecessaryOptions"), Description(" Index of image that item was selected"), Editor("System.Windows.Forms.Design.ImageIndexEditor, System.Design, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor)), TypeConverter(typeof(ImageIndexConverter)), Localizable(true), DefaultValue(-1)]
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public int SelectImageIndex
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...{
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get
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...{
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if (((this.selectimageIndex != -1) && (this.imageList != null)) && (this.selectimageIndex >= this.imageList.Images.Count))
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...{
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return (this.imageList.Images.Count - 1);
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}
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return this.selectimageIndex;
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}
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set
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...{
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if (value < -1)
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...{
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throw new Exception( "ERROR" );
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}
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if (this.selectimageIndex != value)
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...{
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this.selectimageIndex = value;
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base.Invalidate();
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}
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}
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}
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/**//// <summary>
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/// the imageList of item
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/// </summary>
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[ Category("NecessaryOptions"), Description( "Image List that will be display by item " ) ]
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public ImageList MyImageList
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...{
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get
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...{
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return this.imageList;
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}
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set
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...{
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this.imageList = value;
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}
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}
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/**//// <summary>
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/// Specify the mode of LinearGradient
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/// </summary>
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[ Category("NecessaryOptions"), Description( "The Mode of LinearFradient " ) ]
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public LinearGradientMode LinearMode
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...{
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get
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...{
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return this.linearMode;
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}
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set
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...{
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this.linearMode = value;
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}
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}
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/**//// <summary>
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/// Draw Item
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/// </summary>
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/// <param name="e"></param>
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protected override void OnDrawItem(System.Windows.Forms.DrawItemEventArgs e)
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...{
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if( this.MyImageList == null || this.Items.Count == 0 )
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...{
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return;
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}
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Graphics g = e.Graphics;
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LinearGradientBrush lgb = null;
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//string str = this.Items[ e.Index ].ToString( );
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//比较这两个语句，你会发现什么错误？
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//对了，如果使用第一句，会造成绘制成：System.Data.DataRowView字样！！！！！！！！！！
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//让你不知所措，甚至气急败坏。beacuse the item maybe not a string！！！
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string str = this.GetItemText( this.Items[ e.Index ] ); //从物理层面强行转换此对象为字符串类型
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//取得一般情况下项目显示的图标
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Image im = this.MyImageList.Images[ this.ImageIndex ];
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//取得将要绘制的字符串的长度
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SizeF sizeString = g.MeasureString( str, this.Font );
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//取得图标的大小
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Size sizeImage = new Size( im.Width, im.Height );
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//设置将要绘制的图标的坐标
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Point pImage = new Point( 3, e.Bounds.Height / 2 - im.Height / 2 + e.Bounds.Y );
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//设置将要绘制的字符串的坐标
187
Point pString = new Point( im.Width + 5, e.Bounds.Height /2 - ( int )sizeString.Height / 2 + e.Bounds.Y + 1 );
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Rectangle rImage = new Rectangle( pImage, sizeImage );
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Rectangle rString = new Rectangle( pString, new Size( e.Bounds.Width - sizeImage.Width + 3, e.Bounds.Height ));
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Rectangle rLgb = e.Bounds;
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if( ( e.State & DrawItemState.Selected ) == DrawItemState.Selected )
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...{
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lgb = new LinearGradientBrush( rLgb, this.StartColor, this.EndColor, this.LinearMode );
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g.FillRectangle( lgb, rLgb );
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g.DrawImage( this.MyImageList.Images[ this.SelectImageIndex ], rImage );
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g.DrawString( str, this.Font, new SolidBrush( this.SelectColor ), rString );
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}
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else
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...{
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g.FillRectangle( Brushes.White, rLgb );
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g.DrawImage( im, rImage );
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g.DrawString( str, this.Font, new SolidBrush( this.ForeColor ), rString );
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}
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}
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}
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}
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effect as follows：
using System;
2
using System.Drawing;
3
using System.Drawing.Drawing2D;
4
using System.Windows.Forms;
5
using System.ComponentModel;
6
using System.Drawing.Design;
7
namespace CommonDll.CommonControl
8
...{
9
/**//// <summary>
10
/// Colorful ComboBox, Very beautiful
11
/// </summary>
12
public class ColorfulListBox : System.Windows.Forms.ListBox
13
...{
14
private Color startColor = Color.White;
15
private Color endColor = Color.Blue;
16
private Color selectColor = Color.Red;
17
private int imageIndex = -1;
18
private int selectimageIndex = -1;
19
private ImageList imageList = null;
20
private LinearGradientMode linearMode;
21
22
/**//// <summary>
23
/// The color of Item that was selected
24
/// </summary>
25
[ Category("NecessaryOptions"), Description( "The color of Item that was selected " ) ]
26
public Color SelectColor
27
...{
28
get
29
...{
30
return this.selectColor;
31
}
32
set
33
...{
34
this.selectColor = value;
35
}
36
}
37
38
/**//// <summary>
39
/// specify start color of LinearGradientBrush object
40
/// </summary>
41
[ Category("NecessaryOptions"), Description( "The start color of Item " ) ]
42
public Color StartColor
43
...{
44
get
45
...{
46
return this.startColor;
47
}
48
set
49
...{
50
this.startColor = value;
51
}
52
}
53
/**//// <summary>
54
/// specify end color of LinearGradientBrush object
55
/// </summary>
56
[ Category("NecessaryOptions"), Description( "The end color of Item " ) ]
57
public Color EndColor
58
...{
59
get
60
...{
61
return this.endColor;
62
}
63
set
64
...{
65
this.endColor = value;
66
}
67
}
68
/**//// <summary>
69
/// Index of image of Draw
70
/// </summary>
71
[ Category("NecessaryOptions"), Description("select image of item displays"), Editor("System.Windows.Forms.Design.ImageIndexEditor, System.Design, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor)), TypeConverter(typeof(ImageIndexConverter)), Localizable(true), DefaultValue(-1)]
72
public int ImageIndex
73
...{
74
get
75
...{
76
if (((this.imageIndex != -1) && (this.imageList != null)) && (this.imageIndex >= this.imageList.Images.Count))
77
...{
78
return (this.imageList.Images.Count - 1);
79
}
80
return this.imageIndex;
81
}
82
set
83
...{
84
if (value < -1)
85
...{
86
throw new Exception( "ERROR" );
87
}
88
if (this.imageIndex != value)
89
...{
90
this.imageIndex = value;
91
base.Invalidate();
92
}
93
}
94
}
95
96
/**//// <summary>
97
/// Index of image that was selected
98
/// </summary>
99
[ Category("NecessaryOptions"), Description(" Index of image that item was selected"), Editor("System.Windows.Forms.Design.ImageIndexEditor, System.Design, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor)), TypeConverter(typeof(ImageIndexConverter)), Localizable(true), DefaultValue(-1)]
100
public int SelectImageIndex
101
...{
102
get
103
...{
104
if (((this.selectimageIndex != -1) && (this.imageList != null)) && (this.selectimageIndex >= this.imageList.Images.Count))
105
...{
106
return (this.imageList.Images.Count - 1);
107
}
108
return this.selectimageIndex;
109
}
110
set
111
...{
112
if (value < -1)
113
...{
114
throw new Exception( "ERROR" );
115
}
116
if (this.selectimageIndex != value)
117
...{
118
this.selectimageIndex = value;
119
base.Invalidate();
120
}
121
}
122
}
123
124
/**//// <summary>
125
/// the imageList of item
126
/// </summary>
127
[ Category("NecessaryOptions"), Description( "Image List that will be display by item " ) ]
128
public ImageList MyImageList
129
...{
130
get
131
...{
132
return this.imageList;
133
}
134
set
135
...{
136
this.imageList = value;
137
}
138
}
139
/**//// <summary>
140
/// Specify the mode of LinearGradient
141
/// </summary>
142
[ Category("NecessaryOptions"), Description( "The Mode of LinearFradient " ) ]
143
public LinearGradientMode LinearMode
144
...{
145
get
146
...{
147
return this.linearMode;
148
}
149
set
150
...{
151
this.linearMode = value;
152
}
153
}
154
/**//// <summary>
155
/// Draw Item
156
/// </summary>
157
/// <param name="e"></param>
158
protected override void OnDrawItem(System.Windows.Forms.DrawItemEventArgs e)
159
...{
160
if( this.MyImageList == null || this.Items.Count == 0 )
161
...{
162
return;
163
}
164
Graphics g = e.Graphics;
165
LinearGradientBrush lgb = null;
166
167
//string str = this.Items[ e.Index ].ToString( );
168
//比较这两个语句，你会发现什么错误？
169
//对了，如果使用第一句，会造成绘制成：System.Data.DataRowView字样！！！！！！！！！！
170
//让你不知所措，甚至气急败坏。beacuse the item maybe not a string！！！
171
string str = this.GetItemText( this.Items[ e.Index ] ); //从物理层面强行转换此对象为字符串类型
172
173
174
//取得一般情况下项目显示的图标
175
Image im = this.MyImageList.Images[ this.ImageIndex ];
176
177
//取得将要绘制的字符串的长度
178
SizeF sizeString = g.MeasureString( str, this.Font );
179
180
//取得图标的大小
181
Size sizeImage = new Size( im.Width, im.Height );
182
183
//设置将要绘制的图标的坐标
184
Point pImage = new Point( 3, e.Bounds.Height / 2 - im.Height / 2 + e.Bounds.Y );
185
186
//设置将要绘制的字符串的坐标
187
Point pString = new Point( im.Width + 5, e.Bounds.Height /2 - ( int )sizeString.Height / 2 + e.Bounds.Y + 1 );
188
189
Rectangle rImage = new Rectangle( pImage, sizeImage );
190
Rectangle rString = new Rectangle( pString, new Size( e.Bounds.Width - sizeImage.Width + 3, e.Bounds.Height ));
191
Rectangle rLgb = e.Bounds;
192
if( ( e.State & DrawItemState.Selected ) == DrawItemState.Selected )
193
...{
194
lgb = new LinearGradientBrush( rLgb, this.StartColor, this.EndColor, this.LinearMode );
195
g.FillRectangle( lgb, rLgb );
196
g.DrawImage( this.MyImageList.Images[ this.SelectImageIndex ], rImage );
197
g.DrawString( str, this.Font, new SolidBrush( this.SelectColor ), rString );
198
}
199
else
200
...{
201
g.FillRectangle( Brushes.White, rLgb );
202
g.DrawImage( im, rImage );
203
g.DrawString( str, this.Font, new SolidBrush( this.ForeColor ), rString );
204
}
205
}
206
}
207
}
208
effect as follows：
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