查了很多资料,都找不到直接重写ListBox滚动条的方法,只能曲线救国,先自己重绘一个带皮肤的滚动条,然后让它取代ListBox现有的滚动条.
老习惯，先传个效果图，你觉得感兴趣就继续看下去，不喜欢的话就此打住，懒得耽误你宝贵的时间，嘿嘿注意，此图中的滚动条宽度明显小于ListBox本身滚动条的宽度，我目前只顾着实现功能了，毕竟，宽度调整相当简单哈。
下面简单介绍下重绘系统滚动条的详细步骤:
1.在项目中添加新项--用户控件,我们命名为CustomScrollbar.cs
2.准备几张图片添加进项目资源作为滚动条重绘时要用的背景,我用的图片如下:
uparrow.png资源名称为uparrow ，滚动条的上箭头
ThumbBottom.png资源名称为ThumbBottom ，滚动条中间滑道的背景
ThumbMiddle.png资源名称为ThumbMiddle ，滚动条的中间的拖动块
downarrow.png资源名称为downarrow ，滚动条的下箭头
3.然后就是利用上面图片做背景重画滚动条背景了,直接给出CustomScrollbar.cs的代码吧
Code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.Diagnostics;
namespace Winamp
{
[Designer(typeof(ScrollbarControlDesigner))]
public partial class CustomScrollbar : UserControl
{
protected Color moChannelColor = Color.Empty;
protected Image moUpArrowImage = null;//上箭头
//protected Image moUpArrowImage_Over = null;
//protected Image moUpArrowImage_Down = null;
protected Image moDownArrowImage = null;//下箭头
//protected Image moDownArrowImage_Over = null;
//protected Image moDownArrowImage_Down = null;
protected Image moThumbArrowImage = null;
protected Image moThumbTopImage = null;
protected Image moThumbTopSpanImage = null;
protected Image moThumbBottomImage = null;
protected Image moThumbBottomSpanImage = null;
protected Image moThumbMiddleImage = null;
protected int moLargeChange = 10;
protected int moSmallChange = 1;
protected int moMinimum = 0;
protected int moMaximum = 100;
protected int moValue = 0;
private int nClickPoint;
protected int moThumbTop = 0;
protected bool moAutoSize = false;
private bool moThumbDown = false;
private bool moThumbDragging = false;
public new event EventHandler Scroll = null;
public event EventHandler ValueChanged = null;
private int GetThumbHeight()
{
int nTrackHeight = (this.Height - (UpArrowImage.Height + DownArrowImage.Height));
float fThumbHeight = ((float)LargeChange / (float)Maximum) * nTrackHeight;
int nThumbHeight = (int)fThumbHeight;
if (nThumbHeight > nTrackHeight)
{
nThumbHeight = nTrackHeight;
fThumbHeight = nTrackHeight;
}
if (nThumbHeight < 56)
{
nThumbHeight = 56;
fThumbHeight = 56;
}
return nThumbHeight;
}
public CustomScrollbar()
{
InitializeComponent();
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.DoubleBuffer, true);
moChannelColor = Color.FromArgb(51, 166, 3);
UpArrowImage = BASSSkin.uparrow;//上箭头
DownArrowImage = BASSSkin.downarrow;//下肩头
ThumbBottomImage = BASSSkin.ThumbBottom;
ThumbMiddleImage = BASSSkin.ThumbMiddle;
this.Width = UpArrowImage.Width;//18px
base.MinimumSize = new Size(UpArrowImage.Width, UpArrowImage.Height + DownArrowImage.Height + GetThumbHeight());
}
[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("Behavior"), Description("LargeChange")]
public int LargeChange
{
get { return moLargeChange; }
set
{
moLargeChange = value;
Invalidate();
}
}
[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("Behavior"), Description("SmallChange")]
public int SmallChange
{
get { return moSmallChange; }
set
{
moSmallChange = value;
Invalidate();
}
}
[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("Behavior"), Description("Minimum")]
public int Minimum
{
get { return moMinimum; }
set
{
moMinimum = value;
Invalidate();
}
}
[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("Behavior"), Description("Maximum")]
public int Maximum
{
get { return moMaximum; }
set
{
moMaximum = value;
Invalidate();
}
}
[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("Behavior"), Description("Value")]
public int Value
{
get { return moValue; }
set
{
moValue = value;
int nTrackHeight = (this.Height - (UpArrowImage.Height + DownArrowImage.Height));
float fThumbHeight = ((float)LargeChange / (float)Maximum) * nTrackHeight;
int nThumbHeight = (int)fThumbHeight;
if (nThumbHeight > nTrackHeight)
{
nThumbHeight = nTrackHeight;
fThumbHeight = nTrackHeight;
}
if (nThumbHeight < 56)
{
nThumbHeight = 56;
fThumbHeight = 56;
}
//figure out value
int nPixelRange = nTrackHeight - nThumbHeight;
int nRealRange = (Maximum - Minimum) - LargeChange;
float fPerc = 0.0f;
if (nRealRange != 0)
{
fPerc = (float)moValue / (float)nRealRange;
}
float fTop = fPerc * nPixelRange;
moThumbTop = (int)fTop;
Invalidate();
}
}
[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("Skin"), Description("Channel Color")]
public Color ChannelColor
{
get { return moChannelColor; }
set { moChannelColor = value; }
}
[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("Skin"), Description("Up Arrow Graphic")]
public Image UpArrowImage
{
get { return moUpArrowImage; }
set { moUpArrowImage = value; }
}
[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("Skin"), Description("Up Arrow Graphic")]
public Image DownArrowImage
{
get { return moDownArrowImage; }
set { moDownArrowImage = value; }
}
[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("Skin"), Description("Up Arrow Graphic")]
public Image ThumbBottomImage
{
get { return moThumbBottomImage; }
set { moThumbBottomImage = value; }
}
[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("Skin"), Description("Up Arrow Graphic")]
public Image ThumbMiddleImage
{
get { return moThumbMiddleImage; }
set { moThumbMiddleImage = value; }
}
protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.