C#自定义控件 ————进度条

先看看样式









一个扇形的进度条

对外公开的方法和属性

事件

value_change;//值改变时触发的事件
progress_finshed;//进度条跑完时触发的事件

属性

Max_value//获取最大值

Min_value//获取最小值

Current_value//设置或获取当前值设置

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Threading;

namespace WindowsFormsApplication19
{
public partial class CustomControl1 : Control
{
Bitmap background;
//进度条的最大值，最小值，和当前值
private int min_value = 0;
private int max_value = 100;
private int current_value;
private int min_value_protect_value = 0;//用户保护max和min变量只赋值一次的值
private int max_value_protect_value = 0;//

//控件的最小吃寸
private int min_size;
//三个颜色，最外层，中间层和最内填充层
private Color edge_line_color = Color.FromArgb(150, 174, 193);
private Color edge_2_line_color = Color.FromArgb(93, 136, 163);
private Color inside_fill_color = Color.FromArgb(231, 230, 235);
//字体颜色
private Color str_color = Color.Black;
//最外层和中间层的宽度
private float edge_line_width = 5f;
private float edge_2_line_width = 5f;

private DockStyle dock=DockStyle.None;

//事件
public delegate void vaule_change_invoke(EventArgs args);
public event vaule_change_invoke value_change;//值改变时触发的事件
public event vaule_change_invoke progress_finshed;//进度条跑完时触发的事件

//这里我暂时不对外开放接口，控件样式固定
/*
public Color Edge_line_color
{
get { return edge_line_color; }
set { edge_line_color = value; }
}

public Color Edge_2_line_color
{
get { return edge_2_line_color; }
set { edge_2_line_color = value; }
}

public Color Inside_fill_color
{
get { return inside_fill_color; }
set { inside_fill_color = value; }
}

public Color Str_color
{
get { return str_color; }
set { str_color = value; }
}

public float Edge_line_width
{
get { return edge_line_width; }
set
{
if (value > 0)
edge_line_width = value;
}
}

public float Edge_2_line_width
{
get { return edge_2_line_width; }
set
{
if (value > 0)
edge_2_line_width = value;
}
}
*/

[Browsable(false)]
public new DockStyle Dock
{
get { return dock; }
set { dock = value; }
}

/// <summary>
/// 获取最小值
/// </summary>
[Browsable(false)]

public int Min_value
{
get { return min_value; }
private set
{
if (value >= 0&&value<max_value && min_value_protect_value == 0)
{
min_value = value;
current_value = value;
min_value_protect_value = 1;
}
}
}

/// <summary>
/// 获取最大值
/// </summary>
[Browsable(false)]
public int Max_value
{
get { return max_value; }
private set
{
if (value > 0 && value > Min_value && max_value_protect_value == 0)
{
max_value = value;
max_value_protect_value=1;
}
}
}

/// <summary>
/// 设置或获取当前值，范围0-100
/// </summary>
public int Current_value
{
get { return current_value; }
set
{
if (value >= min_value && value <= max_value)
{
current_value = value;
//触发派生重写方法
this.onvaluechange(new EventArgs());
//重绘控件
this.Invalidate();
if (progress_finshed != null)
{
//进度条跑完时触发
if (max_value == current_value)
this.progress_finshed(new EventArgs());

}
if (value_change != null)
{
//触发事件
this.value_change(new EventArgs());
}
}
}
}

public CustomControl1()
{
InitializeComponent();
setinfo();
//这里触发一次OnInvalidated，保证在onpaint前建立背景位图
this.Invalidate();
min_size = (int)(edge_2_line_width * 2 + edge_line_width * 2 + 50);
}

/// <summary>
/// 绘图优化
/// </summary>
private void setinfo()
{
this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
this.SetStyle(ControlStyles.ResizeRedraw, true);
this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
}

/// <summary>
/// 值修改触发的方法
/// </summary>
/// <param name="eventArgs"></param>
protected virtual void onvaluechange(EventArgs eventArgs)
{

}

protected override void OnResize(EventArgs e)
{
//保证控件最小尺寸
　　　　　　 //防止拖拽时崩毁　

int temp = Math.Min(Width, Height);
temp = temp > min_size ? temp : min_size;
Width = Height = temp;
build_bitmap_buffer();
this.Invalidate();
base.OnResize(e);
}

/// <summary>
/// 控件及子控件重绘
/// </summary>
/// <param name="pe"></param>
protected override void OnPaint(PaintEventArgs pe)
{
base.OnPaint(pe);
}

/// <summary>
/// 控件重绘
/// </summary>
/// <param name="e"></param>
protected override void OnInvalidated(InvalidateEventArgs e)
{

if (background != null)
update_the_progress_bar();
else
{
build_bitmap_buffer();
}
base.OnInvalidated(e);
}

/// <summary>
/// 创建背景缓冲位图
/// </summary>
private void build_bitmap_buffer()
{
if (background != null)
{
background.Dispose();
}
background = new Bitmap(Width, Width);
Graphics g = Graphics.FromImage(background);
g.Clear(Color.Transparent);
g.Dispose();
}

/// <summary>
/// 根据当前值更新进度条
/// </summary>
private void update_the_progress_bar()
{
Graphics g = Graphics.FromImage(background);
Draw_with_HighQuality(g);
g.Clear(Color.Transparent);
Pen p = new Pen(edge_line_color, edge_line_width);
#region 绘制最外部圆
int x_y = (int)(edge_line_width / 2);
int w_h = Width - (int)edge_line_width;
Rectangle rect = new Rectangle(x_y, x_y, w_h, w_h);
g.DrawEllipse(p, rect);
#endregion

#region 绘制第二层圆
p.Width = edge_2_line_width;
p.Color = edge_2_line_color;
x_y += (int)(edge_line_width / 2 + edge_2_line_width / 2);
w_h = Width - (int)(edge_line_width * 2 + edge_2_line_width);
rect = new Rectangle(x_y, x_y, w_h, w_h);
g.DrawEllipse(p, rect);
#endregion
p.Dispose();

#region 绘制扇形
Brush sb = new SolidBrush(inside_fill_color);
x_y = (int)(edge_line_width + edge_2_line_width);
w_h = Width - x_y * 2;
rect = new Rectangle(x_y, x_y, w_h, w_h);
float rad = ((float)current_value - min_value) / ((float)max_value - min_value);
float frad = (360 * rad);
g.FillPie(sb, rect, -90, frad);
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
g.DrawString((rad * 100).ToString() + "%", new Font("宋体", 12, FontStyle.Bold), new SolidBrush(str_color), this.ClientRectangle, sf);
#endregion

g.Dispose();
this.BackgroundImage = background;
}

/// <summary>
/// 高质量绘图
/// </summary>
/// <param name="g">绘图工具graphics</param>
private void Draw_with_HighQuality(Graphics g)
{
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.CompositingQuality = CompositingQuality.HighQuality;
}
}
}

源码地址： http://pan.baidu.com/s/1i3N2vlz
压缩文件为测试控件的demo；

cs是控件的源码文件；直接添加到项目中和其他控件一样拖进去就可以了