using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;namespace SmoothProgressBar
{
/// <summary>
/// UserControl1 的摘要说明。
/// </summary>
public class SmoothProgressBar : System.Windows.Forms.UserControl
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null; public SmoothProgressBar()
{
// 该调用是 Windows.Forms 窗体设计器所必需的。
InitializeComponent(); // TODO: 在 InitComponent 调用后添加任何初始化
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if( components != null )
components.Dispose();
}
base.Dispose( disposing );
} #region 组件设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器
/// 修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
//
// SmoothProgressBar
//
this.Name = "SmoothProgressBar"; }
#endregion int min = 0; // Minimum value for progress range
int max = 100; // Maximum value for progress range
int val = 0; // Current progress
Color BarColor = Color.Blue; // Color of progress meter protected override void OnResize(EventArgs e)
{
// Invalidate the control to get a repaint.
this.Invalidate();
} protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
SolidBrush brush = new SolidBrush(BarColor);
float percent = (float)(val - min) / (float)(max - min);
Rectangle rect = this.ClientRectangle; // Calculate area for drawing the progress.
rect.Width = (int)((float)rect.Width * percent); // Draw the progress meter.
g.FillRectangle(brush, rect); // Draw a three-dimensional border around the control.
Draw3DBorder(g); // Clean up.
brush.Dispose();
g.Dispose();
} public int Minimum
{
get
{
return min;
} set
{
// Prevent a negative value.
if (value < 0)
{
min = 0;
}
// Make sure that the minimum value is never set higher than the maximum value.
if (value > max)
{
min = value;
min = value;
}
// Ensure value is still in range
if (val < min)
{
val = min;
} // Invalidate the control to get a repaint.
this.Invalidate();
}
} public int Maximum
{
get
{
return max;
} set
{
// Make sure that the maximum value is never set lower than the minimum value.
if (value < min)
{
min = value;
} max = value;
// Make sure that value is still in range.
if (val > max)
{
val = max;
} // Invalidate the control to get a repaint.
this.Invalidate();
}
} public int Value
{
get
{
return val;
} set
{
int oldValue = val; // Make sure that the value does not stray outside the valid range.
if (value < min)
{
val = min;
}
else if (value > max)
{
val = max;
}
else
{
val = value;
} // Invalidate only the changed area.
float percent; Rectangle newValueRect = this.ClientRectangle;
Rectangle oldValueRect = this.ClientRectangle; // Use a new value to calculate the rectangle for progress.
percent = (float)(val - min) / (float)(max - min);
newValueRect.Width = (int)((float)newValueRect.Width * percent); // Use an old value to calculate the rectangle for progress.
percent = (float)(oldValue - min) / (float)(max - min);
oldValueRect.Width = (int)((float)oldValueRect.Width * percent); Rectangle updateRect = new Rectangle();
// Find only the part of the screen that must be updated.
if (newValueRect.Width > oldValueRect.Width)
{
updateRect.X = oldValueRect.Size.Width;
updateRect.Width = newValueRect.Width - oldValueRect.Width;
}
else
{
updateRect.X = newValueRect.Size.Width;
updateRect.Width = oldValueRect.Width - newValueRect.Width;
} updateRect.Height = this.Height;
// Invalidate the intersection region only.
this.Invalidate(updateRect);
}
} public Color ProgressBarColor
{
get
{
return BarColor;
} set
{
BarColor = value; // Invalidate the control to get a repaint.
this.Invalidate();
}
} private void Draw3DBorder(Graphics g)
{
int PenWidth = (int)Pens.White.Width; g.DrawLine(Pens.DarkGray,
new Point(this.ClientRectangle.Left, this.ClientRectangle.Top),
new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Top));
g.DrawLine(Pens.DarkGray,
new Point(this.ClientRectangle.Left, this.ClientRectangle.Top),
new Point(this.ClientRectangle.Left, this.ClientRectangle.Height - PenWidth));
g.DrawLine(Pens.White,
new Point(this.ClientRectangle.Left, this.ClientRectangle.Height - PenWidth),
new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Height - PenWidth));
g.DrawLine(Pens.White,
new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Top),
new Point(this.ClientRectangle.Width - PenWidth, this.ClientRectangle.Height - PenWidth));
}
}
}
