重写C# winform 进度条的样式(要代码示例)
3个回答
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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));
}
展开全部
无需重写
自己新建个组建,继承自Control或PictureBox
自己绘制进度
向外提供最小值最大值当前值属性或方法即可
当值改变时,重绘
override OnPaint
自己新建个组建,继承自Control或PictureBox
自己绘制进度
向外提供最小值最大值当前值属性或方法即可
当值改变时,重绘
override OnPaint
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展开全部
http://www.yesky.com/427/1878927.shtml
这个连接上的内容看一下就OK了
我看了UserControl和Control类的区别还是有区别的,Control类继承了实现了更多的接口,很复杂。UserControl就只单纯的提供简单的灵活的控件自定义!
Control类不能被继承(可以继承,可是里面要怎么写呢?不知道了),应为封装的你看不到他里面的方法实现!所以要继承UserControl
这个连接上的内容看一下就OK了
我看了UserControl和Control类的区别还是有区别的,Control类继承了实现了更多的接口,很复杂。UserControl就只单纯的提供简单的灵活的控件自定义!
Control类不能被继承(可以继承,可是里面要怎么写呢?不知道了),应为封装的你看不到他里面的方法实现!所以要继承UserControl
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