请帮我写一份winform的自定义Silder控件用来进行视频进度条显示
时间: 2023-05-12 16:06:41 浏览: 115
好的,以下是一个简单的winform自定义Slider控件的代码示例:
```csharp
using System;
using System.Drawing;
using System.Windows.Forms;
public class CustomSlider : Control
{
private int _minimum = 0;
private int _maximum = 100;
private int _value = 0;
public int Minimum
{
get { return _minimum; }
set
{
_minimum = value;
if (_minimum > _maximum)
_maximum = _minimum;
if (_value < _minimum)
_value = _minimum;
Invalidate();
}
}
public int Maximum
{
get { return _maximum; }
set
{
_maximum = value;
if (_maximum < _minimum)
_minimum = _maximum;
if (_value > _maximum)
_value = _maximum;
Invalidate();
}
}
public int Value
{
get { return _value; }
set
{
if (_value != value)
{
if (value < _minimum)
_value = _minimum;
else if (value > _maximum)
_value = _maximum;
else
_value = value;
Invalidate();
OnValueChanged(EventArgs.Empty);
}
}
}
public event EventHandler ValueChanged;
protected virtual void OnValueChanged(EventArgs e)
{
if (ValueChanged != null)
ValueChanged(this, e);
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
// 绘制背景
e.Graphics.Clear(BackColor);
// 绘制进度条
int barWidth = (int)((Width - 6) * ((double)(_value - _minimum) / (_maximum - _minimum)));
Rectangle barRect = new Rectangle(3, (Height - 8) / 2, barWidth, 8);
e.Graphics.FillRectangle(Brushes.Blue, barRect);
// 绘制边框
e.Graphics.DrawRectangle(Pens.Black, 0, 0, Width - 1, Height - 1);
}
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
// 根据鼠标位置计算新的值
int newValue = _minimum + (int)((double)(e.X - 3) / (Width - 6) * (_maximum - _minimum));
Value = newValue;
}
}
```
这个控件可以通过设置Minimum、Maximum和Value属性来控制进度条的显示,也可以通过订阅ValueChanged事件来响应值的变化。在OnPaint方法中,我们使用Graphics对象绘制了一个蓝色的进度条和一个黑色的边框。在OnMouseDown方法中,我们根据鼠标位置计算新的值,并调用Value属性来设置它。
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