C#Winform实现圆角无锯齿按钮
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本文实例为大家分享了C# Winform实现圆角无锯齿按钮的具体代码，供大家参考，具体内容如下
发现用Winform做一个圆角按钮遇到麻烦，主要是锯齿问题，后面想了想办法解决问题了。
主要方法是按钮的区域通过Region指定，但按钮需要自己画，否则怎么搞都出现锯齿，网上有朋友提供一个漂亮的方案，可是代码不完整无法使用，我的解决方案现在分享如下：
代码：
public enum ControlState { Hover , Normal, Pressed }
public class RoundButton : Button
{
private int radius;//半径
private Color _baseColor = Color.FromArgb(51, 161, 224);//基颜色
private Color _hoverColor= Color.FromArgb(51, 0, 224);//基颜色
private Color _normalColor = Color.FromArgb(0, 161, 224);//基颜色
private Color _pressedColor = Color.FromArgb(51, 161, 0);//基颜色
//圆形按钮的半径属性
[CategoryAttribute("布局"), BrowsableAttribute(true), ReadOnlyAttribute(false)]
public int Radius
{
set
{
radius = value;
this.Invalidate();
}
get
{
return radius;
}
}
[DefaultValue(typeof(Color), "51, 161, 224")]
public Color NormalColor
{
get
{
return this._normalColor;
}
set
{
this._normalColor = value;
this.Invalidate();
}
}
// [DefaultValue(typeof(Color), "220, 80, 80")]
public Color HoverColor {
get
{
return this._hoverColor;
}
set
{
this._hoverColor = value;
this.Invalidate();
}
}
// [DefaultValue(typeof(Color), "251, 161, 0")]
public Color PressedColor {
get
{
return this._pressedColor;
}
set
{
this._pressedColor = value;
this.Invalidate();
}
}
public ControlState ControlState { get; set; }
protected override void OnMouseEnter(EventArgs e)//鼠标进入时
{
base.OnMouseEnter(e);
ControlState = ControlState.Hover;//正常
}
protected override void OnMouseLeave(EventArgs e)//鼠标离开
{
base.OnMouseLeave(e);
ControlState = ControlState.Normal;//正常
}
protected override void OnMouseDown(MouseEventArgs e)//鼠标按下
{
base.OnMouseDown(e);
if (e.Button == MouseButtons.Left && e.Clicks == 1)//鼠标左键且点击次数为1
{
ControlState = ControlState.Pressed;//按下的状态
}
}
protected override void OnMouseUp(MouseEventArgs e)//鼠标弹起
{
base.OnMouseUp(e);
if (e.Button == MouseButtons.Left && e.Clicks == 1)
{
if (ClientRectangle.Contains(e.Location))//控件区域包含鼠标的位置
{
ControlState = ControlState.Hover;
}
else
{
ControlState = ControlState.Normal;
}
}
}
public RoundButton()
{
Radius = 15;
this.FlatStyle = FlatStyle.Flat;
this.FlatAppearance.BorderSize = 0;
this.ControlState = ControlState.Normal;
this.SetStyle(
ControlStyles.UserPaint | //控件自行绘制，而不使用操作系统的绘制
ControlStyles.AllPaintingInWmPaint | //忽略擦出的消息，减少闪烁。
ControlStyles.OptimizedDoubleBuffer |//在缓冲区上绘制，不直接绘制到屏幕上，减少闪烁。
ControlStyles.ResizeRedraw | //控件大小发生变化时，重绘。
ControlStyles.SupportsTransparentBackColor, true);//支持透明背景颜色
}
private Color GetColor(Color colorBase, int a, int r, int g, int b)
{
int a0 = colorBase.A;
int r0 = colorBase.R;
int g0 = colorBase.G;
int b0 = colorBase.B;
if (a + a0 > 255) { a = 255; } else { a = Math.Max(a + a0, 0); }
if (r + r0 > 255) { r = 255; } else { r = Math.Max(r + r0, 0); }
if (g + g0 > 255) { g = 255; } else { g = Math.Max(g + g0, 0); }
if (b + b0 > 255) { b = 255; } else { b = Math.Max(b + b0, 0); }
return Color.FromArgb(a, r, g, b);
}
//重写OnPaint
protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
base.OnPaint(e);
base.OnPaintBackground(e);
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
e.Graphics.CompositingQuality = CompositingQuality.HighQuality;
e.Graphics.InterpolationMode = InterpolationMode.HighQualityBilinear;
Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);
var path = GetRoundedRectPath(rect, radius);
this.Region = new Region(path);
Color baseColor;
//Color borderColor;
//Color innerBorderColor = this._baseColor;//Color.FromArgb(200, 255, 255, 255); ;
switch (ControlState)
{
case ControlState.Hover:
baseColor = this.HoverColor;
break;
case ControlState.Pressed:
baseColor = this.PressedColor;
break;
case ControlState.Normal:
baseColor = this.NormalColor;
break;
default:
baseColor = this.NormalColor;
break;
}
using (SolidBrush b = new SolidBrush(baseColor))
{
e.Graphics.FillPath(b, path);
Font fo = new Font("宋体", 10.5F);
Brush brush = new SolidBrush(this.ForeColor);
StringFormat gs = new StringFormat();
gs.Alignment = StringAlignment.Center; //居中
gs.LineAlignment = StringAlignment.Center;//垂直居中
e.Graphics.DrawString(this.Text, fo, brush, rect, gs);
// e.Graphics.DrawPath(p, path);
}
}
private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius)
{
int diameter = radius;
Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter));
GraphicsPath path = new GraphicsPath();
path.AddArc(arcRect, 180, 90);
arcRect.X = rect.Right - diameter;
path.AddArc(arcRect, 270, 90);
arcRect.Y = rect.Bottom - diameter;
path.AddArc(arcRect, 0, 90);
arcRect.X = rect.Left;
path.AddArc(arcRect, 90, 90);
path.CloseFigure();
return path;
}
protected override void OnSizeChanged(EventArgs e)
{
base.OnSizeChanged(e);
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
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