C#winform之自定义按钮形状（初级版）

一、前情回顾

小猿人在2020-08-13 00:59:53发过一篇没写完的博客，
如今突然想起，
想码码
也好不留遗憾，
就像爱一个姑娘，
总感觉爱得不够
总感觉爱得不深
时间很短
等待很长
岁月不饶程序人
啊~~~~
也罢，开始码代码：

二、实现效果

注：蓝色的roundButton1和红色showButton1

三、实现过程

1：具体实现如下：
原理：通过继承Button类，重写OnPaint()方法，使用画笔工具重绘控件样式。

    public class myButton : System.Windows.Forms.Button{private Color enterForeColor = Color.White;private Color leftForeColor = Color.Black;private bool Isleft = true;public bool IsLEFT{get { return Isleft; }set{this.Isleft = value;}}public Color EnterForeColor{get { return enterForeColor; }set{this.enterForeColor = value;this.ForeColor = value;}}public Color LeftForeColor{get { return leftForeColor; }set{this.leftForeColor = value;this.ForeColor = value;}}[DefaultValue(typeof(Color), "51, 161, 224")]//  [DefaultValue(typeof(Color), "220, 80, 80")]//  [DefaultValue(typeof(Color), "251, 161, 0")]protected override void OnMouseEnter(EventArgs e)//鼠标进入时{base.OnMouseEnter(e);this.ForeColor = this.EnterForeColor;}protected override void OnMouseLeave(EventArgs e)//鼠标离开{base.OnMouseLeave(e);this.ForeColor = this.LeftForeColor;}protected override void OnPaint(System.Windows.Forms.PaintEventArgs e){base.OnPaint(e);base.OnPaintBackground(e);e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;e.Graphics.CompositingQuality = CompositingQuality.HighQuality;e.Graphics.InterpolationMode = InterpolationMode.HighQualityBilinear;e.Graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);var path = GetRoundedRectPath(rect);this.Region = new Region(path);//var pa = RectPath(rect);//this.Region = new Region(pa);Color baseColor = this.BackColor;using (SolidBrush b = new SolidBrush(baseColor)){e.Graphics.FillPath(b, path);//e.Graphics.FillPath(b, pa);System.Drawing.Font fo = new System.Drawing.Font(this.Font.Name, this.Font.Size);Brush brush = new SolidBrush(this.ForeColor);Pen penn = new Pen(brush, 3);StringFormat gs = new StringFormat();gs.Alignment = StringAlignment.Center; //居中gs.LineAlignment = StringAlignment.Center;//垂直居中e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;e.Graphics.DrawString(this.Text, fo, brush, rect, gs);}}private GraphicsPath RectPath(Rectangle re){GraphicsPath path = new GraphicsPath();Point[] ps = new Point[4];ps[0] = new Point(this.Width / 5, this.Height / 5);ps[1] = new Point(4 * this.Width / 5, this.Height / 5);ps[2] = new Point(this.Width / 5, 4 * this.Height / 5);ps[3] = new Point(4 * this.Width / 5, 4 * this.Height / 5);path.AddLines(ps);path.CloseFigure();return path;}private GraphicsPath GetRoundedRectPath(Rectangle rect){Rectangle arcRect = new Rectangle(rect.Location, new System.Drawing.Size(this.Height, this.Height));GraphicsPath path = new GraphicsPath();Point[] p = new Point[12];if (Isleft == true){p[0] = new Point(2 * this.Width / 5, 0);p[1] = new Point(0, this.Height / 2);p[2] = new Point(2 * this.Width / 5, this.Height);p[3] = new Point(this.Width, 0);p[4] = new Point(4 * this.Width / 5, this.Height / 4);p[5] = new Point(4 * this.Width / 5, 3 * this.Height / 4);p[6] = new Point(this.Width, this.Height);}else{p[0] = new Point(3 * this.Width / 5, 0);p[1] = new Point(this.Width, this.Height / 2);p[2] = new Point(3 * this.Width / 5, this.Height);p[3] = new Point(0, 0);p[4] = new Point(1 * this.Width / 5, this.Height / 4);p[5] = new Point(1 * this.Width / 5, 3 * this.Height / 4);p[6] = new Point(0, this.Height);}path.AddLine(p[0], p[1]);path.AddLine(p[1], p[2]);path.AddBezier(p[6], p[5], p[4], p[3]);path.CloseFigure();return path;}}

注意：以上是实现如图showButton5所示形状的控件，以下是实现roundButton1圆角按钮

2:：同样，我们可以更改OnPaint()的内容，将控件改成圆角形状，这里我们需要给自定义控件添加一个新属性radius，表示圆角曲度，曲度越大控件越趋近于圆形。

属性设置：

private int radius;//半径
public int Radius{set{radius = value;this.Invalidate();}get{return radius;}}

3：重新更改的OnPaint():

 protected override void OnPaint(System.Windows.Forms.PaintEventArgs e){base.OnPaint(e);base.OnPaintBackground(e);e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;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);using (SolidBrush b = new SolidBrush(this.backColor)){e.Graphics.FillPath(b, path);System.Drawing.Font fo = new System.Drawing.Font(this.Font.Name,this.Font.Size);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);}}private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius){int diameter = radius;Rectangle arcRect = new Rectangle(rect.Location, new System.Drawing.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;}

程序写到这样，也算是到此为止了吧！
everybody，明天见！

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C#winform之自定义按钮形状（初级版）

一、前情回顾

二、实现效果

三、实现过程

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