using System;
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using System.ComponentModel;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Windows.Forms;
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namespace WinCustControls
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{
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[DefaultEvent("CheckedChanged")]
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public partial class USwitch : UserControl
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{
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public USwitch()
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{
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InitializeComponent();
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SetStyle(ControlStyles.Selectable, true);//控件可以接收焦点
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SetStyle(ControlStyles.AllPaintingInWmPaint, true);//忽略窗口消息，减少闪烁
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SetStyle(ControlStyles.OptimizedDoubleBuffer, true);//绘制到缓冲区，减少闪烁
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SetStyle(ControlStyles.UserPaint, true);//控件由其自身而不是操作系统绘制
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SetStyle(ControlStyles.ResizeRedraw, true);//控件调整其大小时重绘
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SetStyle(ControlStyles.SupportsTransparentBackColor, true);//支持透明背景
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MouseDown += USwitch_MouseDown;
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}
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/// <summary>
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/// 引发CheckedChanged事件
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void USwitch_MouseDown(object sender, MouseEventArgs e)
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{
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CheckedChanged?.Invoke(this, new EventArgs());
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}
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[Description("开关状态值改变时触发")]
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public event EventHandler CheckedChanged;
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private Color trueColor = Color.DarkTurquoise;
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[DefaultValue(typeof(Color), "DarkTurquoise"), Description("状态Checked为True时的背景色")]
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public Color TrueColor
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{
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get { return trueColor; }
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set
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{
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trueColor = value;
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Invalidate();
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}
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}
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private Color falseColor = Color.Gray;
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[DefaultValue(typeof(Color), "Gray"), Description("状态Checked为False时的背景色")]
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public Color FalseColor
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{
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get { return falseColor; }
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set
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{
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falseColor = value;
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Invalidate();
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}
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}
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private bool mChecked = false;
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[DefaultValue(typeof(bool), "False"), Description("开关状态值")]
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public bool Checked
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{
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get { return mChecked; }
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set
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{
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mChecked = value;
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Invalidate();
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}
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}
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private string[] texts;
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[Description("开关两种状态的文本，必须是长度为2的字符串数组")]
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public string[] Texts
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{
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get { return texts; }
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set
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{
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texts = value;
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Invalidate();
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}
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}
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private SwitchType switchType = SwitchType.Ellipse;
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[DefaultValue(typeof(SwitchType), "Ellipse"), Description("开关样式")]
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public SwitchType SwitchType
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{
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get { return switchType; }
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set
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{
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switchType = value;
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Invalidate();
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}
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}
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public override Font Font
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{
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get => base.Font;
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set
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{
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base.Font = value;
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Invalidate();
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}
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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base.OnPaint(e);
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Graphics g = e.Graphics;
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g.SmoothingMode = SmoothingMode.AntiAlias;
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//背景填充色
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var fillColor = mChecked ? trueColor : falseColor;
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//外观形状的路径
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GraphicsPath path = new GraphicsPath();
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if (switchType == SwitchType.Ellipse)
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{
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//上边直线
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path.AddLine(Height / 2, 1, Width - Height / 2, 1);
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//右边半圆弧
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path.AddArc(Width - Height - 1, 1, Height - 2, Height - 2, -90, 180);
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//下边直线 右----左
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path.AddLine(Width - Height / 2, Height - 1, Height / 2, Height - 1);
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//左边半圆弧
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path.AddArc(1, 1, Height - 2, Height - 2, 90, 180);
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g.FillPath(new SolidBrush(fillColor), path);
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//开关的文本
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string strText = "";
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if (texts != null && texts.Length == 2)
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{
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if (mChecked)
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strText = texts[0];
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else
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strText = texts[1];
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}
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if (mChecked)
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{
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//填充右边正圆 直径 Height-2-4
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g.FillEllipse(Brushes.White, new Rectangle(Width - Height - 1 + 2, 1 + 2, Height - 2 - 4, Height - 2 - 4));
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if (string.IsNullOrEmpty(strText))//没有文本
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{
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//左边就画一个小圆，边框为白色 直径 ：右边圆的一半
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g.DrawEllipse(new Pen(Color.White, 2), new Rectangle((Height - 2 - 4) / 2 - ((Height - 2 - 4) / 4), (Height - 2 - (Height - 2 - 4) / 2) / 2 + 1, (Height - 2 - 4) / 2, (Height - 2 - 4) / 2));
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}
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else
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{
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//获取文本尺寸
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SizeF sizeF = g.MeasureString(strText.Replace(" ", "A"), Font);
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//计算文本绘制的位置的矩形的左上角y坐标值
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int textY = (Height - (int)sizeF.Height) / 2 + 2;
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//x坐标 1/2半径处
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g.DrawString(strText, Font, Brushes.White, new Point((Height - 2 - 4) / 2, textY));
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}
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}
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else //Checked 为False
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{
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//填充左边正圆
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g.FillEllipse(Brushes.White, new Rectangle(1 + 2, 1 + 2, this.Height - 2 - 4, this.Height - 2 - 4));
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if (string.IsNullOrEmpty(strText))//没有文本
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{
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//右边就画一个小圆，边框为白色 直径 ：左边圆的一半
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g.DrawEllipse(new Pen(Color.White, 2), new Rectangle(this.Width - 2 - (this.Height - 2 - 4) / 2 - ((this.Height - 2 - 4) / 2) / 2, (this.Height - 2 - (this.Height - 2 - 4) / 2) / 2 + 1, (this.Height - 2 - 4) / 2, (this.Height - 2 - 4) / 2));
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}
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else
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{
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//获取文本尺寸
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SizeF sizeF = g.MeasureString(strText.Replace(" ", "A"), Font);
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//计算文本绘制的位置的矩形的左上角y坐标值
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int textY = (Height - (int)sizeF.Height) / 2 + 2;
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//x坐标 1/2半径
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g.DrawString(strText, Font, Brushes.White, new Point(this.Width - 2 - this.Height / 2 - ((int)sizeF.Width) + 4, textY));
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}
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}
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}
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else if (switchType == SwitchType.Quadriateral)//四边形
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{
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//圆角正方形边长
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int intRadius = 5;
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//左上角圆弧
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path.AddArc(0, 0, intRadius, intRadius, 180f, 90f);
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//右上角圆弧
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path.AddArc(this.Width - intRadius - 1, 0, intRadius, intRadius, 270f, 90f);
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//右下角圆弧
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path.AddArc(this.Width - intRadius - 1, this.Height - intRadius - 1, intRadius, intRadius, 0f, 90f);
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//左下角圆弧
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path.AddArc(0, this.Height - intRadius - 1, intRadius, intRadius, 90f, 90f);
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//填充圆角矩形
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g.FillPath(new SolidBrush(fillColor), path);
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//获取文本
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string strText = string.Empty;
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if (texts != null && texts.Length == 2)
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{
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if (mChecked)
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{
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strText = texts[0];
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}
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else
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{
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strText = texts[1];
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}
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}
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if (mChecked)
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{
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//右边正方形圆角
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GraphicsPath path2 = new GraphicsPath();
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//左上角圆弧
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path2.AddArc(this.Width - this.Height - 1 + 2, 1 + 2, intRadius, intRadius, 180f, 90f);
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//右上角圆弧
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path2.AddArc(this.Width - 1 - 2 - intRadius, 1 + 2, intRadius, intRadius, 270f, 90f);
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//右下角圆弧
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path2.AddArc(this.Width - 1 - 2 - intRadius, this.Height - 2 - intRadius - 1, intRadius, intRadius, 0f, 90f);
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//右下角圆弧
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path2.AddArc(this.Width - this.Height - 1 + 2, this.Height - 2 - intRadius - 1, intRadius, intRadius, 90f, 90f);
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//填充圆角正方形
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g.FillPath(Brushes.White, path2);
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if (string.IsNullOrEmpty(strText))
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{
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//左边画个小圆
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//小圆所在矩形左上角坐标 ：x 1/2边长-1/2小圆半径
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//y: 1/2边长-1/2小圆半径+1
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//半径：1/2 正方形边长
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g.DrawEllipse(new Pen(Color.White, 2), new Rectangle((this.Height - 2 - 4) / 2 - ((this.Height - 2 - 4) / 2) / 2, (this.Height - 2 - (this.Height - 2 - 4) / 2) / 2 + 1, (this.Height - 2 - 4) / 2, (this.Height - 2 - 4) / 2));
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}
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else
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{
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//画文本
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System.Drawing.SizeF sizeF = g.MeasureString(strText.Replace(" ", "A"), Font);
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//y坐标
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int intTextY = (this.Height - (int)sizeF.Height) / 2 + 2;
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//x:1/2边长处
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g.DrawString(strText, Font, Brushes.White, new Point((this.Height - 2 - 4) / 2, intTextY));
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}
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}
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else//画关的外观
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{
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//圆角正方形路径 左边
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GraphicsPath path2 = new GraphicsPath();
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path2.AddArc(1 + 2, 1 + 2, intRadius, intRadius, 180f, 90f);
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path2.AddArc(this.Height - 2 - intRadius, 1 + 2, intRadius, intRadius, 270f, 90f);
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path2.AddArc(this.Height - 2 - intRadius, this.Height - 2 - intRadius - 1, intRadius, intRadius, 0f, 90f);
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path2.AddArc(1 + 2, this.Height - 2 - intRadius - 1, intRadius, intRadius, 90f, 90f);
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//填充圆角正方形
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g.FillPath(Brushes.White, path2);
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if (string.IsNullOrEmpty(strText))
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{
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//无文本，画右边小圆
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//小圆所在矩形左上角坐标 ：x 宽度-2-1/2边长-1/2小圆半径
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//y: 1/2边长-1/2小圆半径+1
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//半径：1/2 正方形边长
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g.DrawEllipse(new Pen(Color.White, 2), new Rectangle(this.Width - 2 - (this.Height - 2 - 4) / 2 - ((this.Height - 2 - 4) / 2) / 2, (this.Height - 2 - (this.Height - 2 - 4) / 2) / 2 + 1, (this.Height - 2 - 4) / 2, (this.Height - 2 - 4) / 2));
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}
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else
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{
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//画文本
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System.Drawing.SizeF sizeF = g.MeasureString(strText.Replace(" ", "A"), Font);
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//y坐标
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int intTextY = (this.Height - (int)sizeF.Height) / 2 + 2;
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//x坐标 宽-2-1/2正方形边长-文字宽度+4
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g.DrawString(strText, Font, Brushes.White, new Point(this.Width - 2 - (this.Height - 2 - 4) / 2 - (int)sizeF.Width + 4, intTextY));
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}
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}
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}
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else //线型
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{
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//线高
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int intLineHeight = (this.Height - 2 - 4) / 2;
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// 上边直线 点 ：高度,(高度-线高)/2 点：宽-高/2, (高度-线高)/2
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path.AddLine(new Point(this.Height / 2, (this.Height - intLineHeight) / 2), new Point(this.Width - this.Height / 2, (this.Height - intLineHeight) / 2));
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//右边半圆弧 半径是 1/2线高
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path.AddArc(new Rectangle(this.Width - this.Height / 2 - intLineHeight - 1, (this.Height - intLineHeight) / 2, intLineHeight, intLineHeight), -90, 180);
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//下边直线
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path.AddLine(new Point(this.Width - this.Height / 2, (this.Height - intLineHeight) / 2 + intLineHeight), new Point(this.Width - this.Height / 2, (this.Height - intLineHeight) / 2 + intLineHeight));
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//左边半圆弧
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path.AddArc(new Rectangle(this.Height / 2, (this.Height - intLineHeight) / 2, intLineHeight, intLineHeight), 90, 180);
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//填充线
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g.FillPath(new SolidBrush(fillColor), path);
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if (mChecked)//绘制开时的外观
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{
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//填充右边外圆
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g.FillEllipse(new SolidBrush(fillColor), new Rectangle(this.Width - this.Height - 1 + 2, 1 + 2, this.Height - 2 - 4, this.Height - 2 - 4));
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//填充右边内圆
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//x坐标：宽-2-1/2外圆半径-1/2内圆半径-4 y坐标：高-2-1/2内圆半径+1
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//内圆直径：(this.Height - 2 - 4) / 2 (高-2-4)/2
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g.FillEllipse(Brushes.White, new Rectangle(this.Width - 2 - (this.Height - 2 - 4) / 2 - ((this.Height - 2 - 4) / 2) / 2 - 4, (this.Height - 2 - (this.Height - 2 - 4) / 2) / 2 + 1, (this.Height - 2 - 4) / 2, (this.Height - 2 - 4) / 2));
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}
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else //关时的外观
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{
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//填充左边外圆
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g.FillEllipse(new SolidBrush(fillColor), new Rectangle(1 + 2, 1 + 2, this.Height - 2 - 4, this.Height - 2 - 4));
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//填充左贺内圆
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//x坐标：1/2外圆半径-1/2内圆半径+4 y坐标：1/2外圆半径-1/2内圆半径+1
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//内圆直径：(this.Height - 2 - 4) / 2 (高-2-4)/2
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g.FillEllipse(Brushes.White, new Rectangle((this.Height - 2 - 4) / 2 - ((this.Height - 2 - 4) / 2) / 2 + 4, (this.Height - 2 - (this.Height - 2 - 4) / 2) / 2 + 1, (this.Height - 2 - 4) / 2, (this.Height - 2 - 4) / 2));
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}
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}
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}
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}
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public enum SwitchType
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{
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//圆形
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Ellipse,
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//四边形
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Quadriateral,
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//线形
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Line
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}
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}
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