前提

入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。

GitHub：https://github.com/kwwwvagaa/NetWinformControl

码云：https://gitee.com/kwwwvagaa/net_winform_custom_control.git

如果觉得写的还行，请点个 star 支持一下吧

欢迎前来交流探讨：企鹅群568015492

麻烦博客下方点个【推荐】，谢谢

NuGet

Install-Package HZH_Controls

用处及效果

准备工作

依然用GDI+，请自行百度了解

开始

添加一个类UCArrow，继承UserControl

添加枚举，控制方向

 1 /// <summary>2     /// Enum ArrowDirection3     /// </summary>4     public enum ArrowDirection5     {6         /// <summary>7         /// The left8         /// </summary>9         Left,
10         /// <summary>
11         /// The right
12         /// </summary>
13         Right,
14         /// <summary>
15         /// The top
16         /// </summary>
17         Top,
18         /// <summary>
19         /// The bottom
20         /// </summary>
21         Bottom,
22         /// <summary>
23         /// The left right
24         /// </summary>
25         Left_Right,
26         /// <summary>
27         /// The top bottom
28         /// </summary>
29         Top_Bottom
30     }

一些属性

  1  /// <summary>2         /// The arrow color3         /// </summary>4         private Color arrowColor = Color.FromArgb(255, 77, 59);5 6         /// <summary>7         /// Gets or sets the color of the arrow.8         /// </summary>9         /// <value>The color of the arrow.</value>10         [Description("箭头颜色"), Category("自定义")]11         public Color ArrowColor12         {13             get { return arrowColor; }14             set15             {16                 arrowColor = value;17                 Refresh();18             }19         }20 21         /// <summary>22         /// The border color23         /// </summary>24         private Color? borderColor = null;25 26         /// <summary>27         /// Gets or sets the color of the border.28         /// </summary>29         /// <value>The color of the border.</value>30         [Description("箭头边框颜色，为空则无边框"), Category("自定义")]31         public Color? BorderColor32         {33             get { return borderColor; }34             set35             {36                 borderColor = value;37                 Refresh();38             }39         }40 41         /// <summary>42         /// The direction43         /// </summary>44         private ArrowDirection direction = ArrowDirection.Right;45 46         /// <summary>47         /// Gets or sets the direction.48         /// </summary>49         /// <value>The direction.</value>50         [Description("箭头方向"), Category("自定义")]51         public ArrowDirection Direction52         {53             get { return direction; }54             set55             {56                 direction = value;57                 ResetPath();58                 Refresh();59             }60         }61         /// <summary>62         /// 获取或设置控件显示的文字的字体。63         /// </summary>64         /// <value>The font.</value>65         /// <PermissionSet>66         ///   <IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />67         ///   <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />68         ///   <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode, ControlEvidence" />69         ///   <IPermission class="System.Diagnostics.PerformanceCounterPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />70         /// </PermissionSet>71         public override Font Font72         {73             get74             {75                 return base.Font;76             }77             set78             {79                 base.Font = value;80                 Refresh();81             }82         }83         /// <summary>84         /// 获取或设置控件的前景色。85         /// </summary>86         /// <value>The color of the fore.</value>87         /// <PermissionSet>88         ///   <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />89         /// </PermissionSet>90         public override Color ForeColor91         {92             get93             {94                 return base.ForeColor;95             }96             set97             {98                 base.ForeColor = value;99                 Refresh();
100             }
101         }
102         /// <summary>
103         /// The text
104         /// </summary>
105         private string text;
106         /// <summary>
107         /// Gets or sets the text.
108         /// </summary>
109         /// <value>The text.</value>
110         [Bindable(true)]
111         [Browsable(true)]
112         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
113         [EditorBrowsable(EditorBrowsableState.Always)]
114         [Localizable(true)]
115         [Description("箭头文字"), Category("自定义")]
116         public override string Text
117         {
118             get
119             {
120                 return text;
121             }
122             set
123             {
124                 text = value;
125                 Refresh();
126             }
127         }
128         /// <summary>
129         /// The m path
130         /// </summary>
131         GraphicsPath m_path;

根据方向和大小设置path

 1   private void ResetPath()2         {3             Point[] ps = null;4             switch (direction)5             {6                 case ArrowDirection.Left:7                     ps = new Point[] 8                     { 9                         new Point(0,this.Height/2),
10                         new Point(40,0),
11                         new Point(40,this.Height/4),
12                         new Point(this.Width-1,this.Height/4),
13                         new Point(this.Width-1,this.Height-this.Height/4),
14                         new Point(40,this.Height-this.Height/4),
15                         new Point(40,this.Height),
16                         new Point(0,this.Height/2)
17                     };
18                     break;
19                 case ArrowDirection.Right:
20                     ps = new Point[]
21                     {
22                         new Point(0,this.Height/4),
23                         new Point(this.Width-40,this.Height/4),
24                         new Point(this.Width-40,0),
25                         new Point(this.Width-1,this.Height/2),
26                         new Point(this.Width-40,this.Height),
27                         new Point(this.Width-40,this.Height-this.Height/4),
28                         new Point(0,this.Height-this.Height/4),
29                         new Point(0,this.Height/4)
30                     };
31                     break;
32                 case ArrowDirection.Top:
33                     ps = new Point[]
34                     {
35                        new Point(this.Width/2,0),
36                        new Point(this.Width,40),
37                        new Point(this.Width-this.Width/4,40),
38                        new Point(this.Width-this.Width/4,this.Height-1),
39                        new Point(this.Width/4,this.Height-1),
40                        new Point(this.Width/4,40),
41                        new Point(0,40),
42                        new Point(this.Width/2,0),
43                     };
44                     break;
45                 case ArrowDirection.Bottom:
46                     ps = new Point[]
47                     {
48                        new Point(this.Width-this.Width/4,0),
49                        new Point(this.Width-this.Width/4,this.Height-40),
50                        new Point(this.Width,this.Height-40),
51                        new Point(this.Width/2,this.Height-1),
52                        new Point(0,this.Height-40),
53                        new Point(this.Width/4,this.Height-40),
54                        new Point(this.Width/4,0),
55                        new Point(this.Width-this.Width/4,0),
56                     };
57                     break;
58                 case ArrowDirection.Left_Right:
59                     ps = new Point[]
60                     {
61                         new Point(0,this.Height/2),
62                         new Point(40,0),
63                         new Point(40,this.Height/4),
64                         new Point(this.Width-40,this.Height/4),
65                         new Point(this.Width-40,0),
66                         new Point(this.Width-1,this.Height/2),
67                         new Point(this.Width-40,this.Height),
68                         new Point(this.Width-40,this.Height-this.Height/4),
69                         new Point(40,this.Height-this.Height/4),
70                         new Point(40,this.Height),
71                         new Point(0,this.Height/2),
72                     };
73                     break;
74                 case ArrowDirection.Top_Bottom:
75                     ps = new Point[]
76                     {
77                        new Point(this.Width/2,0),
78                        new Point(this.Width,40),
79                        new Point(this.Width-this.Width/4,40),
80                        new Point(this.Width-this.Width/4,this.Height-40),
81                        new Point(this.Width,this.Height-40),
82                        new Point(this.Width/2,this.Height-1),
83                        new Point(0,this.Height-40),
84                        new Point(this.Width/4,this.Height-40),
85                        new Point(this.Width/4,40),
86                        new Point(0,40),
87                        new Point(this.Width/2,0),
88                     };
89                     break;
90             }
91             m_path = new GraphicsPath();
92             m_path.AddLines(ps);
93             m_path.CloseAllFigures();
94         }

重绘

 1   protected override void OnPaint(PaintEventArgs e)2         {3             base.OnPaint(e);4             var g = e.Graphics;5             g.SetGDIHigh();6 7             g.FillPath(new SolidBrush(arrowColor), m_path);8 9             if (borderColor != null && borderColor != Color.Empty)
10                 g.DrawPath(new Pen(new SolidBrush(borderColor.Value)), m_path);
11             if (!string.IsNullOrEmpty(text))
12             {
13                 var size = g.MeasureString(Text, Font);
14                 g.DrawString(Text, Font, new SolidBrush(ForeColor), new PointF((this.Width - size.Width) / 2, (this.Height - size.Height) / 2));
15             }
16         }

完整代码

// ***********************************************************************
// Assembly         : HZH_Controls
// Created          : 2019-09-10
//
// ***********************************************************************
// <copyright file="UCArrow.cs">
//     Copyright by Huang Zhenghui(黄正辉) All, QQ group:568015492 QQ:623128629 Email:623128629@qq.com
// </copyright>
//
// Blog: https://www.cnblogs.com/bfyx
// GitHub：https://github.com/kwwwvagaa/NetWinformControl
// gitee：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
//
// If you use this code, please keep this note.
// ***********************************************************************
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.ComponentModel;namespace HZH_Controls.Controls
{/// <summary>/// Class UCArrow./// Implements the <see cref="System.Windows.Forms.UserControl" />/// </summary>/// <seealso cref="System.Windows.Forms.UserControl" />public class UCArrow : UserControl{/// <summary>/// The arrow color/// </summary>private Color arrowColor = Color.FromArgb(255, 77, 59);/// <summary>/// Gets or sets the color of the arrow./// </summary>/// <value>The color of the arrow.</value>[Description("箭头颜色"), Category("自定义")]public Color ArrowColor{get { return arrowColor; }set{arrowColor = value;Refresh();}}/// <summary>/// The border color/// </summary>private Color? borderColor = null;/// <summary>/// Gets or sets the color of the border./// </summary>/// <value>The color of the border.</value>[Description("箭头边框颜色，为空则无边框"), Category("自定义")]public Color? BorderColor{get { return borderColor; }set{borderColor = value;Refresh();}}/// <summary>/// The direction/// </summary>private ArrowDirection direction = ArrowDirection.Right;/// <summary>/// Gets or sets the direction./// </summary>/// <value>The direction.</value>[Description("箭头方向"), Category("自定义")]public ArrowDirection Direction{get { return direction; }set{direction = value;ResetPath();Refresh();}}/// <summary>/// 获取或设置控件显示的文字的字体。/// </summary>/// <value>The font.</value>/// <PermissionSet>///   <IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />///   <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />///   <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode, ControlEvidence" />///   <IPermission class="System.Diagnostics.PerformanceCounterPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />/// </PermissionSet>public override Font Font{get{return base.Font;}set{base.Font = value;Refresh();}}/// <summary>/// 获取或设置控件的前景色。/// </summary>/// <value>The color of the fore.</value>/// <PermissionSet>///   <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />/// </PermissionSet>public override Color ForeColor{get{return base.ForeColor;}set{base.ForeColor = value;Refresh();}}/// <summary>/// The text/// </summary>private string text;/// <summary>/// Gets or sets the text./// </summary>/// <value>The text.</value>[Bindable(true)][Browsable(true)][DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)][EditorBrowsable(EditorBrowsableState.Always)][Localizable(true)][Description("箭头文字"), Category("自定义")]public override string Text{get{return text;}set{text = value;Refresh();}}/// <summary>/// The m path/// </summary>GraphicsPath m_path;/// <summary>/// Initializes a new instance of the <see cref="UCArrow"/> class./// </summary>public UCArrow(){this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);this.SetStyle(ControlStyles.DoubleBuffer, true);this.SetStyle(ControlStyles.ResizeRedraw, true);this.SetStyle(ControlStyles.Selectable, true);this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);this.SetStyle(ControlStyles.UserPaint, true);this.ForeColor = Color.White;this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;this.SizeChanged += UCArrow_SizeChanged;this.Size = new Size(100, 50);}/// <summary>/// Handles the SizeChanged event of the UCArrow control./// </summary>/// <param name="sender">The source of the event.</param>/// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>void UCArrow_SizeChanged(object sender, EventArgs e){ResetPath();}/// <summary>/// Resets the path./// </summary>private void ResetPath(){Point[] ps = null;switch (direction){case ArrowDirection.Left:ps = new Point[] { new Point(0,this.Height/2),new Point(40,0),new Point(40,this.Height/4),new Point(this.Width-1,this.Height/4),new Point(this.Width-1,this.Height-this.Height/4),new Point(40,this.Height-this.Height/4),new Point(40,this.Height),new Point(0,this.Height/2)};break;case ArrowDirection.Right:ps = new Point[] {new Point(0,this.Height/4),new Point(this.Width-40,this.Height/4),new Point(this.Width-40,0),new Point(this.Width-1,this.Height/2),new Point(this.Width-40,this.Height),new Point(this.Width-40,this.Height-this.Height/4),                      new Point(0,this.Height-this.Height/4),new Point(0,this.Height/4)};break;case ArrowDirection.Top:ps = new Point[] {new Point(this.Width/2,0),new Point(this.Width,40),new Point(this.Width-this.Width/4,40),new Point(this.Width-this.Width/4,this.Height-1),new Point(this.Width/4,this.Height-1),new Point(this.Width/4,40),new Point(0,40),new Point(this.Width/2,0),};break;case ArrowDirection.Bottom:ps = new Point[] {new Point(this.Width-this.Width/4,0),new Point(this.Width-this.Width/4,this.Height-40),new Point(this.Width,this.Height-40),new Point(this.Width/2,this.Height-1),new Point(0,this.Height-40),new Point(this.Width/4,this.Height-40),new Point(this.Width/4,0),new Point(this.Width-this.Width/4,0),                      };break;case ArrowDirection.Left_Right:ps = new Point[] { new Point(0,this.Height/2),new Point(40,0),new Point(40,this.Height/4),new Point(this.Width-40,this.Height/4),new Point(this.Width-40,0),new Point(this.Width-1,this.Height/2),new Point(this.Width-40,this.Height),new Point(this.Width-40,this.Height-this.Height/4),new Point(40,this.Height-this.Height/4),new Point(40,this.Height),new Point(0,this.Height/2),                       };break;case ArrowDirection.Top_Bottom:ps = new Point[] {new Point(this.Width/2,0),new Point(this.Width,40),new Point(this.Width-this.Width/4,40),new Point(this.Width-this.Width/4,this.Height-40),new Point(this.Width,this.Height-40),new Point(this.Width/2,this.Height-1),new Point(0,this.Height-40),new Point(this.Width/4,this.Height-40),new Point(this.Width/4,40),new Point(0,40),new Point(this.Width/2,0),                      };break;}m_path = new GraphicsPath();m_path.AddLines(ps);m_path.CloseAllFigures();}/// <summary>/// 引发 <see cref="E:System.Windows.Forms.Control.Paint" /> 事件。/// </summary>/// <param name="e">包含事件数据的 <see cref="T:System.Windows.Forms.PaintEventArgs" />。</param>protected override void OnPaint(PaintEventArgs e){base.OnPaint(e);var g = e.Graphics;g.SetGDIHigh();g.FillPath(new SolidBrush(arrowColor), m_path);if (borderColor != null && borderColor != Color.Empty)g.DrawPath(new Pen(new SolidBrush(borderColor.Value)), m_path);if (!string.IsNullOrEmpty(text)){var size = g.MeasureString(Text, Font);g.DrawString(Text, Font, new SolidBrush(ForeColor), new PointF((this.Width - size.Width) / 2, (this.Height - size.Height) / 2));}}}/// <summary>/// Enum ArrowDirection/// </summary>public enum ArrowDirection{/// <summary>/// The left/// </summary>Left,/// <summary>/// The right/// </summary>Right,/// <summary>/// The top/// </summary>Top,/// <summary>/// The bottom/// </summary>Bottom,/// <summary>/// The left right/// </summary>Left_Right,/// <summary>/// The top bottom/// </summary>Top_Bottom}
}

最后的话

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（六十三）c#Winform自定义控件-箭头（工业）

前提

NuGet

目录

用处及效果

准备工作

开始

最后的话

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