WinForm 基于 GDI+ 自定义控件简单仿 LED 小示例

参考

• 豆包
• https://learn.microsoft.com/zh-cn/previous-versions/visualstudio/visual-studio-2010/a36fascx(v=vs.100)
• https://www.cnblogs.com/lesliexin/p/13265707.html
• https://www.bilibili.com/video/BV1Ug411Q72h

环境

软件/系统	版本	说明
Windows	windows 10 专业版 22H2 64 位操作系统, 基于 x64 的处理器
Microsoft Visual Studio	Community 2022 (64 位) - Current 版本 17.14.10
.NET Framework	4.8

预览

实现功能有：公开控件属性、控件属性更新重绘、控件属性分组与说明、鼠标按下抬起事件等

• 运行界面
  
• 可视化编辑器控件属性
  

正文

1. LyauiBtnControl.cs

   	using System;
   	using System.Collections.Generic;
   	using System.ComponentModel;
   	using System.Data;
   	using System.Drawing;
   	using System.Drawing.Drawing2D;
   	using System.Linq;
   	using System.Text;
   	using System.Windows.Forms;
   
   	namespace DemoControls
   	{
   		public partial class LyauiBtnControl : Control
   		{
   			public LyauiBtnControl()
   			{
   				InitializeComponent();
   			}
   
   			private Color _color = Color.Green;
   			/// <summary>
   			/// 颜色
   			/// </summary>
   			[Category("Settings"), Description("颜色")]
   			public Color Color
   			{
   				get { return _color; }
   				set
   				{
   					_color = value;
   					// 重绘
   					Invalidate();
   				}
   			}
   
   			protected override void OnPaint(PaintEventArgs pe)
   			{
   				base.OnPaint(pe);
   				// 获取画布
   				Graphics g = pe.Graphics;
   				// 防止闪烁
   				g.SmoothingMode = SmoothingMode.AntiAlias;
   				// 画刷
   				using (SolidBrush solidBrush = new SolidBrush(_color))
   				{
   					// 矩形不能够太靠近边框
   					Rectangle rectangle = new Rectangle(1, 1, Width - 2, Height - 2);
   					//g.FillRectangle(solidBrush, rectangle);
   					g.FillEllipse(solidBrush, rectangle);
   				}
   			}
   
   			// 鼠标按下
   			protected override void OnMouseDown(MouseEventArgs e)
   			{
   				base.OnMouseDown(e);
   				// 鼠标按下时触发
   				_color = Color.Blue;
   				Invalidate();
   			}
   			// 鼠标抬起
   			protected override void OnMouseUp(MouseEventArgs e)
   			{
   				base.OnMouseUp(e);
   				// 鼠标抬起时触发
   				_color = Color.Green;
   				Invalidate();
   			}
   
   			//protected override void OnMouseEnter(EventArgs e)
   			//{
   			//    base.OnMouseEnter(e);
   			//    // 鼠标进入时触发
   			//    _color = Color.Red;
   			//    Invalidate();
   			//}
   
   			//// 鼠标移出
   			//protected override void OnMouseLeave(EventArgs e)
   			//{
   			//    base.OnMouseLeave(e);
   			//    // 鼠标移出时触发
   			//    _color = Color.Green;
   			//    Invalidate();
   			//}
   			        /// <summary>
   			/// 界面调整后重绘
   			/// </summary>
   			/// <param name="e"></param>
   			protected override void OnResize(EventArgs e)
   			{
   				base.OnResize(e);
   				// 重绘
   				Invalidate();
   			}
   		}
   	}