[游戏开发]C#自定义Button实现源码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Text;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        
        public partial class ButtonEx : Button
        {
            public ButtonEx() {
                //首先开启双缓冲，防止闪烁
                this.SetStyle(ControlStyles.UserPaint, true);
                this.SetStyle(ControlStyles.ResizeRedraw, true);
                this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
                this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
                this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
                this.BackColor = Color.Transparent;
            }
            //用来标示是否鼠标正在悬浮在按钮上  true:悬浮在按钮上 false:鼠标离开了按钮
            private bool BIsHover;
            //用来标示是否鼠标点击了按钮  true：按下了按钮 false：松开了按钮
            private bool BIsDown;
 
            //重载鼠标悬浮的事件
            protected override void OnMouseEnter(EventArgs e) {
                //当鼠标进入控件时，标示变量为进入了控件
                BIsHover = true;
                //刷新面板触发OnPaint重绘
                this.Invalidate();
                base.OnMouseEnter(e);
            }
 
            //重载鼠标离开的事件
            protected override void OnMouseLeave(EventArgs e) {
                //当鼠标离开控件时，标示变量为离开了控件
                BIsHover = false;
                //刷新面板触发OnPaint重绘
                this.Invalidate();
                base.OnMouseLeave(e);
            }
 
            //重载鼠标按下的事件
            protected override void OnMouseDown(MouseEventArgs mevent) {
                //当鼠标按下控件时，标示变量为按下了控件
                BIsDown = true;
                //刷新面板触发OnPaint重绘
                this.Invalidate();
                base.OnMouseDown(mevent);
            }
 
            //重载鼠标松开的事件
            protected override void OnMouseUp(MouseEventArgs mevent) {
                //当鼠标松开时，标示变量为按下并松开了控件
                BIsDown = false;
                //刷新面板触发OnPaint重绘
                this.Invalidate();
                base.OnMouseUp(mevent);
            }
 
            //重载绘画事件
            protected override void OnPaint(PaintEventArgs pevent) {
                base.OnPaint(pevent);
                //因为上面调用了base会绘制原生控件 重刷一下背景清掉原生绘制 不然自己绘制的是重叠在原生绘制上
                base.OnPaintBackground(pevent);
                //得到绘画句柄
                Graphics GP = pevent.Graphics;
                //定义字体格式
                StringFormat SFont = new StringFormat();
                SFont.Alignment = StringAlignment.Center;
                SFont.LineAlignment = StringAlignment.Center;
                //处理热键 当Alt点下时
                SFont.HotkeyPrefix = this.ShowKeyboardCues ? HotkeyPrefix.Show : HotkeyPrefix.Hide;
                //判断使用什么资源图
                Bitmap bmpDraw = Properties.Resources.normal;
                //如果禁用了，则使用禁用时的样式图片绘制，否则调用其他满足条件的样式图片绘制
                if (!this.Enabled) bmpDraw = Properties.Resources.gray;
                else if (BIsDown) bmpDraw = Properties.Resources.down;
                else if (BIsHover) bmpDraw = Properties.Resources.high;
                else if (this.Focused) bmpDraw = Properties.Resources.focus;
                RenderBackground(GP, bmpDraw, this.ClientRectangle);
                //如果禁用了
                if (!this.Enabled) {
                    //则绘制双重阴影文字
                    GP.DrawString(this.Text, this.Font, Brushes.White, this.ClientRectangle, SFont);
                    GP.TranslateTransform(-1, -1);//左上移动一个单位坐标系
                    GP.DrawString(this.Text, this.Font, Brushes.DarkGray, this.ClientRectangle, SFont);
                    GP.ResetTransform();
                    return;
                }
                //否则，默认绘制正常字体
                using (SolidBrush sb = new SolidBrush(this.ForeColor)) {
                    GP.DrawString(this.Text, this.Font, sb, this.ClientRectangle, SFont);
                }
            }

            
        public static void RenderBackground(Graphics GP, Image img, Rectangle rect) {
            //填充四个角
            GP.DrawImage(img, new Rectangle(rect.X, rect.Y, 5, 5), 
                new Rectangle(0, 0, 5, 5), GraphicsUnit.Pixel);
            GP.DrawImage(img, new Rectangle(rect.Right - 5, rect.Y, 5, 5), 
                new Rectangle(img.Width - 5, 0, 5, 5), GraphicsUnit.Pixel);
            GP.DrawImage(img, new Rectangle(rect.X, rect.Bottom - 5, 5, 5), 
                new Rectangle(0, img.Height - 5, 5, 5), GraphicsUnit.Pixel);
            GP.DrawImage(img, new Rectangle(rect.Right - 5, rect.Bottom - 5, 5, 5), 
                new Rectangle(img.Width - 5, img.Height - 5, 5, 5), GraphicsUnit.Pixel);
            //四边
            GP.DrawImage(img, new Rectangle(rect.X, rect.Y + 5, 5, rect.Height - 10), 
                new Rectangle(0, 5, 5, img.Height - 10), GraphicsUnit.Pixel);
            GP.DrawImage(img, new Rectangle(rect.X + 5, rect.Y, rect.Width - 10, 5), 
                new Rectangle(5, 0, img.Width - 10, 5), GraphicsUnit.Pixel);
            GP.DrawImage(img, new Rectangle(rect.Right - 5, rect.Y + 5, 5, rect.Height - 10), 
                new Rectangle(img.Width - 5, 5, 5, img.Height - 10), GraphicsUnit.Pixel);
            GP.DrawImage(img, new Rectangle(rect.X + 5, rect.Bottom - 5, rect.Width - 10, 5), 
                new Rectangle(5, img.Height - 5, img.Width - 10, 5), GraphicsUnit.Pixel);
            //中间
            GP.DrawImage(img, 
                new Rectangle(rect.X + 5, rect.Y + 5, rect.Width - 10, rect.Height - 10), 
                new Rectangle(5, 5, img.Width - 10, img.Height - 10), GraphicsUnit.Pixel);
 
        }


        }

    }
}

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