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   源码介绍

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

namespace BaiduTabs
{
    class TabButton:Control
    {
         private Image _HoverImage;
         private Image _DownImage;
         private Image _DefaultImage;
         private ButtonStyleShow _ButtonStyleShow=ButtonStyleShow.Default;
         private Boolean _Border = true;
         private Boolean _BorderTop = true;
         private Boolean _BorderLeft = true;
         private Boolean _BorderRigth = true;
         private Boolean _BorderBottom = true;
         private Color _BorderColor = Color.CadetBlue;

        //属性
        [Description("默认背景"), Category("ButtonBG")]
        [DefaultValue(null)]
         public Image DefaultImage { get { return _DefaultImage; } set { _DefaultImage = value; Invalidate(); } }
        [Description("进入背景"), Category("ButtonBG")]
        [DefaultValue(null)]
        public Image HoverImage { get { return _HoverImage; } set { _HoverImage = value; } }
        [Category("ButtonBG")]
        [Description("按下背景")]
        [DefaultValue(null)]
        public Image DownImage { get { return _DownImage; } set { _DownImage = value; } }
        [Category("显示")]
        [Description("样式")]
        [DefaultValue(ButtonStyleShow.Default)]
        public ButtonStyleShow ButtonStyle { get { return _ButtonStyleShow; } set { _ButtonStyleShow = value; Invalidate(); } }
        [Category("边框")]
        [Description("边框")]
        [DefaultValue(true)]
        public Boolean Border { get { return _Border; } set { _Border = value; Invalidate(); } }
        [Category("边框")]
        [Description("上边框")]
        [DefaultValue(true)]
        public Boolean BorderTop { get { return _BorderTop; } set { _BorderTop = value; Invalidate(); } }
        [Category("边框")]
        [Description("下边框")]
        [DefaultValue(true)]
        public Boolean BorderBottom { get { return _BorderBottom; } set { _BorderBottom = value; Invalidate(); } }
        [Category("边框")]
        [Description("左边框")]
        [DefaultValue(true)]
        public Boolean BorderLeft { get { return _BorderLeft; } set { _BorderLeft = value; Invalidate(); } }
        [Category("边框")]
        [Description("右边框")]
        [DefaultValue(true)]
        public Boolean BordeRigth { get { return _BorderRigth; } set { _BorderRigth = value; Invalidate(); } }
        [Category("边框")]
        [Description("边框颜色")]
        [DefaultValue(true)]
        public Color BordeColor { get { return _BorderColor; } set { _BorderColor = value; Invalidate(); } }
        public override string Text { get { return base.Text; } set { base.Text = value; Invalidate(); } }
        //方法
        public TabButton()
        {
            this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true);
            this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
            this.BackColor = Color.Transparent;
            this.Size = new Size(100, 30);
        }
        //枚举显示
        public enum ButtonStyleShow
        {
            Default=0,
            Image=1
        }
        private int show = 0;
        protected override void OnPaint(PaintEventArgs e)
        {
            Graphics cavan=e.Graphics;
            Size textsize = cavan.MeasureString(this.Text, this.Font).ToSize();
            if (show == 0)
            {
                switch (_ButtonStyleShow)
                {
                        case ButtonStyleShow.Default:
                            cavan.FillRectangle(new SolidBrush(this.BackColor), new Rectangle(3, 3, this.Size.Width - 6, this.Size.Height - 6));
                            cavan.DrawString(this.Text, this.Font, new SolidBrush(this.ForeColor), new PointF((this.Size.Width / 2) - (textsize.Width / 2), (this.Size.Height / 2) - (textsize.Height / 2)));
                            if (_Border)
                            {
                                if (_BorderTop){cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(0, 0, this.Size.Width, 3)); }//上 
                                if (_BorderLeft) { cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(0, 0, 3, this.Size.Height)); }//右
                                if (_BorderRigth) { cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(this.Size.Width - 3, 0, 3, this.Size.Height)); }//左
                                if (_BorderBottom) { cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(0, this.Height - 3, this.Size.Width, 3)); }//下
                            } 
                        break;
                    case ButtonStyleShow.Image:
                        if (_DefaultImage != null)
                        {
                            cavan.DrawImage(_DefaultImage, 0, 0, this.Size.Width, this.Size.Height);
                            cavan.DrawString(this.Text, this.Font, new SolidBrush(this.ForeColor), new PointF((this.Size.Width / 2) - (textsize.Width / 2), (this.Size.Height / 2) - (textsize.Height / 2)));
                        }
                        break;
                }
            }
            else if (show == 1)//按下
            {
                switch (_ButtonStyleShow)
                {
                    case ButtonStyleShow.Default:
                        cavan.FillRectangle(new SolidBrush(this.BackColor), new Rectangle(4, 4, this.Size.Width - 6, this.Size.Height - 6));
                        cavan.DrawString(this.Text, this.Font, new SolidBrush(this.ForeColor), new PointF((this.Size.Width / 2) - (textsize.Width / 2), (this.Size.Height / 2) - (textsize.Height / 2)));
                        if (_Border)
                        {
                            if (_BorderTop) { cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(0, 0, this.Size.Width, 4)); }//上
                            if (_BorderLeft) { cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(0, 0, 3, this.Size.Height)); }//右
                            if (_BorderRigth) { cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(this.Size.Width - 3, 0, 3, this.Size.Height)); }//左
                            if (_BorderBottom) { cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(0, this.Height - 3, this.Size.Width, 2)); }//下
                        }
                        break;
                    case ButtonStyleShow.Image:
                        cavan.DrawImage(_DownImage, 0, 0, this.Size.Width, this.Size.Height);
                        cavan.DrawString(this.Text, this.Font, new SolidBrush(this.ForeColor), new PointF((this.Size.Width / 2) - (textsize.Width / 2), (this.Size.Height / 2) - (textsize.Height / 2)));
                        break;
                }

            }
            else if (show == 2)//移上
            {
                switch (_ButtonStyleShow)
                {
                    case ButtonStyleShow.Default:
                            cavan.FillRectangle(new SolidBrush(this.BackColor), new Rectangle(3, 3, this.Size.Width - 6, this.Size.Height - 6));
                            cavan.DrawString(this.Text, this.Font, new SolidBrush(this.ForeColor), new PointF((this.Size.Width / 2) - (textsize.Width / 2), (this.Size.Height / 2) - (textsize.Height / 2)));
                            if (_Border)
                            {
                                if (_BorderTop){cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(0, 0, this.Size.Width, 3)); }//上 
                                if (_BorderLeft) { cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(0, 0, 3, this.Size.Height)); }//右
                                if (_BorderRigth) { cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(this.Size.Width - 3, 0, 3, this.Size.Height)); }//左
                                if (_BorderBottom) { cavan.FillRectangle(new SolidBrush(this._BorderColor), new Rectangle(0, this.Height - 3, this.Size.Width, 3)); }//下
                            } 
                                break;
                    case ButtonStyleShow.Image:
                        cavan.DrawImage(_HoverImage, 0, 0, this.Size.Width, this.Size.Height);
                        cavan.DrawString(this.Text, this.Font, new SolidBrush(this.ForeColor), new PointF((this.Size.Width / 2) - (textsize.Width / 2), (this.Size.Height / 2) - (textsize.Height / 2)));
                        break;
                }
            }
                base.OnPaint(e);
        }
        protected override void OnMouseDown(MouseEventArgs e)
        {
            show = 1;
            Invalidate();
            base.OnMouseDown(e);
        }
        protected override void OnMouseUp(MouseEventArgs e)
        {
            show = 0;
            Invalidate();
            base.OnMouseUp(e);
        }
        private Color FontColor1;
        protected override void OnMouseEnter(EventArgs e)
        {
            FontColor1 = this.ForeColor;
            this.ForeColor = Color.FromKnownColor(KnownColor.Highlight);
            show = 2;
            Invalidate();
            base.OnMouseEnter(e);
        }
        protected override void OnMouseLeave(EventArgs e)
        {
            this.ForeColor=FontColor1;
            show = 0;
            Invalidate();
            base.OnMouseLeave(e);
        }
    }
}