C#Winform 自定义透明按钮和单窗体模块化实现

技术看点

• WinForm自定义控件的使用
• WinForm单窗体应用如何模块化

需求及效果

又来一波 C# GDI自定义控件show 。这个控件已经使用几年了，最近找出来重构一下。原来是没有边框的，那么导致导航的功能不是很突出。本来想加个效果：在执行单击时显示Loading动画，在执行完单击事件后恢复原样。这就是网页里见到的局部刷新，Ajax常用的场景。无奈要下班了，还没弄出来。需求来自几年前一个智能储物柜项目，人机界面有个美工设计好的效果图，为了省事和通用，需要一个透明的按钮来实现导航的任务。就是控件只是设计时可见，运行时不可见。

关键点说明

1）、GraphicsPath实现矩形的圆角羽化处理

 using (GraphicsPath path = new GraphicsPath())
            {
                #region 羽化，圆角处理
                path.StartFigure();
                path.AddArc(new Rectangle(new Point(rect.X, rect.Y), new Size(2 * Radius, 2 * Radius)), 180, 90);
                path.AddLine(new Point(rect.X + Radius, rect.Y), new Point(rect.Right - Radius, rect.Y));
                path.AddArc(new Rectangle(new Point(rect.Right - 2 * Radius, rect.Y), new Size(2 * Radius, 2 * Radius)), 270, 90);
                path.AddLine(new Point(rect.Right, rect.Y + Radius), new Point(rect.Right, rect.Bottom - Radius));
                path.AddArc(new Rectangle(new Point(rect.Right - 2 * Radius, rect.Bottom - 2 * Radius), new Size(2 * Radius, 2 * Radius)), 0, 90);
                path.AddLine(new Point(rect.Right - Radius, rect.Bottom), new Point(rect.X + Radius, rect.Bottom));
                path.AddArc(new Rectangle(new Point(rect.X, rect.Bottom - 2 * Radius), new Size(2 * Radius, 2 * Radius)), 90, 90);
                path.AddLine(new Point(rect.X, rect.Bottom - Radius), new Point(rect.X, rect.Y + Radius));
                path.CloseFigure();
                #endregion 
                

要点就是画几段弧线和矩形连接起来。透明就是用了Color.FromArgb加上透明度，然后填充GraphicsPath形成透明区域。

g.FillPath(new SolidBrush(Color.FromArgb(153, BackColor)), path);

2)、单窗体应用如何模块化 

窗体只有一个，但操作界面好多个，由于是无人值守的应用。那么老是切换窗体操作是非常不方便的。工作区域是一个容器Panel,把每个操作界面定义成一个Panel作为只容器。

 public partial class DepositBizPanel : UserControl
    {
        private BackgroundStyle backgroundStyle = BackgroundStyle.Green;
        /// <summary>
        /// 主题风格
        /// </summary>
        public BackgroundStyle BackgroundStyle
        {
            get { return backgroundStyle; }
            set
            {
                backgroundStyle = value;
                switch (value)
                {
                    case GreenlandExpressBox.BackgroundStyle.Blue:
                        BackgroundImage = Properties.Resources.jbblue;
                        break;
                    case GreenlandExpressBox.BackgroundStyle.Orange:
                        BackgroundImage = Properties.Resources.jborange;
                        break;
                    case GreenlandExpressBox.BackgroundStyle.Green:
                        BackgroundImage = Properties.Resources.jbgreen;
                        break;
                }
                Invalidate();
            }
        }

        public Panel ParentPanel
        {
            get;
            set;
        }

        public Bitmap QR_Barcode
        {
            get { return (Bitmap)pbxBarcode.Image; }
            set { pbxBarcode.Image = value; }
        }

        public DialogResult PanelDiagResult
        {
            get;
            set;
        }

        public DepositBizPanel(Panel parent, Bitmap barcode, BackgroundStyle style)
        {
            InitializeComponent();
            DoubleBuffered = true;
            ParentPanel = parent;
            QR_Barcode = barcode;
            BackgroundStyle = style;
        }       

        private void btnback_Click(object sender, EventArgs e)
        {
            foreach (Control panel in ParentPanel.Controls)
            {
                if (panel is DepositBizPanel)
                {
                    ParentPanel.Controls.Remove(panel);
                    PanelDiagResult = DialogResult.Cancel;
                    break;
                }
            }
        }

        private void btnprocessnext_Click(object sender, EventArgs e)
        {
            foreach (Control panel in ParentPanel.Controls)
            {
                if (panel is DepositBizPanel)
                {
                    ParentPanel.Controls.Remove(panel);
                    PanelDiagResult = DialogResult.OK;
                    break;
                }
            }
        }
    }

透明按钮自定义控件全部代码

自定义按钮：

/// <summary>
    /// Cool透明自定义按钮
    /// </summary>
    public partial class CoolTransparentButton : UserControl
    {
        private Size iconSize = new Size(32, 32);
        public Size IconSize
        {
            get
            {
                return iconSize;
            }
            set
            {
                iconSize = value;
                Invalidate();
            }
        }
        private string _ButtonText;
        public string ButtonText
        {
            get { return _ButtonText; }
            set
            {
                _ButtonText = value;
                Invalidate();
            }
        }
        protected Image _IconImage;
        public Image IconImage
        {
            get
            {
                return _IconImage;
            }
            set
            {
                _IconImage = value;
                Invalidate();
            }
        }
        private bool _FocseActived = false;
        private Color _BorderColor = Color.White;
        public Color BorderColor
        {
            get
            {
                return _BorderColor;
            }
            set
            {
                _BorderColor = value;
                Invalidate();
            }
        }
        private int _Radius = 12;
        public int Radius
        {
            get
            {
                return _Radius;
            }
            set
            {
                _Radius = value;
                Invalidate();
            }
        }
        private bool ifDrawBorderWhenLostFocse = true;
        /// <summary>
        /// 失去焦点是否画边框
        /// </summary>
        public bool IfDrawBorderWhenLostFocse
        {
            get
            {
                return ifDrawBorderWhenLostFocse;
            }
            set
            {
                ifDrawBorderWhenLostFocse = value;
                Invalidate();
            }
        }
        /// <summary>
        /// 是否处于激活状态(焦点)
        /// </summary>
        public bool FocseActived
        {
            get { return _FocseActived; }
            set
            {
                _FocseActived = value;
                Invalidate();
            }
        }          
        public CoolTransparentButton()
        {
            DoubleBuffered = true;
            BackColor = Color.Transparent;
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw, true);
            SetStyle(ControlStyles.Opaque, false);
            UpdateStyles(); 
        }
        protected override void OnPaint(PaintEventArgs e)
        {
            var rect = ClientRectangle;
            rect.Inflate(-1, -1);
            Graphics g = e.Graphics;
            g.SmoothingMode = SmoothingMode.HighQuality;
            using (GraphicsPath path = new GraphicsPath())
            {
                #region 羽化，圆角处理
                path.StartFigure();
                path.AddArc(new Rectangle(new Point(rect.X, rect.Y), new Size(2 * Radius, 2 * Radius)), 180, 90);
                path.AddLine(new Point(rect.X + Radius, rect.Y), new Point(rect.Right - Radius, rect.Y));
                path.AddArc(new Rectangle(new Point(rect.Right - 2 * Radius, rect.Y), new Size(2 * Radius, 2 * Radius)), 270, 90);
                path.AddLine(new Point(rect.Right, rect.Y + Radius), new Point(rect.Right, rect.Bottom - Radius));
                path.AddArc(new Rectangle(new Point(rect.Right - 2 * Radius, rect.Bottom - 2 * Radius), new Size(2 * Radius, 2 * Radius)), 0, 90);
                path.AddLine(new Point(rect.Right - Radius, rect.Bottom), new Point(rect.X + Radius, rect.Bottom));
                path.AddArc(new Rectangle(new Point(rect.X, rect.Bottom - 2 * Radius), new Size(2 * Radius, 2 * Radius)), 90, 90);
                path.AddLine(new Point(rect.X, rect.Bottom - Radius), new Point(rect.X, rect.Y + Radius));
                path.CloseFigure();
                #endregion 
                if (!FocseActived)
                {
                    if (ifDrawBorderWhenLostFocse)
                        g.DrawPath(new Pen(Color.Gray, 1), path);
                    g.FillPath(new SolidBrush(Color.FromArgb(66, BackColor)), path);
                }
                else
                {
                    g.DrawPath(new Pen(BorderColor, 1), path);
                    rect.Inflate(-1, -1);
                    g.FillPath(new SolidBrush(Color.FromArgb(153, BackColor)), path);
                }
                #region 画文本
                g.SmoothingMode = SmoothingMode.AntiAlias;
                if (IconImage != null)
                {
                    Rectangle rc = new Rectangle((Width - 32) / 2, 16, IconSize.Width, IconSize.Height);
                    g.DrawImage(IconImage, rc);
                }
                if (!string.IsNullOrEmpty(ButtonText))
                {
                    using (StringFormat f = new StringFormat())
                    {
                        Rectangle rectTxt = new Rectangle(0, (Height - 18) / 2, Width, 36);
                        f.Alignment = StringAlignment.Center;// 水平居中对齐 
                        f.LineAlignment = StringAlignment.Center;   // 垂直居中对齐 
                        f.FormatFlags = StringFormatFlags.NoWrap;// 设置为单行文本 
                        SolidBrush fb = new SolidBrush(this.ForeColor); // 绘制文本 
                        e.Graphics.DrawString(ButtonText, new Font("微软雅黑", 16F, FontStyle.Bold), fb, rectTxt, f);
                    }
                }
                #endregion 
            }
        }
        protected override void OnMouseHover(EventArgs e)
        {
            FocseActived = true;
        }
        protected override void OnMouseLeave(EventArgs e)
        {
            FocseActived = false;
        }
        protected override void OnEnter(EventArgs e)
        {
            FocseActived = true;
        }
        protected override void OnLeave(EventArgs e)
        {
            FocseActived = false;
        } 
    }

注释不是很多，如有需要拿走不谢.