C#中Winform 实现Ajax效果自定义按钮

更新时间：2020年6月25日 11:17 点击：2189

技术看点

WinForm自定义控件的使用
自定义控件gif动画的播放

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。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;
    }
   }
  }
 }

人机操作界面例子

3)、控件播放gif动画

private void BeginAnimate()
  {
   if (m_AnimateImage == null)
    return;
   if (ImageAnimator.CanAnimate(m_AnimateImage))
   {
    //当gif动画每隔一定时间后，都会变换一帧，那么就会触发一事件， 
    //该方法就是将当前image每变换一帧时，都会调用当前这个委托所关联的方法。 
    ImageAnimator.Animate(m_AnimateImage, m_evthdlAnimator);
   }
  }
  private void StopAnimate()
  {
   if (m_AnimateImage == null)
    return;
   try
   {
    if (ImageAnimator.CanAnimate(m_AnimateImage))
    {
     ImageAnimator.StopAnimate(m_AnimateImage, m_evthdlAnimator);
    }
   }
   finally
   {
    m_IsExecuted = false;
   }
  }
  private void UpdateImage()
  {
   if (m_AnimateImage == null)
    return;
   if (ImageAnimator.CanAnimate(m_AnimateImage))
   {
    //获得当前gif动画的下一步需要渲染的帧，当下一步任何对当前gif动画的操作都是对该帧进行操作) 
    ImageAnimator.UpdateFrames(m_AnimateImage);
   }
  }
  private void OnImageAnimate(Object sender, EventArgs e)
  {
   Invalidate();
  }
  protected override void OnLoad(EventArgs e)
  {
   base.OnLoad(e);
   string s1 = @"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";
   byte[] buffer = Convert.FromBase64String(s1);
   MemoryStream ms = new MemoryStream(buffer);
   var srcImg = Image.FromStream(ms);
   m_AnimateImage = srcImg;
  }

OnLoad执行的操作是从base64字符串里反序列化图片，就是效果图中的Loading的gif图片。这里遇到一个问题：在关闭了MemoryStream之后，会出现“gdi+ 中发生一般性错误”，于是改为不关闭了，控件销毁之后占用的内存就会释放吧。这是一点隐忧，如果有好的办法，希望留言告知。

透明按钮自定义控件全部代码

第一版自定义按钮：

/// <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;
  } 
 }

第二版自定义按钮：

/// <summary>
 /// 自定义透明自定义按钮，模仿实现了网页元素的Ajax效果
 /// </summary>
 public partial class AjaxTransparentButton : 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();
   }
  }
  private Image m_AnimateImage = null;
  private EventHandler m_evthdlAnimator = null;
  private bool m_IsExecuted = false;
  public AjaxTransparentButton()
  {
   BackColor = Color.Transparent;
   SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw | ControlStyles.UserPaint, true);
   SetStyle(ControlStyles.Opaque, false);
   UpdateStyles();
   m_evthdlAnimator = new EventHandler(OnImageAnimate);
  }
  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);
     }
    }
    if (m_AnimateImage != null)
    {
     Rectangle rectGif = new Rectangle((Width - 24) / 2, (Height - 16) / 2 - 8, 32, 32);
     if (m_IsExecuted)
     {
      UpdateImage();
      e.Graphics.DrawImage(m_AnimateImage, rectGif);
     }
     else
     {
      e.Graphics.FillRectangle(new SolidBrush(Color.Transparent), rectGif);
     }
    }
    #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;
  }
  private void BeginAnimate()
  {
   if (m_AnimateImage == null)
    return;
   if (ImageAnimator.CanAnimate(m_AnimateImage))
   {
    //当gif动画每隔一定时间后，都会变换一帧，那么就会触发一事件， 
    //该方法就是将当前image每变换一帧时，都会调用当前这个委托所关联的方法。 
    ImageAnimator.Animate(m_AnimateImage, m_evthdlAnimator);
   }
  }
  private void StopAnimate()
  {
   if (m_AnimateImage == null)
    return;
   try
   {
    if (ImageAnimator.CanAnimate(m_AnimateImage))
    {
     ImageAnimator.StopAnimate(m_AnimateImage, m_evthdlAnimator);
    }
   }
   finally
   {
    m_IsExecuted = false;
   }
  }
  private void UpdateImage()
  {
   if (m_AnimateImage == null)
    return;
   if (ImageAnimator.CanAnimate(m_AnimateImage))
   {
    //获得当前gif动画的下一步需要渲染的帧，当下一步任何对当前gif动画的操作都是对该帧进行操作) 
    ImageAnimator.UpdateFrames(m_AnimateImage);
   }
  }
  private void OnImageAnimate(Object sender, EventArgs e)
  {
   Invalidate();
  }
  protected override void OnLoad(EventArgs e)
  {
   base.OnLoad(e);
   string s1 = @"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";
   byte[] buffer = Convert.FromBase64String(s1);
   MemoryStream ms = new MemoryStream(buffer);
   var srcImg = Image.FromStream(ms);
   m_AnimateImage = srcImg;
  }
  protected override void OnClick(EventArgs e)
  {
   if (m_IsExecuted)
    return;
   Action clickTask = () =>
   {
    m_IsExecuted = true;
    BeginAnimate();
    base.OnClick(e);
    Invalidate();
   };
   //异步执行单击事件
   clickTask.BeginInvoke((result) =>
   {
    clickTask.EndInvoke(result);
    m_IsExecuted = false;
    StopAnimate();
   }, null);
  }
  protected override void Dispose(bool disposing)
  {
   base.Dispose(disposing);
   if (m_AnimateImage != null)
   {
    try
    {
     StopAnimate();
    }
    finally
    {
     m_AnimateImage.Dispose();
     m_evthdlAnimator = null;
    }
   }
  }
  protected override void OnKeyDown(KeyEventArgs e)
  {
   base.OnKeyDown(e);
   if (e.KeyCode == Keys.Enter)
   {
    OnClick(e);
   }
  }
 }

注释不是很多，源码如有需要拿走不谢

[!--infotagslink--]

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