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winform快速开发平台 -> 工作流组件(仿GooFlow)

对于web方向的工作流,一直在用gooflow对于目前我的winform开发平台却没有较好的工作流组件。

针对目前的项目经验告诉我们。一个工作流控件是很必要的。 当然在 winform方面的工作流第三方组件在网上找了很久,也没有发现自己比较心仪的组件。 

对于工作流组件通过web方式来实现具有绝对的优势。我的这套winform平台当然也不能少了工作流组件。 

通过winform来实现自己的工作流组件,目前我想到的指能通过GDI+重绘的方式来实现工作流的方案。

说干就干,如下图这是我通过GDI+绘制的工作流控件:

winform快速开发平台 -> 工作流组件(仿GooFlow)

设计思想:

控件中我们需要一些定义的节点:如开始、结束、自定义节点、画线,和一个内容画布组成

通过抽象出线、点、以及item。进行重绘。

画布进行双缓冲来解决绘制时导致的出线闪屏问题。 

简单介绍:

画布中的网格绘制方法:

var gridPen = new Pen(Color.Silver) {  DashStyle = DashStyle.Custom,  DashPattern = new float[] { 2f, 2f } };  for (int column = 0; column < (int)Math.Ceiling((double)this.Width / (double)gridAverage); column++) {  bufferGraphics.DrawLine(gridPen, new Point(column * gridAverage, 0), new Point(column * gridAverage, this.Height)); }  for (int row = 0; row < (int)Math.Ceiling((double)this.Height / (double)gridAverage); row++) {  bufferGraphics.DrawLine(gridPen, new Point(0, row * gridAverage), new Point(this.Width, row * gridAverage)); } 

绘制节点抽象类型代码:

public enum ItemType {  /// <summary>  /// 开始  /// </summary>  Start,  /// <summary>  /// 工作流  /// </summary>  Custom,   /// <summary>  /// 线  /// </summary>  Line,  /// <summary>  /// 结束  /// </summary>  End  } 

绘制连线

public void DrawLine(Graphics grp, Pen pen) {  if (m_startPoint == null || m_endPoint == null) return;  var startX = m_startPoint.ItemLocate.X + m_startPoint.ItemImage.Width / 2;  var startY = m_startPoint.ItemLocate.Y + m_startPoint.ItemImage.Height / 2;  var endX = m_endPoint.ItemLocate.X + m_endPoint.ItemImage.Width / 2;  var endY = m_endPoint.ItemLocate.Y + m_endPoint.ItemImage.Height / 2;  #region 计算开始点位置  if (m_startPoint.ItemLocate.X < m_endPoint.ItemLocate.X)  {   if (m_startPoint.ItemLocate.Y < m_endPoint.ItemLocate.Y - m_startPoint.ItemLocate.Y)   {    startX = m_startPoint.ItemLocate.X + m_startPoint.ItemImage.Width / 2;    startY = m_startPoint.ItemLocate.Y + m_startPoint.ItemImage.Height;   }   else if (m_startPoint.ItemLocate.Y < m_endPoint.ItemLocate.Y + m_endPoint.ItemImage.Height)   {    startX = m_startPoint.ItemLocate.X + m_startPoint.ItemImage.Width;    startY = m_startPoint.ItemLocate.Y + m_startPoint.ItemImage.Height / 2;   }   else   {    startX = m_startPoint.ItemLocate.X + m_startPoint.ItemImage.Width / 2;    startY = m_startPoint.ItemLocate.Y;   }  }  else  {   if (m_startPoint.ItemLocate.Y < m_endPoint.ItemLocate.Y - m_startPoint.ItemLocate.Y)   {    startX = m_startPoint.ItemLocate.X + m_startPoint.ItemImage.Width / 2;    startY = m_startPoint.ItemLocate.Y + m_startPoint.ItemImage.Height;   }   else if (m_startPoint.ItemLocate.Y < m_endPoint.ItemLocate.Y + m_endPoint.ItemImage.Height)   {    startX = m_startPoint.ItemLocate.X;    startY = m_startPoint.ItemLocate.Y + m_startPoint.ItemImage.Height / 2;   }   else   {    startX = m_startPoint.ItemLocate.X + m_startPoint.ItemImage.Width / 2;    startY = m_startPoint.ItemLocate.Y;   }  }  #endregion  #region 计算结束点位置  if (m_startPoint.ItemLocate.X < m_endPoint.ItemLocate.X)  {   if (m_startPoint.ItemLocate.Y < m_endPoint.ItemLocate.Y - m_startPoint.ItemLocate.Y)   {    endX = m_endPoint.ItemLocate.X + m_endPoint.ItemImage.Width / 2;    endY = m_endPoint.ItemLocate.Y;   }   else if (m_startPoint.ItemLocate.Y < m_endPoint.ItemLocate.Y + m_endPoint.ItemImage.Height)   {    endX = m_endPoint.ItemLocate.X;    endY = m_endPoint.ItemLocate.Y + m_endPoint.ItemImage.Height / 2;   }   else   {    endX = m_endPoint.ItemLocate.X + m_endPoint.ItemImage.Width / 2;    endY = m_endPoint.ItemLocate.Y + m_endPoint.ItemImage.Height;   }  }  else  {   if (m_startPoint.ItemLocate.Y < m_endPoint.ItemLocate.Y - m_startPoint.ItemLocate.Y)   {    endX = m_endPoint.ItemLocate.X + m_endPoint.ItemImage.Width / 2;    endY = m_endPoint.ItemLocate.Y;   }   else if (m_startPoint.ItemLocate.Y < m_endPoint.ItemLocate.Y + m_endPoint.ItemImage.Height)   {    endX = m_endPoint.ItemLocate.X + m_endPoint.ItemImage.Width;    endY = m_endPoint.ItemLocate.Y + m_endPoint.ItemImage.Height / 2;   }   else   {    endX = m_endPoint.ItemLocate.X + m_endPoint.ItemImage.Width / 2;    endY = m_endPoint.ItemLocate.Y + m_endPoint.ItemImage.Height;   }  }  #endregion  var startPoint = new Point(startX, startY);  var endPoint = new Point(endX, endY);  grp.DrawLine(pen, startPoint, endPoint); } 

通过一点一滴的付出,每个时间点都会看到他的完善。同时也期待着的他的成长。

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