FreeCAD作为一款基于OpenCasCAD内核的开源CAD软件，可以在GitHub上下载源代码。阅读源代码，有助于我们学习CAD软件架构，了解底层几何算法。

由博主Caesar卢尚宇自学整理(纯粹出于对三维CAD软件开发的热爱)

内容出自FreeCAD官方社区https://wiki.freecadweb.org/Workbench_creation

可以把FreeCAD理解成一个QT界面的容器，每次FreeCAD启动时都去Mod文件夹里读取所有工作台。

我们在Mod里添加自己的工作台文件夹，里面放三个文件。

Init.py这个是FreeCAD启动的时候执行的，不与界面交互的，后台执行。(一般做界面工具开发，这个文件为空就行了)

InitGui.py这个是FreeCAD启动的时候执行的，与界面交互的代码。

LSY.py这个是我们存放命令功能的文件。

InitGui.py

classMyWorkbench ( Workbench ):

MenuText= "My Workbench1"ToolTip= "A description of my workbench"Icon= """paste here the contents of a 16x16 xpm icon"""

defInitialize(self):"""This function is executed when FreeCAD starts"""

import LSY #import here all the needed files that create your FreeCAD commands

self.list = [‘MySecondCommand‘, ‘MySecondCommand1‘] #A list of command names created in the line above

self.appendToolbar(‘My Commands‘,self.list) #creates a new toolbar with your commands

self.appendMenu(‘My New Menu‘,self.list) #creates a new menu

self.appendMenu(["An existing Menu", "My submenu"], self.list) #appends a submenu to an existing menu

defActivated(self):"""This function is executed when the workbench is activated"""

return

defDeactivated(self):"""This function is executed when the workbench is deactivated"""

return

defContextMenu(self, recipient):"""This is executed whenever the user right-clicks on screen"""

#"recipient" will be either "view" or "tree"

self.appendContextMenu("My commands", self.list) #add commands to the context menu

defGetClassName(self):#this function is mandatory if this is a full python workbench

return "Gui::PythonWorkbench"Gui.addWorkbench(MyWorkbench())

Caesar卢尚宇

2020年3月24日

LSY.py

importFreeCADimportFreeCADGuifrom PySide importQtGui, QtCoreclassMySecondCommand:defGetResources(self):return {‘Pixmap‘: ‘freecad‘, ‘MenuText‘: ‘show Message1‘, ‘ToolTip‘: ‘Print show Message1‘}def Activated(self): #点击按钮执行的动作

"""Do something here"""reply= QtGui.QMessageBox.information(None,"","Houston, we have a problem")return

defIsActive(self):"""Here you can define if the command must be active or not (greyed) if certain conditions

are met or not. This function is optional."""

returnTrue

FreeCADGui.addCommand(‘MySecondCommand‘, MySecondCommand())classMySecondCommand1:defGetResources(self):return {‘Pixmap‘: ‘freecad‘, ‘MenuText‘: ‘show Message2‘, ‘ToolTip‘: ‘Print show Message2‘}def Activated(self): #点击按钮执行的动作

"""Do something here"""reply= QtGui.QMessageBox.question(None, "", "This is your chance to answer, what do you think?",QtGui.QMessageBox.Yes |QtGui.QMessageBox.No, QtGui.QMessageBox.No)if reply ==QtGui.QMessageBox.Yes:#this is where the code relevant to a ‘Yes‘ answer goes

pass

if reply ==QtGui.QMessageBox.No:#this is where the code relevant to a ‘No‘ answer goes

pass

return

defIsActive(self):"""Here you can define if the command must be active or not (greyed) if certain conditions

are met or not. This function is optional."""

returnTrue

FreeCADGui.addCommand(‘MySecondCommand1‘, MySecondCommand1())

Caesar卢尚宇

2020年3月24日

这两个文件里的代码，也是从社区里找到的。但是！原封不动的复制下来去做，会出错。一定要修改它的代码。我试了两个小时，在找到一些有问题的地方。(使用的话，直接复制我上面的代码就行了，我修改过了)

第一处：

第二处：

第三处：

演示：

附加参考资料https://www.jianshu.com/p/8a0a2b0e4aea

Caesar卢尚宇

2020年3月24日

原文：https://www.cnblogs.com/nxopen2018/p/12563018.html