使用 npyscreen 在表单之间传递值

Question

我正在尝试npyscreen在 python 中创建一个简单的curses应用程序，该应用程序请求用户在一个屏幕上输入，然后在另一个屏幕上为用户验证它。

大多数情况下，这是为了理解如何在 内部存储和检索值npyscreen。我确信我错过了一些简单的东西，但我无法在文档中找到（或理解？）答案。

下面的示例代码将无法正确传递值：

#!/usr/bin/env python3.5

import npyscreen as np

class EmployeeForm(np.Form):
    def afterEditing(self):
        self.parentApp.switchForm('CONFIRMFM')

    def create(self):
        self.myName = self.add(np.TitleText, name='Name')
        self.myDepartment = self.add(np.TitleSelectOne, scroll_exit=True, max_height=3, name='Department', values = ['Department 1', 'Department 2', 'Department 3'])
        self.myDate = self.add(np.TitleDateCombo, name='Date Employed')

class EmployeeConfirmForm(np.Form):
    def afterEditing(self):
        self.parentApp.setNextForm(None)

    def create(self):
        self.value = None
        self.wgName   = self.add(np.TitleText, name = "Name:",)
        self.wgDept = self.add(np.TitleText, name = "Dept:")
        self.wgEmp      = self.add(np.TitleText, name = "Employed:")

    def beforeEditing(self):
        if self.value:
            self.name = "Is this correct?"
            self.wgName.value   = self.myName.value
            self.wgDept.value = self.myDepartment.value
            self.wgEmp.value      = self.myDate.value

    def on_cancel(self):
        self.parentApp.switchFormPrevious()


class myApp(np.NPSAppManaged):
    def onStart(self):
        self.addForm('MAIN', EmployeeForm, name='Employee Entry')
        self.addForm('CONFIRMFM', EmployeeConfirmForm, name='Employee Confirmation')

if __name__ == '__main__':
    TestApp = myApp().run()

Answer 1

我还没有找到一种直接在表单之间传递变量的简单方法。但是，您可以通过使用在表单中具有全局作用域的变量来解决此问题。

应用NPSAppManaged程序类完全封装运行，因此如果您尝试在 Python 文件顶部声明全局变量，其中的表单将无法访问它们。NPSAppManaged相反，请在方法之前声明应用程序类内的变量onStart，如下所示。

class myApp(np.NPSAppManaged):

    # declare variables here that have global scope to all your forms
    myName, myDepartment, myDate = None, None, None

    def onStart(self):
        self.addForm('MAIN', EmployeeForm, name='Employee Entry')
        self.addForm('CONFIRMFM', EmployeeConfirmForm, name='Employee Confirmation')

if __name__ == '__main__':
    TestApp = myApp().run()

self.parentApp.[variable name]然后，您可以使用以下方式访问这些变量：

class EmployeeConfirmForm(np.Form):
    def afterEditing(self):
        self.parentApp.setNextForm(None)

    def create(self):
        self.add(np.FixedText, value = "Is this correct?")
        self.wgName = self.add(np.TitleText, name = "Name:", value = self.parentApp.myName)
        self.wgDept = self.add(np.TitleText, name = "Dept:", value = self.parentApp.myDepartment)
        self.wgEmp = self.add(np.TitleText, name = "Employed:", value = self.parentApp.myDate)

    def on_cancel(self):
        self.parentApp.switchFormPrevious()

注意：您不需要有单独的方法，因为在该方法期间将直接从应用程序类全局变量beforeEditing加载值。EmployeeConfirmFormcreate