如何以编程方式定义 Traits/UI 视图的内容？

Question

我有一个案例，我不知道 HasTraits 子类的所需内容（即 - Traits 的集合） , 直到程序运行时间，因为它取决于解析具有可变内容的某个文件的结果。

如何在调用其 configure_traits() 方法之前以编程方式自定义此 HasTraits 子类的 View？

这是一个简单的测试用例，它说明了问题：

#! /usr/bin/env python

'Test case, showing problem with dynamically constructed view.'

from traits.api   import HasTraits
from traitsui.api import View, Item

class DynamicViewTester(HasTraits):
    'Tries to dynamically construct its View, using default_traits_view().'

    def default_traits_view(self):
        view = View(
            Item(label='Hello, World!'),
            title='Dynamically Assembled View',
        )
        view.add_trait('msg', Item(label='Goodbye, World.'))
        return view

if(__name__ == '__main__'):
    DynamicViewTester().configure_traits()

当我运行这段代码时，我只在生成的 GUI 中看到 "Hello, World!" 消息。我没有看到 "Goodbye, World." 消息。

Answer 1

我找到了解决方案：

#! /usr/bin/env python

'Test case, showing solution to dynamically constructed view problem.'

from traits.api   import HasTraits, String
from traitsui.api import View, Item

class DynamicViewTester(HasTraits):
    'Dynamically construct its View, using default_traits_view().'

    def __init__(self, *args, **traits):
        super(DynamicViewTester, self).__init__(*args, **traits)

        # Here is where I'll parse the input file, constructing 'content' accordingly.
        content = []
        content.append(Item(label='Hello, World!'))
        content.append(Item(label='Goodbye, World.'))

        self._content = content

    def default_traits_view(self):
        view = View(
            title='Dynamically Assembled View',
            height=0.4,
            width=0.4,
        )
        view.set_content(self._content)
        return view

if(__name__ == '__main__'):
    DynamicViewTester().configure_traits()

如何以编程方式定义 Traits/UI 视图的内容？

How do I define the contents of a Traits/UI View programmatically?

enthought

python-2.7

traitsui