如果未选择文件，如何知道FileChooserListView结构下的工作目录

Question

我是python kivy的新手，最近我正在使用kivy来构建我的android应用， 问题如下：

我正在使用FileChooserListView来显示BoxLayout中的所有文件系统，我知道当我选择一个或多个文件时，可以使用some_filechooser.path获取当前的工作目录。

test.kivy

BoxLayout:
    size: root.size
    pos: root.pos
    orientation: "vertical"
    FileChooserListView:
        id: filechooser
        path: "./"
        on_selection: root.selected(filechooser.path)

我再触摸/点击/选择一个文件， on_selection：执行root.selected（filechooser.path）以获得所选文件的当前路径，但是即使没有选择文件，我也可以做同样的事情。 谢谢您的帮助

Answer 1

在未选择任何文件的情况下，使用filechooser.path显示当前工作目录。

摘要

        BoxLayout:
            Label:
                text: 'Working Directory:'
            Label:
                text: filechooser.path

FileChooser»路径

  

路径

     

path是StringProperty，默认为当前工作路径   目录为unicode字符串。它指定文件系统上的路径   该控制器应该参考的。

您可以执行以下操作：

示例

main.py

from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import ObjectProperty
from kivy.uix.popup import Popup
from kivy.lang.builder import Builder

import os


class LoadDialog(FloatLayout):
    load = ObjectProperty(None)
    cancel = ObjectProperty(None)


class SaveDialog(FloatLayout):
    save = ObjectProperty(None)
    text_input = ObjectProperty(None)
    cancel = ObjectProperty(None)


class Root(FloatLayout):
    loadfile = ObjectProperty(None)
    savefile = ObjectProperty(None)
    text_input = ObjectProperty(None)

    def dismiss_popup(self):
        self._popup.dismiss()

    def show_load(self):
        content = LoadDialog(load=self.load, cancel=self.dismiss_popup)
        self._popup = Popup(title="Load file", content=content,
                            size_hint=(0.9, 0.9))
        self._popup.open()

    def show_save(self):
        content = SaveDialog(save=self.save, cancel=self.dismiss_popup)
        self._popup = Popup(title="Save file", content=content,
                            size_hint=(0.9, 0.9))
        self._popup.open()

    def load(self, path, filename):
        with open(os.path.join(path, filename[0])) as stream:
            self.text_input.text = stream.read()

        self.dismiss_popup()

    def save(self, path, filename):
        with open(os.path.join(path, filename), 'w') as stream:
            stream.write(self.text_input.text)

        self.dismiss_popup()


class Editor(App):

    def build(self):
        return Builder.load_file('main.kv')


if __name__ == '__main__':
    Editor().run()

main.kv

#:kivy 1.11.0

Root:
    text_input: text_input

    BoxLayout:
        orientation: 'vertical'
        BoxLayout:
            size_hint_y: None
            height: 30
            Button:
                text: 'Load'
                on_release: root.show_load()
            Button:
                text: 'Save'
                on_release: root.show_save()

        BoxLayout:
            TextInput:
                id: text_input
                text: ''

            RstDocument:
                text: text_input.text
                show_errors: True

<LoadDialog>:
    BoxLayout:
        size: root.size
        pos: root.pos
        orientation: "vertical"
        FileChooserListView:
            id: filechooser

        BoxLayout:
            orientation: 'vertical'
            size_hint_y: None
            height: 90

            BoxLayout:
                Label:
                    text: 'Working Directory:'
                Label:
                    text: filechooser.path

            BoxLayout:
                Label:
                    text: 'Filename:'
                Label:
                    text: ''.join(map(str, filechooser.selection))

            BoxLayout:
                Button:
                    text: "Cancel"
                    on_release: root.cancel()

                Button:
                    text: "Load"
                    on_release: root.load(filechooser.path, filechooser.selection)

<SaveDialog>:
    text_input: text_input
    BoxLayout:
        size: root.size
        pos: root.pos
        orientation: "vertical"
        FileChooserListView:
            id: filechooser
            on_selection: text_input.text = self.selection and self.selection[0] or ''

        TextInput:
            id: text_input
            size_hint_y: None
            height: 30
            multiline: False

        BoxLayout:
            size_hint_y: None
            height: 30
            Button:
                text: "Cancel"
                on_release: root.cancel()

            Button:
                text: "Save"
                on_release: root.save(filechooser.path, text_input.text)

输出