如果没有选择文件，我如何知道 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 构建我的 android 应用程序，问题如下：

我正在使用 FileChooserListView 在我的 boxlayout 中显示所有文件系统，我知道当我 select 一个或多个文件时，我可以使用 some_filechooser.path 来获取当前工作目录.

test.kivy

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

在我 touch/click/select 一个文件之后， on_selection: root.selected(filechooser.path) 被执行以获取selected 文件的当前路径，但是即使没有文件我也能做同样的事情吗select编辑。感谢您的帮助

Answer 1

当没有选择文件时，使用filechooser.path显示当前工作目录。

片段

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

文件选择器 » 路径

path

path is a StringProperty and defaults to the current working directory as a unicode string. It specifies the path on the filesystem that this controller should refer to.

您可以执行以下操作：

例子

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)

如果没有选择文件，我如何知道 FileChooserListView 结构下的工作目录

How can I know the working directory under FileChooserListView structure if no file is selected

python

working-directory

kivy

test.kivy

片段

文件选择器 » 路径

例子

main.py

main.kv

输出