python - 如果没有选择文件，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，我知道当我选择一个或多个文件时，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)

在我触摸/单击/选择一个文件后，执行 on_selection: root.selected(filechooser.path) 以获取所选文件的当前路径，但即使没有选择文件，我也可以做同样的事情。感谢你的帮助

标签： pythonkivyworking-directory

Answer 1

用于filechooser.path在未选择文件时显示当前工作目录。

片段

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

文件选择器 » 路径

小路

path 是一个StringProperty并且默认为当前工作目录作为一个 unicode 字符串。它指定该控制器应该引用的文件系统上的路径。

您可以执行以下操作：

例子

主文件

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()

主文件

#: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