kivy戦記(14)　ロールバック分の復元

import os
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.popup import Popup
from kivy.uix.treeview import TreeViewLabel
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty
from pprint import pprint
from kivy.core.text import LabelBase, DEFAULT_FONT
from kivy.resources import resource_add_path
# 日本語フォント設定
resource_add_path('./fonts')
LabelBase.register(DEFAULT_FONT, 'ipaexg.ttf')
sm = ScreenManager()
class SetSCN(Screen):
    def okButtonClicked(self):
        sm.current = 'all'
    def cancelButtonClicked(self):
        sm.current = 'all'

class LoadDialog(FloatLayout):
    load = ObjectProperty(None)
    cancel = ObjectProperty(None)
class AllSCN(Screen):
    tv = ObjectProperty(None)
    file_name = ObjectProperty(None)
    loadfile = ObjectProperty(None)
    text_input = ObjectProperty(None)
    def __init__(self, **kwargs):
        super(AllSCN, self).__init__(**kwargs)
        self.tv.add_node(TreeViewLabel(text ='シンカリオン E1 とき'))
        self.tv.add_node(TreeViewLabel(text ='シンカリオン 0 ひかり'))
        self.tv.add_node(TreeViewLabel(text ='シンカリオン キハ32　鉄道ホビートレイン'))
    def setupButtonClicked(self):
        sm.current = 'set'
    def show_load(self):
        content = LoadDialog(load = self.load, cancel = self.dismiss_popup)
        self._popup = Popup( title="読み込み中", content=content, size_hint=(0.9,0.9))
        self._popup.open()
    def load (self, path, filename):
        pprint(filename)
        self.file_name.text = filename[0]
        #with open (os.path.join(path, filename[0])) as stream:
        #    self.text_input.text = stream.read()
        self.dismiss_popup()
    def dismiss_popup(self):
        self._popup.dismiss()
class FilelistApp(App):
    def build(self):
        sm.add_widget(AllSCN(name='all'))
        sm.add_widget(SetSCN(name='set'))
        return sm
if __name__ == '__main__':
    FilelistApp().run()

<SetSCN>:
    BoxLayout:
        orientation: 'vertical'
        BoxLayout:
            size_hint_y: 0.9
            Label:
                text: 'おほほ'
        BoxLayout:
            size_hint_y: 0.1
            Button:
                size_hint_x: 0.5
                text: 'OK'
                on_release: root.okButtonClicked()
            Button:
                size_hint_x: 0.5
                text: 'キャンセル'
                on_release: root.cancelButtonClicked()

<AllSCN>:
    tv: tv
    file_name: file_name
    BoxLayout:
        orientation: 'vertical'
        BoxLayout: #OpnSCN
            size_hint_y: 0.1
            orientation: 'horizontal'
            BoxLayout:
                Button:
                    size_hint_x: 0.1
                    text: '設定'
                    on_release: root.setupButtonClicked()
                TextInput:
                    id: file_name
                    size_hint_x: 0.7
                    text: 'ファイルパス'
                Button:
                    size_hint_x: 0.1
                    text: '…'
                    on_release: root.show_load()
                Button:
                    size_hint_x: 0.1
                    text: '実行'
        BoxLayout: #ResultSCN
            size_hint_y: 0.9
            TreeView:
                id: tv
<LoadDialog>:
    BoxLayout:
        size: root.size
        pos: root.pos
        orientation: 'vertical'
        FileChooserListView:
            id: filechooser
        BoxLayout:
            size_hint_y : None
            height : 30
            Button:
                text: 'キャンセル'
                on_release: root.cancel()
            Button:
                text: '読み込み'
                on_release: root.load(filechooser.path, filechooser.selection)
AllSCN: