Python Kivy:从其他文件访问类中的应用程序方法

我有四个不同的文件，例如，看起来像这样（这不是一个工作代码，但想法应该很清楚）：

main.py

：

from app import MyApp

def main():
    fmapp = MyApp()
    fmapp.run()

if __name__ == '__main__':
    main()

from kivy.app import App
from SelectableLabel import SelectableLabel

class MyApp(App):
    def show_items(self):
        someList = ['1', 'someText']
        self.root.ids.someotherRecID.data = [{'text': str(x)} for x in someList]

from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.properties import BooleanProperty


class SelectableLabel(RecycleDataViewBehavior, Label):
    ''' Add selection support to the Label '''
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''
        self.index = index
        return super(SelectableRecipeLabel, self).refresh_view_attrs(rv, index, data)

    def on_touch_down(self, touch):
        ''' Add selection on touch down '''
        if super(SelectableRecipeLabel, self).on_touch_down(touch):
            return True
        if self.collide_point(*touch.pos) and self.selectable:
            return self.parent.select_with_touch(self.index, touch)

    def apply_selection(self, rv, index, is_selected):
        ''' Respond to the selection of items in the view. '''
        global selection
        self.selected = is_selected
        if is_selected:
            selection = rv.data[index]['text']
            # MyApp().show_items() <-- How to call this to show items

app.py

：

from app import MyApp

def main():
    fmapp = MyApp()
    fmapp.run()

if __name__ == '__main__':
    main()

from kivy.app import App
from SelectableLabel import SelectableLabel

class MyApp(App):
    def show_items(self):
        someList = ['1', 'someText']
        self.root.ids.someotherRecID.data = [{'text': str(x)} for x in someList]

from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.properties import BooleanProperty


class SelectableLabel(RecycleDataViewBehavior, Label):
    ''' Add selection support to the Label '''
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''
        self.index = index
        return super(SelectableRecipeLabel, self).refresh_view_attrs(rv, index, data)

    def on_touch_down(self, touch):
        ''' Add selection on touch down '''
        if super(SelectableRecipeLabel, self).on_touch_down(touch):
            return True
        if self.collide_point(*touch.pos) and self.selectable:
            return self.parent.select_with_touch(self.index, touch)

    def apply_selection(self, rv, index, is_selected):
        ''' Respond to the selection of items in the view. '''
        global selection
        self.selected = is_selected
        if is_selected:
            selection = rv.data[index]['text']
            # MyApp().show_items() <-- How to call this to show items

SelectableLabel.py

：

from app import MyApp

def main():
    fmapp = MyApp()
    fmapp.run()

if __name__ == '__main__':
    main()

from kivy.app import App
from SelectableLabel import SelectableLabel

class MyApp(App):
    def show_items(self):
        someList = ['1', 'someText']
        self.root.ids.someotherRecID.data = [{'text': str(x)} for x in someList]

from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.properties import BooleanProperty


class SelectableLabel(RecycleDataViewBehavior, Label):
    ''' Add selection support to the Label '''
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''
        self.index = index
        return super(SelectableRecipeLabel, self).refresh_view_attrs(rv, index, data)

    def on_touch_down(self, touch):
        ''' Add selection on touch down '''
        if super(SelectableRecipeLabel, self).on_touch_down(touch):
            return True
        if self.collide_point(*touch.pos) and self.selectable:
            return self.parent.select_with_touch(self.index, touch)

    def apply_selection(self, rv, index, is_selected):
        ''' Respond to the selection of items in the view. '''
        global selection
        self.selected = is_selected
        if is_selected:
            selection = rv.data[index]['text']
            # MyApp().show_items() <-- How to call this to show items

基本上有一个RecycleView（

id:someotherRecID

）列表，当在另一个RecycleView（

id:recID

）中选择一个项目时，我希望更新该列表。当SelectableLabel类和MyApp类通过全局变量在一个文件中时，我可以很容易地做到这一点，但如何在单独的文件中做到这一点？有没有一个很好的方法来处理我想要完成的事情？提前谢谢

例如，这里的示例适用于我，但我想将其拆分：

allinoneapp.py：

from kivy.app import App
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.properties import BooleanProperty


class SelectableLabel(RecycleDataViewBehavior, Label):
    ''' Add selection support to the Label '''
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''
        self.index = index
        return super(SelectableRecipeLabel, self).refresh_view_attrs(rv, index, data)

    def on_touch_down(self, touch):
        ''' Add selection on touch down '''
        if super(SelectableRecipeLabel, self).on_touch_down(touch):
            return True
        if self.collide_point(*touch.pos) and self.selectable:
            return self.parent.select_with_touch(self.index, touch)

    def apply_selection(self, rv, index, is_selected):
        ''' Respond to the selection of items in the view. '''
        global selection
        self.selected = is_selected
        if is_selected:
            selection = rv.data[index]['text']
            fmapp.show_items() # <-- accessing method through global app object

class MyApp(App):
    def show_items(self):
        someList = ['1', 'someText']
        self.root.ids.someotherRecID.data = [{'text': str(x)} for x in someList]


if __name__ == '__main__':
    fmapp = MyApp()
    fmapp.run()

从kivy.app导入应用
从kivy.uix.recycleview.views导入RecycleDataViewBehavior
从kivy.uix.label导入标签
从kivy.properties导入布尔属性
类SelectableLabel（RecycleDataViewBehavior，Label）：
''将选择支持添加到标签''
索引=无
selected=布尔属性（False）
可选=布尔属性（真）
def刷新\视图\属性（自身、rv、索引、数据）：
''捕获并处理视图更改''
self.index=索引
返回超级（SelectableRecipeLabel，self）。刷新\u视图\u属性（rv，索引，数据）
def on_触控向下（自身，触控）：
''在触地时添加选择''
如果超级（可选择RecipeLabel，self.）。打开触摸屏（触摸屏）：
返回真值
如果自碰撞点（*touch.pos）和自选择：
返回self.parent。使用触摸键选择（self.index，touch）
def应用选项（选择了自身、rv、索引）：
''响应视图中的项目选择''
全局选择
self.selected=是否选中
如果选择了以下选项：
selection=rv.data[索引]['text']
fmapp.show_items（）#