Question

我希望在按下输入TextInput小部件时它应该做两件事 -

更改屏幕（我正在使用屏幕管理器）
并搜索关键字

我知道使用on_text_validate，我们可以通过 -

1 .root.manager.current='namesomething'

2。root.function_which_has_search_algorithm()

无论如何我可以使用on_text_validate来做两件事（changing_the_screen，calling_the_search_function）或者我是否必须使用其他技术？

这里有一个示例代码：

import kivy
kivy.require("1.10.0")

from kivy.app import App 
from kivy.uix.screenmanager import ScreenManager,Screen 
from kivy.lang import Builder

Builder.load_file('screenswitch.kv')

class MainScreen(Screen):
    def SelectWord(self):
        ''' some search
                   code'''

class OtherScreen(Screen):
    pass

sm = ScreenManager()
sm.add_widget(MainScreen(name='main'))
sm.add_widget(OtherScreen(name='other'))

class ScreenSwitchApp(App):
    def build(self):
        return sm

obj = ScreenSwitchApp()
obj.run()

继承我的kivy代码：

<MainScreen>:
    BoxLayout:
        TextInput:
            text: "Search your word here"
            color: 1,1,1,1
            id: search_input
            width: 200
            size_hint: None, .20
            pos_hint: {"center_x": .5, "center_y": 0.5}
            multiline: False
            on_text_validate: root.SelectWord() # i want this to change screen also


<OtherScreen>:
    BoxLayout:
        Button:
            text: 'back to main screen'
            on_press: root.manager.current='main'

Answer 1

一种可能的解决方案是创建一个调用这两个函数的新函数：

<强> *。PY

import kivy
kivy.require("1.10.0")

from kivy.app import App 
from kivy.uix.screenmanager import ScreenManager,Screen 
from kivy.lang import Builder

Builder.load_file('screenswitch.kv')

class MainScreen(Screen):
    def some_function(self):
        self.SelectWord()
        self.manager.current='other'

    def SelectWord(self):
        print("SelectWord")

class OtherScreen(Screen):
    pass

sm = ScreenManager()
sm.add_widget(MainScreen(name='main'))
sm.add_widget(OtherScreen(name='other'))

class ScreenSwitchApp(App):
    def build(self):
        return sm

obj = ScreenSwitchApp()
obj.run()

<强> *。KV

<MainScreen>:
    BoxLayout:
        TextInput:
            text: "Search your word here"
            color: 1,1,1,1
            id: search_input
            width: 200
            size_hint: None, .20
            pos_hint: {"center_x": .5, "center_y": 0.5}
            multiline: False
            on_text_validate: root.some_function() # i want this to change screen also


<OtherScreen>:
    BoxLayout:
        Button:
            text: 'back to main screen'
            on_press: root.manager.current='main'

Answer 2

        TextInput:
                id:qty_inp
                size_hint_x:.1
                multiline:False
                on_text_validate:root.update_price()
                on_text_validate:root.update_purchase

像上面的代码一样，您可以再添加一个on_text_validate：root.method（）

如何使用on_text_validate绑定两个或多个事件

2 个答案: