让Kivy的TextInput框架看不见，但显示文字

Question

我试图用

opacity: 0 

然而，为了将TextInput控件“看不见”的，就像您，我想了TextInput中的文本显示。如果我使用

opacity: 0 

了TextInput配件和部件中的文本是不可见的，是有办法“隐藏”窗口小部件，同时还显示文本？

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


class ExampleScreen(Screen): 
    pass 


class ExampleManager(ScreenManager): 
    pass 


root_widget = Builder.load_string(''' 
ExampleManager: 
    ExampleScreen: 

<ExampleScreen>: 
    name: 'example_screen' 
    TextInput: 
     id: t_1 
     text: 'Test text in input 1' 
     size_hint: .5, .5 
     pos_hint: {'x': 0, 'y': .5} 
     multiline: True 
     readonly: True 
     opacity: 0 ## If I remove this line both text edits are visible. 
        ##You can test this by putting ## before opacity 

     ## What I'm trying to do, is make the TextInput widget opaque so 
     ##that you can't see the frame and only the text is visible 

    TextInput: 
     id: t_2 
     text: 'Test text in input 2' 
     size_hint: .5, .5 
     pos_hint: {'x': 0, 'y': 0} 
     multiline: True 
     readonly: True 
     opacity: 0 ## If I remove this line both text edits are visible. 
        ##You can test this by putting ## before opacity 

     ## What I'm trying to do, is make the TextInput widget opaque so 
     ##that you can't see the frame and only the text is visible 

''') 

class TestWidgetsApp(App): 
    def build(self): 
     self.title = 'Proj' 
     return root_widget 

TestWidgetsApp().run() 

Answer 1

使用background_color属性和设置阿尔法通道，以0：

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


class ExampleScreen(Screen): 
    pass 


class ExampleManager(ScreenManager): 
    pass 


root_widget = Builder.load_string(''' 
ExampleManager: 
    ExampleScreen: 

<ExampleScreen>: 
    name: 'example_screen' 
    TextInput: 
     id: t_1 
     text: 'Test text in input 1' 
     size_hint: .5, .5 
     pos_hint: {'x': 0, 'y': .5} 
     multiline: True 
     readonly: True 
     foreground_color: (1,0,1,1) 
     background_color: (0,0,0,0) 

    TextInput: 
     id: t_2 
     text: 'Test text in input 2' 
     size_hint: .5, .5 
     pos_hint: {'x': 0, 'y': 0} 
     multiline: True 
     readonly: True 
     foreground_color: (1,1,0,1) 
     background_color: (0,0,0,0) 

''') 

class TestWidgetsApp(App): 
    def build(self): 
     self.title = 'Proj' 
     return root_widget 

TestWidgetsApp().run()