我试图在另一个应用程序的布局中使用自定义窗口小部件，但它占用了整个屏幕，而不是在布局中正确缩放。这是.kv文件，分为相关部分（我取出了所有回调，这些回调均按预期运行）：
<NodeWidget>
BoxLayout:
orientation: 'horizontal'
size:root.size
ToggleButton:
size_hint: 0.10345, 1
group: 'Ends'
background_normal: 'Left_Up.png'
background_down: 'Left_Down.png'
Button:
size_hint: 0.801724, 1
background_normal: 'Center_Button_Up.png'
background_down: 'Center_Button_Down.png'
ToggleButton:
size_hint: 0.094827, 1
group: 'Ends'
background_normal: 'Right_Up.png'
background_down: 'Right_Down.png'
下面是单独的应用程序的.kv文件，该文件从上面导入类并使用它：
<NodeEditorWidget>:
GridLayout:
size: root.size
cols: 3
Label:
text: 'Test 1'
NodeWidget:
...
Label:
text: 'Test 3'
这是我现在运行测试应用程序时看到的内容：
在此先感谢您的帮助！
最佳答案
因此，我通过将其移回直接的python（没有.kv文件）解决了这一问题。这是代码：
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.properties import ListProperty, StringProperty, BooleanProperty, ObjectProperty, NumericProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.togglebutton import ToggleButton
#This widget contains two buttons
#The buttons each expose two events
#Names still aren't functioning
class NodeWidget(BoxLayout):
#We expose events:
#on_press when the central button is pressed
#on_release when the central button is released
#on_press_right when the right button is pressed
#on_press_left when the left button is pressed
press = BooleanProperty(False)
release = BooleanProperty(False)
press_right = BooleanProperty(False)
press_left = BooleanProperty(False)
release_right = BooleanProperty(False)
release_left = BooleanProperty(False)
#Properties exposed to set internal properties
title = StringProperty('')
left_background_normal = StringProperty('Left_Up.png')
left_background_down = StringProperty('Left_Down.png')
center_background_normal = StringProperty('Center_Button_Up.png')
center_background_down = StringProperty('Center_Button_Down.png')
right_background_normal = StringProperty('Right_Up.png')
right_background_down = StringProperty('Right_Down.png')
font_name = StringProperty('Roboto')
markup = BooleanProperty(True)
padding_x = NumericProperty(0)
padding_y = NumericProperty(0)
#Which node is active
active_left = BooleanProperty(False)
active_right = BooleanProperty(False)
#Object Properties for internal elements
left_button = ObjectProperty(None)
center_button = ObjectProperty(None)
right_button = ObjectProperty(None)
def __init__(self, **kwargs):
super(NodeWidget, self).__init__(**kwargs)
center = Button()
left = ToggleButton()
right = ToggleButton()
left.size_hint = (0.10345, 1)
center.size_hint = (0.801724, 1)
right.size_hint = (0.094827, 1)
left.background_normal = 'Left_Up.png'
left.background_down = 'Left_Down.png'
center.background_normal = 'Center_Button_Up.png'
center.background_down = 'Center_Button_Down.png'
right.background_normal = 'Right_Up.png'
right.background_down = 'Right_Down.png'
left.group = 'ends'
right.group = 'ends'
left.bind(on_press=self.ActivateNode_Left)
left.bind(on_release=self.ReleaseNode_Left)
right.bind(on_press=self.ActivateNode_Right)
right.bind(on_release=self.ReleaseNode_Right)
center.bind(on_press=self.PressNode)
center.bind(on_release=self.ReleaseNode)
self.left_button = left
self.center_button = center
self.right_button = right
self.bind(title=self.SetTitle)
self.bind(left_background_normal=self.SetLeftBackgroundNormal)
self.bind(left_background_down=self.SetLeftBackgroundDown)
self.bind(center_background_normal=self.SetCenterBackgroundNormal)
self.bind(center_background_down=self.SetCenterBackgroundDown)
self.bind(right_background_normal=self.SetRightBackgroundNormal)
self.bind(right_background_down=self.SetRightBackgroundDown)
self.bind(font_name=self.SetFontName)
self.bind(markup=self.SetMarkup)
self.bind(padding_x=self.SetPaddingX)
self.bind(padding_y=self.SetPaddingY)
self.add_widget(left)
self.add_widget(center)
self.add_widget(right)
def ActivateNode_Left(self, *args):
if self.active_left == False:
self.active_left = True
self.active_right = False
else:
self.active_left = False
self.active_right = True
if self.press_left == True:
self.press_left = False
else:
self.press_left = True
def ActivateNode_Right(self, *args):
if self.active_right == False:
self.active_right = True
self.active_left = False
else:
self.active_right = False
self.active_left = True
if self.press_right == True:
self.press_right = False
else:
self.press_right = True
def ReleaseNode_Left(self, *args):
if self.release_left == True:
self.release_left == False
else:
self.release_left == True
def ReleaseNode_Right(self, *args):
if self.release_right == True:
self.release_right == False
else:
self.release_right == True
def PressNode(self, *args):
if self.press == True:
self.press = False
else:
self.press = True
def ReleaseNode(self, *args):
if self.release == True:
self.release = False
else:
self.release = True
def SetTitle(self, *args):
self.center_button.text = self.title
def SetLeftBackgroundDown(self, *args):
self.left_button.background_down = self.left_background_down
def SetLeftBackgroundNormal(self, *args):
self.left_button.background_normal = self.left_background_normal
def SetCenterBackgroundDown(self, *args):
self.center_button.background_down = self.center_background_down
def SetCenterBackgroundNormal(self, *args):
self.center_button.background_normal = self.center_background_normal
def SetRightBackgroundDown(self, *args):
self.right_button.background_down = self.right_background_down
def SetRightBackgroundNormal(self, *args):
self.right_button.background_normal = self.right_background_normal
def SetFontName(self, *args):
self.center_button.font_name = self.font_name
def SetMarkup(self, *args):
self.center_button.markup = self.markup
def SetPaddingX(self, *args):
self.center_button.padding_x = self.padding_x
def SetPaddingY(self, *args):
self.center_button.padding_y = self.padding_y