如何将按钮动态添加到 .kv 文件的屏幕管理器的特定屏幕？问题是，创建的按钮显示在所有屏幕上。我有一个正在开发的程序，它允许用户在那里输入特定条件并计算 ACFM。我目前正在尝试设置一个允许用户创建多个文件的文件屏幕。我试图允许一个名为“创建新文件”的主按钮在第一个屏幕上创建更多按钮。问题是，创建的按钮显示在所有屏幕上。主文件from kivy.app import Appfrom kivy.lang import Builderfrom kivy.core.window import Windowfrom kivy.uix.floatlayout import FloatLayoutimport Functions as f1from kivy.uix.button import ButtonWindow.size = (300,625)window_x = Window.widthwindow_y = Window.heightBuilder.load_file("main.kv")class counter: def __init__(self): self.count = 2 def increase(self): self.count += 1b = counter()class Calc(FloatLayout): def testbutton(self,instance): btn = Button(text = "testing123", color = (1,1,1,1), size_hint =(.5,.05), pos = (0,(window_y-(window_y*(.07+(b.count*.05))))) ) b.increase() self.add_widget(btn) # define the multiplication of a function def calculate(self, instance): f = float(self.flow.text) p = float(self.pressure.text) t = float(self.temperature.text) sg = float(self.specific_gravity.text) self.acfm.text = str(f) #str(f1.ACFM(f,p,t,sg)) I commented this out for the purpose of posting this in my questions.class test(App): def build(self): return Calc()if __name__=="__main__": test().run()我没有收到任何错误消息。我只希望 .py 文件中动态创建的按钮只能转到 .kv 文件的一个屏幕。
1 回答
千巷猫影
TA贡献1829条经验 获得超7个赞
您当前正在将其添加到作为根的 Calc FloatLayout 中，并且每个屏幕都是该根的子项。如果您只想将其添加到一个屏幕，则需要调用该特定屏幕的 add_widgets 函数。
一种选择是通过 id
像下面这样更改kv文件
Screen:
id: id_solverscreen
name: "solverscreen"
像下面这样更改py文件
self.ids.id_solverscreen.add_widget(btn)
蟒蛇文件
from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.button import Button
Window.size = (300,625)
window_x = Window.width
window_y = Window.height
Builder.load_file("main.kv")
class counter:
def __init__(self):
self.count = 2
def increase(self):
self.count += 1
b = counter()
class Calc(FloatLayout):
def testbutton(self,instance):
btn = Button(text = "testing123", color = (1,1,1,1),
size_hint =(.5,.05),
pos = (0,(window_y-(window_y*(.07+(b.count*.05)))))
)
b.increase()
self.ids.id_solverscreen.add_widget(btn)
# define the multiplication of a function
def calculate(self, instance):
f = float(self.flow.text)
p = float(self.pressure.text)
t = float(self.temperature.text)
sg = float(self.specific_gravity.text)
self.acfm.text = str(f) #str(f1.ACFM(f,p,t,sg)) I commented this out for the purpose of posting this in my questions.
class test(App):
def build(self):
return Calc()
if __name__=="__main__":
test().run()
.kv 文件
<calc>:
flow: _flow
pressure: _pressure
temperature: _temperature
specific_gravity: _specific_gravity
acfm: _acfm
FloatLayout:
ScreenManager:
id: screen_manager
size: self.size
Screen:
name: "filescreen"
FloatLayout:
canvas:
Color:
rgb: 1,1,1
Rectangle:
size: self.width, self.height
pos: self.pos
AnchorLayout:
anchor_x: 'center'
anchor_y: 'top'
Label:
canvas.before:
Color:
rgb: 1,1,1
Rectangle:
size: self.size
pos: self.pos
Color:
rgb: 0,0,0
Line:
width: 1
rectangle: self.x,self.y,self.width,self.height
size_hint: 1,.07
FilescreenButton:
text: "Create New File"
pos: 0,root.height-(root.height*(.07+.05))
on_press: root.testbutton(*args)
Screen:
id: id_solverscreen
name: "solverscreen"
GridLayout:
cols:1
size_hint: 1,1
ScrollView:
FloatLayout:
canvas:
Color:
rgb: 1,1,1
Rectangle:
size: self.width, self.height
pos: self.pos
size_hint: 1,1.5
GridLayout:
cols:1
spacing: 1
pos_hint: {"top": (1),"left": 1}
size_hint: .4, None
row_default_height: root.height*.05
Label:
text: "Inputs"
color: 0,0,0,1
canvas.before:
Color:
rgb: 1,1,1
Rectangle:
size: self.width,self.height
pos: self.pos
CustomLabel:
text: "Flow"
CustomLabel:
text: "Pressure"
CustomLabel:
text: "Temperature"
CustomLabel:
text: "Specific Gravity"
Label:
text: "Results"
color: 0,0,0,1
canvas.before:
Color:
rgb: 1,1,1
Rectangle:
size: self.width,self.height
pos: self.pos
Button:
text: "Calculate"
on_press: root.calculate(*args)
GridLayout:
cols:1
spacing: 1
pos_hint: {"top": (1),"right": .7}
size_hint: .3, None
row_default_height: root.height*.05
Label:
canvas.before:
Color:
rgb: 1,1,1
Rectangle:
size: self.width,self.height
pos: self.pos
TextInput:
text: "0"
id: _flow
TextInput:
text: "0"
id: _pressure
TextInput:
text: "0"
id: _temperature
TextInput:
text: ".6"
id: _specific_gravity
Label:
canvas.before:
Color:
rgb: 1,1,1
Rectangle:
size: self.width,self.height
pos: self.pos
Label:
id: _acfm
color: 0,0,0,1
canvas.before:
Color:
rgba: .7,.7,.7,1
Rectangle:
pos: self.pos
size: self.size
Color:
rgb: 1,1,1
Line:
width: 1
rectangle: self.x,self.y,self.width,self.height
GridLayout:
cols:1
spacing: 1
pos_hint: {"top": (1),"right": 1}
size_hint: .3, None
row_default_height: root.height*.05
Label:
canvas.before:
Color:
rgb: 1,1,1
Rectangle:
size: self.width,self.height/2
pos: self.pos
CustomButton:
text: "MMSCFD"
CustomButton:
text: "PSIG"
CustomButton:
text: "F"
CustomButton:
text: "SG"
Label:
canvas.before:
Color:
rgb: 1,1,1
Rectangle:
size: self.width,self.height
pos: self.pos
CustomButton:
text: "ACFM"
AnchorLayout:
anchor_x: 'left'
anchor_y: 'bottom'
GridLayout:
cols: 4
size_hint: 1,.05
canvas:
Color:
rgb: 1,1,1
Rectangle:
size: self.size
pos: self.pos
Button:
text: "Files"
on_press: screen_manager.current = 'filescreen'
Button:
text: "Solver"
on_press: screen_manager.current = 'solverscreen'
<CustomLabel@Label>:
#font_size: (((self.width*5)+(self.height))/6)*.12
canvas.before:
Color:
rgb: 0,0,0
Rectangle:
size: self.size
pos: self.pos
<CustomButton@Button>:
background_color: .25,.25,.25,1
canvas.before:
Color:
rgba: .25,.25,.25,1
Rectangle:
size: self.size
pos: self.pos
Line:
width: .09
rectangle: self.x,self.y,self.width,self.height
<FilescreenButton@Button>:
size_hint: .5,.05
color: 0,0,0,1
background_color: 1,1,1,0
canvas:
Color:
rgb: 0,0,0
Line:
width: 1
rectangle: self.x,self.y,self.width,self.height
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