问题
I'm quite new to Kivy (started yesterday) and am trying to create a simple enough app that has input boxes for several values of height and area to calculate volumes. I cant find any working methods of doing this. So far all I have got is this:
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
Builder.load_string("""
<MenuScreen>:
FloatLayout:
Label:
text: 'Please Select an Area to Work With:'
pos: 230, 490
size_hint: .15, .05
font_size: 23
Button:
text: "A"
pos: 230, 100
size_hint: .4,.1
font_size: 23
on_press: root.manager.current = 'settings'
Button:
text: "B"
pos: 230, 210
size_hint: .4,.1
font_size: 23
on_press: root.manager.current = 'settings'
Button:
text: "C"
pos: 230, 320
size_hint: .4,.1
font_size: 23
on_press: root.manager.current = 'settings'
Button:
text: "D"
pos: 230, 420
size_hint: .4,.1
font_size: 23
on_press: root.manager.current = 'settings'
<SettingsScreen>:
GridLayout:
Label:
text: 'Room 1'
pos: 6, 460
size_hint: .15, .05
font_size: 23
Label:
text: 'Room 2'
pos: 6, 420
size_hint: .15, .05
font_size: 23
Label:
text: 'Room 3'
pos: 6, 380
size_hint: .15, .05
font_size: 23
Label:
text: 'Room 4'
pos: 6, 340
size_hint: .15, .05
font_size: 23
Label:
text: 'Room 5'
pos: 6, 300
size_hint: .15, .05
font_size: 23
Label:
text: 'Room 6'
pos: 6, 260
size_hint: .15, .05
font_size: 23
TextInput:
text1: "0"
multiline: False
pos: 200,420
font_size: 23
on_text: viewer.text = self.text1
size_hint: .001, .001
TextInput:
text2: "0"
multiline: False
pos: 200, 420
font_size: 23
on_text: viewer.text = self.text2
size_hint: .001, .001
TextInput:
text3: "0"
multiline: False
pos: 200,380
font_size: 23
on_text: viewer.text = self.text3
size_hint: .001, .001
TextInput:
text4: "0"
multiline: False
pos: 200,340
font_size: 23
on_text: viewer.text = self.text4
size_hint: .001, .001
TextInput:
text5: "0"
multiline: False
pos: 200,300
font_size: 23
on_text: viewer.text = self.text5
size_hint: .001, .001
TextInput:
text6: "0"
multiline: False
pos: 200,240
font_size: 23
on_text: viewer.text = self.text6
size_hint: .001, .001
""")
# Declare both screen
class MenuScreen(Screen):
pass
class SettingsScreen(Screen):
pass
# Create the screen manager
sm = ScreenManager()
sm.add_widget(MenuScreen(name='menu'))
sm.add_widget(SettingsScreen(name='settings'))
class TestApp(App):
def build(self):
return sm
if __name__ == '__main__':
TestApp().run()
Im planning to have the second page unique for each button pressed, but want Any help would be appreciated.
回答1:
I hope I got to understand your question. You are asking for methods to do this. The plain answer is that you have the whole Python to do all the operations you want. Kivy is a library that provides a lot of components to design GUI. It also provides you with a language that is parsed by the Builder.load_string(). Here is an example that might be more or less what you are looking for. It is sort of a calculator on the first screen. The second screen is empty and you can move between them with the bottom buttons.
The calculator on the first screen has two InputTexts and two buttons (Sum and Product). The Sum Button has the implementation of a sum directly on the kivy language. The Product Button calls a method in the root (an instance of Calc). The method doesn't exist by itself. I created in the python code below the kivy section. There is some comments on the code for what I am saying.
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.floatlayout import FloatLayout
Builder.load_string("""
<Calc>:
# This are attributes of the class Calc now
a: _a
b: _b
result: _result
AnchorLayout:
anchor_x: 'center'
anchor_y: 'top'
ScreenManager:
size_hint: 1, .9
id: _screen_manager
Screen:
name: 'screen1'
GridLayout:
cols:1
TextInput:
id: _a
text: '3'
TextInput:
id: _b
text: '5'
Label:
id: _result
Button:
text: 'sum'
# You can do the opertion directly
on_press: _result.text = str(int(_a.text) + int(_b.text))
Button:
text: 'product'
# Or you can call a method from the root class (instance of calc)
on_press: root.product(*args)
Screen:
name: 'screen2'
Label:
text: 'The second screen'
AnchorLayout:
anchor_x: 'center'
anchor_y: 'bottom'
BoxLayout:
orientation: 'horizontal'
size_hint: 1, .1
Button:
text: 'Go to Screen 1'
on_press: _screen_manager.current = 'screen1'
Button:
text: 'Go to Screen 2'
on_press: _screen_manager.current = 'screen2'""")
class Calc(FloatLayout):
# define the multiplication of a function
def product(self, instance):
# self.result, self.a and self.b where defined explicitely in the kv
self.result.text = str(int(self.a.text) * int(self.b.text))
class TestApp(App):
def build(self):
return Calc()
if __name__ == '__main__':
TestApp().run()
来源：https://stackoverflow.com/questions/17428320/kivy-input-values-for-simple-calculations