我對 Kivy-Libaray 有疑問。我目前正在為 ShoppinglistApp 撰寫前端。我有一個主選單，您可以在其中選擇您想要做的事情（添加串列/商店），您可以從那里進入商店選擇。
- 在商店選擇選單中有 4 家商店。
- 所有專案（產品）都存盤在一個串列中。
- 如果您選擇商店，則應為每個商品（來自此商店）創建一個按鈕。
我厭倦了這個解決方案：
from kivy.app import App
from kivy.metrics import dp
from kivy.lang import Builder
from kivy.properties import StringProperty
from kivy.uix.stacklayout import StackLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
# the rest
class Produkt:
def __init__(self, name, amount, market):
self.name = name
self.amount = amount
self.market = market
eklist = []
for i in range(0, 100):
nn = "Banane" str(i)
eklist.append(Produkt(nn, 0, "Baumarkt"))
# Define Screens
class FirstWindow(Screen):
pass
class SecondWindow(Screen):
pass
class ThirdWindow(Screen):
pass
class WindowManager(ScreenManager):
pass
"""Anfang der Chose"""
class Box(BoxLayout):
pass
# Gvar is a class I created for the purpose of transporting variable(s). Especially the selected shop.
class Gvar:
def __init__(self, var1):
self.var1 = var1
def get(self):
return self.var1
gvar = Gvar("default")
# SetBox ist the Class for changing the variable through the shop selection menu.
class SetBox(BoxLayout):
def set(self, market):
gvar.var1 = market
print("Set")
print(gvar.var1)
class BLE(BoxLayout):
pass
# This is the Menus which makes Problems.
class SLE(StackLayout):
def __init__(self, **kwargs):
super().__init__(**kwargs)
for p in eklist:
# In theory, this if request should always be triggerd. In praxis, I made the else Request to debug.
# for Text normally would appear p.name, but I changed it for debugging. Text shown(gvar.var1) is "default".
if p.market == str(gvar.get()):
b = Button(text=str(gvar.get()), size_hint=(None, None), color="blue", size=(dp(200), dp(100)),
on_press=lambda *args: self.test1(*args, str(p.name)))
b.prod = p
self.add_widget(b)
else:
b = Button(text=str(gvar.get()), size_hint=(None, None), color="green", size=(dp(200), dp(100)),
on_press=lambda *args: self.test1(*args, str(p.name)))
b.prod = p
self.add_widget(b)
market = None
# test 1 is a placeholder for a Backend funktion
# Here I print the Produkt and gvar.var1, to debug. Here it get for gvar.var1 the in the GUI selected Value.
def test1(self, b, i):
print("Initialize test2, please wait...")
print(b.prod.name, b.prod.amount, b.prod.market, gvar.var1)
"""Ende der Chose"""
kv = Builder.load_file('einkaufsliste.kv')
class EinkaufsApp(App):
def build(self):
return kv
if __name__ == '__main__':
EinkaufsApp().run()
這是 Kivy 檔案。
WindowManager:
FirstWindow:
SecondWindow:
ThirdWindow:
<FirstWindow>:
name: "first"
Box:
orientation: "vertical"
size :root.width, root.height
Label:
text: "Hauptmenü"
size_hint: 1, .2
font_size: 32
Button:
text: "Einkaufen"
font_size: 32
background_normal: ' '
background_color: "#666e00"
on_release:
app.root.current = "third"
root.manager.transition.direction = "left"
Button:
text: "Einkaufsliste updaten"
font_size: 32
background_normal: ' '
background_color: "#660000"
on_release:
app.root.current = "second"
root.manager.transition.direction = "left"
<SecondWindow>:
name: "second"
BLE:
id: BLE
orientation: "vertical"
Button:
text: "to first"
size_hint: 1, .1
font_size: 24
on_release:
app.root.current = "first"
root.manager.transition.direction = "right"
TextInput:
multiline: False
size_hint: 1, .1
SVE:
<ThirdWindow>:
name: "third"
SetBox:
orientation: "vertical"
size :root.width, root.height
id:SetBox
Box:
orientation: "horizontal"
size_hint: 1, .4
Button:
text: "to first"
size_hint: .2, 1
font_size: 24
on_release:
app.root.current = "first"
root.manager.transition.direction = "right"
Label:
text: "Markt ausw?hlen"
size_hint: .8, 1
font_size: 32
Button:
text: "Supermarkt"
font_size: 32
background_normal: ' '
background_color: "#a1b2e3"
on_release:
app.root.current = "second"
root.manager.transition.direction = "left"
on_press: SetBox.set("Supermarkt")
Button:
text: "Drogerie"
font_size: 32
background_normal: ' '
background_color: "#c7bbc9"
on_release:
app.root.current = "second"
root.manager.transition.direction = "left"
on_press: SetBox.set("Drogerie")
Button:
text: "Baumarkt"
font_size: 32
background_normal: ' '
background_color: "#b4eeb4"
on_release:
app.root.current = "second"
root.manager.transition.direction = "left"
on_press: SetBox.set("Baumarkt")
Button:
text: "Elektroger?tefachhandel"
font_size: 32
background_normal: ' '
background_color: "#f4c2c2"
on_release:
app.root.current = "second"
root.manager.transition.direction = "left"
on_press: SetBox.set("Elektroger?tefachhandel")
<SVE@ScrollView>:
SLE:
id: Scrollwin
size_hint: 1, None
height: self.minimum_height
<SLE>:
# orientation: "rl-bt"
# spacing: "1dp", "1dp"
</code></pre>
我認為問題是，在我更改變數之前，kivy 創建了整個 GUI。有沒有辦法重新加載螢屏或者我必須為每個市場/商店制作另一個螢屏？
uj5u.com熱心網友回復：
有可能做你想做的事。您必須將專案添加到相應的布局中。我會給你一個我前段時間做的專案的例子：
class ExmapleApp(App):
def build(self):
#Create GridLayout where you will add and remove widgets
self.gridRooms = gridRooms = GridLayout(cols=10, padding=10, spacing=10,
row_force_default=True, row_default_height=50, size_hint_y=None)
gridRooms.bind(minimum_height=gridRooms.setter('height'))
# Generate 10 Rooms items
for i in range(10):
labl = NewLabel() #Instace of NewLabel
labl.num = str(i 1) #Number of room
labl.roomName = "Room " str(labl.num) # Room name
labl.filename = '12916_sweet_trip_mm_kwik_mod_01.wav'
roomsList.append(labl) #This add the room to a list for further reference
gridRooms.add_widget(labl) #This add the rooms to a grid
這是到目前為止的樣子：
最后，您可以將小部件添加到該 GridLayout：
#Create the object you want to Add
labl = NewLabel() #Instace of NewLabel
labl.num = str(11) #Number of room
labl.roomName = "Room " str(labl.num) # Room name
labl.filename = '12916_sweet_trip_mm_kwik_mod_01.wav'
roomsList.append(labl) #This add the room to a list for further reference
#This add the widgets 3 secs after the program starts
Clock.schedule_once(lambda x: gridRooms.add_widget(roomsList[10]), 3) #Add room 11
您甚至可以在每次按下按鈕時進行回呼以創建新的小部件。要洗掉一個小部件：
gridRooms.remove_widget(roomsList[10]) #Removes Room 11
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