How to loop in Kivy using kv language? - python-3.x

Question

I am trying to create an app of a game that i play with my friends.
I have this code and i want to loop the list "jugadores" in FourWindow.
import kivy
kivy.require('1.9.0')
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.properties import ObjectProperty
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang.builder import Builder
from kivy.core.window import Window
Window.size = (300, 1280)
Jugadores = []
CantidadDeCartas = 0
Objetivo = 0
Manos = 0
class MainWindow(Screen):
cartas = ObjectProperty(None)
objetivo = ObjectProperty(None)
def btn(self):
CantidadDeCartas = int(self.cartas.text)
Objetivo = int(self.objetivo.text)
self.cartas.text = ""
self.objetivo.text = ""
class SecondWindow(Screen):
cartas = ObjectProperty(None)
objetivo = ObjectProperty(None)
class ThirdWindow(Screen):
def btn3(self):
Nombre = self.njugador.text
Jugadores.append(Nombre)
self.njugador.text = ""
self.jugador.text = str(Jugadores)
print(Jugadores)
def btn4(self):
self.njugador.text = ""
Jugadores.clear()
self.jugador.text = ""
def btn5(self):
Jugadores.reverse()
if len(Jugadores) != 0:
largo = Jugadores.count(self)
Jugadores.pop(largo)
Jugadores.reverse()
print(Jugadores)
self.jugador.text = str(Jugadores)
else:
self.jugador.text = ""
class FourWindow(Screen):
pass
class WindowManager(ScreenManager):
pass
kv = Builder.load_file("tim4.kv")
class tim4App(App):
def build(self):
return kv
if __name__ == "__main__":
tim4App().run()
KIVY
WindowManager:
MainWindow:
SecondWindow:
ThirdWindow:
FourWindow:
<MainWindow>:
name: "main"
cartas : cartas
objetivo : objetivo
GridLayout:
cols:1
GridLayout:
cols: 2
Label:
text:"Cartas: "
TextInput:
id: cartas
multiline: False
input_type: "number"
input_filter: "int"
Label:
text:"Objetivo: "
TextInput:
id: objetivo
multiline: False
input_type: "number"
input_filter: "int"
Button:
text: "Siguiente>>"
on_release:
app.root.current= "second"
root.manager.screens[1].ids.carta.text = "Se juega con " + root.ids.cartas.text + " cartas"
root.manager.screens[1].ids.objetivo.text = "Se juega a " + root.ids.objetivo.text
root.manager.screens[3].ids.iduno.text = "Se juega con " + root.ids.cartas.text + " cartas"
root.manager.screens[3].ids.iddos.text = "Se juega a " + root.ids.objetivo.text
root.btn()
root.manager.transition.direction="left"
<SecondWindow>:
name: "second"
carta: carta
objetivo: objetivo
GridLayout:
cols:1
size: root.width, root.height
pos: 0, 0
Label:
id: carta
text: ""
Label:
id: objetivo
text: ""
GridLayout:
cols:2
Button:
text: "Ir Atrás"
on_release:
app.root.current= "main"
root.manager.transition.direction="right"
Button:
text: "Elegir Jugadores"
on_release:
app.root.current= "third"
root.manager.transition.direction="left"
<ThirdWindow>
name: "third"
njugador: njugador
jugador: jugador
empezar: empezar
GridLayout:
cols: 2
orientation: "horizontal"
GridLayout:
cols:1
TextInput:
id: njugador
text: "quien juega"
multiline: False
GridLayout:
cols:3
Button:
text: "Agregar Jugador"
on_press: root.btn3()
Button:
text:"Borrar Último"
on_press: root.btn5()
Button:
text:"Limpiar todo"
on_press: root.btn4()
GridLayout:
cols:1
orientation: "vertical"
Label:
id : jugador
text: ""
Button:
id: empezar
text:"Empezar Juego"
on_release:
app.root.current= "four"
root.manager.transition.direction="left"
<FourWindow>
name: "four"
iduno: iduno
iddos: iddos
idtres: idtres
GridLayout:
orientation:"horizontal"
rows: 3
Label:
id: iduno
text:""
Label:
id: iddos
text:""
Label:
id: idtres
text:"manos"
On FourWindow i want loop the list "Jugadores" to create labels. Theres is anyway of doing that through kv lenguage? Or how to do it on python file?

Answer 1

You can do it with an on_enter() method in your FourWindow class, or you can do it in kv by defining the on_enter method in kv. To do this, modify your FourWindow rule in the kv:
#: import Label kivy.uix.label.Label
<FourWindow>
name: "four"
iduno: iduno
iddos: iddos
idtres: idtres
on_pre_enter: for p in self.players: l=Label(text=p); grid.add_widget(l);
GridLayout:
id: grid # needed for the above code
rows: 3
Label:
id: iduno
text:""
Label:
id: iddos
text:""
Label:
id: idtres
text:"manos"
And modify your definition of the FourWindow class:
class FourWindow(Screen):
players = ObjectProperty(Jugadores)
The players object is just to provide access to the Jugadores list.