似乎很多人在使用 Kivy 的 on_press 参数时遇到了麻烦，但我还没有找到我的问题的答案......这是正在发生的事情：我开始使用 python/kivy 中的第一个应用程序。我知道python，但可能对类还不够……我可以创建一个按钮，带有一个打开弹出窗口的on_press操作。现在的目标如下：我有一个函数 affiche_grille，它在屏幕上显示一个带有线条的网格。在每个方块内，我创建了一个带有文本（数字）的按钮。这行得通。我想在这些按钮上绑定一个 on_press 事件：但是现在，语法不再起作用......也许是因为按钮是在“with self.canvas”指令中创建的，而 self.function 不是再合适不过了吗？
这是（编辑后完成）代码：
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.popup import Popup
from kivy.graphics import Color, Line
from kivy.core.window import Window
from kivy.core.text.text_layout import layout_text
from kivy.uix.floatlayout import FloatLayout
import numpy as np
from functools import partial # for on_press syntax
class Ecran_Principal(BoxLayout):
def build(self):
self.orientation='vertical'
self.liste_txt = np.zeros([9,9], dtype=object) # will contain Label
self.grille_affichee = np.zeros([9,9])
self.lGrille() # layout for the grid
self.lMenu() # layout for the menu
def lGrille(self):
LayGrille = GridLayout(cols=1,size_hint_y=0.8)
# window dimensions, in pixels
(L, H) = Window.size
H = int(0.8*H) # because of the 20% menu
if L > H: # landscape format - computer case
self.ymin = int(0.25*H) + int(0.05*H)
self.delta = int(0.1*H)
self.xmin = int((L-9*self.delta)/2.)
else: # portrait format - phone case
self.xmin = int(0.05*L)
self.delta = int(0.1*L)
self.ymin = int(0.25*H) + int((H-9*self.delta)/2.)
# end dimensions
self.deltaxrel = self.delta/H
self.deltayrel = self.delta/L
# grid definition (without numbers)
with self.canvas:
Color(1, 1, 1) # white
# automatic line traces
for i in range(4):
# big vertical lines
ymax = self.ymin+9*self.delta
xligne = self.xmin+i*3*self.delta
Line(points=[xligne, self.ymin, xligne, ymax], width=2)
# big horizontal lines
xmax = self.xmin+9*self.delta
yligne = self.ymin+i*3*self.delta
Line(points=[self.xmin, yligne, xmax, yligne], width=2)
# little intermediary lines
for ipetit in range(3):
if i ==3:
break
xpetit = xligne + ipetit*self.delta
Line(points=[xpetit, self.ymin, xpetit, ymax], width=1)
ypetit = yligne + ipetit*self.delta
Line(points=[self.xmin, ypetit, xmax, ypetit], width=1)
# end little lines
# end for
# grid display :
self.affiche_grille()
self.add_widget(LayGrille)
# end with
def affiche_grille(self):
# I tried to remove this 'with' instruction and does not change anything
with self.canvas:
for i in range(9): # line
for j in range(9): # colomn
valeur = self.grille_affichee[i,j]
val = "{0:.0f}".format(valeur)
layout = FloatLayout(size=(self.xmin + (j+0.5)*self.delta,
self.ymin + (8.5-i)*self.delta),
pos_hint=(None, None))
montexte = Button(text=val,
size_hint=(self.deltaxrel,
self.deltayrel),
pos=(self.xmin + (j+0.5)*self.delta,
self.ymin + (8.5-i)*self.delta),
background_color = (0,0.2,0,1),
background_normal = '',
on_press=partial(self.choisir_valeur, i, j)
)
self.liste_txt[i, j] = montexte
# THE BUTTONS AND THE TEXT ARE DISPLAYED,
# BUT NOTHING HAPPENS WHEN YOU PRESS THE BUTTONS
layout.add_widget(self.liste_txt[i, j])
# end j
# end i
# end with
def choisir_valeur(self, i, j):
print("Hello !") # NEVER DISPLAYED :(
#champ = TextInput(text=str(self.grille_affichee[i, j]),
# font_size=30,
# focus=True,
# multiline=False)
champ = Button(text=str(self.grille_affichee[i, j]))
popup = Popup(title='Value in line {} - colomn {}'.format(i, j),
content=champ,
size_hint=(0.5,0.5))
champ.bind(on_press=popup.dismiss)
popup.open()
def lMenu(self):
LayMenu = GridLayout(cols=2, rows=2, size_hint_y=0.2)
# Bouton Résoudre
self.BoutonResoudre=Button(text='Resoudre',size_hint=(0.5,0.1),pos_hint={'left': 0.},background_color=[0.9,0.9,0.9,1])
self.BoutonResoudre.bind(on_press=self.resoudre)
LayMenu.add_widget(self.BoutonResoudre)
# Bouton Remplir
self.BoutonScanner=Button(text='Scanner',size_hint=(0.5,0.1),pos_hint={'left': 0.5},background_color=[0.9,0.9,0.9,1])
self.BoutonScanner.bind(on_press=self.scanner)
LayMenu.add_widget(self.BoutonScanner)
# Bouton Indice
self.BoutonIndice=Button(text='Indice',size_hint=(0.5,0.1),pos_hint={'bottom': 0.},background_color=[0.9,0.9,0.9,1])
self.BoutonIndice.bind(on_press=self.indice)
LayMenu.add_widget(self.BoutonIndice)
# Bouton Quitter
self.BoutonQuitter=Button(text='Quitter',size_hint=(0.5,0.1),background_color=[0.9,0.9,0.9,1])
self.BoutonQuitter.bind(on_press=self.quitter)
LayMenu.add_widget(self.BoutonQuitter)
self.add_widget(LayMenu)
def resoudre(self, instance):
content = Button(text='Resolution du sudoku', font_size=20)
popup = Popup(title='RESOLUTION',content=content, size_hint=(0.5,0.5))
content.bind(on_press=popup.dismiss)
popup.open()
def scanner(self, instance):
content = Button(text='Remplissage auto par photo', font_size=20)
popup = Popup(title='SCAN PHOTO',content=content, size_hint=(0.5,0.5))
content.bind(on_press=popup.dismiss)
popup.open()
def indice(self, instance):
content = Button(text='Affichage d\'un indice', font_size=20)
popup = Popup(title='INDICE',content=content, size_hint=(0.5,0.5))
content.bind(on_press=popup.dismiss)
popup.open()
def quitter(self, instance):
content = Button(text='Au revoir !', font_size=20)
popup = Popup(title='QUITTER',content=content, size_hint=(0.5,0.5))
content.bind(on_press=exit())
popup.open()
class Sudoku(App):
def build(self):
ecran=Ecran_Principal()
ecran.build()
return ecran
if __name__ == '__main__':
Sudoku().run()
一切都被解释了，但网格内的按钮不起作用......我已经看到了 functools.partial() 提示，但这似乎还不够......
有谁知道发生了什么？我对 python 中的类不是很熟悉，我当然错过了一些东西。提前谢谢你，如果问题太基本，对不起。