從py文件到kv文件的值。使用展示示例

Question

我想將main.py中的計時器的值傳遞給exit.kv文件中的ProgressBar，但使用文件結構（如showcase示例）。我試圖製作一個定時按鈕，這樣程序不會意外退出，我需要按住按鈕幾秒鐘。

已經嘗試了很多東西，但我找不到解決方案。

該項目需要（使用我的樹莓派一個DAC）通過在main.py更多價值，以幾個不同的.kv文件

這是我第Kivy項目，但也是我的第一個Python項目，所以學習曲線對我來說很陡峭。

---

編輯：

我需要的是在main.py文件中exit.kv文件傳遞（exit_time）值的值的進度（exit_bar）以顯示在退出程序之前需要多長時間按下按鈕（exit_button）。

程序運行時，蟒蛇控制檯會做倒計時，但我不能讓它的進度顯示（或標籤上的事exit.kv文件。

如何找到，如果我需要使用的應用程序或根或screen.ids.exit_bar.value或者什麼又

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編輯：。。？解決方案

我刪除了有關計時器在main.py一切，把這個進入main.py;

# 
# The Exit Timer, counting up to 20 from 0 before exiting. 
# If Press button start Timer. If button up, reset timer 
# 

    def my_callback(self, dt): 
     global exit_time 
     exit_time += 1 
     if exit_time == 101: 
      sys.exit("piMote stopped!") 
     self.time = exit_time 

    def start_exit_timer(self): 
     Clock.schedule_interval(self.my_callback, 0.01) 

    def stop_exit_timer(self): 
     global exit_time 
     Clock.unschedule(self.my_callback) 
     Clock.schedule_once(self.my_callback,0) 
     exit_time = -1 

然後，我改變了對exit.ky的一部分

ProgressBar: 
     id: exit_bar 
     max: 100 
     value: app.time 
     size_hint_x: .3 
     size_hint_y: None 
     height: '10dp' 

在現實中，所有我需要做的是將self.time = exit_time」

---

main.py

from time import time 
from kivy.app import App 
from os.path import dirname, join 
from kivy.lang import Builder 
from kivy.properties import NumericProperty, StringProperty, BooleanProperty,\ 
    ListProperty 
from kivy.clock import Clock 
from kivy.uix.screenmanager import Screen 
from kivy.uix.checkbox import CheckBox 
import os 
import sys 
from kivy.config import Config 


exit_time = 0 
timer_start = 0 

class ShowcaseScreen(Screen): 
    fullscreen = BooleanProperty(False) 
    def add_widget(self, *args): 
     if 'content' in self.ids: 
      return self.ids.content.add_widget(*args) 
     return super(ShowcaseScreen, self).add_widget(*args) 

class ShowcaseApp(App): 
    index = NumericProperty(-1) 
    current_title = StringProperty() 
    time = NumericProperty(0) 
    screen_names = ListProperty([]) 
    hierarchy = ListProperty([]) 
    exit_time = NumericProperty(21) 

    def build(self): 
     self.title = 'hello world' 
     self.screens = {} 
     self.available_screens = [ 
      'Exit'] 
     self.screen_names = self.available_screens 
     curdir = dirname(__file__) 
     self.available_screens = [join(curdir, 
      '{}.kv'.format(fn)) for fn in self.available_screens] 
     screen = self.load_screen(self.index +1) 
     self.current_title = screen.name 

# 
# choose the right screen from spinner 
# 

    def on_current_title(self, instance, value): 
     self.root.ids.spnr.text = value 

    def go_screen(self, idx): 

     print self.index 
     self.index = idx 
     self.root.ids.sm.switch_to(self.load_screen(idx), direction='left') 

    def load_screen(self, index): 
     if index in self.screens: 
      return self.screens[index] 
     screen = Builder.load_file(self.available_screens[index].lower()) 
     self.screens[index] = screen 
     return screen 

# 
# timer start for joystick and exit timer 
# 

    def __init__(self,**kwargs): 
     super(ShowcaseApp,self).__init__(**kwargs) 
     Clock.schedule_interval(self.my_timer, 0.1) 

# 
# The Exit Timer, counting up to 20 from 0 before exiting. 
# If Press button start Timer. If button up, reset timer 
# 

    def my_timer(screen, dt): 
     if timer_start == 1: 
      global exit_time 
      exit_time += 1 
      if exit_time == 21: 
       sys.exit("piMote stopped!") 
      print exit_time 
      return exit_time + 7 
     ################################################################# 
     # Need to do something here to make the timer-progressbar  # 
     # move, counting how long the button is pressed    # 
     ################################################################# 

    def start_exit_timer(self): 
     global timer_start 
     timer_start = 1 

    def stop_exit_timer(self): 
     global timer_start, exit_time 
     exit_time = 0 
     timer_start = 0 

if __name__ == '__main__': 
    ShowcaseApp().run() 

showcase.kv

#:kivy 1.8.0 
#:import Factory kivy.factory.Factory 

<ActionSpinnerOptions@SpinnerOption> 
    background_color: .4, .4, .4, 1 

<ActionSpinner@Spinner+ActionItem> 
    canvas.before: 
     Color: 
      rgba: 0.128, 0.128, 0.128, 1 
     Rectangle: 
      size: self.size 
      pos: self.pos 
    border: 27, 20, 12, 12 
    #background_normal: 'atlas://data/images/defaulttheme/action_group' 
    option_cls: Factory.ActionSpinnerOptions 

<ShowcaseScreen>: 
    ScrollView: 
     do_scroll_x: False 
     do_scroll_y: False if root.fullscreen else (content.height > root.height - dp(16)) 
     AnchorLayout: 
      size_hint_y: None 
      height: root.height if root.fullscreen else max(root.height, content.height) 
      GridLayout: 
       id: content 
       cols: 1 
       spacing: '8dp' 
       padding: '8dp' 
       size_hint: (1, 1) if root.fullscreen else (.8, None) 
       height: self.height if root.fullscreen else self.minimum_height 

BoxLayout: 
    orientation: 'vertical' 

    canvas.before: 
     Color: 
      rgb: .6, .6, .6 
     Rectangle: 
      size: self.size 
      #source: 'data/background.png' 

    ActionBar: 

     ActionView: 
      id: av 
      ActionPrevious: 
       title: 'piMote' 

      ActionSpinner: 
       id: spnr 
       important: True 
       text: 'Jump to Screen' 
       values: app.screen_names 
       on_text: 
        if sm.current != args[1]:\ 
        idx = app.screen_names.index(args[1]);\ 
        app.go_screen(idx) 

    ScreenManager: 
     id: sm 
     on_current_screen: 
      spnr.text = args[1].name 
      idx = app.screen_names.index(args[1].name) 
      if idx > -1: app.hierarchy.append(idx) 

exit.kv

ShowcaseScreen: 
    name: 'Exit' 

    Label: 
     id: exit_label1 
     text: "Are you really sure\n you want to quit?" 
     size_hint_y: None 
     height: '36dp' 

    ProgressBar: 
     id: exit_bar 
     max: 20 
     #value: app.my_timer() 
     size_hint_x: .3 
     size_hint_y: None 
     height: '10dp' 

    Button: 
     id: exit_button 
     text: "Yes" 
     size_hint_x: .2 
     size_hint_y: None 
     height: '48dp' 
     on_press: app.start_exit_timer() 
     on_release: app.stop_exit_timer() 

Answer 1

您的解決方案是有點太複雜了......你可以衡量，因爲新聞界說，通過再決定退出的時間。

#forget about all the timers code... 
import time #gonna need this 
EXIT_BUTTON_TIME = 2.0 # 2 seconds is OK? 
... 

    def exit_button_pressed(self): 
     self.exit_pressed = time.time() 


    def exit_button_release(self): 
     if time.time() - self.exit_pressed > EXIT_BUTTON_TIME: 
      exit() # or something else you want to do 

還要更改KV文件中的函數名稱...

... 
    on_press: app.exit_button_pressed() 
    on_release: app.exit_button_release() 

我不是說你的方法不能的工作，但它更復雜（import this）