Kivy 위젯 제작이 너무 느리거나 잘못 했나요?

Question

내 응용 프로그램의 위젯 생성 속도가 느려서이 간단한 테스트 응용 프로그램을 만들어 확인했습니다. 여기에는 두 개의 화면이 있으며 각각에는 간단한 위젯 목록이 들어 있습니다.

앱 :

from kivy.app import App 
from kivy.uix.screenmanager import ScreenManager, Screen 
from kivy.uix.boxlayout import BoxLayout 
from kivy.properties import ObjectProperty, StringProperty 
from kivy.clock import Clock 

from time import time 

class ListScreen(Screen): 

    items_box = ObjectProperty(None) 

    def on_enter(self): 
     start = time() 
     for i in range(0,50): 
      self.items_box.add_widget(ListItem('Item '+str(i))) 
     self.items_box.bind(minimum_height=self.items_box.setter('height')) 
     print time()-start 

    def on_leave(self): 
     self.items_box.clear_widgets() 

class ListItem(BoxLayout): 

    title = StringProperty('') 

    def __init__(self, title, **kwargs): 
     super(ListItem, self).__init__(**kwargs) 
     self.title = title 

class ListApp(App): 

    sm = ScreenManager() 
    screens = {} 

    def build(self): 
     self.__create_screens() 
     ListApp.sm.add_widget(ListApp.screens['list1']) 
     Clock.schedule_interval(self._switch, 1) 
     return ListApp.sm 

    def _switch(self, *args): 
     ListApp.sm.switch_to(ListApp.screens['list1' if ListApp.sm.current != 'list1' else 'list2']) 

    def __create_screens(self): 
     ListApp.screens['list1'] = ListScreen(name='list1') 
     ListApp.screens['list2'] = ListScreen(name='list2') 

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

list.kv 파일 :

11-28 11:44:09.525 1848 2044 I python : 0.5793800354 
11-28 11:44:10.853 1848 2044 I python : 0.453143119812 
11-28 11:44:12.544 1848 2044 I python : 0.633069992065 
11-28 11:44:13.697 1848 2044 I python : 0.369570970535 
11-28 11:44:14.988 1848 2044 I python : 0.594089031219 
11-28 11:44:16.017 1848 2044 I python : 0.339677095413 
11-28 11:44:17.315 1848 2044 I python : 0.58710193634 
11-28 11:44:18.403 1848 2044 I python : 0.359042882919 
11-28 11:44:19.741 1848 2044 I python : 0.613200187683 
11-28 11:44:20.820 1848 2044 I python : 0.359098911285 
11-28 11:44:22.139 1848 2044 I python : 0.60958814621 
11-28 11:44:23.199 1848 2044 I python : 0.354372024536 
11-28 11:44:24.538 1848 2044 I python : 0.643312931061 
11-28 11:44:25.606 1848 2044 I python : 0.360656023026 
11-28 11:44:26.995 1848 2044 I python : 0.682018995285 
11-28 11:44:28.140 1848 2044 I python : 0.393831014633 
11-28 11:44:29.470 1848 2044 I python : 0.591700077057 
11-28 11:44:30.525 1848 2044 I python : 0.346837043762 
11-28 11:44:31.818 1848 2044 I python : 0.607005834579 
11-28 11:44:32.877 1848 2044 I python : 0.36404299736 
11-28 11:44:34.149 1848 2044 I python : 0.586351156235 
11-28 11:44:35.195 1848 2044 I python : 0.349910974503 
11-28 11:44:36.484 1848 2044 I python : 0.588956832886 
11-28 11:44:37.547 1848 2044 I python : 0.367785930634 
11-28 11:44:38.886 1848 2044 I python : 0.639610052109 
11-28 11:44:40.007 1848 2044 I python : 0.394254922867 
11-28 11:44:41.464 1848 2044 I python : 0.732916116714 

정말, 어서 내 장치 (모토 G)에

<ListScreen>: 
    items_box: items_box 
    BoxLayout: 
     orientation: "vertical" 
     AnchorLayout: 
      size_hint_y: 0.1 
      padding: self.width*0.1, self.height*0.05 
      Label: 
       font_size: root.height*0.05 
       text: "Some list" 
     ScrollView: 
      size_hint_y: 0.9 
      size: self.size 
      BoxLayout: 
       id: items_box 
       orientation: "vertical" 
       padding: self.width*0.1, 0 
       size_hint_y: None 

<ListItem>: 
    orientation: "horizontal" 
    size_hint_y: None 
    height: app.sm.height*0.1 
    Label: 
     font_size: app.sm.height*0.025 
     text: root.title 
     size_hint_x: 0.9 
     text_size: self.size 
     valign: "middle" 
    CheckBox 
     size_hint_x: 0.1 

로그인? 레이블과 체크 박스가있는 50 개의 행 목록을 만들려면 평균 0.5 초가 필요합니까? 아니면 내가 잘못하고있는거야?

Answer 1

솔루션은 Alexander Taylor (Kivy 개발자 중 한 명) 덕분에 발견되었습니다. 여기에 그의 대답은 다음과 같습니다

위젯 생성 특히 위젯에 포함 된 내용에 따라, 상대적으로 느립니다.

예를 들어 큰 목록을 만들 경우 보통 RecycleView를 사용하는 것이 좋습니다. 스크롤하는 동안 더 작은 수의 위젯을 재사용하도록 최적화합니다.

그래서 시도했습니다.

앱 :

from kivy.app import App 
from kivy.uix.screenmanager import ScreenManager, Screen 
from kivy.properties import ObjectProperty 
from kivy.clock import Clock 

from time import time 

class ListScreen(Screen): 

    recycle_view = ObjectProperty(None) 
    items_box = ObjectProperty(None) 

    def on_enter(self): 
     start = time() 
     for i in range(0,50): 
      self.recycle_view.data.append({'title': 'item'+str(i)}) 
     print time()-start 

    def on_leave(self): 
     self.recycle_view.data = [] 

class ListApp(App): 

    sm = ScreenManager() 
    screens = {} 

    def build(self): 
     self.__create_screens() 
     ListApp.sm.add_widget(ListApp.screens['list1']) 
     Clock.schedule_interval(self._switch, 1) 
     return ListApp.sm 

    def _switch(self, *args): 
     ListApp.sm.switch_to(ListApp.screens['list1' if ListApp.sm.current != 'list1' else 'list2']) 

    def __create_screens(self): 
     ListApp.screens['list1'] = ListScreen(name='list1') 
     ListApp.screens['list2'] = ListScreen(name='list2') 

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

list.kv 파일 :

<ListScreen>: 
    recycle_view: recycle_view 
    items_box: items_box 
    BoxLayout: 
     orientation: "vertical" 
     AnchorLayout: 
      size_hint_y: 0.1 
      padding: self.width*0.1, self.height*0.05 
      Label: 
       font_size: root.height*0.05 
       text: "Some list" 
     RecycleView: 
      id: recycle_view 
      size_hint: 1, 0.9 
      viewclass: "ListItem" 
      RecycleBoxLayout: 
       id: items_box 
       orientation: "vertical" 
       padding: self.width*0.1, 0 
       default_size_hint: 1, None 
       size_hint: 1, None 
       height: self.minimum_height 

<ListItem@BoxLayout>: 
    orientation: "horizontal" 
    size_hint: 1, None 
    height: app.sm.height*0.1 
    title: '' 
    Label: 
     font_size: app.sm.height*0.025 
     text: root.title 
     size_hint_x: 0.9 
     text_size: self.size 
     valign: "middle" 
    CheckBox 
     size_hint_x: 0.1 

로그인 동일한 장치 (모토 G) 중 :

11-29 13:11:58.196 13121 13203 I python : 0.00388479232788 
11-29 13:11:59.192 13121 13203 I python : 0.00648307800293 
11-29 13:12:00.189 13121 13203 I python : 0.00288391113281 
11-29 13:12:01.189 13121 13203 I python : 0.00324606895447 
11-29 13:12:02.194 13121 13203 I python : 0.00873804092407 
11-29 13:12:03.188 13121 13203 I python : 0.00265002250671 
11-29 13:12:04.209 13121 13203 I python : 0.00614500045776 

100 배 이상 빠르게! 그것은 굉장.