main.py 文件源码

def switch_screen(self, style = 'slide', screen_to_switch = None, clear = False, prompt = None, *args):
        '''
        switch screen with given transition
        if screen is not defined it will switch to the last remembered screen (screen variable: last_screen)
        if clear is true it will overwrite screen variable: last_screen
        '''
        # #from kivy.uix.screenmanager import ScreenManager, FadeTransition#, SlideTransition, SwapTransition, WipeTransition, FallOutTransition, RiseInTransition
        # #from kivy.garden.moretransitions import BlurTransition#,PixelTransition,RippleTransition,RVBTransition

        # #app = App.get_running_app()
        # #self.last_screen = app.root.current
        # #SlideTransition, SwapTransition, WipeTransition, FallOutTransition, RiseInTransition, FadeTransition
        # #PixelTransition,RippleTransition,BlurTransition,RVBTransition

        # transitions = { #'rise'  : RiseInTransition(),
        #                 #'fall'  : FallOutTransition(),
        #                 'slide' : SlideTransition(),
        #                 #'blur' : BlurTransition(),
        #                 #'fade'  : FadeTransition()  }
        # #transition = SlideTransition(direction="left")
        # self.transition = transitions[style]    # setting transition style
        self.transition.direction = 'down'
        self.transition.duration = self.duration
        cached_screen = self.current            # caching current screen to write it later as last_screen
        if screen_to_switch:
            ''' if there is target screen defined then switch to it '''
            self.current = screen_to_switch
            if prompt:
                self.get_screen(self.current).set_prompt(prompt)
        else:
            ''' else switch to last+screen '''
            self.current = self.get_screen(self.current).last_screen
        if self.get_screen(self.current).last_screen is None:
            ''' if current (newly switched) screen has no last_screen defined, then define it now from cached_screen '''
            self.get_screen(self.current).last_screen = cached_screen
        elif clear == True:
            ''' if clear is forced, then overwrite current last_screen with cached screen anyway '''
            self.get_screen(self.current).last_screen = cached_screen