Kivy ScreenManager不切换屏幕(纯python)
我对Kivy很陌生,我有一个自己无法解决的问题。 我有一个简单的应用程序,我想在图像之间切换(主屏幕) 代码如下:Kivy ScreenManager不切换屏幕(纯python),python,kivy,Python,Kivy,我对Kivy很陌生,我有一个自己无法解决的问题。 我有一个简单的应用程序,我想在图像之间切换(主屏幕) 代码如下: IMAGE_SIZE = (640, 480) class MainScreen(Screen): def __init__(self, path, **kwargs): super(MainScreen, self).__init__(**kwargs) Window.size = (IMAGE_SIZE[0], IMAGE_SIZE[
IMAGE_SIZE = (640, 480)
class MainScreen(Screen):
def __init__(self, path, **kwargs):
super(MainScreen, self).__init__(**kwargs)
Window.size = (IMAGE_SIZE[0], IMAGE_SIZE[1])
with self.canvas:
self.bg = Image(path)
self.bind(pos=self.update_bg)
self.bind(size=self.update_bg)
self._keyboard = Window.request_keyboard(
self._keyboard_closed, self, 'text')
self._keyboard.bind(on_key_down=self._on_keyboard_down)
def update_bg(self, *args):
self.bg.pos = self.pos
self.bg.size = self.size
def _keyboard_closed(self):
print('My keyboard have been closed!')
self._keyboard.unbind(on_key_down=self._on_keyboard_down)
self._keyboard = None
def _on_keyboard_down(self, keyboard, keycode, text, modifiers):
if keycode[1] == 'escape':
keyboard.release()
if keycode[1] == 'enter':
print('before enter', screen_manager.current_screen)
screen_manager.transition.direction = 'left'
screen_manager.current_screen = scree_1
print('after enter',screen_manager.current_screen)
return True
screen_manager = None
scree_1 = MainScreen(path_1, name="1")
scree_2 = MainScreen(path_2, name="2")
class MyApp(App):
def build(self):
global screen_manager
screen_manager = ScreenManager()
screen_manager.add_widget(scree_2)
screen_manager.add_widget(scree_1)
return screen_manager
if __name__ == '__main__':
MyApp().run()
我进行了打印,以查看screen manager中是否有更改:
在我看来,经理确实改变了屏幕,但我还是看到了同样的画面
我已经看过这个问题了,我没有发现任何有用的东西
如果有人知道我做错了什么,我将感谢任何帮助/建议
更新:
@JohnAnderson在评论中注意到,我应该交换屏幕的名称,而不是屏幕本身,但是没有任何变化。您必须操作的是
screen\u manager.current
而不是screen\u manager.current\u screen
您还必须通过名称来引用
屏幕
这是您的代码,正在工作:
IMAGE_SIZE = (640, 480)
class MainScreen(Screen):
def __init__(self, path, **kwargs):
super(MainScreen, self).__init__(**kwargs)
Window.size = (IMAGE_SIZE[0], IMAGE_SIZE[1])
with self.canvas:
self.bg = Image(source=path)
self.bind(pos=self.update_bg)
self.bind(size=self.update_bg)
self._keyboard = Window.request_keyboard(self._keyboard_closed, self, 'text')
self._keyboard.bind(on_key_down=self._on_keyboard_down)
def update_bg(self, *args):
self.bg.pos = self.pos
self.bg.size = self.size
def _keyboard_closed(self):
print('My keyboard have been closed!')
self._keyboard.unbind(on_key_down=self._on_keyboard_down)
self._keyboard = None
def _on_keyboard_down(self, keyboard, keycode, text, modifiers):
if keycode[1] == 'escape':
keyboard.release()
if keycode[1] == 'enter':
print('before enter', screen_manager.current)
screen_manager.transition.direction = 'left'
screen_manager.current = "1"
print('after enter', screen_manager.current)
return True
screen_manager = None
scree_1 = MainScreen(path_1, name="1")
scree_2 = MainScreen(path_2, name="2")
class MyApp(App):
def build(self):
global screen_manager
screen_manager = ScreenManager()
screen_manager.add_widget(scree_2)
screen_manager.add_widget(scree_1)
return screen_manager
if __name__ == '__main__':
MyApp().run()
经过一番挖掘,我找到了另一个答案。 我还可以使用:
screen_manager.switch_to(screen_1, direction='left')
您需要在
Screen\u manager.current=
中使用屏幕的指定名称。您指定的名称为“1”和“2”。因此,该行应该看起来像screen\u manager.current=“1”
您不能直接更改“current\u screen”。@JohnAnderson是的,您是对的,但我刚刚将名称更正为“1”,没有任何更改。您不能直接更改“当前屏幕”-但我能做什么?实际上,我会使用kv语言来实现这个目的,但是我没有发现任何关于kv语言和键盘事件的信息。非常感谢!