[英]kivy button press to go to one of multiple screens
假設我有一個kivy程序,其中第一個屏幕具有三個按鈕,每個按鈕都將您帶到另一個屏幕。 這些屏幕中的每個屏幕都包含一個按鈕,可將您帶到最終屏幕(同一屏幕)。 最終屏幕上有一個“后退”按鈕。 如何使最后一個屏幕上的“后退”按鈕將您帶回到上一個屏幕(上述3個中的1個)? 下面是一個粗略的圖表,可以更好地幫助可視化我的問題。
Screen 1
Start Screen --> Screen 2 --> Final Screen
Screen 3
到目前為止,最后一個屏幕上的“后退”按鈕可將您帶回到“開始”屏幕,但這不是我想要的。
我的python代碼:
from kivy.app import App
from kivy.uix.screenmanager import Screen, ScreenManager
class MyScreenManager(ScreenManager):
pass
# Branch Screen, takes you to S1, S2, or S3
class BRANCH(Screen):
pass
class S1(Screen):
pass
class S2(Screen):
pass
class S3(Screen):
pass
class FINAL_SCREEN(Screen):
pass
class MAINApp(App):
def build(self):
return MyScreenManager()
if __name__ == '__main__':
MAINApp().run()
我的獼猴桃語言代碼:
#:kivy 1.0.9
<MyScreenManager>:
BRANCH:
name: 'branch'
S1:
name: 'screen1'
S2:
name: 'screen2'
S3:
name: 'screen3'
FINAL_SCREEN:
name: 'final_screen'
<BRANCH>
FloatLayout:
Button:
text: 'Screen-1'
color: 1.0, 0.6, 0.0, 1
font_size: 30
size_hint_x: 0.50
size_hint_y: 0.25
pos_hint: {'x': 0.20, 'y': 0.75}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'screen1'
Button:
text: 'Screen-2'
color: 1.0, 0.6, 0.0, 1
font_size: 30
size_hint_x: 0.50
size_hint_y: 0.25
pos_hint: {'x': 0.20, 'y': 0.40}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'screen2'
Button:
text: 'Screen-3'
color: 1.0, 0.6, 0.0, 1
font_size: 30
size_hint_x: 0.50
size_hint_y: 0.25
pos_hint: {'x': 0.20, 'y': 0.05}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'screen3'
<S1>
FloatLayout:
Label:
pos_hint: {'x': 0.00, 'y': 0.20}
font_size: 35
text: 'this is SCREEN-1'
color: 1, 1, 1, 1
Button:
text: 'Forward'
color: 1.0, 0.6, 0.0, 1
font_size: 20
size_hint_x: 0.20
size_hint_y: 0.20
pos_hint: {'x': 0.40, 'y': 0.15}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'final_screen'
<S2>
FloatLayout:
Label:
pos_hint: {'x': 0.00, 'y': 0.20}
font_size: 35
text: 'me este SCREEN-2'
color: 1, 1, 1, 1
Button:
text: 'Onward'
color: 1.0, 0.6, 0.0, 1
font_size: 20
size_hint_x: 0.20
size_hint_y: 0.20
pos_hint: {'x': 0.40, 'y': 0.15}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'final_screen'
<S3>
FloatLayout:
Label:
pos_hint: {'x': 0.00, 'y': 0.20}
font_size: 35
text: 'something SCREEN-3'
color: 1, 1, 1, 1
Button:
text: 'Lets Go'
color: 1.0, 0.6, 0.0, 1
font_size: 20
size_hint_x: 0.20
size_hint_y: 0.20
pos_hint: {'x': 0.40, 'y': 0.15}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'final_screen'
<FINAL_SCREEN>
FloatLayout:
Label:
pos_hint: {'x': 0.00, 'y': 0.20}
font_size: 35
text: 'Final Screen'
color: 1, 1, 1, 1
Button:
text: 'Back'
color: 1.0, 0.6, 0.0, 1
font_size: 20
size_hint_x: 0.20
size_hint_y: 0.20
pos_hint: {'x': 0.40, 'y': 0.15}
on_release:
root.manager.transition.direction = 'right'
root.manager.current = 'branch'
任何幫助或建議,我們將不勝感激。
這是在Final
屏幕上使用StringProperty的一種解決方案。
我在進入最終屏幕時進行設置
root.manager.ids.final.previous = root.name
回去時我正在用它去這個屏幕
root.manager.current = root.previous
這是你的整個應用
from kivy.app import App
from kivy.uix.screenmanager import Screen, ScreenManager
from kivy.lang import Builder
from kivy.properties import StringProperty
kv_str = """
MyScreenManager:
BRANCH:
name: 'branch'
S1:
name: 'screen1'
S2:
name: 'screen2'
S3:
name: 'screen3'
FINAL_SCREEN:
id: final
name: 'final_screen'
<BRANCH>
FloatLayout:
Button:
text: 'Screen-1'
color: 1.0, 0.6, 0.0, 1
font_size: 30
size_hint_x: 0.50
size_hint_y: 0.25
pos_hint: {'x': 0.20, 'y': 0.75}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'screen1'
Button:
text: 'Screen-2'
color: 1.0, 0.6, 0.0, 1
font_size: 30
size_hint_x: 0.50
size_hint_y: 0.25
pos_hint: {'x': 0.20, 'y': 0.40}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'screen2'
Button:
text: 'Screen-3'
color: 1.0, 0.6, 0.0, 1
font_size: 30
size_hint_x: 0.50
size_hint_y: 0.25
pos_hint: {'x': 0.20, 'y': 0.05}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'screen3'
<S1>:
FloatLayout:
Label:
pos_hint: {'x': 0.00, 'y': 0.20}
font_size: 35
text: 'this is SCREEN-1'
color: 1, 1, 1, 1
Button:
text: 'Forward'
color: 1.0, 0.6, 0.0, 1
font_size: 20
size_hint_x: 0.20
size_hint_y: 0.20
pos_hint: {'x': 0.40, 'y': 0.15}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'final_screen'
root.manager.ids.final.previous = root.name
<S2>:
FloatLayout:
Label:
pos_hint: {'x': 0.00, 'y': 0.20}
font_size: 35
text: 'me este SCREEN-2'
color: 1, 1, 1, 1
Button:
text: 'Onward'
color: 1.0, 0.6, 0.0, 1
font_size: 20
size_hint_x: 0.20
size_hint_y: 0.20
pos_hint: {'x': 0.40, 'y': 0.15}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'final_screen'
root.manager.ids.final.previous = root.name
<S3>:
FloatLayout:
Label:
pos_hint: {'x': 0.00, 'y': 0.20}
font_size: 35
text: 'something SCREEN-3'
color: 1, 1, 1, 1
Button:
text: 'Lets Go'
color: 1.0, 0.6, 0.0, 1
font_size: 20
size_hint_x: 0.20
size_hint_y: 0.20
pos_hint: {'x': 0.40, 'y': 0.15}
on_release:
root.manager.transition.direction = 'left'
root.manager.current = 'final_screen'
root.manager.ids.final.previous = root.name
<FINAL_SCREEN>:
FloatLayout:
Label:
pos_hint: {'x': 0.00, 'y': 0.20}
font_size: 35
text: 'Final Screen'
color: 1, 1, 1, 1
Button:
text: 'Back'
color: 1.0, 0.6, 0.0, 1
font_size: 20
size_hint_x: 0.20
size_hint_y: 0.20
pos_hint: {'x': 0.40, 'y': 0.15}
on_release:
root.manager.transition.direction = 'right'
root.manager.current = root.previous
"""
class MyScreenManager(ScreenManager):
pass
# Branch Screen, takes you to S1, S2, or S3
class BRANCH(Screen):
pass
class S1(Screen):
pass
class S2(Screen):
pass
class S3(Screen):
pass
class FINAL_SCREEN(Screen):
previous = StringProperty()
class MAINApp(App):
def build(self):
return Builder.load_string(kv_str)
if __name__ == '__main__':
MAINApp().run()
我按照評論中的建議嘗試了previous()
<FINAL_SCREEN>:
FloatLayout:
Label:
pos_hint: {'x': 0.00, 'y': 0.20}
font_size: 35
text: 'Final Screen'
color: 1, 1, 1, 1
Button:
text: 'Back'
color: 1.0, 0.6, 0.0, 1
font_size: 20
size_hint_x: 0.20
size_hint_y: 0.20
pos_hint: {'x': 0.40, 'y': 0.15}
on_release:
print(root.manager.previous())
root.manager.current = root.manager.previous()
奇怪的是,它將始終返回screen3,因此我使用了上面的版本。
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