使用 Kivy,如何让复选框的活动(或非活动)状态在第二个屏幕上旋转(或不旋转)图像?
Using Kivy, how do I have a checkbox's active (or inactive) status rotate (or not rotate) an image on the second screen?
在第一个屏幕上,我有一个复选框,询问用户是否希望他们的图像处于横向模式。在第二个屏幕上,我的代码当前使用 canvas
并将图像旋转 90 度。如果未选中该框,则表示用户希望图像为纵向模式,我需要清除 canvas。
my.kv
WindowManager:
MainWindow:
SecondWindow:
<MainWindow>:
id: main_window
name: "main"
BoxLayout:
orientation: "vertical"
size: root.width, root.height
padding: 50
Label:
text: "Email"
color: 0,0,0,1
font_size: 32
BoxLayout:
orientation: "horizontal"
Label:
text: "Email Address:"
color: 0,0,0,1
TextInput:
size_hint_y: None
pos_hint: {'center_y': .5}
height: 38
multiline: True
padding: 10
BoxLayout:
orientation: "horizontal"
Label:
text: "Display Landscape Mode?"
color: 0,0,0,1
CheckBox:
id: checkbox_confirm_mode
on_active:
root.checkbox_click_mode(self, self.active)
pos_hint: {'center_x': .5}
BoxLayout:
orientation: "horizontal"
Label:
text: "Stretch image to fill screen?"
color: 0,0,0,1
CheckBox:
id: checkbox_confirm_stretch
on_active:
root.checkbox_click_stretch(self, self.active)
pos_hint: {'center_x': .5}
BoxLayout:
orientation: "horizontal"
Label:
text: "I double-checked that my email is typed correctly:"
color: 0,0,0,1
CheckBox:
id: checkbox_confirm_email
on_active:
root.checkbox_click(self, self.active)
root.disable_button()
pos_hint: {'center_x': .5}
BoxLayout
orientation: "vertical"
Button:
id:submit_button
text: "Submit"
disabled: True
size_hint: (0.2, None)
pos_hint: {'center_x': .5}
height: 50
on_release:
app.root.current = "second"
root.manager.transition.direction = "left"
<SecondWindow>:
id: second_window
name: "second"
canvas:
Rotate:
angle: 90
origin: self.center
Image:
source: 'Troy.png'
keep_ratio: True
allow_stretch: False
main.py
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.core.window import Window
from kivy.properties import ObjectProperty
from kivy.config import Config
Config.set('input', 'mouse', 'mouse,multitouch_on_demand')
class MainWindow(Screen):
def on_pre_enter(self):
Window.size = (750,400)
Window.clearcolor = (1, 1, 1, 1)
def checkbox_click(self, instance, value):
return value
def checkbox_click_mode(self, instance, value):
return value
def checkbox_click_stretch(self, instance, value):
return value
def clear_canvas(self):
self.canvas.clear()
return
def disable_button(self):
if self.ids.checkbox_confirm_email.active == False:
self.ids.submit_button.disabled = True
else:
self.ids.submit_button.disabled = False
class SecondWindow(Screen):
def on_pre_enter(self):
Window.size = (500,500)
Window.clearcolor = (0,0,0,0)
pass
class WindowManager(ScreenManager):
pass
class MyMainApp(App):
def build(self):
return kv
kv = Builder.load_file("my.kv")
if __name__ == "__main__":
MyMainApp().run()
对于您当前的设计,您可以从外部控制它,
- 首先在
SecondWindow
中设置属性,用于设置角度、拉伸指令等,然后根据这些的状态(复选框的弱引用)checkbox_confirm_mode
等来控制它们MainWindow
作为,
class SecondWindow(Screen):
angle = NumericProperty(0)
allow_strech = BooleanProperty(False)
def on_pre_enter(self):
screen = self.manager.get_screen("main")
angle_value = screen.ids.checkbox_confirm_mode.active
stretch_value = screen.ids.checkbox_confirm_stretch.active
self.angle = 90*angle_value # Less calculation.
self.allow_strech = stretch_value # Less calculation.
Window.size = (500,500)
...
- 现在在
SecondWindow
的 kvlang
,
<SecondWindow>:
id: second_window
name: "second"
canvas:
Rotate:
angle: root.angle
origin: self.center
Image:
source: 'Troy.png'
keep_ratio: True
allow_stretch: root.allow_strech
在第一个屏幕上,我有一个复选框,询问用户是否希望他们的图像处于横向模式。在第二个屏幕上,我的代码当前使用 canvas
并将图像旋转 90 度。如果未选中该框,则表示用户希望图像为纵向模式,我需要清除 canvas。
my.kv
WindowManager:
MainWindow:
SecondWindow:
<MainWindow>:
id: main_window
name: "main"
BoxLayout:
orientation: "vertical"
size: root.width, root.height
padding: 50
Label:
text: "Email"
color: 0,0,0,1
font_size: 32
BoxLayout:
orientation: "horizontal"
Label:
text: "Email Address:"
color: 0,0,0,1
TextInput:
size_hint_y: None
pos_hint: {'center_y': .5}
height: 38
multiline: True
padding: 10
BoxLayout:
orientation: "horizontal"
Label:
text: "Display Landscape Mode?"
color: 0,0,0,1
CheckBox:
id: checkbox_confirm_mode
on_active:
root.checkbox_click_mode(self, self.active)
pos_hint: {'center_x': .5}
BoxLayout:
orientation: "horizontal"
Label:
text: "Stretch image to fill screen?"
color: 0,0,0,1
CheckBox:
id: checkbox_confirm_stretch
on_active:
root.checkbox_click_stretch(self, self.active)
pos_hint: {'center_x': .5}
BoxLayout:
orientation: "horizontal"
Label:
text: "I double-checked that my email is typed correctly:"
color: 0,0,0,1
CheckBox:
id: checkbox_confirm_email
on_active:
root.checkbox_click(self, self.active)
root.disable_button()
pos_hint: {'center_x': .5}
BoxLayout
orientation: "vertical"
Button:
id:submit_button
text: "Submit"
disabled: True
size_hint: (0.2, None)
pos_hint: {'center_x': .5}
height: 50
on_release:
app.root.current = "second"
root.manager.transition.direction = "left"
<SecondWindow>:
id: second_window
name: "second"
canvas:
Rotate:
angle: 90
origin: self.center
Image:
source: 'Troy.png'
keep_ratio: True
allow_stretch: False
main.py
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.core.window import Window
from kivy.properties import ObjectProperty
from kivy.config import Config
Config.set('input', 'mouse', 'mouse,multitouch_on_demand')
class MainWindow(Screen):
def on_pre_enter(self):
Window.size = (750,400)
Window.clearcolor = (1, 1, 1, 1)
def checkbox_click(self, instance, value):
return value
def checkbox_click_mode(self, instance, value):
return value
def checkbox_click_stretch(self, instance, value):
return value
def clear_canvas(self):
self.canvas.clear()
return
def disable_button(self):
if self.ids.checkbox_confirm_email.active == False:
self.ids.submit_button.disabled = True
else:
self.ids.submit_button.disabled = False
class SecondWindow(Screen):
def on_pre_enter(self):
Window.size = (500,500)
Window.clearcolor = (0,0,0,0)
pass
class WindowManager(ScreenManager):
pass
class MyMainApp(App):
def build(self):
return kv
kv = Builder.load_file("my.kv")
if __name__ == "__main__":
MyMainApp().run()
对于您当前的设计,您可以从外部控制它,
- 首先在
SecondWindow
中设置属性,用于设置角度、拉伸指令等,然后根据这些的状态(复选框的弱引用)checkbox_confirm_mode
等来控制它们MainWindow
作为,
class SecondWindow(Screen):
angle = NumericProperty(0)
allow_strech = BooleanProperty(False)
def on_pre_enter(self):
screen = self.manager.get_screen("main")
angle_value = screen.ids.checkbox_confirm_mode.active
stretch_value = screen.ids.checkbox_confirm_stretch.active
self.angle = 90*angle_value # Less calculation.
self.allow_strech = stretch_value # Less calculation.
Window.size = (500,500)
...
- 现在在
SecondWindow
的kvlang
,
<SecondWindow>:
id: second_window
name: "second"
canvas:
Rotate:
angle: root.angle
origin: self.center
Image:
source: 'Troy.png'
keep_ratio: True
allow_stretch: root.allow_strech