[英]Using Kivy, how do I have a checkbox's active (or inactive) status rotate (or not rotate) an image on the second screen?
On the first screen, I have a checkbox that asks the user if they want their image in landscape mode.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。 On the second screen, my code currently uses a canvas
and rotates the image 90 degrees.在第二个屏幕上,我的代码当前使用canvas
并将图像旋转 90 度。 If that box is not checked, that means the user wants the image to be portrait mode, and I need that canvas to be cleared.如果未选中该框,则意味着用户希望图像为纵向模式,我需要清除 canvas。
my.kv我的.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主程序
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()
For your current design you can control it from outside as,对于您当前的设计,您可以从外部控制它,因为,
SecondWindow
for setting the angle, stretch instruction etc. and then control them depending on the state of those (weak reference of the check boxes) checkbox_confirm_mode
etc. from the MainWindow
as,首先在SecondWindow
中设置属性以设置角度、拉伸指令等,然后根据MainWindow
中的 state(复选框的弱引用) checkbox_confirm_mode
等来控制它们,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)
...
kvlang
of SecondWindow
,现在在kvlang
的SecondWindow
中,<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
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