如何在用 kivy 按下按钮时更改 space？

Question

我正在尝试通过实现 ComicCreator GUI sample as a template for my own project. The code 的模板来创建一个 GUI 很容易理解，但我希望能够在每次按下按钮时重新配置 drawingspace.kv，例如这样说：

问：我如何配置 drawingspace.kv 以针对按下的每个按钮设置不同的布局和不同的小部件？

Answer 1

布局框架应该是a screen manager, and each layout a screen. Screen transitions would be then triggered by pressing the buttons. You can also watch a tutorial here如果你不知道怎么做，但是文档应该足够了。

Answer 2

一个巧妙的方法是使用屏幕。

因为我已经从你之前的问题中得到了这个应用程序的示例，所以很容易实现屏幕，并稍微重写类。

按下按钮时，您可以将屏幕管理器的电流设置为您为屏幕命名的任何名称。

然后您只需在每个屏幕内、kv 文件或 python 文件中根据需要编辑布局。

我选择在这里用 kv 语言制作大部分布局内容。因为我发现以这种方式开发布局更容易。如果需要，我可以稍后将其重写为 python。

所以我的 python 文件现在看起来像这样：

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty
from kivy.clock import Clock
from kivy.uix.screenmanager import Screen,ScreenManager,NoTransition
from kivy.lang import Builder
import time


Builder.load_file("kv.kv")


class MyLayout(BoxLayout):

    def __init__(self,**kwargs):
        super(MyLayout,self).__init__(**kwargs)
        self.orientation = "vertical"
        self.padding = 10


class MainScreen(Screen):
    pass


class RemoveScreen(Screen):
    pass


class GroupScreen(Screen):
    pass


class MyLogo(BoxLayout):

    your_time = StringProperty()
    def __init__(self,**kwargs):
        super(MyLogo,self).__init__(**kwargs)
        Clock.schedule_interval(self.set_time, 0.1)

    def set_time(self,dt):
        self.your_time = time.strftime("%m/%d/%Y %H:%M")




class MyApp(App):
    def __init__(self,**kwargs):
        super(MyApp,self).__init__(**kwargs)
        self.sm = ScreenManager(transition=NoTransition())

        self.sm.add_widget(MainScreen(name = "main"))
        self.sm.add_widget(RemoveScreen(name = "remove"))
        self.sm.add_widget(GroupScreen(name = "group"))

        self.sm.current = "main"

    def build(self):
        return self.sm


if __name__ == "__main__":
    MyApp().run()

并且 kv.kv 文件如下所示：

#:kivy 1.9.1

<MyButtons@BoxLayout>:
    padding: 10,10,10,0
    spacing: 10
    size_hint: 1,0.3
    orientation: "horizontal"
    Button:
        text: "Clear"
        on_press: app.sm.current = "main"
    Button:
        text: "Remove"
        on_press: app.sm.current = "remove"
    Button:
        text: "Group"
        on_press: app.sm.current = "group"
    Button:
        text: "Color"
    Button:
        text: "Gestures"

<MyLogo>:
    spacing: 10
    padding: 10,10,10,0
    orientation: "horizontal"
    BoxLayout:
        orientation: "vertical"
        size_hint: 0.3,1
        canvas:
            Rectangle:
                pos: self.pos
                size: self.size
        AsyncImage
            source: 'http://lmsotfy.com/so.png'
        Label:
            size_hint: 1,0.3
            text: root.your_time
            color: [0,0,0,1]
        Label:
            size_hint: 1,0.3
            text: "NYC, New York, USA"
            color: [0,0,0,1]


<MainScreen>:
    MyLayout:
        MyLogo:
            #Button:
            #    text: "main"

        MyButtons:
            #buttons

        BoxLayout:
            padding: 10,10,10,10
            size_hint: 1,0.3
            Button:
                text: "Total figures: 1          Kivy Started"


<RemoveScreen>:
    MyLayout:
        MyLogo:
            BoxLayout:
                orientation: "horizontal"
                Label:
                    font_size: "40sp"
                    text: "Remove"
                Button:
                    font_size: "20sp"
                    text: "Remove this or something"

        MyButtons:
            #buttons

        BoxLayout:
            padding: 10,10,10,10
            size_hint: 1,0.3
            Button:
                text: "Total figures: 1          Kivy Started"


<GroupScreen>:
    MyLayout:
        MyLogo:
            BoxLayout:
                orientation: "vertical"
                Label:
                    font_size: "40sp"
                    text: "Group"
                Button:
                    font_size: "20sp"
                    text: "Something groups stuff"

        MyButtons:
            #buttons

        BoxLayout:
            padding: 10,10,10,10
            size_hint: 1,0.3
            Button:
                text: "Total figures: 1          Kivy Started"

如何在用 kivy 按下按钮时更改 space？

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