Python Kivy 在 Popup 中的按钮之间切换

Question

我想在这里请求 python kivy 桌面应用程序的帮助，我有一个小问题，但它很烦人。我遇到的问题是在带有键盘 "Tab key" 的 kivy 弹出窗口中的两个按钮（是按钮和否按钮）之间切换不起作用，我还希望能够按下 "Enter key" 来处理所选按钮的功能.

我的弹出窗口如下所示：

Popup screenshot

弹窗代码如下：

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.popup import Popup
from kivy.uix.label import Label


class testWindow(BoxLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

        def yes_btn(instance):
            print("this function is called.")

        contents = BoxLayout(orientation='vertical')
        content_text = Label(text="Lanjutkan Transaksi?")
        pop_btn = BoxLayout(spacing=10)
        btn_yes = Button(text='Ya', size_hint_y=None, height=40)
        btn_no = Button(text='Tidak', size_hint_y=None, height=40)
        pop_btn.add_widget(btn_yes)
        pop_btn.add_widget(btn_no)
        contents.add_widget(content_text)
        contents.add_widget(pop_btn)

        pop_insert = Popup(title="Confirmation Message", content=contents, size_hint=(None, None), size=(300, 300))

        btn_yes.bind(on_release=yes_btn)
        btn_no.bind(on_release=pop_insert.dismiss)

        pop_insert.open()


class testApp(App):
    def build(self):
        return testWindow()


if __name__ == '__main__':
    m = testApp()
    m.run()

当我使用鼠标单击按钮时，弹出窗口正常运行。如上面的弹出图片，我想让 Yes Button 成为焦点，当我按下 "Enter key" 弹出窗口关闭和运行我想要的功能时。同时要在按钮之间切换，只需按 "Tab key".

我一直在寻找解决问题的方法，但仍然没有结果，所以请知道如何解决我的问题的人帮助我。

Answer 1

这是我认为可以满足您要求的对代码的修改：

from kivy.app import App
from kivy.core.window import Window
from kivy.lang import Builder
from kivy.properties import BooleanProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.popup import Popup
from kivy.uix.label import Label
from kivy.uix.behaviors import FocusBehavior

# This is a Button that also has focus behavior
class FocusButton(FocusBehavior, Button):
    first_focus = BooleanProperty(False)

    def on_parent(self, widget, parent):
        # if first_focus is set, this Button takes the focus first
        if self.first_focus:
            self.focus = True


class MyPopup(Popup):
    def keydown(self, window, scancode, what, text, modifiers):
        if scancode == 13:
            for w in self.walk():
                if isinstance(w, FocusButton) and w.focus:
                    w.dispatch('on_press')

    def keyup(self, key, scancode, codepoint):
        if scancode == 13:
            for w in self.walk():
                if isinstance(w, FocusButton) and w.focus:
                    w.dispatch('on_release')

    def on_dismiss(self):
        Window.unbind(on_key_down=self.keydown)
        Window.unbind(on_key_up=self.keyup)

Builder.load_string('''
# provide for a small border that indicates Focus
<FocusButton>:
    canvas.before:
        Color:
            rgba: 1,1,1,1
        Rectangle:
            pos: self.x-2, self.y-2
            size: (self.size[0]+4, self.size[1]+4) if self.focus else (0,0)
''')


class testWindow(BoxLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

        def yes_btn(instance):
            print("this function is called.")

        contents = BoxLayout(orientation='vertical')
        content_text = Label(text="Lanjutkan Transaksi?")
        pop_btn = BoxLayout(spacing=10)

        # set first_focus to True for this Button
        self.btn_yes = FocusButton(text='Ya', size_hint_y=None, height=40, first_focus=True)
        self.btn_no = FocusButton(text='Tidak', size_hint_y=None, height=40)
        pop_btn.add_widget(self.btn_yes)
        pop_btn.add_widget(self.btn_no)
        contents.add_widget(content_text)
        contents.add_widget(pop_btn)

        pop_insert = MyPopup(title="Confirmation Message", content=contents, size_hint=(None, None), size=(300, 300))

        self.btn_yes.bind(on_release=yes_btn)
        self.btn_no.bind(on_release=pop_insert.dismiss)

        # bind to get key down and up events
        Window.bind(on_key_down=pop_insert.keydown)
        Window.bind(on_key_up=pop_insert.keyup)

        pop_insert.open()

class testApp(App):
    def build(self):
        return testWindow()


if __name__ == '__main__':
    m = testApp()
    m.run()

此代码将 FocusBehavior 添加到 Button 以创建 FocusButton，并将按键按下和按键向上处理添加到 MyPopup class。

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