Python / Kivy：如何在ctrl +键盘事件上调用函数

Question

我正在使用python-2.7和kivy-1.9.0。当我运行test.py时，会显示Menu1，Menu2菜单。
当我点击Menu1然后显示+Add Menu1文字。当我点击+Add Menu1然后调用函数root.add_menu1()。如何使用ctrl+a键盘键事件而不是鼠标点击它？ 如果我点击Menu2然后显示+Add Menu2文字，则相同。之后按ctrl+a键，然后应调用root.add_menu2()功能。

test.py

import kivy

kivy.require('1.9.0')
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import BooleanProperty, ListProperty, ObjectProperty,NumericProperty
from kivy.uix.dropdown import DropDown
from kivy.core.window import Window
Window.maximize()


class MENU1(BoxLayout):

    def add_menu1(self):
        pass


class MENU2(BoxLayout):

    def add_menu2(self):
        pass

class MainMenu(BoxLayout):
    test1_or_test2 = ObjectProperty()
    def display_menu1(self):
        self.remove_widgets()
        self.menu1 = MENU1()
        self.test1_or_test2.add_widget(self.menu1)

    def display_menu2(self):
        self.remove_widgets()
        self.menu2 = MENU2()
        self.test1_or_test2.add_widget(self.menu2)

    def remove_widgets(self):
        self.test1_or_test2.clear_widgets()

class Test(App):
    title = "test"

    def build(self):
        return MainMenu()



if __name__ == '__main__':
    Test().run()

test.kv

<MENU1>:
    BoxLayout:
        orientation: "vertical"

        Button:
            size_hint: .06, .03
            text: "+Add Menu1"
            on_press: root.add_menu1()


        GridLayout:
            size_hint: 1, None
            size_hint_y:None
            height: 25
            cols: 5

        BoxLayout:
            Label:
                text:""

<MENU2>:
    BoxLayout:
        orientation: "vertical"

        Button:
            size_hint: .06, .03
            text: "+Add Menu2"
            on_press: root.add_menu2()


        GridLayout:
            size_hint: 1, None
            size_hint_y:None
            height: 25
            cols: 5

        BoxLayout:
            Label:
                text:""

<MenuButton@Button>:
    text_size: self.size
    valign: "middle"
    padding_x: 5
    size : (80,30)
    size_hint : (None, None)
    background_color: 90 , 90, 90, 90
    background_normal: ''
    color: 0, 0.517, 0.705, 1
    border: (0, 10, 0, 0)


<MainMenu>:
    test1_or_test2: test1_or_test2

    BoxLayout:
        orientation: 'vertical'

        BoxLayout:
            canvas.before:
                Rectangle:
                    pos: self.pos
                    size: self.size

            size_hint_y: 1

            MenuButton:
                id: btn
                text: 'Menu1'
                size : (60,30)
                on_release: root.display_menu1()

            MenuButton:
                id: btn
                text: 'Menu2'
                size : (60,30)
                on_release: root.display_menu2()



        BoxLayout:
            canvas.before:
                Rectangle:
                    pos: self.pos
                    size: self.size

                Color:
                    rgb: (1,1,1)

            Label:
                size_hint_x: 45

        BoxLayout:
            id: test1_or_test2
            size_hint_y: 10

        Label:
            size_hint_y: 1

Answer 1

1. 将 display_menu1 和 display_menu2 两种方法合并到一个常用方法 display_menu 。
2. 将 add_menu1 和 add_menu2 两种方法重命名为 add_menu 。
3. 添加了新的 ObjectProperty ，菜单以连接 Menu1 或 Menu2 。
4. 使用键向下绑定，检查 ctrl + a 以调用 add_menu 。

实施例

main.py

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import BooleanProperty, ListProperty, ObjectProperty, NumericProperty, StringProperty
from kivy.uix.dropdown import DropDown
from kivy.core.window import Window
Window.maximize()


class MENU1(BoxLayout):

    def add_menu(self):
        print("MENU1.add_menu")


class MENU2(BoxLayout):

    def add_menu(self):
        print("MENU2.add_menu")


class MainMenu(BoxLayout):
    test1_or_test2 = ObjectProperty(None)
    menu = ObjectProperty(None)

    def __init__(self, **kwargs):
        super(MainMenu, self).__init__(**kwargs)
        Window.bind(on_key_down=self._on_keyboard_down)

    def _on_keyboard_down(self, instance, keyboard, keycode, text, modifiers):
        if len(modifiers) > 0 and modifiers[0] == 'ctrl' and text == 'a':  # Ctrl+a
            print("\nThe key", keycode, "have been pressed")
            print(" - text is %r" % text)
            print(" - modifiers are %r" % modifiers)
            self.menu.add_menu()

    def display_menu(self, instance):
        self.remove_widgets()
        if instance.text == 'Menu1':
            self.menu = MENU1()
        elif instance.text == 'Menu2':
            self.menu = MENU2()
        self.test1_or_test2.add_widget(self.menu)

    def remove_widgets(self):
        self.test1_or_test2.clear_widgets()


class Test(App):
    title = "test"

    def build(self):
        return MainMenu()


if __name__ == '__main__':
    Test().run()

test.kv

#:kivy 1.10.0

<MENU1>:
    BoxLayout:
        orientation: "vertical"

        Button:
            size_hint: .06, .03
            text: "+Add Menu1"
            on_press: root.add_menu()


        GridLayout:
            size_hint: 1, None
            size_hint_y:None
            height: 25
            cols: 5

        BoxLayout:
            Label:
                text:""

<MENU2>:
    BoxLayout:
        orientation: "vertical"

        Button:
            size_hint: .06, .03
            text: "+Add Menu2"
            on_press: root.add_menu()


        GridLayout:
            size_hint: 1, None
            size_hint_y:None
            height: 25
            cols: 5

        BoxLayout:
            Label:
                text:""

<MenuButton@Button>:
    text_size: self.size
    valign: "middle"
    padding_x: 5
    size : (80,30)
    size_hint : (None, None)
    background_color: 90 , 90, 90, 90
    background_normal: ''
    color: 0, 0.517, 0.705, 1
    border: (0, 10, 0, 0)


<MainMenu>:
    test1_or_test2: test1_or_test2

    BoxLayout:
        orientation: 'vertical'

        BoxLayout:
            canvas.before:
                Rectangle:
                    pos: self.pos
                    size: self.size

            size_hint_y: 1

            MenuButton:
                id: btn
                text: 'Menu1'
                size : (60,30)
                on_release: root.display_menu(self)

            MenuButton:
                id: btn
                text: 'Menu2'
                size : (60,30)
                on_release: root.display_menu(self)

        BoxLayout:
            canvas.before:
                Rectangle:
                    pos: self.pos
                    size: self.size

                Color:
                    rgb: (1,1,1)

            Label:
                size_hint_x: 45

        BoxLayout:
            id: test1_or_test2
            size_hint_y: 10

        Label:
            size_hint_y: 1

输出