Question

我很难弄清楚如何使用ModalView小部件内按钮的on_press属性来正确更改屏幕。

按下ModalView中的按钮，我希望屏幕更改为Game1HomeScreen类和其他GameHomeScreen类中定义的game_screen_name（如下面的NewGameButton和SavedGameButton所做）。这个应用程序有多个游戏，所以我宁愿不直接调用Game1HomeScreen1（）。game_screen_name，而是希望保持通用，所以game_screen_name采用从中调用NewGamePopup的类的值。

这样做的好方法是什么？

main.py代码：

class Game1HomeScreen(Screen):
    game_screen_name = 'game1_gameboard_screen_name'


class NewGamePopup(ModalView):
    pass


class GamesApp(App):

    sm = ScreenManager()

    def show_new_game_popup(self):
        p = NewGamePopup()
        p.open()

    def prev_screen(self):
        self.sm.current = self.game_screen_name #this line does not work of course, because there is no game_screen_name variable in the NewGamePopup class.

.kv代码：

<NewGamePopup>:
    size_hint: .5, .3
    NewGameBoxLayout:
        padding: [10,10,10,10]
        orientation: 'vertical'
        Label:
            font_name: 'fonts/playce.ttf'
            font_size: '14sp'
            markup: True
            text: '[color=#000000]Are you sure? Current game will be erased![/color]'
        Button:
            font_name: 'fonts/playce.ttf'
            font_size: '14sp'
            text: 'Confirm'
            background_normal: 'img/red_button5.png'
            background_down: 'img/red_button5.png'
            size_hint_y: None
            on_press: root.dismiss(); app.prev_screen()

<Game1HomeScreen>:
    GeneralBoxLayout:
        BannerGridLayout1:
        BodyBoxLayout:
            rows: 2
            Image:
                source: 'img/logo.png'
                size_hint: (1.0,.9)
            GridLayout:
                cols: 2
                spacing: '5dp'
                padding: '5dp'
                size_hint: (1.0,.1)
                NewGameButton:
                    id: game1
                    on_press:
                        if saved_game1.disabled == False: app.show_new_game_popup()
                        else: root.manager.current = root.game_screen_name; saved_game1.disabled = False
                SavedGameButton:
                    id: saved_game1
                    on_press: root.manager.current = root.game_screen_name;
        FooterGridLayout:
            ReturnButton:
                text: 'Return to main menu'
                on_press: root.manager.current = 'home'

Answer 1

在选择游戏时将游戏画面名称保存在字符串属性中

from kivy.properties import StringProperty

....

class GamesApp(App):
    game_screen_name = StringProperty('')

然后您可以根据需要稍后使用sm.current调用。在问题的代码片段中遗漏了太多东西来创建一个工作版本;甚至没有构建方法。

Kivy - 在ModalView中按下按钮后更改屏幕

1 个答案: