python - Kivy 标签文本在滚动小部件中换行

Question

我正在尝试制作一个简单的聊天流媒体。我正在努力解决的是让聊天消息左对齐并根据窗口大小动态换行文本。

这个想法是将聊天消息显示为网格布局中的标签。

class ChatMessage(Label):

    def __init__(self, *args, **kwargs):
        super(ChatMessage, self).__init__(*args, **kwargs)
        self.text_size = self.size
        self.halign = 'left'

class Root(ScreenManager):

    def __init__(self, *args, **kwargs):
        super(ScreenManager, self).__init__(*args, **kwargs)
        self.ids.chatstream.bind(minimum_height=self.ids.chatstream.setter('height'))
        self.add_message()


    def add_message(self):
        for x in xrange(50):
            label = ChatMessage(text='Im still not completely sure I understand the mechanisms at work here, though.. Im still not completely sure I understand the mechanisms at work here, though.. Im still not completely sure I understand the mechanisms at work here, though.' + str(x))

            self.ids.chatstream.add_widget(label)
            self.ids.scroller.scroll_y = 0

kv 文件:

<Root>:
    Screen:
        name: 'main'
        BoxLayout:
            orientation: 'vertical'
            Button:
                text: ''
                on_release: app.root.current = 'chat'

    Screen:
        name: 'chat'
        BoxLayout:
            orientation: 'vertical'
            ScrollView:
                id: scroller
                do_scroll_x: False
                GridLayout:
                    id: chatstream
                    cols: 1
                    padding: (10, 15)
                    spacing: 20
                    size_hint_y: None
            Button:
                text: ''
                on_release: app.root.current = 'main' 

Answer 1

设置 ChatMessage 实例的大小，例如

<ChatMessage>
    size_hint_y: None
    height: self.texture_size[1]  # the size needed to fit the text
    text_size: self.width, None

同时删除python size中的text_size设置。如果您也在 kv 中设置了 halign，则可以完全删除 __init__。