Question

我正在尝试制作简单的聊天流媒体。我正在努力的是让聊天消息左对齐，并根据窗口大小动态包装文本。

我们的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大小中的text_size设置。如果您在kv中也设置了halign，则可以完全删除__init__。

滚动小部件中的Kivy Label文本换行

1 个答案: