标签保持从ScrollView屏幕x轴Kivy的边缘离开 [英] Label keeps running off edge of ScrollView screen x axis Kivy

问题描述

我正在创建一个聊天屏幕，每次按下发送按钮时，都会在我的GridLayout中添加一个Label.但是，当文本变得太长时，我的Labels会从屏幕的一侧移开，我希望它们绕行并将文本移到新的一行，但这没有发生，我不确定为什么.

I'm creating a chat screen, adding a Label to my GridLayout everytime the send button is pressed. However, my Labels run off the side of the screen when the text becomes too long, I would like them to wrap round and the text to go onto a new line but this isn't happening and I'm not sure why.

<ChatPage>:
    name: "chat_page"
    layout_content: layout_content

    NavigationLayout:
        id: nav_layout
        MDNavigationDrawer:
            NavigationDrawerIconButton:
                text: "Test"
                on_release: app.root.current = "login"

        FloatLayout:
            MDToolbar:
                pos_hint: {'top': 1}
                md_bg_color: 0.2, 0.6, 1, 1
                left_action_items: [['menu', lambda x: root.ids.nav_layout.toggle_nav_drawer()]]

            ScrollView:
                size_hint: 0.95, 0.6
                pos_hint: {"x": 0.025, "top" : 0.8, "bottom" : 0.5}
                do_scroll_x: False
                GridLayout:
                    id: layout_content
                    cols: 2
                    size_hint_y: None
                    spacing: 10
                    height: self.minimum_height
                    canvas:
                        Color:
                            rgba: (1, 1, 1, 1)
                        Rectangle:
                            size: self.size
                            pos: self.pos

            BoxLayout:
                TextInput:
                    id: msg
                    hint_text: "Type your message here"
                    pos_hint: {"x": 0, "top": 0.15}
                    size_hint: 0.75, 0.15
                Button:
                    text: "Send"
                    background_normal: ""
                    background_color: 0, 0.6, 0, 1
                    pos_hint: {"x": 0.75, "top": 0.15}
                    size_hint: 0.25, 0.15
                    on_release: root.btn_press()

<SmoothLabel>:
    size_hint: None, None
    size: self.texture_size
    padding: 10, 10
    multiline: True
    background_color: 0,0,0,0
    background_normal: ""
    back_color: 1,0,1,1
    border_radius: [6]
    canvas.before:
        Color:
            rgba: 0.2,0.6,1,1 #This changes the label colour
        RoundedRectangle:
            size: self.size
            pos: self.pos
            radius: self.border_radius

py文件

import kivy
from kivy.app import App
from kivy.properties import ObjectProperty, StringProperty, NumericProperty, ListProperty
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.uix.popup import Popup
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.core.window import Window
from kivymd.theming import ThemeManager
import mysql.connector
from kivymd.uix.picker import MDDatePicker
from kivy.uix.scrollview import ScrollView

Window.clearcolor = (1,1,1,1)


class SmoothLabel(Label):
    pass


class ChatPage(Screen):
    layout_content = ObjectProperty(None)
    def btn_press(self):
        if self.ids.msg.text:
            lab1 = Label()
            self.layout_content.add_widget(SmoothLabel(text=self.ids.msg.text))
            self.layout_content.add_widget(lab1)
            self.ids.msg.text = ""
        else:
            pass


class WindowManager(ScreenManager):
    pass


class MyApp(App):
    theme_cls = ThemeManager()

    def build(self):
        kv = Builder.load_file("kivy.kv")
        sm = WindowManager()

        screens = [ChatPage(name="chat_page")]
        for screen in screens:
            sm.add_widget(screen)

        sm.current = "chat_page"
        return sm


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

推荐答案

我应该坚持要求您将新问题作为单独的帖子提交.但这是解决您两个问题的另一个答案:

I should insist that you submit your new question as a separate post. But here is another answer that handles both your questions:

使用text_size的概念以及使用kivy.core.text.Label计算SmoothLabel大小，可以创建调整后的SmoothLabel大小.

Using the concept of the text_size along with calculating the SmoothLabel size with kivy.core.text.Label, a size adjusted SmoothLabel can be created.

向SmoothLabel添加静态方法:

class SmoothLabel(Label):
    @staticmethod
    def create_sized_label(**kwargs):
        max_width = kwargs.pop('max_width', 0)
        if max_width <= 0:
            # just create a SmoothLabel without a text_size
            return SmoothLabel(**kwargs)

        # calculate what the SmoothLabel size will be
        core_label = CoreLabel(padding=[10,10], **kwargs)  # use same padding as SmoothLabel
        core_label.refresh()

        if core_label.width > max_width:
            # width is too big, use text_size to force wrapping
            return SmoothLabel(text_size=(max_width,None), **kwargs)
        else:
            # width is OK, no need for text_size
            return SmoothLabel(**kwargs)

然后在ChatPage中使用该方法:

class ChatPage(Screen):
    layout_content = ObjectProperty(None)
    def btn_press(self):
        if self.ids.msg.text:
            lab1 = Label()

            # calculate max allowable width in the GridLayout
            max_width = self.layout_content.width - self.layout_content.spacing[0] - self.layout_content.padding[0] - self.layout_content.padding[2]

            # specify font and font_size (so that the CoreLabel uses the same)
            self.layout_content.add_widget(SmoothLabel.create_sized_label(text=self.ids.msg.text, max_width=max_width, font_name='Roboto', font_size=15))

            self.layout_content.add_widget(lab1)
            self.ids.msg.text = ""
        else:
            pass

这篇关于标签保持从ScrollView屏幕x轴Kivy的边缘离开的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！