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python - 在 TextInput 中禁用文本换行

问题描述

有没有办法在 TextInput 小部件中禁用文本换行？也就是说，我仍然希望有换行符，但我不想在段落中换行。所以这似乎multiline=False不是我要找的

更新：我的意思是 Windows（例如 Windows 7）Microsoft 记事本（格式 - 自动换行）中有“自动换行”选项。我想在 kivy TextInput 中禁用此选项

标签： pythonkivy

解决方案

我不做 Windows，但这对我来说听起来像是水平滚动。TextInput如果您设置为 False，则默认情况下会进行水平滚动，multiline但当设置multiline为 True 时则不会。所以这里有一个技巧，可以TextInput在 a为 TrueScrollView时提供水平滚动：multiline

from kivy.app import App
from kivy.lang import Builder
from kivy.properties import NumericProperty
from kivy.uix.scrollview import ScrollView
from kivy.uix.textinput import TextInput


class MyTextInput(TextInput):
    minimum_width = NumericProperty(1)

    def on_cursor(self, instance, newPos):
        # determine scroll position of parent ScrollView if multiline is True
        if not (isinstance(self.parent, ScrollView) and self.multiline):
            return super(MyTextInput, self).on_cursor(instance, newPos)
        if newPos[0] == 0:
            self.parent.scroll_x = 0
        else:
            over_width = self.width - self.parent.width
            if over_width <= 0.0:
                return super(MyTextInput, self).on_cursor(instance, newPos)
            view_start = over_width * self.parent.scroll_x
            view_end = view_start + self.parent.width
            offset = self.cursor_offset()
            desired_view_start = offset - 5
            desired_view_end = offset + self.padding[0] + self.padding[2] + self.cursor_width + 5
            if desired_view_start < view_start:
                self.parent.scroll_x = max(0, desired_view_start / over_width)
            elif desired_view_end > view_end:
                self.parent.scroll_x = min(1, (desired_view_end - self.parent.width) / over_width)
        return super(MyTextInput, self).on_cursor(instance, newPos)

    def on_text(self, instance, newText):
        # calculate minimum width
        width_calc = 0
        for line_label in self._lines_labels:
            width_calc = max(width_calc, line_label.width + 20)   # add 20 to avoid automatically creating a new line
        self.minimum_width = width_calc


theRoot = Builder.load_string('''
ScrollView:
    id: scroller
    effect_cls: 'ScrollEffect'  # keeps from scrolling to far
    MyTextInput:
        size_hint: (None, 1)
        width: max(self.minimum_width, scroller.width)
''')

class TI_in_SV(App):
    def build(self):
        return theRoot

TI_in_SV().run()

请注意，MyTextInput扩展TextInput.

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