如何在文本框中选择文本

Question

我正在使用python-2.7 和kivy。有人帮助我，当我点击TextBox 时，如何使用python 或kivy 代码选择文本？

test.py

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.core.window import Window
Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (400, 50)

class abc(BoxLayout):
    pass

class Test(App):
    def build(self):
        return abc()


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

test.kv

<abc>:
    BoxLayout:
        orientation: "vertical"
        size_hint_y: .5

        BoxLayout:
            orientation: "horizontal"
            spacing: 10, 10
            size_hint_x: .6

            Label:
                text: "TEXT"
                text_size: self.size
                valign: 'middle'
                size_hint_x: .2

            TextInput:
                size_hint_x: .4

Answer 1

您必须在 select_all() 旁边使用 on_touch_down，如下所示：

#:import Clock kivy.clock.Clock

<abc>:
    BoxLayout:
        orientation: "vertical"
        size_hint_y: .5

        BoxLayout:
            orientation: "horizontal"
            spacing: 10, 10
            size_hint_x: .6

            Label:
                text: "TEXT"
                text_size: self.size
                valign: 'middle'
                size_hint_x: .2

            TextInput:
                size_hint_x: .4
                on_touch_down: Clock.schedule_once(lambda dt: self.select_all())

您可以通过类似的方式从 python 中进行操作。

*.py

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.core.window import Window
from kivy.uix.textinput import TextInput
from kivy.clock import Clock

Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (400, 50)

class abc(BoxLayout):
    pass

class MyTextInput(TextInput):
    def on_touch_down(self, touch):
        Clock.schedule_once(lambda dt: self.select_all())
        TextInput.on_touch_down(self, touch)

class Test(App):
    def build(self):
        return abc()


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

*.kv

<abc>:
    BoxLayout:
        orientation: "vertical"
        size_hint_y: .5

        BoxLayout:
            orientation: "horizontal"
            spacing: 10, 10
            size_hint_x: .6

            Label:
                text: "TEXT"
                text_size: self.size
                valign: 'middle'
                size_hint_x: .2

            MyTextInput:
                size_hint_x: .4

Answer 2

test.py

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.core.window import Window
from kivy.uix.textinput import TextInput
from kivy.clock import Clock

Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (400, 50)

class abc(BoxLayout):
    pass

class MyTextInput(TextInput):
    def on_focus(self, instance, isFocused):
        if isFocused:
            Clock.schedule_once(lambda dt: self.selected_text())

    def selected_text(self):
        ci = self.cursor_index()
        cc = self.cursor_col
        line = self._lines[self.cursor_row]
        len_line = len(line)
        start = max(0, len(line[:cc]) - line[:cc].rfind(u' ') - 1)
        end = line[cc:].find(u' ')
        end = end if end > - 1 else (len_line - cc)
        Clock.schedule_once(lambda dt: self.select_text(ci - start, ci + end))


class Test(App):
    def build(self):
        return abc()


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

test.kv

<abc>:
    BoxLayout:
        orientation: "vertical"
        size_hint_y: .5

        BoxLayout:
            orientation: "horizontal"
            spacing: 10, 10
            size_hint_x: .6

            Label:
                text: "TEXT"
                text_size: self.size
                valign: 'middle'
                size_hint_x: .2

            MyTextInput:
                size_hint_x: .4

Answer 3

解决方法如下。详情请参考sn-ps、示例和输出。

1. 使用select_all() 选择TextInput 中显示的所有文本。 注意：如果没有文本，则不会选择任何内容。
2. 当 TextInput 获得焦点时，选择被取消。因此，我们使用Clock.schedule_once()延迟文本选择

Text Input » API » Note

当 TextInput 获得焦点时，选择被取消。如果您需要在 TextInput 获得焦点时显示选择，您应该延迟（使用 Clock.schedule）对用于选择文本的函数（select_all、select_text）的调用。

片段

Python 脚本

def on_focus(self, instance):
    if instance.focus:
        Clock.schedule_once(lambda dt: instance.select_all())

kv 文件

        TextInput:
            size_hint_x: .4
            on_focus: root.on_focus(self)

示例

main.py

​​>

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.core.window import Window
from kivy.clock import Clock

Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (400, 50)


class abc(BoxLayout):
    def on_focus(self, instance):
        if instance.focus:
            print("TextInput is focused [focus={}]".format(instance.focus))
            Clock.schedule_once(lambda dt: instance.select_all())
        else:
            print("TextInput is defocused [focus={}]".format(instance.focus))


class Test(App):
    def build(self):
        return abc()


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

test.kv

#:kivy 1.11.0

<abc>:
    BoxLayout:
        orientation: "vertical"
        size_hint_y: .5

        BoxLayout:
            orientation: "horizontal"
            spacing: 10, 10
            size_hint_x: .6

            Label:
                text: "TEXT"
                text_size: self.size
                valign: 'middle'
                size_hint_x: .2

            TextInput:
                size_hint_x: .4
                on_focus: root.on_focus(self)

输出