KIVY python - 更改 TextInput 颜色

Question

我想在用户修改 TextInput 时更改包含的文本的颜色。示例：

有文字输入，里面有'pre-written'文字
如果您修改此文本的一个字符，它的颜色会立即变为红色

debug2.py

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder



class MyDebug(BoxLayout):
    def __init__(self, **kwargs):
        super(MyDebug, self).__init__(**kwargs)

Builder.load_file("debug2.kv")

class MyAppli(App):

    def build(self):
        return MyDebug()

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

debug2.kv

#:kivy 1.9.1

<MyDebug>:

    TextInput:
        text: "Edit me !" # change color to (1, 0, 0, 1) when modified
        foreground_color: (0.3, 0.4, 0.5, 1)

Answer 1

给你

py:

class ColorTextInput(TextInput):

    def changetored(self):
        if self.text != "Edit me !":
            self.foreground_color = (1,0,0,1)

kv:

ColorTextInput:
    text: "Edit me !" # change color to (1, 0, 0, 1) when modified
    on_text: self.changetored()

Answer 2

您将一个方法添加到您的根小部件 MyDebug 和一个事件，on_text 到您的 kv 文件中，如下所示：

片段

debug2.py

class MyDebug(BoxLayout):
    def __init__(self, **kwargs):
        super(MyDebug, self).__init__(**kwargs)

    def on_text_change(self, instance, value):
        instance.foreground_color = (1, 0, 0, 1)

debug2.kv

<MyDebug>:
    TextInput:
        text: "Edit me !" # change color to (1, 0, 0, 1) when modified
        foreground_color: (0.3, 0.4, 0.5, 1)
        on_text: root.on_text_change(self, self.text)

输出

Answer 3

更改文本颜色的最简单方法是使用 on_text

TextInput:
    text: 'Color will change from black to red if text is modified'
    on_text: self.foreground_color = (1,0,0,1)##red
    foreground_color = (0,0,0,1)

KIVY python - 更改 TextInput 颜色

KIVY python - change TextInput color

textinput

kivy

片段

debug2.py

debug2.kv

输出