kviy TextInput 触发事件

from kivy.uix.widget import Widget
from kivy.app import App
from kivy.lang import Builder

Builder.load_string("""
<WidgetLayoutWidget>:
    # 加一个白色画布
    canvas:
        Color:
            rgba:(1,1,1,1)
        Rectangle:
            pos:self.pos
            size:self.size
    TextInput:
        text:'c0c.ink'
        multiline:False
        pos:400,380
        allow_copy:False
        # 先中后按回车触发事件
        on_text_validate:self.pos=[self.x,self.y-5]

    TextInput:
        text: 'hello'
        pos: 100, 180
        halign: 'center'
        background_color: 100, 2, 2, 1
        # 文本改变触发事件，改一个字也算
        on_text: self.pos=[self.x+5, self.y]
    TextInput:
        text:'first'
        pos:400,180
        readonly:True
        # 双击触发
        on_double_tap:self.pos=[self.x-5,self.y]
        # 三击触发
        on_triple_tap:self.pos = [self.x,self.y+5]
        # 四指触摸
        on_quad_touch:self.pos=[400,180]

""")

class WidgetLayoutWidget(Widget):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

class GotoApp(App):
    def build(self):
        return WidgetLayoutWidget()

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