python - 基维 - MotionEvent : on_mouse_pos

Question

kivy是否支持在不按下鼠标按钮的情况下在mouse_pos发生变化时触发的MouseEvent？

我在文档中发现了这个:

def on_motion(self, etype, motionevent):
    # will receive all motion events.
    pass

Window.bind(on_motion=on_motion)

You can also listen to changes of the mouse position by watching mouse_pos.

但是我无法实现它。我设法绑定(bind)它并添加到 on_motion 函数 'print('Hello world')' 但它仅由按下类型事件触发。

提前致谢

Answer 1

解决方案

将 mouse_pos 绑定(bind)到回调。详情请引用示例。

Window.bind(mouse_pos=self.mouse_pos)

例子

主.py

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.core.window import Window


class MousePosDemo(BoxLayout):

    def __init__(self, **kwargs):
        super(MousePosDemo, self).__init__(**kwargs)
        self.label = Label()
        self.add_widget(self.label)
        Window.bind(mouse_pos=self.mouse_pos)

    def mouse_pos(self, window, pos):
        self.label.text = str(pos)


class TestApp(App):
    title = "Kivy Mouse Pos Demo"

    def build(self):
        return MousePosDemo()


if __name__ == "__main__":
    TestApp().run()

输出