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Callback.py
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Callback.py
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class ReactiveData:
def __init__(self, initial_value):
self._value = initial_value
self._callbacks = []
@property
def value(self):
return self._value
@value.setter
def value(self, new_value):
self._value = new_value
self._notify_callbacks()
def add_callback(self, callback):
self._callbacks.append(callback)
def _notify_callbacks(self):
for callback in self._callbacks:
callback(self._value)
# 创建一个 ReactiveData 实例
data = ReactiveData("Hello")
# 定义一个回调函数,在数据发生变化时打印新值
def callback(value):
print("Value changed:这里相当于表现层的变化", value)
# 将回调函数添加到 ReactiveData 实例中
data.add_callback(callback)
# 模拟数据双向绑定,通过命令行实现交互
while True:
print("Current value:当前UI层是", data.value)
new_value = input("Enter a new value (press 'q' to quit): 这里相当于在前端具有v-model中的input事件,实现了数据的双向绑定\n")
if new_value.lower() == 'q':
break
data.value = new_value