import mesop as me


@me.stateclass
class State:
  checked: bool


def on_update(event: me.CheckboxChangeEvent):
  state = me.state(State)
  state.checked = event.checked


def load(e: me.LoadEvent):
  me.set_theme_mode("system")


@me.page(
  on_load=load,
  security_policy=me.SecurityPolicy(
    allowed_iframe_parents=["https://google.github.io", "https://huggingface.co"]
  ),
  path="/checkbox",
)
def app():
  with me.box(style=me.Style(margin=me.Margin.all(15))):
    state = me.state(State)
    me.checkbox(
      "Simple checkbox",
      on_change=on_update,
    )

    if state.checked:
      me.text(text="is checked")
    else:
      me.text(text="is not checked")