def get_width(self):
js = """
let canvas = document.createElement('canvas');
canvas.style.position = "absolute";
let ctx = canvas.getContext('2d');
document.body.appendChild(canvas);
ctx.font = `16px Menlo, consolas, DejaVu Sans Mono, Courier New, monospace`;
document.body.removeChild(canvas);
let text = ctx.measureText('0');
ctx.fillText('0', 50, 50);
($('#pywebio-scope-{scope}').width()-16)/\
$('#pywebio-scope-{scope}').css('font-size').slice(0, -2)/text.width*16;\
""".format(scope=self.scope)
width = eval_js(js)
return 80 if width is None else 128 if width > 128 else int(width)
def get_localstorage(key):
return eval_js("localStorage.getItem(key)", key=key)
def get_window_visibility_state():
ret = eval_js("document.visibilityState")
return False if ret == "hidden" else True