def App():
is_sent, set_is_sent = use_state(False)
message, set_message = use_state("")
if is_sent:
return html.div(
html.h1("Message sent!"),
html.button(
{"onClick": lambda event: set_is_sent(False)}, "Send new message?"
),
)
@event(prevent_default=True)
def handle_submit(event):
set_message("")
set_is_sent(True)
return html.form(
{"onSubmit": handle_submit, "style": {"display": "inline-grid"}},
html.textarea(
{
"placeholder": "Your message here...",
"value": message,
"onChange": lambda event: set_message(event["target"]["value"]),
}
),
html.button({"type": "submit"}, "Send"),
)
def ArtistList():
artist_to_add, set_artist_to_add = use_state("")
artists, set_artists = use_state(
["Marta Colvin Andrade", "Lamidi Olonade Fakeye", "Louise Nevelson"])
def handle_change(event):
set_artist_to_add(event["target"]["value"])
def handle_add_click(event):
if artist_to_add not in artists:
set_artists([*artists, artist_to_add])
set_artist_to_add("")
def make_handle_delete_click(index):
def handle_click(event):
set_artists(artists[:index] + artists[index + 1:])
return handle_click
return html.div(
html.h1("Inspiring sculptors:"),
html.input({
"value": artist_to_add,
"onChange": handle_change
}),
html.button({"onClick": handle_add_click}, "add"),
html.ul([
html.li(
name,
html.button({"onClick": make_handle_delete_click(index)},
"delete"),
key=name,
) for index, name in enumerate(artists)
]),
)
def Root():
left_value, set_left.current = idom.use_state(1)
right_value, set_right.current = idom.use_state(1)
return idom.html.div(
LeftContext(Left(), value=left_value),
RightContext(Right(), value=right_value),
)
def Definitions():
term_to_add, set_term_to_add = use_state(None)
definition_to_add, set_definition_to_add = use_state(None)
all_terms, set_all_terms = use_state({})
def handle_term_to_add_change(event):
set_term_to_add(event["target"]["value"])
def handle_definition_to_add_change(event):
set_definition_to_add(event["target"]["value"])
def handle_add_click(event):
if term_to_add and definition_to_add:
set_all_terms({**all_terms, term_to_add: definition_to_add})
set_term_to_add(None)
set_definition_to_add(None)
def make_delete_click_handler(term_to_delete):
def handle_click(event):
set_all_terms({t: d for t, d in all_terms.items() if t != term_to_delete})
return handle_click
return html.div(
html.button({"onClick": handle_add_click}, "add term"),
html.label(
"Term: ",
html.input({"value": term_to_add, "onChange": handle_term_to_add_change}),
),
html.label(
"Definition: ",
html.input(
{
"value": definition_to_add,
"onChange": handle_definition_to_add_change,
}
),
),
html.hr(),
[
html.div(
html.button(
{"onClick": make_delete_click_handler(term)}, "delete term"
),
html.dt(term),
html.dd(definition),
key=term,
)
for term, definition in all_terms.items()
],
)
def Scene():
position, set_position = use_state(Position(100, 100, 0))
return html.div(
{"style": {"width": "225px"}},
html.div(
{
"style": {
"width": "200px",
"height": "200px",
"backgroundColor": "slategray",
}
},
image(
"png",
CHARACTER_IMAGE,
{
"style": {
"position": "relative",
"left": f"{position.x}px",
"top": f"{position.y}.px",
"transform": f"rotate({position.angle}deg) scale(2, 2)",
}
},
),
),
html.button({"onClick": lambda e: set_position(translate(x=-10))}, "Move Left"),
html.button({"onClick": lambda e: set_position(translate(x=10))}, "Move Right"),
html.button({"onClick": lambda e: set_position(translate(y=-10))}, "Move Up"),
html.button({"onClick": lambda e: set_position(translate(y=10))}, "Move Down"),
html.button({"onClick": lambda e: set_position(rotate(-30))}, "Rotate Left"),
html.button({"onClick": lambda e: set_position(rotate(30))}, "Rotate Right"),
)
def MovingDot():
position, set_position = use_state({"x": 0, "y": 0})
async def handle_pointer_move(event):
outer_div_info = event["currentTarget"]
outer_div_bounds = outer_div_info["boundingClientRect"]
set_position({
"x": event["clientX"] - outer_div_bounds["x"],
"y": event["clientY"] - outer_div_bounds["y"],
})
return html.div(
{
"onPointerMove": handle_pointer_move,
"style": {
"position": "relative",
"height": "200px",
"width": "100%",
"backgroundColor": "white",
},
},
html.div({
"style": {
"position": "absolute",
"backgroundColor": "red",
"borderRadius": "50%",
"width": "20px",
"height": "20px",
"left": "-10px",
"top": "-10px",
"transform":
f"translate({position['x']}px, {position['y']}px)",
},
}),
)
def ColorButton():
color, set_color = use_state("gray")
def handle_click(event):
set_color("orange")
set_color("pink")
set_color("blue")
def handle_reset(event):
set_color("gray")
return html.div(
html.button(
{
"onClick": handle_click,
"style": {
"backgroundColor": color
}
}, "Set Color"),
html.button(
{
"onClick": handle_reset,
"style": {
"backgroundColor": color
}
}, "Reset"),
)
def Grid():
line_size = 5
selected_indices, set_selected_indices = use_state({1, 2, 4})
def make_handle_click(index):
def handle_click(event):
if index in selected_indices:
set_selected_indices(selected_indices - {index})
else:
set_selected_indices(selected_indices | {index})
return handle_click
return html.div(
{"style": {"display": "flex", "flex-direction": "row"}},
[
html.div(
{
"onClick": make_handle_click(index),
"style": {
"height": "30px",
"width": "30px",
"backgroundColor": (
"black" if index in selected_indices else "white"
),
"outline": "1px solid grey",
"cursor": "pointer",
},
},
key=index,
)
for index in range(line_size)
],
)
def SomeComponent():
items, set_items.current = idom.use_state([1, 2, 3])
return idom.html.div([
idom.html.div(
idom.html.input({"onChange": lambda event: None}),
key=str(i),
) for i in items
])
def App():
recipient, set_recipient = use_state("Alice")
message, set_message = use_state("")
@event(prevent_default=True)
async def handle_submit(event):
set_message("")
print("About to send message...")
await asyncio.sleep(5)
print(f"Sent '{message}' to {recipient}")
return html.form(
{
"onSubmit": handle_submit,
"style": {
"display": "inline-grid"
}
},
html.label(
"To: ",
html.select(
{
"value":
recipient,
"onChange":
lambda event: set_recipient(event["target"]["value"]),
},
html.option({"value": "Alice"}, "Alice"),
html.option({"value": "Bob"}, "Bob"),
),
),
html.input({
"type":
"text",
"placeholder":
"Your message...",
"value":
message,
"onChange":
lambda event: set_message(event["target"]["value"]),
}),
html.button({"type": "submit"}, "Send"),
)
def Counter():
number, set_number = use_state(0)
async def handle_click(event):
await asyncio.sleep(3)
set_number(lambda old_number: old_number + 1)
return html.div(
html.h1(number),
html.button({"onClick": handle_click}, "Increment"),
)
def Counter():
number, set_number = use_state(0)
def handle_click(event):
set_number(number + 5)
print(number)
return html.div(
html.h1(number),
html.button({"onClick": handle_click}, "Increment"),
)
def ArtistList():
artist_to_add, set_artist_to_add = use_state("")
artists, set_artists = use_state([])
def handle_change(event):
set_artist_to_add(event["target"]["value"])
def handle_click(event):
if artist_to_add and artist_to_add not in artists:
set_artists([*artists, artist_to_add])
set_artist_to_add("")
return html.div(
html.h1("Inspiring sculptors:"),
html.input({
"value": artist_to_add,
"onChange": handle_change
}),
html.button({"onClick": handle_click}, "add"),
html.ul([html.li(name, key=name) for name in artists]),
)
def Counter():
number, set_number = use_state(0)
async def handle_click(event):
set_number(number + 5)
print("about to print...")
await asyncio.sleep(3)
print(number)
return html.div(
html.h1(number),
html.button({"onClick": handle_click}, "Increment"),
)
def ArtistList():
artists, set_artists = use_state(
["Marta Colvin Andrade", "Lamidi Olonade Fakeye", "Louise Nevelson"])
def handle_sort_click(event):
set_artists(list(sorted(artists)))
def handle_reverse_click(event):
set_artists(list(reversed(artists)))
return html.div(
html.h1("Inspiring sculptors:"),
html.button({"onClick": handle_sort_click}, "sort"),
html.button({"onClick": handle_reverse_click}, "reverse"),
html.ul([html.li(name, key=name) for name in artists]),
)
def Form():
person, set_person = use_state({
"first_name": "Barbara",
"last_name": "Hepworth",
"email": "*****@*****.**",
})
def handle_first_name_change(event):
set_person({**person, "first_name": event["target"]["value"]})
def handle_last_name_change(event):
set_person({**person, "last_name": event["target"]["value"]})
def handle_email_change(event):
set_person({**person, "email": event["target"]["value"]})
return html.div(
html.label(
"First name: ",
html.input(
{
"value": person["first_name"],
"onChange": handle_first_name_change
}, ),
),
html.label(
"First name: ",
html.input(
{
"value": person["last_name"],
"onChange": handle_last_name_change
}, ),
),
html.label(
"First name: ",
html.input(
{
"value": person["email"],
"onChange": handle_email_change
}, ),
),
html.p(
f"{person['first_name']} {person['last_name']} {person['email']}"),
)
def CounterList():
counters, set_counters = use_state([0, 0, 0])
def make_increment_click_handler(index):
def handle_click(event):
new_value = counters[index] + 1
set_counters(counters[:index] + [new_value] + counters[index + 1 :])
return handle_click
return html.ul(
[
html.li(
count,
html.button({"onClick": make_increment_click_handler(index)}, "+1"),
key=index,
)
for index, count in enumerate(counters)
]
)
def Outer():
inner_value, set_outer_value.current = idom.use_state(1)
outer_value.current = idom.use_context(Context)
outer_render_count.current += 1
return Context(Inner(), value=inner_value)
def use_toggle(initial=True):
state, set_state = use_state(initial)
return state, lambda: set_state(not state)
def use_counter(initial_value):
state, set_state = use_state(initial_value)
return state, lambda: set_state(state + 1)
def Outer():
state, set_outer_state.current = idom.use_state(0)
inner_key, set_inner_key.current = idom.use_state("first")
return idom.html.div(state, Inner(key=inner_key))
def SetStateDuringRender():
render_count.current += 1
state, set_state = idom.use_state(0)
if not state:
set_state(state + 1)
return html.div(state)
def Inner():
state, set_inner_state.current = idom.use_state(make_default)
return idom.html.div(state)
def SomeComponent():
message, set_message.current = idom.use_state("hello")
idom.use_debug_value(lambda: f"message is {message!r}")
return idom.html.div()
def OuterComponent():
key, set_key.current = idom.use_state("first")
return ComponentWithEffect(key=key)
def ComponentProvidesContext():
state, set_state.current = idom.use_state(0)
return Context(ComponentInContext(), value=state)
def Root():
outer_value, set_root_value.current = idom.use_state(-1)
return Context(Outer(), value=outer_value)
