"""
The MIT License (MIT)
Copyright (c) 2015-present Rapptz
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
"""
from __future__ import annotations
from typing import Any, Callable, ClassVar, Dict, Iterator, List, Optional, Sequence, TYPE_CHECKING, Tuple
from functools import partial
from itertools import groupby
import traceback
import asyncio
import sys
import time
import os
from .item import Item, ItemCallbackType
from ..components import (
Component,
ActionRow as ActionRowComponent,
_component_factory,
Button as ButtonComponent,
SelectMenu as SelectComponent,
)
__all__ = (
'View',
)
if TYPE_CHECKING:
from ..interactions import Interaction
from ..message import Message
from ..types.components import Component as ComponentPayload
from ..state import ConnectionState
def _walk_all_components(components: List[Component]) -> Iterator[Component]:
for item in components:
if isinstance(item, ActionRowComponent):
yield from item.children
else:
yield item
def _component_to_item(component: Component) -> Item:
if isinstance(component, ButtonComponent):
from .button import Button
return Button.from_component(component)
if isinstance(component, SelectComponent):
from .select import Select
return Select.from_component(component)
return Item.from_component(component)
class _ViewWeights:
__slots__ = (
'weights',
)
def __init__(self, children: List[Item]):
self.weights: List[int] = [0, 0, 0, 0, 0]
key = lambda i: sys.maxsize if i.row is None else i.row
children = sorted(children, key=key)
for row, group in groupby(children, key=key):
for item in group:
self.add_item(item)
def find_open_space(self, item: Item) -> int:
for index, weight in enumerate(self.weights):
if weight + item.width <= 5:
return index
raise ValueError('could not find open space for item')
def add_item(self, item: Item) -> None:
if item.row is not None:
total = self.weights[item.row] + item.width
if total > 5:
raise ValueError(f'item would not fit at row {item.row} ({total} > 5 width)')
self.weights[item.row] = total
item._rendered_row = item.row
else:
index = self.find_open_space(item)
self.weights[index] += item.width
item._rendered_row = index
def remove_item(self, item: Item) -> None:
if item._rendered_row is not None:
self.weights[item._rendered_row] -= item.width
item._rendered_row = None
def clear(self) -> None:
self.weights = [0, 0, 0, 0, 0]
class View:
"""Represents a UI view.
This object must be inherited to create a UI within Discord.
.. versionadded:: 2.0
Parameters
-----------
timeout: Optional[:class:`float`]
Timeout in seconds from last interaction with the UI before no longer accepting input.
If ``None`` then there is no timeout.
Attributes
------------
timeout: Optional[:class:`float`]
Timeout from last interaction with the UI before no longer accepting input.
If ``None`` then there is no timeout.
children: List[:class:`Item`]
The list of children attached to this view.
"""
__discord_ui_view__: ClassVar[bool] = True
__view_children_items__: ClassVar[List[ItemCallbackType]] = []
def __init_subclass__(cls) -> None:
children: List[ItemCallbackType] = []
for base in reversed(cls.__mro__):
for member in base.__dict__.values():
if hasattr(member, '__discord_ui_model_type__'):
children.append(member)
if len(children) > 25:
raise TypeError('View cannot have more than 25 children')
cls.__view_children_items__ = children
def __init__(self, *, timeout: Optional[float] = 180.0):
self.timeout = timeout
self.children: List[Item] = []
for func in self.__view_children_items__:
item: Item = func.__discord_ui_model_type__(**func.__discord_ui_model_kwargs__)
item.callback = partial(func, self, item)
item._view = self
setattr(self, func.__name__, item)
self.children.append(item)
self.__weights = _ViewWeights(self.children)
loop = asyncio.get_running_loop()
self.id: str = os.urandom(16).hex()
self.__cancel_callback: Optional[Callable[[View], None]] = None
self.__timeout_expiry: Optional[float] = None
self.__timeout_task: Optional[asyncio.Task[None]] = None
self.__stopped: asyncio.Future[bool] = loop.create_future()
def __repr__(self) -> str:
return f'<{self.__class__.__name__} timeout={self.timeout} children={len(self.children)}>'
async def __timeout_task_impl(self) -> None:
while True:
# Guard just in case someone changes the value of the timeout at runtime
if self.timeout is None:
return
if self.__timeout_expiry is None:
return self._dispatch_timeout()
# Check if we've elapsed our currently set timeout
now = time.monotonic()
if now >= self.__timeout_expiry:
return self._dispatch_timeout()
# Wait N seconds to see if timeout data has been refreshed
await asyncio.sleep(self.__timeout_expiry - now)
def to_components(self) -> List[Dict[str, Any]]:
def key(item: Item) -> int:
return item._rendered_row or 0
children = sorted(self.children, key=key)
components: List[Dict[str, Any]] = []
for _, group in groupby(children, key=key):
children = [item.to_component_dict() for item in group]
if not children:
continue
components.append(
{
'type': 1,
'components': children,
}
)
return components
@classmethod
def from_message(cls, message: Message, /, *, timeout: Optional[float] = 180.0) -> View:
"""Converts a message's components into a :class:`View`.
The :attr:`.Message.components` of a message are read-only
and separate types from those in the ``discord.ui`` namespace.
In order to modify and edit message components they must be
converted into a :class:`View` first.
Parameters
-----------
message: :class:`discord.Message`
The message with components to convert into a view.
timeout: Optional[:class:`float`]
The timeout of the converted view.
Returns
--------
:class:`View`
The converted view. This always returns a :class:`View` and not
one of its subclasses.
"""
view = View(timeout=timeout)
for component in _walk_all_components(message.components):
view.add_item(_component_to_item(component))
return view
@property
def _expires_at(self) -> Optional[float]:
if self.timeout:
return time.monotonic() + self.timeout
return None
def add_item(self, item: Item) -> None:
"""Adds an item to the view.
Parameters
-----------
item: :class:`Item`
The item to add to the view.
Raises
--------
TypeError
An :class:`Item` was not passed.
ValueError
Maximum number of children has been exceeded (25)
or the row the item is trying to be added to is full.
"""
if len(self.children) > 25:
raise ValueError('maximum number of children exceeded')
if not isinstance(item, Item):
raise TypeError(f'expected Item not {item.__class__!r}')
self.__weights.add_item(item)
item._view = self
self.children.append(item)
def remove_item(self, item: Item) -> None:
"""Removes an item from the view.
Parameters
-----------
item: :class:`Item`
The item to remove from the view.
"""
try:
self.children.remove(item)
except ValueError:
pass
else:
self.__weights.remove_item(item)
def clear_items(self) -> None:
"""Removes all items from the view."""
self.children.clear()
self.__weights.clear()
async def interaction_check(self, interaction: Interaction) -> bool:
"""|coro|
A callback that is called when an interaction happens within the view
that checks whether the view should process item callbacks for the interaction.
This is useful to override if, for example, you want to ensure that the
interaction author is a given user.
The default implementation of this returns ``True``.
.. note::
If an exception occurs within the body then the check
is considered a failure and :meth:`on_error` is called.
Parameters
-----------
interaction: :class:`~discord.Interaction`
The interaction that occurred.
Returns
---------
:class:`bool`
Whether the view children's callbacks should be called.
"""
return True
async def on_timeout(self) -> None:
"""|coro|
A callback that is called when a view's timeout elapses without being explicitly stopped.
"""
pass
async def on_error(self, error: Exception, item: Item, interaction: Interaction) -> None:
"""|coro|
A callback that is called when an item's callback or :meth:`interaction_check`
fails with an error.
The default implementation prints the traceback to stderr.
Parameters
-----------
error: :class:`Exception`
The exception that was raised.
item: :class:`Item`
The item that failed the dispatch.
interaction: :class:`~discord.Interaction`
The interaction that led to the failure.
"""
print(f'Ignoring exception in view {self} for item {item}:', file=sys.stderr)
traceback.print_exception(error.__class__, error, error.__traceback__, file=sys.stderr)
async def _scheduled_task(self, item: Item, interaction: Interaction):
try:
if self.timeout:
self.__timeout_expiry = time.monotonic() + self.timeout
allow = await self.interaction_check(interaction)
if not allow:
return
await item.callback(interaction)
if not interaction.response._responded:
await interaction.response.defer()
except Exception as e:
return await self.on_error(e, item, interaction)
def _start_listening_from_store(self, store: ViewStore) -> None:
self.__cancel_callback = partial(store.remove_view)
if self.timeout:
loop = asyncio.get_running_loop()
if self.__timeout_task is not None:
self.__timeout_task.cancel()
self.__timeout_expiry = time.monotonic() + self.timeout
self.__timeout_task = loop.create_task(self.__timeout_task_impl())
def _dispatch_timeout(self):
if self.__stopped.done():
return
self.__stopped.set_result(True)
asyncio.create_task(self.on_timeout(), name=f'discord-ui-view-timeout-{self.id}')
def _dispatch_item(self, item: Item, interaction: Interaction):
if self.__stopped.done():
return
asyncio.create_task(self._scheduled_task(item, interaction), name=f'discord-ui-view-dispatch-{self.id}')
def refresh(self, components: List[Component]):
# This is pretty hacky at the moment
# fmt: off
old_state: Dict[Tuple[int, str], Item] = {
(item.type.value, item.custom_id): item # type: ignore
for item in self.children
if item.is_dispatchable()
}
# fmt: on
children: List[Item] = []
for component in _walk_all_components(components):
try:
older = old_state[(component.type.value, component.custom_id)] # type: ignore
except (KeyError, AttributeError):
children.append(_component_to_item(component))
else:
older.refresh_component(component)
children.append(older)
self.children = children
def stop(self) -> None:
"""Stops listening to interaction events from this view.
This operation cannot be undone.
"""
if not self.__stopped.done():
self.__stopped.set_result(False)
self.__timeout_expiry = None
if self.__timeout_task is not None:
self.__timeout_task.cancel()
self.__timeout_task = None
if self.__cancel_callback:
self.__cancel_callback(self)
self.__cancel_callback = None
def is_finished(self) -> bool:
""":class:`bool`: Whether the view has finished interacting."""
return self.__stopped.done()
def is_dispatching(self) -> bool:
""":class:`bool`: Whether the view has been added for dispatching purposes."""
return self.__cancel_callback is not None
def is_persistent(self) -> bool:
""":class:`bool`: Whether the view is set up as persistent.
A persistent view has all their components with a set ``custom_id`` and
a :attr:`timeout` set to ``None``.
"""
return self.timeout is None and all(item.is_persistent() for item in self.children)
async def wait(self) -> bool:
"""Waits until the view has finished interacting.
A view is considered finished when :meth:`stop` is called
or it times out.
Returns
--------
:class:`bool`
If ``True``, then the view timed out. If ``False`` then
the view finished normally.
"""
return await self.__stopped
class ViewStore:
def __init__(self, state: ConnectionState):
# (component_type, custom_id): (View, Item)
self._views: Dict[Tuple[int, str], Tuple[View, Item]] = {}
# message_id: View
self._synced_message_views: Dict[int, View] = {}
self._state: ConnectionState = state
@property
def persistent_views(self) -> Sequence[View]:
# fmt: off
views = {
view.id: view
for (_, (view, _)) in self._views.items()
if view.is_persistent()
}
# fmt: on
return list(views.values())
def __verify_integrity(self):
to_remove: List[Tuple[int, str]] = []
now = time.monotonic()
for (k, (view, _)) in self._views.items():
if view.is_finished():
to_remove.append(k)
for k in to_remove:
del self._views[k]
def add_view(self, view: View, message_id: Optional[int] = None):
self.__verify_integrity()
view._start_listening_from_store(self)
for item in view.children:
if item.is_dispatchable():
self._views[(item.type.value, item.custom_id)] = (view, item) # type: ignore
if message_id is not None:
self._synced_message_views[message_id] = view
def remove_view(self, view: View):
for item in view.children:
if item.is_dispatchable():
self._views.pop((item.type.value, item.custom_id), None) # type: ignore
for key, value in self._synced_message_views.items():
if value.id == view.id:
del self._synced_message_views[key]
break
def dispatch(self, component_type: int, custom_id: str, interaction: Interaction):
self.__verify_integrity()
key = (component_type, custom_id)
value = self._views.get(key)
if value is None:
return
view, item = value
item.refresh_state(interaction)
view._dispatch_item(item, interaction)
def is_message_tracked(self, message_id: int):
return message_id in self._synced_message_views
def remove_message_tracking(self, message_id: int) -> Optional[View]:
return self._synced_message_views.pop(message_id, None)
def update_from_message(self, message_id: int, components: List[ComponentPayload]):
# pre-req: is_message_tracked == true
view = self._synced_message_views[message_id]
view.refresh([_component_factory(d) for d in components])