tdesktop/Telegram/SourceFiles/observer_peer.h

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/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once
#include <rpl/producer.h>
#include <rpl/filter.h>
#include <rpl/then.h>
#include <rpl/range.h>
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#include "base/observer.h"
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#include "base/flags.h"
namespace Notify {
// Generic notifications about updates of some PeerData.
// You can subscribe to them by Notify::registerPeerObserver().
// 0x0000FFFFU for general peer updates (valid for any peer).
// 0xFFFF0000U for specific peer updates (valid for user / chat / channel).
struct PeerUpdate {
PeerUpdate(PeerData *updated = nullptr) : peer(updated) {
}
PeerData *peer;
enum class Flag : uint32 {
None = 0,
// Common flags
NameChanged = (1 << 0),
UsernameChanged = (1 << 1),
PhotoChanged = (1 << 2),
AboutChanged = (1 << 3),
NotificationsEnabled = (1 << 4),
SharedMediaChanged = (1 << 5),
MigrationChanged = (1 << 6),
PinnedChanged = (1 << 7),
RestrictionReasonChanged = (1 << 8),
// For chats and channels
InviteLinkChanged = (1 << 9),
MembersChanged = (1 << 10),
AdminsChanged = (1 << 11),
BannedUsersChanged = (1 << 12),
UnreadMentionsChanged = (1 << 13),
// For users
UserCanShareContact = (1 << 16),
UserIsContact = (1 << 17),
UserPhoneChanged = (1 << 18),
UserIsBlocked = (1 << 19),
BotCommandsChanged = (1 << 20),
UserOnlineChanged = (1 << 21),
BotCanAddToGroups = (1 << 22),
UserCommonChatsChanged = (1 << 23),
UserHasCalls = (1 << 24),
// For chats
ChatCanEdit = (1 << 16),
// For channels
ChannelAmIn = (1 << 16),
ChannelRightsChanged = (1 << 17),
ChannelStickersChanged = (1 << 18),
ChannelPinnedChanged = (1 << 19),
};
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using Flags = base::flags<Flag>;
friend inline constexpr auto is_flag_type(Flag) { return true; }
Flags flags = 0;
// NameChanged data
PeerData::NameFirstChars oldNameFirstChars;
// SharedMediaChanged data
int32 mediaTypesMask = 0;
};
void peerUpdatedDelayed(const PeerUpdate &update);
inline void peerUpdatedDelayed(PeerData *peer, PeerUpdate::Flags events) {
PeerUpdate update(peer);
update.flags = events;
peerUpdatedDelayed(update);
}
void peerUpdatedSendDelayed();
inline void mediaOverviewUpdated(PeerData *peer, MediaOverviewType type) {
PeerUpdate update(peer);
update.flags |= PeerUpdate::Flag::SharedMediaChanged;
update.mediaTypesMask |= (1 << type);
peerUpdatedDelayed(update);
}
class PeerUpdatedHandler {
public:
template <typename Lambda>
PeerUpdatedHandler(PeerUpdate::Flags events, Lambda &&handler) : _events(events), _handler(std::move(handler)) {
}
void operator()(const PeerUpdate &update) const {
if (update.flags & _events) {
_handler(update);
}
}
private:
PeerUpdate::Flags _events;
base::lambda<void(const PeerUpdate&)> _handler;
};
base::Observable<PeerUpdate, PeerUpdatedHandler> &PeerUpdated();
inline auto PeerUpdateViewer(
PeerUpdate::Flags flags) {
return rpl::make_producer<PeerUpdate>([=](
const auto &consumer) {
auto lifetime = rpl::lifetime();
lifetime.make_state<base::Subscription>(
PeerUpdated().add_subscription({ flags, [=](
const PeerUpdate &update) {
consumer.put_next_copy(update);
}}));
return lifetime;
});
}
inline auto PeerUpdateViewer(
not_null<PeerData*> peer,
PeerUpdate::Flags flags) {
return PeerUpdateViewer(flags)
| rpl::filter([=](const PeerUpdate &update) {
return (update.peer == peer);
});
}
inline auto PeerUpdateValue(
not_null<PeerData*> peer,
PeerUpdate::Flags flags) {
auto initial = PeerUpdate(peer);
initial.flags = flags;
return rpl::single(initial)
| rpl::then(PeerUpdateViewer(peer, flags));
}
} // namespace Notify