tdesktop/Telegram/SourceFiles/info/feed/info_feed_channels_controllers.cpp

/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "info/feed/info_feed_channels_controllers.h"

#include "data/data_feed.h"
#include "data/data_session.h"
#include "info/info_controller.h"
#include "lang/lang_keys.h"
#include "history/history.h"
#include "window/window_peer_menu.h"
#include "auth_session.h"
#include "styles/style_widgets.h"
#include "styles/style_info.h"
#include "styles/style_boxes.h"

namespace Info {
namespace FeedProfile {

class ChannelsController::Row final : public PeerListRow {
public:
	Row(not_null<ChannelData*> channel);

	QSize actionSize() const override;
	QMargins actionMargins() const override;
	void paintAction(
		Painter &p,
		TimeMs ms,
		int x,
		int y,
		int outerWidth,
		bool selected,
		bool actionSelected) override;

	not_null<ChannelData*> channel() const {
		return peer()->asChannel();
	}

};

ChannelsController::Row::Row(not_null<ChannelData*> channel)
: PeerListRow(channel) {
}

QSize ChannelsController::Row::actionSize() const {
	return QRect(
			QPoint(),
			st::smallCloseIcon.size()).marginsAdded(
				st::infoFeedLeaveIconMargins).size();
}

QMargins ChannelsController::Row::actionMargins() const {
	return QMargins(
		0,
		(st::infoCommonGroupsList.item.height - actionSize().height()) / 2,
		0,
		0);
}

void ChannelsController::Row::paintAction(
		Painter &p,
		TimeMs ms,
		int x,
		int y,
		int outerWidth,
		bool selected,
		bool actionSelected) {
	if (selected) {
		x += st::infoFeedLeaveIconMargins.left();
		y += st::infoFeedLeaveIconMargins.top();
		(actionSelected
			? st::smallCloseIconOver
			: st::smallCloseIcon).paint(p, x, y, outerWidth);
	}
}

ChannelsController::ChannelsController(not_null<Controller*> controller)
: PeerListController()
, _controller(controller)
, _feed(_controller->key().feed()) {
	_controller->setSearchEnabledByContent(false);
}

auto ChannelsController::createRow(not_null<ChannelData*> channel)
-> std::unique_ptr<Row> {
	auto result = std::make_unique<Row>(channel);
	result->setCustomStatus(QString());
	return result;
}

std::unique_ptr<PeerListRow> ChannelsController::createRestoredRow(
		not_null<PeerData*> peer) {
	return createRow(peer->asChannel());
}

void ChannelsController::prepare() {
	setSearchNoResultsText(lang(lng_bot_groups_not_found));
	delegate()->peerListSetSearchMode(PeerListSearchMode::Enabled);
	delegate()->peerListSetTitle(langFactory(lng_info_feed_channels));

	rebuildRows();
	using Flag = Data::FeedUpdateFlag;
	Auth().data().feedUpdated(
	) | rpl::filter([=](const Data::FeedUpdate &update) {
		return (update.feed == _feed) && (update.flag == Flag::Channels);
	}) | rpl::filter([=] {
		return _feed->channelsLoaded();
	}) | rpl::start_with_next([=] {
		rebuildRows();
	}, lifetime());
}

void ChannelsController::rebuildRows() {
	if (!_feed->channelsLoaded()) {
		return;
	}
	const auto &channels = _feed->channels();
	auto count = delegate()->peerListFullRowsCount();
	for (auto i = 0; i != count;) {
		const auto row = delegate()->peerListRowAt(i);
		const auto peer = row->peer();
		if (ranges::find_if(channels, [=](not_null<History*> history) {
			return (history->peer == peer);
		}) != end(channels)) {
			++i;
		} else {
			delegate()->peerListRemoveRow(row);
			--count;
		}
	}
	for (const auto history : channels) {
		if (auto row = createRow(history->peer->asChannel())) {
			delegate()->peerListAppendRow(std::move(row));
		}
	}
	delegate()->peerListRefreshRows();
}

std::unique_ptr<PeerListState> ChannelsController::saveState() const {
	auto result = PeerListController::saveState();
	auto my = std::make_unique<SavedState>();
	using Flag = Data::FeedUpdateFlag;
	Auth().data().feedUpdated(
	) | rpl::filter([=](const Data::FeedUpdate &update) {
		return (update.feed == _feed) && (update.flag == Flag::Channels);
	}) | rpl::start_with_next([state = result.get()] {
		state->controllerState = nullptr;
	}, my->lifetime);
	result->controllerState = std::move(my);
	return result;
}

void ChannelsController::restoreState(
		std::unique_ptr<PeerListState> state) {
	PeerListController::restoreState(std::move(state));
}

void ChannelsController::rowClicked(not_null<PeerListRow*> row) {
	_controller->parentController()->showPeerHistory(
		row->peer(),
		Window::SectionShow::Way::Forward);
}

void ChannelsController::rowActionClicked(not_null<PeerListRow*> row) {
	Window::DeleteAndLeaveHandler(row->peer())();
}

} // namespace FeedProfile
} // namespace Info