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Telegram/SourceFiles/info/stories/info_stories_provider.h

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+/*
+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
+*/
+#pragma once
+
+#include "base/weak_ptr.h"
+#include "data/data_stories_ids.h"
+#include "info/media/info_media_common.h"
+#include "info/stories/info_stories_common.h"
+
+class DocumentData;
+class HistoryItem;
+class PeerData;
+class History;
+
+namespace Data {
+class Story;
+} // namespace Data
+
+namespace Info {
+class AbstractController;
+} // namespace Info
+
+namespace Info::Stories {
+
+class Provider final
+	: public Media::ListProvider
+	, private Media::ListSectionDelegate
+	, public base::has_weak_ptr {
+public:
+	explicit Provider(not_null<AbstractController*> controller);
+	~Provider();
+
+	Media::Type type() override;
+	bool hasSelectRestriction() override;
+	rpl::producer<bool> hasSelectRestrictionChanges() override;
+	bool isPossiblyMyItem(not_null<const HistoryItem*> item) override;
+
+	std::optional<int> fullCount() override;
+
+	void restart() override;
+	void checkPreload(
+		QSize viewport,
+		not_null<Media::BaseLayout*> topLayout,
+		not_null<Media::BaseLayout*> bottomLayout,
+		bool preloadTop,
+		bool preloadBottom) override;
+	void refreshViewer() override;
+	rpl::producer<> refreshed() override;
+
+	void setSearchQuery(QString query) override;
+
+	std::vector<Media::ListSection> fillSections(
+		not_null<Overview::Layout::Delegate*> delegate) override;
+	rpl::producer<not_null<Media::BaseLayout*>> layoutRemoved() override;
+	Media::BaseLayout *lookupLayout(const HistoryItem *item) override;
+	bool isMyItem(not_null<const HistoryItem*> item) override;
+	bool isAfter(
+		not_null<const HistoryItem*> a,
+		not_null<const HistoryItem*> b) override;
+
+	Media::ListItemSelectionData computeSelectionData(
+		not_null<const HistoryItem*> item,
+		TextSelection selection) override;
+	void applyDragSelection(
+		Media::ListSelectedMap &selected,
+		not_null<const HistoryItem*> fromItem,
+		bool skipFrom,
+		not_null<const HistoryItem*> tillItem,
+		bool skipTill) override;
+
+	bool allowSaveFileAs(
+		not_null<const HistoryItem*> item,
+		not_null<DocumentData*> document) override;
+	QString showInFolderPath(
+		not_null<const HistoryItem*> item,
+		not_null<DocumentData*> document) override;
+
+	int64 scrollTopStatePosition(not_null<HistoryItem*> item) override;
+	HistoryItem *scrollTopStateItem(
+		Media::ListScrollTopState state) override;
+	void saveState(
+		not_null<Media::Memento*> memento,
+		Media::ListScrollTopState scrollState) override;
+	void restoreState(
+		not_null<Media::Memento*> memento,
+		Fn<void(Media::ListScrollTopState)> restoreScrollState) override;
+
+private:
+	static constexpr auto kMinimalIdsLimit = 16;
+	static constexpr auto kDefaultAroundId = ServerMaxStoryId - 1;
+
+	bool sectionHasFloatingHeader() override;
+	QString sectionTitle(not_null<const Media::BaseLayout*> item) override;
+	bool sectionItemBelongsHere(
+		not_null<const Media::BaseLayout*> item,
+		not_null<const Media::BaseLayout*> previous) override;
+
+	void storyRemoved(not_null<Data::Story*> story);
+	void markLayoutsStale();
+	void clearStaleLayouts();
+	void clear();
+
+	[[nodiscard]] HistoryItem *ensureItem(StoryId id);
+	[[nodiscard]] Media::BaseLayout *getLayout(
+		StoryId id,
+		not_null<Overview::Layout::Delegate*> delegate);
+	[[nodiscard]] std::unique_ptr<Media::BaseLayout> createLayout(
+		StoryId id,
+		not_null<Overview::Layout::Delegate*> delegate);
+
+	const not_null<AbstractController*> _controller;
+	const not_null<PeerData*> _peer;
+	const not_null<History*> _history;
+	const int _albumId = 0;
+	const int _addingToAlbumId = 0;
+
+	StoryId _aroundId = kDefaultAroundId;
+	int _idsLimit = kMinimalIdsLimit;
+	Data::StoriesIdsSlice _slice;
+
+	base::flat_map<StoryId, std::shared_ptr<HistoryItem>> _items;
+	std::unordered_map<StoryId, Media::CachedItem> _layouts;
+	rpl::event_stream<not_null<Media::BaseLayout*>> _layoutRemoved;
+	rpl::event_stream<> _refreshed;
+
+	bool _started = false;
+
+	rpl::lifetime _lifetime;
+	rpl::lifetime _viewerLifetime;
+
+};
+
+} // namespace Info::Stories