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Telegram/SourceFiles/history/history_view_highlight_manager.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/timer.h"
+#include "ui/effects/animations.h"
+
+class HistoryItem;
+
+namespace Data {
+class Session;
+} // namespace Data
+
+namespace Ui {
+struct ChatPaintHighlight;
+} // namespace Ui
+
+namespace HistoryView {
+
+class Element;
+struct SelectedQuote;
+
+class ElementHighlighter final {
+public:
+	using ViewForItem = Fn<Element*(const HistoryItem*)>;
+	using RepaintView = Fn<void(const Element*)>;
+	ElementHighlighter(
+		not_null<Data::Session*> data,
+		ViewForItem viewForItem,
+		RepaintView repaintView);
+
+	void enqueue(const SelectedQuote &quote);
+	void highlight(const SelectedQuote &quote);
+	void clear();
+
+	[[nodiscard]] Ui::ChatPaintHighlight state(
+		not_null<const HistoryItem*> item) const;
+	[[nodiscard]] MsgId latestSingleHighlightedMsgId() const;
+
+private:
+	class AnimationManager final {
+	public:
+		AnimationManager(ElementHighlighter &parent);
+		[[nodiscard]] bool animating() const;
+		[[nodiscard]] Ui::ChatPaintHighlight state() const;
+		void start(bool withTextPart);
+		void cancel();
+
+	private:
+		ElementHighlighter &_parent;
+		Ui::Animations::Simple _simple;
+		std::optional<base::Timer> _timer;
+		bool _withTextPart = false;
+		bool _collapsing = false;
+		bool _collapsed = false;
+		bool _fadingOut = false;
+
+	};
+
+	struct Highlight {
+		FullMsgId itemId;
+		TextSelection part;
+		int todoListId = 0;
+
+		explicit operator bool() const {
+			return itemId.operator bool();
+		}
+		friend inline bool operator==(Highlight, Highlight) = default;
+	};
+
+	[[nodiscard]] Highlight computeHighlight(const SelectedQuote &quote);
+	void highlight(Highlight data);
+	void checkNextHighlight();
+	void repaintHighlightedItem(not_null<const Element*> view);
+	void updateMessage();
+
+	const not_null<Data::Session*> _data;
+	const ViewForItem _viewForItem;
+	const RepaintView _repaintView;
+
+	Highlight _highlighted;
+	FullMsgId _lastHighlightedMessageId;
+	std::deque<Highlight> _queue;
+
+	AnimationManager _animation;
+
+};
+
+} // namespace HistoryView