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Telegram/SourceFiles/statistics/view/linear_chart_view.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 "statistics/statistics_common.h"
+#include "statistics/view/abstract_chart_view.h"
+
+namespace Data {
+struct StatisticalChart;
+} // namespace Data
+
+namespace Statistic {
+
+struct Limits;
+
+class LinearChartView final : public AbstractChartView {
+public:
+	LinearChartView(bool isDouble);
+	~LinearChartView() override final;
+
+	void paint(QPainter &p, const PaintContext &c) override;
+
+	void paintSelectedXIndex(
+		QPainter &p,
+		const PaintContext &c,
+		int selectedXIndex,
+		float64 progress) override;
+
+	int findXIndexByPosition(
+		const Data::StatisticalChart &chartData,
+		const Limits &xPercentageLimits,
+		const QRect &rect,
+		float64 x) override;
+
+	[[nodiscard]] HeightLimits heightLimits(
+		Data::StatisticalChart &chartData,
+		Limits xIndices) override;
+
+private:
+	DoubleLineRatios _cachedLineRatios;
+
+	[[nodiscard]] float64 lineRatio() const;
+
+	struct CacheToken final {
+		explicit CacheToken() = default;
+		explicit CacheToken(
+			Limits xIndices,
+			Limits xPercentageLimits,
+			Limits heightLimits,
+			QSize rectSize)
+		: xIndices(std::move(xIndices))
+		, xPercentageLimits(std::move(xPercentageLimits))
+		, heightLimits(std::move(heightLimits))
+		, rectSize(std::move(rectSize)) {
+		}
+
+		bool operator==(const CacheToken &other) const {
+			return (rectSize == other.rectSize)
+				&& (xIndices.min == other.xIndices.min)
+				&& (xIndices.max == other.xIndices.max)
+				&& (xPercentageLimits.min == other.xPercentageLimits.min)
+				&& (xPercentageLimits.max == other.xPercentageLimits.max)
+				&& (heightLimits.min == other.heightLimits.min)
+				&& (heightLimits.max == other.heightLimits.max);
+		}
+
+		bool operator!=(const CacheToken &other) const {
+			return !(*this == other);
+		}
+
+		Limits xIndices;
+		Limits xPercentageLimits;
+		Limits heightLimits;
+		QSize rectSize;
+	};
+
+	struct Cache final {
+		QImage image;
+		CacheToken lastToken;
+		bool hq = false;
+	};
+
+	base::flat_map<int, Cache> _mainCaches;
+	base::flat_map<int, Cache> _footerCaches;
+
+	CachedSelectedPoints _selectedPoints;
+
+};
+
+} // namespace Statistic