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Telegram/SourceFiles/statistics/view/abstract_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
+
+namespace Data {
+struct StatisticalChart;
+} // namespace Data
+
+namespace Statistic {
+
+struct Limits;
+class LinesFilterController;
+
+struct PaintContext final {
+	const Data::StatisticalChart &chartData;
+	const Limits xIndices;
+	const Limits xPercentageLimits;
+	const Limits heightLimits;
+	const QRect ▭
+	bool footer = false;
+};
+
+struct CachedSelectedPoints final {
+	[[nodiscard]] bool isSame(int x, const PaintContext &c) const;
+
+	int lastXIndex = -1;
+	Limits lastHeightLimits;
+	Limits lastXLimits;
+	base::flat_map<int, QPointF> points;
+};
+
+class DoubleLineRatios final : std::pair<float64, float64> {
+public:
+	DoubleLineRatios(bool isDouble);
+
+	operator bool() const {
+		return first > 0;
+	}
+
+	void init(const Data::StatisticalChart &chartData);
+	[[nodiscard]] float64 ratio(int lineId) const;
+};
+
+class AbstractChartView {
+public:
+	virtual ~AbstractChartView() = default;
+
+	virtual void paint(QPainter &p, const PaintContext &c) = 0;
+
+	virtual void paintSelectedXIndex(
+		QPainter &p,
+		const PaintContext &c,
+		int selectedXIndex,
+		float64 progress) = 0;
+
+	[[nodiscard]] virtual int findXIndexByPosition(
+		const Data::StatisticalChart &chartData,
+		const Limits &xPercentageLimits,
+		const QRect &rect,
+		float64 x) = 0;
+
+	struct HeightLimits final {
+		Limits full;
+		Limits ranged;
+	};
+
+	[[nodiscard]] virtual HeightLimits heightLimits(
+		Data::StatisticalChart &chartData,
+		Limits xIndices) = 0;
+
+	struct LocalZoomResult final {
+		bool hasZoom = false;
+		Limits limitIndices;
+		Limits range;
+	};
+
+	struct LocalZoomArgs final {
+		enum class Type {
+			Prepare,
+			SkipCalculation,
+			CheckAvailability,
+			Process,
+			SaveZoomFromFooter,
+		};
+		const Data::StatisticalChart &chartData;
+		Type type;
+		float64 progress = 0.;
+		int xIndex = 0;
+	};
+
+	virtual LocalZoomResult maybeLocalZoom(const LocalZoomArgs &args) {
+		return {};
+	}
+
+	virtual void handleMouseMove(
+		const Data::StatisticalChart &chartData,
+		const QRect &rect,
+		const QPoint &p) {
+	}
+
+	void setUpdateCallback(Fn<void()> callback);
+	void update();
+
+	void setLinesFilterController(std::shared_ptr<LinesFilterController> c);
+
+protected:
+	using LinesFilterControllerPtr = std::shared_ptr<LinesFilterController>;
+	[[nodiscard]] LinesFilterControllerPtr linesFilterController() const;
+
+private:
+	LinesFilterControllerPtr _linesFilterController;
+	Fn<void()> _updateCallback;
+
+};
+
+AbstractChartView::HeightLimits DefaultHeightLimits(
+	const DoubleLineRatios &ratios,
+	const std::shared_ptr<LinesFilterController> &linesFilter,
+	Data::StatisticalChart &chartData,
+	Limits xIndices);
+
+} // namespace Statistic