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Telegram/SourceFiles/statistics/view/bar_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/segment_tree.h"
+#include "statistics/statistics_common.h"
+#include "statistics/statistics_types.h"
+#include "statistics/view/abstract_chart_view.h"
+#include "ui/effects/animation_value.h"
+
+namespace Data {
+struct StatisticalChart;
+} // namespace Data
+
+namespace Statistic {
+
+struct Limits;
+
+class BarChartView final : public AbstractChartView {
+public:
+	BarChartView(bool isStack);
+	~BarChartView() 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:
+	void paintChartAndSelected(QPainter &p, const PaintContext &c);
+
+	struct {
+		Limits full;
+		std::vector<ChartValue> ySum;
+		SegmentTree ySumSegmentTree;
+	} _cachedHeightLimits;
+
+	const bool _isStack;
+	DoubleLineRatios _cachedLineRatios; // Non-stack.
+	Limits _lastPaintedXIndices;
+	int _lastSelectedXIndex = -1;
+	float64 _lastSelectedXProgress = 0;
+
+	CachedSelectedPoints _selectedPoints; // Non-stack.
+
+};
+
+} // namespace Statistic