1 files changed, 36 insertions, 0 deletions
diff --git a/stats/legend.h b/stats/legend.h
new file mode 100644
index 000000000..e6c5af1e0
--- /dev/null
+++ b/stats/legend.h
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+// A legend box, which is shown on the chart.
+#ifndef STATS_LEGEND_H
+#define STATS_LEGEND_H
+
+#include <memory>
+#include <vector>
+#include <QGraphicsRectItem>
+
+class QGraphicsSceneMouseEvent;
+
+class Legend : public QGraphicsRectItem {
+public:
+	Legend(QGraphicsWidget *chart, const std::vector<QString> &names);
+	void hover(QPointF pos);
+	void resize(); // called when the chart size changes.
+private:
+	// Each entry is a text besides a rectangle showing the color
+	struct Entry {
+		std::unique_ptr<QGraphicsRectItem> rect;
+		std::unique_ptr<QGraphicsSimpleTextItem> text;
+		QPointF pos;
+		double width;
+		Entry(const QString &name, int idx, int numBins, QGraphicsItem *parent);
+	};
+	QGraphicsWidget *chart;
+	int displayedItems;
+	double width;
+	double height;
+	int fontHeight;
+	std::vector<Entry> entries;
+	void updatePosition();
+	void hide();
+};
+
+#endif