statistics: add a model that describes a list of charts

Qt's comboboxes are controlled by models, there's no way around
that. To customize the chart-selection widget this must therefore
be abstracted into a model. On the upside, this hopefully can
be used for desktop and mobile.

The model provides icons and paints a warning-symbol on it
if the statistics core code deems the chart to be not recommended.
Notably, when plotting a categorical bar chart against a
numerical value (in such a case histograms are preferred).

Includes a fix for a silly oversight in CMakelist.txt: add the
statstranslations.h header.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

1 files changed, 54 insertions, 0 deletions

diff --git a/stats/chartlistmodel.h b/stats/chartlistmodel.h
new file mode 100644
index 000000000..a33f6875a
--- /dev/null
+++ b/stats/chartlistmodel.h
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+// A model to feed to the chart-selection combobox
+#ifndef CHART_LIST_MODEL_H
+#define CHART_LIST_MODEL_H
+
+#include "statsstate.h"
+#include <vector>
+#include <QAbstractListModel>
+#include <QString>
+#include <QFont>
+#include <QIcon>
+#include <QPixmap>
+
+class ChartListModel : public QAbstractListModel {
+	Q_OBJECT
+public:
+	ChartListModel();
+	~ChartListModel();
+
+	// Returns index of selected item
+	int update(const StatsState::ChartList &charts);
+
+	static const constexpr int ChartNameRole = Qt::UserRole + 1;
+	static const constexpr int IsHeaderRole = Qt::UserRole + 2;
+	static const constexpr int IconRole = Qt::UserRole + 3;
+	static const constexpr int IconSizeRole = Qt::UserRole + 4;
+private:
+	struct Item {
+		bool isHeader;
+		QString name;
+		QString fullName;
+		ChartSubType subtype;
+		int id;
+		bool warning;
+	};
+
+	struct SubTypeIcons {
+		QPixmap normal;
+		QPixmap warning;
+	};
+	QPixmap warningPixmap;
+	SubTypeIcons subTypeIcons[(size_t)ChartSubType::Count];
+
+	QFont itemFont;
+	QFont headerFont;
+	std::vector<Item> items;
+	int rowCount(const QModelIndex &parent) const override;
+	QVariant data(const QModelIndex &index, int role) const override;
+	Qt::ItemFlags flags(const QModelIndex &index) const override;
+	void initIcon(ChartSubType type, const char *name, int iconSize);
+	const QPixmap &getIcon(ChartSubType type, bool warning) const;
+};
+
+#endif