Refactored printing code from model to base-class

source/PrintableModel/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.6)
+
+project(PrintableModel LANGUAGES CXX)
+
+find_package(Qt5Core REQUIRED)
+find_package(Qt5Widgets REQUIRED)
+
+add_library(${PROJECT_NAME}
+	PrintableModel.cpp
+)
+
+set_target_properties(${PROJECT_NAME}
+	PROPERTIES CXX_STANDARD 14
+)
+
+target_include_directories(${PROJECT_NAME}
+    PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+target_link_libraries(${PROJECT_NAME}
+	PRIVATE
+		Qt5::Core
+		Qt5::Widgets
+)

source/PrintableModel/PrintableModel.cpp

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+#include "PrintableModel.h"
+
+QFont PrintableModel::h1Font()
+{
+	return QFont("Helvetica", 16);
+}
+
+QFont PrintableModel::h2Font()
+{
+	return QFont("Helvetica", 12);
+}
+
+QFont PrintableModel::tableFont()
+{
+	return QFont("Helvetica", 8);
+}
+
+QPen PrintableModel::tablePen()
+{
+	return QPen(Qt::black, 1, Qt::SolidLine);
+}
+
+void PrintableModel::drawTextSquare(QPainter &painter, const QRectF &cell, const QString &text)
+{
+	auto prevPen = painter.pen();
+	painter.setPen(tablePen());
+
+	painter.drawText(cell, Qt::AlignCenter, text);
+
+	painter.drawLine(cell.topLeft(), cell.topRight());
+	painter.drawLine(cell.topRight(), cell.bottomRight());
+	painter.drawLine(cell.bottomRight(), cell.bottomLeft());
+	painter.drawLine(cell.bottomLeft(), cell.topLeft());
+
+	painter.setPen(prevPen);
+}
+
+void PrintableModel::PrintableModel::drawCheckSquare(QPainter &painter, const QRectF &cell,
+                                                     bool checked)
+{
+	drawTextSquare(painter, cell, checked ? "\u2612" : "\u2610");
+}
+
+void PrintableModel::drawResultSquare(QPainter &painter, double y, bool rightCell,
+                                      unsigned int value)
+{
+	auto prevPen = painter.pen();
+	painter.setPen(tablePen());
+
+	double pageWidth = painter.device()->width();
+	double cellWidth = 0.03 * pageWidth;
+	double cellHeight = painter.fontMetrics().lineSpacing();
+	double x = pageWidth - cellWidth - (rightCell ? 0 : 0.04 * pageWidth);
+
+	drawTextSquare(painter, {x, y, cellWidth, cellHeight}, QString::number(value));
+
+	painter.setPen(prevPen);
+}
+
+void PrintableModel::drawGreySquare(QPainter &painter, const QRectF &cell)
+{
+	auto prevBrush = painter.brush();
+	auto prevPen = painter.pen();
+
+	painter.setBrush(QBrush(QColor(224, 224, 224)));
+	painter.setPen(QPen(Qt::NoPen));
+	QPointF points[4] = {cell.topLeft(), cell.topRight(), cell.bottomRight(), cell.bottomLeft()};
+	painter.drawPolygon(points, 4);
+
+	painter.setPen(tablePen());
+	painter.drawLine(cell.topLeft(), cell.topRight());
+	painter.drawLine(cell.topRight(), cell.bottomRight());
+	painter.drawLine(cell.bottomRight(), cell.bottomLeft());
+	painter.drawLine(cell.bottomLeft(), cell.topLeft());
+
+	painter.setBrush(prevBrush);
+	painter.setPen(prevPen);
+}

source/PrintableModel/PrintableModel.h

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+#pragma once
+
+#include <QPainter>
+#include <QFont>
+#include <QPen>
+#include <QRect>
+#include <QString>
+
+class PrintableModel
+{
+public:
+	virtual void printTo(QPainter &painter) const = 0;
+
+protected:
+	static QFont h1Font();
+	static QFont h2Font();
+	static QFont tableFont();
+
+	static QPen tablePen();
+
+	static void drawTextSquare(QPainter &painter, const QRectF &cell, const QString &text);
+	static void drawCheckSquare(QPainter &painter, const QRectF &cell, bool checked);
+	static void drawResultSquare(QPainter &painter, double y, bool rightCell, unsigned int value);
+	static void drawGreySquare(QPainter &painter, const QRectF &cell);
+};