Issue #118: First part of splitting

Pdf4QtLibCore/sources/pdfpainterutils.h

@@ -0,0 +1,62 @@
+//    Copyright (C) 2020-2021 Jakub Melka
+//
+//    This file is part of PDF4QT.
+//
+//    PDF4QT is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    with the written consent of the copyright owner, any later version.
+//
+//    PDF4QT is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDF4QT. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFPAINTERUTILS_H
+#define PDFPAINTERUTILS_H
+
+#include "pdfglobal.h"
+
+#include <QPainter>
+
+namespace pdf
+{
+
+/// RAII wrapper for painter save/restore
+class PDFPainterStateGuard
+{
+public:
+    explicit inline PDFPainterStateGuard(QPainter* painter) :
+        m_painter(painter)
+    {
+        m_painter->save();
+    }
+
+    inline ~PDFPainterStateGuard()
+    {
+        m_painter->restore();
+    }
+
+private:
+    QPainter* m_painter;
+};
+
+class PDF4QTLIBSHARED_EXPORT PDFPainterHelper
+{
+public:
+    /// Draws bubble using painter. Bubble is aligned to the point, colored with color
+    /// and inside bubble, text is being paint. Bubble bounding box is being returned.
+    /// \param painter Painter
+    /// \param point Position of the bubble
+    /// \param color Color of the bubble
+    /// \param text Text inside the bubble
+    /// \param alignment Bubble alignment relative to the bubble position point
+    static QRect drawBubble(QPainter* painter, QPoint point, QColor color, QString text, Qt::Alignment alignment);
+};
+
+}   // namespace pdf
+
+#endif // PDFPAINTERUTILS_H