Some basic action functionality for application DocPage Organizer

Pdf4QtLib/sources/pdfpainterutils.cpp

@@ -0,0 +1,63 @@
+//    Copyright (C) 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/>.
+
+#include "pdfpainterutils.h"
+
+#include <QFontMetrics>
+
+namespace pdf
+{
+
+QRect PDFPainterHelper::drawBubble(QPainter* painter, QPoint point, QColor color, QString text, Qt::Alignment alignment)
+{
+    QFontMetrics fontMetrics = painter->fontMetrics();
+
+    const int lineSpacing = fontMetrics.lineSpacing();
+    const int bubbleHeight = lineSpacing* 2;
+    const int bubbleWidth = lineSpacing + fontMetrics.horizontalAdvance(text);
+
+    QRect rectangle(point, QSize(bubbleWidth, bubbleHeight));
+
+    if (alignment.testFlag(Qt::AlignVCenter))
+    {
+        rectangle.translate(0, -rectangle.height() / 2);
+    }
+    else if (alignment.testFlag(Qt::AlignTop))
+    {
+        rectangle.translate(0, -rectangle.height());
+    }
+
+    if (alignment.testFlag(Qt::AlignHCenter))
+    {
+        rectangle.translate(-rectangle.width() / 2, 0);
+    }
+    else if (alignment.testFlag(Qt::AlignLeft))
+    {
+        rectangle.translate(-rectangle.width(), 0);
+    }
+
+    PDFPainterStateGuard guard(painter);
+    painter->setPen(Qt::NoPen);
+    painter->setBrush(QBrush(color));
+    painter->drawRoundedRect(rectangle, rectangle.height() / 2, rectangle.height() / 2, Qt::AbsoluteSize);
+    painter->setPen(Qt::black);
+    painter->drawText(rectangle, Qt::AlignCenter, text);
+
+    return rectangle;
+}
+
+}   // namespace pdf

Pdf4QtLib/sources/pdfpainterutils.h

@@ -18,6 +18,8 @@
 #ifndef PDFPAINTERUTILS_H
 #define PDFPAINTERUTILS_H
 
+#include "pdfglobal.h"
+
 #include <QPainter>
 
 namespace pdf
@@ -42,6 +44,19 @@ 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