--- /dev/null
+/*
+ * This file is part of the PulseView project.
+ *
+ * Copyright (C) 2013 Joel Holdsworth <joel@airwebreathe.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef PULSEVIEW_PV_WIDGETS_POPUP_H
+#define PULSEVIEW_PV_WIDGETS_POPUP_H
+
+#include <QWidget>
+
+namespace pv {
+namespace widgets {
+
+class Popup : public QWidget
+{
+ Q_OBJECT
+
+public:
+ enum Position
+ {
+ Right,
+ Top,
+ Left,
+ Bottom
+ };
+
+private:
+ static const unsigned int ArrowLength;
+ static const unsigned int ArrowOverlap;
+ static const unsigned int MarginWidth;
+
+public:
+ Popup(QWidget *parent);
+
+ const QPoint& point() const;
+ Position position() const;
+
+ void set_position(const QPoint point, Position pos);
+
+ bool eventFilter(QObject *obj, QEvent *evt);
+
+ void show();
+
+private:
+ bool space_for_arrow() const;
+
+ QPolygon arrow_polygon() const;
+
+ QRegion arrow_region() const;
+
+ QRect bubble_rect() const;
+
+ QRegion bubble_region() const;
+
+ QRegion popup_region() const;
+
+ void reposition_widget();
+
+private:
+ void closeEvent(QCloseEvent*);
+
+ void paintEvent(QPaintEvent*);
+
+ void resizeEvent(QResizeEvent*);
+
+ void mouseReleaseEvent(QMouseEvent *e);
+
+protected:
+ void showEvent(QShowEvent *e);
+
+Q_SIGNALS:
+ void closed();
+
+private:
+ QPoint point_;
+ Position pos_;
+};
+
+} // namespace widgets
+} // namespace pv
+
+#endif // PULSEVIEW_PV_WIDGETS_POPUP_H