popup.hpp

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/*
 * 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef PULSEVIEW_PV_WIDGETS_POPUP_HPP
#define PULSEVIEW_PV_WIDGETS_POPUP_HPP

#include <QScrollArea>
#include <QWidget>

namespace pv {
namespace widgets {


// A regular QScrollArea has a fixed size and provides scroll bars when the
// content can't be shown in its entirety. However, we want no horizontal
// scroll bar and want the scroll area to adjust its width to fit the content
// instead.
// Inspired by https://stackoverflow.com/questions/21253755/qscrollarea-with-dynamically-changing-contents?answertab=votes#tab-top
class QWidthAdjustingScrollArea : public QScrollArea
{
    Q_OBJECT

public:
    QWidthAdjustingScrollArea(QWidget* parent = nullptr);
    void setWidget(QWidget* w);
    bool eventFilter(QObject* obj, QEvent* ev);
};


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 *event);

    virtual 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 *event);

protected:
    void showEvent(QShowEvent *);

Q_SIGNALS:
    void closed();

private:
    QPoint point_;
    Position pos_;
};

} // namespace widgets
} // namespace pv

#endif // PULSEVIEW_PV_WIDGETS_POPUP_HPP