OverViewWidget.h

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/***************************************************************************
       OverViewWidget.h  -  horizontal slider with overview over a signal
                             -------------------
    begin                : Tue Oct 21 2000
    copyright            : (C) 2000 by Thomas Eschenbacher
    email                : Thomas.Eschenbacher@gmx.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef OVER_VIEW_WIDGET_H
#define OVER_VIEW_WIDGET_H

#include "config.h"

#include <QtGlobal>
#include <QBitmap>
#include <QColor>
#include <QSize>
#include <QThread>
#include <QTimer>
#include <QWidget>

#include "libkwave/LabelList.h"
#include "libkwave/MetaDataList.h"

#include "libgui/ImageView.h"
#include "libgui/OverViewCache.h"

class QMouseEvent;
class QPainter;
class QResizeEvent;

namespace Kwave
{

    class SignalManager;
    class Track;

    class Q_DECL_EXPORT OverViewWidget: public Kwave::ImageView
    {
        Q_OBJECT
    public:
        explicit OverViewWidget(Kwave::SignalManager &signal,
                                QWidget *parent = Q_NULLPTR);

        virtual ~OverViewWidget() Q_DECL_OVERRIDE;

        virtual QSize minimumSize() const;

        virtual QSize sizeHint() const Q_DECL_OVERRIDE;

    public slots:

        void setRange(sample_index_t offset, sample_index_t viewport,
                      sample_index_t total);

        void setSelection(sample_index_t offset, sample_index_t length);

        void metaDataChanged(Kwave::MetaDataList meta);

        void showCursor(sample_index_t pos = SAMPLE_INDEX_MAX);

    protected:

        virtual void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;

        virtual void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;

        virtual void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;

        virtual void mouseDoubleClickEvent(QMouseEvent *e) Q_DECL_OVERRIDE;

    protected slots:

        void refreshBitmap();

        void overviewChanged();

    signals:

        void valueChanged(sample_index_t new_value);

        void sigCommand(const QString &command);

        void newImage(QImage image);

    protected:

        sample_index_t pixels2offset(int pixels);

        void drawMark(QPainter &p, int x, int height, QColor color);

    private:

        void calculateBitmap();

    private:

        class WorkerThread: public QThread
        {
        public:
            explicit WorkerThread(Kwave::OverViewWidget *widget);

            virtual ~WorkerThread() Q_DECL_OVERRIDE;

            virtual void run() Q_DECL_OVERRIDE;

        private:

            Kwave::OverViewWidget *m_overview;
        };

    private:

        sample_index_t m_view_offset;

        sample_index_t m_view_width;

        sample_index_t m_signal_length;

        sample_index_t m_selection_start;

        sample_index_t m_selection_length;

        sample_index_t m_cursor_position;

        sample_index_t m_last_offset;

        Kwave::OverViewCache m_cache;

        QTimer m_repaint_timer;

        Kwave::LabelList m_labels;

        WorkerThread m_worker_thread;

    };
}

#endif // _OVER_VIEW_WIDGET_H_

//***************************************************************************
//***************************************************************************