- Qt 5.3
- Qt Multimedia
- Spectrum Example
- mainwidget.h Example File
- Qt 5.3.2 Reference Documentation

# mainwidget.h Example File

spectrum/app/mainwidget.h

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #ifndef MAINWIDGET_H
    #define MAINWIDGET_H

    #include <QAudio>
    #include <QIcon>
    #include <QWidget>

    class Engine;
    class FrequencySpectrum;
    class LevelMeter;
    class ProgressBar;
    class SettingsDialog;
    class Spectrograph;
    class ToneGeneratorDialog;
    class Waveform;

    class QAction;
    class QAudioFormat;
    class QLabel;
    class QMenu;
    class QPushButton;

    /**
     * Main application widget, responsible for connecting the various UI
     * elements to the Engine.
     */
    class MainWidget : public QWidget
    {
        Q_OBJECT

    public:
        explicit MainWidget(QWidget *parent = 0);
        ~MainWidget();

        // QObject
        void timerEvent(QTimerEvent *event);

    public slots:
        void stateChanged(QAudio::Mode mode, QAudio::State state);
        void formatChanged(const QAudioFormat &format);
        void spectrumChanged(qint64 position, qint64 length,
                             const FrequencySpectrum &spectrum);
        void infoMessage(const QString &message, int timeoutMs);
        void errorMessage(const QString &heading, const QString &detail);
        void audioPositionChanged(qint64 position);
        void bufferLengthChanged(qint64 length);

    private slots:
        void showFileDialog();
        void showSettingsDialog();
        void showToneGeneratorDialog();
        void initializeRecord();
        void updateModeMenu();
        void updateButtonStates();

    private:
        void createUi();
        void createMenus();
        void connectUi();
        void reset();

        enum Mode {
            NoMode,
            RecordMode,
            GenerateToneMode,
            LoadFileMode
        };

        void setMode(Mode mode);

    private:
        Mode                    m_mode;

        Engine*                 m_engine;

    #ifndef DISABLE_WAVEFORM
        Waveform*               m_waveform;
    #endif
        ProgressBar*            m_progressBar;
        Spectrograph*           m_spectrograph;
        LevelMeter*             m_levelMeter;

        QPushButton*            m_modeButton;
        QPushButton*            m_recordButton;
        QIcon                   m_recordIcon;
        QPushButton*            m_pauseButton;
        QIcon                   m_pauseIcon;
        QPushButton*            m_playButton;
        QIcon                   m_playIcon;
        QPushButton*            m_settingsButton;
        QIcon                   m_settingsIcon;

        QLabel*                 m_infoMessage;
        int                     m_infoMessageTimerId;

        SettingsDialog*         m_settingsDialog;
        ToneGeneratorDialog*    m_toneGeneratorDialog;

        QMenu*                  m_modeMenu;
        QAction*                m_loadFileAction;
        QAction*                m_generateToneAction;
        QAction*                m_recordAction;
    };

    #endif // MAINWIDGET_H