mainwidget.h Example File

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  #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) override;

  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