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+/****************************************************************************
+**
+** Copyright (C) 2012 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;
+
+QT_BEGIN_NAMESPACE
+class QAction;
+class QAudioFormat;
+class QLabel;
+class QMenu;
+class QPushButton;
+QT_END_NAMESPACE
+
+/**
+ * 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