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Файл примера window.h
phonon/capabilities/window.h

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 #ifndef WINDOW_H
 #define WINDOW_H

 #include <QWidget>

 #include <phonon/audiooutput.h>
 #include <phonon/seekslider.h>
 #include <phonon/mediaobject.h>
 #include <phonon/volumeslider.h>
 #include <phonon/backendcapabilities.h>
 #include <phonon/effect.h>
 #include <phonon/effectparameter.h>
 #include <phonon/objectdescriptionmodel.h>
 #include <QList>

 class QAction;
 class QGroupBox;
 class QPushButton;
 class QLabel;
 class QListWidget;
 class QListView;
 class QTextEdit;
 class QTreeWidget;

 class Window : public QWidget
 {
     Q_OBJECT

 public:
         Window();

 private slots:
     void updateWidgets();

 private:
     void setupUi();
     void setupBackendBox();

     QGroupBox *backendBox;

     QLabel *devicesLabel;
     QLabel *mimeTypesLabel;
     QLabel *effectsLabel;

     QListWidget *mimeListWidget;
     QListView *devicesListView;
     QTreeWidget *effectsTreeWidget;
 };

 #endif