Audio Volume Key Event On Symbian/bg

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Български English

Прихващане на събития, свързани с бутон за звук на Symbian устройства

В QML за Symbian устройста събитията за бутона за звук не могат да бъдат прихванати чрез Keys.onVolumeDownPressed, Keys.onVolumeUpPressed, or Keys.onPressed. Подходящо решение на този проблем е създаване на клас, обвиващ S60 Remote Control API чрез наследяване на MRemConCoreApiTargetObserver. Този примерен код, който показва как това може да бъде направено при създаване на QML/C++ приложение. Аналогично може да бъде създаден и QML plugin.

Създайте нов QML елемент, които да обработва събития, свързани с бутоните за звук. Всъщност чрез S60 Remote Control API могат да бъдат прихващани и други събития свързвани с бутоните за медия. За подробности вижте линка по-горе.

MediakeyCaptureItem.h

#ifndef MediakeyCaptureItem_H
#define MediakeyCaptureItem_H

#include <QDeclarativeItem>

#ifdef Q_WS_S60
#include <remconcoreapitargetobserver.h> // link against RemConCoreApi.lib
#include <remconcoreapitarget.h> // and
#include <remconinterfaceselector.h> // RemConInterfaceBase.lib

class MediakeyCaptureItemPrivate;
class MediakeyCaptureItem : public QDeclarativeItem
{
 Q_OBJECT
public:
 MediakeyCaptureItem(QDeclarativeItem *parent = 0);
 void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);

signals:
 void volumeDownPressed();
 void volumeUpPressed();

private:
 MediakeyCaptureItemPrivate *d_ptr;
private: // Friend class definitions
 friend class MediakeyCaptureItemPrivate;
};

#endif // Q_WS_S60
#endif // MediakeyCaptureItem_H

MediakeyCaptureItem.cpp

#include "MediaKeyCaptureItem.h"
#ifdef Q_WS_S60

// A private class to access Symbian RemCon API
class MediakeyCaptureItemPrivate : public QObject, public MRemConCoreApiTargetObserver
{
public:
 MediakeyCaptureItemPrivate(MediakeyCaptureItem '''parent);
 ~MediakeyCaptureItemPrivate();
 virtual void MrccatoCommand(TRemConCoreApiOperationId aOperationId,
 TRemConCoreApiButtonAction aButtonAct);
private:
 CRemConInterfaceSelector''' iInterfaceSelector;
 CRemConCoreApiTarget* iCoreTarget;
 MediakeyCaptureItem *d_ptr;
};

// Consructor
MediakeyCaptureItem::MediakeyCaptureItem(QDeclarativeItem *parent): QDeclarativeItem(parent)
{
 d_ptr = new MediakeyCaptureItemPrivate(this);
}

// The paint method
void MediakeyCaptureItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
 // This item has no visual
}

// Constructor
MediakeyCaptureItemPrivate::MediakeyCaptureItemPrivate(MediakeyCaptureItem *parent): d_ptr(parent)
{
 QT_TRAP_THROWING(iInterfaceSelector = CRemConInterfaceSelector::NewL());
 QT_TRAP_THROWING(iCoreTarget = CRemConCoreApiTarget::NewL(*iInterfaceSelector, '''this));
 iInterfaceSelector->OpenTargetL();
}

// Destructor
MediakeyCaptureItemPrivate::~MediakeyCaptureItemPrivate(){
 delete iInterfaceSelector;
 delete iCoreTarget;
}

// Callback when media keys are pressed
void MediakeyCaptureItemPrivate::MrccatoCommand(TRemConCoreApiOperationId aOperationId,
 TRemConCoreApiButtonAction aButtonAct)
{
 //TRequestStatus status;
 switch( aOperationId )
 {
 case ERemConCoreApiVolumeUp:
 emit d_ptr->volumeUpPressed();
 break;
 case ERemConCoreApiVolumeDown:
 emit d_ptr->volumeDownPressed();
 break;
 default:
 break;
 }
}
#endif // Q_WS_S60

В C++ кода направете регистрация:

qmlRegisterType<MediakeyCaptureItem>("Mediakey", 1, 0, "MediakeyCapture");

Необходимо е да добавите следните няколко реда във .pro файла на вашия проект:

symbian{
 INCLUDEPATH ''= MW_LAYER_SYSTEMINCLUDE // Not sure if this is needed…
 LIBS''= -L\epoc32\release\armv5\lib -lremconcoreapi
 LIBS += -L\epoc32\release\armv5\lib -lremconinterfacebase
}


В QML слушайте за сигнали по следния начин:

import Qt 4.7
import Mediakey 1.0
Item{

 

 MediakeyCapture{
 onVolumeDownPressed: console.log('VOLUME DOWN PRESSED ')
 onVolumeUpPressed: console.log('VOLUME UP PRESSED ')
 }
}

Отстраняване на проблеми

Ако използвате Qt SDK 1.1 (Windows, Beta and RC) за Symbian^3 е необходимо да копирате всичко от

C:3Qt472\epoc32\release\armv5\lib\rem'''

в

C:1Qt472\epoc32\release\armv5\lib