Creating a drum track

Let's buckle up and do this project! Create a newQt Widgets Application project named ch11-drum-machine. As usual, add the CONFIG += c++14 in ch11-drum-machine.pro.

Now, create a new C++ class named SoundEvent. Here is SoundEvent.h stripped of its functions:

#include <QtGlobal> 
 
class SoundEvent 
{ 
 
public: 
    SoundEvent(qint64 timestamp = 0, int soundId = 0); 
    ~SoundEvent(); 
 
    qint64 timestamp; 
    int soundId; 
}; 

This class contains only two public members:

• timestamp: A qint64 (of the long long type) that contains the current time of the SoundEvent in milliseconds since the beginning of the track
• soundId: The ID of the sound that has been played

In recording mode, each time the user plays a sound, a SoundEvent is created with the appropriate data. The content of the SoundEvent.cpp file is so boring that we will not inflict it on you.

The next class to build is Track. Again, create the new C++ class. Let's look at Track.h with its members only:

#include...