Let's explore the public slot, triggerPlayButton(), in the SoundEffectWidget class:

//SoundEffectWidget.h 
class SoundEffectWidget : public QWidget 
{ 
... 
public slots: 
    void triggerPlayButton(); 
    ... 
 
private: 
    QPushButton* mPlayButton; 
    ... 
}; 
 
//SoundEffectWidget.cpp 
void SoundEffectWidget::triggerPlayButton() 
{ 
   mPlayButton->animateClick(); 
} 

This widget has a QPushButton called mPlayButton. The triggerPlayButton() slot calls the QPushButton::animateClick() function, which simulates a click on the button over 100 ms by default. All signals will be sent as a real click does. The button really appears to be down. If you do not want the animation you can call QPushButton::click().

Let's see now how to trigger this slot with a key. Each SoundEffectWidget has a Qt:Key:

//SoundEffectWidget.h 
class SoundEffectWidget : public QWidget 
{ 
... 
public: 
    Qt::Key triggerKey() const; 
    void setTriggerKey(const Qt::Key&amp...