Making your thumbnails jump

Let's apply what we learned about the Qt Animation Framework to our project. Each time the user clicks on a filter thumbnail, we want to poke it. All modifications will be done on the FilterWidget class. Let's start with FilterWidget.h:

#include <QPropertyAnimation> 
 
class FilterWidget : public QWidget 
{ 
    Q_OBJECT 
 
public: 
    explicit FilterWidget(Filter& filter, QWidget *parent = 0); 
    ~FilterWidget(); 
    ... 
 
private: 
    void initAnimations(); 
    void startSelectionAnimation(); 
 
private: 
    ... 
    QPropertyAnimation mSelectionAnimation; 
}; 

The first function, initAnimations(), initializes the animations used by FilterWidget. The second function, startSelectionAnimation(), performs tasks required to start this animation correctly. As you can see, we are also declaring a QPropertyAnimation class, as covered in the previous section.

We can now update FilterWidget.cpp. Let's update the constructor:

FilterWidget::FilterWidget...