CpuWidget using QCharts

Now that the base class SysInfoWidget is ready, let's implement its first child class: CpuWidget. We will now use the Qt Charts API to display a good-looking widget. The average CPU load will be displayed in a pie graph with a hole in the center, like a partly eaten donut where the eaten part is the percentage of the CPU used. The first step is to add a new C++ class named CpuWidget and make it inherit SysInfoWidget:

#include "SysInfoWidget.h" 
class CpuWidget : public SysInfoWidget 
    explicit CpuWidget(QWidget* parent = 0); 

In the constructor, the only parameter needed is a QWidget* parent. Since we provided default values for the startDelayMs and updateSeriesDelayMs variables in SysInfoWidget class, we ...

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