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#ifndef QT_PROGRESS_BAR_CALLBACK_H
#define QT_PROGRESS_BAR_CALLBACK_H
#include <CGAL/Real_timer.h>
#include <QProgressDialog>
#include <QApplication>
class Qt_progress_bar_callback
{
private:
CGAL::Real_timer timer;
double t_start;
mutable double t_latest;
mutable std::size_t nb;
QProgressDialog* dialog;
public:
Qt_progress_bar_callback()
{
}
Qt_progress_bar_callback(const char* title, QWidget* parent)
: dialog (new QProgressDialog (QString(title),
QString("Cancel"),
0, 100,
parent))
{
dialog->setMinimumDuration(0);
dialog->setWindowModality(Qt::WindowModal);
timer.start();
t_start = timer.time();
t_latest = t_start;
}
~Qt_progress_bar_callback()
{
}
bool operator() (double advancement) const
{
// Avoid calling time() at every single iteration, which could
// impact performances very badly
++ nb;
if (advancement != 1 && nb % 1000 != 0)
return true;
// If the limit is reach, interrupt the algorithm
double t = timer.time();
if (advancement == 1 || (t - t_latest) > 0.25)
{
dialog->setValue (int (100. * advancement));
t_latest = t;
if (dialog->wasCanceled())
return false;
}
return true;
}
};
#endif // QT_PROGRESS_BAR_CALLBACK_H
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