Provide API that returns toplevel windows in the application in their z-order

On Windows, the following would implement such a function:

QList<QWidget*> zOrderedWindows()
{
QList<QWidget*> orderedWidgets;

if (!QApplication::topLevelWidgets().count())
return orderedWidgets;

HWND first = QApplication::topLevelWidgets().at(0)->winId();
HWND hwnd = first;
while (hwnd)

{ QWidget *widget = QWidget::find(hwnd); if (widget && widget->isVisible()) orderedWidgets.append(widget); hwnd = GetNextWindow(hwnd, GW_HWNDNEXT); }

hwnd = GetNextWindow(first, GW_HWNDPREV);
while (hwnd)

{ QWidget *widget = QWidget::find(hwnd); if (widget && widget->isVisible()) orderedWidgets.prepend(widget); hwnd = GetNextWindow(hwnd, GW_HWNDPREV); }

return orderedWidgets;
}