Can QT create a widget and add it to the layout in one line ?

[John Van]

In QT, this usually requires two lines of code, and I think the increase in the number of lines of code makes reading more complex. I used the template method to implement it on one line, but I still need to manually distinguish between controls and layouts. Is there a better implementation method?

#include <QApplication>
#include <QWidget>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QRadioButton>
//#include "RangeSlider.h"

template<class W, class L, class... Args>
W*  NewW(L* l, Args&&... args)
{
    auto w = new W(std::forward<Args>(args)...);
    l->addWidget(w);
    return w;
}
template<class L1, class L0, class... Args>
L1* NewL(L0* l0, Args&&... args)
{
    auto l1 = new L1(std::forward<Args>(args)...);
    l0->addLayout(l1);
    return l1;
}
class SelectZ : public QWidget
{
public:
    SelectZ()
    {
        auto h1 = new QHBoxLayout(this);
        //auto rs = NewW<RangeSlider>(h1, Qt::Vertical, RangeSlider::Option::DoubleHandles, this);
        auto v1 = NewL<QVBoxLayout>(h1, this);
		auto h21 = NewL<QHBoxLayout>(h1, this);
		QRadioButton* radioBtn1 = NewW<QRadioButton>(h21, u8"aaa", this);
		QRadioButton* radioBtn2 = NewW< QRadioButton>(h21, u8"bbb", this);
	}
};

int main(int argc, char* argv[])
{
    QApplication a(argc, argv);
    SelectZ w;
    w.resize(800, 600);
    w.show();
    return a.exec();
}

[Pl45m4]

@John-Van

How about

layout->addWidget(new Widget());

?

I dont think using two lines makes it any more complicated.
And sometimes you dont want to add a widget directy to something