C++ (Qt)
QSplitter s;
QPushButton *b1 = new QPushButton("b1", &s), *b2 = new QPushButton("b2", &s);
s.show();

C++ (Qt)
#include <QtGui>
#include <QtCore>
 
#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
#include <QtWidgets/QtWidgets>
#endif
 
class SplitterHandle : public QSplitterHandle
{
public:
    SplitterHandle(Qt::Orientation orientation, QSplitter *parent) : QSplitterHandle(orientation, parent)
    {
        QPushButton *right = new QPushButton(QChar(0x2192), this);
        right->setCursor(Qt::ArrowCursor);
 
        QPushButton *left = new QPushButton(QChar(0x2190), this);
        left->setCursor(Qt::ArrowCursor);
 
        w = new QWidget(this);
        QVBoxLayout *layout = new QVBoxLayout(w);
        layout->addStretch();
        layout->addWidget(right);
        layout->addWidget(left);
        layout->addStretch();
    }
 
    QSize sizeHint() const { return QSize(w->width(), QSplitterHandle::sizeHint().height()); }
 
protected:
    void showEvent(QShowEvent *e) { w->resize(size()); }
 
private:
    QWidget *w;
};
 
class Splitter : public QSplitter
{
public:
    Splitter(Qt::Orientation orientation, QWidget *parent = 0) : QSplitter(orientation, parent) {}
 
protected:
    QSplitterHandle *createHandle() { return new SplitterHandle(orientation(), this); }
};
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    Splitter splitter(Qt::Horizontal);
    QTextEdit *t1 = new QTextEdit(&splitter), *t2 = new QTextEdit(&splitter);
    splitter.show();
 
    return app.exec();
}