QT小滑块

主代码：

QWidget *window=new QWidget();
	window->setWindowTitle("hello");
	QSpinBox *spinBox=new QSpinBox();
	QSlider *slider=new QSlider(Qt::Horizontal);
	spinBox->setRange(100,1000);
	slider->setRange(100,1000);
	spinBox->setValue(100);

	QObject::connect(slider,SIGNAL(valueChanged(int)),spinBox,SLOT(setValue(int)));
	QObject::connect(spinBox,SIGNAL(valueChanged(int)),slider,SLOT(setValue(int)));

	QHBoxLayout *layout=new QHBoxLayout();
	layout->addWidget(spinBox);
	layout->addWidget(slider);
	window->setLayout(layout);
	window->show();
	return a.exec();