Qt学习五：控件二：下拉列表框、字体下拉列表框、QSpinBox控件、QScrollBar控件

这是第二波控件

其中qtButton.h中的程序是

#ifndef QTBUTTON_H
#define QTBUTTON_H

#include 
#include "ui_qtbutton.h"

//-------------------------------
#include

#include
#include
#include

#include

#include
#include

//---------------------------


class qtButton : public QMainWindow
{
	Q_OBJECT

public:
	qtButton(QWidget *parent = 0);
	~qtButton();

private:
	Ui::qtButtonClass ui;
	QComboBox *comboBox;

	QFontComboBox *fontComboBox;
	QPushButton *button;
	QLabel *label;

	QSpinBox *spinBox;

	QScrollBar *scrollBar; //滚动条
	QSpinBox *spinBox1;

	private slots:
	void txtButton();

};

#endif // QTBUTTON_H

另外，qtButton.cpp里面的程序如下：

#include "qtbutton.h"


qtButton::qtButton(QWidget *parent)
: QMainWindow(parent)
{
	ui.setupUi(this);
	//------------------ComboBox------
	comboBox = new QComboBox(this);
	comboBox->setGeometry(QRect(50, 50, 120, 25));
	QStringList str;
	str << "Methamatic" << "Chinese" << "Geometry";
	comboBox->addItems(str);
	//----------------------------------

	//----------------QFontComboBox------------
	fontComboBox = new QFontComboBox(this);
	button = new QPushButton(this);
	label = new QLabel(this);


	label->setGeometry(QRect(50, 150, 300, 25));
	button->setText("button");
	button->move(180, 100);//注意button控件的运行方式

	connect(button, SIGNAL(released()), this, SLOT(txtButton()));

	fontComboBox->setGeometry(QRect(50, 100, 120, 25));
	//----------------------------------------

	//-------------QSpinBox-------------------
	spinBox = new QSpinBox(this);
	spinBox->setGeometry(QRect(50, 150, 100, 25));

	spinBox->setRange(0, 200);
	spinBox->setValue(10);
	spinBox->setSuffix("Yan");
	spinBox->setPrefix("$");

	//----------------------------------------------------

	//---------ScrollBar---------------------
	scrollBar = new QScrollBar(this);
	scrollBar->setOrientation(Qt::Horizontal);
	scrollBar->setGeometry(QRect(50, 200, 180, 20));
	scrollBar->setPageStep(10);
	scrollBar->setValue(50);



	spinBox1 = new QSpinBox(this);
	spinBox1->setGeometry(QRect(50, 250, 100, 25));

	//必须把connect放在最下面；
	connect(scrollBar, SIGNAL(valueChanged(int)), spinBox1, SLOT(setValue(int)));
	connect(spinBox1, SIGNAL(valueChanged(int)), scrollBar, SLOT(setValue(int)));




	//---------------------------------------------
}

qtButton::~qtButton()
{

}

void qtButton::txtButton()
{
	label->setText("choose font:" + fontComboBox->currentText());
}

最后运行结果如下：