QT Basic---Widgets<1>

QLabel ------------------------------------------------------------------------

//#include"mainwindow.h"

#include<QApplication>

#include<QLabel>

intmain(intargc,char*argv[])

{

QApplicationapp(argc,argv);

//MainWindoww;

//w.show();

QLabel*label=newQLabel("helloQT");

QLabel*label2=newQLabel("<h2><i>hello</i>""<fontcolor=red>QT</font></h2>");

label->show();

label2->show();

returnapp.exec();

}

QPushButton ------------------------------------------------------------------------

#include"mainwindow.h"

#include<QApplication>

#include<QPushButton> //add include file

intmain(intargc,char*argv[])

{

QApplicationa(argc,argv);

//MainWindoww;

//w.show();

QPushButton*button=newQPushButton("Quit");

//add siganl deal
QObject::connect(button,SIGNAL(clicked()),&a,SLOT(quit()));

button->show();

returna.exec();

}

QSpinBox,QSlider ------------------------------------------------------------------------

#include"mainwindow.h"

#include<QApplication>

#include<QSlider>

#include<QSpinBox>

#include<QHBoxLayout>

intmain(intargc,char*argv[])

{

QApplicationa(argc,argv);

//MainWindoww;

//w.show();

QWidget*window=newQWidget();

window->setWindowTitle("EnterYourYear:");

QSpinBox*spinbox=newQSpinBox();

QSlider*slider=newQSlider(Qt::Horizontal);

spinbox->setRange(0,130);

slider->setRange(0,130);

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

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

spinbox->setValue(35);

QHBoxLayout*boxlayout=newQHBoxLayout();

boxlayout->addWidget(spinbox);

boxlayout->addWidget(slider);

window->setLayout(boxlayout);

window->show();

returna.exec();

}