《24小时学通qt编程》 程序4-2

//《24小时学通qt编程》 程序4-2

 

#include
#include 
#include 
#include
#include
#include

 

class MyMainWindow:public QWidget
{
public:
    MyMainWindow();
private:
    QPushButton *b1;
    QPushButton *b2;
    QPushButton *b3;
    QLineEdit  *ledit;

};

MyMainWindow::MyMainWindow()
{
    //Orientation Vertical;
    setGeometry(100,100,300,200);
    b1=new QPushButton("Click here to mark the text",this);
    b1->setGeometry(10,10,300,40);
    b1->setFont(QFont("Times", 18, QFont::Bold));

    b2=new QPushButton("Click here to unmark the text",this);
    b2->setGeometry(10,60,300,40);
    b2->setFont(QFont("Times", 18, QFont::Bold));

    b3=new QPushButton("Click here to remove the text",this);
    b3->setGeometry(10,110,300,40);
    b3->setFont(QFont("Times", 18, QFont::Bold));

    ledit=new QLineEdit("This is a Line of text",this);
    ledit->setGeometry(10,160,300,30);

    connect(b1,SIGNAL(clicked()),ledit,SLOT(selectAll()));
    connect(b2,SIGNAL(clicked()),ledit,SLOT(deselect()));
    connect(b3,SIGNAL(clicked()),ledit,SLOT(clear()));
}

int main(int argc,char **argv)
{
    QApplication  a(argc,argv);
    MyMainWindow   w;
    //a.setMainWidget(&w);
    w.show();
    a.exec();
    return 1;
}