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本例子涉及到了快捷键，信号，槽，读者自己看代码，我给出了框架。

find.h文件代码如下：

                         
#ifndef FIND_H
#define FIND_H
#include <QtGui>
#include "ui_find.h"
class
Find : 
public
QDialog
{ 
    
Q_OBJECT
public
:
    
Find(QWidget *parent = 0, Qt::WFlags flags = 0);
    
~Find();
signals:
    
void
findNext1(
const
QString &str,Qt::CaseSensitivity cs);
    
void
findPrevious1(
const
QString &str,Qt::CaseSensitivity cs);
private
slots:
    
void
findClicked();
    
void
enableFindButton(
const
QString &str);
private
:
    
Ui::FindClass ui;
    
QLabel *label;
    
QLineEdit *textLine;
    
QCheckBox *matchBox;
    
QCheckBox *searchBox;
    
QPushButton *findButton;
    
QPushButton *quitButton;
};
#endif // FIND_H
        
      

find.cpp代码如下：

                         
#include "find.h"
Find::Find(QWidget *parent, Qt::WFlags flags)
    
: QDialog(parent, flags)
{ 
    
ui.setupUi(
this
);
    
label=
new
QLabel(tr(
"Find &What:"
));
    
textLine=
new
QLineEdit();
    
label->setBuddy(textLine);
    
QHBoxLayout *hlayout=
new
QHBoxLayout();
    
hlayout->addWidget(label);
    
hlayout->addWidget(textLine);
    
findButton=
new
QPushButton(tr(
"&Find"
));
    
findButton->setEnabled(
false
);
    
findButton->setDefault(
true
);
    
quitButton=
new
QPushButton(tr(
"&Quit"
));
    
QVBoxLayout *vlayout=
new
QVBoxLayout();
    
vlayout->addWidget(findButton);
    
vlayout->addWidget(quitButton);
    
matchBox=
new
QCheckBox(tr(
"Match &Case"
));
    
searchBox=
new
QCheckBox(tr(
"Search &Backword"
));
    
QVBoxLayout *vlayout1=
new
QVBoxLayout();
    
vlayout1->addWidget(matchBox);
    
vlayout1->addWidget(searchBox);
    
QHBoxLayout *mainLayout=
new
QHBoxLayout();
    
mainLayout->addLayout(hlayout);
    
mainLayout->addLayout(vlayout);
    
mainLayout->addLayout(vlayout1);
    
setLayout(mainLayout);
    
setWindowTitle(tr(
"Find"
));
    
setFixedHeight(sizeHint().height());
    
connect(textLine,SIGNAL(textChanged(
const
QString &)),
this
,SLOT(enableFindButton(
const
QString&)));
    
connect(findButton,SIGNAL(clicked()),
this
,SLOT(findClicked()));
    
connect(quitButton,SIGNAL(clicked()),
this
,SLOT(close()));
}
Find::~Find()
{ 
}
// void Find::findNext1(const QString &str,Qt::CaseSensitivity cs){ 
//     //do something here
// }
//
// void Find::findPrevious1(const QString &str,Qt::CaseSensitivity){ 
//            //do something here
// }
void
Find::findClicked(){ 
    
QString text=textLine->text();
    
Qt::CaseSensitivity cs=matchBox->isChecked() ? Qt::CaseSensitive:Qt::CaseInsensitive;
    
if
(searchBox->isChecked()){ 
        
emit findPrevious1(text,cs);
    
}
else
{ 
        
emit findNext1(text,cs);
    
}
}
void
Find::enableFindButton(
const
QString &str){ 
    
findButton->setEnabled(!(str.isEmpty()));
}
        
      

main.cpp

                         
#include "find.h"
#include <QtGui/QApplication>
int
main(
int
argc, 
char
*argv[])
{ 
    
QApplication a(argc, argv);
    
Find w=
new
Find();
    
w.show();
    
return
a.exec();
}
        
      