c++ gui qt4 chap02 gotocell

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<gotocelldialog.h>#ifndef GOTOCELLDIALOG_H#define GOTOCELLDIALOG_H#include <QDialog>#include "ui_gotocelldialog.h"class GoToCellDialog : public QDialog, public Ui::GoToCellDialog{    Q_OBJECTpublic:    GoToCellDialog(QWidget *parent = 0);private slots:    void on_lineEdit_textChanged();};#endif

<gotocelldialog.cpp>#include <QtGui>#include "gotocelldialog.h"GoToCellDialog::GoToCellDialog(QWidget *parent)    : QDialog(parent){    setupUi(this);    QRegExp regExp("[A-Za-z][1-9][0-9]{0,2}");    lineEdit->setValidator(new QRegExpValidator(regExp, this));    connect(okButton, SIGNAL(clicked()), this, SLOT(accept()));    connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));}void GoToCellDialog::on_lineEdit_textChanged(){    okButton->setEnabled(lineEdit->hasAcceptableInput());}

<gotocelldialog.ui><?xml version="1.0" encoding="UTF-8"?><ui version="4.0"> <class>GoToCellDialog</class> <widget class="QWidget" name="GoToCellDialog">  <property name="geometry">   <rect>    <x>0</x>    <y>0</y>    <width>243</width>    <height>71</height>   </rect>  </property>  <property name="windowTitle">   <string>Go To Cell</string>  </property>  <layout class="QVBoxLayout" name="verticalLayout">   <item>    <layout class="QHBoxLayout" name="horizontalLayout">     <item>      <widget class="QLabel" name="label">       <property name="text">        <string>&Cell Location:</string>       </property>       <property name="buddy">        <cstring>lineEdit</cstring>       </property>      </widget>     </item>     <item>      <widget class="QLineEdit" name="lineEdit"/>     </item>    </layout>   </item>   <item>    <layout class="QHBoxLayout" name="horizontalLayout_2">     <item>      <spacer name="horizontalSpacer">       <property name="orientation">        <enum>Qt::Horizontal</enum>       </property>       <property name="sizeHint" stdset="0">        <size>         <width>40</width>         <height>20</height>        </size>       </property>      </spacer>     </item>     <item>      <widget class="QPushButton" name="okButton">       <property name="enabled">        <bool>false</bool>       </property>       <property name="text">        <string>OK</string>       </property>       <property name="default">        <bool>true</bool>       </property>      </widget>     </item>     <item>      <widget class="QPushButton" name="cancelButton">       <property name="text">        <string>Cancel</string>       </property>      </widget>     </item>    </layout>   </item>  </layout> </widget> <tabstops>  <tabstop>lineEdit</tabstop>  <tabstop>okButton</tabstop>  <tabstop>cancelButton</tabstop> </tabstops> <resources/> <connections/></ui>

<main.cpp>#include <QApplication>#include "gotocelldialog.h"int main(int argc, char *argv[]){    QApplication app(argc, argv);    GoToCellDialog *dialog = new GoToCellDialog;    dialog->show();    return app.exec();}

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