#ifndef FINDDIALOG_H#define FINDDIALOG_H#include <QDialog>#include <QLabel>#include <QCheckBox>#include <QLineEdit>#include <QPushButton>#include <QLayout>class FindDialog : public QDialog{    Q_OBJECTpublic:    FindDialog(QWidget * parent = 0);signals:    void findNext(const QString &str, Qt::CaseSensitivity cs);    void findPrevious(const QString &str, Qt::CaseSensitivity cs);private slots:    void findClicked();    void enableFindButton(const QString &text);private:    QLabel * label;    QLineEdit * lineEdit;    QCheckBox * caseCheckBox;    QCheckBox * backwardCheckBox;    QPushButton * findButton;    QPushButton * closeButton;};#endif // FINDDIALOG_H

#include <QtGui>#include "finddialog.h"FindDialog::FindDialog(QWidget *parent):QDialog(parent){    label = new QLabel(tr("Find &what:"));    lineEdit = new QLineEdit;    label->setBuddy(lineEdit);    caseCheckBox = new QCheckBox(tr("Match &case"));    backwardCheckBox = new QCheckBox(tr("Search &backward"));    findButton = new QPushButton(tr("&Find"));    findButton->setDefault(true);    findButton->setEnabled(false);    closeButton = new QPushButton(tr("Close"));    connect(lineEdit, SIGNAL(textChanged(const QString &)),            this, SLOT(enableFindButton(const QString &)));    connect(findButton, SIGNAL(clicked()), this, SLOT(findClicked()));    connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));    QHBoxLayout * topLeftLayout = new QHBoxLayout;    topLeftLayout->addWidget(label);    topLeftLayout->addWidget(lineEdit);    QVBoxLayout * leftLayout = new QVBoxLayout;    leftLayout->addLayout(topLeftLayout);    leftLayout->addWidget(caseCheckBox);    leftLayout->addWidget(backwardCheckBox);    QVBoxLayout * rightLayout = new QVBoxLayout;    rightLayout->addWidget(findButton);    rightLayout->addWidget(closeButton);    rightLayout->addStretch();    QHBoxLayout * mainLayout = new QHBoxLayout;    mainLayout->addLayout(leftLayout);    mainLayout->addLayout(rightLayout);    setLayout(mainLayout);    setWindowTitle(tr("Find"));    setFixedHeight(sizeHint().height());}void FindDialog::findClicked(){    QString text = lineEdit->text();    Qt::CaseSensitivity cs = caseCheckBox->isChecked()?Qt::CaseSensitive                                                     :Qt::CaseInsensitive;    if(backwardCheckBox->isChecked())    {        emit findPrevious(text, cs);    }    else    {        emit findNext(text, cs);    }}void FindDialog::enableFindButton(const QString &text){    findButton->setEnabled(!text.isEmpty());}

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