#ifndef DIALOGO_H
#define DIALOGO_H

#include <QDialog>

class QCheckBox;
class QLabel;
class QLineEdit;
class QPushButton;

class Dialogo : public QDialog{
    Q_OBJECT //Siempre necesario para declarar SIGNALS AND SLOTS

    public:
        Dialogo(QWidget *parent = 0);
        ~Dialogo();

    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 // DIALOGO_H

#include <QtGui>
#include "dialogo.h"

Dialogo::Dialogo(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());
}

Dialogo::~Dialogo(){
    delete this;
}

void Dialogo::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 Dialogo::enableFindButton(const QString &text){
    findButton->setEnabled(!text.isEmpty());
}

#include <QApplication>

#include "dialogo.h"
#include "dialogo.cpp" /*Este paso no aparece en el ejemplo del tutorial, pero crei que solucionaria el error */

int main(int argc, char *argv[]){
    QApplication app(argc, argv);
    Dialogo *dialogo = new Dialogo;
    dialogo->show();
    return app.exec();
}