qt-creator/doc/examples/textfinder/textfinder.cpp

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#include "textfinder.h"

//! [1]
#include <QtCore/QFile>
#include <QtCore/QTextStream>
//! [1]
#include <QtGui/QMessageBox>

//! [3]
TextFinder::TextFinder(QWidget *parent)
    : QWidget(parent), ui(new Ui::TextFinder)
{
    ui->setupUi(this);
    loadTextFile();
}
//! [3]

TextFinder::~TextFinder()
{
    delete ui;
}

//! [0]
void TextFinder::loadTextFile()
{
    QFile inputFile(":/input.txt");
    inputFile.open(QIODevice::ReadOnly);

    QTextStream in(&inputFile);
    QString line = in.readAll();
    inputFile.close();

    ui->textEdit->setPlainText(line);
    QTextCursor cursor = ui->textEdit->textCursor();
    cursor.movePosition(QTextCursor::Start, QTextCursor::MoveAnchor, 1);
}
//! [0]

//! [2]
void TextFinder::on_findButton_clicked()
{
    QString searchString = ui->lineEdit->text();
    ui->textEdit->find(searchString, QTextDocument::FindWholeWords);
}
//! [2]