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

// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "textfinder.h"

//! [1]
#include "./ui_textfinder.h"
#include <QFile>
#include <QTextStream>
//! [1]

//! [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]