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++ // Copyright (C) 2017 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "textfinder.h"
++
++ #include <QUiLoader>
++
++ #include <QLineEdit>
++ #include <QMessageBox>
++ #include <QPushButton>
++ #include <QTextEdit>
++ #include <QVBoxLayout>
++
++ #include <QFile>
++ #include <QTextStream>
++
++ using namespace Qt::StringLiterals;
++
++ //! [4]
++ static QWidget *loadUiFile(QWidget *parent)
++ {
++ QFile file(u":/forms/textfinder.ui"_s);
++ if (!file.open(QIODevice::ReadOnly))
++ qFatal("Cannot open resource file");
++
++ return QUiLoader().load(&file, parent);
++ }
++ //! [4]
++
++ //! [5]
++ static QString loadTextFile()
++ {
++ QFile inputFile(u":/forms/input.txt"_s);
++ if (!inputFile.open(QIODevice::ReadOnly))
++ qFatal("Cannot open resource file");
++
++ return QTextStream(&inputFile).readAll();
++ }
++ //! [5]
++
++ //! [0]
++ TextFinder::TextFinder(QWidget *parent)
++ : QWidget(parent)
++ {
++ QWidget *formWidget = loadUiFile(this);
++
++ //! [1]
++ ui_findButton = findChild<QPushButton*>("findButton");
++ ui_textEdit = findChild<QTextEdit*>("textEdit");
++ ui_lineEdit = findChild<QLineEdit*>("lineEdit");
++ //! [0] //! [1]
++
++ //! [2]
++ QMetaObject::connectSlotsByName(this);
++ //! [2]
++
++ //! [3a]
++ ui_textEdit->setText(loadTextFile());
++ //! [3a]
++
++ //! [3b]
++ auto *layout = new QVBoxLayout(this);
++ layout->addWidget(formWidget);
++ //! [3b]
++
++ //! [3c]
++ setWindowTitle(tr("Text Finder"));
++ }
++ //! [3c]
++
++ //! [6] //! [7]
++ void TextFinder::on_findButton_clicked()
++ {
++ QString searchString = ui_lineEdit->text();
++ QTextDocument *document = ui_textEdit->document();
++
++ bool found = false;
++
++ // undo previous change (if any)
++ document->undo();
++
++ if (searchString.isEmpty()) {
++ QMessageBox::information(this, tr("Empty Search Field"),
++ tr("The search field is empty. "
++ "Please enter a word and click Find."));
++ } else {
++ QTextCursor highlightCursor(document);
++ QTextCursor cursor(document);
++
++ cursor.beginEditBlock();
++ //! [6]
++
++ QTextCharFormat plainFormat(highlightCursor.charFormat());
++ QTextCharFormat colorFormat = plainFormat;
++ colorFormat.setForeground(Qt::red);
++
++ while (!highlightCursor.isNull() && !highlightCursor.atEnd()) {
++ highlightCursor = document->find(searchString, highlightCursor,
++ QTextDocument::FindWholeWords);
++
++ if (!highlightCursor.isNull()) {
++ found = true;
++ highlightCursor.movePosition(QTextCursor::WordRight,
++ QTextCursor::KeepAnchor);
++ highlightCursor.mergeCharFormat(colorFormat);
++ }
++ }
++
++ //! [8]
++ cursor.endEditBlock();
++ //! [7] //! [9]
++
++ if (found == false) {
++ QMessageBox::information(this, tr("Word Not Found"),
++ tr("Sorry, the word cannot be found."));
++ }
++ }
++ }
++ //! [8] //! [9]