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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]