textfinder.cpp Example File

textfinder/textfinder.cpp
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#include "textfinder.h" #include <QFile> #include <QLineEdit> #include <QMessageBox> #include <QPushButton> #include <QTextEdit> #include <QTextStream> #include <QUiLoader> #include <QVBoxLayout> static QWidget *loadUiFile(QWidget *parent) { QFile file(":/forms/textfinder.ui"); file.open(QIODevice::ReadOnly); QUiLoader loader; return loader.load(&file, parent); } static QString loadTextFile() { QFile inputFile(":/forms/input.txt"); inputFile.open(QIODevice::ReadOnly); QTextStream in(&inputFile); in.setCodec("UTF-8"); return in.readAll(); } TextFinder::TextFinder(QWidget *parent) : QWidget(parent) { QWidget *formWidget = loadUiFile(this); ui_findButton = findChild<QPushButton*>("findButton"); ui_textEdit = findChild<QTextEdit*>("textEdit"); ui_lineEdit = findChild<QLineEdit*>("lineEdit"); QMetaObject::connectSlotsByName(this); ui_textEdit->setText(loadTextFile()); QVBoxLayout *layout = new QVBoxLayout; layout->addWidget(formWidget); setLayout(layout); setWindowTitle(tr("Text Finder")); } 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(); 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); } } cursor.endEditBlock(); if (found == false) { QMessageBox::information(this, tr("Word Not Found"), tr("Sorry, the word cannot be found.")); } } }