textfinder.cpp Example File | Qt UI Tools 5.4

- Qt 5.4
- Qt UI Tools
- Text Finder Example
- textfinder.cpp Example File
- Qt 5.4.2 Reference Documentation

# textfinder.cpp Example File

textfinder/textfinder.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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    ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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    ****************************************************************************/

    #include <QtUiTools>
    #include <QtWidgets>
    #include "textfinder.h"

    TextFinder::TextFinder(QWidget *parent)
        : QWidget(parent)
    {
        QWidget *formWidget = loadUiFile();

        ui_findButton = findChild<QPushButton*>("findButton");
        ui_textEdit = findChild<QTextEdit*>("textEdit");
        ui_lineEdit = findChild<QLineEdit*>("lineEdit");

        QMetaObject::connectSlotsByName(this);

        loadTextFile();

        QVBoxLayout *layout = new QVBoxLayout;
        layout->addWidget(formWidget);
        setLayout(layout);

        setWindowTitle(tr("Text Finder"));
        isFirstTime = true;
    }

    QWidget* TextFinder::loadUiFile()
    {
        QUiLoader loader;

        QFile file(":/forms/textfinder.ui");
        file.open(QFile::ReadOnly);

        QWidget *formWidget = loader.load(&file, this);
        file.close();

        return formWidget;
    }

    void TextFinder::loadTextFile()
    {
        QFile inputFile(":/forms/input.txt");
        inputFile.open(QIODevice::ReadOnly);
        QTextStream in(&inputFile);
        QString line = in.readAll();
        inputFile.close();

        ui_textEdit->append(line);
        ui_textEdit->setUndoRedoEnabled(false);
        ui_textEdit->setUndoRedoEnabled(true);
    }

    void TextFinder::on_findButton_clicked()
    {
        QString searchString = ui_lineEdit->text();
        QTextDocument *document = ui_textEdit->document();

        bool found = false;

        if (isFirstTime == false)
            document->undo();

        if (searchString.isEmpty()) {
            QMessageBox::information(this, tr("Empty Search Field"),
                    "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();
            isFirstTime = false;

            if (found == false) {
                QMessageBox::information(this, tr("Word Not Found"),
                    "Sorry, the word cannot be found.");
            }
        }
    }