Qt 4.3: textfinder.cpp Example File (uitools/textfinder/textfinder.cpp)

|  | Home · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# textfinder.cpp Example File
uitools/textfinder/textfinder.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the documentation of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
    ** License versions 2.0 or 3.0 as published by the Free Software
    ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
    ** included in the packaging of this file.  Alternatively you may (at
    ** your option) use any later version of the GNU General Public
    ** License if such license has been publicly approved by Trolltech ASA
    ** (or its successors, if any) and the KDE Free Qt Foundation. In
    ** addition, as a special exception, Trolltech gives you certain
    ** additional rights. These rights are described in the Trolltech GPL
    ** Exception version 1.2, which can be found at
    ** http://www.trolltech.com/products/qt/gplexception/ and in the file
    ** GPL_EXCEPTION.txt in this package.
    **
    ** Please review the following information to ensure GNU General
    ** Public Licensing requirements will be met:
    ** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
    ** you are unsure which license is appropriate for your use, please
    ** review the following information:
    ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
    ** or contact the sales department at sales@trolltech.com.
    **
    ** In addition, as a special exception, Trolltech, as the sole
    ** copyright holder for Qt Designer, grants users of the Qt/Eclipse
    ** Integration plug-in the right for the Qt/Eclipse Integration to
    ** link to functionality provided by Qt Designer and its related
    ** libraries.
    **
    ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
    ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
    ** granted herein.
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

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

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

         ui_findButton = qFindChild<QPushButton*>(this, "findButton");
         ui_textEdit = qFindChild<QTextEdit*>(this, "textEdit");
         ui_lineEdit = qFindChild<QLineEdit*>(this, "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 == "") {
             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.");
             }
         }
     }