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    40 ****************************************************************************/

    41 

    42 #include <QtUiTools>

    43 #include <QtGui>

    44 #include "textfinder.h"

    45 

    46 //! [0]

    47 TextFinder::TextFinder(QWidget *parent)

    48     : QWidget(parent)

    49 {

    50     QWidget *formWidget = loadUiFile();

    51 

    52 //! [1]

    53     ui_findButton = qFindChild<QPushButton*>(this, "findButton");

    54     ui_textEdit = qFindChild<QTextEdit*>(this, "textEdit");

    55     ui_lineEdit = qFindChild<QLineEdit*>(this, "lineEdit");

    56 //! [0] //! [1]

    57 

    58 //! [2]

    59     QMetaObject::connectSlotsByName(this);

    60 //! [2]

    61 

    62 //! [3a]

    63     loadTextFile();

    64 //! [3a]

    65 

    66 //! [3b]

    67     QVBoxLayout *layout = new QVBoxLayout;

    68     layout->addWidget(formWidget);

    69     setLayout(layout);

    70 //! [3b]

    71 

    72 //! [3c]

    73     setWindowTitle(tr("Text Finder"));

    74     isFirstTime = true;

    75 }

    76 //! [3c]

    77 

    78 //! [4]

    79 QWidget* TextFinder::loadUiFile()

    80 {

    81     QUiLoader loader;

    82 

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

    84     file.open(QFile::ReadOnly);

    85 

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

    87     file.close();

    88 

    89     return formWidget;

    90 }

    91 //! [4]

    92 

    93 //! [5]

    94 void TextFinder::loadTextFile()

    95 {

    96     QFile inputFile(":/forms/input.txt");

    97     inputFile.open(QIODevice::ReadOnly);

    98     QTextStream in(&inputFile);

    99     QString line = in.readAll();

   100     inputFile.close();

   101 

   102     ui_textEdit->append(line);

   103     ui_textEdit->setUndoRedoEnabled(false);

   104     ui_textEdit->setUndoRedoEnabled(true);

   105 }

   106 //! [5]

   107 

   108 //! [6] //! [7]

   109 void TextFinder::on_findButton_clicked()

   110 {

   111     QString searchString = ui_lineEdit->text();

   112     QTextDocument *document = ui_textEdit->document();

   113 

   114     bool found = false;

   115 

   116     if (isFirstTime == false)

   117         document->undo();

   118 

   119     if (searchString == "") {

   120         QMessageBox::information(this, tr("Empty Search Field"),

   121                 "The search field is empty. Please enter a word and click Find.");

   122     } else {

   123 

   124         QTextCursor highlightCursor(document);  

   125         QTextCursor cursor(document);

   126         

   127         cursor.beginEditBlock();

   128 //! [6]

   129 

   130         QTextCharFormat plainFormat(highlightCursor.charFormat());

   131         QTextCharFormat colorFormat = plainFormat;

   132         colorFormat.setForeground(Qt::red);

   133 

   134         while (!highlightCursor.isNull() && !highlightCursor.atEnd()) {

   135             highlightCursor = document->find(searchString, highlightCursor, QTextDocument::FindWholeWords);

   136 

   137             if (!highlightCursor.isNull()) {

   138                 found = true;

   139                 highlightCursor.movePosition(QTextCursor::WordRight,

   140                                        QTextCursor::KeepAnchor);

   141                 highlightCursor.mergeCharFormat(colorFormat);

   142             }

   143         }

   144 

   145 //! [8]

   146         cursor.endEditBlock();

   147 //! [7] //! [9]

   148         isFirstTime = false;

   149 

   150         if (found == false) {

   151             QMessageBox::information(this, tr("Word Not Found"),

   152                 "Sorry, the word cannot be found.");

   153         }    

   154     }

   155 }

   156 //! [8] //! [9]