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#include <QtUiTools>

#include <QtGui>

#include "textfinder.h"

//! [0]

TextFinder::TextFinder(QWidget *parent)

    : QWidget(parent)

{

    QWidget *formWidget = loadUiFile();

//! [1]

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

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

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

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

//! [2]

    QMetaObject::connectSlotsByName(this);

//! [2]

//! [3a]

    loadTextFile();

//! [3a]

//! [3b]

    QVBoxLayout *layout = new QVBoxLayout;

    layout->addWidget(formWidget);

    setLayout(layout);

//! [3b]

//! [3c]

    setWindowTitle(tr("Text Finder"));

    isFirstTime = true;

}

//! [3c]

//! [4]

QWidget* TextFinder::loadUiFile()

{

    QUiLoader loader;

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

    file.open(QFile::ReadOnly);

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

    file.close();

    return formWidget;

}

//! [4]

//! [5]

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);

}

//! [5]

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

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();

//! [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]

        isFirstTime = false;

        if (found == false) {

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

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

        }    

    }

}

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