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****************************************************************************/

#include "sourcecodeview.h"

#include <QtCore/QFile>

#include <QtCore/QFileInfo>

#include <QtCore/QTextStream>

#include <QtGui/QTextCharFormat>

#include <QtGui/QTextBlock>

#include <QtGui/QTextCursor>

QT_BEGIN_NAMESPACE

SourceCodeView::SourceCodeView(QWidget *parent)

  : QPlainTextEdit(parent),

    m_isActive(true),

    m_lineNumToLoad(0)

{

    setReadOnly(true);

}

void SourceCodeView::setSourceContext(const QString &fileName, const int lineNum)

{

    m_fileToLoad.clear();

    setToolTip(fileName);

    if (fileName.isNull()) {

        clear();

        m_currentFileName.clear();

        appendHtml(tr("<i>Source code not available</i>"));

        return;

    }

    if (m_isActive) {

        showSourceCode(fileName, lineNum);

    } else {

        m_fileToLoad = fileName;

        m_lineNumToLoad = lineNum;

    }

}

void SourceCodeView::setActivated(bool activated)

{

    m_isActive = activated;

    if (activated && !m_fileToLoad.isEmpty()) {

        showSourceCode(m_fileToLoad, m_lineNumToLoad);

        m_fileToLoad.clear();

    }

}

void SourceCodeView::showSourceCode(const QString &absFileName, const int lineNum)

{

    QString fileText = fileHash.value(absFileName);

    if (fileText.isNull()) { // File not in hash

        m_currentFileName.clear();

        // Assume fileName is relative to directory

        QFile file(absFileName);

        if (!file.exists()) {

            clear();

            appendHtml(tr("<i>File %1 not available</i>").arg(absFileName));

            return;

        }

        if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {

            clear();

            appendHtml(tr("<i>File %1 not readable</i>").arg(absFileName));

            return;

        }

        fileText = QString::fromLatin1(file.readAll());

        fileHash.insert(absFileName, fileText);

    }

    if (m_currentFileName != absFileName) {

        setPlainText(fileText);

        m_currentFileName = absFileName;

    }

    QTextCursor cursor = textCursor();

    cursor.setPosition(document()->findBlockByNumber(lineNum - 1).position());

    setTextCursor(cursor);

    centerCursor();

    cursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);

    cursor.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor);

    QTextEdit::ExtraSelection selectedLine;

    selectedLine.cursor = cursor;

    // Define custom color for line selection

    const QColor fg = palette().color(QPalette::Highlight);

    const QColor bg = palette().color(QPalette::Base);

    QColor col;

    const qreal ratio = 0.25;

    col.setRedF(fg.redF() * ratio + bg.redF() * (1 - ratio));

    col.setGreenF(fg.greenF() * ratio + bg.greenF() * (1 - ratio));

    col.setBlueF(fg.blueF() * ratio + bg.blueF() * (1 - ratio));

    selectedLine.format.setBackground(col);

    selectedLine.format.setProperty(QTextFormat::FullWidthSelection, true);

    setExtraSelections(QList<QTextEdit::ExtraSelection>() << selectedLine);

}

QT_END_NAMESPACE