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** This file is part of the QtSCriptTools module of the Qt Toolkit.

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

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

#include "qscriptedit_p.h"

#include "qscriptsyntaxhighlighter_p.h"

#include <QtGui/qpainter.h>

#include <QtGui/qicon.h>

#include <QtGui/qboxlayout.h>

#include <QtGui/qlabel.h>

#include <QtGui/qlineedit.h>

#include <QtGui/qmenu.h>

#include <QtGui/qaction.h>

#include <QtGui/qwidgetaction.h>

#include <QtCore/qdebug.h>

QT_BEGIN_NAMESPACE

class QScriptEditExtraArea : public QWidget

{

public:

    QScriptEditExtraArea(QScriptEdit *edit)

        : QWidget(edit)

    {

        setMouseTracking(true);

    }

    QSize sizeHint() const {

        return QSize(editor()->extraAreaWidth(), 0);

    }

protected:

    void paintEvent(QPaintEvent *event)

    {

        editor()->extraAreaPaintEvent(event);

    }

    void mousePressEvent(QMouseEvent *event)

    {

        editor()->extraAreaMouseEvent(event);

    }

    void mouseMoveEvent(QMouseEvent *event)

    {

        editor()->extraAreaMouseEvent(event);

    }

    void mouseReleaseEvent(QMouseEvent *event)

    {

        editor()->extraAreaMouseEvent(event);

    }

    bool event(QEvent *event)

    {

        if (editor()->extraAreaEvent(event))

            return true;

        return QWidget::event(event);

    }

private:

    QScriptEdit *editor() const

    {

        return qobject_cast<QScriptEdit*>(parent());

    }

};

QScriptEdit::QScriptEdit(QWidget *parent)

    : QPlainTextEdit(parent)

{

    m_baseLineNumber = 1;

    m_executionLineNumber = -1;

    m_extraArea = new QScriptEditExtraArea(this);

    QObject::connect(this, SIGNAL(blockCountChanged(int)),

                     this, SLOT(updateExtraAreaWidth()));

    QObject::connect(this, SIGNAL(updateRequest(QRect,int)),

                     this, SLOT(updateExtraArea(QRect,int)));

    QObject::connect(this, SIGNAL(cursorPositionChanged()),

                     this, SLOT(highlightCurrentLine()));

    updateExtraAreaWidth();

#ifndef QT_NO_SYNTAXHIGHLIGHTER

    (void) new QScriptSyntaxHighlighter(document());

#endif

}

QScriptEdit::~QScriptEdit()

{

}

int QScriptEdit::baseLineNumber() const

{

    return m_baseLineNumber;

}

void QScriptEdit::setBaseLineNumber(int base)

{

    m_baseLineNumber = base;

    m_extraArea->update();

}

int QScriptEdit::executionLineNumber() const

{

    return m_executionLineNumber;

}

void QScriptEdit::setExecutionLineNumber(int lineNumber, bool error)

{

    m_executionLineNumber = lineNumber;

    m_executionLineNumberHasError = error;

    m_extraArea->update();

    updateExtraSelections();

    gotoLine(lineNumber);

}

void QScriptEdit::setExecutableLineNumbers(const QSet<int> &lineNumbers)

{

    m_executableLineNumbers = lineNumbers;

}

bool QScriptEdit::isExecutableLine(int lineNumber) const

{

#if 0 // ### enable me once we have information about the script again

    return m_executableLineNumbers.contains(lineNumber);

#else

    Q_UNUSED(lineNumber);

    return true;

#endif

}

int QScriptEdit::currentLineNumber() const

{

    return textCursor().blockNumber() + m_baseLineNumber;

}

void QScriptEdit::gotoLine(int lineNumber)

{

    int blockNumber = lineNumber - m_baseLineNumber;

    const QTextBlock &block = document()->findBlockByNumber(blockNumber);

    if (block.isValid()) {

        setTextCursor(QTextCursor(block));

        centerCursor();

    }

}

void QScriptEdit::setBreakpoint(int lineNumber)

{

    m_breakpoints[lineNumber] = BreakpointData();

    m_extraArea->update();

}

void QScriptEdit::setBreakpointEnabled(int lineNumber, bool enable)

{

    m_breakpoints[lineNumber].enabled = enable;

    m_extraArea->update();

}

void QScriptEdit::deleteBreakpoint(int lineNumber)

{

    m_breakpoints.remove(lineNumber);

    m_extraArea->update();

}

void QScriptEdit::paintEvent(QPaintEvent *e)

{

    QPlainTextEdit::paintEvent(e);

}

void QScriptEdit::resizeEvent(QResizeEvent *e)

{

    QPlainTextEdit::resizeEvent(e);

    QRect cr = contentsRect();

    int x = isLeftToRight() ? cr.left() : cr.left() + cr.width() - extraAreaWidth();

    m_extraArea->setGeometry(QRect(x, cr.top(), extraAreaWidth(), cr.height()));

}

void QScriptEdit::updateExtraAreaWidth()

{

    if (isLeftToRight())

        setViewportMargins(extraAreaWidth(), 0, 0, 0);

    else

        setViewportMargins(0, 0, extraAreaWidth(), 0);

}

void QScriptEdit::updateExtraArea(const QRect &rect, int dy)

{

    if (dy)

        m_extraArea->scroll(0, dy);

    else

        m_extraArea->update(0, rect.y(), m_extraArea->width(), rect.height());

    if (rect.contains(viewport()->rect()))

        updateExtraAreaWidth();

}

void QScriptEdit::highlightCurrentLine()

{

    updateExtraSelections();

}

void QScriptEdit::updateExtraSelections()

{

    QList<QTextEdit::ExtraSelection> extraSelections;

    {

        QTextEdit::ExtraSelection selection;

        QColor lineColor = QColor(Qt::yellow).lighter(160);

        selection.format.setBackground(lineColor);

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

        selection.cursor = textCursor();

        selection.cursor.clearSelection();

        extraSelections.append(selection);

    }

    if (m_executionLineNumber != -1) {

        QTextEdit::ExtraSelection selection;

        QColor lineColor;

        if (m_executionLineNumberHasError)

            lineColor = QColor(Qt::red);

        else

            lineColor = QColor(Qt::green).lighter(160);

        selection.format.setBackground(lineColor);

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

        int blockNumber = m_executionLineNumber - m_baseLineNumber;

        selection.cursor = QTextCursor(document()->findBlockByNumber(blockNumber));

        selection.cursor.clearSelection();

        extraSelections.append(selection);

    }

    setExtraSelections(extraSelections);

}

int QScriptEdit::extraAreaWidth() const

{

    int space = 0;

    const QFontMetrics fm(fontMetrics());

    int digits = 1;

    int max = qMax(1, blockCount() + m_baseLineNumber);

    while (max >= 10) {

        max /= 10;

        ++digits;

    }

    space += fm.width(QLatin1Char('9')) * digits;

    int markWidth = fm.lineSpacing();

    space += markWidth;

    space += 4;

    return space;

}

void QScriptEdit::extraAreaPaintEvent(QPaintEvent *e)

{

    QRect rect = e->rect();

    QPalette pal = palette();

    pal.setCurrentColorGroup(QPalette::Active);

    QPainter painter(m_extraArea);

    painter.fillRect(rect, Qt::lightGray);

    const QFontMetrics fm(fontMetrics());

    int markWidth = fm.lineSpacing();

    int extraAreaWidth = m_extraArea->width();

    QLinearGradient gradient(QPointF(extraAreaWidth - 10, 0), QPointF(extraAreaWidth, 0));

    gradient.setColorAt(0, pal.color(QPalette::Background));

    gradient.setColorAt(1, pal.color(QPalette::Base));

    painter.fillRect(rect, gradient);

    QLinearGradient gradient2(QPointF(0, 0), QPointF(markWidth, 0));

    gradient2.setColorAt(0, pal.color(QPalette::Dark));

    gradient2.setColorAt(1, pal.color(QPalette::Background));

    painter.fillRect(rect.intersected(QRect(rect.x(), rect.y(), markWidth, rect.height())), gradient2);

    painter.setPen(QPen(pal.color(QPalette::Background), 2));

    if (isLeftToRight())

        painter.drawLine(rect.x() + extraAreaWidth-1, rect.top(), rect.x() + extraAreaWidth-1, rect.bottom());

    else

        painter.drawLine(rect.x(), rect.top(), rect.x(), rect.bottom());

    painter.setRenderHint(QPainter::Antialiasing);

    QTextBlock block = firstVisibleBlock();

    int blockNumber = block.blockNumber();

    qreal top = blockBoundingGeometry(block).translated(contentOffset()).top();

    qreal bottom = top + blockBoundingRect(block).height();

    QString imagesPath = QString::fromLatin1(":/qt/scripttools/debugging/images");

    QString imageExt;

// SVGs don't work on all platforms, even when QT_NO_SVG is not defined, so disable SVG usage for now.

// #ifndef QT_NO_SVG

#if 0

    imageExt = QString::fromLatin1("svg");

#else

    imageExt = QString::fromLatin1("png");

#endif

    while (block.isValid() && top <= rect.bottom()) {

        if (block.isVisible() && bottom >= rect.top()) {

            int lineNumber = blockNumber + m_baseLineNumber;

            if (m_breakpoints.contains(lineNumber)) {

                int radius = fm.lineSpacing() - 1;

                QRect r(rect.x(), (int)top, radius, radius);

                QIcon icon(m_breakpoints[lineNumber].enabled

                           ? QString::fromLatin1("%0/breakpoint.%1").arg(imagesPath).arg(imageExt)

                           : QString::fromLatin1("%0/d_breakpoint.%1").arg(imagesPath).arg(imageExt));

                icon.paint(&painter, r, Qt::AlignCenter);

            }

            if (m_executionLineNumber == lineNumber) {

                int radius = fm.lineSpacing() - 1;

                QRect r(rect.x(), (int)top, radius, radius);

                QIcon icon(QString::fromLatin1("%0/location.%1").arg(imagesPath).arg(imageExt));

                icon.paint(&painter, r, Qt::AlignCenter);

            }

            if (!isExecutableLine(lineNumber))

                painter.setPen(pal.color(QPalette::Mid));

            else

                painter.setPen(QColor(Qt::darkCyan));

            QString number = QString::number(lineNumber);

            painter.drawText(rect.x() + markWidth, (int)top, rect.x() + extraAreaWidth - markWidth - 4,

                             fm.height(), Qt::AlignRight, number);

        }

        block = block.next();

        top = bottom;

        bottom = top + blockBoundingRect(block).height();

        ++blockNumber;

    }

}

void QScriptEdit::extraAreaMouseEvent(QMouseEvent *e)

{

    QTextCursor cursor = cursorForPosition(QPoint(0, e->pos().y()));

    cursor.setPosition(cursor.block().position());

    QFontMetrics fm(font());

    int markWidth = fm.lineSpacing();

    if (e->type() == QEvent::MouseMove && e->buttons() == 0) { // mouse tracking

        bool hand = (e->pos().x() <= markWidth);

        int lineNumber = cursor.blockNumber() + m_baseLineNumber;

        hand = hand && isExecutableLine(lineNumber);

#ifndef QT_NO_CURSOR

        if (hand != (m_extraArea->cursor().shape() == Qt::PointingHandCursor))

            m_extraArea->setCursor(hand ? Qt::PointingHandCursor : Qt::ArrowCursor);

#endif

    }

    if (e->type() == QEvent::MouseButtonPress) {

        if (e->button() == Qt::LeftButton) {

            int lineNumber = cursor.blockNumber() + m_baseLineNumber;

            bool executable = isExecutableLine(lineNumber);

            if ((e->pos().x() <= markWidth) && executable)

                m_extraAreaToggleBlockNumber = cursor.blockNumber();

            else

                m_extraAreaToggleBlockNumber = -1;

        }

    } else if (e->type() == QEvent::MouseButtonRelease) {

        if (e->button() == Qt::LeftButton) {

            if ((m_extraAreaToggleBlockNumber != -1) && (e->pos().x() <= markWidth)) {

                int lineNumber = m_extraAreaToggleBlockNumber + m_baseLineNumber;

                bool on = !m_breakpoints.contains(lineNumber);

                emit breakpointToggleRequest(lineNumber, on);

            }

        } else if (e->button() == Qt::RightButton) {

            int lineNumber = cursor.blockNumber() + m_baseLineNumber;

            if (!isExecutableLine(lineNumber))

                return;

            bool has = m_breakpoints.contains(lineNumber);

            QMenu *popup = new QMenu();

            QAction *toggleAct = new QAction(tr("Toggle Breakpoint"), popup);

            popup->addAction(toggleAct);

            QAction *disableAct = new QAction(tr("Disable Breakpoint"), popup);

            QAction *enableAct = new QAction(tr("Enable Breakpoint"), popup);

            QWidget *conditionWidget = new QWidget();

            {

                QHBoxLayout *hbox = new QHBoxLayout(conditionWidget);

                hbox->addWidget(new QLabel(tr("Breakpoint Condition:")));

                hbox->addWidget(new QLineEdit());

            }

//            QWidgetAction *conditionAct = new QWidgetAction(popup);

//            conditionAct->setDefaultWidget(conditionWidget);

            if (has) {

                popup->addSeparator();

                popup->addAction(m_breakpoints[lineNumber].enabled ? disableAct : enableAct);

//                popup->addAction(conditionAct);

            }

            QAction *ret = popup->exec(e->globalPos());

            if (ret) {

                if (ret == toggleAct) {

                    emit breakpointToggleRequest(lineNumber, !has);

                } else if (ret == disableAct) {

                    emit breakpointEnableRequest(lineNumber, false);

                } else if (ret == enableAct) {

                    emit breakpointEnableRequest(lineNumber, true);

                }// else if (ret == conditionAct) {

                //}

            }

            popup->deleteLater();

        }

    }

}

bool QScriptEdit::extraAreaEvent(QEvent *e)

{

    if (e->type() == QEvent::ToolTip) {

        // ### show the breakpoint's condition, if any

        return true;

    }

    return false;

}

QT_END_NAMESPACE