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

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the demonstration applications of the Qt Toolkit.

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** 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

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

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** rights.  These rights are described in the Nokia Qt LGPL Exception

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** If you have questions regarding the use of this file, please contact

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** $QT_END_LICENSE$

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

#include "arthurwidgets.h"

#include <QApplication>

#include <QPainter>

#include <QPainterPath>

#include <QPixmapCache>

#include <QtEvents>

#include <QTextDocument>

#include <QAbstractTextDocumentLayout>

#include <QFile>

#include <QTextBrowser>

#include <QBoxLayout>

#include <private/qpixmapdata_p.h>

extern QPixmap cached(const QString &img);

ArthurFrame::ArthurFrame(QWidget *parent)

    : QWidget(parent)

    , m_prefer_image(false)

{

#ifdef QT_OPENGL_SUPPORT

    glw = 0;

    m_use_opengl = false;

    QGLFormat f = QGLFormat::defaultFormat();

    f.setSampleBuffers(true);

    f.setStencil(true);

    f.setAlpha(true);

    f.setAlphaBufferSize(8);

    QGLFormat::setDefaultFormat(f);

#endif

    m_document = 0;

    m_show_doc = false;

    m_tile = QPixmap(128, 128);

    m_tile.fill(Qt::white);

    QPainter pt(&m_tile);

    QColor color(230, 230, 230);

    pt.fillRect(0, 0, 64, 64, color);

    pt.fillRect(64, 64, 64, 64, color);

    pt.end();

//     QPalette pal = palette();

//     pal.setBrush(backgroundRole(), m_tile);

//     setPalette(pal);

#ifdef Q_WS_X11

    QPixmap xRenderPixmap(1, 1);

    m_prefer_image = xRenderPixmap.pixmapData()->classId() == QPixmapData::X11Class && !xRenderPixmap.x11PictureHandle();

#endif

}

#ifdef QT_OPENGL_SUPPORT

void ArthurFrame::enableOpenGL(bool use_opengl)

{

    m_use_opengl = use_opengl;

    if (!glw) {

        glw = new GLWidget(this);

        glw->setAutoFillBackground(false);

        glw->disableAutoBufferSwap();

        QApplication::postEvent(this, new QResizeEvent(size(), size()));

    }

    if (use_opengl) {

        glw->show();

    } else {

        glw->hide();

    }

    update();

}

#endif

void ArthurFrame::paintEvent(QPaintEvent *e)

{

#ifdef Q_WS_QWS

    static QPixmap *static_image = 0;

#else

    static QImage *static_image = 0;

#endif

    QPainter painter;

    if (preferImage()

#ifdef QT_OPENGL_SUPPORT

        && !m_use_opengl

#endif

        ) {

        if (!static_image || static_image->size() != size()) {

            delete static_image;

#ifdef Q_WS_QWS

            static_image = new QPixmap(size());

#else

            static_image = new QImage(size(), QImage::Format_RGB32);

#endif

        }

        painter.begin(static_image);

        int o = 10;

        QBrush bg = palette().brush(QPalette::Background);

        painter.fillRect(0, 0, o, o, bg);

        painter.fillRect(width() - o, 0, o, o, bg);

        painter.fillRect(0, height() - o, o, o, bg);

        painter.fillRect(width() - o, height() - o, o, o, bg);

    } else {

#ifdef QT_OPENGL_SUPPORT

        if (m_use_opengl) {

            painter.begin(glw);

            painter.fillRect(QRectF(0, 0, glw->width(), glw->height()), palette().color(backgroundRole()));

        } else {

            painter.begin(this);

        }

#else

        painter.begin(this);

#endif

    }

    painter.setClipRect(e->rect());

    painter.setRenderHint(QPainter::Antialiasing);

    QPainterPath clipPath;

    QRect r = rect();

    qreal left = r.x() + 1;

    qreal top = r.y() + 1;

    qreal right = r.right();

    qreal bottom = r.bottom();

    qreal radius2 = 8 * 2;

    clipPath.moveTo(right - radius2, top);

    clipPath.arcTo(right - radius2, top, radius2, radius2, 90, -90);

    clipPath.arcTo(right - radius2, bottom - radius2, radius2, radius2, 0, -90);

    clipPath.arcTo(left, bottom - radius2, radius2, radius2, 270, -90);

    clipPath.arcTo(left, top, radius2, radius2, 180, -90);

    clipPath.closeSubpath();

    painter.save();

    painter.setClipPath(clipPath, Qt::IntersectClip);

    painter.drawTiledPixmap(rect(), m_tile);

    // client painting

    paint(&painter);

    painter.restore();

    painter.save();

    if (m_show_doc)

        paintDescription(&painter);

    painter.restore();

    int level = 180;

    painter.setPen(QPen(QColor(level, level, level), 2));

    painter.setBrush(Qt::NoBrush);

    painter.drawPath(clipPath);

    if (preferImage()

#ifdef QT_OPENGL_SUPPORT

        && !m_use_opengl

#endif

        ) {

        painter.end();

        painter.begin(this);

#ifdef Q_WS_QWS

        painter.drawPixmap(e->rect(), *static_image, e->rect());

#else

        painter.drawImage(e->rect(), *static_image, e->rect());

#endif

    }

#ifdef QT_OPENGL_SUPPORT

    if (m_use_opengl && (inherits("PathDeformRenderer") || inherits("PathStrokeRenderer") || inherits("CompositionRenderer") || m_show_doc))

        glw->swapBuffers();

#endif

}

void ArthurFrame::resizeEvent(QResizeEvent *e)

{

#ifdef QT_OPENGL_SUPPORT

    if (glw)

        glw->setGeometry(0, 0, e->size().width()-1, e->size().height()-1);

#endif

    QWidget::resizeEvent(e);

}

void ArthurFrame::setDescriptionEnabled(bool enabled)

{

    if (m_show_doc != enabled) {

        m_show_doc = enabled;

        emit descriptionEnabledChanged(m_show_doc);

        update();

    }

}

void ArthurFrame::loadDescription(const QString &fileName)

{

    QFile textFile(fileName);

    QString text;

    if (!textFile.open(QFile::ReadOnly))

        text = QString("Unable to load resource file: '%1'").arg(fileName);

    else

        text = textFile.readAll();

    setDescription(text);

}

void ArthurFrame::setDescription(const QString &text)

{

    m_document = new QTextDocument(this);

    m_document->setHtml(text);

}

void ArthurFrame::paintDescription(QPainter *painter)

{

    if (!m_document)

        return;

    int pageWidth = qMax(width() - 100, 100);

    int pageHeight = qMax(height() - 100, 100);

    if (pageWidth != m_document->pageSize().width()) {

        m_document->setPageSize(QSize(pageWidth, pageHeight));

    }

    QRect textRect(width() / 2 - pageWidth / 2,

                   height() / 2 - pageHeight / 2,

                   pageWidth,

                   pageHeight);

    int pad = 10;

    QRect clearRect = textRect.adjusted(-pad, -pad, pad, pad);

    painter->setPen(Qt::NoPen);

    painter->setBrush(QColor(0, 0, 0, 63));

    int shade = 10;

    painter->drawRect(clearRect.x() + clearRect.width() + 1,

                      clearRect.y() + shade,

                      shade,

                      clearRect.height() + 1);

    painter->drawRect(clearRect.x() + shade,

                      clearRect.y() + clearRect.height() + 1,

                      clearRect.width() - shade + 1,

                      shade);

    painter->setRenderHint(QPainter::Antialiasing, false);

    painter->setBrush(QColor(255, 255, 255, 220));

    painter->setPen(Qt::black);

    painter->drawRect(clearRect);

    painter->setClipRegion(textRect, Qt::IntersectClip);

    painter->translate(textRect.topLeft());

    QAbstractTextDocumentLayout::PaintContext ctx;

    QLinearGradient g(0, 0, 0, textRect.height());

    g.setColorAt(0, Qt::black);

    g.setColorAt(0.9, Qt::black);

    g.setColorAt(1, Qt::transparent);

    QPalette pal = palette();

    pal.setBrush(QPalette::Text, g);

    ctx.palette = pal;

    ctx.clip = QRect(0, 0, textRect.width(), textRect.height());

    m_document->documentLayout()->draw(painter, ctx);

}

void ArthurFrame::loadSourceFile(const QString &sourceFile)

{

    m_sourceFileName = sourceFile;

}

void ArthurFrame::showSource()

{

    // Check for existing source

    if (qFindChild<QTextBrowser *>(this))

        return;

    QString contents;

    if (m_sourceFileName.isEmpty()) {

        contents = QString("No source for widget: '%1'").arg(objectName());

    } else {

        QFile f(m_sourceFileName);

        if (!f.open(QFile::ReadOnly))

            contents = QString("Could not open file: '%1'").arg(m_sourceFileName);

        else

            contents = f.readAll();

    }

    contents.replace('&', "&");

    contents.replace('<', "&lt;");

    contents.replace('>', ">");

    QStringList keywords;

    keywords << "for " << "if " << "switch " << " int " << "#include " << "const"

             << "void " << "uint " << "case " << "double " << "#define " << "static"

             << "new" << "this";

    foreach (QString keyword, keywords)

        contents.replace(keyword, QLatin1String("<font color=olive>") + keyword + QLatin1String("</font>"));

    contents.replace("(int ", "(<font color=olive><b>int </b></font>");

    QStringList ppKeywords;

    ppKeywords << "#ifdef" << "#ifndef" << "#if" << "#endif" << "#else";

    foreach (QString keyword, ppKeywords)

        contents.replace(keyword, QLatin1String("<font color=navy>") + keyword + QLatin1String("</font>"));

    contents.replace(QRegExp("(\\d\\d?)"), QLatin1String("<font color=navy>\\1</font>"));

    QRegExp commentRe("(//.+)\\n");

    commentRe.setMinimal(true);

    contents.replace(commentRe, QLatin1String("<font color=red>\\1</font>\n"));

    QRegExp stringLiteralRe("(\".+\")");

    stringLiteralRe.setMinimal(true);

    contents.replace(stringLiteralRe, QLatin1String("<font color=green>\\1</font>"));

    QString html = contents;

    html.prepend("<html><pre>");

    html.append("</pre></html>");

    QTextBrowser *sourceViewer = new QTextBrowser(0);

    sourceViewer->setWindowTitle("Source: " + m_sourceFileName.mid(5));

    sourceViewer->setParent(this, Qt::Dialog);

    sourceViewer->setAttribute(Qt::WA_DeleteOnClose);

    sourceViewer->setLineWrapMode(QTextEdit::NoWrap);

    sourceViewer->setHtml(html);

    sourceViewer->resize(600, 600);

    sourceViewer->show();

}