source: branches/4.5.1/demos/shared/arthurwidgets.cpp@ 921

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** Contact: Qt Software Information ([email protected])
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** This file is part of the demonstration applications of the Qt Toolkit.
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** General Public License version 3.0 as published by the Free Software
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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>

#ifdef Q_WS_X11
#include <private/qpixmapdata_p.h>
#endif

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()