QGLWidget in an qtbrowserplugin does not work on Mac / OSX

When placing a QGLWidget in an solutions qtbrowserplugin plugin
the GL window is not drawn in the correct place or size on the page when viewed on a Mac / OSX browser.

It is also strangely clipped as the browser window is resized.

Note :
The supported platforms of the QtBrowserPlugin are listed on this page : http://doc.trolltech.com/solutions/4/qtbrowserplugin/
which mentions MacOS X support is experimental.

The following code replaces the trivial.cpp in the trivial plugin demonstration and demonstrates the issue when visiting the URL :

http://doc.trolltech.com/solutions/4/qtbrowserplugin/qtbrowserplugin-example-trivial.html

Same code works fine on windows.

#include <QtGui>
#include <qtbrowserplugin.h>
#include <QGLWidget>
#include <QBoxLayout>
#include <math.h>

class GLWidget : public QGLWidget
{
Q_OBJECT

public:
GLWidget(QWidget *parent = 0);
~GLWidget();

QSize minimumSizeHint() const;
QSize sizeHint() const;

public slots:
void setXRotation(int angle);
void setYRotation(int angle);
void setZRotation(int angle);

signals:
void xRotationChanged(int angle);
void yRotationChanged(int angle);
void zRotationChanged(int angle);

protected:
void initializeGL();
void paintGL();
void resizeGL(int width, int height);
void mousePressEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);

private:
GLuint makeObject();
void quad(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,
GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4);
void extrude(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2);
void normalizeAngle(int *angle);

GLuint object;
int xRot;
int yRot;
int zRot;
QPoint lastPos;
QColor trolltechGreen;
QColor trolltechPurple;
};

GLWidget::GLWidget(QWidget *parent)
: QGLWidget(parent)
{
object = 0;
xRot = 0;
yRot = 0;
zRot = 0;

trolltechGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
trolltechPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);
}

GLWidget::~GLWidget()
{
makeCurrent();
glDeleteLists(object, 1);
}

QSize GLWidget::minimumSizeHint() const
{
return QSize(50, 50);
}

QSize GLWidget::sizeHint() const
{
return QSize(400, 400);
}

void GLWidget::setXRotation(int angle)
{
normalizeAngle(&angle);
if (angle != xRot)

{ xRot = angle; emit xRotationChanged(angle); updateGL(); }

}

void GLWidget::setYRotation(int angle)
{
normalizeAngle(&angle);
if (angle != yRot)

{ yRot = angle; emit yRotationChanged(angle); updateGL(); }

}

void GLWidget::setZRotation(int angle)
{
normalizeAngle(&angle);
if (angle != zRot)

{ zRot = angle; emit zRotationChanged(angle); updateGL(); }

}

void GLWidget::initializeGL()
{
setAutoFillBackground(false);
qglClearColor(trolltechPurple.dark());
object = makeObject();
glShadeModel(GL_FLAT);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
}

void GLWidget::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslated(0.0, 0.0, -10.0);
glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
glRotated(zRot / 16.0, 0.0, 0.0, 1.0);
glCallList(object);
}

void GLWidget::resizeGL(int width, int height)
{
int side = qMin(width, height);
glViewport((width - side) / 2, (height - side) / 2, side, side);

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);
glMatrixMode(GL_MODELVIEW);
}

void GLWidget::mousePressEvent(QMouseEvent *event)
{
lastPos = event->pos();
}

void GLWidget::mouseMoveEvent(QMouseEvent *event)
{
int dx = event->x() - lastPos.x();
int dy = event->y() - lastPos.y();

if (event->buttons() & Qt::LeftButton)

{ setXRotation(xRot + 8 * dy); setYRotation(yRot + 8 * dx); }

else if (event->buttons() & Qt::RightButton)

{ setXRotation(xRot + 8 * dy); setZRotation(zRot + 8 * dx); }

lastPos = event->pos();
}

GLuint GLWidget::makeObject()
{
GLuint list = glGenLists(1);
glNewList(list, GL_COMPILE);

glBegin(GL_QUADS);

GLdouble x1 = +0.06;
GLdouble y1 = -0.14;
GLdouble x2 = +0.14;
GLdouble y2 = -0.06;
GLdouble x3 = +0.08;
GLdouble y3 = +0.00;
GLdouble x4 = +0.30;
GLdouble y4 = +0.22;

quad(x1, y1, x2, y2, y2, x2, y1, x1);
quad(x3, y3, x4, y4, y4, x4, y3, x3);

extrude(x1, y1, x2, y2);
extrude(x2, y2, y2, x2);
extrude(y2, x2, y1, x1);
extrude(y1, x1, x1, y1);
extrude(x3, y3, x4, y4);
extrude(x4, y4, y4, x4);
extrude(y4, x4, y3, x3);

const double Pi = 3.14159265358979323846;
const int NumSectors = 200;

for (int i = 0; i < NumSectors; ++i)

{ double angle1 = (i * 2 * Pi) / NumSectors; GLdouble x5 = 0.30 * sin(angle1); GLdouble y5 = 0.30 * cos(angle1); GLdouble x6 = 0.20 * sin(angle1); GLdouble y6 = 0.20 * cos(angle1); double angle2 = ((i + 1) * 2 * Pi) / NumSectors; GLdouble x7 = 0.20 * sin(angle2); GLdouble y7 = 0.20 * cos(angle2); GLdouble x8 = 0.30 * sin(angle2); GLdouble y8 = 0.30 * cos(angle2); quad(x5, y5, x6, y6, x7, y7, x8, y8); extrude(x6, y6, x7, y7); extrude(x8, y8, x5, y5); }

glEnd();

glEndList();
return list;
}

void GLWidget::quad(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,
GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4)
{
qglColor(trolltechGreen);

glVertex3d(x1, y1, -0.05);
glVertex3d(x2, y2, -0.05);
glVertex3d(x3, y3, -0.05);
glVertex3d(x4, y4, -0.05);

glVertex3d(x4, y4, +0.05);
glVertex3d(x3, y3, +0.05);
glVertex3d(x2, y2, +0.05);
glVertex3d(x1, y1, +0.05);
}

void GLWidget::extrude(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2)
{
qglColor(trolltechGreen.dark(250 + int(100 * x1)));

glVertex3d(x1, y1, +0.05);
glVertex3d(x2, y2, +0.05);
glVertex3d(x2, y2, -0.05);
glVertex3d(x1, y1, -0.05);
}

void GLWidget::normalizeAngle(int *angle)
{
while (*angle < 0)
*angle += 360 * 16;
while (*angle > 360 * 16)
*angle -= 360 * 16;
}

class Trivial : public QWidget
{
Q_OBJECT
Q_PROPERTY(QString text READ text WRITE setText)

Q_CLASSINFO("ClassID", "

{5a22176d-118f-4185-9653-9f98958a6df8}

")
Q_CLASSINFO("InterfaceID", "

{2df735ba-da4f-4fb7-8f35-b8dfbf8cfd9a}

")
Q_CLASSINFO("EventsID", "

{449de213-f8bd-4d2e-a2cf-eab407c03245}

")

Q_CLASSINFO("MIME", "trivial/very:xxx:Trivial and useless")
Q_CLASSINFO("ToSuperClass", "Trivial")
Q_CLASSINFO("DefaultProperty", "text")

public:
Trivial(QWidget *parent = 0)
: QWidget(parent)

{ new QVBoxLayout(this); layout()->addWidget(new GLWidget()); }

void mousePressEvent(QMouseEvent *)

{ mouseDown(); }

void mouseMoveEvent(QMouseEvent *e)

{ mouseMove(e->x(), e->y()); }

void mouseReleaseEvent(QMouseEvent*)

{ mouseUp(); }

QString text() const

{ return m_text; }

public slots:
void about()

{ QMessageBox::aboutQt(this); }

void setText(const QString &text)

{ m_text = text; update(); }

signals:
void mouseDown();
void mouseMove(int x, int y);
void mouseUp();

protected:

private:
QString m_text;
};

#include "trivial.moc"

QTNPFACTORY_BEGIN("Trivial Qt-based Plugin", "A Qt-based LiveConnected plug-in that does nothing")
QTNPCLASS(Trivial)
QTNPFACTORY_END()

#ifdef QAXSERVER
#include <ActiveQt/QAxFactory>
QAXFACTORY_BEGIN("

{aa3216bf-7e20-482c-84c6-06167bacb616}

", "

{08538ca5-eb7a-4f24-a3c4-a120c6e04dc4}

")
QAXCLASS(Trivial)
QAXFACTORY_END()
#endif