One QGLWidget that manage QGLWidget childs

[polch]

Hi devs.

I would like to know if the following use case is supported by QT.

I have one "TopLevel" QGLWidget :

@class ParentGLWidget : public QGLWidget {
...
ParentGLWidget(QGLContext * context, QWidget *parent = 0) : QGLWidget(context, parent) {... }
...
void initializeGL()
{
qglClearColor(qtPurple.dark());
glEnable(GL_CULL_FACE);
...
}

void paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}

void resizeGL(int width, int height)
{
glViewport((width - side) / 2, (height - side) / 2, side, side);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrthof(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0);
glMatrixMode(GL_MODELVIEW);
}

}@

There are other "GLWidget" that should be drawn inside the top level widget context :
@class ChildGLWidget : public QGLWidget {
...
ChildGLWidget(QGLContext * context, QWidget *parent = 0) : QGLWidget(context, parent) {... }
...
void initializeGL()
{
// optional
// at least, should not overwrite what have been done in the top level widget
}

void paintGL()
{
glLoadIdentity();
glTranslatef(0.0, 0.0, -10.0);
glRotatef(xRot, 1.0, 0.0, 0.0);
// draw some object in the gl world
}

void resizeGL(int width, int height)
{
 // optional
 // at least, should not overwrite what have been done in the top level widget
}

}@

I would like to use them like this :
@
QGLContext * context = new QGLContext(QGLFormat(QGL::SampleBuffers));
ParentGLWidget * parent = new ParentGLWidget(context);
ChildGLWidget * child_1 = new ChildGLWidget(context, parent);
ChildGLWidget * child_2 = new ChildGLWidget(context, parent);
@

The childs could be managed (drawing, deletion, ...) by the parent (like traditional widgets do).

II haven't been able to run such a use case.

Is there any design flaw in this use case ?

Thank for your help.

[wspilot]

If you comment out the childs creation, does the ParentGLWidget show up correctly (so without childs)?

[polch]

Yes.

My test code works if display independently each widget in different contexts.