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.