How Do You Make A Callback For The Gui?

[BrianK]

I want to make a "reset simulation" button.

In my template list, I'm guessing I need some sort of a template like this:

PRM_Template(PRM_CALLBACK, 1, &names[3], 0, 0, 0, ???);

but I'm a bit lost at the "???" - what goes there? I'm not sure I have the syntax correct. I believe it should be something like "&resetSim" when there is a resetSim func that looks something like:

int SOP_whatever::resetSim(void* foobar, int index, float time, const PRM_Template* foo) {
  cout << "\n\nRESET\n" << endl;
}

but that doesn't want to compile.

q1: is that close to correct?

q2: does the reset need the void* or PRM_Template* params, or can I just pass a NULL if I know I won't use them? What does the void* point to anyway? What is "index"?

[George]

Hi Brian,

I believe you can do something like:

PRM_Template(PRM_CALLBACK, 1, &names[3], 0, 0, 0, SOP_whatever::resetSim)

Your resetSim() function should be declared in the header as such:

static int resetSim(void *data, int index, float t, const PRM_Template *);

Once inside resetSim, you should be able to cast data to (SOP_whatever *) and use it as you'd like.

Hope that helps.

George.

[Guest xionmark]

Hi Brian,

Here's an example:

// Declare a name for the "write the file" button
static PRM_Name          names[] = {
...
<SNIP>
	PRM_Name("write_file",  "Write Real Flow File"),
</SNIP>
...
}


// Declare a callback widget for the "write the file" button, include the reference to the callback function
PRM_Template(PRM_CALLBACK,  1, &names[5], 0, 0, 0, 
 SOP_RF_Export::writeTheFile),


// Here's the callback function for the "write the file" button
int SOP_RF_Export::writeTheFile(void *data, int index,  
  float time, const PRM_Template *tplate ) {

    SOP_RF_Export *me = (SOP_RF_Export *) data;

	me->calledFromCallback = true;
	me->myCallBackFlags = 0;

	OP_Context myContext(time);
	myContext.setData(data, OP_GEOMETRY_DATA);

	me->myCallBackError = me->cookMe(myContext);

    return 1;
}

--Mark

[BrianK]

Thanks to both of you.

[pbowmar]

Hi Brian,

Here's an example:

// Declare a name for the "write the file" button
static PRM_Name		  names[] = {
...
<SNIP>
	PRM_Name("write_file",  "Write Real Flow File"),
</SNIP>
...
}
// Declare a callback widget for the "write the file" button, include the reference to the callback function
PRM_Template(PRM_CALLBACK,  1, &names[5], 0, 0, 0, 
 SOP_RF_Export::writeTheFile),
// Here's the callback function for the "write the file" button
int SOP_RF_Export::writeTheFile(void *data, int index,  
  float time, const PRM_Template *tplate ) {

	SOP_RF_Export *me = (SOP_RF_Export *) data;

	me->calledFromCallback = true;
	me->myCallBackFlags = 0;

	OP_Context myContext(time);
	myContext.setData(data, OP_GEOMETRY_DATA);

	me->myCallBackError = me->cookMe(myContext);

	return 1;
}

--Mark

In H9 I seem to have to do this:

PRM_Template(PRM_CALLBACK,  1, &names[5], 0, 0, 0,
&SOP_RF_Export::writeTheFile)

Note the ampersand in front of the function.

I still can't get it to work but this seems to get closer

Cheers

PeteR B