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#include "xt.h"
#define MAX_CLASS 128
#define MAX_CALLBACK_PER_CLASS 10
typedef struct {
char *name;
int has_arg;
} CALLBACK_INFO;
typedef struct {
WidgetClass class;
char *name;
CALLBACK_INFO cb[MAX_CALLBACK_PER_CLASS], *cblast;
XtResourceList sub_resources;
int num_resources;
} CLASS_INFO;
static CLASS_INFO ctab[MAX_CLASS], *clast = ctab;
Generic_Predicate (Class)
Generic_Simple_Equal (Class, CLASS, wclass)
Generic_Print (Class, "#[class %s]", CLASS(x)->name)
Object Make_Class (class, name) WidgetClass class; char *name; {
Object c;
c = Find_Object (T_Class, (GENERIC)0, Match_Xt_Obj, class);
if (Nullp (c)) {
c = Alloc_Object (sizeof (struct S_Class), T_Class, 0);
CLASS(c)->tag = Null;
CLASS(c)->wclass = class;
CLASS(c)->name = name;
Register_Object (c, (GENERIC)0, (PFO)0, 0);
/* See comment in Define_Class below */
XtInitializeWidgetClass (class);
}
return c;
}
Object Make_Widget_Class (class) WidgetClass class; {
register CLASS_INFO *p;
for (p = ctab; p < clast; p++)
if (p->class == class)
return Make_Class (class, p->name);
Primitive_Error ("undefined widget class ~s", Xt_Class_Name (class));
/*NOTREACHED*/
}
static Object P_Find_Class (name) Object name; {
register CLASS_INFO *p;
register char *s = Get_Strsym (name);
for (p = ctab; p < clast; p++) {
if (streq (p->name, s))
return Make_Class (p->class, p->name);
}
Primitive_Error ("no such widget class: ~s", name);
/*NOTREACHED*/
}
static Object P_Class_Existsp (name) Object name; {
register CLASS_INFO *p;
register char *s = Get_Strsym (name);
for (p = ctab; p < clast; p++) {
if (streq (p->name, s))
return True;
}
return False;
}
char *Class_Name (class) WidgetClass class; {
register CLASS_INFO *p;
for (p = ctab; p < clast && p->class != class; p++)
;
if (p == clast)
return "unknown";
return p->name;
}
void Get_Sub_Resource_List (class, rp, np) WidgetClass class;
XtResourceList *rp; Cardinal *np; {
register CLASS_INFO *p;
for (p = ctab; p < clast && p->class != class; p++)
;
if (p == clast)
Primitive_Error ("undefined widget class ~s", Xt_Class_Name (class));
*np = p->num_resources;
*rp = p->sub_resources;
}
static Object P_Class_Resources (c) Object c; {
Check_Type (c, T_Class);
return Get_Resources (CLASS(c)->wclass, XtGetResourceList, 1);
}
static Object P_Class_Constraint_Resources (c) Object c; {
Check_Type (c, T_Class);
return Get_Resources (CLASS(c)->wclass, XtGetConstraintResourceList, 1);
}
static Object P_Class_Sub_Resources (c) Object c; {
Check_Type (c, T_Class);
return Get_Resources (CLASS(c)->wclass, Get_Sub_Resource_List, 0);
}
void Define_Class (name, class, r, nr) char *name; WidgetClass class;
XtResourceList r; {
Set_Error_Tag ("define-class");
if (clast == ctab+MAX_CLASS)
Primitive_Error ("too many widget classes");
/*
* The next line should read:
* XtInitializeWidgetClass (class);
* However, there is a bug in Motif 1.1.4 that causes an application
* to drop core if the row-column widget class is initialized before
* the first vendor-shell widget has been created.
* Thus, we can't initialize any classes at this point; we will do
* it in Make_Class above instead.
* This essentially causes a class to be initialized the first time
* it is used.
*/
clast->name = name;
clast->class = class;
clast->cb[0].name = XtNdestroyCallback;
clast->cb[0].has_arg = 0;
clast->cblast = clast->cb+1;
clast->sub_resources = r;
clast->num_resources = nr;
clast++;
}
void Define_Callback (cl, s, has_arg) char *cl, *s; {
register CLASS_INFO *p;
Set_Error_Tag ("define-callback");
for (p = ctab; p < clast; p++)
if (streq (p->name, cl)) {
if (p->cblast == p->cb+MAX_CALLBACK_PER_CLASS)
Primitive_Error ("too many callbacks for this class");
p->cblast->name = s;
p->cblast->has_arg = has_arg;
p->cblast++;
return;
}
Primitive_Error ("undefined class");
}
PFX2S Find_Callback_Converter (c, name, sname) WidgetClass c; char *name;
Object sname; {
register CLASS_INFO *p;
register CALLBACK_INFO *q;
PFX2S conv;
for (p = ctab; p < clast; p++)
if (p->class == c) {
for (q = p->cb; q < p->cblast; q++)
if (streq (q->name, name)) {
if (q->has_arg) {
char s1[128], s2[128], msg[256];
/* First look for a class specific converter
* then for a general one. Callback converters
* have a prefix "callback:" to avoid name conflicts
* with converters for normal resources.
*/
sprintf (s1, "callback:%s-%s", p->name, name);
conv = Find_Converter_To_Scheme (s1);
if (conv == 0) {
sprintf(s2, "callback:%s", name);
conv = Find_Converter_To_Scheme (s2);
if (conv == 0) {
sprintf (msg,
"no callback converter for %s or %s",
s1, s2, name);
Primitive_Error (msg);
}
}
return conv;
} else return (PFX2S)0;
}
Primitive_Error ("no such callback: ~s", sname);
}
Primitive_Error ("undefined widget class ~s", Xt_Class_Name (c));
/*NOTREACHED*/
}
elk_init_xt_class () {
Generic_Define (Class, "class", "class?");
Define_Primitive (P_Find_Class, "find-class", 1, 1, EVAL);
Define_Primitive (P_Class_Resources, "class-resources", 1, 1, EVAL);
Define_Primitive (P_Class_Constraint_Resources,
"class-constraint-resources", 1, 1, EVAL);
Define_Primitive (P_Class_Sub_Resources,
"class-sub-resources", 1, 1, EVAL);
Define_Primitive (P_Class_Existsp, "class-exists?", 1, 1, EVAL);
/*
* Doesn't work with Motif-1.1.0:
*
Define_Class ("simple", simpleWidgetClass, (XtResourceList)0, 0);
*/
Define_Class ("core", widgetClass, (XtResourceList)0, 0);
Define_Class ("constraint", constraintWidgetClass, (XtResourceList)0, 0);
Define_Class ("composite", compositeWidgetClass, (XtResourceList)0, 0);
}
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