Moderator
Posts: 2240 from 2003/2/24
I'll try to explain it based the baseclass listview in MMamM :
Code:
static ULONG mNew(struct IClass *cl,Object *obj,struct opSet *msg)
{
struct Data *data,t;
obj = (Object*)DoSuperNew(cl,obj,
MUIA_List_DragType, MUIV_List_DragType_Immediate,
MUIA_List_Title,TRUE,
MUIA_List_Format, " MINWIDTH=60 BAR,MAXWIDTH=40",
MUIA_List_ConstructHook,MUIV_List_ConstructHook_String,
MUIA_List_DestructHook,MUIV_List_DestructHook_String,
TAG_MORE,msg->ops_AttrList,
TAG_DONE);
if(obj)
{
data = (struct Data*)INST_DATA(cl,obj);
*data = t;
doset( obj, data, msg->ops_AttrList);
}
return (ULONG)obj;
}
The MUIA_List_Format tells MUI that I want a List with to columns seperated by a bar.
Construct/DestructHooks makes sure that the entries get copied as strings instead of just passing a pointer.
The tricky part here is that MUI will only maintain 1 object per row, be it a string or anything else and you need to decipher that into seperate strings for every column yourself.
I decided here to merge both into 1 string, which will be seperated at display, allowing me to use MUIV_List_ConstructHook_String. If you use your own data object you'll need to do your own housekeeping.
Code:
static ULONG mDisplay(struct IClass *cl,Object *obj,struct MUIP_List_Display *msg)
{
struct TagItem *tstate, *tag;
struct Data *data = (struct Data*)INST_DATA(cl,obj);
if(msg->entry == 0)
{
*msg->array++ = "Method";
*msg->array = "Class";
}
If msg->entry is 0 MUI want the strings for title of each column. (I did set MUIA_List_Title to true, remember)
Code:
else
{
static char classname[100];
char *clend = classname;
char *methodname = (char*) msg->entry;
ULONG i = 0;
while((!isspace(*methodname)&&(*methodname)))
{
*clend = *methodname;
clend++;
methodname++;
}
methodname++;
*clend = 0;
*msg->array++ = methodname;
*msg->array = classname;
}
return 0;
}
Otherwise I sperate the stored string into 2 strings for that row.
msg->array is a pointer to an array of STRPTRs, one for each column in your list.
Offcourse you will need to add this to your dispather:
Code:
case MUIM_List_Display : return(mDisplay (cl,obj,(struct MUIP_List_Display *)msg));
