WidgetNode.c

Go to the documentation of this file.

/* $Xorg: WidgetNode.c,v 1.5 2001/02/09 02:03:53 xorgcvs Exp $ */

/*
 
Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.

*/

/* $XFree86: xc/lib/Xmu/WidgetNode.c,v 1.12 2002/09/19 13:21:58 tsi Exp $ */

/*
 * Author:  Jim Fulton, MIT X Consortium
 */



#include <stdio.h>
#include <stdlib.h>
#include <X11/Xos.h>
#include <X11/IntrinsicP.h>
#include <X11/Xmu/CharSet.h>
#include <X11/Xmu/WidgetNode.h>

/*
 * Prototypes
 */
static char *binsearch(char*, char*, int, int,
                       int (*__compar)(_Xconst void*, _Xconst void*));
static int compare_resource_entries(_Xconst void *a,  _Xconst void *b);
static XmuWidgetNode *find_resource(XmuWidgetNode*, char*, Bool);
static void mark_resource_owner(XmuWidgetNode*);
/*
 * Implementation
 */
static char *
binsearch(char *key, char *base, int nelems, int elemsize,
          int compar(_Xconst void*, _Xconst void*))
     /*
      * key             - template of object to find
      * base            - beginning of array
      * nelems          - number of elements in array
      * elemsize        - sizeof an element
      * compar          - qsort-style compare function
      */
{
    int lower = 0, upper = nelems - 1;

    while (lower <= upper) {
        int middle = (lower + upper) / 2;
        char *p = base + middle * elemsize;
        int res = (*compar) (p, key);

        if (res < 0) {
            lower = middle + 1;
        } else if (res == 0) {
            return p;
        } else {
            upper = middle - 1;
        }
    }

    return NULL;
}


static int
compare_resource_entries(register _Xconst void *a,
                         register _Xconst void *b)
{
    return strcmp (((XtResourceList)a)->resource_name,
                   ((XtResourceList)b)->resource_name);
}


static XmuWidgetNode *
find_resource(XmuWidgetNode *node, char *name, Bool cons)
{
    register XmuWidgetNode *sup;
    XtResource res;

#define reslist ((char *) (cons ? sup->constraints : sup->resources))
#define nreslist (int) (cons ? sup->nconstraints : sup->nresources)

    res.resource_name = name;
    for (sup = node->superclass; 
         sup && (XtResourceList) binsearch ((char *) &res,
                                            reslist, nreslist,
                                            sizeof(XtResource),
                                            compare_resource_entries);
         node = sup, sup = sup->superclass) ;

#undef reslist
#undef nreslist

    return node;
}


static void
mark_resource_owner(register XmuWidgetNode *node)
{
    register Cardinal i;
    XtResourceList childres;

    childres = node->resources;
    for (i = 0; i < node->nresources; i++, childres++) {
        node->resourcewn[i] = find_resource (node, childres->resource_name,
                                             False);
    }

    childres = node->constraints;
    for (i = 0; i < node->nconstraints; i++, childres++) {
        node->constraintwn[i] = find_resource (node, childres->resource_name,
                                                True);
    }
}


/*
 *                             Public Interfaces
 */

void
XmuWnInitializeNodes(XmuWidgetNode *nodearray, int nnodes)
{
    int i;
    XmuWidgetNode *wn;

    /*
     * Assume that the node array is in alphabetic order, so we need to
     * search backwards to make sure that the children are listed forward.
     */
    for (i = nnodes - 1, wn = nodearray + (nnodes - 1); i >= 0; i--, wn--) {
        WidgetClass superclass = XmuWnSuperclass(wn);
        int j;
        XmuWidgetNode *swn;
        int lablen = strlen (wn->label);
        int namelen = strlen (XmuWnClassname(wn));

        wn->lowered_label = XtMalloc (lablen + namelen + 2);
#if 0
        /* XtMalloc exits if failed */
        if (!wn->lowered_label) {
            fprintf (stderr,
                     "%s:  unable to allocate %d bytes for widget name\n",
                     "XmuWnInitializeNodes", lablen + namelen + 2);
            exit (1);
        }
#endif
        wn->lowered_classname = wn->lowered_label + (lablen + 1);
        XmuCopyISOLatin1Lowered (wn->lowered_label, wn->label);
        XmuCopyISOLatin1Lowered (wn->lowered_classname, XmuWnClassname(wn));
        wn->superclass = NULL;
        wn->have_resources = False;
        wn->resources = NULL;
        wn->resourcewn = NULL;
        wn->nresources = 0;
        wn->constraints = NULL;
        wn->constraintwn = NULL;
        wn->nconstraints = 0;
        wn->data = (XtPointer) NULL;

        /*
         * walk up the superclass chain
         */
        while (superclass) {
            for (j = 0, swn = nodearray; j < nnodes; j++, swn++) {
                if (superclass == XmuWnClass(swn)) {
                    wn->superclass = swn;
                    goto done;          /* stupid C language */
                }
            }
            /*
             * Hmm, we have a hidden superclass (such as in core in R4); just
             * ignore it and keep on walking
             */
            superclass = superclass->core_class.superclass;
        }
      done: 
        if (wn->superclass) {
            wn->siblings = wn->superclass->children;
            wn->superclass->children = wn;
        }
    }

    return;
}


void
XmuWnFetchResources(XmuWidgetNode *node, Widget toplevel,
                    XmuWidgetNode *topnode)
{
    Widget dummy;
    XmuWidgetNode *wn;

    if (node->have_resources) return;

    dummy = XtCreateWidget (node->label, XmuWnClass(node), toplevel,
                            NULL, 0);
    if (dummy) XtDestroyWidget (dummy);


    /*
     * walk up tree geting resources; since we've instantiated the widget,
     * we know that all of our superclasses have been initialized
     */
    for (wn = node; wn && !wn->have_resources; wn = wn->superclass) {
        XtGetResourceList (XmuWnClass(wn), &wn->resources, &wn->nresources);
        if (wn->resources) {
            qsort ((char *) wn->resources, wn->nresources,
                   sizeof(XtResource), compare_resource_entries);
        }
        wn->resourcewn = (XmuWidgetNode **) XtCalloc (wn->nresources,
                                                  sizeof (XmuWidgetNode *));
        if (!wn->resourcewn) {
            fprintf (stderr,
                     "%s:  unable to calloc %d %ld byte widget node ptrs\n",
                     "XmuWnFetchResources", wn->nresources,
                     (unsigned long)sizeof (XmuWidgetNode *));
            exit (1);
        }

        XtGetConstraintResourceList (XmuWnClass(wn), &wn->constraints,
                                     &wn->nconstraints);
        if (wn->constraints) {
            qsort ((char *) wn->constraints, wn->nconstraints,
                   sizeof(XtResource), compare_resource_entries);
        }
        wn->constraintwn = (XmuWidgetNode **)
          XtCalloc (wn->nconstraints, sizeof (XmuWidgetNode *));
        if (!wn->constraintwn) {
            fprintf (stderr,
                     "%s:  unable to calloc %d %ld byte widget node ptrs\n",
                     "XmuWnFetchResources", wn->nconstraints,
                     (unsigned long)sizeof (XmuWidgetNode *));
            exit (1);
        }

        wn->have_resources = True;
        if (wn == topnode) break;
    }


    /*
     * Walk up tree removing all resources that appear in superclass; we can
     * mash the resource list in place since it was copied out of widget.
     */
    for (wn = node; wn; wn = wn->superclass) {
        mark_resource_owner (wn);
        if (wn == topnode) break;
    }

    return;
}


int
XmuWnCountOwnedResources(XmuWidgetNode *node, XmuWidgetNode *ownernode,
                         Bool cons)
{
    register int i;
    XmuWidgetNode **wn = (cons ? node->constraintwn : node->resourcewn);
    int nmatches = 0;

    for (i = (cons ? node->nconstraints : node->nresources); i > 0; i--, wn++)
      if (*wn == ownernode) nmatches++;
    return nmatches;
}


XmuWidgetNode *
XmuWnNameToNode(XmuWidgetNode *nodelist, int nnodes, _Xconst char *name)
{
    int i;
    XmuWidgetNode *wn;
    char tmp[1024];

    XmuNCopyISOLatin1Lowered(tmp, name, sizeof(tmp));
    for (i = 0, wn = nodelist; i < nnodes; i++, wn++) {
        if (strcmp (tmp, wn->lowered_label) == 0 ||
            strcmp (tmp, wn->lowered_classname) == 0) {
          return wn;
        }
    }
    return NULL;
}

---