Hooks.c revision a3bd7f05 
1/*
2
3Copyright 1994, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from The Open Group.
24
25*/
26
27#ifdef HAVE_CONFIG_H
28#include <config.h>
29#endif
30#include "IntrinsicI.h"
31#include "CreateI.h"
32
33static void
34FreeBlockHookList(Widget widget _X_UNUSED,
35                  XtPointer closure, /* ActionHook* */
36                  XtPointer call_data _X_UNUSED)
37{
38    BlockHook list = *(BlockHook *) closure;
39
40    while (list != NULL) {
41        BlockHook next = list->next;
42
43        XtFree((XtPointer) list);
44        list = next;
45    }
46}
47
48XtBlockHookId
49XtAppAddBlockHook(XtAppContext app, XtBlockHookProc proc, XtPointer closure)
50{
51    BlockHook hook = XtNew(BlockHookRec);
52
53    LOCK_APP(app);
54    hook->next = app->block_hook_list;
55    hook->app = app;
56    hook->proc = proc;
57    hook->closure = closure;
58    if (app->block_hook_list == NULL) {
59        _XtAddCallback(&app->destroy_callbacks,
60                       FreeBlockHookList, (XtPointer) &app->block_hook_list);
61    }
62    app->block_hook_list = hook;
63    UNLOCK_APP(app);
64    return (XtBlockHookId) hook;
65}
66
67void
68XtRemoveBlockHook(XtBlockHookId id)
69{
70    BlockHook *p, hook = (BlockHook) id;
71    XtAppContext app = hook->app;
72
73    LOCK_APP(app);
74    for (p = &app->block_hook_list; p != NULL && *p != hook; p = &(*p)->next);
75    if (p == NULL) {
76#ifdef DEBUG
77        XtAppWarningMsg(app, "badId", "xtRemoveBlockHook", XtCXtToolkitError,
78                        "XtRemoveBlockHook called with bad or old hook id",
79                        NULL, NULL);
80#endif   /*DEBUG*/
81            UNLOCK_APP(app);
82        return;
83    }
84    *p = hook->next;
85    XtFree((XtPointer) hook);
86    UNLOCK_APP(app);
87}
88
89static void
90DeleteShellFromHookObj(Widget shell,
91                       XtPointer closure,
92                       XtPointer call_data _X_UNUSED)
93{
94    /* app_con is locked when this function is called */
95    Cardinal ii, jj;
96    HookObject ho = (HookObject) closure;
97
98    for (ii = 0; ii < ho->hooks.num_shells; ii++)
99        if (ho->hooks.shells[ii] == shell) {
100            /* collapse the list */
101            for (jj = ii; jj < ho->hooks.num_shells; jj++) {
102                if ((jj + 1) < ho->hooks.num_shells)
103                    ho->hooks.shells[jj] = ho->hooks.shells[jj + 1];
104            }
105            break;
106        }
107    ho->hooks.num_shells--;
108}
109
110#define SHELL_INCR 4
111
112void
113_XtAddShellToHookObj(Widget shell)
114{
115    /* app_con is locked when this function is called */
116    HookObject ho = (HookObject) XtHooksOfDisplay(XtDisplay(shell));
117
118    if (ho->hooks.num_shells == ho->hooks.max_shells) {
119        ho->hooks.max_shells += SHELL_INCR;
120        ho->hooks.shells =
121            (WidgetList) XtRealloc((char *) ho->hooks.shells,
122                                   (Cardinal) (ho->hooks.max_shells *
123                                               sizeof(Widget)));
124    }
125    ho->hooks.shells[ho->hooks.num_shells++] = shell;
126
127    XtAddCallback(shell, XtNdestroyCallback, DeleteShellFromHookObj,
128                  (XtPointer) ho);
129}
130
131Boolean
132_XtIsHookObject(Widget widget)
133{
134    return (widget->core.widget_class == hookObjectClass);
135}
136
137Widget
138XtHooksOfDisplay(Display *dpy)
139{
140    Widget retval;
141    XtPerDisplay pd;
142
143    DPY_TO_APPCON(dpy);
144
145    LOCK_APP(app);
146    pd = _XtGetPerDisplay(dpy);
147    if (pd->hook_object == NULL)
148        pd->hook_object =
149            _XtCreateHookObj((Screen *) DefaultScreenOfDisplay(dpy));
150    retval = pd->hook_object;
151    UNLOCK_APP(app);
152    return retval;
153}
154