IABSD.fr/xenocara/lib/libXt/src/Hooks.c

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• Author : matthieu
  Date : 2006-11-25 18:01:46
  Hash : 799832a0
  Message : import from X.Org 7.2RC2

• lib/libXt/src/Hooks.c

• /* $Xorg: Hooks.c,v 1.4 2001/02/09 02:03:55 xorgcvs Exp $ */
  
  /*
  
  Copyright 1994, 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/Xt/Hooks.c,v 1.3 2001/12/14 19:56:18 dawes Exp $ */
  
  /*LINTLIBRARY*/
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  #include "IntrinsicI.h"
  #include "CreateI.h"
  
  static void FreeBlockHookList(
      Widget widget,		/* unused (and invalid) */
      XtPointer closure,		/* ActionHook* */
      XtPointer call_data)	/* unused */
  {
      BlockHook list = *(BlockHook*)closure;
      while (list != NULL) {
  	BlockHook next = list->next;
  	XtFree( (XtPointer)list );
  	list = next;
      }
  }
  
  
  XtBlockHookId XtAppAddBlockHook(
      XtAppContext app,
      XtBlockHookProc proc,
      XtPointer closure)
  {
      BlockHook hook = XtNew(BlockHookRec);
      LOCK_APP(app);
      hook->next = app->block_hook_list;
      hook->app = app;
      hook->proc = proc;
      hook->closure = closure;
      if (app->block_hook_list == NULL) {
  	_XtAddCallback( &app->destroy_callbacks,
  		        FreeBlockHookList,
  		        (XtPointer)&app->block_hook_list
  		      );
      }
      app->block_hook_list = hook;
      UNLOCK_APP(app);
      return (XtBlockHookId)hook;
  }
  
  
  void XtRemoveBlockHook(
      XtBlockHookId id)
  {
      BlockHook *p, hook = (BlockHook)id;
      XtAppContext app = hook->app;
      LOCK_APP(app);
      for (p = &app->block_hook_list; p != NULL && *p != hook; p = &(*p)->next);
      if (p == NULL) {
  #ifdef DEBUG
  	XtAppWarningMsg(app, "badId", "xtRemoveBlockHook", XtCXtToolkitError,
  			"XtRemoveBlockHook called with bad or old hook id",
  			(String*)NULL, (Cardinal*)NULL);
  #endif /*DEBUG*/
  	UNLOCK_APP(app);
  	return;
      }
      *p = hook->next;
      XtFree( (XtPointer)hook );
      UNLOCK_APP(app);
  }
  
  static void DeleteShellFromHookObj(
      Widget shell,
      XtPointer closure,
      XtPointer call_data)
  {
      /* app_con is locked when this function is called */
      Cardinal ii, jj;
      HookObject ho = (HookObject) closure;
  
      for (ii = 0; ii < ho->hooks.num_shells; ii++)
  	if (ho->hooks.shells[ii] == shell) {
  	    /* collapse the list */
  	    for (jj = ii; jj < ho->hooks.num_shells; jj++) {
  		if ((jj+1) < ho->hooks.num_shells)
  		    ho->hooks.shells[jj] = ho->hooks.shells[jj+1];
  	    }
  	    break;
  	}
      ho->hooks.num_shells--;
  }
  
  #define SHELL_INCR 4
  
  void _XtAddShellToHookObj(
      Widget shell)
  {
      /* app_con is locked when this function is called */
      HookObject ho = (HookObject) XtHooksOfDisplay(XtDisplay(shell));
  
      if (ho->hooks.num_shells == ho->hooks.max_shells) {
  	ho->hooks.max_shells += SHELL_INCR;
  	ho->hooks.shells =
  	    (WidgetList)XtRealloc((char*)ho->hooks.shells,
  		ho->hooks.max_shells * sizeof (Widget));
      }
      ho->hooks.shells[ho->hooks.num_shells++] = shell;
  
      XtAddCallback(shell, XtNdestroyCallback, DeleteShellFromHookObj,
  		  (XtPointer)ho);
  }
  
  Boolean _XtIsHookObject(
      Widget widget)
  {
      return (widget->core.widget_class == hookObjectClass);
  }
  
  Widget XtHooksOfDisplay(
      Display* dpy)
  {
      Widget retval;
      XtPerDisplay pd;
      DPY_TO_APPCON(dpy);
  
      LOCK_APP(app);
      pd = _XtGetPerDisplay(dpy);
      if (pd->hook_object == NULL)
  	pd->hook_object =
  	    _XtCreateHookObj((Screen*)DefaultScreenOfDisplay(dpy));
      retval = pd->hook_object;
      UNLOCK_APP(app);
      return retval;
  }