ioncore/attach.c

   1 /*
   2  * ion/ioncore/attach.c
   3  *
   4  * Copyright (c) Tuomo Valkonen 1999-2009.
   5  *
   6  * See the included file LICENSE for details.
   7  */
   8
   9 #include <string.h>
  10 #include <limits.h>
  11
  12 #include "common.h"
  13 #include "global.h"
  14 #include "region.h"
  15 #include "attach.h"
  16 #include "clientwin.h"
  17 #include "saveload.h"
  18 #include "manage.h"
  19 #include "extlconv.h"
  20 #include "names.h"
  21 #include "focus.h"
  22
  23
  24 /*{{{ Helper */
  25
  26
  27 static WRegion *doit_new(WRegion *mgr,
  28                          WWindow *par, const WFitParams *fp,
  29                          WRegionDoAttachFn *cont, void *cont_param,
  30                          WRegionCreateFn *fn, void *fn_param)
  31 {
  32     WRegion *reg=fn(par, fp, fn_param);
  33
  34     if(reg==NULL)
  35         return NULL;
  36
  37     if(!cont(mgr, reg, cont_param)){
  38         destroy_obj((Obj*)reg);
  39         return NULL;
  40     }
  41
  42     return reg;
  43 }
  44
  45
  46 static WRegion *doit_reparent(WRegion *mgr,
  47                               WWindow *par, const WFitParams *fp,
  48                               WRegionDoAttachFn *cont, void *cont_param,
  49                               WRegion *reg)
  50 {
  51     WFitParams fp2;
  52     WRegion *disposeroot;
  53
  54     if(!region_ancestor_check(mgr, reg)){
  55         warn(TR("Attempt to make region %s manage its ancestor %s."),
  56              region_name(mgr), region_name(reg));
  57         return NULL;
  58     }
  59
  60     disposeroot=region_disposeroot(reg);
  61
  62     if(disposeroot==NULL){
  63         /* Region may not be reparented */
  64         return NULL;
  65     }
  66
  67     if(fp->mode&REGION_FIT_WHATEVER){
  68         /* fp->g is not final; substitute size with current to avoid
  69          * useless resizing.
  70          */
  71         fp2.mode=fp->mode;
  72         fp2.g.x=fp->g.x;
  73         fp2.g.y=fp->g.y;
  74         fp2.g.w=REGION_GEOM(reg).w;
  75         fp2.g.h=REGION_GEOM(reg).h;
  76         fp=&fp2;
  77     }
  78
  79     if(!region_fitrep(reg, par, fp)){
  80         warn(TR("Unable to reparent."));
  81         return NULL;
  82     }
  83
  84     region_detach_manager(reg);
  85
  86     if(!cont(mgr, reg, cont_param)){
  87         WScreen *scr=region_screen_of(reg);
  88
  89         warn(TR("Unexpected attach error: "
  90                 "trying to recover by attaching to screen."));
  91
  92         if(scr!=NULL){
  93             /* Try to attach to screen, to have `reg` attached at least
  94              * somewhere. For better recovery, we could try to get
  95              * a placeholder for `reg` before we detach it, but this
  96              * would add unnecessary overhead in the usual succesfull
  97              * case. (This failure is supposed to be _very_ rare!)
  98              * We intentionally also do not region_postdetach_dispose
  99              * on recovery.
 100              */
 101             int flags=(region_may_control_focus(reg)
 102                        ? MPLEX_ATTACH_SWITCHTO
 103                        : 0);
 104             if(mplex_attach_simple(&scr->mplex, reg, flags)!=NULL)
 105                 return NULL;
 106         }
 107
 108         warn(TR("Failed recovery."));
 109
 110         return NULL;
 111     }
 112
 113     region_postdetach_dispose(reg, disposeroot);
 114
 115     return reg;
 116 }
 117
 118
 119 typedef struct{
 120     ExtlTab tab;
 121     WPHolder **sm_ph_p;
 122 } WLP;
 123
 124 static WRegion *wrap_load(WWindow *par, const WFitParams *fp, WLP *p)
 125 {
 126     return create_region_load(par, fp, p->tab, p->sm_ph_p);
 127 }
 128
 129
 130 WRegion *ioncore_newly_created=NULL;
 131
 132
 133 static WRegion *doit_load(WRegion *mgr,
 134                           WWindow *par, const WFitParams *fp,
 135                           WRegionDoAttachFn *cont, void *cont_param,
 136                           ExtlTab tab, WPHolder **sm_ph)
 137 {
 138     WRegion *reg=NULL;
 139
 140     if(extl_table_gets_o(tab, "reg", (Obj**)&reg)){
 141         if(!OBJ_IS(reg, WRegion))
 142             return FALSE;
 143     }/*else if(extl_table_is_bool_set(tab, "reg_use_new")){
 144         reg=ioncore_newly_created;
 145         if(reg==NULL)
 146             return NULL;
 147     }*/
 148
 149     if(reg!=NULL){
 150         return doit_reparent(mgr, par, fp, cont, cont_param, reg);
 151     }else{
 152         WLP p;
 153         p.tab=tab;
 154         p.sm_ph_p=sm_ph;
 155
 156         return doit_new(mgr, par, fp, cont, cont_param,
 157                         (WRegionCreateFn*)wrap_load, &p);
 158     }
 159 }
 160
 161
 162 WRegion *region_attach_load_helper(WRegion *mgr,
 163                                    WWindow *par, const WFitParams *fp,
 164                                    WRegionDoAttachFn *fn, void *fn_param,
 165                                    ExtlTab tab, WPHolder **sm_ph)
 166 {
 167     return doit_load(mgr, par, fp, fn, fn_param, tab, sm_ph);
 168 }
 169
 170
 171 WRegion *region_attach_helper(WRegion *mgr,
 172                               WWindow *par, const WFitParams *fp,
 173                               WRegionDoAttachFn *fn, void *fn_param,
 174                               const WRegionAttachData *data)
 175 {
 176     if(data->type==REGION_ATTACH_NEW){
 177         return doit_new(mgr, par, fp, fn, fn_param,
 178                         data->u.n.fn, data->u.n.param);
 179     }else if(data->type==REGION_ATTACH_LOAD){
 180         return doit_load(mgr, par, fp, fn, fn_param, data->u.tab, NULL);
 181     }else if(data->type==REGION_ATTACH_REPARENT){
 182         return doit_reparent(mgr, par, fp, fn, fn_param, data->u.reg);
 183     }else{
 184         return NULL;
 185     }
 186 }
 187
 188
 189 /*}}}*/
 190
 191
 192 /*{{{ Reparent check etc. */
 193
 194
 195 bool region_ancestor_check(WRegion *dst, WRegion *reg)
 196 {
 197     WRegion *reg2;
 198
 199     /* Check that reg is not a parent or manager of mgr */
 200     for(reg2=dst; reg2!=NULL; reg2=REGION_MANAGER(reg2)){
 201         if(reg2==reg)
 202             return FALSE;
 203     }
 204
 205     for(reg2=REGION_PARENT_REG(dst); reg2!=NULL; reg2=REGION_PARENT_REG(reg2)){
 206         if(reg2==reg)
 207             return FALSE;
 208     }
 209
 210     return TRUE;
 211 }
 212
 213
 214 void region_postdetach_dispose(WRegion *reg, WRegion *disposeroot)
 215 {
 216     /* disposeroot should be destroyed (as empty and useless) unless it
 217      * still, in fact, is an ancestor of reg.
 218      */
 219     if(disposeroot!=reg && region_ancestor_check(reg, disposeroot))
 220         region_dispose(disposeroot);
 221 }
 222
 223
 224 /*}}}*/
 225
 226