Dogcows Code - chaz/openbox/blob - openbox/focus_cycle.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    focus_cycle.c for the Openbox window manager
   4    Copyright (c) 2006        Mikael Magnusson
   5    Copyright (c) 2003-2007   Dana Jansens
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    See the COPYING file for a copy of the GNU General Public License.
  18 */
  19
  20 #include "focus_cycle.h"
  21 #include "focus_cycle_indicator.h"
  22 #include "focus_cycle_popup.h"
  23 #include "client.h"
  24 #include "frame.h"
  25 #include "focus.h"
  26 #include "screen.h"
  27 #include "openbox.h"
  28 #include "debug.h"
  29 #include "group.h"
  30
  31 #include <X11/Xlib.h>
  32 #include <glib.h>
  33
  34 ObClient     *focus_cycle_target = NULL;
  35
  36 static void      focus_cycle_destroy_notify (ObClient *client, gpointer data);
  37 static gboolean  focus_target_has_siblings  (ObClient *ft,
  38                                              gboolean iconic_windows,
  39                                              gboolean all_desktops);
  40 static ObClient *focus_find_directional    (ObClient *c,
  41                                             ObDirection dir,
  42                                             gboolean dock_windows,
  43                                             gboolean desktop_windows);
  44 static ObClient *focus_find_directional    (ObClient *c,
  45                                             ObDirection dir,
  46                                             gboolean dock_windows,
  47                                             gboolean desktop_windows);
  48
  49 void focus_cycle_startup(gboolean reconfig)
  50 {
  51     if (reconfig) return;
  52
  53     client_add_destroy_notify(focus_cycle_destroy_notify, NULL);
  54 }
  55
  56 void focus_cycle_shutdown(gboolean reconfig)
  57 {
  58     if (reconfig) return;
  59
  60     client_remove_destroy_notify(focus_cycle_destroy_notify);
  61 }
  62
  63 void focus_cycle_stop()
  64 {
  65     if (focus_cycle_target) {
  66         focus_cycle(TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE);
  67         focus_directional_cycle(0, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE);
  68     }
  69 }
  70
  71 static void focus_cycle_destroy_notify(ObClient *client, gpointer data)
  72 {
  73     /* end cycling if the target disappears. CurrentTime is fine, time won't
  74        be used */
  75     if (focus_cycle_target == client)
  76         focus_cycle_stop();
  77 }
  78
  79 /*! Returns if a focus target has valid group siblings that can be cycled
  80   to in its place */
  81 static gboolean focus_target_has_siblings(ObClient *ft,
  82                                           gboolean iconic_windows,
  83                                           gboolean all_desktops)
  84
  85 {
  86     GSList *it;
  87
  88     if (!ft->group) return FALSE;
  89
  90     for (it = ft->group->members; it; it = g_slist_next(it)) {
  91         ObClient *c = it->data;
  92         /* check that it's not a helper window to avoid infinite recursion */
  93         if (c != ft && !client_helper(c) &&
  94             focus_cycle_target_valid(c, iconic_windows, all_desktops, FALSE,
  95                                      FALSE))
  96         {
  97             return TRUE;
  98         }
  99     }
 100     return FALSE;
 101 }
 102
 103 gboolean focus_cycle_target_valid(ObClient *ft,
 104                                   gboolean iconic_windows,
 105                                   gboolean all_desktops,
 106                                   gboolean dock_windows,
 107                                   gboolean desktop_windows)
 108 {
 109     gboolean ok = FALSE;
 110
 111     /* it's on this desktop unless you want all desktops.
 112
 113        do this check first because it will usually filter out the most
 114        windows */
 115     ok = (all_desktops || ft->desktop == screen_desktop ||
 116           ft->desktop == DESKTOP_ALL);
 117
 118     /* the window can receive focus somehow */
 119     ok = ok && (ft->can_focus || ft->focus_notify);
 120
 121     /* the window is not iconic, or we're allowed to go to iconic ones */
 122     ok = ok && (iconic_windows || !ft->iconic);
 123
 124     /* it's the right type of window */
 125     if (dock_windows || desktop_windows)
 126         ok = ok && ((dock_windows && ft->type == OB_CLIENT_TYPE_DOCK) ||
 127                     (desktop_windows && ft->type == OB_CLIENT_TYPE_DESKTOP));
 128     /* modal windows are important and can always get focus if they are
 129        visible and stuff, so don't change 'ok' based on their type */
 130     else if (!ft->modal)
 131         /* normal non-helper windows are valid targets */
 132         ok = ok &&
 133             ((client_normal(ft) && !client_helper(ft))
 134              ||
 135              /* helper windows are valid targets it... */
 136              (client_helper(ft) &&
 137               /* ...a window in its group already has focus ... */
 138               ((focus_client && ft->group == focus_client->group) ||
 139                /* ... or if there are no other windows in its group
 140                   that can be cycled to instead */
 141                !focus_target_has_siblings(ft, iconic_windows, all_desktops))));
 142
 143     /* it's not set to skip the taskbar (unless it is a type that would be
 144        expected to set this hint, or modal) */
 145     ok = ok && ((ft->type == OB_CLIENT_TYPE_DOCK ||
 146                  ft->type == OB_CLIENT_TYPE_DESKTOP ||
 147                  ft->type == OB_CLIENT_TYPE_TOOLBAR ||
 148                  ft->type == OB_CLIENT_TYPE_MENU ||
 149                  ft->type == OB_CLIENT_TYPE_UTILITY) ||
 150                 ft->modal ||
 151                 !ft->skip_taskbar);
 152
 153     /* it's not going to just send fous off somewhere else (modal window) */
 154     ok = ok && ft == client_focus_target(ft);
 155
 156     return ok;
 157 }
 158
 159 void focus_cycle(gboolean forward, gboolean all_desktops,
 160                  gboolean dock_windows, gboolean desktop_windows,
 161                  gboolean linear, gboolean interactive,
 162                  gboolean dialog, gboolean done, gboolean cancel)
 163 {
 164     static ObClient *first = NULL;
 165     static ObClient *t = NULL;
 166     static GList *order = NULL;
 167     GList *it, *start, *list;
 168     ObClient *ft = NULL;
 169
 170     if (interactive) {
 171         if (cancel) {
 172             focus_cycle_target = NULL;
 173             goto done_cycle;
 174         } else if (done)
 175             goto done_cycle;
 176
 177         if (!focus_order)
 178             goto done_cycle;
 179
 180         if (!first) first = focus_client;
 181
 182         if (linear) list = client_list;
 183         else        list = focus_order;
 184     } else {
 185         if (!focus_order)
 186             goto done_cycle;
 187         list = client_list;
 188     }
 189     if (!focus_cycle_target) focus_cycle_target = focus_client;
 190
 191     start = it = g_list_find(list, focus_cycle_target);
 192     if (!start) /* switched desktops or something? */
 193         start = it = forward ? g_list_last(list) : g_list_first(list);
 194     if (!start) goto done_cycle;
 195
 196     do {
 197         if (forward) {
 198             it = it->next;
 199             if (it == NULL) it = g_list_first(list);
 200         } else {
 201             it = it->prev;
 202             if (it == NULL) it = g_list_last(list);
 203         }
 204         ft = it->data;
 205         if (focus_cycle_target_valid(ft, TRUE,
 206                                      all_desktops, dock_windows,
 207                                      desktop_windows))
 208         {
 209             if (interactive) {
 210                 if (ft != focus_cycle_target) { /* prevents flicker */
 211                     focus_cycle_target = ft;
 212                     focus_cycle_draw_indicator(ft);
 213                 }
 214                 if (dialog)
 215                     /* same arguments as focus_target_valid */
 216                     focus_cycle_popup_show(ft, TRUE,
 217                                            all_desktops, dock_windows,
 218                                            desktop_windows);
 219                 return;
 220             } else if (ft != focus_cycle_target) {
 221                 focus_cycle_target = ft;
 222                 done = TRUE;
 223                 break;
 224             }
 225         }
 226     } while (it != start);
 227
 228 done_cycle:
 229     if (done && focus_cycle_target)
 230         client_activate(focus_cycle_target, FALSE, TRUE);
 231
 232     t = NULL;
 233     first = NULL;
 234     focus_cycle_target = NULL;
 235     g_list_free(order);
 236     order = NULL;
 237
 238     if (interactive) {
 239         focus_cycle_draw_indicator(NULL);
 240         focus_cycle_popup_hide();
 241     }
 242
 243     return;
 244 }
 245
 246 /* this be mostly ripped from fvwm */
 247 static ObClient *focus_find_directional(ObClient *c, ObDirection dir,
 248                                         gboolean dock_windows,
 249                                         gboolean desktop_windows)
 250 {
 251     gint my_cx, my_cy, his_cx, his_cy;
 252     gint offset = 0;
 253     gint distance = 0;
 254     gint score, best_score;
 255     ObClient *best_client, *cur;
 256     GList *it;
 257
 258     if(!client_list)
 259         return NULL;
 260
 261     /* first, find the centre coords of the currently focused window */
 262     my_cx = c->frame->area.x + c->frame->area.width / 2;
 263     my_cy = c->frame->area.y + c->frame->area.height / 2;
 264
 265     best_score = -1;
 266     best_client = NULL;
 267
 268     for(it = g_list_first(client_list); it; it = g_list_next(it)) {
 269         cur = it->data;
 270
 271         /* the currently selected window isn't interesting */
 272         if(cur == c)
 273             continue;
 274         if (!focus_cycle_target_valid(it->data, FALSE, FALSE, dock_windows,
 275                                       desktop_windows))
 276             continue;
 277
 278         /* find the centre coords of this window, from the
 279          * currently focused window's point of view */
 280         his_cx = (cur->frame->area.x - my_cx)
 281             + cur->frame->area.width / 2;
 282         his_cy = (cur->frame->area.y - my_cy)
 283             + cur->frame->area.height / 2;
 284
 285         if(dir == OB_DIRECTION_NORTHEAST || dir == OB_DIRECTION_SOUTHEAST ||
 286            dir == OB_DIRECTION_SOUTHWEST || dir == OB_DIRECTION_NORTHWEST) {
 287             gint tx;
 288             /* Rotate the diagonals 45 degrees counterclockwise.
 289              * To do this, multiply the matrix /+h +h\ with the
 290              * vector (x y).                   \-h +h/
 291              * h = sqrt(0.5). We can set h := 1 since absolute
 292              * distance doesn't matter here. */
 293             tx = his_cx + his_cy;
 294             his_cy = -his_cx + his_cy;
 295             his_cx = tx;
 296         }
 297
 298         switch(dir) {
 299         case OB_DIRECTION_NORTH:
 300         case OB_DIRECTION_SOUTH:
 301         case OB_DIRECTION_NORTHEAST:
 302         case OB_DIRECTION_SOUTHWEST:
 303             offset = (his_cx < 0) ? -his_cx : his_cx;
 304             distance = ((dir == OB_DIRECTION_NORTH ||
 305                          dir == OB_DIRECTION_NORTHEAST) ?
 306                         -his_cy : his_cy);
 307             break;
 308         case OB_DIRECTION_EAST:
 309         case OB_DIRECTION_WEST:
 310         case OB_DIRECTION_SOUTHEAST:
 311         case OB_DIRECTION_NORTHWEST:
 312             offset = (his_cy < 0) ? -his_cy : his_cy;
 313             distance = ((dir == OB_DIRECTION_WEST ||
 314                          dir == OB_DIRECTION_NORTHWEST) ?
 315                         -his_cx : his_cx);
 316             break;
 317         }
 318
 319         /* the target must be in the requested direction */
 320         if(distance <= 0)
 321             continue;
 322
 323         /* Calculate score for this window.  The smaller the better. */
 324         score = distance + offset;
 325
 326         /* windows more than 45 degrees off the direction are
 327          * heavily penalized and will only be chosen if nothing
 328          * else within a million pixels */
 329         if(offset > distance)
 330             score += 1000000;
 331
 332         if(best_score == -1 || score < best_score)
 333             best_client = cur,
 334                 best_score = score;
 335     }
 336
 337     return best_client;
 338 }
 339
 340 void focus_directional_cycle(ObDirection dir, gboolean dock_windows,
 341                              gboolean desktop_windows, gboolean interactive,
 342                              gboolean dialog, gboolean done, gboolean cancel)
 343 {
 344     static ObClient *first = NULL;
 345     ObClient *ft = NULL;
 346
 347     if (!interactive)
 348         return;
 349
 350     if (cancel) {
 351         focus_cycle_target = NULL;
 352         goto done_cycle;
 353     } else if (done)
 354         goto done_cycle;
 355
 356     if (!focus_order)
 357         goto done_cycle;
 358
 359     if (!first) first = focus_client;
 360     if (!focus_cycle_target) focus_cycle_target = focus_client;
 361
 362     if (focus_cycle_target)
 363         ft = focus_find_directional(focus_cycle_target, dir, dock_windows,
 364                                     desktop_windows);
 365     else {
 366         GList *it;
 367
 368         for (it = focus_order; it; it = g_list_next(it))
 369             if (focus_cycle_target_valid(it->data, FALSE, FALSE, dock_windows,
 370                                          desktop_windows))
 371                 ft = it->data;
 372     }
 373
 374     if (ft) {
 375         if (ft != focus_cycle_target) {/* prevents flicker */
 376             focus_cycle_target = ft;
 377             focus_cycle_draw_indicator(ft);
 378         }
 379     }
 380     if (focus_cycle_target && dialog) {
 381         /* same arguments as focus_target_valid */
 382         focus_cycle_popup_single_show(focus_cycle_target,
 383                                       FALSE, FALSE, dock_windows,
 384                                       desktop_windows);
 385         return;
 386     }
 387
 388 done_cycle:
 389     if (done && focus_cycle_target)
 390         client_activate(focus_cycle_target, FALSE, TRUE);
 391
 392     first = NULL;
 393     focus_cycle_target = NULL;
 394
 395     focus_cycle_draw_indicator(NULL);
 396     focus_cycle_popup_single_hide();
 397
 398     return;
 399 }