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     */
  76     if (focus_cycle_target == client)
  77         focus_cycle(TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE);
  78 }
  79
  80 /*! Returns if a focus target has valid group siblings that can be cycled
  81   to in its place */
  82 static gboolean focus_target_has_siblings(ObClient *ft,
  83                                           gboolean iconic_windows,
  84                                           gboolean all_desktops)
  85
  86 {
  87     GSList *it;
  88
  89     if (!ft->group) return FALSE;
  90
  91     for (it = ft->group->members; it; it = g_slist_next(it)) {
  92         ObClient *c = it->data;
  93         /* check that it's not a helper window to avoid infinite recursion */
  94         if (c != ft && !client_helper(c) &&
  95             focus_cycle_target_valid(c, iconic_windows, all_desktops, FALSE,
  96                                      FALSE))
  97         {
  98             return TRUE;
  99         }
 100     }
 101     return FALSE;
 102 }
 103
 104 gboolean focus_cycle_target_valid(ObClient *ft,
 105                                   gboolean iconic_windows,
 106                                   gboolean all_desktops,
 107                                   gboolean dock_windows,
 108                                   gboolean desktop_windows)
 109 {
 110     gboolean ok = FALSE;
 111
 112     /* it's on this desktop unless you want all desktops.
 113
 114        do this check first because it will usually filter out the most
 115        windows */
 116     ok = (all_desktops || ft->desktop == screen_desktop ||
 117           ft->desktop == DESKTOP_ALL);
 118
 119     /* the window can receive focus somehow */
 120     ok = ok && (ft->can_focus || ft->focus_notify);
 121
 122     /* the window is not iconic, or we're allowed to go to iconic ones */
 123     ok = ok && (iconic_windows || !ft->iconic);
 124
 125     /* it's the right type of window */
 126     if (dock_windows || desktop_windows)
 127         ok = ok && ((dock_windows && ft->type == OB_CLIENT_TYPE_DOCK) ||
 128                     (desktop_windows && ft->type == OB_CLIENT_TYPE_DESKTOP));
 129     /* modal windows are important and can always get focus if they are
 130        visible and stuff, so don't change 'ok' based on their type */
 131     else if (!ft->modal)
 132         /* normal non-helper windows are valid targets */
 133         ok = ok &&
 134             ((client_normal(ft) && !client_helper(ft))
 135              ||
 136              /* helper windows are valid targets it... */
 137              (client_helper(ft) &&
 138               /* ...a window in its group already has focus ... */
 139               ((focus_client && ft->group == focus_client->group) ||
 140                /* ... or if there are no other windows in its group
 141                   that can be cycled to instead */
 142                !focus_target_has_siblings(ft, iconic_windows, all_desktops))));
 143
 144     /* it's not set to skip the taskbar (unless it is a type that would be
 145        expected to set this hint, or modal) */
 146     ok = ok && ((ft->type == OB_CLIENT_TYPE_DOCK ||
 147                  ft->type == OB_CLIENT_TYPE_DESKTOP ||
 148                  ft->type == OB_CLIENT_TYPE_TOOLBAR ||
 149                  ft->type == OB_CLIENT_TYPE_MENU ||
 150                  ft->type == OB_CLIENT_TYPE_UTILITY) ||
 151                 ft->modal ||
 152                 !ft->skip_taskbar);
 153
 154     /* it's not going to just send fous off somewhere else (modal window) */
 155     ok = ok && ft == client_focus_target(ft);
 156
 157     return ok;
 158 }
 159
 160 void focus_cycle(gboolean forward, gboolean all_desktops,
 161                  gboolean dock_windows, gboolean desktop_windows,
 162                  gboolean linear, gboolean interactive,
 163                  gboolean dialog, gboolean done, gboolean cancel)
 164 {
 165     static ObClient *first = NULL;
 166     static ObClient *t = NULL;
 167     static GList *order = NULL;
 168     GList *it, *start, *list;
 169     ObClient *ft = NULL;
 170
 171     if (interactive) {
 172         if (cancel) {
 173             focus_cycle_target = NULL;
 174             goto done_cycle;
 175         } else if (done)
 176             goto done_cycle;
 177
 178         if (!focus_order)
 179             goto done_cycle;
 180
 181         if (!first) first = focus_client;
 182
 183         if (linear) list = client_list;
 184         else        list = focus_order;
 185     } else {
 186         if (!focus_order)
 187             goto done_cycle;
 188         list = client_list;
 189     }
 190     if (!focus_cycle_target) focus_cycle_target = focus_client;
 191
 192     start = it = g_list_find(list, focus_cycle_target);
 193     if (!start) /* switched desktops or something? */
 194         start = it = forward ? g_list_last(list) : g_list_first(list);
 195     if (!start) goto done_cycle;
 196
 197     do {
 198         if (forward) {
 199             it = it->next;
 200             if (it == NULL) it = g_list_first(list);
 201         } else {
 202             it = it->prev;
 203             if (it == NULL) it = g_list_last(list);
 204         }
 205         ft = it->data;
 206         if (focus_cycle_target_valid(ft, TRUE,
 207                                      all_desktops, dock_windows,
 208                                      desktop_windows))
 209         {
 210             if (interactive) {
 211                 if (ft != focus_cycle_target) { /* prevents flicker */
 212                     focus_cycle_target = ft;
 213                     focus_cycle_draw_indicator(ft);
 214                 }
 215                 if (dialog)
 216                     /* same arguments as focus_target_valid */
 217                     focus_cycle_popup_show(ft, TRUE,
 218                                            all_desktops, dock_windows,
 219                                            desktop_windows);
 220                 return;
 221             } else if (ft != focus_cycle_target) {
 222                 focus_cycle_target = ft;
 223                 done = TRUE;
 224                 break;
 225             }
 226         }
 227     } while (it != start);
 228
 229 done_cycle:
 230     if (done && focus_cycle_target)
 231         client_activate(focus_cycle_target, FALSE, TRUE);
 232
 233     t = NULL;
 234     first = NULL;
 235     focus_cycle_target = NULL;
 236     g_list_free(order);
 237     order = NULL;
 238
 239     if (interactive) {
 240         focus_cycle_draw_indicator(NULL);
 241         focus_cycle_popup_hide();
 242     }
 243
 244     return;
 245 }
 246
 247 /* this be mostly ripped from fvwm */
 248 static ObClient *focus_find_directional(ObClient *c, ObDirection dir,
 249                                         gboolean dock_windows,
 250                                         gboolean desktop_windows)
 251 {
 252     gint my_cx, my_cy, his_cx, his_cy;
 253     gint offset = 0;
 254     gint distance = 0;
 255     gint score, best_score;
 256     ObClient *best_client, *cur;
 257     GList *it;
 258
 259     if(!client_list)
 260         return NULL;
 261
 262     /* first, find the centre coords of the currently focused window */
 263     my_cx = c->frame->area.x + c->frame->area.width / 2;
 264     my_cy = c->frame->area.y + c->frame->area.height / 2;
 265
 266     best_score = -1;
 267     best_client = NULL;
 268
 269     for(it = g_list_first(client_list); it; it = g_list_next(it)) {
 270         cur = it->data;
 271
 272         /* the currently selected window isn't interesting */
 273         if(cur == c)
 274             continue;
 275         if (!focus_cycle_target_valid(it->data, FALSE, FALSE, dock_windows,
 276                                       desktop_windows))
 277             continue;
 278
 279         /* find the centre coords of this window, from the
 280          * currently focused window's point of view */
 281         his_cx = (cur->frame->area.x - my_cx)
 282             + cur->frame->area.width / 2;
 283         his_cy = (cur->frame->area.y - my_cy)
 284             + cur->frame->area.height / 2;
 285
 286         if(dir == OB_DIRECTION_NORTHEAST || dir == OB_DIRECTION_SOUTHEAST ||
 287            dir == OB_DIRECTION_SOUTHWEST || dir == OB_DIRECTION_NORTHWEST) {
 288             gint tx;
 289             /* Rotate the diagonals 45 degrees counterclockwise.
 290              * To do this, multiply the matrix /+h +h\ with the
 291              * vector (x y).                   \-h +h/
 292              * h = sqrt(0.5). We can set h := 1 since absolute
 293              * distance doesn't matter here. */
 294             tx = his_cx + his_cy;
 295             his_cy = -his_cx + his_cy;
 296             his_cx = tx;
 297         }
 298
 299         switch(dir) {
 300         case OB_DIRECTION_NORTH:
 301         case OB_DIRECTION_SOUTH:
 302         case OB_DIRECTION_NORTHEAST:
 303         case OB_DIRECTION_SOUTHWEST:
 304             offset = (his_cx < 0) ? -his_cx : his_cx;
 305             distance = ((dir == OB_DIRECTION_NORTH ||
 306                          dir == OB_DIRECTION_NORTHEAST) ?
 307                         -his_cy : his_cy);
 308             break;
 309         case OB_DIRECTION_EAST:
 310         case OB_DIRECTION_WEST:
 311         case OB_DIRECTION_SOUTHEAST:
 312         case OB_DIRECTION_NORTHWEST:
 313             offset = (his_cy < 0) ? -his_cy : his_cy;
 314             distance = ((dir == OB_DIRECTION_WEST ||
 315                          dir == OB_DIRECTION_NORTHWEST) ?
 316                         -his_cx : his_cx);
 317             break;
 318         }
 319
 320         /* the target must be in the requested direction */
 321         if(distance <= 0)
 322             continue;
 323
 324         /* Calculate score for this window.  The smaller the better. */
 325         score = distance + offset;
 326
 327         /* windows more than 45 degrees off the direction are
 328          * heavily penalized and will only be chosen if nothing
 329          * else within a million pixels */
 330         if(offset > distance)
 331             score += 1000000;
 332
 333         if(best_score == -1 || score < best_score)
 334             best_client = cur,
 335                 best_score = score;
 336     }
 337
 338     return best_client;
 339 }
 340
 341 void focus_directional_cycle(ObDirection dir, gboolean dock_windows,
 342                              gboolean desktop_windows, gboolean interactive,
 343                              gboolean dialog, gboolean done, gboolean cancel)
 344 {
 345     static ObClient *first = NULL;
 346     ObClient *ft = NULL;
 347
 348     if (!interactive)
 349         return;
 350
 351     if (cancel) {
 352         focus_cycle_target = NULL;
 353         goto done_cycle;
 354     } else if (done)
 355         goto done_cycle;
 356
 357     if (!focus_order)
 358         goto done_cycle;
 359
 360     if (!first) first = focus_client;
 361     if (!focus_cycle_target) focus_cycle_target = focus_client;
 362
 363     if (focus_cycle_target)
 364         ft = focus_find_directional(focus_cycle_target, dir, dock_windows,
 365                                     desktop_windows);
 366     else {
 367         GList *it;
 368
 369         for (it = focus_order; it; it = g_list_next(it))
 370             if (focus_cycle_target_valid(it->data, FALSE, FALSE, dock_windows,
 371                                          desktop_windows))
 372                 ft = it->data;
 373     }
 374
 375     if (ft) {
 376         if (ft != focus_cycle_target) {/* prevents flicker */
 377             focus_cycle_target = ft;
 378             focus_cycle_draw_indicator(ft);
 379         }
 380     }
 381     if (focus_cycle_target && dialog) {
 382         /* same arguments as focus_target_valid */
 383         focus_cycle_popup_single_show(focus_cycle_target,
 384                                       FALSE, FALSE, dock_windows,
 385                                       desktop_windows);
 386         return;
 387     }
 388
 389 done_cycle:
 390     if (done && focus_cycle_target)
 391         client_activate(focus_cycle_target, FALSE, TRUE);
 392
 393     first = NULL;
 394     focus_cycle_target = NULL;
 395
 396     focus_cycle_draw_indicator(NULL);
 397     focus_cycle_popup_single_hide();
 398
 399     return;
 400 }