openbox/focus_cycle.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    focus.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 "client.h"
  22 #include "focus.h"
  23 #include "screen.h"
  24 #include "openbox.h"
  25 #include "frame.h"
  26 #include "popup.h"
  27 #include "debug.h"
  28 #include "group.h"
  29 #include "event.h"
  30 #include "render/render.h"
  31
  32 #include <X11/Xlib.h>
  33 #include <glib.h>
  34
  35 #define FOCUS_INDICATOR_WIDTH 6
  36
  37 struct {
  38     InternalWindow top;
  39     InternalWindow left;
  40     InternalWindow right;
  41     InternalWindow bottom;
  42 } focus_indicator;
  43
  44 ObClient     *focus_cycle_target = NULL;
  45
  46 static RrAppearance *a_focus_indicator;
  47 static RrColor      *color_white;
  48 static ObIconPopup  *focus_cycle_popup;
  49
  50 static void      focus_cycle_destroy_notify (ObClient *client, gpointer data);
  51 static Window    create_window              (Window parent, gulong mask,
  52                                              XSetWindowAttributes *attrib);
  53 static gboolean  focus_target_valid         (ObClient *ft,
  54                                              gboolean all_desktops,
  55                                              gboolean dock_windows,
  56                                              gboolean desktop_windows);
  57 static gboolean  focus_target_has_siblings  (ObClient *ft,
  58                                              gboolean all_desktops);
  59 static gchar    *popup_get_name             (ObClient *c,
  60                                              ObClient **nametarget);
  61 static void      popup_cycle                (ObClient *c,
  62                                              gboolean show,
  63                                              gboolean all_desktops,
  64                                              gboolean dock_windows,
  65                                              gboolean desktop_windows);
  66 static ObClient *focus_find_directional    (ObClient *c,
  67                                             ObDirection dir,
  68                                             gboolean dock_windows,
  69                                             gboolean desktop_windows);
  70 static ObClient *focus_find_directional    (ObClient *c,
  71                                             ObDirection dir,
  72                                             gboolean dock_windows,
  73                                             gboolean desktop_windows);
  74
  75 void focus_cycle_startup(gboolean reconfig)
  76 {
  77     focus_cycle_popup = icon_popup_new(TRUE);
  78
  79     if (!reconfig) {
  80         XSetWindowAttributes attr;
  81
  82         client_add_destroy_notify(focus_cycle_destroy_notify, NULL);
  83
  84         focus_indicator.top.obwin.type = Window_Internal;
  85         focus_indicator.left.obwin.type = Window_Internal;
  86         focus_indicator.right.obwin.type = Window_Internal;
  87         focus_indicator.bottom.obwin.type = Window_Internal;
  88
  89         attr.override_redirect = True;
  90         attr.background_pixel = BlackPixel(ob_display, ob_screen);
  91         focus_indicator.top.win =
  92             create_window(RootWindow(ob_display, ob_screen),
  93                           CWOverrideRedirect | CWBackPixel, &attr);
  94         focus_indicator.left.win =
  95             create_window(RootWindow(ob_display, ob_screen),
  96                           CWOverrideRedirect | CWBackPixel, &attr);
  97         focus_indicator.right.win =
  98             create_window(RootWindow(ob_display, ob_screen),
  99                           CWOverrideRedirect | CWBackPixel, &attr);
 100         focus_indicator.bottom.win =
 101             create_window(RootWindow(ob_display, ob_screen),
 102                           CWOverrideRedirect | CWBackPixel, &attr);
 103
 104         stacking_add(INTERNAL_AS_WINDOW(&focus_indicator.top));
 105         stacking_add(INTERNAL_AS_WINDOW(&focus_indicator.left));
 106         stacking_add(INTERNAL_AS_WINDOW(&focus_indicator.right));
 107         stacking_add(INTERNAL_AS_WINDOW(&focus_indicator.bottom));
 108
 109         color_white = RrColorNew(ob_rr_inst, 0xff, 0xff, 0xff);
 110
 111         a_focus_indicator = RrAppearanceNew(ob_rr_inst, 4);
 112         a_focus_indicator->surface.grad = RR_SURFACE_SOLID;
 113         a_focus_indicator->surface.relief = RR_RELIEF_FLAT;
 114         a_focus_indicator->surface.primary = RrColorNew(ob_rr_inst,
 115                                                         0, 0, 0);
 116         a_focus_indicator->texture[0].type = RR_TEXTURE_LINE_ART;
 117         a_focus_indicator->texture[0].data.lineart.color = color_white;
 118         a_focus_indicator->texture[1].type = RR_TEXTURE_LINE_ART;
 119         a_focus_indicator->texture[1].data.lineart.color = color_white;
 120         a_focus_indicator->texture[2].type = RR_TEXTURE_LINE_ART;
 121         a_focus_indicator->texture[2].data.lineart.color = color_white;
 122         a_focus_indicator->texture[3].type = RR_TEXTURE_LINE_ART;
 123         a_focus_indicator->texture[3].data.lineart.color = color_white;
 124     }
 125 }
 126
 127 void focus_cycle_shutdown(gboolean reconfig)
 128 {
 129     icon_popup_free(focus_cycle_popup);
 130
 131     if (!reconfig) {
 132         client_remove_destroy_notify(focus_cycle_destroy_notify);
 133
 134         RrColorFree(color_white);
 135
 136         RrAppearanceFree(a_focus_indicator);
 137
 138         XDestroyWindow(ob_display, focus_indicator.top.win);
 139         XDestroyWindow(ob_display, focus_indicator.left.win);
 140         XDestroyWindow(ob_display, focus_indicator.right.win);
 141         XDestroyWindow(ob_display, focus_indicator.bottom.win);
 142     }
 143 }
 144
 145 void focus_cycle_stop()
 146 {
 147     if (focus_cycle_target)
 148         focus_cycle(TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE);
 149 }
 150
 151
 152 static Window create_window(Window parent, gulong mask,
 153                             XSetWindowAttributes *attrib)
 154 {
 155     return XCreateWindow(ob_display, parent, 0, 0, 1, 1, 0,
 156                          RrDepth(ob_rr_inst), InputOutput,
 157                          RrVisual(ob_rr_inst), mask, attrib);
 158
 159 }
 160
 161 static gchar *popup_get_name(ObClient *c, ObClient **nametarget)
 162 {
 163     ObClient *p;
 164     gchar *title = NULL;
 165     const gchar *desk = NULL;
 166     gchar *ret;
 167
 168     /* find our highest direct parent, including non-normal windows */
 169     for (p = c; p->transient_for && p->transient_for != OB_TRAN_GROUP;
 170          p = p->transient_for);
 171
 172     if (c->desktop != DESKTOP_ALL && c->desktop != screen_desktop)
 173         desk = screen_desktop_names[c->desktop];
 174
 175     /* use the transient's parent's title/icon if we don't have one */
 176     if (p != c && !strcmp("", (c->iconic ? c->icon_title : c->title)))
 177         title = g_strdup(p->iconic ? p->icon_title : p->title);
 178
 179     if (title == NULL)
 180         title = g_strdup(c->iconic ? c->icon_title : c->title);
 181
 182     if (desk)
 183         ret = g_strdup_printf("%s [%s]", title, desk);
 184     else {
 185         ret = title;
 186         title = NULL;
 187     }
 188     g_free(title);
 189
 190     /* set this only if we're returning true and they asked for it */
 191     if (ret && nametarget) *nametarget = p;
 192     return ret;
 193 }
 194
 195 static void popup_cycle(ObClient *c, gboolean show,
 196                         gboolean all_desktops, gboolean dock_windows,
 197                         gboolean desktop_windows)
 198 {
 199     gchar *showtext = NULL;
 200     ObClient *showtarget;
 201
 202     if (!show) {
 203         icon_popup_hide(focus_cycle_popup);
 204         return;
 205     }
 206
 207     /* do this stuff only when the dialog is first showing */
 208     if (!focus_cycle_popup->popup->mapped &&
 209         !focus_cycle_popup->popup->delay_mapped)
 210     {
 211         Rect *a;
 212         gchar **names;
 213         GList *targets = NULL, *it;
 214         gint n = 0, i;
 215
 216         /* position the popup */
 217         a = screen_physical_area_monitor(0);
 218         icon_popup_position(focus_cycle_popup, CenterGravity,
 219                             a->x + a->width / 2, a->y + a->height / 2);
 220         icon_popup_height(focus_cycle_popup, POPUP_HEIGHT);
 221         icon_popup_min_width(focus_cycle_popup, POPUP_WIDTH);
 222         icon_popup_max_width(focus_cycle_popup,
 223                              MAX(a->width/3, POPUP_WIDTH));
 224
 225
 226         /* make its width to be the width of all the possible titles */
 227
 228         /* build a list of all the valid focus targets */
 229         for (it = focus_order; it; it = g_list_next(it)) {
 230             ObClient *ft = it->data;
 231             if (focus_target_valid(ft, all_desktops, dock_windows
 232                                    , desktop_windows))
 233             {
 234                 targets = g_list_prepend(targets, ft);
 235                 ++n;
 236             }
 237         }
 238         /* make it null terminated so we can use g_strfreev */
 239         names = g_new(char*, n+1);
 240         for (it = targets, i = 0; it; it = g_list_next(it), ++i) {
 241             ObClient *ft = it->data, *t;
 242             names[i] = popup_get_name(ft, &t);
 243
 244             /* little optimization.. save this text and client, so we dont
 245                have to get it again */
 246             if (ft == c) {
 247                 showtext = g_strdup(names[i]);
 248                 showtarget = t;
 249             }
 250         }
 251         names[n] = NULL;
 252
 253         icon_popup_text_width_to_strings(focus_cycle_popup, names, n);
 254         g_strfreev(names);
 255     }
 256
 257
 258     if (!showtext) showtext = popup_get_name(c, &showtarget);
 259     icon_popup_show(focus_cycle_popup, showtext,
 260                     client_icon(showtarget, 48, 48));
 261     g_free(showtext);
 262 }
 263
 264 static void focus_cycle_destroy_notify(ObClient *client, gpointer data)
 265 {
 266     /* end cycling if the target disappears. CurrentTime is fine, time won't
 267        be used
 268     */
 269     if (focus_cycle_target == client)
 270         focus_cycle(TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE);
 271 }
 272
 273 void focus_cycle_draw_indicator()
 274 {
 275     if (!focus_cycle_target) {
 276         XUnmapWindow(ob_display, focus_indicator.top.win);
 277         XUnmapWindow(ob_display, focus_indicator.left.win);
 278         XUnmapWindow(ob_display, focus_indicator.right.win);
 279         XUnmapWindow(ob_display, focus_indicator.bottom.win);
 280
 281         /* kill enter events cause by this unmapping */
 282         event_ignore_all_queued_enters();
 283     } else {
 284         /*
 285           if (focus_cycle_target)
 286               frame_adjust_focus(focus_cycle_target->frame, FALSE);
 287           frame_adjust_focus(focus_cycle_target->frame, TRUE);
 288         */
 289         gint x, y, w, h;
 290         gint wt, wl, wr, wb;
 291
 292         wt = wl = wr = wb = FOCUS_INDICATOR_WIDTH;
 293
 294         x = focus_cycle_target->frame->area.x;
 295         y = focus_cycle_target->frame->area.y;
 296         w = focus_cycle_target->frame->area.width;
 297         h = wt;
 298
 299         XMoveResizeWindow(ob_display, focus_indicator.top.win,
 300                           x, y, w, h);
 301         a_focus_indicator->texture[0].data.lineart.x1 = 0;
 302         a_focus_indicator->texture[0].data.lineart.y1 = h-1;
 303         a_focus_indicator->texture[0].data.lineart.x2 = 0;
 304         a_focus_indicator->texture[0].data.lineart.y2 = 0;
 305         a_focus_indicator->texture[1].data.lineart.x1 = 0;
 306         a_focus_indicator->texture[1].data.lineart.y1 = 0;
 307         a_focus_indicator->texture[1].data.lineart.x2 = w-1;
 308         a_focus_indicator->texture[1].data.lineart.y2 = 0;
 309         a_focus_indicator->texture[2].data.lineart.x1 = w-1;
 310         a_focus_indicator->texture[2].data.lineart.y1 = 0;
 311         a_focus_indicator->texture[2].data.lineart.x2 = w-1;
 312         a_focus_indicator->texture[2].data.lineart.y2 = h-1;
 313         a_focus_indicator->texture[3].data.lineart.x1 = (wl-1);
 314         a_focus_indicator->texture[3].data.lineart.y1 = h-1;
 315         a_focus_indicator->texture[3].data.lineart.x2 = w - wr;
 316         a_focus_indicator->texture[3].data.lineart.y2 = h-1;
 317         RrPaint(a_focus_indicator, focus_indicator.top.win,
 318                 w, h);
 319
 320         x = focus_cycle_target->frame->area.x;
 321         y = focus_cycle_target->frame->area.y;
 322         w = wl;
 323         h = focus_cycle_target->frame->area.height;
 324
 325         XMoveResizeWindow(ob_display, focus_indicator.left.win,
 326                           x, y, w, h);
 327         a_focus_indicator->texture[0].data.lineart.x1 = w-1;
 328         a_focus_indicator->texture[0].data.lineart.y1 = 0;
 329         a_focus_indicator->texture[0].data.lineart.x2 = 0;
 330         a_focus_indicator->texture[0].data.lineart.y2 = 0;
 331         a_focus_indicator->texture[1].data.lineart.x1 = 0;
 332         a_focus_indicator->texture[1].data.lineart.y1 = 0;
 333         a_focus_indicator->texture[1].data.lineart.x2 = 0;
 334         a_focus_indicator->texture[1].data.lineart.y2 = h-1;
 335         a_focus_indicator->texture[2].data.lineart.x1 = 0;
 336         a_focus_indicator->texture[2].data.lineart.y1 = h-1;
 337         a_focus_indicator->texture[2].data.lineart.x2 = w-1;
 338         a_focus_indicator->texture[2].data.lineart.y2 = h-1;
 339         a_focus_indicator->texture[3].data.lineart.x1 = w-1;
 340         a_focus_indicator->texture[3].data.lineart.y1 = wt-1;
 341         a_focus_indicator->texture[3].data.lineart.x2 = w-1;
 342         a_focus_indicator->texture[3].data.lineart.y2 = h - wb;
 343         RrPaint(a_focus_indicator, focus_indicator.left.win,
 344                 w, h);
 345
 346         x = focus_cycle_target->frame->area.x +
 347             focus_cycle_target->frame->area.width - wr;
 348         y = focus_cycle_target->frame->area.y;
 349         w = wr;
 350         h = focus_cycle_target->frame->area.height ;
 351
 352         XMoveResizeWindow(ob_display, focus_indicator.right.win,
 353                           x, y, w, h);
 354         a_focus_indicator->texture[0].data.lineart.x1 = 0;
 355         a_focus_indicator->texture[0].data.lineart.y1 = 0;
 356         a_focus_indicator->texture[0].data.lineart.x2 = w-1;
 357         a_focus_indicator->texture[0].data.lineart.y2 = 0;
 358         a_focus_indicator->texture[1].data.lineart.x1 = w-1;
 359         a_focus_indicator->texture[1].data.lineart.y1 = 0;
 360         a_focus_indicator->texture[1].data.lineart.x2 = w-1;
 361         a_focus_indicator->texture[1].data.lineart.y2 = h-1;
 362         a_focus_indicator->texture[2].data.lineart.x1 = w-1;
 363         a_focus_indicator->texture[2].data.lineart.y1 = h-1;
 364         a_focus_indicator->texture[2].data.lineart.x2 = 0;
 365         a_focus_indicator->texture[2].data.lineart.y2 = h-1;
 366         a_focus_indicator->texture[3].data.lineart.x1 = 0;
 367         a_focus_indicator->texture[3].data.lineart.y1 = wt-1;
 368         a_focus_indicator->texture[3].data.lineart.x2 = 0;
 369         a_focus_indicator->texture[3].data.lineart.y2 = h - wb;
 370         RrPaint(a_focus_indicator, focus_indicator.right.win,
 371                 w, h);
 372
 373         x = focus_cycle_target->frame->area.x;
 374         y = focus_cycle_target->frame->area.y +
 375             focus_cycle_target->frame->area.height - wb;
 376         w = focus_cycle_target->frame->area.width;
 377         h = wb;
 378
 379         XMoveResizeWindow(ob_display, focus_indicator.bottom.win,
 380                           x, y, w, h);
 381         a_focus_indicator->texture[0].data.lineart.x1 = 0;
 382         a_focus_indicator->texture[0].data.lineart.y1 = 0;
 383         a_focus_indicator->texture[0].data.lineart.x2 = 0;
 384         a_focus_indicator->texture[0].data.lineart.y2 = h-1;
 385         a_focus_indicator->texture[1].data.lineart.x1 = 0;
 386         a_focus_indicator->texture[1].data.lineart.y1 = h-1;
 387         a_focus_indicator->texture[1].data.lineart.x2 = w-1;
 388         a_focus_indicator->texture[1].data.lineart.y2 = h-1;
 389         a_focus_indicator->texture[2].data.lineart.x1 = w-1;
 390         a_focus_indicator->texture[2].data.lineart.y1 = h-1;
 391         a_focus_indicator->texture[2].data.lineart.x2 = w-1;
 392         a_focus_indicator->texture[2].data.lineart.y2 = 0;
 393         a_focus_indicator->texture[3].data.lineart.x1 = wl-1;
 394         a_focus_indicator->texture[3].data.lineart.y1 = 0;
 395         a_focus_indicator->texture[3].data.lineart.x2 = w - wr;
 396         a_focus_indicator->texture[3].data.lineart.y2 = 0;
 397         RrPaint(a_focus_indicator, focus_indicator.bottom.win,
 398                 w, h);
 399
 400         XMapWindow(ob_display, focus_indicator.top.win);
 401         XMapWindow(ob_display, focus_indicator.left.win);
 402         XMapWindow(ob_display, focus_indicator.right.win);
 403         XMapWindow(ob_display, focus_indicator.bottom.win);
 404     }
 405 }
 406
 407 /*! Returns if a focus target has valid group siblings that can be cycled
 408   to in its place */
 409 static gboolean focus_target_has_siblings(ObClient *ft, gboolean all_desktops)
 410
 411 {
 412     GSList *it;
 413
 414     if (!ft->group) return FALSE;
 415
 416     for (it = ft->group->members; it; it = g_slist_next(it)) {
 417         ObClient *c = it->data;
 418         /* check that it's not a helper window to avoid infinite recursion */
 419         if (c != ft && !client_helper(c) &&
 420             focus_target_valid(c, all_desktops, FALSE, FALSE))
 421         {
 422             return TRUE;
 423         }
 424     }
 425     return FALSE;
 426 }
 427
 428 /*! @param allow_helpers This is used for calling itself recursively while
 429                          checking helper windows. */
 430 static gboolean focus_target_valid(ObClient *ft,
 431                                    gboolean all_desktops,
 432                                    gboolean dock_windows,
 433                                    gboolean desktop_windows)
 434 {
 435     gboolean ok = FALSE;
 436
 437     /* it's on this desktop unless you want all desktops.
 438
 439        do this check first because it will usually filter out the most
 440        windows */
 441     ok = (all_desktops || ft->desktop == screen_desktop ||
 442           ft->desktop == DESKTOP_ALL);
 443
 444     /* the window can receive focus somehow */
 445     ok = ok && (ft->can_focus || ft->focus_notify);
 446
 447     /* it's the right type of window */
 448     if (dock_windows || desktop_windows)
 449         ok = ok && ((dock_windows && ft->type == OB_CLIENT_TYPE_DOCK) ||
 450                     (desktop_windows && ft->type == OB_CLIENT_TYPE_DESKTOP));
 451     else
 452         /* normal non-helper windows are valid targets */
 453         ok = ok &&
 454             ((client_normal(ft) && !client_helper(ft))
 455              ||
 456              /* helper windows are valid targets it... */
 457              (client_helper(ft) &&
 458               /* ...a window in its group already has focus ... */
 459               ((focus_client && ft->group == focus_client->group) ||
 460                /* ... or if there are no other windows in its group
 461                   that can be cycled to instead */
 462                !focus_target_has_siblings(ft, all_desktops))));
 463
 464     /* it's not set to skip the taskbar (unless it is a type that would be
 465        expected to set this hint */
 466     ok = ok && ((ft->type == OB_CLIENT_TYPE_DOCK ||
 467                  ft->type == OB_CLIENT_TYPE_DESKTOP ||
 468                  ft->type == OB_CLIENT_TYPE_TOOLBAR ||
 469                  ft->type == OB_CLIENT_TYPE_MENU ||
 470                  ft->type == OB_CLIENT_TYPE_UTILITY) ||
 471                 !ft->skip_taskbar);
 472
 473     /* it's not going to just send fous off somewhere else (modal window) */
 474     ok = ok && ft == client_focus_target(ft);
 475
 476     return ok;
 477 }
 478
 479 void focus_cycle(gboolean forward, gboolean all_desktops,
 480                  gboolean dock_windows, gboolean desktop_windows,
 481                  gboolean linear, gboolean interactive,
 482                  gboolean dialog, gboolean done, gboolean cancel)
 483 {
 484     static ObClient *first = NULL;
 485     static ObClient *t = NULL;
 486     static GList *order = NULL;
 487     GList *it, *start, *list;
 488     ObClient *ft = NULL;
 489
 490     if (interactive) {
 491         if (cancel) {
 492             focus_cycle_target = NULL;
 493             goto done_cycle;
 494         } else if (done)
 495             goto done_cycle;
 496
 497         if (!focus_order)
 498             goto done_cycle;
 499
 500         if (!first) first = focus_client;
 501
 502         if (linear) list = client_list;
 503         else        list = focus_order;
 504     } else {
 505         if (!focus_order)
 506             goto done_cycle;
 507         list = client_list;
 508     }
 509     if (!focus_cycle_target) focus_cycle_target = focus_client;
 510
 511     start = it = g_list_find(list, focus_cycle_target);
 512     if (!start) /* switched desktops or something? */
 513         start = it = forward ? g_list_last(list) : g_list_first(list);
 514     if (!start) goto done_cycle;
 515
 516     do {
 517         if (forward) {
 518             it = it->next;
 519             if (it == NULL) it = g_list_first(list);
 520         } else {
 521             it = it->prev;
 522             if (it == NULL) it = g_list_last(list);
 523         }
 524         ft = it->data;
 525         if (focus_target_valid(ft, all_desktops, dock_windows,
 526                                desktop_windows))
 527         {
 528             if (interactive) {
 529                 if (ft != focus_cycle_target) { /* prevents flicker */
 530                     focus_cycle_target = ft;
 531                     focus_cycle_draw_indicator();
 532                 }
 533                 /* same arguments as focus_target_valid */
 534                 popup_cycle(ft, dialog, all_desktops, dock_windows,
 535                             desktop_windows);
 536                 return;
 537             } else if (ft != focus_cycle_target) {
 538                 focus_cycle_target = ft;
 539                 done = TRUE;
 540                 break;
 541             }
 542         }
 543     } while (it != start);
 544
 545 done_cycle:
 546     if (done && focus_cycle_target)
 547         client_activate(focus_cycle_target, FALSE, TRUE);
 548
 549     t = NULL;
 550     first = NULL;
 551     focus_cycle_target = NULL;
 552     g_list_free(order);
 553     order = NULL;
 554
 555     if (interactive) {
 556         focus_cycle_draw_indicator();
 557         popup_cycle(ft, FALSE, FALSE, FALSE, FALSE);
 558     }
 559
 560     return;
 561 }
 562
 563 /* this be mostly ripped from fvwm */
 564 static ObClient *focus_find_directional(ObClient *c, ObDirection dir,
 565                                         gboolean dock_windows,
 566                                         gboolean desktop_windows)
 567 {
 568     gint my_cx, my_cy, his_cx, his_cy;
 569     gint offset = 0;
 570     gint distance = 0;
 571     gint score, best_score;
 572     ObClient *best_client, *cur;
 573     GList *it;
 574
 575     if(!client_list)
 576         return NULL;
 577
 578     /* first, find the centre coords of the currently focused window */
 579     my_cx = c->frame->area.x + c->frame->area.width / 2;
 580     my_cy = c->frame->area.y + c->frame->area.height / 2;
 581
 582     best_score = -1;
 583     best_client = NULL;
 584
 585     for(it = g_list_first(client_list); it; it = g_list_next(it)) {
 586         cur = it->data;
 587
 588         /* the currently selected window isn't interesting */
 589         if(cur == c)
 590             continue;
 591         if (cur->type == OB_CLIENT_TYPE_DOCK && !dock_windows)
 592             continue;
 593         if (cur->type == OB_CLIENT_TYPE_DESKTOP && !desktop_windows)
 594             continue;
 595         if (!client_normal(cur) &&
 596             cur->type != OB_CLIENT_TYPE_DOCK &&
 597             cur->type != OB_CLIENT_TYPE_DESKTOP)
 598             continue;
 599         /* using c->desktop instead of screen_desktop doesn't work if the
 600          * current window was omnipresent, hope this doesn't have any other
 601          * side effects */
 602         if(screen_desktop != cur->desktop && cur->desktop != DESKTOP_ALL)
 603             continue;
 604         if(cur->iconic)
 605             continue;
 606         if(!(client_focus_target(cur) == cur &&
 607              client_can_focus(cur)))
 608             continue;
 609
 610         /* find the centre coords of this window, from the
 611          * currently focused window's point of view */
 612         his_cx = (cur->frame->area.x - my_cx)
 613             + cur->frame->area.width / 2;
 614         his_cy = (cur->frame->area.y - my_cy)
 615             + cur->frame->area.height / 2;
 616
 617         if(dir == OB_DIRECTION_NORTHEAST || dir == OB_DIRECTION_SOUTHEAST ||
 618            dir == OB_DIRECTION_SOUTHWEST || dir == OB_DIRECTION_NORTHWEST) {
 619             gint tx;
 620             /* Rotate the diagonals 45 degrees counterclockwise.
 621              * To do this, multiply the matrix /+h +h\ with the
 622              * vector (x y).                   \-h +h/
 623              * h = sqrt(0.5). We can set h := 1 since absolute
 624              * distance doesn't matter here. */
 625             tx = his_cx + his_cy;
 626             his_cy = -his_cx + his_cy;
 627             his_cx = tx;
 628         }
 629
 630         switch(dir) {
 631         case OB_DIRECTION_NORTH:
 632         case OB_DIRECTION_SOUTH:
 633         case OB_DIRECTION_NORTHEAST:
 634         case OB_DIRECTION_SOUTHWEST:
 635             offset = (his_cx < 0) ? -his_cx : his_cx;
 636             distance = ((dir == OB_DIRECTION_NORTH ||
 637                          dir == OB_DIRECTION_NORTHEAST) ?
 638                         -his_cy : his_cy);
 639             break;
 640         case OB_DIRECTION_EAST:
 641         case OB_DIRECTION_WEST:
 642         case OB_DIRECTION_SOUTHEAST:
 643         case OB_DIRECTION_NORTHWEST:
 644             offset = (his_cy < 0) ? -his_cy : his_cy;
 645             distance = ((dir == OB_DIRECTION_WEST ||
 646                          dir == OB_DIRECTION_NORTHWEST) ?
 647                         -his_cx : his_cx);
 648             break;
 649         }
 650
 651         /* the target must be in the requested direction */
 652         if(distance <= 0)
 653             continue;
 654
 655         /* Calculate score for this window.  The smaller the better. */
 656         score = distance + offset;
 657
 658         /* windows more than 45 degrees off the direction are
 659          * heavily penalized and will only be chosen if nothing
 660          * else within a million pixels */
 661         if(offset > distance)
 662             score += 1000000;
 663
 664         if(best_score == -1 || score < best_score)
 665             best_client = cur,
 666                 best_score = score;
 667     }
 668
 669     return best_client;
 670 }
 671
 672 void focus_directional_cycle(ObDirection dir, gboolean dock_windows,
 673                              gboolean desktop_windows, gboolean interactive,
 674                              gboolean dialog, gboolean done, gboolean cancel)
 675 {
 676     static ObClient *first = NULL;
 677     ObClient *ft = NULL;
 678
 679     if (!interactive)
 680         return;
 681
 682     if (cancel) {
 683         focus_cycle_target = NULL;
 684         goto done_cycle;
 685     } else if (done)
 686         goto done_cycle;
 687
 688     if (!focus_order)
 689         goto done_cycle;
 690
 691     if (!first) first = focus_client;
 692     if (!focus_cycle_target) focus_cycle_target = focus_client;
 693
 694     if (focus_cycle_target)
 695         ft = focus_find_directional(focus_cycle_target, dir, dock_windows,
 696                                     desktop_windows);
 697     else {
 698         GList *it;
 699
 700         for (it = focus_order; it; it = g_list_next(it))
 701             if (focus_target_valid(it->data, FALSE, dock_windows,
 702                                    desktop_windows))
 703                 ft = it->data;
 704     }
 705
 706     if (ft) {
 707         if (ft != focus_cycle_target) {/* prevents flicker */
 708             focus_cycle_target = ft;
 709             focus_cycle_draw_indicator();
 710         }
 711     }
 712     if (focus_cycle_target) {
 713         /* same arguments as focus_target_valid */
 714         popup_cycle(focus_cycle_target, dialog, FALSE, dock_windows,
 715                     desktop_windows);
 716         if (dialog)
 717             return;
 718     }
 719
 720
 721 done_cycle:
 722     if (done && focus_cycle_target)
 723         client_activate(focus_cycle_target, FALSE, TRUE);
 724
 725     first = NULL;
 726     focus_cycle_target = NULL;
 727
 728     focus_cycle_draw_indicator();
 729     popup_cycle(ft, FALSE, FALSE, FALSE, FALSE);
 730
 731     return;
 732 }
 733
 734 void focus_order_add_new(ObClient *c)
 735 {
 736     if (c->iconic)
 737         focus_order_to_top(c);
 738     else {
 739         g_assert(!g_list_find(focus_order, c));
 740         /* if there are any iconic windows, put this above them in the order,
 741            but if there are not, then put it under the currently focused one */
 742         if (focus_order && ((ObClient*)focus_order->data)->iconic)
 743             focus_order = g_list_insert(focus_order, c, 0);
 744         else
 745             focus_order = g_list_insert(focus_order, c, 1);
 746     }
 747 }
 748