Dogcows Code - chaz/openbox/blob - openbox/focus.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 "debug.h"
  21 #include "event.h"
  22 #include "openbox.h"
  23 #include "grab.h"
  24 #include "client.h"
  25 #include "config.h"
  26 #include "group.h"
  27 #include "focus_cycle.h"
  28 #include "screen.h"
  29 #include "prop.h"
  30 #include "keyboard.h"
  31 #include "focus.h"
  32 #include "stacking.h"
  33
  34 #include <X11/Xlib.h>
  35 #include <glib.h>
  36
  37 #define FOCUS_INDICATOR_WIDTH 6
  38
  39 ObClient *focus_client = NULL;
  40 GList *focus_order = NULL;
  41
  42 void focus_startup(gboolean reconfig)
  43 {
  44     if (reconfig) return;
  45
  46     /* start with nothing focused */
  47     focus_nothing();
  48 }
  49
  50 void focus_shutdown(gboolean reconfig)
  51 {
  52     if (reconfig) return;
  53
  54     /* reset focus to root */
  55     XSetInputFocus(ob_display, PointerRoot, RevertToNone, CurrentTime);
  56 }
  57
  58 static void push_to_top(ObClient *client)
  59 {
  60     ObClient *p;
  61
  62     /* if it is modal for a single window, then put that window at the top
  63        of the focus order first, so it will be right after ours. the same is
  64        done with stacking */
  65     if (client->modal && (p = client_direct_parent(client)))
  66         push_to_top(p);
  67
  68     focus_order = g_list_remove(focus_order, client);
  69     focus_order = g_list_prepend(focus_order, client);
  70 }
  71
  72 void focus_set_client(ObClient *client)
  73 {
  74     Window active;
  75
  76     ob_debug_type(OB_DEBUG_FOCUS,
  77                   "focus_set_client 0x%lx\n", client ? client->window : 0);
  78
  79     if (focus_client == client)
  80         return;
  81
  82     /* uninstall the old colormap, and install the new one */
  83     screen_install_colormap(focus_client, FALSE);
  84     screen_install_colormap(client, TRUE);
  85
  86     focus_client = client;
  87
  88     if (client != NULL) {
  89         /* move to the top of the list */
  90         push_to_top(client);
  91         /* remove hiliting from the window when it gets focused */
  92         client_hilite(client, FALSE);
  93     }
  94
  95     /* set the NET_ACTIVE_WINDOW hint, but preserve it on shutdown */
  96     if (ob_state() != OB_STATE_EXITING) {
  97         active = client ? client->window : None;
  98         PROP_SET32(RootWindow(ob_display, ob_screen),
  99                    net_active_window, window, active);
 100     }
 101 }
 102
 103 static ObClient* focus_fallback_target(gboolean allow_refocus,
 104                                        gboolean allow_pointer,
 105                                        gboolean allow_omnipresent,
 106                                        ObClient *old)
 107 {
 108     GList *it;
 109     ObClient *c;
 110
 111     ob_debug_type(OB_DEBUG_FOCUS, "trying pointer stuff\n");
 112     if (allow_pointer && config_focus_follow)
 113         if ((c = client_under_pointer()) &&
 114             (allow_refocus || client_focus_target(c) != old) &&
 115             (client_normal(c) &&
 116              client_focus(c)))
 117         {
 118             ob_debug_type(OB_DEBUG_FOCUS, "found in pointer stuff\n");
 119             return c;
 120         }
 121
 122     ob_debug_type(OB_DEBUG_FOCUS, "trying the focus order\n");
 123     for (it = focus_order; it; it = g_list_next(it)) {
 124         c = it->data;
 125         /* fallback focus to a window if:
 126            1. it is on the current desktop. this ignores omnipresent
 127            windows, which are problematic in their own rite, unless they are
 128            specifically allowed
 129            2. it is a valid auto-focus target
 130            3. it is not shaded
 131         */
 132         if ((allow_omnipresent || c->desktop == screen_desktop) &&
 133             focus_valid_target(c, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE) &&
 134             !c->shaded &&
 135             (allow_refocus || client_focus_target(c) != old) &&
 136             client_focus(c))
 137         {
 138             ob_debug_type(OB_DEBUG_FOCUS, "found in focus order\n");
 139             return c;
 140         }
 141     }
 142
 143     ob_debug_type(OB_DEBUG_FOCUS, "trying a desktop window\n");
 144     for (it = focus_order; it; it = g_list_next(it)) {
 145         c = it->data;
 146         /* fallback focus to a window if:
 147            1. it is on the current desktop. this ignores omnipresent
 148            windows, which are problematic in their own rite.
 149            2. it is a normal type window, don't fall back onto a dock or
 150            a splashscreen or a desktop window (save the desktop as a
 151            backup fallback though)
 152         */
 153         if (focus_valid_target(c, TRUE, FALSE, FALSE, FALSE, TRUE, FALSE) &&
 154             (allow_refocus || client_focus_target(c) != old) &&
 155             client_focus(c))
 156         {
 157             ob_debug_type(OB_DEBUG_FOCUS, "found a desktop window\n");
 158             return c;
 159         }
 160     }
 161
 162     return NULL;
 163 }
 164
 165 ObClient* focus_fallback(gboolean allow_refocus, gboolean allow_pointer,
 166                          gboolean allow_omnipresent, gboolean focus_lost)
 167 {
 168     ObClient *new;
 169     ObClient *old = focus_client;
 170
 171     /* unfocus any focused clients.. they can be focused by Pointer events
 172        and such, and then when we try focus them, we won't get a FocusIn
 173        event at all for them. */
 174     if (focus_lost)
 175         focus_nothing();
 176
 177     new = focus_fallback_target(allow_refocus, allow_pointer,
 178                                 allow_omnipresent, old);
 179     /* get what was really focused */
 180     if (new) new = client_focus_target(new);
 181
 182     return new;
 183 }
 184
 185 void focus_nothing(void)
 186 {
 187     /* nothing is focused, update the colormap and _the root property_ */
 188     focus_set_client(NULL);
 189
 190     /* when nothing will be focused, send focus to the backup target */
 191     XSetInputFocus(ob_display, screen_support_win, RevertToPointerRoot,
 192                    event_curtime);
 193 }
 194
 195 void focus_order_add_new(ObClient *c)
 196 {
 197     if (c->iconic)
 198         focus_order_to_top(c);
 199     else {
 200         g_assert(!g_list_find(focus_order, c));
 201         /* if there are any iconic windows, put this above them in the order,
 202            but if there are not, then put it under the currently focused one */
 203         if (focus_order && ((ObClient*)focus_order->data)->iconic)
 204             focus_order = g_list_insert(focus_order, c, 0);
 205         else
 206             focus_order = g_list_insert(focus_order, c, 1);
 207     }
 208
 209     /* in the middle of cycling..? kill it. */
 210     focus_cycle_stop(c);
 211 }
 212
 213 void focus_order_remove(ObClient *c)
 214 {
 215     focus_order = g_list_remove(focus_order, c);
 216
 217     /* in the middle of cycling..? kill it. */
 218     focus_cycle_stop(c);
 219 }
 220
 221 void focus_order_to_top(ObClient *c)
 222 {
 223     focus_order = g_list_remove(focus_order, c);
 224     if (!c->iconic) {
 225         focus_order = g_list_prepend(focus_order, c);
 226     } else {
 227         GList *it;
 228
 229         /* insert before first iconic window */
 230         for (it = focus_order;
 231              it && !((ObClient*)it->data)->iconic; it = g_list_next(it));
 232         focus_order = g_list_insert_before(focus_order, it, c);
 233     }
 234 }
 235
 236 void focus_order_to_bottom(ObClient *c)
 237 {
 238     focus_order = g_list_remove(focus_order, c);
 239     if (c->iconic) {
 240         focus_order = g_list_append(focus_order, c);
 241     } else {
 242         GList *it;
 243
 244         /* insert before first iconic window */
 245         for (it = focus_order;
 246              it && !((ObClient*)it->data)->iconic; it = g_list_next(it));
 247         focus_order = g_list_insert_before(focus_order, it, c);
 248     }
 249 }
 250
 251 ObClient *focus_order_find_first(guint desktop)
 252 {
 253     GList *it;
 254     for (it = focus_order; it; it = g_list_next(it)) {
 255         ObClient *c = it->data;
 256         if (c->desktop == desktop || c->desktop == DESKTOP_ALL)
 257             return c;
 258     }
 259     return NULL;
 260 }
 261
 262 /*! Returns if a focus target has valid group siblings that can be cycled
 263   to in its place */
 264 static gboolean focus_target_has_siblings(ObClient *ft,
 265                                           gboolean iconic_windows,
 266                                           gboolean all_desktops)
 267
 268 {
 269     GSList *it;
 270
 271     if (!ft->group) return FALSE;
 272
 273     for (it = ft->group->members; it; it = g_slist_next(it)) {
 274         ObClient *c = it->data;
 275         /* check that it's not a helper window to avoid infinite recursion */
 276         if (c != ft && c->type == OB_CLIENT_TYPE_NORMAL &&
 277             focus_valid_target(c, TRUE, iconic_windows, all_desktops,
 278                                FALSE, FALSE, FALSE))
 279         {
 280             return TRUE;
 281         }
 282     }
 283     return FALSE;
 284 }
 285
 286 gboolean focus_valid_target(ObClient *ft,
 287                             gboolean helper_windows,
 288                             gboolean iconic_windows,
 289                             gboolean all_desktops,
 290                             gboolean dock_windows,
 291                             gboolean desktop_windows,
 292                             gboolean user_request)
 293 {
 294     gboolean ok = FALSE;
 295
 296     /* it's on this desktop unless you want all desktops.
 297
 298        do this check first because it will usually filter out the most
 299        windows */
 300     ok = (all_desktops || ft->desktop == screen_desktop ||
 301           ft->desktop == DESKTOP_ALL);
 302
 303     /* the window can receive focus somehow */
 304     ok = ok && (ft->can_focus || ft->focus_notify);
 305
 306     /* the window is not iconic, or we're allowed to go to iconic ones */
 307     ok = ok && (iconic_windows || !ft->iconic);
 308
 309     /* it's the right type of window */
 310     if (dock_windows || desktop_windows)
 311         ok = ok && ((dock_windows && ft->type == OB_CLIENT_TYPE_DOCK) ||
 312                     (desktop_windows && ft->type == OB_CLIENT_TYPE_DESKTOP));
 313     /* modal windows are important and can always get focus if they are
 314        visible and stuff, so don't change 'ok' based on their type */
 315     else if (!ft->modal)
 316         /* normal non-helper windows are valid targets */
 317         ok = ok &&
 318             ((client_normal(ft) && !client_helper(ft))
 319              ||
 320              /* helper windows are valid targets if... */
 321              (client_helper(ft) &&
 322               /* ...a window in its group already has focus and we want to
 323                  include helper windows ... */
 324               ((focus_client && ft->group == focus_client->group &&
 325                 helper_windows) ||
 326                /* ... or if there are no other windows in its group
 327                   that can be focused instead */
 328                !focus_target_has_siblings(ft, iconic_windows, all_desktops))));
 329
 330     /* it's not set to skip the taskbar (but this only applies to normal typed
 331        windows, and is overridden if the window is modal or if the user asked
 332        for this window to be focused) */
 333     ok = ok && (ft->type != OB_CLIENT_TYPE_NORMAL ||
 334                 ft->modal ||
 335                 user_request ||
 336                 !ft->skip_taskbar);
 337
 338     /* it's not going to just send focus off somewhere else (modal window),
 339        unless that modal window is not one of our valid targets, then let
 340        you choose this window and bring the modal one here */
 341     {
 342         ObClient *cft = client_focus_target(ft);
 343         ok = ok && (ft == cft || !focus_valid_target(cft,
 344                                                      TRUE,
 345                                                      iconic_windows,
 346                                                      all_desktops,
 347                                                      dock_windows,
 348                                                      desktop_windows,
 349                                                      FALSE));
 350     }
 351
 352     return ok;
 353 }