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     /* in the middle of cycling..? kill it. */
  87     focus_cycle_stop(focus_client);
  88     focus_cycle_stop(client);
  89
  90     focus_client = client;
  91
  92     if (client != NULL) {
  93         /* move to the top of the list */
  94         push_to_top(client);
  95         /* remove hiliting from the window when it gets focused */
  96         client_hilite(client, FALSE);
  97     }
  98
  99     /* set the NET_ACTIVE_WINDOW hint, but preserve it on shutdown */
 100     if (ob_state() != OB_STATE_EXITING) {
 101         active = client ? client->window : None;
 102         PROP_SET32(RootWindow(ob_display, ob_screen),
 103                    net_active_window, window, active);
 104     }
 105 }
 106
 107 static ObClient* focus_fallback_target(gboolean allow_refocus,
 108                                        gboolean allow_pointer,
 109                                        gboolean allow_omnipresent,
 110                                        ObClient *old)
 111 {
 112     GList *it;
 113     ObClient *c;
 114
 115     ob_debug_type(OB_DEBUG_FOCUS, "trying pointer stuff\n");
 116     if (allow_pointer && config_focus_follow)
 117         if ((c = client_under_pointer()) &&
 118             (allow_refocus || client_focus_target(c) != old) &&
 119             (client_normal(c) &&
 120              client_focus(c)))
 121         {
 122             ob_debug_type(OB_DEBUG_FOCUS, "found in pointer stuff\n");
 123             return c;
 124         }
 125
 126     ob_debug_type(OB_DEBUG_FOCUS, "trying the focus order\n");
 127     for (it = focus_order; it; it = g_list_next(it)) {
 128         c = it->data;
 129         /* fallback focus to a window if:
 130            1. it is on the current desktop. this ignores omnipresent
 131            windows, which are problematic in their own rite, unless they are
 132            specifically allowed
 133            2. it is a valid auto-focus target
 134            3. it is not shaded
 135         */
 136         if ((allow_omnipresent || c->desktop == screen_desktop) &&
 137             focus_valid_target(c, TRUE, FALSE, FALSE, FALSE, FALSE) &&
 138             !c->shaded &&
 139             (allow_refocus || client_focus_target(c) != old) &&
 140             client_focus(c))
 141         {
 142             ob_debug_type(OB_DEBUG_FOCUS, "found in focus order\n");
 143             return c;
 144         }
 145     }
 146
 147     ob_debug_type(OB_DEBUG_FOCUS, "trying a desktop window\n");
 148     for (it = focus_order; it; it = g_list_next(it)) {
 149         c = it->data;
 150         /* fallback focus to a window if:
 151            1. it is on the current desktop. this ignores omnipresent
 152            windows, which are problematic in their own rite.
 153            2. it is a normal type window, don't fall back onto a dock or
 154            a splashscreen or a desktop window (save the desktop as a
 155            backup fallback though)
 156         */
 157         if (focus_valid_target(c, TRUE, FALSE, FALSE, FALSE, TRUE) &&
 158             (allow_refocus || client_focus_target(c) != old) &&
 159             client_focus(c))
 160         {
 161             ob_debug_type(OB_DEBUG_FOCUS, "found a desktop window\n");
 162             return c;
 163         }
 164     }
 165
 166     return NULL;
 167 }
 168
 169 ObClient* focus_fallback(gboolean allow_refocus, gboolean allow_pointer,
 170                          gboolean allow_omnipresent, gboolean focus_lost)
 171 {
 172     ObClient *new;
 173     ObClient *old = focus_client;
 174
 175     /* unfocus any focused clients.. they can be focused by Pointer events
 176        and such, and then when we try focus them, we won't get a FocusIn
 177        event at all for them. */
 178     if (focus_lost)
 179         focus_nothing();
 180
 181     new = focus_fallback_target(allow_refocus, allow_pointer,
 182                                 allow_omnipresent, old);
 183     /* get what was really focused */
 184     if (new) new = client_focus_target(new);
 185
 186     return new;
 187 }
 188
 189 void focus_nothing(void)
 190 {
 191     /* Install our own colormap */
 192     if (focus_client != NULL) {
 193         screen_install_colormap(focus_client, FALSE);
 194         screen_install_colormap(NULL, TRUE);
 195     }
 196
 197     /* nothing is focused, update the colormap and _the root property_ */
 198     focus_set_client(NULL);
 199
 200     event_cancel_all_key_grabs();
 201
 202     /* when nothing will be focused, send focus to the backup target */
 203     XSetInputFocus(ob_display, screen_support_win, RevertToPointerRoot,
 204                    event_curtime);
 205 }
 206
 207 void focus_order_add_new(ObClient *c)
 208 {
 209     if (c->iconic)
 210         focus_order_to_top(c);
 211     else {
 212         g_assert(!g_list_find(focus_order, c));
 213         /* if there are any iconic windows, put this above them in the order,
 214            but if there are not, then put it under the currently focused one */
 215         if (focus_order && ((ObClient*)focus_order->data)->iconic)
 216             focus_order = g_list_insert(focus_order, c, 0);
 217         else
 218             focus_order = g_list_insert(focus_order, c, 1);
 219     }
 220
 221     /* in the middle of cycling..? kill it. */
 222     focus_cycle_stop(c);
 223 }
 224
 225 void focus_order_remove(ObClient *c)
 226 {
 227     focus_order = g_list_remove(focus_order, c);
 228
 229     /* in the middle of cycling..? kill it. */
 230     focus_cycle_stop(c);
 231 }
 232
 233 void focus_order_to_top(ObClient *c)
 234 {
 235     focus_order = g_list_remove(focus_order, c);
 236     if (!c->iconic) {
 237         focus_order = g_list_prepend(focus_order, c);
 238     } else {
 239         GList *it;
 240
 241         /* insert before first iconic window */
 242         for (it = focus_order;
 243              it && !((ObClient*)it->data)->iconic; it = g_list_next(it));
 244         focus_order = g_list_insert_before(focus_order, it, c);
 245     }
 246 }
 247
 248 void focus_order_to_bottom(ObClient *c)
 249 {
 250     focus_order = g_list_remove(focus_order, c);
 251     if (c->iconic) {
 252         focus_order = g_list_append(focus_order, c);
 253     } else {
 254         GList *it;
 255
 256         /* insert before first iconic window */
 257         for (it = focus_order;
 258              it && !((ObClient*)it->data)->iconic; it = g_list_next(it));
 259         focus_order = g_list_insert_before(focus_order, it, c);
 260     }
 261 }
 262
 263 ObClient *focus_order_find_first(guint desktop)
 264 {
 265     GList *it;
 266     for (it = focus_order; it; it = g_list_next(it)) {
 267         ObClient *c = it->data;
 268         if (c->desktop == desktop || c->desktop == DESKTOP_ALL)
 269             return c;
 270     }
 271     return NULL;
 272 }
 273
 274 /*! Returns if a focus target has valid group siblings that can be cycled
 275   to in its place */
 276 static gboolean focus_target_has_siblings(ObClient *ft,
 277                                           gboolean iconic_windows,
 278                                           gboolean all_desktops)
 279
 280 {
 281     GSList *it;
 282
 283     if (!ft->group) return FALSE;
 284
 285     for (it = ft->group->members; it; it = g_slist_next(it)) {
 286         ObClient *c = it->data;
 287         /* check that it's not a helper window to avoid infinite recursion */
 288         if (c != ft && c->type == OB_CLIENT_TYPE_NORMAL &&
 289             focus_valid_target(c, TRUE, iconic_windows, all_desktops,
 290                                FALSE, FALSE))
 291         {
 292             return TRUE;
 293         }
 294     }
 295     return FALSE;
 296 }
 297
 298 gboolean focus_valid_target(ObClient *ft,
 299                             gboolean helper_windows,
 300                             gboolean iconic_windows,
 301                             gboolean all_desktops,
 302                             gboolean dock_windows,
 303                             gboolean desktop_windows)
 304 {
 305     gboolean ok = FALSE;
 306
 307     /* it's on this desktop unless you want all desktops.
 308
 309        do this check first because it will usually filter out the most
 310        windows */
 311     ok = (all_desktops || ft->desktop == screen_desktop ||
 312           ft->desktop == DESKTOP_ALL);
 313
 314     /* the window can receive focus somehow */
 315     ok = ok && (ft->can_focus || ft->focus_notify);
 316
 317     /* the window is not iconic, or we're allowed to go to iconic ones */
 318     ok = ok && (iconic_windows || !ft->iconic);
 319
 320     /* it's the right type of window */
 321     if (dock_windows || desktop_windows)
 322         ok = ok && ((dock_windows && ft->type == OB_CLIENT_TYPE_DOCK) ||
 323                     (desktop_windows && ft->type == OB_CLIENT_TYPE_DESKTOP));
 324     /* modal windows are important and can always get focus if they are
 325        visible and stuff, so don't change 'ok' based on their type */
 326     else if (!ft->modal)
 327         /* normal non-helper windows are valid targets */
 328         ok = ok &&
 329             ((client_normal(ft) && !client_helper(ft))
 330              ||
 331              /* helper windows are valid targets if... */
 332              (client_helper(ft) &&
 333               /* ...a window in its group already has focus and we want to
 334                  include helper windows ... */
 335               ((focus_client && ft->group == focus_client->group &&
 336                 helper_windows) ||
 337                /* ... or if there are no other windows in its group
 338                   that can be focused instead */
 339                !focus_target_has_siblings(ft, iconic_windows, all_desktops))));
 340
 341     /* it's not set to skip the taskbar (but this only applies to normal typed
 342        windows, and is overridden if the window is modal) */
 343     ok = ok && (ft->type != OB_CLIENT_TYPE_NORMAL ||
 344                 ft->modal ||
 345                 !ft->skip_taskbar);
 346
 347     /* it's not going to just send focus off somewhere else (modal window),
 348        unless that modal window is not one of our valid targets, then let
 349        you choose this window and bring the modal one here */
 350     {
 351         ObClient *cft = client_focus_target(ft);
 352         ok = ok && (ft == cft || !focus_valid_target(cft,
 353                                                      TRUE,
 354                                                      iconic_windows,
 355                                                      all_desktops,
 356                                                      dock_windows,
 357                                                      desktop_windows));
 358     }
 359
 360     return ok;
 361 }