openbox/focus.c

   1 #include "event.h"
   2 #include "openbox.h"
   3 #include "client.h"
   4 #include "config.h"
   5 #include "frame.h"
   6 #include "screen.h"
   7 #include "group.h"
   8 #include "prop.h"
   9 #include "dispatch.h"
  10 #include "focus.h"
  11 #include "parse.h"
  12 #include "stacking.h"
  13
  14 #include <X11/Xlib.h>
  15 #include <glib.h>
  16
  17 Client *focus_client = NULL;
  18 GList **focus_order = NULL; /* these lists are created when screen_startup
  19                                sets the number of desktops */
  20
  21 Window focus_backup = None;
  22
  23 static Client *focus_cycle_target = NULL;
  24
  25 void focus_startup()
  26 {
  27     /* create the window which gets focus when no clients get it. Have to
  28        make it override-redirect so we don't try manage it, since it is
  29        mapped. */
  30     XSetWindowAttributes attrib;
  31
  32     focus_client = NULL;
  33
  34     attrib.override_redirect = TRUE;
  35     focus_backup = XCreateWindow(ob_display, ob_root,
  36                                  -100, -100, 1, 1, 0,
  37                                  CopyFromParent, InputOutput, CopyFromParent,
  38                                  CWOverrideRedirect, &attrib);
  39     XMapWindow(ob_display, focus_backup);
  40     stacking_raise_internal(focus_backup);
  41
  42     /* start with nothing focused */
  43     focus_set_client(NULL);
  44 }
  45
  46 void focus_shutdown()
  47 {
  48     guint i;
  49
  50     for (i = 0; i < screen_num_desktops; ++i)
  51         g_list_free(focus_order[i]);
  52     g_free(focus_order);
  53     focus_order = NULL;
  54
  55     XDestroyWindow(ob_display, focus_backup);
  56
  57     /* reset focus to root */
  58     XSetInputFocus(ob_display, PointerRoot, RevertToPointerRoot,
  59                    event_lasttime);
  60 }
  61
  62 static void push_to_top(Client *client)
  63 {
  64     guint desktop;
  65
  66     desktop = client->desktop;
  67     if (desktop == DESKTOP_ALL) desktop = screen_desktop;
  68     focus_order[desktop] = g_list_remove(focus_order[desktop], client);
  69     focus_order[desktop] = g_list_prepend(focus_order[desktop], client);
  70 }
  71
  72 void focus_set_client(Client *client)
  73 {
  74     Window active;
  75     Client *old;
  76
  77     /* uninstall the old colormap, and install the new one */
  78     screen_install_colormap(focus_client, FALSE);
  79     screen_install_colormap(client, TRUE);
  80
  81     if (client == NULL) {
  82         /* when nothing will be focused, send focus to the backup target */
  83         XSetInputFocus(ob_display, focus_backup, RevertToPointerRoot,
  84                        event_lasttime);
  85         XSync(ob_display, FALSE);
  86     }
  87
  88     /* in the middle of cycling..? kill it. */
  89     if (focus_cycle_target)
  90         focus_cycle(TRUE, TRUE, TRUE, TRUE);
  91
  92     old = focus_client;
  93     focus_client = client;
  94
  95     /* move to the top of the list */
  96     if (client != NULL)
  97         push_to_top(client);
  98
  99     /* set the NET_ACTIVE_WINDOW hint */
 100     active = client ? client->window : None;
 101     PROP_SET32(ob_root, net_active_window, window, active);
 102
 103     if (focus_client != NULL)
 104         dispatch_client(Event_Client_Focus, focus_client, 0, 0);
 105     if (old != NULL)
 106         dispatch_client(Event_Client_Unfocus, old, 0, 0);
 107 }
 108
 109 static gboolean focus_under_pointer()
 110 {
 111     int x, y;
 112     GList *it;
 113
 114     if (ob_pointer_pos(&x, &y)) {
 115         for (it = stacking_list; it != NULL; it = it->next) {
 116             Client *c = it->data;
 117             if (c->desktop == screen_desktop &&
 118                 RECT_CONTAINS(c->frame->area, x, y))
 119                 break;
 120         }
 121         if (it != NULL)
 122             return client_normal(it->data) && client_focus(it->data);
 123     }
 124     return FALSE;
 125 }
 126
 127 /* finds the first transient that isn't 'skip' and ensure's that client_normal
 128  is true for it */
 129 static Client *find_transient_recursive(Client *c, Client *top, Client *skip)
 130 {
 131     GSList *it;
 132     Client *ret;
 133
 134     for (it = c->transients; it; it = it->next) {
 135         g_message("looking");
 136         if (it->data == top) return NULL;
 137         ret = find_transient_recursive(it->data, top, skip);
 138         if (ret && ret != skip && client_normal(ret)) return ret;
 139         if (it->data != skip && client_normal(it->data)) return it->data;
 140         g_message("not found");
 141     }
 142     return NULL;
 143 }
 144
 145 static gboolean focus_fallback_transient(Client *top, Client *old)
 146 {
 147     Client *target = find_transient_recursive(top, top, old);
 148     if (!target) {
 149         /* make sure client_normal is true always */
 150         if (!client_normal(top))
 151             return FALSE;
 152         target = top; /* no transient, keep the top */
 153     }
 154     return client_focus(target);
 155 }
 156
 157 void focus_fallback(FallbackType type)
 158 {
 159     GList *it;
 160     Client *old = NULL;
 161
 162     old = focus_client;
 163
 164     /* unfocus any focused clients.. they can be focused by Pointer events
 165        and such, and then when I try focus them, I won't get a FocusIn event
 166        at all for them.
 167     */
 168     focus_set_client(NULL);
 169
 170     if (!(type == Fallback_Desktop ?
 171           config_focus_last_on_desktop : config_focus_last)) {
 172         if (config_focus_follow) focus_under_pointer();
 173         return;
 174     }
 175
 176     if (type == Fallback_Unfocusing && old) {
 177         /* try for transient relations */
 178         if (old->transient_for) {
 179             if (old->transient_for == TRAN_GROUP) {
 180                 for (it = focus_order[screen_desktop]; it; it = it->next) {
 181                     GSList *sit;
 182
 183                     for (sit = old->group->members; sit; sit = sit->next)
 184                         if (sit->data == it->data)
 185                             if (focus_fallback_transient(sit->data, old))
 186                                 return;
 187                 }
 188             } else {
 189                 if (focus_fallback_transient(old->transient_for, old))
 190                     return;
 191             }
 192         }
 193
 194         /* try for group relations */
 195         if (old->group) {
 196             GSList *sit;
 197
 198             for (it = focus_order[screen_desktop]; it != NULL; it = it->next)
 199                 for (sit = old->group->members; sit; sit = sit->next)
 200                     if (sit->data == it->data)
 201                         if (sit->data != old && client_normal(sit->data))
 202                             if (client_focus(sit->data))
 203                                 return;
 204         }
 205     }
 206
 207     for (it = focus_order[screen_desktop]; it != NULL; it = it->next)
 208         if (type != Fallback_Unfocusing || it->data != old)
 209             if (client_normal(it->data) && client_focus(it->data))
 210                 return;
 211
 212     /* nothing to focus */
 213     focus_set_client(NULL);
 214 }
 215
 216 Client *focus_cycle(gboolean forward, gboolean linear, gboolean done,
 217                     gboolean cancel)
 218 {
 219     static Client *first = NULL;
 220     static Client *t = NULL;
 221     static GList *order = NULL;
 222     GList *it, *start, *list;
 223     Client *ft;
 224
 225     if (cancel) {
 226         /*if (first) client_focus(first); XXX*/
 227         if (focus_cycle_target)
 228             frame_adjust_focus(focus_cycle_target->frame, FALSE);
 229         if (focus_client)
 230             frame_adjust_focus(focus_client->frame, TRUE);
 231         goto done_cycle;
 232     } else if (done) {
 233         if (focus_cycle_target) {
 234             client_focus(focus_cycle_target);
 235             stacking_raise(focus_cycle_target);
 236         }
 237         goto done_cycle;
 238     }
 239     if (!first) first = focus_client;
 240     if (!focus_cycle_target) focus_cycle_target = focus_client;
 241
 242     if (linear) list = client_list;
 243     else        list = focus_order[screen_desktop];
 244
 245     start = it = g_list_find(list, focus_cycle_target);
 246     if (!start) /* switched desktops or something? */
 247         start = it = forward ? g_list_last(list) : g_list_first(list);
 248     if (!start) goto done_cycle;
 249
 250     do {
 251         if (forward) {
 252             it = it->next;
 253             if (it == NULL) it = list;
 254         } else {
 255             it = it->prev;
 256             if (it == NULL) it = g_list_last(list);
 257         }
 258         ft = client_focus_target(it->data);
 259         if (ft == it->data && client_normal(ft) && client_focusable(ft)) {
 260             if (focus_cycle_target)
 261                 frame_adjust_focus(focus_cycle_target->frame, FALSE);
 262             else if (focus_client)
 263                 frame_adjust_focus(focus_client->frame, FALSE);
 264             focus_cycle_target = ft;
 265             frame_adjust_focus(focus_cycle_target->frame, TRUE);
 266             return ft;
 267         }
 268     } while (it != start);
 269     return NULL;
 270
 271 done_cycle:
 272     t = NULL;
 273     first = NULL;
 274     focus_cycle_target = NULL;
 275     g_list_free(order);
 276     order = NULL;
 277     return NULL;
 278 }