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 gboolean noreorder = 0;
  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     old = focus_client;
  89     focus_client = client;
  90
  91     /* move to the top of the list */
  92     if (noreorder)
  93         --noreorder;
  94     else if (client != NULL)
  95         push_to_top(client);
  96
  97     /* set the NET_ACTIVE_WINDOW hint */
  98     active = client ? client->window : None;
  99     PROP_SET32(ob_root, net_active_window, window, active);
 100
 101     if (focus_client != NULL)
 102         dispatch_client(Event_Client_Focus, focus_client, 0, 0);
 103     if (old != NULL)
 104         dispatch_client(Event_Client_Unfocus, old, 0, 0);
 105 }
 106
 107 static gboolean focus_under_pointer()
 108 {
 109     int x, y;
 110     GList *it;
 111
 112     if (ob_pointer_pos(&x, &y)) {
 113         for (it = stacking_list; it != NULL; it = it->next) {
 114             Client *c = it->data;
 115             if (c->desktop == screen_desktop &&
 116                 RECT_CONTAINS(c->frame->area, x, y))
 117                 break;
 118         }
 119         if (it != NULL)
 120             return client_normal(it->data) && client_focus(it->data);
 121     }
 122     return FALSE;
 123 }
 124
 125 /* finds the first transient that isn't 'skip' and ensure's that client_normal
 126  is true for it */
 127 static Client *find_transient_recursive(Client *c, Client *top, Client *skip)
 128 {
 129     GSList *it;
 130     Client *ret;
 131
 132     for (it = c->transients; it; it = it->next) {
 133         g_message("looking");
 134         if (it->data == top) return NULL;
 135         ret = find_transient_recursive(it->data, top, skip);
 136         if (ret && ret != skip && client_normal(ret)) return ret;
 137         if (it->data != skip && client_normal(it->data)) return it->data;
 138         g_message("not found");
 139     }
 140     return NULL;
 141 }
 142
 143 static gboolean focus_fallback_transient(Client *top, Client *old)
 144 {
 145     Client *target = find_transient_recursive(top, top, old);
 146     if (!target) {
 147         /* make sure client_normal is true always */
 148         if (!client_normal(top))
 149             return FALSE;
 150         target = top; /* no transient, keep the top */
 151     }
 152     return client_focus(target);
 153 }
 154
 155 void focus_fallback(FallbackType type)
 156 {
 157     GList *it;
 158     Client *old = NULL;
 159
 160     old = focus_client;
 161
 162     /* unfocus any focused clients.. they can be focused by Pointer events
 163        and such, and then when I try focus them, I won't get a FocusIn event
 164        at all for them.
 165     */
 166     focus_set_client(NULL);
 167
 168     if (!(type == Fallback_Desktop ?
 169           config_focus_last_on_desktop : config_focus_last)) {
 170         if (config_focus_follow) focus_under_pointer();
 171         return;
 172     }
 173
 174     if (type == Fallback_Unfocusing && old) {
 175         /* try for transient relations */
 176         if (old->transient_for) {
 177             if (old->transient_for == TRAN_GROUP) {
 178                 for (it = focus_order[screen_desktop]; it; it = it->next) {
 179                     GSList *sit;
 180
 181                     for (sit = old->group->members; sit; sit = sit->next)
 182                         if (sit->data == it->data)
 183                             if (focus_fallback_transient(sit->data, old))
 184                                 return;
 185                 }
 186             } else {
 187                 if (focus_fallback_transient(old->transient_for, old))
 188                     return;
 189             }
 190         }
 191
 192         /* try for group relations */
 193         if (old->group) {
 194             GSList *sit;
 195
 196             for (it = focus_order[screen_desktop]; it != NULL; it = it->next)
 197                 for (sit = old->group->members; sit; sit = sit->next)
 198                     if (sit->data == it->data)
 199                         if (sit->data != old && client_normal(sit->data))
 200                             if (client_focus(sit->data))
 201                                 return;
 202         }
 203     }
 204
 205     for (it = focus_order[screen_desktop]; it != NULL; it = it->next)
 206         if (type != Fallback_Unfocusing || it->data != old)
 207             if (client_normal(it->data) && client_focus(it->data))
 208                 return;
 209
 210     /* nothing to focus */
 211     focus_set_client(NULL);
 212 }
 213
 214 Client *focus_cycle(gboolean forward, gboolean linear, gboolean done,
 215                  gboolean cancel)
 216 {
 217     static Client *first = NULL;
 218     static Client *t = NULL;
 219     static GList *order = NULL;
 220     GList *it, *start, *list;
 221     Client *ft;
 222
 223     if (cancel) {
 224         if (first) client_focus(first);
 225         goto done_cycle;
 226     } else if (done) {
 227         if (focus_client) {
 228             push_to_top(focus_client); /* move to top of focus_order */
 229             stacking_raise(focus_client);
 230         }
 231         goto done_cycle;
 232     }
 233     if (!first) first = focus_client;
 234
 235     if (linear) list = client_list;
 236     else        list = focus_order[screen_desktop];
 237
 238     start = it = g_list_find(list, focus_client);
 239     if (!start) /* switched desktops or something? */
 240         start = it = forward ? g_list_last(list) : g_list_first(list);
 241     if (!start) goto done_cycle;
 242
 243     do {
 244         if (forward) {
 245             it = it->next;
 246             if (it == NULL) it = list;
 247         } else {
 248             it = it->prev;
 249             if (it == NULL) it = g_list_last(list);
 250         }
 251         ft = client_focus_target(it->data);
 252         if (ft == it->data && focus_client != ft && client_normal(ft) &&
 253             client_focus(ft)) {
 254             noreorder++; /* avoid reordering the focus_order */
 255             return ft;
 256         }
 257     } while (it != start);
 258     return NULL;
 259
 260 done_cycle:
 261     t = NULL;
 262     first = NULL;
 263     g_list_free(order);
 264     order = NULL;
 265     return NULL;
 266 }