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' */
 126 static Client *find_transient_recursive(Client *c, Client *top, Client *skip)
 127 {
 128     GSList *it;
 129     Client *ret;
 130
 131     for (it = c->transients; it; it = it->next) {
 132         g_message("looking");
 133         if (it->data == top) return NULL;
 134         ret = find_transient_recursive(it->data, top, skip);
 135         if (ret && ret != skip) return ret;
 136         if (it->data != skip) return it->data;
 137         g_message("not found");
 138     }
 139     return NULL;
 140 }
 141
 142 void focus_fallback(FallbackType type)
 143 {
 144     GList *it;
 145     Client *old = NULL;
 146
 147     old = focus_client;
 148
 149     /* unfocus any focused clients.. they can be focused by Pointer events
 150        and such, and then when I try focus them, I won't get a FocusIn event
 151        at all for them.
 152     */
 153     focus_set_client(NULL);
 154
 155     if (!(type == Fallback_Desktop ?
 156           config_focus_last_on_desktop : config_focus_last)) {
 157         if (config_focus_follow) focus_under_pointer();
 158         return;
 159     }
 160
 161     if (type == Fallback_Unfocusing && old && old->transient_for) {
 162         Client *c = NULL;
 163
 164         if (old->transient_for == TRAN_GROUP) {
 165             for (it = focus_order[screen_desktop]; it != NULL; it = it->next) {
 166                 GSList *sit;
 167
 168                 for (sit = old->group->members; sit; sit = sit->next)
 169                     if (sit->data == it->data && client_normal(sit->data) &&
 170                         client_focusable(sit->data)) {
 171                         c = sit->data;
 172                         break;
 173                     }
 174             }
 175         } else {
 176             if (client_normal(old->transient_for))
 177                 c = old->transient_for;
 178         }
 179
 180         if (c) {
 181             Client *t = find_transient_recursive(c, c, old);
 182             if (!t) t = c; /* no transient, keep the top */
 183             if (client_focus(t))
 184                 return;
 185         }
 186     }
 187
 188     for (it = focus_order[screen_desktop]; it != NULL; it = it->next)
 189         if (type != Fallback_Unfocusing || it->data != old)
 190             if (client_normal(it->data) && client_focus(it->data))
 191                 return;
 192
 193     /* nothing to focus */
 194     focus_set_client(NULL);
 195 }
 196
 197 Client *focus_cycle(gboolean forward, gboolean linear, gboolean done,
 198                  gboolean cancel)
 199 {
 200     static Client *first = NULL;
 201     static Client *t = NULL;
 202     static GList *order = NULL;
 203     GList *it, *start, *list;
 204     Client *ft;
 205
 206     if (cancel) {
 207         if (first) client_focus(first);
 208         goto done_cycle;
 209     } else if (done) {
 210         if (focus_client) {
 211             push_to_top(focus_client); /* move to top of focus_order */
 212             stacking_raise(focus_client);
 213         }
 214         goto done_cycle;
 215     }
 216     if (!first) first = focus_client;
 217
 218     if (linear) list = client_list;
 219     else        list = focus_order[screen_desktop];
 220
 221     start = it = g_list_find(list, focus_client);
 222     if (!start) /* switched desktops or something? */
 223         start = it = forward ? g_list_last(list) : g_list_first(list);
 224     if (!start) goto done_cycle;
 225
 226     do {
 227         if (forward) {
 228             it = it->next;
 229             if (it == NULL) it = list;
 230         } else {
 231             it = it->prev;
 232             if (it == NULL) it = g_list_last(list);
 233         }
 234         ft = client_focus_target(it->data);
 235         if (ft == it->data && focus_client != ft && client_normal(ft) &&
 236             client_focus(ft)) {
 237             noreorder++; /* avoid reordering the focus_order */
 238             return ft;
 239         }
 240     } while (it != start);
 241     return NULL;
 242
 243 done_cycle:
 244     t = NULL;
 245     first = NULL;
 246     g_list_free(order);
 247     order = NULL;
 248     return NULL;
 249 }