openbox/focus.c

   1 #include "event.h"
   2 #include "openbox.h"
   3 #include "client.h"
   4 #include "frame.h"
   5 #include "screen.h"
   6 #include "prop.h"
   7 #include "dispatch.h"
   8 #include "focus.h"
   9
  10 #include <X11/Xlib.h>
  11 #include <glib.h>
  12
  13 Client *focus_client = NULL;
  14 GList **focus_order = NULL; /* these lists are created when screen_startup
  15                                sets the number of desktops */
  16
  17 Window focus_backup = None;
  18 gboolean focus_new = TRUE;
  19 gboolean focus_follow = TRUE;
  20
  21 void focus_startup()
  22 {
  23     /* create the window which gets focus when no clients get it. Have to
  24        make it override-redirect so we don't try manage it, since it is
  25        mapped. */
  26     XSetWindowAttributes attrib;
  27
  28     focus_client = NULL;
  29     focus_new = TRUE;
  30     focus_follow = TRUE;
  31
  32     attrib.override_redirect = TRUE;
  33     focus_backup = XCreateWindow(ob_display, ob_root,
  34                                  -100, -100, 1, 1, 0,
  35                                  CopyFromParent, InputOutput, CopyFromParent,
  36                                  CWOverrideRedirect, &attrib);
  37     XMapRaised(ob_display, focus_backup);
  38
  39     /* start with nothing focused */
  40     focus_set_client(NULL);
  41 }
  42
  43 void focus_shutdown()
  44 {
  45     guint i;
  46
  47     for (i = 0; i < screen_num_desktops; ++i)
  48         g_list_free(focus_order[i]);
  49     g_free(focus_order);
  50     focus_order = NULL;
  51
  52     XDestroyWindow(ob_display, focus_backup);
  53
  54     /* reset focus to root */
  55     XSetInputFocus(ob_display, PointerRoot, RevertToPointerRoot,
  56                    event_lasttime);
  57 }
  58
  59 void focus_set_client(Client *client)
  60 {
  61     Window active;
  62     Client *old;
  63     guint desktop;
  64
  65     /* uninstall the old colormap, and install the new one */
  66     screen_install_colormap(focus_client, FALSE);
  67     screen_install_colormap(client, TRUE);
  68
  69     if (client == NULL) {
  70         /* when nothing will be focused, send focus to the backup target */
  71         XSetInputFocus(ob_display, focus_backup, RevertToPointerRoot,
  72                        event_lasttime);
  73         XSync(ob_display, FALSE);
  74     }
  75
  76     old = focus_client;
  77     focus_client = client;
  78
  79     /* move to the top of the list */
  80     if (client != NULL) {
  81         desktop = client->desktop;
  82         if (desktop == DESKTOP_ALL) desktop = screen_desktop;
  83         focus_order[desktop] = g_list_remove(focus_order[desktop], client);
  84         focus_order[desktop] = g_list_prepend(focus_order[desktop], client);
  85     }
  86
  87     /* set the NET_ACTIVE_WINDOW hint */
  88     active = client ? client->window : None;
  89     PROP_SET32(ob_root, net_active_window, window, active);
  90
  91     if (focus_client != NULL)
  92         dispatch_client(Event_Client_Focus, focus_client, 0, 0);
  93     if (old != NULL)
  94         dispatch_client(Event_Client_Unfocus, old, 0, 0);
  95 }
  96
  97 static gboolean focus_under_pointer()
  98 {
  99     Window w;
 100     int i, x, y;
 101     guint u;
 102     GList *it;
 103
 104     if (XQueryPointer(ob_display, ob_root, &w, &w, &x, &y, &i, &i, &u)) {
 105         for (it = stacking_list; it != NULL; it = it->next) {
 106             Client *c = it->data;
 107             if (c->desktop == screen_desktop &&
 108                 RECT_CONTAINS(c->frame->area, x, y))
 109                 break;
 110         }
 111         if (it != NULL)
 112             return client_normal(it->data) && client_focus(it->data);
 113     }
 114     return FALSE;
 115 }
 116
 117 void focus_fallback(gboolean switching_desks)
 118 {
 119     GList *it;
 120     gboolean under = FALSE;
 121     Client *old = NULL;
 122
 123     old = focus_client;
 124
 125     /* unfocus any focused clients.. they can be focused by Pointer events
 126        and such, and then when I try focus them, I won't get a FocusIn event
 127        at all for them.
 128     */
 129     focus_set_client(NULL);
 130
 131     if (switching_desks) {
 132         /* don't skip any windows when switching desktops */
 133         old = NULL;
 134     } else {
 135         if (focus_follow)
 136             under = focus_under_pointer();
 137     }
 138
 139     if (!under) {
 140         for (it = focus_order[screen_desktop]; it != NULL; it = it->next)
 141             if (it->data != old && client_normal(it->data))
 142                 if (client_focus(it->data))
 143                     break;
 144         if (it == NULL) /* nothing to focus */
 145             focus_set_client(NULL);
 146     }
 147 }