obt/xevent.c

   1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
   2
   3    obt/xevent.c for the Openbox window manager
   4    Copyright (c) 2007        Dana Jansens
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    See the COPYING file for a copy of the GNU General Public License.
  17 */
  18
  19 #include "obt/xevent.h"
  20 #include "obt/mainloop.h"
  21 #include "obt/util.h"
  22
  23 typedef struct _ObtXEventBinding ObtXEventBinding;
  24
  25 struct _ObtXEventHandler
  26 {
  27     gint ref;
  28     ObtMainLoop *loop;
  29
  30     /* An array of hash tables where the key is the window, and the value is
  31        the ObtXEventBinding */
  32     GHashTable **bindings;
  33     gint num_event_types; /* the length of the bindings array */
  34 };
  35
  36 struct _ObtXEventBinding
  37 {
  38     Window win;
  39     ObtXEventCallback func;
  40     gpointer data;
  41 };
  42
  43 static void xevent_handler(const XEvent *e, gpointer data);
  44 static guint window_hash(Window *w) { return *w; }
  45 static gboolean window_comp(Window *w1, Window *w2) { return *w1 == *w2; }
  46
  47 ObtXEventHandler* xevent_new()
  48 {
  49     ObtXEventHandler *h;
  50
  51     h = g_new0(ObtXEventHandler, 1);
  52     h->ref = 1;
  53
  54     return h;
  55 }
  56
  57 void xevent_ref(ObtXEventHandler *h)
  58 {
  59     ++h->ref;
  60 }
  61
  62 void xevent_unref(ObtXEventHandler *h)
  63 {
  64     if (h && --h->ref == 0) {
  65         gint i;
  66
  67         if (h->loop)
  68             obt_main_loop_x_remove(h->loop, xevent_handler);
  69         for (i = 0; i < h->num_event_types; ++i)
  70             g_hash_table_destroy(h->bindings[i]);
  71         g_free(h->bindings);
  72
  73         obt_free0(h, ObtXEventHandler, 1);
  74     }
  75 }
  76
  77 void xevent_register(ObtXEventHandler *h, ObtMainLoop *loop)
  78 {
  79     h->loop = loop;
  80     obt_main_loop_x_add(loop, xevent_handler, h, NULL);
  81 }
  82
  83 void xevent_set_handler(ObtXEventHandler *h, gint type, Window win,
  84                         ObtXEventCallback func, gpointer data)
  85 {
  86     ObtXEventBinding *b;
  87
  88     g_assert(func);
  89
  90     /* make sure we have a spot for the event */
  91     if (type + 1 < h->num_event_types) {
  92         gint i;
  93         h->bindings = g_renew(GHashTable*, h->bindings, type + 1);
  94         for (i = h->num_event_types; i < type + 1; ++i)
  95             h->bindings[i] = g_hash_table_new_full((GHashFunc)window_hash,
  96                                                    (GEqualFunc)window_comp,
  97                                                    NULL, g_free);
  98         h->num_event_types = type + 1;
  99     }
 100
 101     b = g_new(ObtXEventBinding, 1);
 102     b->win = win;
 103     b->func = func;
 104     b->data = data;
 105     g_hash_table_replace(h->bindings[type], &b->win, b);
 106 }
 107
 108 void xevent_remove_handler(ObtXEventHandler *h, gint type, Window win)
 109 {
 110     g_assert(type < h->num_event_types);
 111     g_assert(win);
 112
 113     g_hash_table_remove(h->bindings[type], &win);
 114 }
 115
 116 static void xevent_handler(const XEvent *e, gpointer data)
 117 {
 118     ObtXEventHandler *h;
 119     ObtXEventBinding *b;
 120
 121     h = data;
 122
 123     if (e->type < h->num_event_types) {
 124         const gint all = OBT_XEVENT_ALL_WINDOWS;
 125         /* run the all_windows handler first */
 126         b = g_hash_table_lookup(h->bindings[e->xany.type], &all);
 127         if (b) b->func(e, b->data);
 128         /* then run the per-window handler */
 129         b = g_hash_table_lookup(h->bindings[e->xany.type], &e->xany.window);
 130         if (b) b->func(e, b->data);
 131     }
 132     else
 133         g_message("Unhandled X Event type %d", e->xany.type);
 134 }