Dogcows Code - chaz/openbox/blob - plugins/resistance.c

   1 #include "../kernel/dispatch.h"
   2 #include "../kernel/client.h"
   3 #include "../kernel/frame.h"
   4 #include "../kernel/stacking.h"
   5 #include "../kernel/screen.h"
   6 #include "../kernel/config.h"
   7 #include <glib.h>
   8
   9 #define DEFAULT_RESISTANCE 10
  10
  11 void plugin_setup_config()
  12 {
  13     ConfigValue val;
  14
  15     config_def_set(config_def_new("resistance", Config_Integer,
  16                                   "Edge Resistance",
  17                                   "The amount of resistance to provide when "
  18                                   "moving windows past edges."
  19                                   "positioned."));
  20     config_def_set(config_def_new("resistance.windows", Config_Bool,
  21                                   "Edge Resistance On Windows",
  22                                   "Whether to provide edge resistance when "
  23                                   "moving windows past the edge of another "
  24                                   "window."));
  25     val.bool = TRUE;
  26     config_set("resistance.windows", Config_Bool, val);
  27 }
  28
  29 static void resist(Client *c, int *x, int *y)
  30 {
  31     GList *it;
  32     Rect *area;
  33     int l, t, r, b; /* requested edges */
  34     int al, at, ar, ab; /* screen area edges */
  35     int cl, ct, cr, cb; /* current edges */
  36     int w, h; /* current size */
  37     gboolean snapx = FALSE, snapy = FALSE;
  38     ConfigValue resist, window_resist;
  39
  40     if (!config_get("resistance", Config_Integer, &resist) ||
  41         resist.integer < 0) {
  42         resist.integer = DEFAULT_RESISTANCE;
  43         config_set("resistance", Config_Integer, resist);
  44     }
  45     if (!config_get("resistance.windows", Config_Bool, &window_resist))
  46         g_assert_not_reached();
  47
  48     w = c->frame->area.width;
  49     h = c->frame->area.height;
  50
  51     l = *x;
  52     t = *y;
  53     r = l + w - 1;
  54     b = t + h - 1;
  55
  56     cl = c->frame->area.x;
  57     ct = c->frame->area.y;
  58     cr = cl + c->frame->area.width - 1;
  59     cb = ct + c->frame->area.height - 1;
  60
  61     /* snap to other clients */
  62     if (window_resist.bool)
  63         for (it = stacking_list; it != NULL; it = it->next) {
  64             Client *target;
  65             int tl, tt, tr, tb; /* 1 past the target's edges on each side */
  66
  67             target = it->data;
  68             /* don't snap to self or non-visibles */
  69             if (!target->frame->visible || target == c) continue;
  70
  71             tl = target->frame->area.x - 1;
  72             tt = target->frame->area.y - 1;
  73             tr = tl + target->frame->area.width + 1;
  74             tb = tt + target->frame->area.height + 1;
  75
  76             /* snapx and snapy ensure that the window snaps to the top-most
  77                window edge available, without going all the way from
  78                bottom-to-top in the stacking list
  79             */
  80             if (!snapx && cl >= tr && l < tr && l >= tr - resist.integer)
  81                 *x = tr, snapx = TRUE;
  82             else if (!snapx && cr <= tl && r > tl && r <= tl + resist.integer)
  83                 *x = tl - w + 1, snapx = TRUE;
  84             else if (!snapy && ct >= tb && t < tb && t >= tb - resist.integer)
  85                 *y = tb, snapy = TRUE;
  86             else if (!snapy && cb <= tt && b > tt && b <= tt + resist.integer)
  87                 *y = tt - h + 1, snapy = TRUE;
  88
  89             if (snapx && snapy) break;
  90         }
  91
  92     /* get the screen boundaries */
  93     area = screen_area(c->desktop);
  94     al = area->x;
  95     at = area->y;
  96     ar = al + area->width - 1;
  97     ab = at + area->height - 1;
  98
  99     /* snap to screen edges */
 100     if (cl >= al && l < al && l >= al - resist.integer)
 101         *x = al;
 102     else if (cr <= ar && r > ar && r <= ar + resist.integer)
 103             *x = ar - w + 1;
 104     if (ct >= at && t < at && t >= at - resist.integer)
 105         *y = at;
 106     else if (cb <= ab && b > ab && b < ab + resist.integer)
 107         *y = ab - h + 1;
 108 }
 109
 110 static void event(ObEvent *e, void *foo)
 111 {
 112     g_assert(e->type == Event_Client_Moving);
 113
 114     resist(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
 115 }
 116
 117 void plugin_startup()
 118 {
 119     dispatch_register(Event_Client_Moving, (EventHandler)event, NULL);
 120 }
 121
 122 void plugin_shutdown()
 123 {
 124     dispatch_register(0, (EventHandler)event, NULL);
 125 }