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     Client *snapx = NULL, *snapy = NULL;
  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 == NULL) {
  81                 if (cl >= tr && l < tr && l >= tr - resist.integer)
  82                     *x = tr, snapx = target;
  83                 else if (cr <= tl && r > tl && r <= tl + resist.integer)
  84                     *x = tl - w + 1, snapx = target;
  85                 if (snapx != NULL) {
  86                     /* try to corner snap to the window */
  87                     if (ct > tt && t <= tt && t > tt - resist.integer)
  88                         *y = tt + 1, snapy = target;
  89                     else if (cb < tb && b >= tb && b < tb + resist.integer)
  90                         *y = tb - h, snapy = target;
  91                 }
  92             }
  93             if (snapy == NULL) {
  94                 if (ct >= tb && t < tb && t >= tb - resist.integer)
  95                     *y = tb, snapy = target;
  96                 else if (!cb <= tt && b > tt && b <= tt + resist.integer)
  97                     *y = tt - h + 1, snapy = target;
  98                 if (snapy != NULL) {
  99                     /* try to corner snap to the window */
 100                     if (cl > tl && l <= tl && l > tl - resist.integer)
 101                         *x = tl + 1, snapx = target;
 102                     else if (cr < tr && r >= tr && r < tr + resist.integer)
 103                         *x = tr - w, snapx = target;
 104                 }
 105             }
 106
 107             if (snapx && snapy) break;
 108         }
 109
 110     /* get the screen boundaries */
 111     area = screen_area(c->desktop);
 112     al = area->x;
 113     at = area->y;
 114     ar = al + area->width - 1;
 115     ab = at + area->height - 1;
 116
 117     /* snap to screen edges */
 118     if (cl >= al && l < al && l >= al - resist.integer)
 119         *x = al;
 120     else if (cr <= ar && r > ar && r <= ar + resist.integer)
 121             *x = ar - w + 1;
 122     if (ct >= at && t < at && t >= at - resist.integer)
 123         *y = at;
 124     else if (cb <= ab && b > ab && b < ab + resist.integer)
 125         *y = ab - h + 1;
 126 }
 127
 128 static void event(ObEvent *e, void *foo)
 129 {
 130     g_assert(e->type == Event_Client_Moving);
 131
 132     resist(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
 133 }
 134
 135 void plugin_startup()
 136 {
 137     dispatch_register(Event_Client_Moving, (EventHandler)event, NULL);
 138 }
 139
 140 void plugin_shutdown()
 141 {
 142     dispatch_register(0, (EventHandler)event, NULL);
 143 }