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 <glib.h>
   7
   8 static int resistance = 10;
   9 static gboolean window_resistance = TRUE; /* window-to-window */
  10
  11 static void resist(Client *c, int *x, int *y)
  12 {
  13     GList *it;
  14     Rect *area;
  15     int l, t, r, b; /* requested edges */
  16     int al, at, ar, ab; /* screen area edges */
  17     int cl, ct, cr, cb; /* current edges */
  18     int w, h; /* current size */
  19     gboolean snapx = FALSE, snapy = FALSE;
  20
  21     w = c->frame->area.width;
  22     h = c->frame->area.height;
  23
  24     l = *x;
  25     t = *y;
  26     r = l + w - 1;
  27     b = t + h - 1;
  28
  29     cl = c->frame->area.x;
  30     ct = c->frame->area.y;
  31     cr = cl + c->frame->area.width - 1;
  32     cb = ct + c->frame->area.height - 1;
  33
  34     /* snap to other clients */
  35     if (window_resistance)
  36         for (it = stacking_list; it != NULL; it = it->next) {
  37             Client *target;
  38             int tl, tt, tr, tb; /* 1 past the target's edges on each side */
  39
  40             target = it->data;
  41             /* don't snap to self or non-visibles */
  42             if (!target->frame->visible || target == c) continue;
  43
  44             tl = target->frame->area.x - 1;
  45             tt = target->frame->area.y - 1;
  46             tr = tl + target->frame->area.width + 1;
  47             tb = tt + target->frame->area.height + 1;
  48
  49             /* snapx and snapy ensure that the window snaps to the top-most
  50                window edge available, without going all the way from
  51                bottom-to-top in the stacking list
  52             */
  53             if (!snapx && cl >= tr && l < tr && l >= tr - resistance)
  54                 *x = tr, snapx = TRUE;
  55             else if (!snapx && cr <= tl && r > tl && r <= tl + resistance)
  56                 *x = tl - w + 1, snapx = TRUE;
  57             else if (!snapy && ct >= tb && t < tb && t >= tb - resistance)
  58                 *y = tb, snapy = TRUE;
  59             else if (!snapy && cb <= tt && b > tt && b <= tt + resistance)
  60                 *y = tt - h + 1, snapy = TRUE;
  61
  62             if (snapx && snapy) break;
  63         }
  64
  65     /* get the screen boundaries */
  66     area = screen_area(c->desktop);
  67     al = area->x;
  68     at = area->y;
  69     ar = al + area->width - 1;
  70     ab = at + area->height - 1;
  71
  72     /* snap to screen edges */
  73     if (cl >= al && l < al && l >= al - resistance)
  74         *x = al;
  75     else if (cr <= ar && r > ar && r <= ar + resistance)
  76             *x = ar - w + 1;
  77     if (ct >= at && t < at && t >= at - resistance)
  78         *y = at;
  79     else if (cb <= ab && b > ab && b < ab + resistance)
  80         *y = ab - h + 1;
  81 }
  82
  83 static void event(ObEvent *e, void *foo)
  84 {
  85     g_assert(e->type == Event_Client_Moving);
  86
  87     resist(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
  88 }
  89
  90 void plugin_startup()
  91 {
  92     dispatch_register(Event_Client_Moving, (EventHandler)event, NULL);
  93 }
  94
  95 void plugin_shutdown()
  96 {
  97     dispatch_register(0, (EventHandler)event, NULL);
  98 }