6 static int resistance = 10;
7 static gboolean edge_resistance = TRUE; /* window-to-edge */
8 static gboolean window_resistance = TRUE; /* window-to-window */
10 void snap_move(Client *c, int *x, int *y, int w, int h)
14 int l, t, r, b; /* requested edges */
15 int al, at, ar, ab; /* screen area edges */
16 int cl, ct, cr, cb; /* current edges */
17 gboolean snapx = FALSE, snapy = FALSE;
19 if (!edge_resistance) return;
21 /* add the frame to the dimensions */
27 cl = c->frame->area.x;
28 ct = c->frame->area.y;
29 cr = cl + c->frame->area.width - 1;
30 cb = ct + c->frame->area.height - 1;
32 /* snap to other clients */
33 if (window_resistance)
34 for (it = stacking_list; it != NULL; it = it->next) {
36 int tl, tt, tr, tb; /* 1 past the target's edges on each side */
40 tl = target->frame->area.x - 1;
41 tt = target->frame->area.y - 1;
42 tr = tl + target->frame->area.width + 1;
43 tb = tt + target->frame->area.height + 1;
45 /* snapx and snapy ensure that the window snaps to the top-most
46 window edge available, without going all the way from
47 bottom-to-top in the stacking list
49 if (!snapx && cl >= tr && l < tr && l >= tr - resistance)
50 *x = tr, snapx = TRUE;
51 else if (!snapx && cr <= tl && r > tl && r <= tl + resistance)
52 *x = tl - w + 1, snapx = TRUE;
53 else if (!snapy && ct >= tb && t < tb && t >= tb - resistance)
54 *y = tb, snapy = TRUE;
55 else if (!snapy && cb <= tt && b > tt && b <= tt + resistance)
56 *y = tt - h + 1, snapy = TRUE;
58 if (snapx && snapy) break;
61 /* get the screen boundaries */
62 area = screen_area(c->desktop);
65 ar = al + area->width - 1;
66 ab = at + area->height - 1;
68 /* snap to screen edges */
69 if (cl >= al && l < al && l >= al - resistance)
71 else if (cr <= ar && r > ar && r <= ar + resistance)
73 if (ct >= at && t < at && t >= at - resistance)
75 else if (cb <= ab && b > ab && b < ab + resistance)