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"
9 #define DEFAULT_RESISTANCE 10
11 void plugin_setup_config()
15 config_def_set(config_def_new("resistance", Config_Integer,
17 "The amount of resistance to provide when "
18 "moving windows past edges."
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 "
26 config_set("resistance.windows", Config_Bool, val);
29 static void resist(Client *c, int *x, int *y)
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;
40 if (!config_get("resistance", Config_Integer, &resist) ||
42 resist.integer = DEFAULT_RESISTANCE;
43 config_set("resistance", Config_Integer, resist);
45 if (!config_get("resistance.windows", Config_Bool, &window_resist))
46 g_assert_not_reached();
48 w = c->frame->area.width;
49 h = c->frame->area.height;
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;
61 /* snap to other clients */
62 if (window_resist.bool)
63 for (it = stacking_list; it != NULL; it = it->next) {
65 int tl, tt, tr, tb; /* 1 past the target's edges on each side */
68 /* don't snap to self or non-visibles */
69 if (!target->frame->visible || target == c) continue;
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;
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
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;
89 if (snapx && snapy) break;
92 /* get the screen boundaries */
93 area = screen_area(c->desktop);
96 ar = al + area->width - 1;
97 ab = at + area->height - 1;
99 /* snap to screen edges */
100 if (cl >= al && l < al && l >= al - resist.integer)
102 else if (cr <= ar && r > ar && r <= ar + resist.integer)
104 if (ct >= at && t < at && t >= at - resist.integer)
106 else if (cb <= ab && b > ab && b < ab + resist.integer)
110 static void event(ObEvent *e, void *foo)
112 g_assert(e->type == Event_Client_Moving);
114 resist(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
117 void plugin_startup()
119 dispatch_register(Event_Client_Moving, (EventHandler)event, NULL);
122 void plugin_shutdown()
124 dispatch_register(0, (EventHandler)event, NULL);