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_move(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 Client *snapx = NULL, *snapy = NULL;
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
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;
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;
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;
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;
107 if (snapx && snapy) break;
110 /* get the screen boundaries */
111 area = screen_area(c->desktop);
114 ar = al + area->width - 1;
115 ab = at + area->height - 1;
117 /* snap to screen edges */
118 if (cl >= al && l < al && l >= al - resist.integer)
120 else if (cr <= ar && r > ar && r <= ar + resist.integer)
122 if (ct >= at && t < at && t >= at - resist.integer)
124 else if (cb <= ab && b > ab && b < ab + resist.integer)
128 static void resist_size(Client *c, int *w, int *h, Corner corn)
131 Client *t; /* target */
132 int lt, rb; /* my left/top and right/bottom sides */
133 int dlt, drb; /* my destination left/top and right/bottom sides */
134 int tlt, trb; /* target's left/top and right/bottom sides */
136 int al, at, ar, ab; /* screen boundaries */
137 Client *snapx = NULL, *snapy = NULL;
138 ConfigValue resist, window_resist;
140 if (!config_get("resistance", Config_Integer, &resist) ||
141 resist.integer < 0) {
142 resist.integer = DEFAULT_RESISTANCE;
143 config_set("resistance", Config_Integer, resist);
145 if (!config_get("resistance.windows", Config_Bool, &window_resist))
146 g_assert_not_reached();
148 /* get the screen boundaries */
149 area = screen_area(c->desktop);
152 ar = al + area->width - 1;
153 ab = at + area->height - 1;
155 /* horizontal snapping */
157 lt = c->frame->area.x;
158 rb = lt + c->frame->area.width - 1;
160 /* snap to other windows */
161 if (window_resist.bool) {
162 for (it = stacking_list; !snapx && it != NULL; it = it->next) {
165 /* don't snap to invisibles or ourself */
166 if (!t->frame->visible || t == c) continue;
170 case Corner_BottomLeft:
172 drb = rb + *w - c->frame->area.width;
173 tlt = t->frame->area.x;
174 if (rb < tlt && drb >= tlt && drb < tlt + resist.integer)
175 *w = tlt - lt, snapx = t;
177 case Corner_TopRight:
178 case Corner_BottomRight:
179 dlt = lt - *w + c->frame->area.width;
181 trb = t->frame->area.x + t->frame->area.width - 1;
182 if (lt > trb && dlt <= trb && dlt > trb - resist.integer)
183 *w = rb - trb, snapx = t;
189 /* snap to screen edges */
192 case Corner_BottomLeft:
194 drb = rb + *w - c->frame->area.width;
195 if (rb <= ar && drb > ar && drb <= ar + resist.integer)
198 case Corner_TopRight:
199 case Corner_BottomRight:
200 dlt = lt - *w + c->frame->area.width;
202 if (lt >= al && dlt < al && dlt >= al - resist.integer)
207 /* vertical snapping */
209 lt = c->frame->area.y;
210 rb = lt + c->frame->area.height - 1;
212 /* snap to other windows */
213 if (window_resist.bool) {
214 for (it = stacking_list; !snapy && it != NULL; it = it->next) {
217 /* don't snap to invisibles or ourself */
218 if (!t->frame->visible || t == c) continue;
222 case Corner_TopRight:
224 drb = rb + *h - c->frame->area.height;
225 tlt = t->frame->area.y;
226 if (rb < tlt && drb >= tlt && drb < tlt + resist.integer)
227 *h = tlt - lt, snapy = t;
229 case Corner_BottomLeft:
230 case Corner_BottomRight:
231 dlt = lt - *h + c->frame->area.height;
233 trb = t->frame->area.y + t->frame->area.height - 1;
234 if (lt > trb && dlt <= trb && dlt > trb - resist.integer)
235 *h = rb - trb, snapy = t;
241 /* snap to screen edges */
244 case Corner_TopRight:
246 drb = rb + *h - c->frame->area.height;
247 if (rb <= ab && drb > ab && drb <= ab + resist.integer)
250 case Corner_BottomLeft:
251 case Corner_BottomRight:
252 dlt = lt - *h + c->frame->area.height;
254 if (lt >= at && dlt < at && dlt >= at - resist.integer)
259 /* round down for size increments */
260 *w -= c->frame->area.width + c->frame->size.left + c->frame->size.right;
261 *w = *w / c->size_inc.width * c->size_inc.width;
262 *w += c->frame->area.width + c->frame->size.left + c->frame->size.right;
264 *h -= c->frame->area.height + c->frame->size.top + c->frame->size.bottom;
265 *h = *h / c->size_inc.height * c->size_inc.height;
266 *h += c->frame->area.height + c->frame->size.top + c->frame->size.bottom;
269 static void event(ObEvent *e, void *foo)
271 if (e->type == Event_Client_Moving)
272 resist_move(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
273 else if (e->type == Event_Client_Resizing)
274 resist_size(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1],
278 void plugin_startup()
280 dispatch_register(Event_Client_Moving | Event_Client_Resizing,
281 (EventHandler)event, NULL);
284 void plugin_shutdown()
286 dispatch_register(0, (EventHandler)event, NULL);