+ GList *it;
+ Client *target; /* target */
+ int l, t, r, b; /* my left, top, right and bottom sides */
+ int dlt, drb; /* my destination left/top and right/bottom sides */
+ int tl, tt, tr, tb; /* target's left, top, right and bottom bottom sides */
+ Rect *area;
+ int al, at, ar, ab; /* screen boundaries */
+ Client *snapx = NULL, *snapy = NULL;
+ ConfigValue resist, window_resist;
+
+ if (!config_get("resistance", Config_Integer, &resist) ||
+ resist.integer < 0) {
+ resist.integer = DEFAULT_RESISTANCE;
+ config_set("resistance", Config_Integer, resist);
+ }
+ if (!config_get("resistance.windows", Config_Bool, &window_resist))
+ g_assert_not_reached();
+
+ l = c->frame->area.x;
+ r = l + c->frame->area.width - 1;
+ t = c->frame->area.y;
+ b = t + c->frame->area.height - 1;
+
+ /* get the screen boundaries */
+ area = screen_area(c->desktop);
+ al = area->x;
+ at = area->y;
+ ar = al + area->width - 1;
+ ab = at + area->height - 1;
+
+ /* snap to other windows */
+ if (window_resist.bool) {
+ for (it = stacking_list; it != NULL; it = it->next) {
+ target = it->data;
+
+ /* don't snap to invisibles or ourself */
+ if (!target->frame->visible || target == c) continue;
+
+ tl = target->frame->area.x;
+ tr = target->frame->area.x + target->frame->area.width - 1;
+ tt = target->frame->area.y;
+ tb = target->frame->area.y + target->frame->area.height - 1;
+
+ if (snapx == NULL) {
+ /* horizontal snapping */
+ if (t < tb && b > tt) {
+ switch (corn) {
+ case Corner_TopLeft:
+ case Corner_BottomLeft:
+ dlt = l;
+ drb = r + *w - c->frame->area.width;
+ if (r < tl && drb >= tl && drb < tl + resist.integer)
+ *w = tl - l, snapx = target;
+ break;
+ case Corner_TopRight:
+ case Corner_BottomRight:
+ dlt = l - *w + c->frame->area.width;
+ drb = r;
+ if (l > tr && dlt <= tr && dlt > tr - resist.integer)
+ *w = r - tr, snapx = target;
+ break;
+ }
+ }
+ }
+
+ if (snapy == NULL) {
+ /* vertical snapping */
+ if (l < tr && r > tl) {
+ switch (corn) {
+ case Corner_TopLeft:
+ case Corner_TopRight:
+ dlt = t;
+ drb = b + *h - c->frame->area.height;
+ if (b < tt && drb >= tt && drb < tt + resist.integer)
+ *h = tt - t, snapy = target;
+ break;
+ case Corner_BottomLeft:
+ case Corner_BottomRight:
+ dlt = t - *h + c->frame->area.height;
+ drb = b;
+ if (t > tb && dlt <= tb && dlt > tb - resist.integer)
+ *h = b - tb, snapy = target;
+ break;
+ }
+ }
+ }
+
+ /* snapped both ways */
+ if (snapx && snapy) break;
+ }
+ }