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-rw-r--r--plugins/resistance/resistance.c275
1 files changed, 275 insertions, 0 deletions
diff --git a/plugins/resistance/resistance.c b/plugins/resistance/resistance.c
new file mode 100644
index 00000000..91c10c0e
--- /dev/null
+++ b/plugins/resistance/resistance.c
@@ -0,0 +1,275 @@
+#include "kernel/dispatch.h"
+#include "kernel/client.h"
+#include "kernel/frame.h"
+#include "kernel/stacking.h"
+#include "kernel/screen.h"
+#include "parser/parse.h"
+#include "resistance.h"
+#include <glib.h>
+
+static int resistance;
+static gboolean resist_windows;
+
+static void parse_xml(xmlDocPtr doc, xmlNodePtr node, void *d)
+{
+ xmlNodePtr n;
+
+ if ((n = parse_find_node("strength", node)))
+ resistance = parse_int(doc, n);
+ if ((n = parse_find_node("windows", node)))
+ resist_windows = parse_bool(doc, n);
+}
+
+void plugin_setup_config()
+{
+ resistance = DEFAULT_RESISTANCE;
+ resist_windows = DEFAULT_RESIST_WINDOWS;
+
+ parse_register("resistance", parse_xml, NULL);
+}
+
+static void resist_move(Client *c, int *x, int *y)
+{
+ GList *it;
+ Rect *area;
+ int l, t, r, b; /* requested edges */
+ int al, at, ar, ab; /* screen area edges */
+ int cl, ct, cr, cb; /* current edges */
+ int w, h; /* current size */
+ Client *snapx = NULL, *snapy = NULL;
+
+ w = c->frame->area.width;
+ h = c->frame->area.height;
+
+ l = *x;
+ t = *y;
+ r = l + w - 1;
+ b = t + h - 1;
+
+ cl = c->frame->area.x;
+ ct = c->frame->area.y;
+ cr = cl + c->frame->area.width - 1;
+ cb = ct + c->frame->area.height - 1;
+
+ /* snap to other clients */
+ if (resist_windows)
+ for (it = stacking_list; it != NULL; it = it->next) {
+ Client *target;
+ int tl, tt, tr, tb; /* 1 past the target's edges on each side */
+
+ if (!WINDOW_IS_CLIENT(it->data))
+ continue;
+ target = it->data;
+ /* don't snap to self or non-visibles */
+ if (!target->frame->visible || target == c) continue;
+
+ tl = target->frame->area.x - 1;
+ tt = target->frame->area.y - 1;
+ tr = tl + target->frame->area.width + 1;
+ tb = tt + target->frame->area.height + 1;
+
+ /* snapx and snapy ensure that the window snaps to the top-most
+ window edge available, without going all the way from
+ bottom-to-top in the stacking list
+ */
+ if (snapx == NULL) {
+ if (ct < tb && cb > tt) {
+ if (cl >= tr && l < tr && l >= tr - resistance)
+ *x = tr, snapx = target;
+ else if (cr <= tl && r > tl && r <= tl + resistance)
+ *x = tl - w + 1, snapx = target;
+ if (snapx != NULL) {
+ /* try to corner snap to the window */
+ if (ct > tt && t <= tt && t > tt - resistance)
+ *y = tt + 1, snapy = target;
+ else if (cb < tb && b >= tb && b < tb + resistance)
+ *y = tb - h, snapy = target;
+ }
+ }
+ }
+ if (snapy == NULL) {
+ if (cl < tr && cr > tl) {
+ if (ct >= tb && t < tb && t >= tb - resistance)
+ *y = tb, snapy = target;
+ else if (cb <= tt && b > tt && b <= tt + resistance)
+ *y = tt - h + 1, snapy = target;
+ if (snapy != NULL) {
+ /* try to corner snap to the window */
+ if (cl > tl && l <= tl && l > tl - resistance)
+ *x = tl + 1, snapx = target;
+ else if (cr < tr && r >= tr && r < tr + resistance)
+ *x = tr - w, snapx = target;
+ }
+ }
+ }
+
+ if (snapx && snapy) break;
+ }
+
+ /* 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 screen edges */
+ if (cl >= al && l < al && l >= al - resistance)
+ *x = al;
+ else if (cr <= ar && r > ar && r <= ar + resistance)
+ *x = ar - w + 1;
+ if (ct >= at && t < at && t >= at - resistance)
+ *y = at;
+ else if (cb <= ab && b > ab && b < ab + resistance)
+ *y = ab - h + 1;
+}
+
+static void resist_size(Client *c, int *w, int *h, Corner corn)
+{
+ 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;
+
+ /* don't snap windows with size increments */
+ if (c->size_inc.width > 1 || c->size_inc.height > 1)
+ return;
+
+ 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 (resist_windows) {
+ for (it = stacking_list; it != NULL; it = it->next) {
+ if (!WINDOW_IS_CLIENT(it->data))
+ continue;
+ 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 + resistance)
+ *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 - resistance)
+ *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 + resistance)
+ *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 - resistance)
+ *h = b - tb, snapy = target;
+ break;
+ }
+ }
+ }
+
+ /* snapped both ways */
+ if (snapx && snapy) break;
+ }
+ }
+
+ /* snap to screen edges */
+
+ /* horizontal snapping */
+ switch (corn) {
+ case Corner_TopLeft:
+ case Corner_BottomLeft:
+ dlt = l;
+ drb = r + *w - c->frame->area.width;
+ if (r <= ar && drb > ar && drb <= ar + resistance)
+ *w = ar - l + 1;
+ break;
+ case Corner_TopRight:
+ case Corner_BottomRight:
+ dlt = l - *w + c->frame->area.width;
+ drb = r;
+ if (l >= al && dlt < al && dlt >= al - resistance)
+ *w = r - al + 1;
+ break;
+ }
+
+ /* vertical snapping */
+ switch (corn) {
+ case Corner_TopLeft:
+ case Corner_TopRight:
+ dlt = t;
+ drb = b + *h - c->frame->area.height;
+ if (b <= ab && drb > ab && drb <= ab + resistance)
+ *h = ab - t + 1;
+ break;
+ case Corner_BottomLeft:
+ case Corner_BottomRight:
+ dlt = t - *h + c->frame->area.height;
+ drb = b;
+ if (t >= at && dlt < at && dlt >= at - resistance)
+ *h = b - at + 1;
+ break;
+ }
+}
+
+static void event(ObEvent *e, void *foo)
+{
+ if (e->type == Event_Client_Moving)
+ resist_move(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1]);
+ else if (e->type == Event_Client_Resizing)
+ resist_size(e->data.c.client, &e->data.c.num[0], &e->data.c.num[1],
+ e->data.c.num[2]);
+}
+
+void plugin_startup()
+{
+ dispatch_register(Event_Client_Moving | Event_Client_Resizing,
+ (EventHandler)event, NULL);
+}
+
+void plugin_shutdown()
+{
+ dispatch_register(0, (EventHandler)event, NULL);
+}
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