From a52cdcaaf6029bec5cb88cd975e10a9d354b7426 Mon Sep 17 00:00:00 2001
From: Ryan McBride <mcbride@countersiege.com>
Date: Wed, 4 Mar 2009 06:13:35 +0000
Subject: [PATCH] Handle focus-out events, watch for something that looks like
 synergy stealing the cursor when it moves to another
 screen, and unfocus the window if this happens. Makes
 synergy across multiple scrotwm machines much nicer, as you
 only get the focus window border on one screen at a time.

Also, unfocus_all is a sledgehammer, don't use it so much.
---
 scrotwm.c |   75 ++++++++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 60 insertions(+), 15 deletions(-)

diff --git a/scrotwm.c b/scrotwm.c
index 64366e9..12b4265 100644
--- a/scrotwm.c
+++ b/scrotwm.c
@@ -377,6 +377,7 @@ void			configurenotify(XEvent *);
 void			destroynotify(XEvent *);
 void			enternotify(XEvent *);
 void			focusin(XEvent *);
+void			focusout(XEvent *);
 void			mappingnotify(XEvent *);
 void			maprequest(XEvent *);
 void			propertynotify(XEvent *);
@@ -392,6 +393,7 @@ void			(*handler[LASTEvent])(XEvent *) = {
 				[DestroyNotify] = destroynotify,
 				[EnterNotify] = enternotify,
 				[FocusIn] = focusin,
+				[FocusOut] = focusout,
 				[MappingNotify] = mappingnotify,
 				[MapRequest] = maprequest,
 				[PropertyNotify] = propertynotify,
@@ -1069,6 +1071,28 @@ spawnmenu(struct swm_region *r, union arg *args)
 }
 
 void
+unfocus_win(struct ws_win *win)
+{
+	if (win == NULL)
+		return;
+
+	if (win->ws->focus != win && win->ws->focus != NULL)
+		win->ws->focus_prev = win->ws->focus;
+
+	if (win->ws->r == NULL)
+		return;
+
+	grabbuttons(win, 0);
+	XSetWindowBorder(display, win->id,
+	    win->ws->r->s->c[SWM_S_COLOR_UNFOCUS].color);
+	win->got_focus = 0;
+	if (win->ws->focus == win)
+		win->ws->focus = NULL;
+	if (cur_focus == win)
+		cur_focus = NULL;
+}
+
+void
 unfocus_all(void)
 {
 	struct ws_win		*win;
@@ -1078,16 +1102,8 @@ unfocus_all(void)
 
 	for (i = 0; i < ScreenCount(display); i++)
 		for (j = 0; j < SWM_WS_MAX; j++)
-			TAILQ_FOREACH(win, &screens[i].ws[j].winlist, entry) {
-				if (win->ws->r == NULL)
-					continue;
-				grabbuttons(win, 0);
-				XSetWindowBorder(display, win->id,
-				    win->ws->r->s->c[SWM_S_COLOR_UNFOCUS].color);
-				win->got_focus = 0;
-				win->ws->focus = NULL;
-				cur_focus = NULL;
-			}
+			TAILQ_FOREACH(win, &screens[i].ws[j].winlist, entry)
+				unfocus_win(win);
 }
 
 void
@@ -1098,10 +1114,14 @@ focus_win(struct ws_win *win)
 	if (win == NULL)
 		return;
 
-	if (win->ws->focus != win && win->ws->focus != NULL)
-		win->ws->focus_prev = win->ws->focus;
-
-	unfocus_all();
+	if (cur_focus)
+		unfocus_win(cur_focus);
+	if (win->ws->focus) {
+		/* probably shouldn't happen due to the previous unfocus_win */
+		DNPRINTF(SWM_D_FOCUS, "unfocusing win->ws->focus: %lu\n",
+		    win->ws->focus->id);
+		unfocus_win(win->ws->focus);
+	}
 	win->ws->focus = win;
 	if (win->ws->r != NULL) {
 		cur_focus = win;
@@ -1156,6 +1176,8 @@ switchws(struct swm_region *r, union arg *args)
 
 	ignore_enter = 1;
 	/* set focus */
+	if (new_ws->focus == NULL)
+		new_ws->focus = TAILQ_FIRST(&new_ws->winlist);
 	if (new_ws->focus)
 		focus_win(new_ws->focus);
 	stack();
@@ -2410,7 +2432,7 @@ unmanage_window(struct ws_win *win)
 		ws->focus = TAILQ_FIRST(&ws->winlist);
 	if (ws->focus == NULL || ws->focus == win) {
 		ws->focus = NULL;
-		unfocus_all();
+		unfocus_win(win);
 	} else
 		focus_win(ws->focus);
 	if (ws->focus_prev == win)
@@ -2543,6 +2565,29 @@ focusin(XEvent *e)
 }
 
 void
+focusout(XEvent *e)
+{
+	DNPRINTF(SWM_D_EVENT, "focusout: window: %lu\n", e->xfocus.window);
+
+	if (cur_focus && cur_focus->ws->r &&
+	    cur_focus->id == e->xfocus.window) {
+		struct swm_screen	*s = cur_focus->ws->r->s;
+		Window			rr, cr;
+		int			x, y, wx, wy;
+		unsigned int		mask;
+
+		/* Try to detect synergy hiding the cursor.  */
+		if (XQueryPointer(display, cur_focus->id, 
+		    &rr, &cr, &x, &y, &wx, &wy, &mask) != False &&
+		    cr == 0 && !mask &&
+		    x == DisplayWidth(display, s->idx)/2 &&
+		    y == DisplayHeight(display, s->idx)/2) {
+			unfocus_win(cur_focus);
+		}
+	}
+}
+
+void
 mappingnotify(XEvent *e)
 {
 	XMappingEvent		*ev = &e->xmapping;
-- 
1.7.10.4