From 2bb0b9d6c5edd7c4127c971f5ccebed969f86c1c Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Fri, 13 Aug 2021 06:52:51 +0000
Subject: Change focus to be driven by events rather than walking all panes at
 end of event loop, this way the ordering of in and out can be enforced.
 GitHub issue 2808.

---
 window.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

(limited to 'window.c')

diff --git a/window.c b/window.c
index f94acfcb..446898cb 100644
--- a/window.c
+++ b/window.c
@@ -458,6 +458,52 @@ window_has_pane(struct window *w, struct window_pane *wp)
 	return (0);
 }
 
+void
+window_update_focus(struct window *w)
+{
+	if (w != NULL) {
+		log_debug("%s: @%u", __func__, w->id);
+		window_pane_update_focus(w->active);
+	}
+}
+
+void
+window_pane_update_focus(struct window_pane *wp)
+{
+	struct client	*c;
+	int		 focused = 0;
+
+	if (wp != NULL) {
+		if (wp != wp->window->active)
+			focused = 0;
+		else {
+			TAILQ_FOREACH(c, &clients, entry) {
+				if (c->session != NULL &&
+				    c->session->attached != 0 &&
+				    (c->flags & CLIENT_FOCUSED) &&
+				    c->session->curw->window == wp->window) {
+					focused = 1;
+					break;
+				}
+			}
+		}
+		if (!focused && (wp->flags & PANE_FOCUSED)) {
+			log_debug("%s: %%%u focus out", __func__, wp->id);
+			if (wp->base.mode & MODE_FOCUSON)
+				bufferevent_write(wp->event, "\033[O", 3);
+			notify_pane("pane-focus-out", wp);
+			wp->flags &= ~PANE_FOCUSED;
+		} else if (focused && (~wp->flags & PANE_FOCUSED)) {
+			log_debug("%s: %%%u focus in", __func__, wp->id);
+			if (wp->base.mode & MODE_FOCUSON)
+				bufferevent_write(wp->event, "\033[I", 3);
+			notify_pane("pane-focus-in", wp);
+			wp->flags |= PANE_FOCUSED;
+		} else
+			log_debug("%s: %%%u focus unchanged", __func__, wp->id);
+	}
+}
+
 int
 window_set_active_pane(struct window *w, struct window_pane *wp, int notify)
 {
@@ -471,6 +517,11 @@ window_set_active_pane(struct window *w, struct window_pane *wp, int notify)
 	w->active->active_point = next_active_point++;
 	w->active->flags |= PANE_CHANGED;
 
+	if (options_get_number(global_options, "focus-events")) {
+		window_pane_update_focus(w->last);
+		window_pane_update_focus(w->active);
+	}
+
 	tty_update_window_offset(w);
 
 	if (notify)
-- 
cgit