From 3d9759b356da30bf8df209663f566bdc3f6c9d73 Mon Sep 17 00:00:00 2001
From: bakkeby <bakkeby@gmail.com>
Date: Wed, 26 Aug 2020 09:56:20 +0200
Subject: [PATCH] Warp: warps the mouse cursor to the center of the currently
 focused window or screen when the mouse cursor is (a) on a different screen
 or (b) on top of a different window.

If you are using barmodules then you may want to have a look at the warp function here:
https://github.com/bakkeby/dwm-flexipatch/blob/master/patch/warp.c
---
 dwm.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/dwm.c b/dwm.c
index 4465af1..6270438 100644
--- a/dwm.c
+++ b/dwm.c
@@ -227,6 +227,7 @@ static void updatetitle(Client *c);
 static void updatewindowtype(Client *c);
 static void updatewmhints(Client *c);
 static void view(const Arg *arg);
+static void warp(const Client *c);
 static Client *wintoclient(Window w);
 static Monitor *wintomon(Window w);
 static int xerror(Display *dpy, XErrorEvent *ee);
@@ -827,6 +828,7 @@ focusmon(const Arg *arg)
 	unfocus(selmon->sel, 0);
 	selmon = m;
 	focus(NULL);
+	warp(selmon->sel);
 }
 
 void
@@ -1367,6 +1369,8 @@ restack(Monitor *m)
 	}
 	XSync(dpy, False);
 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
+	if (m == selmon && (m->tagset[m->seltags] & m->sel->tags) && m->lt[m->sellt]->arrange != &monocle)
+		warp(m->sel);
 }
 
 void
@@ -2044,6 +2048,28 @@ view(const Arg *arg)
 	arrange(selmon);
 }
 
+void
+warp(const Client *c)
+{
+	int x, y;
+
+	if (!c) {
+		XWarpPointer(dpy, None, root, 0, 0, 0, 0, selmon->wx + selmon->ww / 2, selmon->wy + selmon->wh / 2);
+		return;
+	}
+
+	if (!getrootptr(&x, &y) ||
+		(x > c->x - c->bw &&
+		 y > c->y - c->bw &&
+		 x < c->x + c->w + c->bw*2 &&
+		 y < c->y + c->h + c->bw*2) ||
+		(y > c->mon->by && y < c->mon->by + bh) ||
+		(c->mon->topbar && !y))
+		return;
+
+	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w / 2, c->h / 2);
+}
+
 Client *
 wintoclient(Window w)
 {
-- 
2.19.1