From 6ff7f20633bd60e6a4a71170d6837659547ef068 Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Sat, 3 Feb 2024 01:12:00 -0500
Subject: Smarter warp direction, allow ctrl plus any mod key to override.

---
 xdeadzone.c | 53 ++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 42 insertions(+), 11 deletions(-)

diff --git a/xdeadzone.c b/xdeadzone.c
index 3d7bc78..376794f 100644
--- a/xdeadzone.c
+++ b/xdeadzone.c
@@ -67,16 +67,25 @@ int streq(const char *s1, const char *s2) {
 	return !strcmp(s1, s2);
 }
 
+/* return true if control + any of the Mod[1-5] are both pressed. */
+int ctrl_and_mod(unsigned int state) {
+	if(state & ControlMask)
+		if(state & (Mod1Mask | Mod2Mask | Mod3Mask | Mod4Mask | Mod5Mask))
+			return 1;
+	return 0;
+}
+
 int main(int argc, char **argv) {
 	Display *d;
 	Window w;
 	XEvent ev;
 	Atom dock_atom;
-	XWindowAttributes attr;
+	XWindowAttributes root_attr;
 	XSetWindowAttributes setattr;
 
 	int x = -1, y = -1, gflags = -1, visible = 0, black = 0, mode = M_UNSET, normal_window = 0;
 	unsigned int width, height;
+	int new_x, new_y;
 
 	set_exe_name(argv[0]);
 
@@ -160,17 +169,17 @@ int main(int argc, char **argv) {
 	if(!(d = XOpenDisplay(NULL)))
 		errmsg("can't open X display");
 
-	XGetWindowAttributes(d, DefaultRootWindow(d), &attr);
+	XGetWindowAttributes(d, DefaultRootWindow(d), &root_attr);
 	if(mode == M_ABS) {
-		if(gflags & XNegative) x = (attr.width  + x) - width;
-		if(gflags & YNegative) y = (attr.height + y) - height;
+		if(gflags & XNegative) x = (root_attr.width  + x) - width;
+		if(gflags & YNegative) y = (root_attr.height + y) - height;
 	} else {
-		if(x < 0) x = (attr.width  + x);
-		if(y < 0) y = (attr.height + y);
+		if(x < 0) x = (root_attr.width  + x);
+		if(y < 0) y = (root_attr.height + y);
 	}
 
 	DBG(printf("X size %d x %d, x %d, y %d, width %d, height %d\n",
-				attr.width, attr.height, x, y, width, height));
+				root_attr.width, root_attr.height, x, y, width, height));
 
 	/* Create window with override_redirect enabled, to tell the window
 		manager not to decorate it with a titlebar or resize frame.
@@ -228,17 +237,39 @@ int main(int argc, char **argv) {
 	DBG(printf("awaiting EnterNotify events...\n"));
 	while(1) {
 		XNextEvent(d, &ev);
-		if(ev.type == EnterNotify) {
-			/* warp down if at top of screen */
-			int new_y = (y == 0 ? y + height : y - 1);
+		if(ev.type == EnterNotify && !ctrl_and_mod(ev.xcrossing.state)) {
+			new_x = ev.xcrossing.x_root;
+			new_y = ev.xcrossing.y_root;
+
+			/* Where do we warp the pointer to?
+				It would be better if we had a way to find out
+				the previous pointer position, so we could know which
+				direction it's moving. But, in the specific (but usual) case
+				of deadzones in the corner of the screen, the dumb logic
+				below is good enough. */
+
+			if(height < root_attr.height) {
+				/* window is less than full height of the screen, warp vertically */
+				if(y == 0)
+					new_y = height; /* it's at the top, warp down. */
+				else
+					new_y = y - 1;  /* it's not at the top, warp up */
+			} else {
+				/* window *is* full height of the screen, have to warp horizonally */
+				if(x == 0)
+					new_x = width;  /* it's at the left edge, warp right */
+				else
+					new_x = x - 1;  /* it's not at the left edge, warp left */
+			}
 
 			DBG(printf("Got EnterNotify, coords %d, %d, new Y is %d\n",
 						ev.xcrossing.x_root, ev.xcrossing.y_root, new_y));
+
 			XWarpPointer(d,
 					None,
 					DefaultRootWindow(d),
 					0, 0, 0, 0,
-					ev.xcrossing.x_root,
+					new_x,
 					new_y);
 		}
 	}
-- 
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