From 4aa7d94347b2dc940901d6e073a65df75ae04829 Mon Sep 17 00:00:00 2001
From: ProsperousPotato <ProsperousPotato@users.noreply.github.com>
Date: Wed, 31 Dec 2025 22:42:26 +0000
Subject: dragmfact with mouse

---
 config.h |   1 +
 dwm.c    | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 111 insertions(+), 1 deletion(-)

diff --git a/config.h b/config.h
index bee334d..bc83231 100644
--- a/config.h
+++ b/config.h
@@ -164,6 +164,7 @@ static const Button buttons[] = {
    	/* click                event mask         button          function        argument */
    	{ ClkClientWin,         MODKEY,            Button1,        movemouse,      {0} }, // regular window move
    	{ ClkClientWin,         MODKEY|ShiftMask,  Button1,        movemouse,      {.i = 1} }, // tiled window move
+	{ ClkClientWin,         MODKEY|ShiftMask,  Button3,        dragmfact,      {0} },
    	{ ClkClientWin,         MODKEY,            Button2,        togglefloating, {0} },
    	{ ClkClientWin,         MODKEY,            Button3,        resizemouse,    {0} },
 
diff --git a/dwm.c b/dwm.c
index 80e6c12..ec11435 100644
--- a/dwm.c
+++ b/dwm.c
@@ -62,7 +62,7 @@
 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
 
 /* enums */
-enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
+enum { CurNormal, CurResize, CurMove, CurResizeHorzArrow, CurResizeVertArrow, CurLast }; /* cursor */
 enum { SchemeNorm, SchemeSel }; /* color schemes */
 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
@@ -164,6 +164,7 @@ static void destroynotify(XEvent *e);
 static void detach(Client *c);
 static void detachstack(Client *c);
 static Monitor *dirtomon(int dir);
+static void dragmfact(const Arg *arg);
 static void enternotify(XEvent *e);
 static void focus(Client *c);
 static void focusin(XEvent *e);
@@ -696,6 +697,112 @@ destroynotify(XEvent *e)
 		unmanage(c->swallowing, 1);
 }
 
+void
+dragmfact(const Arg *arg)
+{
+	unsigned int n;
+	int py, px; // pointer coordinates
+	int ax, ay, aw, ah; // area position, width and height
+	int center = 0, horizontal = 0, mirror = 0, fixed = 0; // layout configuration
+	double fact;
+	Monitor *m;
+	XEvent ev;
+	Time lasttime = 0;
+
+	m = selmon;
+
+	Client *c;
+	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
+
+	ax = m->wx;
+	ay = m->wy;
+	ah = m->wh;
+	aw = m->ww;
+
+	if (!n)
+		return;
+
+	/* do not allow mfact to be modified under certain conditions */
+	if (!m->lt[m->sellt]->arrange                            // floating layout
+		|| (!fixed && m->nmaster && n <= m->nmaster)         // no master
+		|| m->lt[m->sellt]->arrange == &monocle)
+		return;
+
+	if (center) {
+		if (horizontal) {
+			px = ax + aw / 2;
+			py = ay + ah / 2 + ah * m->mfact / 2.0;
+		} else { // vertical split
+			px = ax + aw / 2 + aw * m->mfact / 2.0;
+			py = ay + ah / 2;
+		}
+	} else if (horizontal) {
+		px = ax + aw / 2;
+		if (mirror)
+			py = ay + (ah * (1.0 - m->mfact));
+		else
+			py = ay + (ah * m->mfact);
+	} else { // vertical split
+		if (mirror)
+			px = ax + (aw * m->mfact);
+		else
+			px = ax + (aw * m->mfact);
+		py = ay + ah / 2;
+	}
+
+	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
+		None, cursor[horizontal ? CurResizeVertArrow : CurResizeHorzArrow]->cursor, CurrentTime) != GrabSuccess)
+		return;
+	XWarpPointer(dpy, None, root, 0, 0, 0, 0, px, py);
+
+	do {
+		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
+		switch(ev.type) {
+		case ConfigureRequest:
+		case Expose:
+		case MapRequest:
+			handler[ev.type](&ev);
+			break;
+		case MotionNotify:
+			if ((ev.xmotion.time - lasttime) <= (1000 / 40))
+				continue;
+			if (lasttime != 0) {
+				px = ev.xmotion.x;
+				py = ev.xmotion.y;
+			}
+			lasttime = ev.xmotion.time;
+
+			if (center)
+				if (horizontal)
+					if (py - ay > ah / 2)
+						fact = (double) 1.0 - (ay + ah - py) * 2 / (double) ah;
+					else
+						fact = (double) 1.0 - (py - ay) * 2 / (double) ah;
+				else
+					if (px - ax > aw / 2)
+						fact = (double) 1.0 - (ax + aw - px) * 2 / (double) aw;
+					else
+						fact = (double) 1.0 - (px - ax) * 2 / (double) aw;
+			else
+				if (horizontal)
+					fact = (double) (py - ay) / (double) ah;
+				else
+					fact = (double) (px - ax) / (double) aw;
+
+			if (!center && mirror)
+				fact = 1.0 - fact;
+
+			setmfact(&((Arg) { .f = 1.0 + fact }));
+			px = ev.xmotion.x;
+			py = ev.xmotion.y;
+			break;
+		}
+	} while (ev.type != ButtonRelease);
+
+	XUngrabPointer(dpy, CurrentTime);
+	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
+}
+
 void
 detach(Client *c)
 {
@@ -1713,6 +1820,8 @@ setup(void)
 	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
 	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
 	cursor[CurMove] = drw_cur_create(drw, XC_fleur);
+	cursor[CurResizeHorzArrow] = drw_cur_create(drw, XC_sb_h_double_arrow);
+	cursor[CurResizeVertArrow] = drw_cur_create(drw, XC_sb_v_double_arrow);
 	/* init appearance */
 	scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
 	for (i = 0; i < LENGTH(colors); i++)
-- 
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