From 39647ff8b155bdff072e32d04ca4e1c5e27873d5 Mon Sep 17 00:00:00 2001
From: Bakkeby <bakkeby@gmail.com>
Date: Mon, 10 Jan 2022 11:22:21 +0100
Subject: [PATCH 2/2] The dragcfact patch allow you resize clients' size (i.e. 
 modify cfact) by holding modkey + shift + right-click and dragging the mouse.

---
 config.def.h |  1 +
 dwm.c        | 94 ++++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 89 insertions(+), 6 deletions(-)

diff --git a/config.def.h b/config.def.h
index 5b0cfde..595cf43 100644
--- a/config.def.h
+++ b/config.def.h
@@ -111,6 +111,7 @@ static Button buttons[] = {
 	{ ClkClientWin,         MODKEY,         Button1,        movemouse,      {0} },
 	{ ClkClientWin,         MODKEY,         Button2,        togglefloating, {0} },
 	{ ClkClientWin,         MODKEY,         Button3,        resizemouse,    {0} },
+	{ ClkClientWin,         MODKEY|ShiftMask, Button3,      dragcfact,      {0} },
 	{ ClkTagBar,            0,              Button1,        view,           {0} },
 	{ ClkTagBar,            0,              Button3,        toggleview,     {0} },
 	{ ClkTagBar,            MODKEY,         Button1,        tag,            {0} },
diff --git a/dwm.c b/dwm.c
index bcb155d..54f7320 100644
--- a/dwm.c
+++ b/dwm.c
@@ -162,6 +162,7 @@ static void destroynotify(XEvent *e);
 static void detach(Client *c);
 static void detachstack(Client *c);
 static Monitor *dirtomon(int dir);
+static void dragcfact(const Arg *arg);
 static void drawbar(Monitor *m);
 static void drawbars(void);
 static void enternotify(XEvent *e);
@@ -695,6 +696,81 @@ dirtomon(int dir)
 	return m;
 }
 
+void
+dragcfact(const Arg *arg)
+{
+	int prev_x, prev_y, dist_x, dist_y;
+	float fact;
+	Client *c;
+	XEvent ev;
+	Time lasttime = 0;
+
+	if (!(c = selmon->sel))
+		return;
+	if (c->isfloating) {
+		resizemouse(arg);
+		return;
+	}
+	#if !FAKEFULLSCREEN_PATCH
+	#if FAKEFULLSCREEN_CLIENT_PATCH
+	if (c->isfullscreen && !c->fakefullscreen) /* no support resizing fullscreen windows by mouse */
+		return;
+	#else
+	if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
+		return;
+	#endif // FAKEFULLSCREEN_CLIENT_PATCH
+	#endif // !FAKEFULLSCREEN_PATCH
+	restack(selmon);
+
+	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
+		None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
+		return;
+	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w/2, c->h/2);
+
+	prev_x = prev_y = -999999;
+
+	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 / 60))
+				continue;
+			lasttime = ev.xmotion.time;
+			if (prev_x == -999999) {
+				prev_x = ev.xmotion.x_root;
+				prev_y = ev.xmotion.y_root;
+			}
+
+			dist_x = ev.xmotion.x - prev_x;
+			dist_y = ev.xmotion.y - prev_y;
+
+			if (abs(dist_x) > abs(dist_y)) {
+				fact = (float) 4.0 * dist_x / c->mon->ww;
+			} else {
+				fact = (float) -4.0 * dist_y / c->mon->wh;
+			}
+
+			if (fact)
+				setcfact(&((Arg) { .f = fact }));
+
+			prev_x = ev.xmotion.x;
+			prev_y = ev.xmotion.y;
+			break;
+		}
+	} while (ev.type != ButtonRelease);
+
+
+	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w/2, c->h/2);
+
+	XUngrabPointer(dpy, CurrentTime);
+	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
+}
+
 void
 drawbar(Monitor *m)
 {
@@ -1519,19 +1595,25 @@ setlayout(const Arg *arg)
 }
 
 void
-setcfact(const Arg *arg) {
+setcfact(const Arg *arg)
+{
 	float f;
 	Client *c;
 
 	c = selmon->sel;
 
-	if(!arg || !c || !selmon->lt[selmon->sellt]->arrange)
+	if (!arg || !c || !selmon->lt[selmon->sellt]->arrange)
 		return;
-	f = arg->f + c->cfact;
-	if(arg->f == 0.0)
+	if (!arg->f)
 		f = 1.0;
-	else if(f < 0.25 || f > 4.0)
-		return;
+	else if (arg->f > 4.0) // set fact absolutely
+		f = arg->f - 4.0;
+	else
+		f = arg->f + c->cfact;
+	if (f < 0.25)
+		f = 0.25;
+	else if (f > 4.0)
+		f = 4.0;
 	c->cfact = f;
 	arrange(selmon);
 }
-- 
2.19.1