From d781863fb98f066d1ad98b573796d0880b48af8f Mon Sep 17 00:00:00 2001
From: verschmelzen <ivan.komarov@protonmail.com>
Date: Wed, 19 Aug 2020 00:05:34 +0300
Subject: [PATCH] Resize windows with touchpad two-finger scroll

This patch allows to resize windows using mouse scroll events. Since
there is no right-click-tap-to-drag I found this patch to be the only
way to be able to both move and resize windows with touchpad.
---
 config.def.h | 16 ++++++++++++++++
 dwm.c        | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)

diff --git a/config.def.h b/config.def.h
index 1c0b587..d7d208f 100644
--- a/config.def.h
+++ b/config.def.h
@@ -36,6 +36,9 @@ static const float mfact     = 0.55; /* factor of master area size [0.05..0.95]
 static const int nmaster     = 1;    /* number of clients in master area */
 static const int resizehints = 1;    /* 1 means respect size hints in tiled resizals */
 
+/* mouse scroll resize */
+static const int scrollsensetivity = 30; /* 1 means resize window by 1 pixel for each scroll event */
+
 static const Layout layouts[] = {
 	/* symbol     arrange function */
 	{ "[]=",      tile },    /* first entry is default */
@@ -96,6 +99,15 @@ static Key keys[] = {
 	{ MODKEY|ShiftMask,             XK_q,      quit,           {0} },
 };
 
+/* resizemousescroll direction argument list */
+static const int scrollargs[][2] = {
+	/* width change         height change */
+	{ +scrollsensetivity,	0 },
+	{ -scrollsensetivity,	0 },
+	{ 0, 				  	+scrollsensetivity },
+	{ 0, 					-scrollsensetivity },
+};
+
 /* button definitions */
 /* click can be ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle, ClkClientWin, or ClkRootWin */
 static Button buttons[] = {
@@ -107,6 +119,10 @@ static Button buttons[] = {
 	{ ClkClientWin,         MODKEY,         Button1,        movemouse,      {0} },
 	{ ClkClientWin,         MODKEY,         Button2,        togglefloating, {0} },
 	{ ClkClientWin,         MODKEY,         Button3,        resizemouse,    {0} },
+	{ ClkClientWin,         MODKEY,         Button4,        resizemousescroll, {.v = &scrollargs[0]} },
+	{ ClkClientWin,         MODKEY,         Button5,        resizemousescroll, {.v = &scrollargs[1]} },
+	{ ClkClientWin,         MODKEY,         Button6,        resizemousescroll, {.v = &scrollargs[2]} },
+	{ ClkClientWin,         MODKEY,         Button7,        resizemousescroll, {.v = &scrollargs[3]} },
 	{ ClkTagBar,            0,              Button1,        view,           {0} },
 	{ ClkTagBar,            0,              Button3,        toggleview,     {0} },
 	{ ClkTagBar,            MODKEY,         Button1,        tag,            {0} },
diff --git a/dwm.c b/dwm.c
index 9fd0286..30f14db 100644
--- a/dwm.c
+++ b/dwm.c
@@ -57,6 +57,12 @@
 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
 
+/* Undefined in X11/X.h buttons that are actualy exist and correspond to
+ * horizontal scroll
+ */
+#define Button6			6
+#define Button7			7
+
 /* enums */
 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
 enum { SchemeNorm, SchemeSel }; /* color schemes */
@@ -192,6 +198,7 @@ static Monitor *recttomon(int x, int y, int w, int h);
 static void resize(Client *c, int x, int y, int w, int h, int interact);
 static void resizeclient(Client *c, int x, int y, int w, int h);
 static void resizemouse(const Arg *arg);
+static void resizemousescroll(const Arg *arg);
 static void restack(Monitor *m);
 static void run(void);
 static void scan(void);
@@ -1345,6 +1352,45 @@ resizemouse(const Arg *arg)
 	}
 }
 
+void
+resizemousescroll(const Arg *arg)
+{
+	int nw, nh;
+	Client *c;
+	Monitor *m;
+	XEvent ev;
+	int dw = *((int*)arg->v + 1);
+	int dh = *(int*)arg->v;
+
+	if (!(c = selmon->sel))
+		return;
+	if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
+		return;
+	restack(selmon);
+	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
+		None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
+		return;
+	nw = MAX(c->w + dw, 1);
+	nh = MAX(c->h + dh, 1);
+	if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
+	&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
+	{
+		if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
+		&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
+			togglefloating(NULL);
+	}
+	if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
+		resize(c, c->x, c->y, nw, nh, 1);
+	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
+	XUngrabPointer(dpy, CurrentTime);
+	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
+	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
+		sendmon(c, m);
+		selmon = m;
+		focus(NULL);
+	}
+}
+
 void
 restack(Monitor *m)
 {
-- 
2.28.0