support monitors above and below in focusmon and tagmon

Fixes https://codeberg.org/dwl/dwl/issues/1105

README.md

@@ -153,7 +153,6 @@ given the base on which it is built. Implemented default features are:
 - Support screen lockers via ext-session-lock-v1 protocol
 - Various Wayland protocols
 - XWayland support as provided by wlroots (can be enabled in `config.mk`)
-- Zero flickering - Wayland users naturally expect that "every frame is perfect"
 - Layer shell popups (used by Waybar)
 - Damage tracking provided by scenegraph API
 

config.def.h

@@ -170,3 +170,8 @@ static const Button buttons[] = {
 	{ MODKEY, BTN_MIDDLE, togglefloating, {0} },
 	{ MODKEY, BTN_RIGHT,  moveresize,     {.ui = CurResize} },
 };
+
+static const Axis axes[] = {
+	{ MODKEY, AxisUp,   spawn, SHCMD("volume-up_EXAMPLE") },
+	{ MODKEY, AxisDown, spawn, SHCMD("volume-down_EXAMPLE") },
+};

dwl.c

@@ -86,6 +86,7 @@
 enum { CurNormal, CurPressed, CurMove, CurResize }; /* cursor */
 enum { XDGShell, LayerShell, X11 }; /* client types */
 enum { LyrBg, LyrBottom, LyrTile, LyrFloat, LyrTop, LyrFS, LyrOverlay, LyrIMPopup, LyrBlock, NUM_LAYERS }; /* scene layers */
+enum { AxisUp, AxisRight, AxisDown, AxisLeft };
 
 typedef union {
 	int i;
@@ -94,6 +95,13 @@ typedef union {
 	const void *v;
 } Arg;
 
+typedef struct {
+	unsigned int mod;
+	unsigned int dir;
+	void (*func)(const Arg *);
+	const Arg arg;
+} Axis;
+
 typedef struct {
 	unsigned int mod;
 	unsigned int button;
@@ -628,9 +636,26 @@ axisnotify(struct wl_listener *listener, void *data)
 	/* This event is forwarded by the cursor when a pointer emits an axis event,
 	 * for example when you move the scroll wheel. */
 	struct wlr_pointer_axis_event *event = data;
+	const Axis *a;
+	unsigned int adir;
+	struct wlr_keyboard *keyboard;
+	uint32_t mods;
+
 	wlr_idle_notifier_v1_notify_activity(idle_notifier, seat);
-	/* TODO: allow usage of scroll wheel for mousebindings, it can be implemented
-	 * by checking the event's orientation and the delta of the event */
+
+	if (event->orientation == WL_POINTER_AXIS_VERTICAL_SCROLL)
+		adir = event->delta > 0 ? AxisDown : AxisUp;
+	else
+		adir = event->delta > 0 ? AxisRight : AxisLeft;
+	keyboard = wlr_seat_get_keyboard(seat);
+	mods = keyboard ? wlr_keyboard_get_modifiers(keyboard) : 0;
+	for (a = axes; a < END(axes); a++) {
+		if (CLEANMASK(mods) == CLEANMASK(a->mod) && adir == a->dir && a->func) {
+			a->func(&a->arg);
+			return;
+		}
+	}
+
 	/* Notify the client with pointer focus of the axis event. */
 	wlr_seat_pointer_notify_axis(seat,
 			event->time_msec, event->orientation, event->delta,
@@ -678,10 +703,11 @@ buttonpress(struct wl_listener *listener, void *data)
 		break;
 	case WL_POINTER_BUTTON_STATE_RELEASED:
 		/* If you released any buttons, we exit interactive move/resize mode. */
-		/* TODO: should reset to the pointer focus's current setcursor */
 		if (!locked && cursor_mode != CurNormal && cursor_mode != CurPressed) {
-			wlr_cursor_set_xcursor(cursor, cursor_mgr, "default");
 			cursor_mode = CurNormal;
+			/* Update the cursor */
+			wlr_seat_pointer_clear_focus(seat);
+			motionnotify(0, NULL, 0, 0, 0, 0);
 			/* Drop the window off on its new monitor */
 			selmon = xytomon(cursor->x, cursor->y);
 			setmon(grabc, selmon, 0);
@@ -1448,7 +1474,8 @@ dirtomon(enum wlr_direction dir)
 			dir, selmon->wlr_output, selmon->m.x, selmon->m.y)))
 		return next->data;
 	if ((next = wlr_output_layout_farthest_output(output_layout,
-			dir ^ (WLR_DIRECTION_LEFT|WLR_DIRECTION_RIGHT),
+			dir ^ (WLR_DIRECTION_LEFT | WLR_DIRECTION_RIGHT |
+					WLR_DIRECTION_UP | WLR_DIRECTION_DOWN),
 			selmon->wlr_output, selmon->m.x, selmon->m.y)))
 		return next->data;
 	return selmon;