From acef311fe356f408690e9f94727ed63a934b742f Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Thu, 3 Apr 2014 08:20:29 +0000
Subject: [PATCH] Work out mouse scroll wheel effect when the mouse is first
 detected and store it in struct mouse_event, reduce the scroll size the 3 but
 allow shift to reduce it to 1 and meta and ctrl to multiply by 3 if the
 terminal supports them, also support wheel in choose mode. From Marcel
 Partap.

---
 tmux.h          |  1 +
 tty-keys.c      |  9 +++++++++
 window-choose.c | 12 +++++++++++-
 window-copy.c   | 21 +++++++++++----------
 4 files changed, 32 insertions(+), 11 deletions(-)

diff --git a/tmux.h b/tmux.h
index 7e541458..a9edf8ff 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1168,6 +1168,7 @@ struct mouse_event {
 
 	u_int	button;
 	u_int	clicks;
+	u_int	scroll;
 
 	int	wheel;
 	int     event;
diff --git a/tty-keys.c b/tty-keys.c
index 1116df2b..4f55a80c 100644
--- a/tty-keys.c
+++ b/tty-keys.c
@@ -749,6 +749,15 @@ tty_keys_mouse(struct tty *tty, const char *buf, size_t len, size_t *size)
 	m->x = x;
 	m->y = y;
 	if (b & MOUSE_MASK_WHEEL) {
+		if (b & MOUSE_MASK_SHIFT)
+			m->scroll = 1;
+		else
+			m->scroll = 3;
+		if (b & MOUSE_MASK_META)
+			m->scroll *= 3;
+		if (b & MOUSE_MASK_CTRL)
+			m->scroll *= 3;
+
 		b &= MOUSE_MASK_BUTTONS;
 		if (b == 0)
 			m->wheel = MOUSE_WHEEL_UP;
diff --git a/window-choose.c b/window-choose.c
index bb881aa5..c354d46f 100644
--- a/window-choose.c
+++ b/window-choose.c
@@ -721,7 +721,17 @@ window_choose_mouse(
 	struct window_choose_mode_data	*data = wp->modedata;
 	struct screen			*s = &data->screen;
 	struct window_choose_mode_item	*item;
-	u_int				 idx;
+	u_int				 i, idx;
+
+	if (m->event == MOUSE_EVENT_WHEEL) {
+		for (i = 0; i < m->scroll; i++) {
+			if (m->wheel == MOUSE_WHEEL_UP)
+				window_choose_key(wp, sess, KEYC_UP);
+			else
+				window_choose_key(wp, sess, KEYC_DOWN);
+		}
+		return;
+	}
 
 	if (~m->event & MOUSE_EVENT_CLICK)
 		return;
diff --git a/window-copy.c b/window-copy.c
index 7d7f3a20..6e4d6704 100644
--- a/window-copy.c
+++ b/window-copy.c
@@ -871,18 +871,19 @@ window_copy_mouse(
 
 	/* If mouse wheel (buttons 4 and 5), scroll. */
 	if (m->event == MOUSE_EVENT_WHEEL) {
-		if (m->wheel == MOUSE_WHEEL_UP) {
-			for (i = 0; i < 5; i++)
+		for (i = 0; i < m->scroll; i++) {
+			if (m->wheel == MOUSE_WHEEL_UP)
 				window_copy_cursor_up(wp, 1);
-		} else if (m->wheel == MOUSE_WHEEL_DOWN) {
-			for (i = 0; i < 5; i++)
+			else {
 				window_copy_cursor_down(wp, 1);
-			/*
-			 * We reached the bottom, leave copy mode,
-			 * but only if no selection is in progress.
-			 */
-			if (data->oy == 0 && !s->sel.flag)
-			    goto reset_mode;
+
+				/*
+				 * We reached the bottom, leave copy mode, but
+				 * only if no selection is in progress.
+				 */
+				if (data->oy == 0 && !s->sel.flag)
+					goto reset_mode;
+			}
 		}
 		return;
 	}