add scroll button option

This commit introduces a scroll_button option, which is intended to be
used with scroll_method. Now user can edit his sway config and add an
scroll_button option to device section.

1 files changed, 4 insertions, 0 deletions

diff --git a/sway/config/input.c b/sway/config/input.c
index 9840df18..62d77cf7 100644
--- a/sway/config/input.c
+++ b/sway/config/input.c
@@ -28,6 +28,7 @@ struct input_config *new_input_config(const char* identifier) {
         input->accel_profile = INT_MIN;
         input->pointer_accel = FLT_MIN;
         input->scroll_method = INT_MIN;
+        input->scroll_button = INT_MIN;
         input->left_handed = INT_MIN;
         input->repeat_delay = INT_MIN;
         input->repeat_rate = INT_MIN;
@@ -70,6 +71,9 @@ void merge_input_config(struct input_config *dst, struct input_config *src) {
         if (src->scroll_method != INT_MIN) {
                 dst->scroll_method = src->scroll_method;
         }
+        if (src->scroll_button != INT_MIN) {
+                dst->scroll_button= src->scroll_button;
+        }
         if (src->send_events != INT_MIN) {
                 dst->send_events = src->send_events;
         }