efl_ui/scroll_manager: make scroll direction changes more responsive with wheel

Summary:
if the wheel event being processed is in a different direction than the
existing scroll animation, drop the previous animation and immediately
begin scrolling in the opposite direciton

fix T8052

Reviewers: segfaultxavi

Reviewed By: segfaultxavi

Subscribers: segfaultxavi, cedric, #reviewers, #committers

Tags: #efl

Maniphest Tasks: T8052

Differential Revision: https://phab.enlightenment.org/D9806

1 files changed, 10 insertions, 2 deletions

diff --git a/src/lib/elementary/efl_ui_scroll_manager.c b/src/lib/elementary/efl_ui_scroll_manager.c
index bc6ca2412a..7bf0a1dd1a 100644
--- a/src/lib/elementary/efl_ui_scroll_manager.c
+++ b/src/lib/elementary/efl_ui_scroll_manager.c
@@ -791,8 +791,16 @@ _scroll_wheel_post_event_cb(void *data, Evas *e EINA_UNUSED)
    cur = efl_ui_pan_position_get(sd->pan_obj);
    x = cur.x;
    y = cur.y;
-   if (sd->scrollto.x.animator) x = sd->scrollto.x.end;
-   if (sd->scrollto.y.animator) y = sd->scrollto.y.end;
+   if (sd->scrollto.x.animator)
+     {
+        if (((ev->z > 0) && (sd->scrollto.x.end > x)) || ((ev->z < 0) && (sd->scrollto.x.end < x)))
+          x = sd->scrollto.x.end;
+     }
+   if (sd->scrollto.y.animator)
+     {
+        if (((ev->z > 0) && (sd->scrollto.y.end > y)) || ((ev->z < 0) && (sd->scrollto.y.end < y)))
+          y = sd->scrollto.y.end;
+     }
    max = efl_ui_pan_position_max_get(sd->pan_obj);
    min = efl_ui_pan_position_min_get(sd->pan_obj);
    if (x < min.x) x = min.x;