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fix(arc): ignore hits that are outside drawn background arc (#6753)

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This commit is contained in:
Luca Vanesche
2024-09-03 11:55:55 +02:00
committed by Gabor Kiss-Vamosi
parent c11fda693c
commit 3a96eaa08a
5 changed files with 105 additions and 9 deletions
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18
docs/widgets/arc.rst
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@@ -105,13 +105,19 @@ the object non-clickable:
lv_obj_remove_style(arc, NULL, LV_PART_KNOB);
lv_obj_remove_flag(arc, LV_OBJ_FLAG_CLICKABLE);
Advanced hit test
-----------------
Interactive area
----------------
If the :cpp:enumerator:`LV_OBJ_FLAG_ADV_HITTEST` flag is enabled the arc can be
clicked through in the middle. Clicks are recognized only on the ring of
the background arc. :cpp:func:`lv_obj_set_ext_click_size` makes the sensitive
area larger inside and outside with the given number of pixels.
By default :cpp:enumerator:`LV_OBJ_FLAG_ADV_HITTEST` is disabled which
means the arc's whole area is interactive.
As usual :cpp:func:`lv_obj_set_ext_click_size` can be used to increase
the sensitive area outside the arc by a specified number of pixels.
If :cpp:enumerator:`LV_OBJ_FLAG_ADV_HITTEST` is enabled the arc will be sensitive only
in the range of start and end background angles and on the arc itself (not inside the arc).
In this case ``ext_click_size`` makes the sensitive area ticker both inward and outward.
Additionally, a tolerance of :cpp:expr:`lv_dpx(50)` pixels is applied to each angle, extending the
hit-test range along the arc's length.
Place another object to the knob
--------------------------------