mirror of https://github.com/lvgl/lvgl.git synced 2025-01-14 06:42:58 +08:00

Gabor Kiss-Vamosi 88c485949f feat(event, widgets) improve the paramter of LV_EVENT_DRAW_PART_BEGIN/END

Add lv_<widget>_draw_part_type_t to widgets to precisly describe the hooked drawings.
Also add class_p element to lv_obj_draw_part_dsc_t to show what widgets lv_<widget>_draw_part_type_t needs to be used.

Related to: https://forum.lvgl.io/t/how-to-add-minor-division-lines-to-a-chart/5366/

2021-07-07 16:19:06 +02:00

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.. include:: /header.rst 
:github_url: |github_link_base|/widgets/btn.md

Button (lv_btn)

Overview

Buttons have no new features compared to the Base object. They are usuful for semantic purposes and have slightly different default settings.

Buttons, by default, differ from Base object in the following ways:

Not scrollable
Added to the default group
Default height and width set to LV_SIZE_CONTENT

Parts and Styles

LV_PART_MAIN The background of the button. Uses the typical background style properties.

Usage

There are no new features compared to Base object.

Events

LV_EVENT_VALUE_CHANGED when the LV_OBJ_FLAG_CHECKABLE flag is enabled and the object is clicked. The event happens on transition to/from the checked state.

Learn more about Events.

Keys

Note that the state of LV_KEY_ENTER is translated to LV_EVENT_PRESSED/PRESSING/RELEASED etc.

See the events of the Base object too.

Learn more about Keys.

Example


.. include:: ../../../examples/widgets/btn/index.rst

API


.. doxygenfile:: lv_btn.h
  :project: lvgl

1.2 KiB Raw Blame History