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96 lines
2.5 KiB
ReStructuredText
96 lines
2.5 KiB
ReStructuredText
.. _lv_checkbox:
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======================
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Checkbox (lv_checkbox)
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======================
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Overview
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********
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The Checkbox object is created from a "tick box" and a label. When the
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Checkbox is clicked the tick box is toggled.
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.. _lv_checkbox_parts_and_styles:
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Parts and Styles
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****************
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- :cpp:enumerator:`LV_PART_MAIN` The is the background of the Checkbox and it uses
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the text and all the typical background style properties.
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``pad_column`` adjusts the spacing between the tickbox and the label
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- :cpp:enumerator:`LV_PART_INDICATOR` The "tick box" is a square that uses all the
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typical background style properties. By default, its size is equal to
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the height of the main part's font. Padding properties make the tick
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box larger in the respective directions.
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The Checkbox is added to the default group (if it is set).
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.. _lv_checkbox_usage:
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Usage
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*****
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Text
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----
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The text can be modified with the
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:cpp:expr:`lv_checkbox_set_text(cb, "New text")` function and will be
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dynamically allocated.
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To set a static text, use :cpp:expr:`lv_checkbox_set_static_text(cb, txt)`. This
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way, only a pointer to ``txt`` will be stored. The text then shouldn't
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be deallocated while the checkbox exists.
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Check, uncheck, disable
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-----------------------
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You can manually check, un-check, and disable the Checkbox by using the
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common state add/clear function:
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.. code:: c
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lv_obj_add_state(cb, LV_STATE_CHECKED); /*Make the checkbox checked*/
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lv_obj_remove_state(cb, LV_STATE_CHECKED); /*Make the checkbox unchecked*/
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lv_obj_add_state(cb, LV_STATE_CHECKED | LV_STATE_DISABLED); /*Make the checkbox checked and disabled*/
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To get whether the checkbox is checked or not use:
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:cpp:expr:`lv_obj_has_state(cb, LV_STATE_CHECKED)`.
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.. _lv_checkbox_events:
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Events
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******
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- :cpp:enumerator:`LV_EVENT_VALUE_CHANGED` Sent when the checkbox is toggled.
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See the events of the :ref:`Base object <lv_obj>` too.
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Learn more about :ref:`events`.
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.. _lv_checkbox_keys:
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Keys
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****
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The following *Keys* are processed by the 'Buttons': -
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``LV_KEY_RIGHT/UP`` Go to toggled state if toggling is enabled -
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``LV_KEY_LEFT/DOWN`` Go to non-toggled state if toggling is enabled -
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:cpp:enumerator:`LV_KEY_ENTER` Clicks the checkbox and toggles it
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Note that, as usual, the state of :cpp:enumerator:`LV_KEY_ENTER` is translated to
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``LV_EVENT_PRESSED/PRESSING/RELEASED`` etc.
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Learn more about :ref:`indev_keys`.
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.. _lv_checkbox_example:
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Example
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*******
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.. include:: ../examples/widgets/checkbox/index.rst
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.. _lv_checkboxapi:
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API
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***
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