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78 lines
2.2 KiB
ReStructuredText
78 lines
2.2 KiB
ReStructuredText
Image button (lv_imagebutton)
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========================
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Overview
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********
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The Image button is very similar to the simple 'Button' object. The only
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difference is that it displays user-defined images in each state instead
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of drawing a rectangle.
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You can set a left, right and center image, and the center image will be
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repeated to match the width of the object.
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Parts and Styles
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****************
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- :cpp:enumerator:`LV_PART_MAIN` Refers to the image(s). If background style
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properties are used, a rectangle will be drawn behind the image
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button.
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Usage
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*****
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Image sources
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-------------
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To set the image in a state, use the
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:cpp:expr:`lv_imagebutton_set_src(imagebutton, LV_IMAGEBUTTON_STATE_..., src_left, src_center, src_right)`.
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The image sources work the same as described in the `Image object </widgets/img>`__
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except that "Symbols" are not supported by the Image button. Any of the sources can ``NULL``.
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The possible states are:
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- :cpp:enumerator:`LV_IMAGEBUTTON_STATE_RELEASED`
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- :cpp:enumerator:`LV_IMAGEBUTTON_STATE_PRESSED`
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- :cpp:enumerator:`LV_IMAGEBUTTON_STATE_DISABLED`
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- :cpp:enumerator:`LV_IMAGEBUTTON_STATE_CHECKED_RELEASED`
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- :cpp:enumerator:`LV_IMAGEBUTTON_STATE_CHECKED_PRESSED`
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- :cpp:enumerator:`LV_IMAGEBUTTON_STATE_CHECKED_DISABLED`
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If you set sources only in :cpp:enumerator:`LV_IMAGEBUTTON_STATE_RELEASED`, these sources
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will be used in other states too. If you set e.g. :cpp:enumerator:`LV_IMAGEBUTTON_STATE_PRESSED`
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they will be used in pressed state instead of the released images.
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States
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------
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Instead of the regular ``lv_obj_add/remove_state()`` functions the
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:cpp:expr:`lv_imagebutton_set_state(imagebutton, LV_IMAGEBUTTON_STATE_...)` functions should be
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used to manually set a state.
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Events
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******
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- :cpp:enumerator:`LV_EVENT_VALUE_CHANGED` Sent when the button is toggled.
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Learn more about :ref:`events`.
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Keys
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****
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- ``LV_KEY_RIGHT/UP`` Go to toggled state if :cpp:enumerator:`LV_OBJ_FLAG_CHECKABLE`
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is enabled.
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- ``LV_KEY_LEFT/DOWN`` Go to non-toggled state if
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:cpp:enumerator:`LV_OBJ_FLAG_CHECKABLE` is enabled.
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- :cpp:enumerator:`LV_KEY_ENTER` Clicks the button
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Learn more about :ref:`indev_keys`.
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Example
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*******
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.. include:: ../examples/widgets/imgagebutton/index.rst
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API
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***
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