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67 lines
1.9 KiB
Markdown
67 lines
1.9 KiB
Markdown
2 years ago
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# Image button (lv_imgbtn)
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## Overview
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The Image button is very similar to the simple 'Button' object. The only difference is that it displays user-defined images in each state instead of drawing a rectangle.
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You can set a left, right and center image, and the center image will be repeated to match the width of the object.
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## Parts and Styles
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- `LV_PART_MAIN` Refers to the image(s). If background style properties are used, a rectangle will be drawn behind the image button.
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## Usage
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### Image sources
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To set the image in a state, use the `lv_imgbtn_set_src(imgbtn, LV_IMGBTN_STATE_..., src_left, src_center, src_right)`.
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The image sources work the same as described in the [Image object](/widgets/core/img) except that "Symbols" are not supported by the Image button.
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Any of the sources can `NULL`.
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The possible states are:
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- `LV_IMGBTN_STATE_RELEASED`
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- `LV_IMGBTN_STATE_PRESSED`
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- `LV_IMGBTN_STATE_DISABLED`
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- `LV_IMGBTN_STATE_CHECKED_RELEASED`
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- `LV_IMGBTN_STATE_CHECKED_PRESSED`
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- `LV_IMGBTN_STATE_CHECKED_DISABLED`
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If you set sources only in `LV_IMGBTN_STATE_RELEASED`, these sources will be used in other states too.
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If you set e.g. `LV_IMGBTN_STATE_PRESSED` they will be used in pressed state instead of the released images.
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### States
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Instead of the regular `lv_obj_add/clear_state()` functions the `lv_imgbtn_set_state(imgbtn, LV_IMGBTN_STATE_...)` functions should be used to manually set a state.
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## Events
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- `LV_EVENT_VALUE_CHANGED` Sent when the button is toggled.
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Learn more about [Events](/overview/event).
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## Keys
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- `LV_KEY_RIGHT/UP` Go to toggled state if `LV_OBJ_FLAG_CHECKABLE` is enabled.
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- `LV_KEY_LEFT/DOWN` Go to non-toggled state if `LV_OBJ_FLAG_CHECKABLE` is enabled.
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- `LV_KEY_ENTER` Clicks the button
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Learn more about [Keys](/overview/indev).
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## Example
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```eval_rst
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.. include:: ../../../examples/widgets/imgbtn/index.rst
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```
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## API
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```eval_rst
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.. doxygenfile:: lv_imgbtn.h
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:project: lvgl
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```
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