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63 lines
2.1 KiB
Markdown
63 lines
2.1 KiB
Markdown
2 years ago
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# Bar (lv_bar)
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## Overview
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The bar object has a background and an indicator on it. The width of the indicator is set according to the current value of the bar.
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Vertical bars can be created if the width of the object is smaller than its height.
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Not only the end, but also the start value of the bar can be set, which changes the start position of the indicator.
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## Parts and Styles
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- `LV_PART_MAIN` The background of the bar and it uses the typical background style properties. Adding padding makes the indicator smaller or larger. The `anim_time` style property sets the animation time if the values set with `LV_ANIM_ON`.
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- `LV_PART_INDICATOR` The indicator itself; also uses all the typical background properties.
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## Usage
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### Value and range
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A new value can be set by `lv_bar_set_value(bar, new_value, LV_ANIM_ON/OFF)`.
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The value is interpreted in a range (minimum and maximum values) which can be modified with `lv_bar_set_range(bar, min, max)`.
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The default range is 0..100.
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The new value in `lv_bar_set_value` can be set with or without an animation depending on the last parameter (`LV_ANIM_ON/OFF`).
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### Modes
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The bar can be one of the following modes:
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- `LV_BAR_MODE_NORMAL` A normal bar as described above
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- `LV_BAR_MODE_SYMMETRICAL` Draw the indicator from the zero value to current value. Requires a negative minimum range and positive maximum range.
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- `LV_BAR_MODE_RANGE` Allows setting the start value too by `lv_bar_set_start_value(bar, new_value, LV_ANIM_ON/OFF)`. The start value always has to be smaller than the end value.
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## Events
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- `LV_EVENT_DRAW_PART_BEGIN` and `LV_EVENT_DRAW_PART_END` are sent for the following parts:
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- `LV_BAR_DRAW_PART_INDICATOR` The indicator of the bar
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- `part`: `LV_PART_INDICATOR`
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- `draw_area`: area of the indicator
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- `rect_dsc`
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See the events of the [Base object](/widgets/obj) too.
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Learn more about [Events](/overview/event).
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## Keys
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No *Keys* are processed by the object type.
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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/bar/index.rst
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```
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## API
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```eval_rst
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.. doxygenfile:: lv_bar.h
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:project: lvgl
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```
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