lv_obj_property.h

Defines

LV_PROPERTY_TYPE_INVALID

LV_PROPERTY_TYPE_INT

LV_PROPERTY_TYPE_PRECISE

LV_PROPERTY_TYPE_COLOR

LV_PROPERTY_TYPE_POINT

LV_PROPERTY_TYPE_POINTER

LV_PROPERTY_TYPE_IMGSRC

LV_PROPERTY_TYPE_TEXT

LV_PROPERTY_TYPE_OBJ

LV_PROPERTY_TYPE_DISPLAY

LV_PROPERTY_TYPE_FONT

LV_PROPERTY_TYPE_SHIFT

LV_PROPERTY_ID(clz, name, type, index)

LV_PROPERTY_ID_TYPE(id)

LV_PROPERTY_ID_INDEX(id)

LV_OBJ_SET_PROPERTY_ARRAY(obj, array)

Enums

enum [anonymous]

Group of predefined widget ID start value.

Values:

enumerator LV_PROPERTY_ID_INVALID

enumerator LV_PROPERTY_STYLE_START

enumerator LV_PROPERTY_ID_START

enumerator LV_PROPERTY_OBJ_START

enumerator LV_PROPERTY_IMAGE_START

enumerator LV_PROPERTY_ID_BUILTIN_LAST

enumerator LV_PROPERTY_ID_ANY

Functions

lv_result_t lv_obj_set_property(lv_obj_t *obj, const lv_property_t *value)

Set widget property.

Parameters:

obj -- pointer to an object
value -- The property value to set

Returns:

return LV_RESULT_OK if success

lv_result_t lv_obj_set_properties(lv_obj_t *obj, const lv_property_t *value, uint32_t count)

Set multiple widget properties. Helper LV_OBJ_SET_PROPERTY_ARRAY can be used for constant property array.

Parameters:

obj -- pointer to an object
value -- The property value array to set
count -- The count of the property value array

Returns:

return LV_RESULT_OK if success

lv_property_t lv_obj_get_property(lv_obj_t *obj, lv_prop_id_t id)

Read property value from object. If id is a style property, the style selector is default to 0.

Parameters:

obj -- pointer to an object
id -- ID of which property to read
value -- pointer to a buffer to store the value

Returns:

return the property value read. The returned property ID is set to LV_PROPERTY_ID_INVALID if failed.

lv_property_t lv_obj_get_style_property(lv_obj_t *obj, lv_prop_id_t id, uint32_t selector)

Read a style property value from object

Parameters:

obj -- pointer to an object
id -- ID of style property
selector -- selector for the style property.

Returns:

return the property value read. The returned property ID is set to LV_PROPERTY_ID_INVALID if failed.

lv_prop_id_t lv_obj_property_get_id(const lv_obj_t *obj, const char *name)

Get the property ID by name. Requires to enable LV_USE_OBJ_PROPERTY_NAME.

Parameters:

obj -- pointer to an object that has specified property or base class has.
name -- property name

Returns:

property ID found or LV_PROPERTY_ID_INVALID if not found.

struct _lv_property_name_t

Public Members

const char *name

lv_prop_id_t id

struct lv_property_t

Public Members

lv_prop_id_t id

int32_t num: Number integer number (opacity, enums, booleans or "normal" numbers)

const void *ptr: Constant pointers (font, cone text, etc)

lv_color_t color: Colors

lv_value_precise_t precise: float or int for precise value

lv_point_t point: Point

lv_style_value_t style

Note that place struct member style at first place is intended. style shares same memory with num, ptr, color. So we set the style value directly without using prop.style.num.

E.g.

static const lv_property_t obj_pos_x = { .id = LV_STYLE_X, .num = 123, .selector = LV_STATE_PRESSED, }

instead of: static const lv_property_t obj_pos_x = { .id = LV_STYLE_X, .style.num = 123, // note this line. .selector = LV_STATE_PRESSED, } Make sure it's the first element in struct.

uint32_t selector: Style selector, lv_part_t | lv_state_t

union lv_property_t::[anonymous] [anonymous]

struct lv_property_ops_t

Public Members

lv_prop_id_t id

void *setter: Callback used to set property.

void *getter: Callback used to get property.