lv_label.h

Defines

LV_LABEL_DOT_NUM
LV_LABEL_POS_LAST
LV_LABEL_TEXT_SELECTION_OFF
LV_LABEL_DEFAULT_TEXT

Enums

enum lv_label_long_mode_t

Long mode behaviors. Used in 'lv_label_ext_t'

Values:

enumerator LV_LABEL_LONG_WRAP

Keep the object width, wrap lines longer than object width and expand the object height

enumerator LV_LABEL_LONG_DOT

Keep the size and write dots at the end if the text is too long

enumerator LV_LABEL_LONG_SCROLL

Keep the size and roll the text back and forth

enumerator LV_LABEL_LONG_SCROLL_CIRCULAR

Keep the size and roll the text circularly

enumerator LV_LABEL_LONG_CLIP

Keep the size and clip the text out of it

enum [anonymous]

Values:

enumerator LV_PROPERTY_LABEL_TEXT
enumerator LV_PROPERTY_LABEL_LONG_MODE
enumerator LV_PROPERTY_LABEL_TEXT_SELECTION_START
enumerator LV_PROPERTY_LABEL_TEXT_SELECTION_END
enumerator LV_PROPERTY_LABEL_END

Functions

lv_obj_t *lv_label_create(lv_obj_t *parent)

Create a label object

参数:

parent -- pointer to an object, it will be the parent of the new label.

返回:

pointer to the created button

void lv_label_set_text(lv_obj_t *obj, const char *text)

Set a new text for a label. Memory will be allocated to store the text by the label.

参数:

  • obj -- pointer to a label object

  • text -- '\0' terminated character string. NULL to refresh with the current text.

void lv_label_set_text_fmt(lv_obj_t *obj, const char *fmt, ...)

Set a new formatted text for a label. Memory will be allocated to store the text by the label.

Example:

lv_label_set_text_fmt(label1, "%d user", user_num);

参数:

  • obj -- pointer to a label object

  • fmt -- printf-like format

void lv_label_set_text_static(lv_obj_t *obj, const char *text)

Set a static text. It will not be saved by the label so the 'text' variable has to be 'alive' while the label exists.

参数:

  • obj -- pointer to a label object

  • text -- pointer to a text. NULL to refresh with the current text.

void lv_label_set_long_mode(lv_obj_t *obj, lv_label_long_mode_t long_mode)

Set the behavior of the label with text longer than the object size

参数:

  • obj -- pointer to a label object

  • long_mode -- the new mode from 'lv_label_long_mode' enum. In LV_LONG_WRAP/DOT/SCROLL/SCROLL_CIRC the size of the label should be set AFTER this function

void lv_label_set_text_selection_start(lv_obj_t *obj, uint32_t index)

Set where text selection should start

参数:

  • obj -- pointer to a label object

  • index -- character index from where selection should start. LV_LABEL_TEXT_SELECTION_OFF for no selection

void lv_label_set_text_selection_end(lv_obj_t *obj, uint32_t index)

Set where text selection should end

参数:

  • obj -- pointer to a label object

  • index -- character index where selection should end. LV_LABEL_TEXT_SELECTION_OFF for no selection

char *lv_label_get_text(const lv_obj_t *obj)

Get the text of a label

参数:

obj -- pointer to a label object

返回:

the text of the label

lv_label_long_mode_t lv_label_get_long_mode(const lv_obj_t *obj)

Get the long mode of a label

参数:

obj -- pointer to a label object

返回:

the current long mode

void lv_label_get_letter_pos(const lv_obj_t *obj, uint32_t char_id, lv_point_t *pos)

Get the relative x and y coordinates of a letter

参数:

  • obj -- pointer to a label object

  • char_id -- index of the character [0 ... text length - 1]. Expressed in character index, not byte index (different in UTF-8)

  • pos -- store the result here (E.g. index = 0 gives 0;0 coordinates if the text if aligned to the left)

uint32_t lv_label_get_letter_on(const lv_obj_t *obj, lv_point_t *pos_in, bool bidi)

Get the index of letter on a relative point of a label.

参数:

  • obj -- pointer to label object

  • pos_in -- pointer to point with coordinates on a the label

  • bidi -- whether to use bidi processed

返回:

The index of the letter on the 'pos_p' point (E.g. on 0;0 is the 0. letter if aligned to the left) Expressed in character index and not byte index (different in UTF-8)

bool lv_label_is_char_under_pos(const lv_obj_t *obj, lv_point_t *pos)

Check if a character is drawn under a point.

参数:

  • obj -- pointer to a label object

  • pos -- Point to check for character under

返回:

whether a character is drawn under the point

uint32_t lv_label_get_text_selection_start(const lv_obj_t *obj)

Get the selection start index.

参数:

obj -- pointer to a label object.

返回:

selection start index. LV_LABEL_TEXT_SELECTION_OFF if nothing is selected.

uint32_t lv_label_get_text_selection_end(const lv_obj_t *obj)

Get the selection end index.

参数:

obj -- pointer to a label object.

返回:

selection end index. LV_LABEL_TXT_SEL_OFF if nothing is selected.

void lv_label_ins_text(lv_obj_t *obj, uint32_t pos, const char *txt)

Insert a text to a label. The label text cannot be static.

参数:

  • obj -- pointer to a label object

  • pos -- character index to insert. Expressed in character index and not byte index. 0: before first char. LV_LABEL_POS_LAST: after last char.

  • txt -- pointer to the text to insert

void lv_label_cut_text(lv_obj_t *obj, uint32_t pos, uint32_t cnt)

Delete characters from a label. The label text cannot be static.

参数:

  • obj -- pointer to a label object

  • pos -- character index from where to cut. Expressed in character index and not byte index. 0: start in front of the first character

  • cnt -- number of characters to cut

Variables

const lv_obj_class_t lv_label_class