lv_draw_label.h
Defines
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LV_DRAW_LABEL_NO_TXT_SEL
Typedefs
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typedef struct _lv_draw_label_hint_t lv_draw_label_hint_t
Store some info to speed up drawing of very large texts It takes a lot of time to get the first visible character because all the previous characters needs to be checked to calculate the positions. This structure stores an earlier (e.g. at -1000 px) coordinate and the index of that line. Therefore the calculations can start from here.
Functions
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void lv_draw_label_dsc_init(lv_draw_label_dsc_t *dsc)
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void lv_draw_label(struct _lv_draw_ctx_t *draw_ctx, const lv_draw_label_dsc_t *dsc, const lv_area_t *coords, const char *txt, lv_draw_label_hint_t *hint)
Write a text
- Parameters:
draw_ctx -- pointer to the current draw context
dsc -- pointer to draw descriptor
coords -- coordinates of the label
txt --
\0
terminated text to writehint -- pointer to a
lv_draw_label_hint_t
variable. It is managed by the draw to speed up the drawing of very long texts (thousands of lines).
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void lv_draw_letter(struct _lv_draw_ctx_t *draw_ctx, const lv_draw_label_dsc_t *dsc, const lv_point_t *pos_p, uint32_t letter)
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struct lv_draw_label_dsc_t
Public Members
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uint32_t sel_start
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uint32_t sel_end
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lv_color_t color
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lv_color_t sel_color
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lv_color_t sel_bg_color
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lv_coord_t line_space
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lv_coord_t letter_space
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lv_coord_t ofs_x
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lv_coord_t ofs_y
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lv_base_dir_t bidi_dir
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lv_text_align_t align
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lv_text_flag_t flag
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lv_text_decor_t decor
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lv_blend_mode_t blend_mode
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uint32_t sel_start
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struct _lv_draw_label_hint_t
- #include <lv_draw_label.h>
Store some info to speed up drawing of very large texts It takes a lot of time to get the first visible character because all the previous characters needs to be checked to calculate the positions. This structure stores an earlier (e.g. at -1000 px) coordinate and the index of that line. Therefore the calculations can start from here.
Public Members
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int32_t line_start
Index of the line at
y
coordinate
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int32_t y
Give the
y
coordinate of the first letter atline start
index. Relative to the label's coordinates
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int32_t coord_y
The 'y1' coordinate of the label when the hint was saved. Used to invalidate the hint if the label has moved too much.
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int32_t line_start