Table (lv_table)¶

Overview¶

Tables, as usual, are built from rows, columns, and cells containing texts.

The Table object is very lightweight because only the texts are stored. No real objects are created for cells but they are just drawn on the fly.

Parts and Styles¶

LV_PART_MAIN The background of the table uses all the typical background style properties.
LV_PART_ITEMS The cells of the table also use all the typical background style properties and the text properties.

Usage¶

Set cell value¶

The cells can store only text so numbers need to be converted to text before displaying them in a table.

lv_table_set_cell_value(table, row, col, "Content"). The text is saved by the table so it can be even a local variable.

Line breaks can be used in the text like "Value\n60.3".

New rows and columns are automatically added is required

Rows and Columns¶

To explicitly set number of rows and columns use lv_table_set_row_cnt(table, row_cnt) and lv_table_set_col_cnt(table, col_cnt)

Width and Height¶

The width of the columns can be set with lv_table_set_col_width(table, col_id, width). The overall width of the Table object will be set to the sum of columns widths.

The height is calculated automatically from the cell styles (font, padding etc) and the number of rows.

Merge cells¶

Cells can be merged horizontally with lv_table_set_cell_merge_right(table, col, row, true). To merge more adjacent cells call this function for each cell.

Scroll¶

If the label's width or height is set to LV_SIZE_CONTENT that size will be used to show the whole table in the respective direction. E.g. lv_obj_set_size(table, LV_SIZE_CONTENT, LV_SIZE_CONTENT) automatically sets the table size to show all the columns and rows.

If the width or height is set to a smaller number than the "intrinsic" size then the table becomes scrollable.

Events¶

LV_EVENT_DRAW_PART_BEGIN and LV_EVENT_DRAW_PART_END are sent for both main and items parts to allow hooking the drawing. For more detail on the main part see the Base object's documentation. For the items (cells) the following fields are used: clip_area, draw_area, part, rect_dsc, label_dsc id (current row × col count + current column).

Learn more about Events.

Keys¶

No Keys are processed by the object type.

Learn more about Keys.

Example¶

C¶

Simple table¶

#include "../../lv_examples.h"
#if LV_USE_TABLE && LV_BUILD_EXAMPLES

static void draw_part_event_cb(lv_event_t * e)
{
    lv_obj_t * obj = lv_event_get_target(e);
    lv_obj_draw_part_dsc_t * dsc = lv_event_get_param(e);
    /*If the cells are drawn...*/
    if(dsc->part == LV_PART_ITEMS) {
        uint32_t row = dsc->id /  lv_table_get_col_cnt(obj);
        uint32_t col = dsc->id - row * lv_table_get_col_cnt(obj);

        /*Make the texts in the first cell center aligned*/
        if(row == 0) {
            dsc->label_dsc->align = LV_TEXT_ALIGN_CENTER;
            dsc->rect_dsc->bg_color = lv_color_mix(lv_palette_main(LV_PALETTE_BLUE), dsc->rect_dsc->bg_color, LV_OPA_20);
            dsc->rect_dsc->bg_opa = LV_OPA_COVER;
        }
        /*In the first column align the texts to the right*/
        else if(col == 0) {
            dsc->label_dsc->flag = LV_TEXT_ALIGN_RIGHT;
        }

        /*MAke every 2nd row grayish*/
        if((row != 0 && row % 2) == 0) {
            dsc->rect_dsc->bg_color = lv_color_mix(lv_palette_main(LV_PALETTE_GREY), dsc->rect_dsc->bg_color, LV_OPA_10);
            dsc->rect_dsc->bg_opa = LV_OPA_COVER;
        }
    }
}


void lv_example_table_1(void)
{
    lv_obj_t * table = lv_table_create(lv_scr_act());

    /*Fill the first column*/
    lv_table_set_cell_value(table, 0, 0, "Name");
    lv_table_set_cell_value(table, 1, 0, "Apple");
    lv_table_set_cell_value(table, 2, 0, "Banana");
    lv_table_set_cell_value(table, 3, 0, "Lemon");
    lv_table_set_cell_value(table, 4, 0, "Grape");
    lv_table_set_cell_value(table, 5, 0, "Melon");
    lv_table_set_cell_value(table, 6, 0, "Peach");
    lv_table_set_cell_value(table, 7, 0, "Nuts");

    /*Fill the second column*/
    lv_table_set_cell_value(table, 0, 1, "Price");
    lv_table_set_cell_value(table, 1, 1, "$7");
    lv_table_set_cell_value(table, 2, 1, "$4");
    lv_table_set_cell_value(table, 3, 1, "$6");
    lv_table_set_cell_value(table, 4, 1, "$2");
    lv_table_set_cell_value(table, 5, 1, "$5");
    lv_table_set_cell_value(table, 6, 1, "$1");
    lv_table_set_cell_value(table, 7, 1, "$9");

    /*Set a smaller height to the table. It'll make it scrollable*/
    lv_obj_set_height(table, 200);
    lv_obj_center(table);

    /*Add an event callback to to apply some custom drawing*/
    lv_obj_add_event_cb(table, draw_part_event_cb, LV_EVENT_DRAW_PART_BEGIN, NULL);
}

#endif

Lightweighted list from table¶

#include "../../lv_examples.h"
#if LV_USE_TABLE && LV_BUILD_EXAMPLES

#define ITEM_CNT 200

static void draw_event_cb(lv_event_t * e)
{
    lv_obj_t * obj = lv_event_get_target(e);
    lv_obj_draw_part_dsc_t * dsc = lv_event_get_draw_part_dsc(e);
    /*If the cells are drawn...*/
    if(dsc->part == LV_PART_ITEMS) {
        bool chk = lv_table_has_cell_ctrl(obj, dsc->id, 0, LV_TABLE_CELL_CTRL_CUSTOM_1);

        lv_draw_rect_dsc_t rect_dsc;
        lv_draw_rect_dsc_init(&rect_dsc);
        rect_dsc.bg_color = chk ? lv_theme_get_color_primary(obj) : lv_palette_lighten(LV_PALETTE_GREY, 2);
        rect_dsc.radius = LV_RADIUS_CIRCLE;

        lv_area_t sw_area;
        sw_area.x1 = dsc->draw_area->x2 - 50;
        sw_area.x2 = sw_area.x1 + 40;
        sw_area.y1 =  dsc->draw_area->y1 + lv_area_get_height(dsc->draw_area) / 2 - 10;
        sw_area.y2 = sw_area.y1 + 20;
        lv_draw_rect(&sw_area, dsc->clip_area, &rect_dsc);

        rect_dsc.bg_color = lv_color_white();
        if(chk) {
            sw_area.x2 -= 2;
            sw_area.x1 = sw_area.x2 - 16;
        } else {
            sw_area.x1 += 2;
            sw_area.x2 = sw_area.x1 + 16;
        }
        sw_area.y1 += 2;
        sw_area.y2 -= 2;
        lv_draw_rect(&sw_area, dsc->clip_area, &rect_dsc);
    }
}

static void change_event_cb(lv_event_t * e)
{
    lv_obj_t * obj = lv_event_get_target(e);
    uint16_t col;
    uint16_t row;
    lv_table_get_selected_cell(obj, &row, &col);
    bool chk = lv_table_has_cell_ctrl(obj, row, 0, LV_TABLE_CELL_CTRL_CUSTOM_1);
    if(chk) lv_table_clear_cell_ctrl(obj, row, 0, LV_TABLE_CELL_CTRL_CUSTOM_1);
    else lv_table_add_cell_ctrl(obj, row, 0, LV_TABLE_CELL_CTRL_CUSTOM_1);
}


/**
 * A very light-weighted list created from table
 */
void lv_example_table_2(void)
{
    /*Measure memory usage*/
    lv_mem_monitor_t mon1;
    lv_mem_monitor(&mon1);

    uint32_t t = lv_tick_get();

    lv_obj_t * table = lv_table_create(lv_scr_act());

    /*Set a smaller height to the table. It'll make it scrollable*/
    lv_obj_set_size(table, LV_SIZE_CONTENT, 200);

    lv_table_set_col_width(table, 0, 150);
    lv_table_set_row_cnt(table, ITEM_CNT); /*Not required but avoids a lot of memory reallocation lv_table_set_set_value*/
    lv_table_set_col_cnt(table, 1);

    /*Don't make the cell pressed, we will draw something different in the event*/
    lv_obj_remove_style(table, NULL, LV_PART_ITEMS | LV_STATE_PRESSED);

    uint32_t i;
    for(i = 0; i < ITEM_CNT; i++) {
        lv_table_set_cell_value_fmt(table, i, 0, "Item %d", i + 1);
    }

    lv_obj_align(table, LV_ALIGN_CENTER, 0, -20);

    /*Add an event callback to to apply some custom drawing*/
    lv_obj_add_event_cb(table, draw_event_cb, LV_EVENT_DRAW_PART_END, NULL);
    lv_obj_add_event_cb(table, change_event_cb, LV_EVENT_VALUE_CHANGED, NULL);

    lv_mem_monitor_t mon2;
    lv_mem_monitor(&mon2);

    uint32_t mem_used = mon1.free_size - mon2.free_size;

    uint32_t elaps = lv_tick_elaps(t);

    lv_obj_t * label = lv_label_create(lv_scr_act());
    lv_label_set_text_fmt(label, "%d items were created in %d ms\n"
                                  "using %d bytes of memory",
                                  ITEM_CNT, elaps, mem_used);

    lv_obj_align(label, LV_ALIGN_BOTTOM_MID, 0, -10);

}

#endif

MicroPython¶

No examples yet.

MicroPython¶

No examples yet.

API¶

Typedefs

typedef uint8_t lv_table_cell_ctrl_t¶

Enums

enum [anonymous]¶

Values:

enumerator LV_TABLE_CELL_CTRL_MERGE_RIGHT¶

enumerator LV_TABLE_CELL_CTRL_TEXT_CROP¶

enumerator LV_TABLE_CELL_CTRL_CUSTOM_1¶

enumerator LV_TABLE_CELL_CTRL_CUSTOM_2¶

enumerator LV_TABLE_CELL_CTRL_CUSTOM_3¶

enumerator LV_TABLE_CELL_CTRL_CUSTOM_4¶

Functions

LV_EXPORT_CONST_INT(LV_TABLE_CELL_NONE)¶

lv_obj_t *lv_table_create(lv_obj_t *parent)¶

Create a table object

Parameters: parent -- pointer to an object, it will be the parent of the new table
Returns: pointer to the created table

void lv_table_set_cell_value(lv_obj_t *obj, uint16_t row, uint16_t col, const char *txt)¶

Set the value of a cell.

Note

New roes/columns are added automatically if required

Parameters

obj -- pointer to a Table object
row -- id of the row [0 .. row_cnt -1]
col -- id of the column [0 .. col_cnt -1]
txt -- text to display in the cell. It will be copied and saved so this variable is not required after this function call.

void lv_table_set_cell_value_fmt(lv_obj_t *obj, uint16_t row, uint16_t col, const char *fmt, ...)¶

Set the value of a cell. Memory will be allocated to store the text by the table.

Note

New roes/columns are added automatically if required

Parameters

obj -- pointer to a Table object
row -- id of the row [0 .. row_cnt -1]
col -- id of the column [0 .. col_cnt -1]
fmt -- printf-like format

void lv_table_set_row_cnt(lv_obj_t *obj, uint16_t row_cnt)¶

Set the number of rows

Parameters

obj -- table pointer to a Table object
row_cnt -- number of rows

void lv_table_set_col_cnt(lv_obj_t *obj, uint16_t col_cnt)¶

Set the number of columns

Parameters

obj -- table pointer to a Table object
col_cnt -- number of columns.

void lv_table_set_col_width(lv_obj_t *obj, uint16_t col_id, lv_coord_t w)¶

Set the width of a column

Parameters

obj -- table pointer to a Table object
col_id -- id of the column [0 .. LV_TABLE_COL_MAX -1]
w -- width of the column

void lv_table_add_cell_ctrl(lv_obj_t *obj, uint16_t row, uint16_t col, lv_table_cell_ctrl_t ctrl)¶

Add control bits to the cell.

Parameters

obj -- pointer to a Table object
row -- id of the row [0 .. row_cnt -1]
col -- id of the column [0 .. col_cnt -1]
ctrl -- OR-ed values from ::lv_table_cell_ctrl_t

void lv_table_clear_cell_ctrl(lv_obj_t *obj, uint16_t row, uint16_t col, lv_table_cell_ctrl_t ctrl)¶

Clear control bits of the cell.

Parameters

obj -- pointer to a Table object
row -- id of the row [0 .. row_cnt -1]
col -- id of the column [0 .. col_cnt -1]
ctrl -- OR-ed values from ::lv_table_cell_ctrl_t

const char *lv_table_get_cell_value(lv_obj_t *obj, uint16_t row, uint16_t col)¶

Get the value of a cell.

Parameters

obj -- pointer to a Table object
row -- id of the row [0 .. row_cnt -1]
col -- id of the column [0 .. col_cnt -1]

Returns

text in the cell

uint16_t lv_table_get_row_cnt(lv_obj_t *obj)¶

Get the number of rows.

Parameters: obj -- table pointer to a Table object
Returns: number of rows.

uint16_t lv_table_get_col_cnt(lv_obj_t *obj)¶

Get the number of columns.

Parameters: obj -- table pointer to a Table object
Returns: number of columns.

lv_coord_t lv_table_get_col_width(lv_obj_t *obj, uint16_t col)¶

Get the width of a column

Parameters

obj -- table pointer to a Table object
col -- id of the column [0 .. LV_TABLE_COL_MAX -1]

Returns

width of the column

bool lv_table_has_cell_ctrl(lv_obj_t *obj, uint16_t row, uint16_t col, lv_table_cell_ctrl_t ctrl)¶

Get whether a cell has the control bits

Parameters

obj -- pointer to a Table object
row -- id of the row [0 .. row_cnt -1]
col -- id of the column [0 .. col_cnt -1]
ctrl -- OR-ed values from ::lv_table_cell_ctrl_t

Returns

true: all control bits are set; false: not all control bits are set

void lv_table_get_selected_cell(lv_obj_t *obj, uint16_t *row, uint16_t *col)¶

Get the selected cell (pressed and or focused)

Parameters

obj -- pointer to a table object
row -- pointer to variable to store the selected row (LV_TABLE_CELL_NONE: if no cell selected)
col -- pointer to variable to store the selected column (LV_TABLE_CELL_NONE: if no cell selected)

Variables

const lv_obj_class_t lv_table_class¶

struct lv_table_t¶

Public Members

lv_obj_t obj¶

uint16_t col_cnt¶

uint16_t row_cnt¶

char **cell_data¶

lv_coord_t *row_h¶

lv_coord_t *col_w¶

uint16_t col_act¶

uint16_t row_act¶