Table（表） (lv_table)

Overview

查看原文

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.

表格是由包含文本的行、列和单元格构建的。表格对象非常轻量级，因为仅存储文本。没有为细胞创建真实的对象，但它们只是即时绘制的。

Parts and Styles（部分和样式）

查看原文

• 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.

• LV_PART_MAIN 表格的背景使用了所有典型的背景样式属性。

• LV_PART_ITEMS 表格的单元格也使用所有典型的背景样式属性和文本属性。

Usage（用法）

Set cell value（设置单元格的值）

查看原文

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

单元格只能存储文本，因此在将数字显示在表格中之前，需要将其转换为文本。

lv_table_set_cell_value(table, row, col, "Content")。 文本由表保存，因此它甚至可以是局部变量。

可以在文本中使用换行符，例如 "Value\n60.3"。

需要自动添加新的行和列

Rows and Columns（行和列）

查看原文

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)

要明确设置行数和列数，请使用 lv_table_set_row_cnt(table, row_cnt) 和 lv_table_set_col_cnt(table, col_cnt)

Width and Height（宽度和高度）

查看原文

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.

列的宽度可以通过 lv_table_set_col_width(table, col_id, width) 设置。 Table 对象的总宽度将设置为列宽的总和。

高度是根据单元格样式（字体、填充等）和行数自动计算的。

Merge cells（合并单元格）

查看原文

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.

单元格可以使用 lv_table_set_cell_merge_right(table, col, row, true) 进行水平合并。 要合并更多相邻单元格，请为每个单元格调用此函数。

Scroll（滚动）

查看原文

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.

如果标签的宽度或高度设置为“LV_SIZE_CONTENT”，则该尺寸将用于在相应方向上显示整个表格。 例如。 lv_obj_set_size(table, LV_SIZE_CONTENT, LV_SIZE_CONTENT) 自动设置表格大小以显示所有列和行。

如果宽度或高度设置为小于“固有”大小的数字，则表格变为可滚动的。

Events（事件）

查看原文

• LV_EVENT_DRAW_PART_BEGIN and LV_EVENT_DRAW_PART_END are sent for the following types:

  • LV_TABLE_DRAW_PART_CELL The individual cells of the table

    • part: LV_PART_ITEMS

    • draw_area: area of the indicator

    • rect_dsc

    • label_dsc

    • id: current row × col count + current column

See the events of the Base object too.

Learn more about Events.

• 为以下类型发送LV_EVENT_DRAW_PART_BEGIN和LV_EVENT_DRAW_PART_END：

  • LV_TABLE_DRAW_PART_CELL 表格的各个单元格

    • 部分：LV_PART_ITEMS

    • draw_area：指标的区域 -rect_dsc

    • label_dsc

    • id：当前行 × 列数 + 当前列

参见 Base object 的事件。

详细了解 事件。

Keys（按键）

查看原文

No Keys are processed by the object type.

Learn more about Keys.

对象类型不处理 Keys。

了解有关 键 的更多信息。

Example

Simple table

C code  

 GitHub

#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->align = 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

MicroPython code  

 GitHub Simulator

def draw_part_event_cb(e):
    obj = e.get_target()
    dsc = lv.obj_draw_part_dsc_t.__cast__(e.get_param())
    # If the cells are drawn../
    if dsc.part == lv.PART.ITEMS:
        row = dsc.id //  obj.get_col_cnt()
        col = dsc.id - row * obj.get_col_cnt()

        # 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.palette_main(lv.PALETTE.BLUE).color_mix(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
        elif col == 0:
            dsc.label_dsc.flag = lv.TEXT_ALIGN.RIGHT

        # Make every 2nd row grayish
        if row != 0 and (row % 2) == 0:
            dsc.rect_dsc.bg_color = lv.palette_main(lv.PALETTE.GREY).color_mix(dsc.rect_dsc.bg_color, lv.OPA._10)
            dsc.rect_dsc.bg_opa = lv.OPA.COVER


table = lv.table(lv.scr_act())

# Fill the first column
table.set_cell_value(0, 0, "Name")
table.set_cell_value(1, 0, "Apple")
table.set_cell_value(2, 0, "Banana")
table.set_cell_value(3, 0, "Lemon")
table.set_cell_value(4, 0, "Grape")
table.set_cell_value(5, 0, "Melon")
table.set_cell_value(6, 0, "Peach")
table.set_cell_value(7, 0, "Nuts")

# Fill the second column
table.set_cell_value(0, 1, "Price")
table.set_cell_value(1, 1, "$7")
table.set_cell_value(2, 1, "$4")
table.set_cell_value(3, 1, "$6")
table.set_cell_value(4, 1, "$2")
table.set_cell_value(5, 1, "$5")
table.set_cell_value(6, 1, "$1")
table.set_cell_value(7, 1, "$9")

# Set a smaller height to the table. It'll make it scrollable
table.set_height(200)
table.center()

# Add an event callback to apply some custom drawing
table.add_event_cb(draw_part_event_cb, lv.EVENT.DRAW_PART_BEGIN, None)

---

Lightweighted list from table

C code  

 GitHub

#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(dsc->draw_ctx, &rect_dsc, &sw_area);

        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(dsc->draw_ctx, &rect_dsc, &sw_area);
    }
}

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 %"LV_PRIu32, 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, "%"LV_PRIu32" items were created in %"LV_PRIu32" ms\n"
                                  "using %"LV_PRIu32" bytes of memory",
                                  ITEM_CNT, elaps, mem_used);

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

}

#endif

MicroPython code  

 GitHub Simulator

from utime import ticks_ms
import gc

ITEM_CNT = 200

def draw_event_cb(e):
    obj = e.get_target()
    dsc = lv.obj_draw_part_dsc_t.__cast__(e.get_param())
    # If the cells are drawn...
    if dsc.part == lv.PART.ITEMS:
        chk = obj.has_cell_ctrl(dsc.id, 0, lv.table.CELL_CTRL.CUSTOM_1)

        rect_dsc = lv.draw_rect_dsc_t()
        rect_dsc.init()

        if chk:
            rect_dsc.bg_color = lv.theme_get_color_primary(obj)
        else:
            rect_dsc.bg_color = lv.palette_lighten(lv.PALETTE.GREY, 2)
            
        rect_dsc.radius = lv.RADIUS.CIRCLE

        sw_area = lv.area_t()
        sw_area.x1 = dsc.draw_area.x2 - 50
        sw_area.x2 = sw_area.x1 + 40
        sw_area.y1 = dsc.draw_area.y1 + dsc.draw_area.get_height() // 2 - 10
        sw_area.y2 = sw_area.y1 + 20
        dsc.draw_ctx.rect(rect_dsc, sw_area)
         
        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
        dsc.draw_ctx.rect(rect_dsc, sw_area)

def change_event_cb(e):
    obj = e.get_target()
    row = lv.C_Pointer()
    col = lv.C_Pointer()
    table.get_selected_cell(row, col)
    # print("row: ",row.uint_val)

    chk = table.has_cell_ctrl(row.uint_val, 0, lv.table.CELL_CTRL.CUSTOM_1)
    if chk:
        table.clear_cell_ctrl(row.uint_val, 0, lv.table.CELL_CTRL.CUSTOM_1)
    else:
        table.add_cell_ctrl(row.uint_val, 0, lv.table.CELL_CTRL.CUSTOM_1)

#
# A very light-weighted list created from table
#

# Measure memory usage
gc.enable()
gc.collect()
mem_free = gc.mem_free()
print("mem_free: ", mem_free)
t = ticks_ms()
print("ticks: ", t)
table = lv.table(lv.scr_act())

# Set a smaller height to the table. It'll make it scrollable
table.set_size(150, 200)

table.set_col_width(0, 150)
table.set_row_cnt(ITEM_CNT)  # Not required but avoids a lot of memory reallocation lv_table_set_set_value
table.set_col_cnt(1)

# Don't make the cell pressed, we will draw something different in the event
table.remove_style(None, lv.PART.ITEMS | lv.STATE.PRESSED)

for i in range(ITEM_CNT):
    table.set_cell_value(i, 0, "Item " + str(i+1))

table.align(lv.ALIGN.CENTER, 0, -20)

# Add an event callback to apply some custom drawing
table.add_event_cb(draw_event_cb, lv.EVENT.DRAW_PART_END, None)
table.add_event_cb(change_event_cb, lv.EVENT.VALUE_CHANGED, None)

gc.collect()
mem_used = mem_free - gc.mem_free()
elaps = ticks_ms()-t

label = lv.label(lv.scr_act())
label.set_text(str(ITEM_CNT) + " items were created in " + str(elaps) + " ms\n using " + str(mem_used) + " bytes of memory")
#label.set_text(str(ITEM_CNT) + " items were created in " + str(elaps) + " ms")

label.align(lv.ALIGN.BOTTOM_MID, 0, -10)

---

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

enum lv_table_draw_part_type_t

type field in lv_obj_draw_part_dsc_t if class_p = lv_table_class Used in LV_EVENT_DRAW_PART_BEGIN and LV_EVENT_DRAW_PART_END

Values:

enumerator LV_TABLE_DRAW_PART_CELL

A cell

Functions

LV_EXPORT_CONST_INT(LV_TABLE_CELL_NONE)

lv_obj_t *lv_table_create(lv_obj_t *parent)

Create a table object

参数

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

返回

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.

注解

New roes/columns are added automatically if required

参数

• 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.

注解

New roes/columns are added automatically if required

参数

• 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

参数

• 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

参数

• 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

参数

• 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.

参数

• 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.

参数

• 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.

参数

• obj -- pointer to a Table object

• row -- id of the row [0 .. row_cnt -1]

• col -- id of the column [0 .. col_cnt -1]

返回

text in the cell

uint16_t lv_table_get_row_cnt(lv_obj_t *obj)

Get the number of rows.

参数

obj -- table pointer to a Table object

返回

number of rows.

uint16_t lv_table_get_col_cnt(lv_obj_t *obj)

Get the number of columns.

参数

obj -- table pointer to a Table object

返回

number of columns.

lv_coord_t lv_table_get_col_width(lv_obj_t *obj, uint16_t col)

Get the width of a column

参数

• obj -- table pointer to a Table object

• col -- id of the column [0 .. LV_TABLE_COL_MAX -1]

返回

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

参数

• 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

返回

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)

参数

• 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