Tabview (lv_tabview)

Overview

The Tab view object can be used to organize content in tabs. The Tab view is built from other widgets:

The tab buttons can be positioned on the top, bottom, left and right side of the Tab view.

A new tab can be selected either by clicking on a tab button or by sliding horizontally on the content.

Parts and Styles

There are no special parts on the Tab view but the lv_obj and lv_btnnmatrix widgets are used to create the Tab view.

Usage

Create a Tab view

lv_tabview_create(parent, tab_pos, tab_size); creates a new empty Tab view. tab_pos can be LV_DIR_TOP/BOTTOM/LEFT/RIGHT to position the tab buttons to a side. tab_size is the height (in case of LV_DIR_TOP/BOTTOM) or width (in case of LV_DIR_LEFT/RIGHT) tab buttons.

Add tabs

New tabs can be added with lv_tabview_add_tab(tabview, "Tab name"). This will return a pointer to an lv_obj object where the tab's content can be created.

Rename tabs

A tab can be renamed with lv_tabview_rename_tab(tabview, tab_id, "New Name").

Change tab

To select a new tab you can:

  • Click on its tab button

  • Slide horizontally

  • Use lv_tabview_set_act(tabview, id, LV_ANIM_ON/OFF) function

Get the parts

lv_tabview_get_content(tabview) returns the container for the tabs, lv_tabview_get_tab_btns(tabview) returns the Tab buttons object which is a Button matrix.

Events

  • LV_EVENT_VALUE_CHANGED Sent when a new tab is selected by sliding or clicking the tab button. lv_tabview_get_tab_act(tabview) returns the zero based index of the current tab.

Learn more about Events.

Keys

Keys have effect only on the tab buttons (Button matrix). Add manually to a group if required.

Learn more about Keys.

Example

Simple Tabview

C code  

 GitHub
#include "../../lv_examples.h"
#if LV_USE_TABVIEW && LV_BUILD_EXAMPLES

void lv_example_tabview_1(void)
{
    /*Create a Tab view object*/
    lv_obj_t * tabview;
    tabview = lv_tabview_create(lv_scr_act(), LV_DIR_TOP, 50);

    /*Add 3 tabs (the tabs are page (lv_page) and can be scrolled*/
    lv_obj_t * tab1 = lv_tabview_add_tab(tabview, "Tab 1");
    lv_obj_t * tab2 = lv_tabview_add_tab(tabview, "Tab 2");
    lv_obj_t * tab3 = lv_tabview_add_tab(tabview, "Tab 3");

    /*Add content to the tabs*/
    lv_obj_t * label = lv_label_create(tab1);
    lv_label_set_text(label, "This the first tab\n\n"
                      "If the content\n"
                      "of a tab\n"
                      "becomes too\n"
                      "longer\n"
                      "than the\n"
                      "container\n"
                      "then it\n"
                      "automatically\n"
                      "becomes\n"
                      "scrollable.\n"
                      "\n"
                      "\n"
                      "\n"
                      "Can you see it?");

    label = lv_label_create(tab2);
    lv_label_set_text(label, "Second tab");

    label = lv_label_create(tab3);
    lv_label_set_text(label, "Third tab");

    lv_obj_scroll_to_view_recursive(label, LV_ANIM_ON);

}
#endif

MicroPython code  

 GitHub Simulator
# Create a Tab view object
tabview = lv.tabview(lv.scr_act(), lv.DIR.TOP, 50)

# Add 3 tabs (the tabs are page (lv_page) and can be scrolled
tab1 = tabview.add_tab("Tab 1")
tab2 = tabview.add_tab("Tab 2")
tab3 = tabview.add_tab("Tab 3")

# Add content to the tabs
label = lv.label(tab1)
label.set_text("""This the first tab

If the content
of a tab
becomes too
longer
than the
container
then it
automatically
becomes
scrollable.



Can you see it?""")

label = lv.label(tab2)
label.set_text("Second tab")

label = lv.label(tab3)
label.set_text("Third tab");

label.scroll_to_view_recursive(lv.ANIM.ON)


Tabs on the left, styling and no scrolling

C code  

 GitHub
#include "../../lv_examples.h"
#if LV_USE_TABVIEW && LV_BUILD_EXAMPLES

static void scroll_begin_event(lv_event_t * e)
{
    /*Disable the scroll animations. Triggered when a tab button is clicked */
    if(lv_event_get_code(e) == LV_EVENT_SCROLL_BEGIN) {
        lv_anim_t * a = lv_event_get_param(e);
        if(a)  a->time = 0;
    }
}

void lv_example_tabview_2(void)
{
    /*Create a Tab view object*/
    lv_obj_t * tabview;
    tabview = lv_tabview_create(lv_scr_act(), LV_DIR_LEFT, 80);
    lv_obj_add_event(lv_tabview_get_content(tabview), scroll_begin_event, LV_EVENT_SCROLL_BEGIN, NULL);

    lv_obj_set_style_bg_color(tabview, lv_palette_lighten(LV_PALETTE_RED, 2), 0);

    lv_obj_t * tab_btns = lv_tabview_get_tab_btns(tabview);
    lv_obj_set_style_bg_color(tab_btns, lv_palette_darken(LV_PALETTE_GREY, 3), 0);
    lv_obj_set_style_text_color(tab_btns, lv_palette_lighten(LV_PALETTE_GREY, 5), 0);
    lv_obj_set_style_border_side(tab_btns, LV_BORDER_SIDE_RIGHT, LV_PART_ITEMS | LV_STATE_CHECKED);


    /*Add 3 tabs (the tabs are page (lv_page) and can be scrolled*/
    lv_obj_t * tab1 = lv_tabview_add_tab(tabview, "Tab 1");
    lv_obj_t * tab2 = lv_tabview_add_tab(tabview, "Tab 2");
    lv_obj_t * tab3 = lv_tabview_add_tab(tabview, "Tab 3");
    lv_obj_t * tab4 = lv_tabview_add_tab(tabview, "Tab 4");
    lv_obj_t * tab5 = lv_tabview_add_tab(tabview, "Tab 5");

    lv_obj_set_style_bg_color(tab2, lv_palette_lighten(LV_PALETTE_AMBER, 3), 0);
    lv_obj_set_style_bg_opa(tab2, LV_OPA_COVER, 0);

    /*Add content to the tabs*/
    lv_obj_t * label = lv_label_create(tab1);
    lv_label_set_text(label, "First tab");

    label = lv_label_create(tab2);
    lv_label_set_text(label, "Second tab");

    label = lv_label_create(tab3);
    lv_label_set_text(label, "Third tab");

    label = lv_label_create(tab4);
    lv_label_set_text(label, "Forth tab");

    label = lv_label_create(tab5);
    lv_label_set_text(label, "Fifth tab");

    lv_obj_clear_flag(lv_tabview_get_content(tabview), LV_OBJ_FLAG_SCROLLABLE);
}
#endif

MicroPython code  

 GitHub Simulator
def scroll_begin_event(e):

    #Disable the scroll animations. Triggered when a tab button is clicked */
    if e.get_code() == lv.EVENT.SCROLL_BEGIN:
        a = lv.anim_t.__cast__(e.get_param())
        if a:
            a.time = 0

# Create a Tab view object
tabview = lv.tabview(lv.scr_act(), lv.DIR.LEFT, 80)
tabview.get_content().add_event(scroll_begin_event, lv.EVENT.SCROLL_BEGIN, None)

tabview.set_style_bg_color(lv.palette_lighten(lv.PALETTE.RED, 2), 0)

tab_btns = tabview.get_tab_btns()
tab_btns.set_style_bg_color(lv.palette_darken(lv.PALETTE.GREY, 3), 0)
tab_btns.set_style_text_color(lv.palette_lighten(lv.PALETTE.GREY, 5), 0)
tab_btns.set_style_border_side(lv.BORDER_SIDE.RIGHT, lv.PART.ITEMS | lv.STATE.CHECKED)


# Add 3 tabs (the tabs are page (lv_page) and can be scrolled
tab1 = tabview.add_tab("Tab 1")
tab2 = tabview.add_tab("Tab 2")
tab3 = tabview.add_tab("Tab 3")
tab4 = tabview.add_tab("Tab 4")
tab5 = tabview.add_tab("Tab 5")

tab2.set_style_bg_color(lv.palette_lighten(lv.PALETTE.AMBER, 3), 0)
tab2.set_style_bg_opa(lv.OPA.COVER, 0)

# Add content to the tabs
label = lv.label(tab1)
label.set_text("First tab")

label = lv.label(tab2)
label.set_text("Second tab")

label = lv.label(tab3)
label.set_text("Third tab")

label = lv.label(tab4)
label.set_text("Forth tab")

label = lv.label(tab5)
label.set_text("Fifth tab")

tabview.get_content().clear_flag(lv.obj.FLAG.SCROLLABLE)


API

Functions

lv_obj_t *lv_tabview_create(lv_obj_t *parent, lv_dir_t tab_pos, lv_coord_t tab_size)
lv_obj_t *lv_tabview_add_tab(lv_obj_t *tv, const char *name)
void lv_tabview_rename_tab(lv_obj_t *obj, uint32_t tab_id, const char *new_name)
lv_obj_t *lv_tabview_get_content(lv_obj_t *tv)
lv_obj_t *lv_tabview_get_tab_btns(lv_obj_t *tv)
void lv_tabview_set_act(lv_obj_t *obj, uint32_t id, lv_anim_enable_t anim_en)
uint16_t lv_tabview_get_tab_act(lv_obj_t *tv)

Variables

const lv_obj_class_t lv_tabview_class
struct lv_tabview_t

Public Members

lv_obj_t obj
char **map
uint16_t tab_cnt
uint16_t tab_cur
lv_dir_t tab_pos