Tab View (lv_tabview)

Overview

The Tab View Widget can be used to organize content in tabs. The Tab View is built from other Widgets:

Main container: Base Widget
Tab buttons: an Base Widget with Button (lv_button)
Container for the tabs: Base Widget
Content of the tabs: Base Widget

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 Base Widget and Button (lv_button) Widgets are used to create the Tab View.

Usage

Creating a Tab View

lv_tabview_create(parent) creates a new empty Tab View.

Adding tabs

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

Renaming tabs

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

Navigating to a new tab

To select a new tab you can:

Click on its tab button
Slide horizontally
Use lv_tabview_set_active(tabview, tab_id, LV_ANIM_ON / OFF) function

Setting tab bar position

Using the lv_tabview_set_tab_bar_position(tabview, LV_DIR_LEFT / RIGHT / TOP / BOTTOM) the tab bar can be moved to any side.

Setting tab bar size

The size of the tab bar can be adjusted by lv_tabview_set_tab_bar_size(tabview, size) When tabs are on the top or bottom, this means the height of the tab bar, and when they are on the sides, it means the width.

Accessing the parts

lv_tabview_get_content(tabview) returns a pointer to the container for tabs content (a Base Widget)
lv_tabview_get_tab_bar(tabview) returns a pointer to the container for tab buttons (a Base Widget)

Events

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

Keys

Keys have effect only on the tab buttons. Programmatically add these buttons to a group if required.

Example

Simple Tabview

#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_screen_active());

    /*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

Tabs on the left, styling and no scrolling

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

/*A vertical tab view with disabled scrolling and some styling*/
void lv_example_tabview_2(void)
{
    /*Create a Tab view object*/
    lv_obj_t * tabview;
    tabview = lv_tabview_create(lv_screen_active());
    lv_tabview_set_tab_bar_position(tabview, LV_DIR_LEFT);
    lv_tabview_set_tab_bar_size(tabview, 80);

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

    lv_obj_t * tab_buttons = lv_tabview_get_tab_bar(tabview);
    lv_obj_set_style_bg_color(tab_buttons, lv_palette_darken(LV_PALETTE_GREY, 3), 0);
    lv_obj_set_style_text_color(tab_buttons, lv_palette_lighten(LV_PALETTE_GREY, 5), 0);
    lv_obj_set_style_border_side(tab_buttons, 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, "Fourth tab");

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

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

API

lv_api_map_v8.h

lv_tabview.h

lv_types.h