You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
3.2 KiB
Markdown
90 lines
3.2 KiB
Markdown
2 years ago
|
# Menu (lv_menu)
|
||
|
|
|
||
|
|
## Overview
|
||
|
|
The menu widget can be used to easily create multi-level menus. It handles the traversal between pages automatically.
|
||
|
|
|
||
|
|
## Parts and Styles
|
||
|
|
The menu widget is built from the following objects:
|
||
|
|
- Main container: lv_menu_main_cont
|
||
|
|
- Main header: lv_menu_main_header_cont
|
||
|
|
- Back btn: [lv_btn](/widgets/core/btn)
|
||
|
|
- Back btn icon: [lv_img](/widgets/core/img)
|
||
|
|
- Main page: lv_menu_page
|
||
|
|
- Sidebar container: lv_menu_sidebar_cont
|
||
|
|
- Sidebar header: lv_menu_sidebar_header_cont
|
||
|
|
- Back btn: [lv_btn](/widgets/core/btn)
|
||
|
|
- Back btn icon: [lv_img](/widgets/core/img)
|
||
|
|
- Sidebar page: lv_menu_page
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
|
||
|
|
### Create a menu
|
||
|
|
`lv_menu_create(parent)` creates a new empty menu.
|
||
|
|
|
||
|
|
### Header mode
|
||
|
|
The following header modes exist:
|
||
|
|
- `LV_MENU_HEADER_TOP_FIXED` Header is positioned at the top.
|
||
|
|
- `LV_MENU_HEADER_TOP_UNFIXED` Header is positioned at the top and can be scrolled out of view.
|
||
|
|
- `LV_MENU_HEADER_BOTTOM_FIXED` Header is positioned at the bottom.
|
||
|
|
|
||
|
|
You can set header modes with `lv_menu_set_mode_header(menu, LV_MENU_HEADER...)`.
|
||
|
|
|
||
|
|
### Root back button mode
|
||
|
|
The following root back button modes exist:
|
||
|
|
- `LV_MENU_ROOT_BACK_BTN_DISABLED`
|
||
|
|
- `LV_MENU_ROOT_BACK_BTN_ENABLED`
|
||
|
|
|
||
|
|
You can set root back button modes with `lv_menu_set_mode_root_back_btn(menu, LV_MENU_ROOT_BACK_BTN...)`.
|
||
|
|
|
||
|
|
### Create a menu page
|
||
|
|
`lv_menu_page_create(menu, title)` creates a new empty menu page.
|
||
|
|
You can add any widgets to the page.
|
||
|
|
|
||
|
|
### Set a menu page in the main area
|
||
|
|
Once a menu page has been created, you can set it to the main area with `lv_menu_set_page(menu, page)`. NULL to clear main and clear menu history.
|
||
|
|
|
||
|
|
### Set a menu page in the sidebar
|
||
|
|
Once a menu page has been created, you can set it to the sidebar with `lv_menu_set_sidebar_page(menu, page)`. NULL to clear sidebar.
|
||
|
|
|
||
|
|
### Linking between menu pages
|
||
|
|
For instance, you have created a btn obj in the main page. When you click the btn obj, you want it to open up a new page, use `lv_menu_set_load_page_event(menu, obj, new page)`.
|
||
|
|
|
||
|
|
### Create a menu container, section, separator
|
||
|
|
The following objects can be created so that it is easier to style the menu:
|
||
|
|
|
||
|
|
`lv_menu_cont_create(parent page)` creates a new empty container.
|
||
|
|
|
||
|
|
`lv_menu_section_create(parent page)` creates a new empty section.
|
||
|
|
|
||
|
|
`lv_menu_separator_create(parent page)` creates a separator.
|
||
|
|
|
||
|
|
## Events
|
||
|
|
- `LV_EVENT_VALUE_CHANGED` Sent when a page is shown.
|
||
|
|
- `lv_menu_get_cur_main_page(menu)` returns a pointer to menu page that is currently displayed in main.
|
||
|
|
- `lv_menu_get_cur_sidebar_page(menu)` returns a pointer to menu page that is currently displayed in sidebar.
|
||
|
|
- `LV_EVENT_CLICKED` Sent when a back btn in a header from either main or sidebar is clicked. `LV_OBJ_FLAG_EVENT_BUBBLE` is enabled on the buttons so you can add events to the menu itself.
|
||
|
|
- `lv_menu_back_btn_is_root(menu, btn)` to check if btn is root back btn
|
||
|
|
|
||
|
|
See the events of the [Base object](/widgets/obj) too.
|
||
|
|
|
||
|
|
Learn more about [Events](/overview/event).
|
||
|
|
|
||
|
|
## Keys
|
||
|
|
No keys are handled by the menu widget.
|
||
|
|
|
||
|
|
Learn more about [Keys](/overview/indev).
|
||
|
|
|
||
|
|
|
||
|
|
## Example
|
||
|
|
|
||
|
|
```eval_rst
|
||
|
|
.. include:: ../../../examples/widgets/menu/index.rst
|
||
|
|
```
|
||
|
|
|
||
|
|
## API
|
||
|
|
|
||
|
|
```eval_rst
|
||
|
|
.. doxygenfile:: lv_menu.h
|
||
|
|
:project: lvgl
|
||
|
|
|
||
|
|
```
|