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86 lines
3.6 KiB
Markdown
86 lines
3.6 KiB
Markdown
# Calendar (lv_calendar)
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**From v8.1 the header is added directly into the Calendar widget and the API of the headers has been changed.**
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## Overview
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The Calendar object is a classic calendar which can:
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- show the days of any month in a 7x7 matrix
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- Show the name of the days
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- highlight the current day (today)
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- highlight any user-defined dates
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The Calendar is added to the default group (if it is set). Calendar is an editable object which allow selecting and clicking the dates with encoder navigation too.
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To make the Calendar flexible, by default it doesn't show the current year or month. Instead, there are optional "headers" that can be attached to the calendar.
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## Parts and Styles
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The Calendar is composed of 3 widegets
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- Container: A rectangle which is a container for the *Header* and the *Days*. Uses only `LV_PART_MAIN` where all the background related style properties are working.
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- Days: It's a [Button matrix](/widgets/core/btnmatrix) object under the hood to arrange the days into a matrix. `lv_calendar_get_btnmatrix(calendar)` can be used to get it.
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- `LV_PART_MAIN` The background of the calendar. Uses all the background related style properties.
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- `LV_PART_ITEMS` Refers to the dates and day names. Button matrix control flags are set to differentiate the buttons and a custom drawer event is added modify the properties of the buttons as follows:
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- day names have no border, no background and drawn with a gray color
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- days of the previous and next month have `LV_BTNMATRIX_CTRL_DISABLED` flag
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- today has a thicker border with the theme's primary color
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- highlighted days have some opacity with the theme's primary color.
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- Header: Not created by default, the details are up to the given header.
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## Usage
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Some functions use the `lv_calendar_date_t` type which is a structure with `year`, `month` and `day` fields.
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### Current date
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To set the current date (today), use the `lv_calendar_set_today_date(calendar, year, month, day)` function. `month` needs to be in 1..12 range and `day` in 1..31 range.
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### Shown date
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To set the shown date, use `lv_calendar_set_shown_date(calendar, year, month)`;
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### Highlighted days
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The list of highlighted dates should be stored in a `lv_calendar_date_t` array loaded by `lv_calendar_set_highlighted_dates(calendar, highlighted_dates, date_num)`.
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Only the array's pointer will be saved so the array should be a static or global variable.
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### Name of the days
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The name of the days can be adjusted with `lv_calendar_set_day_names(calendar, day_names)` where `day_names` looks like `const char * day_names[7] = {"Su", "Mo", ...};`
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Only the pointer of the day names is saved so the elements should be static, global or constant variables.
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## Events
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- `LV_EVENT_VALUE_CHANGED` Sent if a date is clicked. `lv_calendar_get_pressed_date(calendar, &date)` set `date` to the date currently being pressed. Returns `LV_RES_OK` if there is a valid pressed date, else `LV_RES_INV`.
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Learn more about [Events](/overview/event).
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## Keys
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- `LV_KEY_RIGHT/UP/LEFT/RIGHT` To navigate among the buttons to dates
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- `LV_KEY_ENTER` To press/release the selected date
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Learn more about [Keys](/overview/indev).
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## Headers
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### Arrow buttons
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`lv_calendar_header_arrow_create(calendar)` creates a header that contains a left and right arrow on the sides and a text with the current year and month between them.
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### Drop-down
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`lv_calendar_header_dropdown_create(calendar)` creates a header that contains 2 drop-drown lists: one for the year and another for the month.
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## Example
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```eval_rst
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.. include:: ../../../examples/widgets/calendar/index.rst
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```
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## API
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```eval_rst
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.. doxygenfile:: lv_calendar.h
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:project: lvgl
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```
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