i_slint_core/
date_time.rs

1// Copyright © SixtyFPS GmbH <info@slint.dev>
2// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0
3
4use crate::SharedString;
5#[cfg(feature = "std")]
6use chrono::Local;
7use chrono::{Datelike, NaiveDate};
8
9pub fn use_24_hour_format() -> bool {
10    true
11}
12
13/// Returns the number of days in a given month
14pub fn month_day_count(month: u32, year: i32) -> Option<i32> {
15    Some(
16        NaiveDate::from_ymd_opt(
17            match month {
18                12 => year + 1,
19                _ => year,
20            },
21            match month {
22                12 => 1,
23                _ => month + 1,
24            },
25            1,
26        )?
27        .signed_duration_since(NaiveDate::from_ymd_opt(year, month, 1)?)
28        .num_days() as i32,
29    )
30}
31
32pub fn month_offset(month: u32, year: i32) -> i32 {
33    if let Some(date) = NaiveDate::from_ymd_opt(year, month, 1) {
34        let offset = date.weekday().number_from_monday() as i32;
35
36        // sunday
37        if offset >= 7 {
38            return 0;
39        }
40
41        return offset;
42    }
43
44    // The result is only None if month == 0, it should not happen because the function is only
45    // used internal and not directly by the user. So it is ok to return 0 on a None result
46    0
47}
48
49pub fn format_date(format: &str, day: u32, month: u32, year: i32) -> SharedString {
50    if let Some(date) = NaiveDate::from_ymd_opt(year, month, day) {
51        return crate::format!("{}", date.format(format));
52    }
53
54    // Don't panic, this function is used only internal
55    SharedString::default()
56}
57
58pub fn parse_date(date: &str, format: &str) -> Option<[i32; 3]> {
59    NaiveDate::parse_from_str(date, format)
60        .ok()
61        .map(|date| [date.day() as i32, date.month() as i32, date.year()])
62}
63
64#[cfg(feature = "std")]
65pub fn date_now() -> [i32; 3] {
66    let now = Local::now().date_naive();
67    [now.day() as i32, now.month() as i32, now.year()]
68}
69
70// display the today date is currently not implemented for no_std
71#[cfg(not(feature = "std"))]
72pub fn date_now() -> [i32; 3] {
73    [-1, -1, -1]
74}
75
76#[cfg(feature = "ffi")]
77mod ffi {
78    #![allow(unsafe_code)]
79
80    use super::*;
81
82    #[unsafe(no_mangle)]
83    pub extern "C" fn slint_date_time_use_24_hour_format() -> bool {
84        use_24_hour_format()
85    }
86
87    #[unsafe(no_mangle)]
88    pub extern "C" fn slint_date_time_month_day_count(month: u32, year: i32) -> i32 {
89        month_day_count(month, year).unwrap_or(0)
90    }
91
92    #[unsafe(no_mangle)]
93    pub extern "C" fn slint_date_time_month_offset(month: u32, year: i32) -> i32 {
94        month_offset(month, year)
95    }
96
97    #[unsafe(no_mangle)]
98    pub extern "C" fn slint_date_time_format_date(
99        format: &SharedString,
100        day: u32,
101        month: u32,
102        year: i32,
103        out: &mut SharedString,
104    ) {
105        *out = format_date(format, day, month, year)
106    }
107
108    #[unsafe(no_mangle)]
109    pub extern "C" fn slint_date_time_date_now(d: &mut i32, m: &mut i32, y: &mut i32) {
110        [*d, *m, *y] = date_now();
111    }
112
113    #[unsafe(no_mangle)]
114    pub extern "C" fn slint_date_time_parse_date(
115        date: &SharedString,
116        format: &SharedString,
117        d: &mut i32,
118        m: &mut i32,
119        y: &mut i32,
120    ) -> bool {
121        if let Some(x) = parse_date(date, format) {
122            [*d, *m, *y] = x;
123            true
124        } else {
125            false
126        }
127    }
128}
i_slint_core/date_time.rs

i_slint_core/
date_time.rs
