druid-shell 0.3.2

Platform abstracting application shell used for druid toolkit.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63

// Copyright 2019 The xi-editor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Utilities, macOS specific.

use cocoa::base::{id, nil, BOOL, YES};
use cocoa::foundation::{NSAutoreleasePool, NSString};

pub fn init() {}

/// Panic if not on the main thread.assert_main_thread()
///
/// Many Cocoa operations are only valid on the main thread, and (I think)
/// undefined behavior is possible if invoked from other threads. If so,
/// failing on non main thread is necessary for safety.
pub fn assert_main_thread() {
    unsafe {
        let is_main_thread: BOOL = msg_send!(class!(NSThread), isMainThread);
        assert_eq!(is_main_thread, YES);
    }
}

/// Create a new NSString from a &str.
pub(crate) fn make_nsstring(s: &str) -> id {
    unsafe { NSString::alloc(nil).init_str(s).autorelease() }
}

pub(crate) fn from_nsstring(s: id) -> String {
    unsafe {
        let slice = std::slice::from_raw_parts(s.UTF8String() as *const _, s.len());
        let result = std::str::from_utf8_unchecked(slice);
        result.into()
    }
}

/// Returns the current locale string.
///
/// This should a [Unicode language identifier].
///
/// [Unicode language identifier]: https://unicode.org/reports/tr35/#Unicode_language_identifier
pub fn get_locale() -> String {
    unsafe {
        let nslocale_class = class!(NSLocale);
        let locale: id = msg_send![nslocale_class, currentLocale];
        let ident: id = msg_send![locale, localeIdentifier];
        let mut locale = from_nsstring(ident);
        if let Some(idx) = locale.chars().position(|c| c == '@') {
            locale.truncate(idx);
        }
        locale
    }
}