msgbox 0.3.0

Simple, cross-platform message box GUI library. All it does is to show a message box modal with a OK button, which runs synchronously. All the other jobs stop until the user responds. It runs fine with OpenGL windows already open. It supports multi-platform, and maintains separate dependencies per platform, thus light-weight. - Synchronous Message Modal - Multi-platform (Linux GTK3+, Windows and OSX) - Light-weight
Documentation 
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use ::cocoa::base::{id, nil};
use ::cocoa::foundation::NSString;

use icon::IconType;

/**
 * cocoa-rs doesn't implement NSAlert yet (0.14.0)
 * Then implement it!
 * Someone would stub and implement all methods for NSAlert, and make it to the upstream?
 */

/**
 * NSAlert.Style
 * https://developer.apple.com/documentation/appkit/nsalert.style
 */
#[repr(u64)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum NSAlertStyle {
    warning         = 0, // Same visual as informational
    informational   = 1,
    critical        = 2
}

/**
 * NSAlert
 * https://developer.apple.com/documentation/appkit/nsalert
 */
pub trait NSAlert: Sized {
    unsafe fn alloc(_: Self) -> id {
        msg_send![class!(NSAlert), alloc]
    }

    unsafe fn init(self) -> id;
    unsafe fn autorelease(self) -> id;

    unsafe fn setAlertStyle(self, style: NSAlertStyle);
    unsafe fn setMessageText(self, messageText: id);
    unsafe fn setInformativeText(self, informativeText: id);
    unsafe fn addButton(self, withTitle: id);
    unsafe fn runModal(self) -> id;
}

impl NSAlert for id {
    unsafe fn init(self) -> id {
        msg_send![self, init]
    }

    unsafe fn autorelease(self) -> id {
        msg_send![self, autorelease]
    }

    unsafe fn setAlertStyle(self, alertStyle: NSAlertStyle) {
        msg_send![self, setAlertStyle: alertStyle]
    }

    unsafe fn setMessageText(self, messageText: id) {
        msg_send![self, setMessageText: messageText]
    }

    unsafe fn setInformativeText(self, informativeText: id) {
        msg_send![self, setInformativeText: informativeText]
    }

    unsafe fn addButton(self, withTitle: id) {
        msg_send![self, addButtonWithTitle: withTitle]
    }

    unsafe fn runModal(self) -> id {
        msg_send![self, runModal]
    }
}

pub fn create(title:&str, content:&str, icon_type:IconType) {
    let alert_style = match icon_type {
        IconType::Error => NSAlertStyle::critical,
        IconType::Info => NSAlertStyle::informational,

        // AppKit doesn't support NSAlert without any icon
        IconType::None => NSAlertStyle::informational,
    };

    unsafe {
        let alert = NSAlert::alloc(nil).init().autorelease();
        alert.addButton(NSString::alloc(nil).init_str("OK"));
        alert.setMessageText(NSString::alloc(nil).init_str(title));
        alert.setInformativeText(NSString::alloc(nil).init_str(content));
        alert.setAlertStyle(alert_style);
        alert.runModal();
    }
}