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//! Clipboard master
//!
//! Provides simple way to track updates of clipboard.
//!
//! ## Example:
//!
//! ```rust,no_run
//! extern crate clipboard_master;
//!
//! use clipboard_master::{Master, ClipboardHandler, CallbackResult};
//!
//! use std::io;
//!
//! struct Handler;
//!
//! impl ClipboardHandler for Handler {
//!     fn on_clipboard_change(&mut self) -> CallbackResult {
//!         println!("Clipboard change happened!");
//!         CallbackResult::Next
//!     }
//!
//!     fn on_clipboard_error(&mut self, error: io::Error) -> CallbackResult {
//!         eprintln!("Error: {}", error);
//!         CallbackResult::Next
//!     }
//! }
//!
//! fn main() {
//!     let _ = Master::new(Handler).run();
//! }
//! ```
use std::io;

mod master;

///Describes Clipboard handler
pub trait ClipboardHandler {
    ///Callback to call on clipboard change.
    fn on_clipboard_change(&mut self) -> CallbackResult;
    ///Callback to call on when error happens in master.
    fn on_clipboard_error(&mut self, error: io::Error) -> CallbackResult {
        CallbackResult::StopWithError(error)
    }

    #[inline(always)]
    ///Returns sleep interval for polling implementations (e.g. Mac).
    ///
    ///Default value is 500ms
    fn sleep_interval(&self) -> core::time::Duration {
        core::time::Duration::from_millis(500)
    }
}

///Possible return values of callback.
pub enum CallbackResult {
    ///Wait for next clipboard change.
    Next,
    ///Stop handling messages.
    Stop,
    ///Special variant to propagate IO Error from callback.
    StopWithError(io::Error)
}

///Clipboard master.
///
///Tracks changes of clipboard and invokes corresponding callbacks.
///
///# Platform notes:
///
///- On `windows` it creates dummy window that monitors each clipboard change message.
pub struct Master<H> {
    handler: H
}

impl<H: ClipboardHandler> Master<H> {
    ///Creates new instance.
    pub fn new(handler: H) -> Self {
        Master {
            handler
        }
    }
}