Node / public / precursor-lxmfchat.git / files / xous-core / services / content-plugin-api / src / lib.rs

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#![cfg_attr(target_os = "none", no_std)]

use xous::{CID, Message, ScalarMessage, send_message};

#[derive(Debug)]

pub enum Opcode {

/// request a redraw of our canvas

Redraw,

}

impl core::convert::TryFrom<&Message> for Opcode {

type Error = &'static str;

fn try_from(message: &Message) -> Result<Self, Self::Error> {

match message {

Message::Scalar(m) => match m.id {

0 => Ok(Opcode::Redraw),

_ => Err("SHCH api: unknown Scalar ID"),

},

_ => Err("SHCH api: unhandled message type"),

}

}

}

impl From<Opcode> for Message {

fn from(opcode: Opcode) -> Message {

match opcode {

Opcode::Redraw => Message::Scalar(ScalarMessage { id: 0, arg1: 0, arg2: 0, arg3: 0, arg4: 0 }),

// _ => panic!("SHCH api: Opcode type not handled by From<Opcode>, refer to helper method"),

}

}

}

pub trait ContentCanvasApi {

fn redraw_canvas(&self) -> Result<(), xous::Error>;

}

pub struct ContentCanvasConnection {

pub connection: Option<CID>,

pub redraw_id: Option<usize>,

}

impl ContentCanvasApi for ContentCanvasConnection {

fn redraw_canvas(&self) -> Result<(), xous::Error> {

if let Some(id) = self.redraw_id {

match self.connection {

Some(cid) => send_message(cid, Message::new_scalar(id, 0, 0, 0, 0)).map(|_| ()),

_ => Err(xous::Error::UseBeforeInit),

}

} else {

Err(xous::Error::UseBeforeInit)

}

}

}