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use super::{Context, MessageBox, Registry};
use std::any::Any;

pub trait AsAny: Any {
    fn as_any(&self) -> &dyn Any;

    fn as_any_mut(&mut self) -> &mut dyn Any;
}

/// Used to define a state of a widget.
///
/// A state is used to operate on the properties (components) of the widget, its parent or children.
pub trait State: AsAny {
    /// Init is used for initial setup.
    fn init(&mut self, _: &mut Registry, _: &mut Context) {}

    /// Used to cleanup the state and is called after window close is requested.
    fn cleanup(&mut self, _: &mut Registry, _: &mut Context) {}

    /// Updates the state for the given `ctx`.
    ///
    /// This update method is called before layout is calculated.
    fn update(&mut self, _: &mut Registry, _: &mut Context) {}

    /// Updates the state for the given `ctx`.
    ///
    /// This update method is called after layout is calculated and before rendering.
    fn update_post_layout(&mut self, _: &mut Registry, _: &mut Context) {}

    /// Receives all messages from the message channel. This message is only called if the state has messages.
    fn receive_messages(&mut self, _: &mut Registry, _: &mut Context, _messages: &[MessageBox]) {}
}