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use crate::{Event, Frame, Handler, Insets, Modified, ModifierNode, Vec2, View};

/// An extension trait with various convenience methods for views.
pub trait ViewExt: Sized {
    fn modifier(self, modifier: ModifierNode) -> Modified<Self> {
        Modified::new(self, modifier)
    }

    fn padding(self, insets: impl Into<Insets>) -> Modified<Self> {
        self.modifier(ModifierNode::Padding { insets: insets.into() })
    }

    fn position(self, position: Vec2<f64>) -> Modified<Self> {
        self.modifier(ModifierNode::Position { position })
    }

    fn frame(self, frame: impl Into<Frame>) -> Modified<Self> {
        self.modifier(ModifierNode::Frame { frame: frame.into() })
    }

    fn on_appear(self, action: impl Fn() + 'static) -> Handler<Self, impl Fn(Event)> {
        Handler::new(self, move |e| {
            if let Event::Appear = e {
                action();
            }
        })
    }

    fn on_disappear(self, action: impl Fn() + 'static) -> Handler<Self, impl Fn(Event)> {
        Handler::new(self, move |e| {
            if let Event::Disappear = e {
                action();
            }
        })
    }
}

impl<T> ViewExt for T where T: View {}