use crate::{view::ViewWrapper, Vec2, View};
type Callback<V> = dyn FnMut(&mut V, Vec2);
/// View wrapper overriding the `View::layout` method.
pub struct OnLayoutView<V> {
view: V,
on_layout: Box<Callback<V>>,
}
impl<V> OnLayoutView<V> {
/// Wraps a view in an `OnLayoutView`.
///
/// Will run the given closure for layout _instead_ of the one from `view`.
///
/// ```rust
/// use cursive_core::{
/// views::{OnLayoutView, TextView},
/// View,
/// };
///
/// let view = TextView::new("foo");
///
/// // Here we just run the innver view's layout.
/// OnLayoutView::new(view, |v, s| v.layout(s));
/// ```
pub fn new<F>(view: V, on_layout: F) -> Self
where
F: FnMut(&mut V, Vec2) + 'static,
{
let on_layout = Box::new(on_layout);
OnLayoutView { view, on_layout }
}
/// Wraps a view in an `OnLayoutView`.
///
/// This is a shortcut for `Self::new(view, V::layout)`
///
/// You can change it later with `set_on_layout`.
pub fn wrap(view: V) -> Self
where
V: View,
{
Self::new(view, V::layout)
}
/// Replaces the callback to run.
pub fn set_on_layout<F>(&mut self, on_layout: F)
where
F: FnMut(&mut V, Vec2) + 'static,
{
self.on_layout = Box::new(on_layout);
}
inner_getters!(self.view: V);
}
impl<V: View> ViewWrapper for OnLayoutView<V> {
wrap_impl!(self.view: V);
fn wrap_layout(&mut self, size: Vec2) {
(self.on_layout)(&mut self.view, size);
}
}