diff options
Diffstat (limited to 'web/src/element.rs')
-rw-r--r-- | web/src/element.rs | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/web/src/element.rs b/web/src/element.rs deleted file mode 100644 index 6bb90177..00000000 --- a/web/src/element.rs +++ /dev/null @@ -1,90 +0,0 @@ -use crate::{Bus, Color, Css, Widget}; - -use dodrio::bumpalo; -use std::rc::Rc; - -/// A generic [`Widget`]. -/// -/// It is useful to build composable user interfaces that do not leak -/// implementation details in their __view logic__. -/// -/// If you have a [built-in widget], you should be able to use `Into<Element>` -/// to turn it into an [`Element`]. -/// -/// [built-in widget]: mod@crate::widget -#[allow(missing_debug_implementations)] -pub struct Element<'a, Message> { - pub(crate) widget: Box<dyn Widget<Message> + 'a>, -} - -impl<'a, Message> Element<'a, Message> { - /// Create a new [`Element`] containing the given [`Widget`]. - pub fn new(widget: impl Widget<Message> + 'a) -> Self { - Self { - widget: Box::new(widget), - } - } - - /// Applies a transformation to the produced message of the [`Element`]. - /// - /// This method is useful when you want to decouple different parts of your - /// UI and make them __composable__. - pub fn map<F, B>(self, f: F) -> Element<'a, B> - where - Message: 'static, - B: 'static, - F: 'static + Fn(Message) -> B, - { - Element { - widget: Box::new(Map::new(self.widget, f)), - } - } - - /// Marks the [`Element`] as _to-be-explained_. - pub fn explain(self, _color: Color) -> Element<'a, Message> { - self - } - - /// Produces a VDOM node for the [`Element`]. - pub fn node<'b>( - &self, - bump: &'b bumpalo::Bump, - bus: &Bus<Message>, - style_sheet: &mut Css<'b>, - ) -> dodrio::Node<'b> { - self.widget.node(bump, bus, style_sheet) - } -} - -struct Map<'a, A, B> { - widget: Box<dyn Widget<A> + 'a>, - mapper: Rc<Box<dyn Fn(A) -> B>>, -} - -impl<'a, A, B> Map<'a, A, B> { - pub fn new<F>(widget: Box<dyn Widget<A> + 'a>, mapper: F) -> Map<'a, A, B> - where - F: 'static + Fn(A) -> B, - { - Map { - widget, - mapper: Rc::new(Box::new(mapper)), - } - } -} - -impl<'a, A, B> Widget<B> for Map<'a, A, B> -where - A: 'static, - B: 'static, -{ - fn node<'b>( - &self, - bump: &'b bumpalo::Bump, - bus: &Bus<B>, - style_sheet: &mut Css<'b>, - ) -> dodrio::Node<'b> { - self.widget - .node(bump, &bus.map(self.mapper.clone()), style_sheet) - } -} |