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|
use crate::{
layout, Clipboard, Event, Hasher, Layer, Layout, Point, Size, Vector,
};
use std::rc::Rc;
#[allow(missing_debug_implementations)]
pub struct Overlay<'a, Message, Renderer> {
position: Point,
layer: Box<dyn Layer<Message, Renderer> + 'a>,
}
impl<'a, Message, Renderer> Overlay<'a, Message, Renderer>
where
Renderer: crate::Renderer,
{
pub fn new(
position: Point,
layer: Box<dyn Layer<Message, Renderer> + 'a>,
) -> Self {
Self { position, layer }
}
pub fn translate(mut self, translation: Vector) -> Self {
self.position = self.position + translation;
self
}
pub fn map<B>(self, f: Rc<dyn Fn(Message) -> B>) -> Overlay<'a, B, Renderer>
where
Message: 'static,
Renderer: 'a,
B: 'static,
{
Overlay {
position: self.position,
layer: Box::new(Map::new(self.layer, f)),
}
}
pub fn layout(&self, renderer: &Renderer, bounds: Size) -> layout::Node {
self.layer.layout(renderer, bounds, self.position)
}
pub fn draw(
&self,
renderer: &mut Renderer,
defaults: &Renderer::Defaults,
layout: Layout<'_>,
cursor_position: Point,
) -> Renderer::Output {
self.layer.draw(renderer, defaults, layout, cursor_position)
}
pub fn hash_layout(&self, state: &mut Hasher) {
self.layer.hash_layout(state, self.position);
}
pub fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
messages: &mut Vec<Message>,
renderer: &Renderer,
clipboard: Option<&dyn Clipboard>,
) {
self.layer.on_event(
event,
layout,
cursor_position,
messages,
renderer,
clipboard,
)
}
}
struct Map<'a, A, B, Renderer> {
layer: Box<dyn Layer<A, Renderer> + 'a>,
mapper: Rc<dyn Fn(A) -> B>,
}
impl<'a, A, B, Renderer> Map<'a, A, B, Renderer> {
pub fn new(
layer: Box<dyn Layer<A, Renderer> + 'a>,
mapper: Rc<dyn Fn(A) -> B + 'static>,
) -> Map<'a, A, B, Renderer> {
Map { layer, mapper }
}
}
impl<'a, A, B, Renderer> Layer<B, Renderer> for Map<'a, A, B, Renderer>
where
Renderer: crate::Renderer,
{
fn layout(
&self,
renderer: &Renderer,
bounds: Size,
position: Point,
) -> layout::Node {
self.layer.layout(renderer, bounds, position)
}
fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
messages: &mut Vec<B>,
renderer: &Renderer,
clipboard: Option<&dyn Clipboard>,
) {
let mut original_messages = Vec::new();
self.layer.on_event(
event,
layout,
cursor_position,
&mut original_messages,
renderer,
clipboard,
);
original_messages
.drain(..)
.for_each(|message| messages.push((self.mapper)(message)));
}
fn draw(
&self,
renderer: &mut Renderer,
defaults: &Renderer::Defaults,
layout: Layout<'_>,
cursor_position: Point,
) -> Renderer::Output {
self.layer.draw(renderer, defaults, layout, cursor_position)
}
fn hash_layout(&self, state: &mut Hasher, position: Point) {
self.layer.hash_layout(state, position);
}
}
|
