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|
pub use crate::Overlay;
use crate::event::{self, Event};
use crate::layout;
use crate::mouse;
use crate::renderer;
use crate::{Clipboard, Hasher, Layout, Point, Rectangle, Shell, Size, Vector};
/// A generic [`Overlay`].
#[allow(missing_debug_implementations)]
pub struct Element<'a, Message, Renderer> {
position: Point,
overlay: Box<dyn Overlay<Message, Renderer> + 'a>,
}
impl<'a, Message, Renderer> Element<'a, Message, Renderer>
where
Renderer: crate::Renderer,
{
/// Creates a new [`Element`] containing the given [`Overlay`].
pub fn new(
position: Point,
overlay: Box<dyn Overlay<Message, Renderer> + 'a>,
) -> Self {
Self { position, overlay }
}
/// Returns the position of the [`Element`].
pub fn position(&self) -> Point {
self.position
}
/// Translates the [`Element`].
pub fn translate(mut self, translation: Vector) -> Self {
self.position = self.position + translation;
self
}
/// Applies a transformation to the produced message of the [`Element`].
pub fn map<B>(self, f: &'a dyn Fn(Message) -> B) -> Element<'a, B, Renderer>
where
Message: 'a,
Renderer: 'a,
B: 'static,
{
Element {
position: self.position,
overlay: Box::new(Map::new(self.overlay, f)),
}
}
/// Computes the layout of the [`Element`] in the given bounds.
pub fn layout(&self, renderer: &Renderer, bounds: Size) -> layout::Node {
self.overlay.layout(renderer, bounds, self.position)
}
/// Processes a runtime [`Event`].
pub fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
renderer: &Renderer,
clipboard: &mut dyn Clipboard,
shell: &mut Shell<'_, Message>,
) -> event::Status {
self.overlay.on_event(
event,
layout,
cursor_position,
renderer,
clipboard,
shell,
)
}
/// Returns the current [`mouse::Interaction`] of the [`Element`].
pub fn mouse_interaction(
&self,
layout: Layout<'_>,
cursor_position: Point,
viewport: &Rectangle,
) -> mouse::Interaction {
self.overlay
.mouse_interaction(layout, cursor_position, viewport)
}
/// Draws the [`Element`] and its children using the given [`Layout`].
pub fn draw(
&self,
renderer: &mut Renderer,
style: &renderer::Style,
layout: Layout<'_>,
cursor_position: Point,
) {
self.overlay.draw(renderer, style, layout, cursor_position)
}
/// Computes the _layout_ hash of the [`Element`].
pub fn hash_layout(&self, state: &mut Hasher) {
self.overlay.hash_layout(state, self.position);
}
}
struct Map<'a, A, B, Renderer> {
content: Box<dyn Overlay<A, Renderer> + 'a>,
mapper: &'a dyn Fn(A) -> B,
}
impl<'a, A, B, Renderer> Map<'a, A, B, Renderer> {
pub fn new(
content: Box<dyn Overlay<A, Renderer> + 'a>,
mapper: &'a dyn Fn(A) -> B,
) -> Map<'a, A, B, Renderer> {
Map { content, mapper }
}
}
impl<'a, A, B, Renderer> Overlay<B, Renderer> for Map<'a, A, B, Renderer>
where
Renderer: crate::Renderer,
{
fn layout(
&self,
renderer: &Renderer,
bounds: Size,
position: Point,
) -> layout::Node {
self.content.layout(renderer, bounds, position)
}
fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
renderer: &Renderer,
clipboard: &mut dyn Clipboard,
shell: &mut Shell<'_, B>,
) -> event::Status {
let mut local_messages = Vec::new();
let mut local_shell = Shell::new(&mut local_messages);
let event_status = self.content.on_event(
event,
layout,
cursor_position,
renderer,
clipboard,
&mut local_shell,
);
shell.merge(local_shell, self.mapper);
event_status
}
fn mouse_interaction(
&self,
layout: Layout<'_>,
cursor_position: Point,
viewport: &Rectangle,
) -> mouse::Interaction {
self.content
.mouse_interaction(layout, cursor_position, viewport)
}
fn draw(
&self,
renderer: &mut Renderer,
style: &renderer::Style,
layout: Layout<'_>,
cursor_position: Point,
) {
self.content.draw(renderer, style, layout, cursor_position)
}
fn hash_layout(&self, state: &mut Hasher, position: Point) {
self.content.hash_layout(state, position);
}
}
|
