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|
use crate::overlay;
use crate::widget::tree::{self, Tree};
use crate::widget::Widget;
use iced_native::event::{self, Event};
use iced_native::layout::{self, Layout};
use iced_native::mouse;
use iced_native::renderer;
use iced_native::{Clipboard, Length, Point, Rectangle, Shell};
pub struct Element<'a, Message, Renderer> {
widget: Box<dyn Widget<Message, Renderer> + 'a>,
}
impl<'a, Message, Renderer> Element<'a, Message, Renderer> {
pub fn new(widget: impl Widget<Message, Renderer> + 'a) -> Self {
Self {
widget: Box::new(widget),
}
}
pub fn as_widget(&self) -> &dyn Widget<Message, Renderer> {
self.widget.as_ref()
}
pub fn as_widget_mut(&mut self) -> &mut dyn Widget<Message, Renderer> {
self.widget.as_mut()
}
pub fn map<B>(
self,
f: impl Fn(Message) -> B + 'a,
) -> Element<'a, B, Renderer>
where
Message: 'a,
Renderer: iced_native::Renderer + 'a,
B: 'a,
{
Element::new(Map::new(self.widget, f))
}
}
struct Map<'a, A, B, Renderer> {
widget: Box<dyn Widget<A, Renderer> + 'a>,
mapper: Box<dyn Fn(A) -> B + 'a>,
}
impl<'a, A, B, Renderer> Map<'a, A, B, Renderer> {
pub fn new<F>(
widget: Box<dyn Widget<A, Renderer> + 'a>,
mapper: F,
) -> Map<'a, A, B, Renderer>
where
F: 'a + Fn(A) -> B,
{
Map {
widget,
mapper: Box::new(mapper),
}
}
}
impl<'a, A, B, Renderer> Widget<B, Renderer> for Map<'a, A, B, Renderer>
where
Renderer: iced_native::Renderer + 'a,
A: 'a,
B: 'a,
{
fn tag(&self) -> tree::Tag {
self.widget.tag()
}
fn state(&self) -> tree::State {
self.widget.state()
}
fn children(&self) -> Vec<Tree> {
self.widget.children()
}
fn diff(&self, tree: &mut Tree) {
self.widget.diff(tree)
}
fn width(&self) -> Length {
self.widget.width()
}
fn height(&self) -> Length {
self.widget.height()
}
fn layout(
&self,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
self.widget.layout(renderer, limits)
}
fn on_event(
&mut self,
tree: &mut Tree,
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 status = self.widget.on_event(
tree,
event,
layout,
cursor_position,
renderer,
clipboard,
&mut local_shell,
);
shell.merge(local_shell, &self.mapper);
status
}
fn draw(
&self,
tree: &Tree,
renderer: &mut Renderer,
style: &renderer::Style,
layout: Layout<'_>,
cursor_position: Point,
viewport: &Rectangle,
) {
self.widget.draw(
tree,
renderer,
style,
layout,
cursor_position,
viewport,
)
}
fn mouse_interaction(
&self,
tree: &Tree,
layout: Layout<'_>,
cursor_position: Point,
viewport: &Rectangle,
renderer: &Renderer,
) -> mouse::Interaction {
self.widget.mouse_interaction(
tree,
layout,
cursor_position,
viewport,
renderer,
)
}
fn overlay<'b>(
&'b self,
tree: &'b mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
) -> Option<overlay::Element<'b, B, Renderer>> {
let mapper = &self.mapper;
self.widget
.overlay(tree, layout, renderer)
.map(move |overlay| overlay.map(mapper))
}
}
|
