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use super::Chart;
use crate::renderer::Renderer;
use crate::utils::cursor_from_window_position;
use core::marker::PhantomData;
use iced_graphics::{renderer::Style, widget::canvas::Event};
use iced_native::widget::tree::{self, Tree};
use iced_native::{event, Clipboard, Font, Layout, Length, Point, Rectangle, Shell, Size};
use iced_native::{Element, Widget};
use plotters_backend::{FontFamily, FontStyle};
pub struct ChartWidget<'a, Message, Renderer, C>
where
C: Chart<Message>,
{
chart: C,
width: Length,
height: Length,
font_resolver: Box<dyn Fn(FontFamily, FontStyle) -> Font>,
_marker: PhantomData<&'a (Renderer, Message)>,
}
impl<'a, Message, Renderer, C> ChartWidget<'a, Message, Renderer, C>
where
C: Chart<Message> + 'a,
{
pub fn new(chart: C) -> Self {
Self {
chart,
width: Length::Fill,
height: Length::Fill,
font_resolver: Box::new(|_, _| Default::default()),
_marker: Default::default(),
}
}
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
pub fn height(mut self, height: Length) -> Self {
self.height = height;
self
}
pub fn resolve_font(
mut self,
resolver: impl Fn(FontFamily, FontStyle) -> Font + 'static,
) -> Self {
self.font_resolver = Box::new(resolver);
self
}
}
impl<'a, Message, Renderer, C> Widget<Message, Renderer> for ChartWidget<'a, Message, Renderer, C>
where
C: Chart<Message>,
Renderer: self::Renderer,
{
fn width(&self) -> Length {
self.width
}
fn height(&self) -> Length {
self.height
}
fn tag(&self) -> tree::Tag {
struct Tag<T>(T);
tree::Tag::of::<Tag<C::State>>()
}
fn state(&self) -> tree::State {
tree::State::new(C::State::default())
}
#[inline]
fn layout(
&self,
_renderer: &Renderer,
limits: &iced_native::layout::Limits,
) -> iced_native::layout::Node {
let size = limits
.width(self.width)
.height(self.height)
.resolve(Size::ZERO);
iced_native::layout::Node::new(size)
}
#[inline]
fn draw(
&self,
tree: &Tree,
renderer: &mut Renderer,
_theme: &<Renderer as iced_native::Renderer>::Theme,
_style: &Style,
layout: iced_native::Layout<'_>,
_cursor_position: Point,
_viewport: &Rectangle,
) {
let state = tree.state.downcast_ref::<C::State>();
renderer.draw_chart(state, &self.chart, &self.font_resolver, layout);
}
#[inline]
fn on_event(
&mut self,
tree: &mut Tree,
event: iced_native::Event,
layout: Layout<'_>,
cursor_position: Point,
_renderer: &Renderer,
_clipboard: &mut dyn Clipboard,
shell: &mut Shell<'_, Message>,
) -> event::Status {
let bounds = layout.bounds();
let canvas_event = match event {
iced_native::Event::Mouse(mouse_event) => Some(Event::Mouse(mouse_event)),
iced_native::Event::Keyboard(keyboard_event) => Some(Event::Keyboard(keyboard_event)),
_ => None,
};
let cursor = cursor_from_window_position(cursor_position);
if let Some(canvas_event) = canvas_event {
let state = tree.state.downcast_mut::<C::State>();
let (event_status, message) = self.chart.update(state, canvas_event, bounds, cursor);
if let Some(message) = message {
shell.publish(message);
}
return event_status;
}
event::Status::Ignored
}
fn mouse_interaction(
&self,
tree: &Tree,
layout: Layout<'_>,
cursor_position: Point,
_viewport: &Rectangle,
_renderer: &Renderer,
) -> iced_native::mouse::Interaction {
let state = tree.state.downcast_ref::<C::State>();
let bounds = layout.bounds();
let cursor = cursor_from_window_position(cursor_position);
self.chart.mouse_interaction(state, bounds, cursor)
}
}
impl<'a, Message, Renderer, C> From<ChartWidget<'a, Message, Renderer, C>>
for Element<'a, Message, Renderer>
where
Message: 'a,
C: Chart<Message> + 'a,
Renderer: self::Renderer,
{
fn from(widget: ChartWidget<'a, Message, Renderer, C>) -> Self {
Element::new(widget)
}
}