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|
use crate::{
column, conversion, input::mouse, renderer::Windowed, Cache, Column,
Element, Event, Length, MouseCursor, UserInterface,
};
pub trait Application {
type Renderer: Windowed + column::Renderer;
type Message;
fn update(&mut self, message: Self::Message);
fn view(&mut self) -> Element<Self::Message, Self::Renderer>;
fn run(mut self)
where
Self: 'static + Sized,
{
use winit::{
event::{self, WindowEvent},
event_loop::{ControlFlow, EventLoop},
window::WindowBuilder,
};
let event_loop = EventLoop::new();
// TODO: Ask for window settings and configure this properly
let window = WindowBuilder::new()
.build(&event_loop)
.expect("Open window");
let mut size: Size = window
.inner_size()
.to_physical(window.hidpi_factor())
.into();
let mut new_size: Option<Size> = None;
let mut renderer = Self::Renderer::new(&window);
let mut target = renderer.target(size.width, size.height);
let user_interface = UserInterface::build(
document(&mut self, size),
Cache::default(),
&mut renderer,
);
let mut primitive = user_interface.draw(&mut renderer);
let mut cache = Some(user_interface.into_cache());
let mut events = Vec::new();
let mut mouse_cursor = MouseCursor::OutOfBounds;
window.request_redraw();
event_loop.run(move |event, _, control_flow| match event {
event::Event::MainEventsCleared => {
// TODO: We should be able to keep a user interface alive
// between events once we remove state references.
//
// This will allow us to rebuild it only when a message is
// handled.
let mut user_interface = UserInterface::build(
document(&mut self, size),
cache.take().unwrap(),
&mut renderer,
);
let messages = user_interface.update(events.drain(..));
if messages.is_empty() {
primitive = user_interface.draw(&mut renderer);
cache = Some(user_interface.into_cache());
} else {
// When there are messages, we are forced to rebuild twice
// for now :^)
let temp_cache = user_interface.into_cache();
for message in messages {
log::debug!("Updating");
self.update(message);
}
let user_interface = UserInterface::build(
document(&mut self, size),
temp_cache,
&mut renderer,
);
primitive = user_interface.draw(&mut renderer);
cache = Some(user_interface.into_cache());
}
window.request_redraw();
}
event::Event::RedrawRequested(_) => {
if let Some(new_size) = new_size.take() {
target = renderer.target(new_size.width, new_size.height);
size = new_size;
}
let new_mouse_cursor = renderer.draw(&primitive, &mut target);
if new_mouse_cursor != mouse_cursor {
window.set_cursor_icon(conversion::mouse_cursor(
new_mouse_cursor,
));
mouse_cursor = new_mouse_cursor;
}
// TODO: Handle animations!
// Maybe we can use `ControlFlow::WaitUntil` for this.
}
event::Event::WindowEvent {
event: window_event,
..
} => match window_event {
WindowEvent::CursorMoved { position, .. } => {
let physical_position =
position.to_physical(window.hidpi_factor());
events.push(Event::Mouse(mouse::Event::CursorMoved {
x: physical_position.x as f32,
y: physical_position.y as f32,
}));
}
WindowEvent::MouseInput { button, state, .. } => {
events.push(Event::Mouse(mouse::Event::Input {
button: conversion::mouse_button(button),
state: conversion::button_state(state),
}));
}
WindowEvent::CloseRequested => {
*control_flow = ControlFlow::Exit;
}
WindowEvent::Resized(size) => {
new_size =
Some(size.to_physical(window.hidpi_factor()).into());
log::debug!("Resized: {:?}", new_size);
}
_ => {}
},
_ => {
*control_flow = ControlFlow::Wait;
}
})
}
}
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
struct Size {
width: u16,
height: u16,
}
impl From<winit::dpi::PhysicalSize> for Size {
fn from(physical_size: winit::dpi::PhysicalSize) -> Self {
Self {
width: physical_size.width.round() as u16,
height: physical_size.height.round() as u16,
}
}
}
fn document<Application>(
application: &mut Application,
size: Size,
) -> Element<Application::Message, Application::Renderer>
where
Application: self::Application,
Application::Message: 'static,
{
Column::new()
.width(Length::Units(size.width))
.height(Length::Units(size.height))
.push(application.view())
.into()
}
|
