Echo Writes Code

html.rs

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use wasm_bindgen::prelude::{ * };

use crate::geometry::{ Vector2D };
use crate::window::{ Window, WindowBuilder };

use web_sys::{ HtmlElement };

use std::cell::{ OnceCell };

#[derive(Debug, Default)]
pub struct HtmlWindowBuilder<D> {
  delegate: OnceCell<D>,
  element: OnceCell<HtmlElement>,
}

impl<D: std::fmt::Debug> HtmlWindowBuilder<D> {
  pub fn new() -> HtmlWindowBuilder<D> {
    HtmlWindowBuilder {
      delegate: OnceCell::new(),
      element: OnceCell::new(),
    }
  }

  pub fn with_delegate(self, delegate: D) -> HtmlWindowBuilder<D> {
    self.delegate
      .set(delegate)
      .expect("Should have been able to set self.delegate");

    self
  }

  pub fn with_element(self, element: HtmlElement) -> HtmlWindowBuilder<D> {
    self.element
      .set(element)
      .expect("Should have been able to set self.element");

    self
  }

  pub fn with_id(self, id: &str) -> HtmlWindowBuilder<D> {
    let document = web_sys::window()
      .expect("Should have been able to get window object")
      .document()
      .expect("Should have been able to get document object");

    let element = document
      .get_element_by_id(id)
      .expect("Should have been able to get the element")
      .dyn_into::<HtmlElement>()
      .expect("Should have gotten an HTML element");

    self.with_element(element)
  }

  pub fn with_selector(self, selector: &str) -> HtmlWindowBuilder<D> {
    let document = web_sys::window()
      .expect("Should have been able to get window object")
      .document()
      .expect("Should have been able to get document object");

    let element = document
      .query_selector(selector)
      .expect("Should have been able to call document.querySelector()")
      .expect("Should have gotten an element")
      .dyn_into::<HtmlElement>()
      .expect("Should have gotten an HTML element");

    self.with_element(element)
  }
}

impl<D> WindowBuilder for HtmlWindowBuilder<D> {
  type Output = HtmlWindow<D>;

  fn build(mut self) -> HtmlWindow<D> {
    let delegate = self.delegate
      .take()
      .expect("Should have been given a delegate");

    let element = self.element
      .take()
      .expect("Should have been given an element");

    HtmlWindow {
      delegate,
      element,
    }
  }
}

#[derive(Debug)]
pub struct HtmlWindow<D> {
  delegate: D,
  element: HtmlElement,
}

impl<D> Window for HtmlWindow<D> {
  fn resolution(&self) -> Vector2D<u32> {
    let width = self.element.offset_width()
      .try_into()
      .expect("Element offsetWidth should never be negative");

    let height = self.element.offset_height()
      .try_into()
      .expect("Element offsetHeight should never be negative");

    Vector2D::new(width, height)
  }
}