1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

use smithy_types::{
  AsInnerHtml,
  CollapsedNode,
  Component,
  Path,
  UiEvent,
  UnwrappedPromise,
  WindowEvent,
};
use web_sys::{
  Element,
  Window,
};
mod with_inner_value;
use self::with_inner_value::*;
use futures::Future;
use std::{
  cell::RefCell,
  mem::transmute,
};

mod attach_event_listeners;
mod js_fns;
mod node_diff;
mod zip_util;

use self::node_diff::{
  ApplicableTo,
  Diffable,
};

// TODO this should not be thread-local, but should be instantiated inside of
// mount(). This will *probably* require us to not call crate::rerender in some
// callbacks.
thread_local! {
  static ROOT_ELEMENT: RefCell<Option<Element>> = RefCell::new(None);
  static LAST_RENDERED_NODE: RefCell<Option<Vec<CollapsedNode>>> = RefCell::new(None);
  static ROOT_COMPONENT: RefCell<Option<Box<Component>>> = RefCell::new(None);
  static EVENT_DEPTH: RefCell<u32> = RefCell::new(0);
}

fn get_window() -> Window {
  web_sys::window().unwrap()
}

fn render_initially(component: &mut Box<Component>, el: &Element) {
  let node: Vec<CollapsedNode> = component.render().into();
  el.set_inner_html(&node.as_inner_html());
  LAST_RENDERED_NODE.store(node);
}

fn with_increased_event_depth<T>(f: impl Fn() -> T) -> T {
  EVENT_DEPTH.with(|depth| {
    let existing_depth = *depth.borrow();
    *depth.borrow_mut() = existing_depth + 1;
  });
  let ret = f();
  EVENT_DEPTH.with(|depth| {
    let existing_depth = *depth.borrow();
    *depth.borrow_mut() = existing_depth - 1;
  });
  ret
}

fn get_event_depth() -> u32 {
  EVENT_DEPTH.with(|depth| *depth.borrow())
}

fn event_handling_phase_is_ongoing() -> bool {
  get_event_depth() > 0
}

fn handle_window_event(w: &WindowEvent) -> bool {
  with_increased_event_depth(|| {
    ROOT_COMPONENT.with_inner_value(|root_component| root_component.handle_window_event(w))
  })
}

fn handle_ui_event(ui_event: &UiEvent, path: &Path) -> bool {
  with_increased_event_depth(|| {
    ROOT_COMPONENT
      .with_inner_value(|root_component| root_component.handle_ui_event(ui_event, &path))
  })
}

fn attach_listeners(el: &Element) {
  let html_el = unsafe { transmute::<&Element, &js_fns::HTMLElement>(el) };
  attach_event_listeners::attach_ui_event_listeners(&html_el);

  let window = get_window();
  let window = unsafe { transmute::<Window, js_fns::WINDOW>(window) };
  attach_event_listeners::attach_window_event_listeners(&window);
}

/// Forces the currently mounted smithy app to re-render.
pub fn rerender() {
  ROOT_COMPONENT.with_inner_value(|root_component| {
    let newly_rendered_nodes: Vec<CollapsedNode> = root_component.render().into();

    LAST_RENDERED_NODE.with_inner_value(|last_rendered_node| {
      let diff = last_rendered_node.get_diff_with(&newly_rendered_nodes);
      #[cfg(feature = "browser-logs")]
      web_sys::console::log_1(&wasm_bindgen::JsValue::from_str(&format!(
        "\n\n\nrerender\n------------------------\n\nfrom {:?}\n\nto {:?}\n\ndiff {:#?}\n\n",
        last_rendered_node.as_inner_html(),
        newly_rendered_nodes.as_inner_html(),
        diff
      )));
      ROOT_ELEMENT.with_inner_value(|el| {
        #[cfg(feature = "browser-logs")]
        web_sys::console::log_1(&wasm_bindgen::JsValue::from_str(&format!(
          "\n\nroot el inner {:?}",
          el.inner_html()
        )));
        for diff_item in diff.iter() {
          diff_item.apply_to(el);
        }
      });
    });

    root_component.handle_ref_assignment(vec![]);
    root_component.handle_post_render();
    LAST_RENDERED_NODE.store(newly_rendered_nodes);
  });
}

/// Mounts the smithy app at the specified element.
///
/// # Examples
///
/// ```rs
/// let app = smd!(<div>hello world</div>);
/// let el_opt = web_sys::window()
///   .and_then(|w| w.document())
///   .query_selector("#app");
/// if let Some(el) = el_opt {
///   smithy::mount(app, el);
/// }
/// ```
pub fn mount(mut component: Box<Component>, el: Element) {
  console_error_panic_hook::set_once();
  render_initially(&mut component, &el);
  attach_listeners(&el);
  ROOT_ELEMENT.store(el);
  component.handle_ref_assignment(vec![]);
  component.handle_post_render();
  ROOT_COMPONENT.store(component);
}

/// Converts a future into an `UnwrappedPromise`, which causes the
/// app to re-render when the future succeeds or fails.
pub fn unwrapped_promise_from_future<S: 'static, E: 'static>(
  future: impl Future<Item = S, Error = E> + 'static,
) -> UnwrappedPromise<S, E> {
  UnwrappedPromise::new(future, Some(rerender))
}