-
Notifications
You must be signed in to change notification settings - Fork 1.5k
/
backend.rs
372 lines (305 loc) · 11.5 KB
/
backend.rs
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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
use crate::{glow_wrapping::WrappedGlowPainter, *};
use egui::TexturesDelta;
pub use egui::{pos2, Color32};
// ----------------------------------------------------------------------------
/// Data gathered between frames.
#[derive(Default)]
pub struct WebInput {
/// Required because we don't get a position on touched
pub latest_touch_pos: Option<egui::Pos2>,
/// Required to maintain a stable touch position for multi-touch gestures.
pub latest_touch_pos_id: Option<egui::TouchId>,
pub raw: egui::RawInput,
}
impl WebInput {
pub fn new_frame(&mut self, canvas_size: egui::Vec2) -> egui::RawInput {
egui::RawInput {
screen_rect: Some(egui::Rect::from_min_size(Default::default(), canvas_size)),
pixels_per_point: Some(native_pixels_per_point()), // We ALWAYS use the native pixels-per-point
time: Some(now_sec()),
..self.raw.take()
}
}
}
// ----------------------------------------------------------------------------
use std::sync::atomic::Ordering::SeqCst;
pub struct NeedRepaint(std::sync::atomic::AtomicBool);
impl Default for NeedRepaint {
fn default() -> Self {
Self(true.into())
}
}
impl NeedRepaint {
pub fn fetch_and_clear(&self) -> bool {
self.0.swap(false, SeqCst)
}
pub fn set_true(&self) {
self.0.store(true, SeqCst);
}
}
// ----------------------------------------------------------------------------
fn web_location() -> epi::Location {
let location = web_sys::window().unwrap().location();
let hash = percent_decode(&location.hash().unwrap_or_default());
let query = location
.search()
.unwrap_or_default()
.strip_prefix('?')
.map(percent_decode)
.unwrap_or_default();
let query_map = parse_query_map(&query)
.iter()
.map(|(k, v)| (k.to_string(), v.to_string()))
.collect();
epi::Location {
url: percent_decode(&location.href().unwrap_or_default()),
protocol: percent_decode(&location.protocol().unwrap_or_default()),
host: percent_decode(&location.host().unwrap_or_default()),
hostname: percent_decode(&location.hostname().unwrap_or_default()),
port: percent_decode(&location.port().unwrap_or_default()),
hash,
query,
query_map,
origin: percent_decode(&location.origin().unwrap_or_default()),
}
}
fn parse_query_map(query: &str) -> BTreeMap<&str, &str> {
query
.split('&')
.filter_map(|pair| {
if pair.is_empty() {
None
} else {
Some(if let Some((key, value)) = pair.split_once('=') {
(key, value)
} else {
(pair, "")
})
}
})
.collect()
}
#[test]
fn test_parse_query() {
assert_eq!(parse_query_map(""), BTreeMap::default());
assert_eq!(parse_query_map("foo"), BTreeMap::from_iter([("foo", "")]));
assert_eq!(
parse_query_map("foo=bar"),
BTreeMap::from_iter([("foo", "bar")])
);
assert_eq!(
parse_query_map("foo=bar&baz=42"),
BTreeMap::from_iter([("foo", "bar"), ("baz", "42")])
);
assert_eq!(
parse_query_map("foo&baz=42"),
BTreeMap::from_iter([("foo", ""), ("baz", "42")])
);
assert_eq!(
parse_query_map("foo&baz&&"),
BTreeMap::from_iter([("foo", ""), ("baz", "")])
);
}
// ----------------------------------------------------------------------------
pub struct AppRunner {
pub(crate) frame: epi::Frame,
egui_ctx: egui::Context,
painter: WrappedGlowPainter,
pub(crate) input: WebInput,
app: Box<dyn epi::App>,
pub(crate) needs_repaint: std::sync::Arc<NeedRepaint>,
storage: LocalStorage,
last_save_time: f64,
screen_reader: crate::screen_reader::ScreenReader,
pub(crate) text_cursor_pos: Option<egui::Pos2>,
pub(crate) mutable_text_under_cursor: bool,
textures_delta: TexturesDelta,
}
impl AppRunner {
pub fn new(canvas_id: &str, app: Box<dyn epi::App>) -> Result<Self, JsValue> {
let painter = WrappedGlowPainter::new(canvas_id).map_err(JsValue::from)?;
let prefer_dark_mode = crate::prefer_dark_mode();
let frame = epi::Frame::new(epi::backend::FrameData {
info: epi::IntegrationInfo {
name: "egui_web",
web_info: Some(epi::WebInfo {
location: web_location(),
}),
prefer_dark_mode,
cpu_usage: None,
native_pixels_per_point: Some(native_pixels_per_point()),
},
output: Default::default(),
});
let needs_repaint: std::sync::Arc<NeedRepaint> = Default::default();
let egui_ctx = egui::Context::default();
{
let needs_repaint = needs_repaint.clone();
egui_ctx.set_request_repaint_callback(move || {
needs_repaint.0.store(true, SeqCst);
});
}
load_memory(&egui_ctx);
if prefer_dark_mode == Some(true) {
egui_ctx.set_visuals(egui::Visuals::dark());
} else {
egui_ctx.set_visuals(egui::Visuals::light());
}
let storage = LocalStorage::default();
let mut runner = Self {
frame,
egui_ctx,
painter,
input: Default::default(),
app,
needs_repaint,
storage,
last_save_time: now_sec(),
screen_reader: Default::default(),
text_cursor_pos: None,
mutable_text_under_cursor: false,
textures_delta: Default::default(),
};
runner.input.raw.max_texture_side = Some(runner.painter.max_texture_side());
let gl = runner.painter.painter.gl();
runner
.app
.setup(&runner.egui_ctx, &runner.frame, Some(&runner.storage), gl);
Ok(runner)
}
pub fn egui_ctx(&self) -> &egui::Context {
&self.egui_ctx
}
pub fn auto_save(&mut self) {
let now = now_sec();
let time_since_last_save = now - self.last_save_time;
if time_since_last_save > self.app.auto_save_interval().as_secs_f64() {
if self.app.persist_egui_memory() {
save_memory(&self.egui_ctx);
}
self.app.save(&mut self.storage);
self.last_save_time = now;
}
}
pub fn canvas_id(&self) -> &str {
self.painter.canvas_id()
}
pub fn warm_up(&mut self) -> Result<(), JsValue> {
if self.app.warm_up_enabled() {
let saved_memory: egui::Memory = self.egui_ctx.memory().clone();
self.egui_ctx.memory().set_everything_is_visible(true);
self.logic()?;
*self.egui_ctx.memory() = saved_memory; // We don't want to remember that windows were huge.
self.egui_ctx.clear_animations();
}
Ok(())
}
/// Returns `true` if egui requests a repaint.
///
/// Call [`Self::paint`] later to paint
pub fn logic(&mut self) -> Result<(bool, Vec<egui::ClippedPrimitive>), JsValue> {
let frame_start = now_sec();
resize_canvas_to_screen_size(self.canvas_id(), self.app.max_size_points());
let canvas_size = canvas_size_in_points(self.canvas_id());
let raw_input = self.input.new_frame(canvas_size);
let full_output = self.egui_ctx.run(raw_input, |egui_ctx| {
self.app.update(egui_ctx, &self.frame);
});
let egui::FullOutput {
platform_output,
needs_repaint,
textures_delta,
shapes,
} = full_output;
self.handle_platform_output(platform_output);
self.textures_delta.append(textures_delta);
let clipped_primitives = self.egui_ctx.tessellate(shapes);
{
let app_output = self.frame.take_app_output();
let epi::backend::AppOutput {
quit: _, // Can't quit a web page
window_size: _, // Can't resize a web page
window_title: _, // TODO: change title of window
decorated: _, // Can't toggle decorations
drag_window: _, // Can't be dragged
} = app_output;
}
self.frame.lock().info.cpu_usage = Some((now_sec() - frame_start) as f32);
Ok((needs_repaint, clipped_primitives))
}
/// Paint the results of the last call to [`Self::logic`].
pub fn paint(&mut self, clipped_primitives: &[egui::ClippedPrimitive]) -> Result<(), JsValue> {
let textures_delta = std::mem::take(&mut self.textures_delta);
self.painter.clear(self.app.clear_color());
self.painter.paint_and_update_textures(
clipped_primitives,
self.egui_ctx.pixels_per_point(),
&textures_delta,
)?;
Ok(())
}
fn handle_platform_output(&mut self, platform_output: egui::PlatformOutput) {
if self.egui_ctx.options().screen_reader {
self.screen_reader
.speak(&platform_output.events_description());
}
let egui::PlatformOutput {
cursor_icon,
open_url,
copied_text,
events: _, // already handled
mutable_text_under_cursor,
text_cursor_pos,
} = platform_output;
set_cursor_icon(cursor_icon);
if let Some(open) = open_url {
crate::open_url(&open.url, open.new_tab);
}
#[cfg(web_sys_unstable_apis)]
if !copied_text.is_empty() {
set_clipboard_text(&copied_text);
}
#[cfg(not(web_sys_unstable_apis))]
let _ = copied_text;
self.mutable_text_under_cursor = mutable_text_under_cursor;
if self.text_cursor_pos != text_cursor_pos {
text_agent::move_text_cursor(text_cursor_pos, self.canvas_id());
self.text_cursor_pos = text_cursor_pos;
}
}
}
/// Install event listeners to register different input events
/// and start running the given app.
pub fn start(canvas_id: &str, app: Box<dyn epi::App>) -> Result<AppRunnerRef, JsValue> {
let mut runner = AppRunner::new(canvas_id, app)?;
runner.warm_up()?;
start_runner(runner)
}
/// Install event listeners to register different input events
/// and starts running the given `AppRunner`.
fn start_runner(app_runner: AppRunner) -> Result<AppRunnerRef, JsValue> {
let runner_container = AppRunnerContainer {
runner: Arc::new(Mutex::new(app_runner)),
panicked: Arc::new(AtomicBool::new(false)),
};
install_canvas_events(&runner_container)?;
install_document_events(&runner_container)?;
text_agent::install_text_agent(&runner_container)?;
repaint_every_ms(&runner_container, 1000)?; // just in case. TODO: make it a parameter
paint_and_schedule(&runner_container.runner, runner_container.panicked.clone())?;
// Disable all event handlers on panic
std::panic::set_hook(Box::new({
let previous_hook = std::panic::take_hook();
let panicked = runner_container.panicked;
move |panic_info| {
tracing::info_span!("egui_panic_handler").in_scope(|| {
tracing::trace!("setting panicked flag");
panicked.store(true, SeqCst);
tracing::info!("egui disabled all event handlers due to panic");
});
// Propagate panic info to the previously registered panic hook
previous_hook(panic_info);
}
}));
Ok(runner_container.runner)
}