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
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
use std::collections::hash_map::DefaultHasher;
use std::fmt::Write;
use std::hash::Hasher;

use geom::{PolyLine, Polygon};

use crate::assets::Assets;
use crate::{
    svg, Color, DeferDraw, EventCtx, GeomBatch, JustDraw, MultiKey, ScreenDims, Style, Widget,
};

// Same as body()
pub const DEFAULT_FONT: Font = Font::OverpassRegular;
pub const DEFAULT_FONT_SIZE: usize = 21;

pub const BG_COLOR: Color = Color::grey(0.3);
pub const SELECTED_COLOR: Color = Color::grey(0.5);
pub const SCALE_LINE_HEIGHT: f64 = 1.2;

// TODO Almost gone!
pub const MAX_CHAR_WIDTH: f64 = 25.0;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum Font {
    BungeeInlineRegular,
    BungeeRegular,
    OverpassBold,
    OverpassRegular,
    OverpassSemiBold,
    OverpassMonoBold,
}

impl Font {
    pub fn family(self) -> &'static str {
        match self {
            Font::BungeeInlineRegular => "Bungee Inline",
            Font::BungeeRegular => "Bungee",
            Font::OverpassBold => "Overpass",
            Font::OverpassRegular => "Overpass",
            Font::OverpassSemiBold => "Overpass",
            Font::OverpassMonoBold => "Overpass Mono",
        }
    }
}

#[derive(Debug, Clone)]
pub struct TextSpan {
    text: String,
    fg_color: Option<Color>,
    size: usize,
    font: Font,
    underlined: bool,
}

impl TextSpan {
    pub fn fg(mut self, color: Color) -> TextSpan {
        assert_eq!(self.fg_color, None);
        self.fg_color = Some(color);
        self
    }

    pub fn maybe_fg(mut self, color: Option<Color>) -> TextSpan {
        assert_eq!(self.fg_color, None);
        self.fg_color = color;
        self
    }

    pub fn fg_color_for_style(&self, style: &Style) -> Color {
        self.fg_color.unwrap_or(style.text_fg_color)
    }

    pub fn draw(self, ctx: &EventCtx) -> Widget {
        Text::from(self).draw(ctx)
    }
    pub fn batch(self, ctx: &EventCtx) -> Widget {
        Text::from(self).batch(ctx)
    }

    // Yuwen's new styles, defined in Figma. Should document them in Github better.

    pub fn display_title(mut self) -> TextSpan {
        self.font = Font::BungeeInlineRegular;
        self.size = 64;
        self
    }
    pub fn big_heading_styled(mut self) -> TextSpan {
        self.font = Font::BungeeRegular;
        self.size = 32;
        self
    }
    pub fn big_heading_plain(mut self) -> TextSpan {
        self.font = Font::OverpassBold;
        self.size = 32;
        self
    }
    pub fn small_heading(mut self) -> TextSpan {
        self.font = Font::OverpassSemiBold;
        self.size = 26;
        self
    }
    // The default
    pub fn body(mut self) -> TextSpan {
        self.font = Font::OverpassRegular;
        self.size = 21;
        self
    }
    pub fn bold_body(mut self) -> TextSpan {
        self.font = Font::OverpassBold;
        self.size = 21;
        self
    }
    pub fn secondary(mut self) -> TextSpan {
        self.font = Font::OverpassRegular;
        self.size = 21;
        // TODO This should be per-theme
        self.fg_color = Some(Color::hex("#A3A3A3"));
        self
    }
    pub fn small(mut self) -> TextSpan {
        self.font = Font::OverpassRegular;
        self.size = 16;
        self
    }
    pub fn big_monospaced(mut self) -> TextSpan {
        self.font = Font::OverpassMonoBold;
        self.size = 32;
        self
    }
    pub fn small_monospaced(mut self) -> TextSpan {
        self.font = Font::OverpassMonoBold;
        self.size = 16;
        self
    }

    pub fn underlined(mut self) -> TextSpan {
        self.underlined = true;
        self
    }

    pub fn size(mut self, size: usize) -> TextSpan {
        self.size = size;
        self
    }

    pub fn font(mut self, font: Font) -> TextSpan {
        self.font = font;
        self
    }
}

// TODO What's the better way of doing this? Also "Line" is a bit of a misnomer
#[allow(non_snake_case)]
pub fn Line<S: Into<String>>(text: S) -> TextSpan {
    TextSpan {
        text: text.into(),
        fg_color: None,
        size: DEFAULT_FONT_SIZE,
        font: DEFAULT_FONT,
        underlined: false,
    }
}

#[derive(Debug, Clone)]
pub struct Text {
    // The bg_color will cover the entire block, but some lines can have extra highlighting.
    lines: Vec<(Option<Color>, Vec<TextSpan>)>,
    // TODO Stop using this as much as possible.
    bg_color: Option<Color>,
}

impl Text {
    pub fn new() -> Text {
        Text {
            lines: Vec::new(),
            bg_color: None,
        }
    }

    pub fn from(line: TextSpan) -> Text {
        let mut txt = Text::new();
        txt.add(line);
        txt
    }

    pub fn from_all(lines: Vec<TextSpan>) -> Text {
        let mut txt = Text::new();
        for l in lines {
            txt.append(l);
        }
        txt
    }

    pub fn from_multiline(lines: Vec<TextSpan>) -> Text {
        let mut txt = Text::new();
        for l in lines {
            txt.add(l);
        }
        txt
    }

    // TODO Remove this
    pub fn with_bg(mut self) -> Text {
        assert!(self.bg_color.is_none());
        self.bg_color = Some(BG_COLOR);
        self
    }

    pub fn bg(mut self, bg: Color) -> Text {
        assert!(self.bg_color.is_none());
        self.bg_color = Some(bg);
        self
    }

    // TODO Not exactly sure this is the right place for this, but better than code duplication
    pub fn tooltip<MK: Into<Option<MultiKey>>>(ctx: &EventCtx, hotkey: MK, action: &str) -> Text {
        if let Some(ref key) = hotkey.into() {
            Text::from_all(vec![
                Line(key.describe())
                    .fg(ctx.style().text_hotkey_color)
                    .small(),
                Line(format!(" - {}", action)).small(),
            ])
        } else {
            Text::from(Line(action).small())
        }
    }

    pub fn change_fg(mut self, fg: Color) -> Text {
        for (_, spans) in self.lines.iter_mut() {
            for span in spans {
                span.fg_color = Some(fg);
            }
        }
        self
    }

    pub fn default_fg(mut self, fg: Color) -> Text {
        for (_, spans) in self.lines.iter_mut() {
            for span in spans {
                if span.fg_color.is_none() {
                    span.fg_color = Some(fg);
                }
            }
        }
        self
    }

    pub fn add(&mut self, line: TextSpan) {
        self.lines.push((None, vec![line]));
    }

    pub fn add_highlighted(&mut self, line: TextSpan, highlight: Color) {
        self.lines.push((Some(highlight), vec![line]));
    }

    // TODO Just one user...
    pub(crate) fn highlight_last_line(&mut self, highlight: Color) {
        self.lines.last_mut().unwrap().0 = Some(highlight);
    }

    pub fn append(&mut self, line: TextSpan) {
        if self.lines.is_empty() {
            self.add(line);
            return;
        }

        self.lines.last_mut().unwrap().1.push(line);
    }

    pub fn add_appended(&mut self, lines: Vec<TextSpan>) {
        for (idx, l) in lines.into_iter().enumerate() {
            if idx == 0 {
                self.add(l);
            } else {
                self.append(l);
            }
        }
    }

    pub fn append_all(&mut self, lines: Vec<TextSpan>) {
        for l in lines {
            self.append(l);
        }
    }

    pub fn is_empty(&self) -> bool {
        self.lines.is_empty()
    }

    pub fn extend(&mut self, other: Text) {
        self.lines.extend(other.lines);
    }

    pub(crate) fn dims(self, assets: &Assets) -> ScreenDims {
        self.render(assets).get_dims()
    }

    /// Render the text, without any autocropping. You can pass in an `EventCtx` or `GfxCtx`.
    pub fn render<A: AsRef<Assets>>(self, assets: &A) -> GeomBatch {
        let assets: &Assets = assets.as_ref();
        self.inner_render(assets, svg::HIGH_QUALITY)
    }

    pub(crate) fn inner_render(self, assets: &Assets, tolerance: f32) -> GeomBatch {
        let hash_key = self.hash_key();
        if let Some(batch) = assets.get_cached_text(&hash_key) {
            return batch;
        }

        let mut output_batch = GeomBatch::new();
        let mut master_batch = GeomBatch::new();

        let mut y = 0.0;
        let mut max_width = 0.0_f64;
        // TODO Can we make usvg do the work of layouting multiple lines too?
        // https://www.oreilly.com/library/view/svg-text-layout/9781491933817/ch04.html
        for (line_color, line) in self.lines {
            // In case size changes mid-line, take the max of every span.
            // (f64 isn't Ord, so no max(), so do this manually.)
            let mut line_height = 0.0_f64;
            for span in &line {
                line_height = line_height.max(assets.line_height(span.font, span.size));
            }

            let line_batch = render_line(line, tolerance, assets);
            let line_dims = if line_batch.is_empty() {
                ScreenDims::new(0.0, line_height)
            } else {
                // Also lie a little about width to make things look reasonable. TODO Probably
                // should tune based on font size.
                ScreenDims::new(line_batch.get_dims().width + 5.0, line_height)
            };

            if let Some(c) = line_color {
                master_batch.push(
                    c,
                    Polygon::rectangle(line_dims.width, line_dims.height).translate(0.0, y),
                );
            }

            y += line_dims.height;

            // Add all of the padding at the bottom of the line.
            let offset = line_height / SCALE_LINE_HEIGHT * 0.2;
            master_batch.append(line_batch.translate(0.0, y - offset));

            max_width = max_width.max(line_dims.width);
        }

        if let Some(c) = self.bg_color {
            output_batch.push(c, Polygon::rectangle(max_width, y));
        }
        output_batch.append(master_batch);
        output_batch.autocrop_dims = false;

        assets.cache_text(hash_key, output_batch.clone());
        output_batch
    }

    /// Render the text, autocropping blank space out of the result. You can pass in an `EventCtx`
    /// or `GfxCtx`.
    pub fn render_autocropped<A: AsRef<Assets>>(self, assets: &A) -> GeomBatch {
        let mut batch = self.render(assets);
        batch.autocrop_dims = true;
        batch.autocrop()
    }

    fn hash_key(&self) -> String {
        let mut hasher = DefaultHasher::new();
        hasher.write(format!("{:?}", self).as_ref());
        format!("{:x}", hasher.finish())
    }

    pub fn draw(self, ctx: &EventCtx) -> Widget {
        JustDraw::wrap(ctx, self.render(ctx))
    }
    pub fn batch(self, ctx: &EventCtx) -> Widget {
        DeferDraw::new(self.render(ctx))
    }

    pub fn wrap_to_pct(self, ctx: &EventCtx, pct: usize) -> Text {
        self.inner_wrap_to_pct(
            (pct as f64) / 100.0 * ctx.canvas.window_width,
            &ctx.prerender.assets,
        )
    }

    pub(crate) fn inner_wrap_to_pct(mut self, limit: f64, assets: &Assets) -> Text {
        let mut lines = Vec::new();
        for (bg, spans) in self.lines.drain(..) {
            // First optimistically assume everything just fits.
            if render_line(spans.clone(), svg::LOW_QUALITY, assets)
                .get_dims()
                .width
                < limit
            {
                lines.push((bg, spans));
                continue;
            }

            // Greedy approach, fit as many words on a line as possible. Don't do all of that
            // hyphenation nonsense.
            let mut width_left = limit;
            let mut current_line = Vec::new();
            for span in spans {
                let mut current_span = span.clone();
                current_span.text = String::new();
                for word in span.text.split_whitespace() {
                    let width = render_line(
                        vec![TextSpan {
                            text: word.to_string(),
                            size: span.size,
                            font: span.font,
                            fg_color: span.fg_color,
                            underlined: false,
                        }],
                        svg::LOW_QUALITY,
                        assets,
                    )
                    .get_dims()
                    .width;
                    if width_left > width {
                        current_span.text.push(' ');
                        current_span.text.push_str(word);
                        width_left -= width;
                    } else {
                        current_line.push(current_span);
                        lines.push((bg, current_line.drain(..).collect()));

                        current_span = span.clone();
                        current_span.text = word.to_string();
                        width_left = limit;
                    }
                }
                if !current_span.text.is_empty() {
                    current_line.push(current_span);
                }
            }
            if !current_line.is_empty() {
                lines.push((bg, current_line));
            }
        }
        self.lines = lines;
        self
    }
}

fn render_line(spans: Vec<TextSpan>, tolerance: f32, assets: &Assets) -> GeomBatch {
    // Just set a sufficiently large view box
    let mut svg = r##"<svg width="9999" height="9999" viewBox="0 0 9999 9999" xmlns="http://www.w3.org/2000/svg">"##.to_string();

    write!(&mut svg, r##"<text x="0" y="0" xml:space="preserve">"##,).unwrap();

    let mut contents = String::new();
    for span in spans {
        let fg_color = span.fg_color_for_style(&assets.style.borrow());
        write!(
            &mut contents,
            r##"<tspan font-size="{}" font-family="{}" {} fill="{}" fill-opacity="{}" {}>{}</tspan>"##,
            span.size,
            span.font.family(),
            match span.font {
                Font::OverpassBold => "font-weight=\"bold\"",
                Font::OverpassSemiBold => "font-weight=\"600\"",
                _ => "",
            },
            fg_color.to_hex(),
            fg_color.a,
            if span.underlined {
                "text-decoration=\"underline\""
            } else {
                ""
            },
            htmlescape::encode_minimal(&span.text)
        )
        .unwrap();
    }
    write!(&mut svg, "{}</text></svg>", contents).unwrap();

    let svg_tree = match usvg::Tree::from_str(&svg, &assets.text_opts) {
        Ok(t) => t,
        Err(err) => panic!("render_line({}): {}", contents, err),
    };
    let mut batch = GeomBatch::new();
    match crate::svg::add_svg_inner(&mut batch, svg_tree, tolerance) {
        Ok(_) => batch,
        Err(err) => panic!("render_line({}): {}", contents, err),
    }
}

pub trait TextExt {
    fn draw_text(self, ctx: &EventCtx) -> Widget;
    fn batch_text(self, ctx: &EventCtx) -> Widget;
}

impl TextExt for &str {
    fn draw_text(self, ctx: &EventCtx) -> Widget {
        Line(self).draw(ctx)
    }
    fn batch_text(self, ctx: &EventCtx) -> Widget {
        Line(self).batch(ctx)
    }
}

impl TextExt for String {
    fn draw_text(self, ctx: &EventCtx) -> Widget {
        Line(self).draw(ctx)
    }
    fn batch_text(self, ctx: &EventCtx) -> Widget {
        Line(self).batch(ctx)
    }
}

impl TextSpan {
    // TODO Copies from render_line a fair amount
    pub fn render_curvey<A: AsRef<Assets>>(
        self,
        assets: &A,
        path: &PolyLine,
        scale: f64,
    ) -> GeomBatch {
        let assets = assets.as_ref();
        let tolerance = svg::HIGH_QUALITY;

        // Just set a sufficiently large view box
        let mut svg = r##"<svg width="9999" height="9999" viewBox="0 0 9999 9999" xmlns="http://www.w3.org/2000/svg">"##.to_string();

        write!(
            &mut svg,
            r##"<path id="txtpath" fill="none" stroke="none" d=""##
        )
        .unwrap();
        write!(
            &mut svg,
            "M {} {}",
            path.points()[0].x(),
            path.points()[0].y()
        )
        .unwrap();
        for pt in path.points().into_iter().skip(1) {
            write!(&mut svg, " L {} {}", pt.x(), pt.y()).unwrap();
        }
        write!(&mut svg, "\" />").unwrap();
        // We need to subtract and account for the length of the text
        let start_offset = (path.length() / 2.0).inner_meters()
            - (Text::from(Line(&self.text)).dims(assets).width * scale) / 2.0;

        let fg_color = self.fg_color_for_style(&assets.style.borrow());
        write!(
            &mut svg,
            r##"<text xml:space="preserve" font-size="{}" font-family="{}" {} fill="{}" fill-opacity="{}" startOffset="{}">"##,
            // This is seemingly the easiest way to do this. We could .scale() the whole batch
            // after, but then we have to re-translate it to the proper spot
            (self.size as f64) * scale,
            self.font.family(),
            match self.font {
                Font::OverpassBold => "font-weight=\"bold\"",
                Font::OverpassSemiBold => "font-weight=\"600\"",
                _ => "",
            },
            fg_color.to_hex(),
            fg_color.a,
            start_offset,
        )
            .unwrap();

        write!(
            &mut svg,
            r##"<textPath href="#txtpath">{}</textPath></text></svg>"##,
            self.text
        )
        .unwrap();

        let svg_tree = match usvg::Tree::from_str(&svg, &assets.text_opts) {
            Ok(t) => t,
            Err(err) => panic!("curvey({}): {}", self.text, err),
        };
        let mut batch = GeomBatch::new();
        match crate::svg::add_svg_inner(&mut batch, svg_tree, tolerance) {
            Ok(_) => batch,
            Err(err) => panic!("curvey({}): {}", self.text, err),
        }
    }
}