cosmic_text/buffer.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
// SPDX-License-Identifier: MIT OR Apache-2.0
#[cfg(not(feature = "std"))]
use alloc::{string::String, vec::Vec};
use core::{cmp, fmt};
use unicode_segmentation::UnicodeSegmentation;
use crate::{
Affinity, Align, Attrs, AttrsList, BidiParagraphs, BorrowedWithFontSystem, BufferLine, Color,
Cursor, FontSystem, LayoutCursor, LayoutGlyph, LayoutLine, LineEnding, LineIter, Motion,
Scroll, ShapeLine, Shaping, Wrap,
};
/// A line of visible text for rendering
#[derive(Debug)]
pub struct LayoutRun<'a> {
/// The index of the original text line
pub line_i: usize,
/// The original text line
pub text: &'a str,
/// True if the original paragraph direction is RTL
pub rtl: bool,
/// The array of layout glyphs to draw
pub glyphs: &'a [LayoutGlyph],
/// Y offset to baseline of line
pub line_y: f32,
/// Y offset to top of line
pub line_top: f32,
/// Y offset to next line
pub line_height: f32,
/// Width of line
pub line_w: f32,
}
impl<'a> LayoutRun<'a> {
/// Return the pixel span `Some((x_left, x_width))` of the highlighted area between `cursor_start`
/// and `cursor_end` within this run, or None if the cursor range does not intersect this run.
/// This may return widths of zero if `cursor_start == cursor_end`, if the run is empty, or if the
/// region's left start boundary is the same as the cursor's end boundary or vice versa.
pub fn highlight(&self, cursor_start: Cursor, cursor_end: Cursor) -> Option<(f32, f32)> {
let mut x_start = None;
let mut x_end = None;
let rtl_factor = if self.rtl { 1. } else { 0. };
let ltr_factor = 1. - rtl_factor;
for glyph in self.glyphs.iter() {
let cursor = self.cursor_from_glyph_left(glyph);
if cursor >= cursor_start && cursor <= cursor_end {
if x_start.is_none() {
x_start = Some(glyph.x + glyph.w * rtl_factor);
}
x_end = Some(glyph.x + glyph.w * rtl_factor);
}
let cursor = self.cursor_from_glyph_right(glyph);
if cursor >= cursor_start && cursor <= cursor_end {
if x_start.is_none() {
x_start = Some(glyph.x + glyph.w * ltr_factor);
}
x_end = Some(glyph.x + glyph.w * ltr_factor);
}
}
if let Some(x_start) = x_start {
let x_end = x_end.expect("end of cursor not found");
let (x_start, x_end) = if x_start < x_end {
(x_start, x_end)
} else {
(x_end, x_start)
};
Some((x_start, x_end - x_start))
} else {
None
}
}
fn cursor_from_glyph_left(&self, glyph: &LayoutGlyph) -> Cursor {
if self.rtl {
Cursor::new_with_affinity(self.line_i, glyph.end, Affinity::Before)
} else {
Cursor::new_with_affinity(self.line_i, glyph.start, Affinity::After)
}
}
fn cursor_from_glyph_right(&self, glyph: &LayoutGlyph) -> Cursor {
if self.rtl {
Cursor::new_with_affinity(self.line_i, glyph.start, Affinity::After)
} else {
Cursor::new_with_affinity(self.line_i, glyph.end, Affinity::Before)
}
}
}
/// An iterator of visible text lines, see [`LayoutRun`]
#[derive(Debug)]
pub struct LayoutRunIter<'b> {
buffer: &'b Buffer,
line_i: usize,
layout_i: usize,
total_height: f32,
line_top: f32,
}
impl<'b> LayoutRunIter<'b> {
pub fn new(buffer: &'b Buffer) -> Self {
Self {
buffer,
line_i: buffer.scroll.line,
layout_i: 0,
total_height: 0.0,
line_top: 0.0,
}
}
}
impl<'b> Iterator for LayoutRunIter<'b> {
type Item = LayoutRun<'b>;
fn next(&mut self) -> Option<Self::Item> {
while let Some(line) = self.buffer.lines.get(self.line_i) {
let shape = line.shape_opt()?;
let layout = line.layout_opt()?;
while let Some(layout_line) = layout.get(self.layout_i) {
self.layout_i += 1;
let line_height = layout_line
.line_height_opt
.unwrap_or(self.buffer.metrics.line_height);
self.total_height += line_height;
let line_top = self.line_top - self.buffer.scroll.vertical;
let glyph_height = layout_line.max_ascent + layout_line.max_descent;
let centering_offset = (line_height - glyph_height) / 2.0;
let line_y = line_top + centering_offset + layout_line.max_ascent;
if let Some(height) = self.buffer.height_opt {
if line_y > height {
return None;
}
}
self.line_top += line_height;
if line_y < 0.0 {
continue;
}
return Some(LayoutRun {
line_i: self.line_i,
text: line.text(),
rtl: shape.rtl,
glyphs: &layout_line.glyphs,
line_y,
line_top,
line_height,
line_w: layout_line.w,
});
}
self.line_i += 1;
self.layout_i = 0;
}
None
}
}
/// Metrics of text
#[derive(Clone, Copy, Debug, Default, PartialEq)]
pub struct Metrics {
/// Font size in pixels
pub font_size: f32,
/// Line height in pixels
pub line_height: f32,
}
impl Metrics {
/// Create metrics with given font size and line height
pub const fn new(font_size: f32, line_height: f32) -> Self {
Self {
font_size,
line_height,
}
}
/// Create metrics with given font size and calculate line height using relative scale
pub fn relative(font_size: f32, line_height_scale: f32) -> Self {
Self {
font_size,
line_height: font_size * line_height_scale,
}
}
/// Scale font size and line height
pub fn scale(self, scale: f32) -> Self {
Self {
font_size: self.font_size * scale,
line_height: self.line_height * scale,
}
}
}
impl fmt::Display for Metrics {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}px / {}px", self.font_size, self.line_height)
}
}
/// A buffer of text that is shaped and laid out
#[derive(Debug)]
pub struct Buffer {
/// [BufferLine]s (or paragraphs) of text in the buffer
pub lines: Vec<BufferLine>,
metrics: Metrics,
width_opt: Option<f32>,
height_opt: Option<f32>,
scroll: Scroll,
/// True if a redraw is requires. Set to false after processing
redraw: bool,
wrap: Wrap,
monospace_width: Option<f32>,
tab_width: u16,
}
impl Clone for Buffer {
fn clone(&self) -> Self {
Self {
lines: self.lines.clone(),
metrics: self.metrics,
width_opt: self.width_opt,
height_opt: self.height_opt,
scroll: self.scroll,
redraw: self.redraw,
wrap: self.wrap,
monospace_width: self.monospace_width,
tab_width: self.tab_width,
}
}
}
impl Buffer {
/// Create an empty [`Buffer`] with the provided [`Metrics`].
/// This is useful for initializing a [`Buffer`] without a [`FontSystem`].
///
/// You must populate the [`Buffer`] with at least one [`BufferLine`] before shaping and layout,
/// for example by calling [`Buffer::set_text`].
///
/// If you have a [`FontSystem`] in scope, you should use [`Buffer::new`] instead.
///
/// # Panics
///
/// Will panic if `metrics.line_height` is zero.
pub fn new_empty(metrics: Metrics) -> Self {
assert_ne!(metrics.line_height, 0.0, "line height cannot be 0");
Self {
lines: Vec::new(),
metrics,
width_opt: None,
height_opt: None,
scroll: Scroll::default(),
redraw: false,
wrap: Wrap::WordOrGlyph,
monospace_width: None,
tab_width: 8,
}
}
/// Create a new [`Buffer`] with the provided [`FontSystem`] and [`Metrics`]
///
/// # Panics
///
/// Will panic if `metrics.line_height` is zero.
pub fn new(font_system: &mut FontSystem, metrics: Metrics) -> Self {
let mut buffer = Self::new_empty(metrics);
buffer.set_text(font_system, "", Attrs::new(), Shaping::Advanced);
buffer
}
/// Mutably borrows the buffer together with an [`FontSystem`] for more convenient methods
pub fn borrow_with<'a>(
&'a mut self,
font_system: &'a mut FontSystem,
) -> BorrowedWithFontSystem<'a, Buffer> {
BorrowedWithFontSystem {
inner: self,
font_system,
}
}
fn relayout(&mut self, font_system: &mut FontSystem) {
#[cfg(all(feature = "std", not(target_arch = "wasm32")))]
let instant = std::time::Instant::now();
for line in &mut self.lines {
if line.shape_opt().is_some() {
line.reset_layout();
line.layout(
font_system,
self.metrics.font_size,
self.width_opt,
self.wrap,
self.monospace_width,
self.tab_width,
);
}
}
self.redraw = true;
#[cfg(all(feature = "std", not(target_arch = "wasm32")))]
log::debug!("relayout: {:?}", instant.elapsed());
}
/// Shape lines until cursor, also scrolling to include cursor in view
pub fn shape_until_cursor(
&mut self,
font_system: &mut FontSystem,
cursor: Cursor,
prune: bool,
) {
let metrics = self.metrics;
let old_scroll = self.scroll;
let layout_cursor = self
.layout_cursor(font_system, cursor)
.expect("shape_until_cursor invalid cursor");
let mut layout_y = 0.0;
let mut total_height = {
let layout = self
.line_layout(font_system, layout_cursor.line)
.expect("shape_until_cursor failed to scroll forwards");
for layout_i in 0..layout_cursor.layout {
layout_y += layout[layout_i]
.line_height_opt
.unwrap_or(metrics.line_height);
}
layout_y
+ layout[layout_cursor.layout]
.line_height_opt
.unwrap_or(metrics.line_height)
};
if self.scroll.line > layout_cursor.line
|| (self.scroll.line == layout_cursor.line && self.scroll.vertical > layout_y)
{
// Adjust scroll backwards if cursor is before it
self.scroll.line = layout_cursor.line;
self.scroll.vertical = layout_y;
} else if let Some(height) = self.height_opt {
// Adjust scroll forwards if cursor is after it
let mut line_i = layout_cursor.line;
if line_i <= self.scroll.line {
// This is a single line that may wrap
if total_height > height + self.scroll.vertical {
self.scroll.vertical = total_height - height;
}
} else {
while line_i > self.scroll.line {
line_i -= 1;
let layout = self
.line_layout(font_system, line_i)
.expect("shape_until_cursor failed to scroll forwards");
for layout_line in layout.iter() {
total_height += layout_line.line_height_opt.unwrap_or(metrics.line_height);
}
if total_height > height + self.scroll.vertical {
self.scroll.line = line_i;
self.scroll.vertical = total_height - height;
}
}
}
}
if old_scroll != self.scroll {
self.redraw = true;
}
self.shape_until_scroll(font_system, prune);
// Adjust horizontal scroll to include cursor
if let Some(layout_cursor) = self.layout_cursor(font_system, cursor) {
if let Some(layout_lines) = self.line_layout(font_system, layout_cursor.line) {
if let Some(layout_line) = layout_lines.get(layout_cursor.layout) {
let (x_min, x_max) = if let Some(glyph) = layout_line
.glyphs
.get(layout_cursor.glyph)
.or_else(|| layout_line.glyphs.last())
{
//TODO: use code from cursor_glyph_opt?
let x_a = glyph.x;
let x_b = glyph.x + glyph.w;
(x_a.min(x_b), x_a.max(x_b))
} else {
(0.0, 0.0)
};
if x_min < self.scroll.horizontal {
self.scroll.horizontal = x_min;
self.redraw = true;
}
if let Some(width) = self.width_opt {
if x_max > self.scroll.horizontal + width {
self.scroll.horizontal = x_max - width;
self.redraw = true;
}
}
}
}
}
}
/// Shape lines until scroll
pub fn shape_until_scroll(&mut self, font_system: &mut FontSystem, prune: bool) {
let metrics = self.metrics;
let old_scroll = self.scroll;
loop {
// Adjust scroll.layout to be positive by moving scroll.line backwards
while self.scroll.vertical < 0.0 {
if self.scroll.line > 0 {
let line_i = self.scroll.line - 1;
if let Some(layout) = self.line_layout(font_system, line_i) {
let mut layout_height = 0.0;
for layout_line in layout.iter() {
layout_height +=
layout_line.line_height_opt.unwrap_or(metrics.line_height);
}
self.scroll.line = line_i;
self.scroll.vertical += layout_height;
} else {
// If layout is missing, just assume line height
self.scroll.line = line_i;
self.scroll.vertical += metrics.line_height;
}
} else {
self.scroll.vertical = 0.0;
break;
}
}
let scroll_start = self.scroll.vertical;
let scroll_end = scroll_start + self.height_opt.unwrap_or(f32::INFINITY);
let mut total_height = 0.0;
for line_i in 0..self.lines.len() {
if line_i < self.scroll.line {
if prune {
self.lines[line_i].reset_shaping();
}
continue;
}
if total_height > scroll_end {
if prune {
self.lines[line_i].reset_shaping();
continue;
} else {
break;
}
}
let mut layout_height = 0.0;
let layout = self
.line_layout(font_system, line_i)
.expect("shape_until_scroll invalid line");
for layout_line in layout.iter() {
let line_height = layout_line.line_height_opt.unwrap_or(metrics.line_height);
layout_height += line_height;
total_height += line_height;
}
// Adjust scroll.vertical to be smaller by moving scroll.line forwards
//TODO: do we want to adjust it exactly to a layout line?
if line_i == self.scroll.line && layout_height < self.scroll.vertical {
self.scroll.line += 1;
self.scroll.vertical -= layout_height;
}
}
if total_height < scroll_end && self.scroll.line > 0 {
// Need to scroll up to stay inside of buffer
self.scroll.vertical -= scroll_end - total_height;
} else {
// Done adjusting scroll
break;
}
}
if old_scroll != self.scroll {
self.redraw = true;
}
}
/// Convert a [`Cursor`] to a [`LayoutCursor`]
pub fn layout_cursor(
&mut self,
font_system: &mut FontSystem,
cursor: Cursor,
) -> Option<LayoutCursor> {
let layout = self.line_layout(font_system, cursor.line)?;
for (layout_i, layout_line) in layout.iter().enumerate() {
for (glyph_i, glyph) in layout_line.glyphs.iter().enumerate() {
let cursor_end =
Cursor::new_with_affinity(cursor.line, glyph.end, Affinity::Before);
let cursor_start =
Cursor::new_with_affinity(cursor.line, glyph.start, Affinity::After);
let (cursor_left, cursor_right) = if glyph.level.is_ltr() {
(cursor_start, cursor_end)
} else {
(cursor_end, cursor_start)
};
if cursor == cursor_left {
return Some(LayoutCursor::new(cursor.line, layout_i, glyph_i));
}
if cursor == cursor_right {
return Some(LayoutCursor::new(cursor.line, layout_i, glyph_i + 1));
}
}
}
// Fall back to start of line
//TODO: should this be the end of the line?
Some(LayoutCursor::new(cursor.line, 0, 0))
}
/// Shape the provided line index and return the result
pub fn line_shape(
&mut self,
font_system: &mut FontSystem,
line_i: usize,
) -> Option<&ShapeLine> {
let line = self.lines.get_mut(line_i)?;
Some(line.shape(font_system, self.tab_width))
}
/// Lay out the provided line index and return the result
pub fn line_layout(
&mut self,
font_system: &mut FontSystem,
line_i: usize,
) -> Option<&[LayoutLine]> {
let line = self.lines.get_mut(line_i)?;
Some(line.layout(
font_system,
self.metrics.font_size,
self.width_opt,
self.wrap,
self.monospace_width,
self.tab_width,
))
}
/// Get the current [`Metrics`]
pub fn metrics(&self) -> Metrics {
self.metrics
}
/// Set the current [`Metrics`]
///
/// # Panics
///
/// Will panic if `metrics.font_size` is zero.
pub fn set_metrics(&mut self, font_system: &mut FontSystem, metrics: Metrics) {
self.set_metrics_and_size(font_system, metrics, self.width_opt, self.height_opt);
}
/// Get the current [`Wrap`]
pub fn wrap(&self) -> Wrap {
self.wrap
}
/// Set the current [`Wrap`]
pub fn set_wrap(&mut self, font_system: &mut FontSystem, wrap: Wrap) {
if wrap != self.wrap {
self.wrap = wrap;
self.relayout(font_system);
self.shape_until_scroll(font_system, false);
}
}
/// Get the current `monospace_width`
pub fn monospace_width(&self) -> Option<f32> {
self.monospace_width
}
/// Set monospace width monospace glyphs should be resized to match. `None` means don't resize
pub fn set_monospace_width(
&mut self,
font_system: &mut FontSystem,
monospace_width: Option<f32>,
) {
if monospace_width != self.monospace_width {
self.monospace_width = monospace_width;
self.relayout(font_system);
self.shape_until_scroll(font_system, false);
}
}
/// Get the current `tab_width`
pub fn tab_width(&self) -> u16 {
self.tab_width
}
/// Set tab width (number of spaces between tab stops)
pub fn set_tab_width(&mut self, font_system: &mut FontSystem, tab_width: u16) {
// A tab width of 0 is not allowed
if tab_width == 0 {
return;
}
if tab_width != self.tab_width {
self.tab_width = tab_width;
// Shaping must be reset when tab width is changed
for line in self.lines.iter_mut() {
if line.shape_opt().is_some() {
if line.text().contains('\t') {
line.reset_shaping();
}
}
}
self.redraw = true;
self.shape_until_scroll(font_system, false);
}
}
/// Get the current buffer dimensions (width, height)
pub fn size(&self) -> (Option<f32>, Option<f32>) {
(self.width_opt, self.height_opt)
}
/// Set the current buffer dimensions
pub fn set_size(
&mut self,
font_system: &mut FontSystem,
width_opt: Option<f32>,
height_opt: Option<f32>,
) {
self.set_metrics_and_size(font_system, self.metrics, width_opt, height_opt);
}
/// Set the current [`Metrics`] and buffer dimensions at the same time
///
/// # Panics
///
/// Will panic if `metrics.font_size` is zero.
pub fn set_metrics_and_size(
&mut self,
font_system: &mut FontSystem,
metrics: Metrics,
width_opt: Option<f32>,
height_opt: Option<f32>,
) {
let clamped_width_opt = width_opt.map(|width| width.max(0.0));
let clamped_height_opt = height_opt.map(|height| height.max(0.0));
if metrics != self.metrics
|| clamped_width_opt != self.width_opt
|| clamped_height_opt != self.height_opt
{
assert_ne!(metrics.font_size, 0.0, "font size cannot be 0");
self.metrics = metrics;
self.width_opt = clamped_width_opt;
self.height_opt = clamped_height_opt;
self.relayout(font_system);
self.shape_until_scroll(font_system, false);
}
}
/// Get the current scroll location
pub fn scroll(&self) -> Scroll {
self.scroll
}
/// Set the current scroll location
pub fn set_scroll(&mut self, scroll: Scroll) {
if scroll != self.scroll {
self.scroll = scroll;
self.redraw = true;
}
}
/// Set text of buffer, using provided attributes for each line by default
pub fn set_text(
&mut self,
font_system: &mut FontSystem,
text: &str,
attrs: Attrs,
shaping: Shaping,
) {
self.lines.clear();
for (range, ending) in LineIter::new(text) {
self.lines.push(BufferLine::new(
&text[range],
ending,
AttrsList::new(attrs),
shaping,
));
}
if self.lines.is_empty() {
self.lines.push(BufferLine::new(
"",
LineEnding::default(),
AttrsList::new(attrs),
shaping,
));
}
self.scroll = Scroll::default();
self.shape_until_scroll(font_system, false);
}
/// Set text of buffer, using an iterator of styled spans (pairs of text and attributes)
///
/// ```
/// # use cosmic_text::{Attrs, Buffer, Family, FontSystem, Metrics, Shaping};
/// # let mut font_system = FontSystem::new();
/// let mut buffer = Buffer::new_empty(Metrics::new(32.0, 44.0));
/// let attrs = Attrs::new().family(Family::Serif);
/// buffer.set_rich_text(
/// &mut font_system,
/// [
/// ("hello, ", attrs),
/// ("cosmic\ntext", attrs.family(Family::Monospace)),
/// ],
/// attrs,
/// Shaping::Advanced,
/// None,
/// );
/// ```
pub fn set_rich_text<'r, 's, I>(
&mut self,
font_system: &mut FontSystem,
spans: I,
default_attrs: Attrs,
shaping: Shaping,
alignment: Option<Align>,
) where
I: IntoIterator<Item = (&'s str, Attrs<'r>)>,
{
let mut end = 0;
// TODO: find a way to cache this string and vec for reuse
let (string, spans_data): (String, Vec<_>) = spans
.into_iter()
.map(|(s, attrs)| {
let start = end;
end += s.len();
(s, (attrs, start..end))
})
.unzip();
let mut spans_iter = spans_data.into_iter();
let mut maybe_span = spans_iter.next();
// split the string into lines, as ranges
let string_start = string.as_ptr() as usize;
let mut lines_iter = BidiParagraphs::new(&string).map(|line: &str| {
let start = line.as_ptr() as usize - string_start;
let end = start + line.len();
start..end
});
let mut maybe_line = lines_iter.next();
//TODO: set this based on information from spans
let line_ending = LineEnding::default();
let mut line_count = 0;
let mut attrs_list = self
.lines
.get_mut(line_count)
.map(BufferLine::reclaim_attrs)
.unwrap_or_else(|| AttrsList::new(Attrs::new()))
.reset(default_attrs);
let mut line_string = self
.lines
.get_mut(line_count)
.map(BufferLine::reclaim_text)
.unwrap_or_default();
loop {
let (Some(line_range), Some((attrs, span_range))) = (&maybe_line, &maybe_span) else {
// this is reached only if this text is empty
if self.lines.len() == line_count {
self.lines.push(BufferLine::empty());
}
self.lines[line_count].reset_new(
String::new(),
line_ending,
AttrsList::new(default_attrs),
shaping,
);
line_count += 1;
break;
};
// start..end is the intersection of this line and this span
let start = line_range.start.max(span_range.start);
let end = line_range.end.min(span_range.end);
if start < end {
let text = &string[start..end];
let text_start = line_string.len();
line_string.push_str(text);
let text_end = line_string.len();
// Only add attrs if they don't match the defaults
if *attrs != attrs_list.defaults() {
attrs_list.add_span(text_start..text_end, *attrs);
}
}
// we know that at the end of a line,
// span text's end index is always >= line text's end index
// so if this span ends before this line ends,
// there is another span in this line.
// otherwise, we move on to the next line.
if span_range.end < line_range.end {
maybe_span = spans_iter.next();
} else {
maybe_line = lines_iter.next();
if maybe_line.is_some() {
// finalize this line and start a new line
let next_attrs_list = self
.lines
.get_mut(line_count + 1)
.map(BufferLine::reclaim_attrs)
.unwrap_or_else(|| AttrsList::new(Attrs::new()))
.reset(default_attrs);
let next_line_string = self
.lines
.get_mut(line_count + 1)
.map(BufferLine::reclaim_text)
.unwrap_or_default();
let prev_attrs_list = core::mem::replace(&mut attrs_list, next_attrs_list);
let prev_line_string = core::mem::replace(&mut line_string, next_line_string);
if self.lines.len() == line_count {
self.lines.push(BufferLine::empty());
}
self.lines[line_count].reset_new(
prev_line_string,
line_ending,
prev_attrs_list,
shaping,
);
line_count += 1;
} else {
// finalize the final line
if self.lines.len() == line_count {
self.lines.push(BufferLine::empty());
}
self.lines[line_count].reset_new(line_string, line_ending, attrs_list, shaping);
line_count += 1;
break;
}
}
}
// Discard excess lines now that we have reused as much of the existing allocations as possible.
self.lines.truncate(line_count);
self.lines.iter_mut().for_each(|line| {
line.set_align(alignment);
});
self.scroll = Scroll::default();
self.shape_until_scroll(font_system, false);
}
/// True if a redraw is needed
pub fn redraw(&self) -> bool {
self.redraw
}
/// Set redraw needed flag
pub fn set_redraw(&mut self, redraw: bool) {
self.redraw = redraw;
}
/// Get the visible layout runs for rendering and other tasks
pub fn layout_runs(&self) -> LayoutRunIter {
LayoutRunIter::new(self)
}
/// Convert x, y position to Cursor (hit detection)
pub fn hit(&self, x: f32, y: f32) -> Option<Cursor> {
#[cfg(all(feature = "std", not(target_arch = "wasm32")))]
let instant = std::time::Instant::now();
let mut new_cursor_opt = None;
let mut runs = self.layout_runs().peekable();
let mut first_run = true;
while let Some(run) = runs.next() {
let line_top = run.line_top;
let line_height = run.line_height;
if first_run && y < line_top {
first_run = false;
let new_cursor = Cursor::new(run.line_i, 0);
new_cursor_opt = Some(new_cursor);
} else if y >= line_top && y < line_top + line_height {
let mut new_cursor_glyph = run.glyphs.len();
let mut new_cursor_char = 0;
let mut new_cursor_affinity = Affinity::After;
let mut first_glyph = true;
'hit: for (glyph_i, glyph) in run.glyphs.iter().enumerate() {
if first_glyph {
first_glyph = false;
if (run.rtl && x > glyph.x) || (!run.rtl && x < 0.0) {
new_cursor_glyph = 0;
new_cursor_char = 0;
}
}
if x >= glyph.x && x <= glyph.x + glyph.w {
new_cursor_glyph = glyph_i;
let cluster = &run.text[glyph.start..glyph.end];
let total = cluster.grapheme_indices(true).count();
let mut egc_x = glyph.x;
let egc_w = glyph.w / (total as f32);
for (egc_i, egc) in cluster.grapheme_indices(true) {
if x >= egc_x && x <= egc_x + egc_w {
new_cursor_char = egc_i;
let right_half = x >= egc_x + egc_w / 2.0;
if right_half != glyph.level.is_rtl() {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char += egc.len();
new_cursor_affinity = Affinity::Before;
}
break 'hit;
}
egc_x += egc_w;
}
let right_half = x >= glyph.x + glyph.w / 2.0;
if right_half != glyph.level.is_rtl() {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char = cluster.len();
new_cursor_affinity = Affinity::Before;
}
break 'hit;
}
}
let mut new_cursor = Cursor::new(run.line_i, 0);
match run.glyphs.get(new_cursor_glyph) {
Some(glyph) => {
// Position at glyph
new_cursor.index = glyph.start + new_cursor_char;
new_cursor.affinity = new_cursor_affinity;
}
None => {
if let Some(glyph) = run.glyphs.last() {
// Position at end of line
new_cursor.index = glyph.end;
new_cursor.affinity = Affinity::Before;
}
}
}
new_cursor_opt = Some(new_cursor);
break;
} else if runs.peek().is_none() && y > run.line_y {
let mut new_cursor = Cursor::new(run.line_i, 0);
if let Some(glyph) = run.glyphs.last() {
new_cursor = run.cursor_from_glyph_right(glyph);
}
new_cursor_opt = Some(new_cursor);
}
}
#[cfg(all(feature = "std", not(target_arch = "wasm32")))]
log::trace!("click({}, {}): {:?}", x, y, instant.elapsed());
new_cursor_opt
}
/// Apply a [`Motion`] to a [`Cursor`]
pub fn cursor_motion(
&mut self,
font_system: &mut FontSystem,
mut cursor: Cursor,
mut cursor_x_opt: Option<i32>,
motion: Motion,
) -> Option<(Cursor, Option<i32>)> {
match motion {
Motion::LayoutCursor(layout_cursor) => {
let layout = self.line_layout(font_system, layout_cursor.line)?;
let layout_line = match layout.get(layout_cursor.layout) {
Some(some) => some,
None => match layout.last() {
Some(some) => some,
None => {
return None;
}
},
};
let (new_index, new_affinity) = match layout_line.glyphs.get(layout_cursor.glyph) {
Some(glyph) => (glyph.start, Affinity::After),
None => match layout_line.glyphs.last() {
Some(glyph) => (glyph.end, Affinity::Before),
//TODO: is this correct?
None => (0, Affinity::After),
},
};
if cursor.line != layout_cursor.line
|| cursor.index != new_index
|| cursor.affinity != new_affinity
{
cursor.line = layout_cursor.line;
cursor.index = new_index;
cursor.affinity = new_affinity;
}
}
Motion::Previous => {
let line = self.lines.get(cursor.line)?;
if cursor.index > 0 {
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().grapheme_indices(true) {
if i < cursor.index {
prev_index = i;
} else {
break;
}
}
cursor.index = prev_index;
cursor.affinity = Affinity::After;
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.index = self.lines.get(cursor.line)?.text().len();
cursor.affinity = Affinity::After;
}
cursor_x_opt = None;
}
Motion::Next => {
let line = self.lines.get(cursor.line)?;
if cursor.index < line.text().len() {
for (i, c) in line.text().grapheme_indices(true) {
if i == cursor.index {
cursor.index += c.len();
cursor.affinity = Affinity::Before;
break;
}
}
} else if cursor.line + 1 < self.lines.len() {
cursor.line += 1;
cursor.index = 0;
cursor.affinity = Affinity::Before;
}
cursor_x_opt = None;
}
Motion::Left => {
let rtl_opt = self
.line_shape(font_system, cursor.line)
.map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
(cursor, cursor_x_opt) =
self.cursor_motion(font_system, cursor, cursor_x_opt, Motion::Next)?;
} else {
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::Previous,
)?;
}
}
}
Motion::Right => {
let rtl_opt = self
.line_shape(font_system, cursor.line)
.map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::Previous,
)?;
} else {
(cursor, cursor_x_opt) =
self.cursor_motion(font_system, cursor, cursor_x_opt, Motion::Next)?;
}
}
}
Motion::Up => {
let mut layout_cursor = self.layout_cursor(font_system, cursor)?;
if cursor_x_opt.is_none() {
cursor_x_opt = Some(
layout_cursor.glyph as i32, //TODO: glyph x position
);
}
if layout_cursor.layout > 0 {
layout_cursor.layout -= 1;
} else if layout_cursor.line > 0 {
layout_cursor.line -= 1;
layout_cursor.layout = usize::max_value();
}
if let Some(cursor_x) = cursor_x_opt {
layout_cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::LayoutCursor(layout_cursor),
)?;
}
Motion::Down => {
let mut layout_cursor = self.layout_cursor(font_system, cursor)?;
let layout_len = self.line_layout(font_system, layout_cursor.line)?.len();
if cursor_x_opt.is_none() {
cursor_x_opt = Some(
layout_cursor.glyph as i32, //TODO: glyph x position
);
}
if layout_cursor.layout + 1 < layout_len {
layout_cursor.layout += 1;
} else if layout_cursor.line + 1 < self.lines.len() {
layout_cursor.line += 1;
layout_cursor.layout = 0;
}
if let Some(cursor_x) = cursor_x_opt {
layout_cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::LayoutCursor(layout_cursor),
)?;
}
Motion::Home => {
let mut layout_cursor = self.layout_cursor(font_system, cursor)?;
layout_cursor.glyph = 0;
#[allow(unused_assignments)]
{
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::LayoutCursor(layout_cursor),
)?;
}
cursor_x_opt = None;
}
Motion::SoftHome => {
let line = self.lines.get(cursor.line)?;
cursor.index = line
.text()
.char_indices()
.filter_map(|(i, c)| if c.is_whitespace() { None } else { Some(i) })
.next()
.unwrap_or(0);
cursor_x_opt = None;
}
Motion::End => {
let mut layout_cursor = self.layout_cursor(font_system, cursor)?;
layout_cursor.glyph = usize::max_value();
#[allow(unused_assignments)]
{
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::LayoutCursor(layout_cursor),
)?;
}
cursor_x_opt = None;
}
Motion::ParagraphStart => {
cursor.index = 0;
cursor_x_opt = None;
}
Motion::ParagraphEnd => {
cursor.index = self.lines.get(cursor.line)?.text().len();
cursor_x_opt = None;
}
Motion::PageUp => {
if let Some(height) = self.height_opt {
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::Vertical(-height as i32),
)?;
}
}
Motion::PageDown => {
if let Some(height) = self.height_opt {
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::Vertical(height as i32),
)?;
}
}
Motion::Vertical(px) => {
// TODO more efficient, use layout run line height
let lines = px / self.metrics().line_height as i32;
match lines.cmp(&0) {
cmp::Ordering::Less => {
for _ in 0..-lines {
(cursor, cursor_x_opt) =
self.cursor_motion(font_system, cursor, cursor_x_opt, Motion::Up)?;
}
}
cmp::Ordering::Greater => {
for _ in 0..lines {
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::Down,
)?;
}
}
cmp::Ordering::Equal => {}
}
}
Motion::PreviousWord => {
let line = self.lines.get(cursor.line)?;
if cursor.index > 0 {
cursor.index = line
.text()
.unicode_word_indices()
.rev()
.map(|(i, _)| i)
.find(|&i| i < cursor.index)
.unwrap_or(0);
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.index = self.lines.get(cursor.line)?.text().len();
}
cursor_x_opt = None;
}
Motion::NextWord => {
let line = self.lines.get(cursor.line)?;
if cursor.index < line.text().len() {
cursor.index = line
.text()
.unicode_word_indices()
.map(|(i, word)| i + word.len())
.find(|&i| i > cursor.index)
.unwrap_or(line.text().len());
} else if cursor.line + 1 < self.lines.len() {
cursor.line += 1;
cursor.index = 0;
}
cursor_x_opt = None;
}
Motion::LeftWord => {
let rtl_opt = self
.line_shape(font_system, cursor.line)
.map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::NextWord,
)?;
} else {
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::PreviousWord,
)?;
}
}
}
Motion::RightWord => {
let rtl_opt = self
.line_shape(font_system, cursor.line)
.map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::PreviousWord,
)?;
} else {
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::NextWord,
)?;
}
}
}
Motion::BufferStart => {
cursor.line = 0;
cursor.index = 0;
cursor_x_opt = None;
}
Motion::BufferEnd => {
cursor.line = self.lines.len().saturating_sub(1);
cursor.index = self.lines.get(cursor.line)?.text().len();
cursor_x_opt = None;
}
Motion::GotoLine(line) => {
let mut layout_cursor = self.layout_cursor(font_system, cursor)?;
layout_cursor.line = line;
(cursor, cursor_x_opt) = self.cursor_motion(
font_system,
cursor,
cursor_x_opt,
Motion::LayoutCursor(layout_cursor),
)?;
}
}
Some((cursor, cursor_x_opt))
}
/// Draw the buffer
#[cfg(feature = "swash")]
pub fn draw<F>(
&self,
font_system: &mut FontSystem,
cache: &mut crate::SwashCache,
color: Color,
mut f: F,
) where
F: FnMut(i32, i32, u32, u32, Color),
{
for run in self.layout_runs() {
for glyph in run.glyphs.iter() {
let physical_glyph = glyph.physical((0., 0.), 1.0);
let glyph_color = match glyph.color_opt {
Some(some) => some,
None => color,
};
cache.with_pixels(
font_system,
physical_glyph.cache_key,
glyph_color,
|x, y, color| {
f(
physical_glyph.x + x,
run.line_y as i32 + physical_glyph.y + y,
1,
1,
color,
);
},
);
}
}
}
}
impl<'a> BorrowedWithFontSystem<'a, Buffer> {
/// Shape lines until cursor, also scrolling to include cursor in view
pub fn shape_until_cursor(&mut self, cursor: Cursor, prune: bool) {
self.inner
.shape_until_cursor(self.font_system, cursor, prune);
}
/// Shape lines until scroll
pub fn shape_until_scroll(&mut self, prune: bool) {
self.inner.shape_until_scroll(self.font_system, prune);
}
/// Shape the provided line index and return the result
pub fn line_shape(&mut self, line_i: usize) -> Option<&ShapeLine> {
self.inner.line_shape(self.font_system, line_i)
}
/// Lay out the provided line index and return the result
pub fn line_layout(&mut self, line_i: usize) -> Option<&[LayoutLine]> {
self.inner.line_layout(self.font_system, line_i)
}
/// Set the current [`Metrics`]
///
/// # Panics
///
/// Will panic if `metrics.font_size` is zero.
pub fn set_metrics(&mut self, metrics: Metrics) {
self.inner.set_metrics(self.font_system, metrics);
}
/// Set the current [`Wrap`]
pub fn set_wrap(&mut self, wrap: Wrap) {
self.inner.set_wrap(self.font_system, wrap);
}
/// Set the current buffer dimensions
pub fn set_size(&mut self, width_opt: Option<f32>, height_opt: Option<f32>) {
self.inner.set_size(self.font_system, width_opt, height_opt);
}
/// Set the current [`Metrics`] and buffer dimensions at the same time
///
/// # Panics
///
/// Will panic if `metrics.font_size` is zero.
pub fn set_metrics_and_size(
&mut self,
metrics: Metrics,
width_opt: Option<f32>,
height_opt: Option<f32>,
) {
self.inner
.set_metrics_and_size(self.font_system, metrics, width_opt, height_opt);
}
/// Set tab width (number of spaces between tab stops)
pub fn set_tab_width(&mut self, tab_width: u16) {
self.inner.set_tab_width(self.font_system, tab_width);
}
/// Set text of buffer, using provided attributes for each line by default
pub fn set_text(&mut self, text: &str, attrs: Attrs, shaping: Shaping) {
self.inner.set_text(self.font_system, text, attrs, shaping);
}
/// Set text of buffer, using an iterator of styled spans (pairs of text and attributes)
///
/// ```
/// # use cosmic_text::{Attrs, Buffer, Family, FontSystem, Metrics, Shaping};
/// # let mut font_system = FontSystem::new();
/// let mut buffer = Buffer::new_empty(Metrics::new(32.0, 44.0));
/// let mut buffer = buffer.borrow_with(&mut font_system);
/// let attrs = Attrs::new().family(Family::Serif);
/// buffer.set_rich_text(
/// [
/// ("hello, ", attrs),
/// ("cosmic\ntext", attrs.family(Family::Monospace)),
/// ],
/// attrs,
/// Shaping::Advanced,
/// None,
/// );
/// ```
pub fn set_rich_text<'r, 's, I>(
&mut self,
spans: I,
default_attrs: Attrs,
shaping: Shaping,
alignment: Option<Align>,
) where
I: IntoIterator<Item = (&'s str, Attrs<'r>)>,
{
self.inner
.set_rich_text(self.font_system, spans, default_attrs, shaping, alignment);
}
/// Apply a [`Motion`] to a [`Cursor`]
pub fn cursor_motion(
&mut self,
cursor: Cursor,
cursor_x_opt: Option<i32>,
motion: Motion,
) -> Option<(Cursor, Option<i32>)> {
self.inner
.cursor_motion(self.font_system, cursor, cursor_x_opt, motion)
}
/// Draw the buffer
#[cfg(feature = "swash")]
pub fn draw<F>(&mut self, cache: &mut crate::SwashCache, color: Color, f: F)
where
F: FnMut(i32, i32, u32, u32, Color),
{
self.inner.draw(self.font_system, cache, color, f);
}
}