zng_ext_undo/lib.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 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
#![doc(html_favicon_url = "https://raw.githubusercontent.com/zng-ui/zng/main/examples/image/res/zng-logo-icon.png")]
#![doc(html_logo_url = "https://raw.githubusercontent.com/zng-ui/zng/main/examples/image/res/zng-logo.png")]
//!
//! Undo-redo app extension, service and commands.
//!
//! # Crate
//!
#![doc = include_str!(concat!("../", std::env!("CARGO_PKG_README")))]
#![warn(unused_extern_crates)]
#![warn(missing_docs)]
#![recursion_limit = "256"]
// suppress nag about very simple boxed closure signatures.
#![expect(clippy::type_complexity)]
use std::{
any::Any,
fmt, mem,
sync::{
atomic::{AtomicBool, Ordering},
Arc,
},
time::Duration,
};
use atomic::Atomic;
use parking_lot::Mutex;
use zng_app::{
event::CommandScope,
event::{command, AnyEventArgs, Command, CommandNameExt},
shortcut::{shortcut, CommandShortcutExt},
update::EventUpdate,
widget::{
info::{WidgetInfo, WidgetInfoBuilder},
WidgetId, WIDGET,
},
AppExtension, DInstant, INSTANT,
};
use zng_app_context::{app_local, context_local, RunOnDrop};
use zng_clone_move::clmv;
use zng_ext_input::{focus::cmd::CommandFocusExt, keyboard::KEYBOARD};
use zng_state_map::{static_id, StateId, StateMapRef};
use zng_txt::Txt;
use zng_var::{context_var, var, BoxedVar, Var, VarHandle, VarValue, WeakVar};
use zng_wgt::{wgt_fn, CommandIconExt as _, ICONS};
mod private {
// https://rust-lang.github.io/api-guidelines/future-proofing.html#sealed-traits-protect-against-downstream-implementations-c-sealed
pub trait Sealed {}
}
/// Undo-redo app extension.
///
/// # Services
///
/// Services provided by this extension.
///
/// * [`UNDO`]
#[derive(Default)]
pub struct UndoManager {}
impl AppExtension for UndoManager {
fn event(&mut self, update: &mut EventUpdate) {
// app scope handler
if let Some(args) = UNDO_CMD.on_unhandled(update) {
args.propagation().stop();
if let Some(c) = args.param::<u32>() {
UNDO.undo_select(*c);
} else if let Some(i) = args.param::<Duration>() {
UNDO.undo_select(*i);
} else if let Some(t) = args.param::<DInstant>() {
UNDO.undo_select(*t);
} else {
UNDO.undo();
}
} else if let Some(args) = REDO_CMD.on_unhandled(update) {
args.propagation().stop();
if let Some(c) = args.param::<u32>() {
UNDO.redo_select(*c);
} else if let Some(i) = args.param::<Duration>() {
UNDO.redo_select(*i);
} else if let Some(t) = args.param::<DInstant>() {
UNDO.redo_select(*t);
} else {
UNDO.redo();
}
}
}
}
context_var! {
/// Contextual undo limit.
///
/// Is [`UNDO.undo_limit`] by default.
///
/// [`UNDO.undo_limit`]: UNDO::undo_limit
pub static UNDO_LIMIT_VAR: u32 = UNDO.undo_limit();
/// Contextual undo interval.
///
/// Is [`UNDO.undo_interval`] by default.
///
/// [`UNDO.undo_interval`]: UNDO::undo_interval
pub static UNDO_INTERVAL_VAR: Duration = UNDO.undo_interval();
}
/// Undo-redo service.
pub struct UNDO;
impl UNDO {
/// Gets or sets the maximum length of each undo stack of each scope.
///
/// Is `u32::MAX` by default. If the limit is reached the oldest undo action is dropped without redo.
///
/// Note that undo scopes get the max undo from [`UNDO_LIMIT_VAR`] in context, the context var is
/// set to this var by default.
pub fn undo_limit(&self) -> BoxedVar<u32> {
UNDO_SV.read().undo_limit.clone()
}
/// Gets or sets the time interval that [`undo`] and [`redo`] cover each call.
///
/// This value applies to all scopes and defines the max interval between actions
/// that are undone in a single call.
///
/// Is the [keyboard repeat start delay + interval] by default.
///
/// Note that undo scopes get the interval from [`UNDO_INTERVAL_VAR`] in context, the context var is
/// set to this var by default.
///
/// [`undo`]: Self::undo
/// [`redo`]: Self::redo
/// [keyboard repeat start delay + interval]: zng_ext_input::keyboard::KEYBOARD::repeat_config
pub fn undo_interval(&self) -> BoxedVar<Duration> {
UNDO_SV.read().undo_interval.clone()
}
/// Gets if the undo service is enabled in the current context.
///
/// If `false` calls to [`register`] are ignored.
///
/// [`register`]: Self::register
pub fn is_enabled(&self) -> bool {
UNDO_SCOPE_CTX.get().enabled.load(Ordering::Relaxed) && UNDO_SV.read().undo_limit.get() > 0
}
/// Undo a selection of actions.
///
/// # Selectors
///
/// These types can be used as selector:
///
/// * `u32` - Count of actions to undo.
/// * `Duration` - Interval between each action.
/// * `DInstant` - Inclusive timestamp to undo back to.
pub fn undo_select(&self, selector: impl UndoSelector) {
UNDO_SCOPE_CTX.get().undo_select(selector);
}
/// Redo a selection of actions.
pub fn redo_select(&self, selector: impl UndoSelector) {
UNDO_SCOPE_CTX.get().redo_select(selector);
}
/// Undo all actions within the [`undo_interval`].
///
/// [`undo_interval`]: Self::undo_interval
pub fn undo(&self) {
self.undo_select(UNDO_INTERVAL_VAR.get());
}
/// Redo all actions within the [`undo_interval`].
///
/// [`undo_interval`]: Self::undo_interval
pub fn redo(&self) {
self.redo_select(UNDO_INTERVAL_VAR.get());
}
/// Gets the parent ID that defines an undo scope, or `None` if undo is registered globally for
/// the entire app.
pub fn scope(&self) -> Option<WidgetId> {
UNDO_SCOPE_CTX.get().id()
}
/// Register an already executed action for undo in the current scope.
pub fn register(&self, action: impl UndoAction) {
UNDO_SCOPE_CTX.get().register(Box::new(action))
}
/// Register an already executed action for undo in the current scope.
///
/// The action is defined as a closure `op` that matches over [`UndoOp`] to implement undo and redo.
pub fn register_op(&self, info: impl UndoInfo, op: impl FnMut(UndoOp) + Send + 'static) {
self.register(UndoRedoOp {
info: info.into_dyn(),
op: Box::new(op),
})
}
/// Register an already executed action for undo in the current scope.
///
/// The action is defined as a closure `op` that matches over [`UndoFullOp`] referencing `data` to implement undo and redo.
pub fn register_full_op<D>(&self, data: D, mut op: impl FnMut(&mut D, UndoFullOp) + Send + 'static)
where
D: Any + Send + 'static,
{
self.register(UndoRedoFullOp {
data: Box::new(data),
op: Box::new(move |d, o| {
op(d.downcast_mut::<D>().unwrap(), o);
}),
})
}
/// Run the `action` and register the undo in the current scope.
pub fn run(&self, action: impl RedoAction) {
UNDO_SCOPE_CTX.get().register(Box::new(action).redo())
}
/// Run the `op` once with [`UndoOp::Redo`] and register it for undo in the current scope.
pub fn run_op(&self, info: impl UndoInfo, op: impl FnMut(UndoOp) + Send + 'static) {
self.run(UndoRedoOp {
info: info.into_dyn(),
op: Box::new(op),
})
}
/// Run the `op` once with `UndoFullOp::Init { .. }` and `UndoFullOp::Op(UndoOp::Redo)` and register it for undo in the current scope.
pub fn run_full_op<D>(&self, mut data: D, mut op: impl FnMut(&mut D, UndoFullOp) + Send + 'static)
where
D: Any + Send + 'static,
{
let mut redo = true;
op(&mut data, UndoFullOp::Init { redo: &mut redo });
if redo {
self.run(UndoRedoFullOp {
data: Box::new(data),
op: Box::new(move |d, o| {
op(d.downcast_mut::<D>().unwrap(), o);
}),
})
}
}
/// Run `actions` as a [`transaction`] and commits as a group if any undo action is captured.
///
/// [`transaction`]: Self::transaction
pub fn group(&self, info: impl UndoInfo, actions: impl FnOnce()) -> bool {
let t = self.transaction(actions);
let any = !t.is_empty();
if any {
t.commit_group(info);
}
any
}
/// Run `actions` in a new undo scope, capturing all undo actions inside it into a new
/// [`UndoTransaction`].
///
/// The transaction can be immediately undone or committed.
pub fn transaction(&self, actions: impl FnOnce()) -> UndoTransaction {
let mut scope = UndoScope::default();
let parent_scope = UNDO_SCOPE_CTX.get();
*scope.enabled.get_mut() = parent_scope.enabled.load(Ordering::Relaxed);
*scope.id.get_mut() = parent_scope.id.load(Ordering::Relaxed);
let t_scope = Arc::new(scope);
let _panic_undo = RunOnDrop::new(clmv!(t_scope, || {
for undo in mem::take(&mut *t_scope.undo.lock()).into_iter().rev() {
let _ = undo.action.undo();
}
}));
let mut scope = Some(t_scope);
UNDO_SCOPE_CTX.with_context(&mut scope, actions);
let scope = scope.unwrap();
let undo = mem::take(&mut *scope.undo.lock());
UndoTransaction { undo }
}
/// Run `actions` as a [`transaction`] and commits as a group if the result is `Ok(O)` and at least one
/// undo action was registered, or undoes all if result is `Err(E)`.
///
/// [`transaction`]: Self::transaction
pub fn try_group<O, E>(&self, info: impl UndoInfo, actions: impl FnOnce() -> Result<O, E>) -> Result<O, E> {
let mut r = None;
let t = self.transaction(|| r = Some(actions()));
let r = r.unwrap();
if !t.is_empty() {
if r.is_ok() {
t.commit_group(info);
} else {
t.undo();
}
}
r
}
/// Run `actions` as a [`transaction`] and commits if the result is `Ok(O)`, or undoes all if result is `Err(E)`.
///
/// [`transaction`]: Self::transaction
pub fn try_commit<O, E>(&self, actions: impl FnOnce() -> Result<O, E>) -> Result<O, E> {
let mut r = None;
let t = self.transaction(|| r = Some(actions()));
let r = r.unwrap();
if !t.is_empty() {
if r.is_ok() {
t.commit();
} else {
t.undo();
}
}
r
}
/// Runs `f` in a new `scope`. All undo actions inside `f` are registered in the `scope`.
pub fn with_scope<R>(&self, scope: &mut WidgetUndoScope, f: impl FnOnce() -> R) -> R {
UNDO_SCOPE_CTX.with_context(&mut scope.0, f)
}
/// Runs `f` in a disabled scope, all undo actions registered inside `f` are ignored.
pub fn with_disabled<R>(&self, f: impl FnOnce() -> R) -> R {
let mut scope = UndoScope::default();
let parent_scope = UNDO_SCOPE_CTX.get();
*scope.enabled.get_mut() = false;
*scope.id.get_mut() = parent_scope.id.load(Ordering::Relaxed);
UNDO_SCOPE_CTX.with_context(&mut Some(Arc::new(scope)), f)
}
/// Track changes on `var`, registering undo actions for it.
///
/// The variable will be tracked until the returned handle or the var is dropped.
///
/// Note that this will keep strong clones of previous and new value every time the variable changes, but
/// it will only keep weak references to the variable. Dropping the handle or the var will not remove undo/redo
/// entries for it, they will still try to assign the variable, failing silently if the variable is dropped too.
///
/// Var updates caused by undo and redo are tagged with [`UndoVarModifyTag`].
pub fn watch_var<T: VarValue>(&self, info: impl UndoInfo, var: impl Var<T>) -> VarHandle {
if var.capabilities().is_always_read_only() {
return VarHandle::dummy();
}
let var = var.actual_var();
let wk_var = var.downgrade();
let mut prev_value = Some(var.get());
let info = info.into_dyn();
var.trace_value(move |args| {
if args.downcast_tags::<UndoVarModifyTag>().next().is_none() {
let prev = prev_value.take().unwrap();
let new = args.value();
if &prev == new {
// no actual change
prev_value = Some(prev);
return;
}
prev_value = Some(new.clone());
UNDO.register_op(
info.clone(),
clmv!(wk_var, new, |op| if let Some(var) = wk_var.upgrade() {
let _ = match op {
UndoOp::Undo => var.modify(clmv!(prev, |args| {
args.set(prev);
args.push_tag(UndoVarModifyTag);
})),
UndoOp::Redo => var.modify(clmv!(new, |args| {
args.set(new);
args.push_tag(UndoVarModifyTag);
})),
};
}),
);
}
})
}
/// Clear all redo actions.
pub fn clear_redo(&self) {
UNDO_SCOPE_CTX.get().redo.lock().clear();
}
/// Clear all undo and redo actions.
pub fn clear(&self) {
let ctx = UNDO_SCOPE_CTX.get();
let mut u = ctx.undo.lock();
u.clear();
ctx.redo.lock().clear();
}
/// If the undo stack is not empty.
pub fn can_undo(&self) -> bool {
!UNDO_SCOPE_CTX.get().undo.lock().is_empty()
}
/// If the redo stack is not empty.
pub fn can_redo(&self) -> bool {
!UNDO_SCOPE_CTX.get().redo.lock().is_empty()
}
/// Clones the timestamp and info of all entries in the current undo stack.
///
/// The latest undo action is the last entry in the list.
pub fn undo_stack(&self) -> UndoStackInfo {
UndoStackInfo::undo(&UNDO_SCOPE_CTX.get(), UNDO_INTERVAL_VAR.get())
}
/// Clones the timestamp and info of all entries in the current redo stack.
///
/// The latest undone action is the last entry in the list. Note that the
/// timestamp marks the moment the original undo registered the action, so the
/// newest timestamp is in the first entry.
pub fn redo_stack(&self) -> UndoStackInfo {
UndoStackInfo::redo(&UNDO_SCOPE_CTX.get(), UNDO_INTERVAL_VAR.get())
}
}
/// Snapshot of the undo or redo stacks in an [`UNDO`] scope.
#[derive(Clone)]
pub struct UndoStackInfo {
/// Clones the timestamp and info of all entries in the current undo stack.
///
/// In an undo list the latest undo action (first to undo) is the last entry in the list and has the latest timestamp.
///
/// In an redo list the latest undone action is the last entry (first to redo). Note that the
/// timestamp marks the moment the original undo registered the action, so the
/// newest timestamp is in the first entry for redo lists.
pub stack: Vec<(DInstant, Arc<dyn UndoInfo>)>,
/// Grouping interval.
pub undo_interval: Duration,
}
impl UndoStackInfo {
fn undo(ctx: &UndoScope, undo_interval: Duration) -> Self {
Self {
stack: ctx.undo.lock().iter_mut().map(|e| (e.timestamp, e.action.info())).collect(),
undo_interval,
}
}
fn redo(ctx: &UndoScope, undo_interval: Duration) -> Self {
Self {
stack: ctx.redo.lock().iter_mut().map(|e| (e.timestamp, e.action.info())).collect(),
undo_interval,
}
}
/// Iterate over the `stack`, grouped by `undo_interval`.
pub fn iter_groups(&self) -> impl DoubleEndedIterator<Item = &[(DInstant, Arc<dyn UndoInfo>)]> {
struct Iter<'a> {
stack: &'a [(DInstant, Arc<dyn UndoInfo>)],
interval: Duration,
ts_inverted: bool,
}
impl<'a> Iterator for Iter<'a> {
type Item = &'a [(DInstant, Arc<dyn UndoInfo>)];
fn next(&mut self) -> Option<Self::Item> {
if self.stack.is_empty() {
None
} else {
let mut older = self.stack[0].0;
let mut r = self.stack;
if let Some(i) = self.stack.iter().position(|(newer, _)| {
let (a, b) = if self.ts_inverted { (older, *newer) } else { (*newer, older) };
let break_ = a.saturating_duration_since(b) > self.interval;
older = *newer;
break_
}) {
r = &self.stack[..i];
self.stack = &self.stack[i..];
} else {
self.stack = &[];
}
Some(r)
}
}
}
impl DoubleEndedIterator for Iter<'_> {
fn next_back(&mut self) -> Option<Self::Item> {
if self.stack.is_empty() {
None
} else {
let mut newer = self.stack[self.stack.len() - 1].0;
let mut r = self.stack;
if let Some(i) = self.stack.iter().rposition(|(older, _)| {
let (a, b) = if self.ts_inverted { (*older, newer) } else { (newer, *older) };
let break_ = a.saturating_duration_since(b) > self.interval;
newer = *older;
break_
}) {
let i = i + 1;
r = &self.stack[i..];
self.stack = &self.stack[..i];
} else {
self.stack = &[];
}
Some(r)
}
}
}
Iter {
stack: &self.stack,
interval: self.undo_interval,
ts_inverted: self.stack.len() > 1 && self.stack[0].0 > self.stack[self.stack.len() - 1].0,
}
}
}
/// Identifies var modify requests by undo/redo action.
///
/// See [`UNDO.watch_var`] for more details.
///
/// [`UNDO.watch_var`]: UNDO::watch_var
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct UndoVarModifyTag;
/// Metadata info about an action registered for undo action.
pub trait UndoInfo: Send + Sync + Any {
/// Short display description of the action that will be undone/redone.
fn description(&self) -> Txt;
/// Any extra metadata associated with the item. This can be a thumbnail of an image
/// edit action for example, or an icon.
///
/// Is empty by default.
fn meta(&self) -> StateMapRef<UNDO> {
StateMapRef::empty()
}
/// Into `Arc<dyn UndoInfo>` without double wrapping.
fn into_dyn(self) -> Arc<dyn UndoInfo>
where
Self: Sized,
{
Arc::new(self)
}
}
impl UndoInfo for Txt {
fn description(&self) -> Txt {
self.clone()
}
}
impl UndoInfo for BoxedVar<Txt> {
fn description(&self) -> Txt {
self.get()
}
}
impl UndoInfo for &'static str {
fn description(&self) -> Txt {
Txt::from_static(self)
}
}
impl UndoInfo for Arc<dyn UndoInfo> {
fn description(&self) -> Txt {
self.as_ref().description()
}
fn meta(&self) -> StateMapRef<UNDO> {
self.as_ref().meta()
}
fn into_dyn(self) -> Arc<dyn UndoInfo>
where
Self: Sized,
{
self
}
}
/// Represents a single undo action.
pub trait UndoAction: Send + Any {
/// Gets display info about the action that registered this undo.
fn info(&mut self) -> Arc<dyn UndoInfo>;
/// Undo action and returns a [`RedoAction`] that redoes it.
fn undo(self: Box<Self>) -> Box<dyn RedoAction>;
/// Access `dyn Any` methods.
fn as_any(&mut self) -> &mut dyn Any;
/// Try merge the `next` action with the previous `self`.
///
/// This is called when `self` is the latest registered action and `next` is registered.
///
/// This can be used to optimize high-volume actions, but note that [`UNDO.undo`] will undo all actions
/// within the [`UNDO.undo_interval`] of the previous, even if not merged, and merged actions always show as one action
/// for [`UNDO.undo_select`].
///
/// [`UNDO.undo_interval`]: UNDO::undo_interval
/// [`UNDO.undo_select`]: UNDO::undo_select
/// [`UNDO.undo`]: UNDO::undo
fn merge(self: Box<Self>, args: UndoActionMergeArgs) -> Result<Box<dyn UndoAction>, (Box<dyn UndoAction>, Box<dyn UndoAction>)>;
}
/// Arguments for [`UndoAction::merge`].
pub struct UndoActionMergeArgs {
/// The action that was registered after the one receiving this arguments.
pub next: Box<dyn UndoAction>,
/// Timestamp of the previous action registered.
pub prev_timestamp: DInstant,
/// If the `prev_timestamp` is within the [`UNDO.undo_interval`]. Undo actions
/// can choose to ignore this and merge anyway.
///
/// [`UNDO.undo_interval`]: UNDO::undo_interval
pub within_undo_interval: bool,
}
/// Represents a single redo action.
pub trait RedoAction: Send + Any {
/// Gets display info about the action that will be redone.
fn info(&mut self) -> Arc<dyn UndoInfo>;
/// Redo action and returns a [`UndoAction`] that undoes it.
fn redo(self: Box<Self>) -> Box<dyn UndoAction>;
}
/// Represents an undo/redo action.
///
/// This can be used to implement undo and redo in a single closure. See [`UNDO.register_op`] and
/// [`UNDO.run_op`] for more details.
///
/// [`UNDO.register_op`]: UNDO::register_op
/// [`UNDO.run_op`]: UNDO::run_op
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum UndoOp {
/// Undo the action.
Undo,
/// Redo the action.
Redo,
}
impl UndoOp {
/// Gets the command that represents the OP.
pub fn cmd(self) -> Command {
match self {
UndoOp::Undo => UNDO_CMD,
UndoOp::Redo => REDO_CMD,
}
}
}
/// Represents a full undo/redo action.
///
/// This can be used to implement undo and redo in a single closure. See [`UNDO.register_full_op`] and
/// [`UNDO.run_full_op`] for more details.
///
/// [`UNDO.register_full_op`]: UNDO::register_full_op
/// [`UNDO.run_full_op`]: UNDO::run_full_op
pub enum UndoFullOp<'r> {
/// Initialize data in the execution context.
///
/// This is called once before the initial `Op(UndoOp::Redo)` call, it
/// can be used to skip registering no-ops.
Init {
/// If the op must actually be executed.
///
/// This is `true` by default, if set to `false` the OP will be dropped without ever executing and
/// will not be registered for undo.
redo: &'r mut bool,
},
/// Normal undo/redo.
Op(UndoOp),
/// Collect display info.
Info {
/// Set this to respond.
///
/// If not set the info will be some generic "action" text.
info: &'r mut Option<Arc<dyn UndoInfo>>,
},
/// Try merge the `next_data` onto self data (at the undone state).
Merge {
/// Closure data for the next undo action.
///
/// The data can be from any full undo closure action, only merge if the data
/// indicates that it comes from actions that can be covered by the `self` closure.
next_data: &'r mut dyn Any,
/// Timestamp of the previous action registered.
prev_timestamp: DInstant,
/// If the `prev_timestamp` is within the [`UNDO.undo_interval`]. Undo actions
/// can choose to ignore this and merge anyway.
///
/// [`UNDO.undo_interval`]: UNDO::undo_interval
within_undo_interval: bool,
/// Set this to `true` if the next action can be dropped because the `self` closure
/// now also implements it.
merged: &'r mut bool,
},
}
impl fmt::Debug for UndoFullOp<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Init { .. } => f.debug_struct("Init").finish_non_exhaustive(),
Self::Op(arg0) => f.debug_tuple("Op").field(arg0).finish(),
Self::Info { .. } => f.debug_struct("Info").finish_non_exhaustive(),
Self::Merge { .. } => f.debug_struct("Merge").finish_non_exhaustive(),
}
}
}
/// Represents captured undo actions in an [`UNDO.transaction`] operation.
///
/// [`UNDO.transaction`]: UNDO::transaction
#[must_use = "dropping the transaction undoes all captured actions"]
pub struct UndoTransaction {
undo: Vec<UndoEntry>,
}
impl UndoTransaction {
/// If the transaction did not capture any undo action.
pub fn is_empty(&self) -> bool {
self.undo.is_empty()
}
/// Push all undo actions captured by the transaction into the current undo scope.
pub fn commit(mut self) {
let mut undo = mem::take(&mut self.undo);
let now = INSTANT.now();
for u in &mut undo {
u.timestamp = now;
}
let ctx = UNDO_SCOPE_CTX.get();
let mut ctx_undo = ctx.undo.lock();
if ctx_undo.is_empty() {
*ctx_undo = undo;
} else {
ctx_undo.extend(undo);
}
}
/// Push a single action in the current undo scope that undoes/redoes all the captured
/// actions in the transaction.
///
/// Note that this will register a group item even if the transaction is empty.
pub fn commit_group(mut self, info: impl UndoInfo) {
UNDO.register(UndoGroup {
info: info.into_dyn(),
undo: mem::take(&mut self.undo),
})
}
/// Cancel the transaction, undoes all captured actions.
///
/// This is the same as dropping the transaction.
pub fn undo(self) {
let _ = self;
}
}
impl Drop for UndoTransaction {
fn drop(&mut self) {
for undo in self.undo.drain(..).rev() {
let _ = undo.action.undo();
}
}
}
command! {
/// Represents the **undo** action.
///
/// # Param
///
/// If the command parameter is a `u32`, `Duration` or `DInstant` calls [`undo_select`], otherwise calls
/// [`undo`].
///
/// [`undo_select`]: UNDO::undo_select
/// [`undo`]: UNDO::undo
///
/// # Scope
///
/// You can use [`CommandUndoExt::undo_scoped`] to get a command variable that is always scoped on the
/// focused undo scope.
pub static UNDO_CMD = {
l10n!: true,
name: "Undo",
shortcut: [shortcut!(CTRL+'Z')],
icon: wgt_fn!(|_| ICONS.get("undo")),
};
/// Represents the **redo** action.
///
/// # Param
///
/// If the command parameter is a `u32`, `Duration` or `DInstant` calls [`redo_select`], otherwise calls
/// [`redo`].
///
/// [`redo_select`]: UNDO::redo_select
/// [`redo`]: UNDO::redo
pub static REDO_CMD = {
l10n!: true,
name: "Redo",
shortcut: [shortcut!(CTRL+'Y')],
icon: wgt_fn!(|_| ICONS.get("redo")),
};
/// Represents the **clear history** action.
///
/// Implementers call [`clear`] in the undo scope.
///
/// [`clear`]: UNDO::clear
pub static CLEAR_HISTORY_CMD = {
l10n!: true,
name: "Clear History",
};
}
/// Represents a widget undo scope.
///
/// See [`UNDO.with_scope`] for more details.
///
/// [`UNDO.with_scope`]: UNDO::with_scope
pub struct WidgetUndoScope(Option<Arc<UndoScope>>);
impl WidgetUndoScope {
/// New, not inited in a widget.
pub const fn new() -> Self {
Self(None)
}
/// if the scope is already inited in a widget.
pub fn is_inited(&self) -> bool {
self.0.is_some()
}
/// Init the scope in the [`WIDGET`].
///
/// [`WIDGET`]: zng_app::widget::WIDGET
pub fn init(&mut self) {
let mut scope = UndoScope::default();
let id = WIDGET.id();
*scope.id.get_mut() = Some(id);
let scope = Arc::new(scope);
let wk_scope = Arc::downgrade(&scope);
let interval = UNDO_INTERVAL_VAR.actual_var();
UNDO_CMD
.scoped(id)
.with_meta(|m| m.set(*WEAK_UNDO_SCOPE_ID, (wk_scope.clone(), interval.clone())));
REDO_CMD.scoped(id).with_meta(|m| m.set(*WEAK_UNDO_SCOPE_ID, (wk_scope, interval)));
self.0 = Some(scope);
}
/// Sets the [`WIDGET`] info.
///
/// [`WIDGET`]: zng_app::widget::WIDGET
pub fn info(&mut self, info: &mut WidgetInfoBuilder) {
info.flag_meta(*FOCUS_SCOPE_ID);
}
/// Deinit the scope in the [`WIDGET`].
///
/// This clears the undo/redo stack of the scope.
///
/// [`WIDGET`]: zng_app::widget::WIDGET
pub fn deinit(&mut self) {
self.0 = None;
}
/// Sets if the undo/redo is enabled in this scope.
///
/// Is `true` by default.
pub fn set_enabled(&mut self, enabled: bool) {
self.0.as_ref().unwrap().enabled.store(enabled, Ordering::Relaxed);
}
/// Gets if the undo stack is not empty.
pub fn can_undo(&self) -> bool {
!self.0.as_ref().unwrap().undo.lock().is_empty()
}
/// Gets if the redo stack is not empty.
pub fn can_redo(&self) -> bool {
!self.0.as_ref().unwrap().redo.lock().is_empty()
}
}
impl Default for WidgetUndoScope {
fn default() -> Self {
Self::new()
}
}
struct UndoScope {
id: Atomic<Option<WidgetId>>,
undo: Mutex<Vec<UndoEntry>>,
redo: Mutex<Vec<RedoEntry>>,
enabled: AtomicBool,
}
impl Default for UndoScope {
fn default() -> Self {
Self {
id: Default::default(),
undo: Default::default(),
redo: Default::default(),
enabled: AtomicBool::new(true),
}
}
}
impl UndoScope {
fn with_enabled_undo_redo(&self, f: impl FnOnce(&mut Vec<UndoEntry>, &mut Vec<RedoEntry>)) {
let mut undo = self.undo.lock();
let mut redo = self.redo.lock();
let max_undo = if self.enabled.load(Ordering::Relaxed) {
UNDO_LIMIT_VAR.get() as usize
} else {
0
};
if undo.len() > max_undo {
undo.reverse();
while undo.len() > max_undo {
undo.pop();
}
undo.reverse();
}
if redo.len() > max_undo {
redo.reverse();
while redo.len() > max_undo {
redo.pop();
}
redo.reverse();
}
if max_undo > 0 {
f(&mut undo, &mut redo);
}
}
fn register(&self, action: Box<dyn UndoAction>) {
self.with_enabled_undo_redo(|undo, redo| {
let now = INSTANT.now();
if let Some(prev) = undo.pop() {
match prev.action.merge(UndoActionMergeArgs {
next: action,
prev_timestamp: prev.timestamp,
within_undo_interval: now.duration_since(prev.timestamp) <= UNDO_SV.read().undo_interval.get(),
}) {
Ok(merged) => undo.push(UndoEntry {
timestamp: now,
action: merged,
}),
Err((p, action)) => {
undo.push(UndoEntry {
timestamp: prev.timestamp,
action: p,
});
undo.push(UndoEntry { timestamp: now, action });
}
}
} else {
undo.push(UndoEntry { timestamp: now, action });
}
redo.clear();
});
}
fn undo_select(&self, selector: impl UndoSelector) {
let mut actions = vec![];
self.with_enabled_undo_redo(|undo, _| {
let mut select = selector.select(UndoOp::Undo);
while let Some(entry) = undo.last() {
if select.include(entry.timestamp) {
actions.push(undo.pop().unwrap());
} else {
break;
}
}
});
for undo in actions {
let redo = undo.action.undo();
self.redo.lock().push(RedoEntry {
timestamp: undo.timestamp,
action: redo,
});
}
}
fn redo_select(&self, selector: impl UndoSelector) {
let mut actions = vec![];
self.with_enabled_undo_redo(|_, redo| {
let mut select = selector.select(UndoOp::Redo);
while let Some(entry) = redo.last() {
if select.include(entry.timestamp) {
actions.push(redo.pop().unwrap());
} else {
break;
}
}
});
for redo in actions {
let undo = redo.action.redo();
self.undo.lock().push(UndoEntry {
timestamp: redo.timestamp,
action: undo,
});
}
}
fn id(&self) -> Option<WidgetId> {
self.id.load(Ordering::Relaxed)
}
}
struct UndoEntry {
timestamp: DInstant,
action: Box<dyn UndoAction>,
}
struct RedoEntry {
pub timestamp: DInstant,
pub action: Box<dyn RedoAction>,
}
struct UndoGroup {
info: Arc<dyn UndoInfo>,
undo: Vec<UndoEntry>,
}
impl UndoAction for UndoGroup {
fn undo(self: Box<Self>) -> Box<dyn RedoAction> {
let mut redo = Vec::with_capacity(self.undo.len());
for undo in self.undo.into_iter().rev() {
redo.push(RedoEntry {
timestamp: undo.timestamp,
action: undo.action.undo(),
});
}
Box::new(RedoGroup { info: self.info, redo })
}
fn info(&mut self) -> Arc<dyn UndoInfo> {
self.info.clone()
}
fn as_any(&mut self) -> &mut dyn Any {
self
}
fn merge(self: Box<Self>, args: UndoActionMergeArgs) -> Result<Box<dyn UndoAction>, (Box<dyn UndoAction>, Box<dyn UndoAction>)> {
Err((self, args.next))
}
}
struct RedoGroup {
info: Arc<dyn UndoInfo>,
redo: Vec<RedoEntry>,
}
impl RedoAction for RedoGroup {
fn redo(self: Box<Self>) -> Box<dyn UndoAction> {
let mut undo = Vec::with_capacity(self.redo.len());
for redo in self.redo.into_iter().rev() {
undo.push(UndoEntry {
timestamp: redo.timestamp,
action: redo.action.redo(),
});
}
Box::new(UndoGroup { info: self.info, undo })
}
fn info(&mut self) -> Arc<dyn UndoInfo> {
self.info.clone()
}
}
struct UndoRedoOp {
info: Arc<dyn UndoInfo>,
op: Box<dyn FnMut(UndoOp) + Send>,
}
impl UndoAction for UndoRedoOp {
fn undo(mut self: Box<Self>) -> Box<dyn RedoAction> {
(self.op)(UndoOp::Undo);
self
}
fn info(&mut self) -> Arc<dyn UndoInfo> {
self.info.clone()
}
fn as_any(&mut self) -> &mut dyn Any {
self
}
fn merge(self: Box<Self>, args: UndoActionMergeArgs) -> Result<Box<dyn UndoAction>, (Box<dyn UndoAction>, Box<dyn UndoAction>)> {
Err((self, args.next))
}
}
impl RedoAction for UndoRedoOp {
fn redo(mut self: Box<Self>) -> Box<dyn UndoAction> {
(self.op)(UndoOp::Redo);
self
}
fn info(&mut self) -> Arc<dyn UndoInfo> {
self.info.clone()
}
}
struct UndoRedoFullOp {
data: Box<dyn Any + Send>,
op: Box<dyn FnMut(&mut dyn Any, UndoFullOp) + Send>,
}
impl UndoAction for UndoRedoFullOp {
fn info(&mut self) -> Arc<dyn UndoInfo> {
let mut info = None;
(self.op)(&mut self.data, UndoFullOp::Info { info: &mut info });
info.unwrap_or_else(|| Arc::new("action"))
}
fn undo(mut self: Box<Self>) -> Box<dyn RedoAction> {
(self.op)(&mut self.data, UndoFullOp::Op(UndoOp::Undo));
self
}
fn merge(mut self: Box<Self>, mut args: UndoActionMergeArgs) -> Result<Box<dyn UndoAction>, (Box<dyn UndoAction>, Box<dyn UndoAction>)>
where
Self: Sized,
{
if let Some(u) = args.next.as_any().downcast_mut::<Self>() {
let mut merged = false;
(self.op)(
&mut self.data,
UndoFullOp::Merge {
next_data: &mut u.data,
prev_timestamp: args.prev_timestamp,
within_undo_interval: args.within_undo_interval,
merged: &mut merged,
},
);
if merged {
Ok(self)
} else {
Err((self, args.next))
}
} else {
Err((self, args.next))
}
}
fn as_any(&mut self) -> &mut dyn Any {
self
}
}
impl RedoAction for UndoRedoFullOp {
fn info(&mut self) -> Arc<dyn UndoInfo> {
let mut info = None;
(self.op)(&mut self.data, UndoFullOp::Info { info: &mut info });
info.unwrap_or_else(|| Arc::new("action"))
}
fn redo(mut self: Box<Self>) -> Box<dyn UndoAction> {
(self.op)(&mut self.data, UndoFullOp::Op(UndoOp::Redo));
self
}
}
struct UndoService {
undo_limit: BoxedVar<u32>,
undo_interval: BoxedVar<Duration>,
}
impl Default for UndoService {
fn default() -> Self {
Self {
undo_limit: var(u32::MAX).boxed(),
undo_interval: KEYBOARD.repeat_config().map(|c| c.start_delay + c.interval).cow().boxed(),
}
}
}
context_local! {
static UNDO_SCOPE_CTX: UndoScope = UndoScope::default();
}
app_local! {
static UNDO_SV: UndoService = UndoService::default();
}
/// Undo extension methods for widget info.
pub trait WidgetInfoUndoExt {
/// Returns `true` if the widget is an undo scope.
fn is_undo_scope(&self) -> bool;
/// Gets the first ancestor that is an undo scope.
fn undo_scope(&self) -> Option<WidgetInfo>;
}
impl WidgetInfoUndoExt for WidgetInfo {
fn is_undo_scope(&self) -> bool {
self.meta().flagged(*FOCUS_SCOPE_ID)
}
fn undo_scope(&self) -> Option<WidgetInfo> {
self.ancestors().find(WidgetInfoUndoExt::is_undo_scope)
}
}
static_id! {
static ref FOCUS_SCOPE_ID: StateId<()>;
}
/// Undo extension methods for commands.
pub trait CommandUndoExt {
/// Gets the command scoped in the undo scope widget that is or contains the focused widget, or
/// scoped on the app if there is no focused undo scope.
fn undo_scoped(self) -> BoxedVar<Command>;
/// Latest undo stack for the given scope, same as calling [`UNDO::undo_stack`] inside the scope.
fn undo_stack(self) -> UndoStackInfo;
/// Latest undo stack for the given scope, same as calling [`UNDO::redo_stack`] inside the scope.
fn redo_stack(self) -> UndoStackInfo;
}
impl CommandUndoExt for Command {
fn undo_scoped(self) -> BoxedVar<Command> {
self.focus_scoped_with(|w| match w {
Some(w) => {
if w.is_undo_scope() {
CommandScope::Widget(w.id())
} else if let Some(scope) = w.undo_scope() {
CommandScope::Widget(scope.id())
} else {
CommandScope::App
}
}
None => CommandScope::App,
})
}
fn undo_stack(self) -> UndoStackInfo {
let scope = self.with_meta(|m| m.get(*WEAK_UNDO_SCOPE_ID));
if let Some(scope) = scope {
if let Some(s) = scope.0.upgrade() {
return UndoStackInfo::undo(&s, scope.1.get());
}
}
if let CommandScope::App = self.scope() {
let mut r = UNDO_SCOPE_CTX.with_default(|| UNDO.undo_stack());
r.undo_interval = UNDO.undo_interval().get();
return r;
}
UndoStackInfo {
stack: vec![],
undo_interval: Duration::ZERO,
}
}
fn redo_stack(self) -> UndoStackInfo {
let scope = self.with_meta(|m| m.get(*WEAK_UNDO_SCOPE_ID));
if let Some(scope) = scope {
if let Some(s) = scope.0.upgrade() {
return UndoStackInfo::redo(&s, scope.1.get());
}
}
if let CommandScope::App = self.scope() {
let mut r = UNDO_SCOPE_CTX.with_default(|| UNDO.redo_stack());
r.undo_interval = UNDO.undo_interval().get();
return r;
}
UndoStackInfo {
stack: vec![],
undo_interval: Duration::ZERO,
}
}
}
static_id! {
static ref WEAK_UNDO_SCOPE_ID: StateId<(std::sync::Weak<UndoScope>, BoxedVar<Duration>)>;
}
/// Represents a type that can select actions for undo or redo once.
///
/// This API is sealed, only core crate can implement it.
///
/// See [`UNDO::undo_select`] for more details.
pub trait UndoSelector: crate::private::Sealed {
/// Selection collector.
type Select: UndoSelect;
/// Start selecting action for the `op`.
fn select(self, op: UndoOp) -> Self::Select;
}
/// Selects actions to undo or redo.
pub trait UndoSelect {
/// Called for each undo or redo action from the last item in the stack and back.
///
/// The `timestamp` is the moment the item was pushed in the undo stack, if this
/// function is called for [`UndoOp::Redo`] it will not be more recent than the next action.
fn include(&mut self, timestamp: DInstant) -> bool;
}
impl crate::private::Sealed for u32 {}
impl UndoSelector for u32 {
type Select = u32;
fn select(self, op: UndoOp) -> Self::Select {
let _ = op;
self
}
}
impl UndoSelect for u32 {
fn include(&mut self, _: DInstant) -> bool {
let i = *self > 0;
if i {
*self -= 1;
}
i
}
}
impl crate::private::Sealed for Duration {}
impl UndoSelector for Duration {
type Select = UndoSelectInterval;
fn select(self, op: UndoOp) -> Self::Select {
UndoSelectInterval {
prev: None,
interval: self,
op,
}
}
}
#[doc(hidden)]
pub struct UndoSelectInterval {
prev: Option<DInstant>,
interval: Duration,
op: UndoOp,
}
impl UndoSelect for UndoSelectInterval {
fn include(&mut self, timestamp: DInstant) -> bool {
if let Some(prev) = &mut self.prev {
let (older, newer) = match self.op {
UndoOp::Undo => (timestamp, *prev),
UndoOp::Redo => (*prev, timestamp),
};
if newer.saturating_duration_since(older) <= self.interval {
*prev = timestamp;
true
} else {
false
}
} else {
self.prev = Some(timestamp);
true
}
}
}
impl crate::private::Sealed for DInstant {}
impl UndoSelector for DInstant {
type Select = UndoSelectLtEq;
fn select(self, op: UndoOp) -> Self::Select {
UndoSelectLtEq { instant: self, op }
}
}
#[doc(hidden)]
pub struct UndoSelectLtEq {
instant: DInstant,
op: UndoOp,
}
impl UndoSelect for UndoSelectLtEq {
fn include(&mut self, timestamp: DInstant) -> bool {
match self.op {
UndoOp::Undo => timestamp >= self.instant,
UndoOp::Redo => timestamp <= self.instant,
}
}
}
#[cfg(test)]
mod tests {
use zng_app::APP;
use super::*;
#[test]
fn register() {
let _a = APP.minimal();
let data = Arc::new(Mutex::new(vec![1, 2]));
UNDO.register(PushAction {
data: data.clone(),
item: 1,
});
UNDO.register(PushAction {
data: data.clone(),
item: 2,
});
assert_eq!(&[1, 2], &data.lock()[..]);
UNDO.undo_select(1);
assert_eq!(&[1], &data.lock()[..]);
UNDO.undo_select(1);
assert_eq!(&[] as &[u8], &data.lock()[..]);
UNDO.redo_select(1);
assert_eq!(&[1], &data.lock()[..]);
UNDO.redo_select(1);
assert_eq!(&[1, 2], &data.lock()[..]);
}
fn push_1_2(data: &Arc<Mutex<Vec<u8>>>) {
UNDO.run_op(
"push 1",
clmv!(data, |op| match op {
UndoOp::Undo => assert_eq!(data.lock().pop(), Some(1)),
UndoOp::Redo => data.lock().push(1),
}),
);
UNDO.run_op(
"push 2",
clmv!(data, |op| match op {
UndoOp::Undo => assert_eq!(data.lock().pop(), Some(2)),
UndoOp::Redo => data.lock().push(2),
}),
);
}
#[test]
fn run_op() {
let _a = APP.minimal();
let data = Arc::new(Mutex::new(vec![]));
push_1_2(&data);
assert_eq!(&[1, 2], &data.lock()[..]);
UNDO.undo_select(1);
assert_eq!(&[1], &data.lock()[..]);
UNDO.undo_select(1);
assert_eq!(&[] as &[u8], &data.lock()[..]);
UNDO.redo_select(1);
assert_eq!(&[1], &data.lock()[..]);
UNDO.redo_select(1);
assert_eq!(&[1, 2], &data.lock()[..]);
}
#[test]
fn transaction_undo() {
let _a = APP.minimal();
let data = Arc::new(Mutex::new(vec![]));
let t = UNDO.transaction(|| {
push_1_2(&data);
});
assert_eq!(&[1, 2], &data.lock()[..]);
UNDO.undo_select(1);
assert_eq!(&[1, 2], &data.lock()[..]);
t.undo();
assert_eq!(&[] as &[u8], &data.lock()[..]);
}
#[test]
fn transaction_commit() {
let _a = APP.minimal();
let data = Arc::new(Mutex::new(vec![]));
let t = UNDO.transaction(|| {
push_1_2(&data);
});
assert_eq!(&[1, 2], &data.lock()[..]);
UNDO.undo_select(1);
assert_eq!(&[1, 2], &data.lock()[..]);
t.commit();
UNDO.undo_select(1);
assert_eq!(&[1], &data.lock()[..]);
UNDO.undo_select(1);
assert_eq!(&[] as &[u8], &data.lock()[..]);
UNDO.redo_select(1);
assert_eq!(&[1], &data.lock()[..]);
UNDO.redo_select(1);
assert_eq!(&[1, 2], &data.lock()[..]);
}
#[test]
fn transaction_group() {
let _a = APP.minimal();
let data = Arc::new(Mutex::new(vec![]));
let t = UNDO.transaction(|| {
push_1_2(&data);
});
assert_eq!(&[1, 2], &data.lock()[..]);
UNDO.undo_select(1);
assert_eq!(&[1, 2], &data.lock()[..]);
t.commit_group("push 1, 2");
UNDO.undo_select(1);
assert_eq!(&[] as &[u8], &data.lock()[..]);
UNDO.redo_select(1);
assert_eq!(&[1, 2], &data.lock()[..]);
}
fn push_1_sleep_2(data: &Arc<Mutex<Vec<u8>>>) {
UNDO.run_op(
"push 1",
clmv!(data, |op| match op {
UndoOp::Undo => assert_eq!(data.lock().pop(), Some(1)),
UndoOp::Redo => data.lock().push(1),
}),
);
std::thread::sleep(Duration::from_millis(100));
UNDO.run_op(
"push 2",
clmv!(data, |op| match op {
UndoOp::Undo => assert_eq!(data.lock().pop(), Some(2)),
UndoOp::Redo => data.lock().push(2),
}),
);
}
#[test]
fn undo_redo_t_zero() {
let _a = APP.minimal();
let data = Arc::new(Mutex::new(vec![]));
push_1_sleep_2(&data);
assert_eq!(&[1, 2], &data.lock()[..]);
UNDO.undo_select(Duration::ZERO);
assert_eq!(&[1], &data.lock()[..]);
UNDO.undo_select(Duration::ZERO);
assert_eq!(&[] as &[u8], &data.lock()[..]);
UNDO.redo_select(Duration::ZERO);
assert_eq!(&[1], &data.lock()[..]);
UNDO.redo_select(Duration::ZERO);
assert_eq!(&[1, 2], &data.lock()[..]);
}
#[test]
fn undo_redo_t_max() {
undo_redo_t_large(Duration::MAX);
}
#[test]
fn undo_redo_t_10s() {
undo_redo_t_large(Duration::from_secs(10));
}
fn undo_redo_t_large(t: Duration) {
let _a = APP.minimal();
let data = Arc::new(Mutex::new(vec![]));
push_1_sleep_2(&data);
assert_eq!(&[1, 2], &data.lock()[..]);
UNDO.undo_select(t);
assert_eq!(&[] as &[u8], &data.lock()[..]);
UNDO.redo_select(t);
assert_eq!(&[1, 2], &data.lock()[..]);
}
#[test]
fn watch_var() {
let mut app = APP.minimal().run_headless(false);
let test_var = var(0);
UNDO.watch_var("set test var", test_var.clone()).perm();
test_var.set(10);
app.update(false).assert_wait();
test_var.set(20);
app.update(false).assert_wait();
assert_eq!(20, test_var.get());
UNDO.undo_select(1);
app.update(false).assert_wait();
assert_eq!(10, test_var.get());
UNDO.undo_select(1);
app.update(false).assert_wait();
assert_eq!(0, test_var.get());
UNDO.redo_select(1);
app.update(false).assert_wait();
assert_eq!(10, test_var.get());
UNDO.redo_select(1);
app.update(false).assert_wait();
assert_eq!(20, test_var.get());
}
struct PushAction {
data: Arc<Mutex<Vec<u8>>>,
item: u8,
}
impl UndoAction for PushAction {
fn undo(self: Box<Self>) -> Box<dyn RedoAction> {
assert_eq!(self.data.lock().pop(), Some(self.item));
self
}
fn info(&mut self) -> Arc<dyn UndoInfo> {
Arc::new("push")
}
fn as_any(&mut self) -> &mut dyn Any {
self
}
fn merge(self: Box<Self>, args: UndoActionMergeArgs) -> Result<Box<dyn UndoAction>, (Box<dyn UndoAction>, Box<dyn UndoAction>)> {
Err((self, args.next))
}
}
impl RedoAction for PushAction {
fn redo(self: Box<Self>) -> Box<dyn UndoAction> {
self.data.lock().push(self.item);
self
}
fn info(&mut self) -> Arc<dyn UndoInfo> {
Arc::new("push")
}
}
}