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observe/lib/src/observable_list.dart

Index: observe/lib/src/observable_list.dart
diff --git a/observe/lib/src/observable_list.dart b/observe/lib/src/observable_list.dart
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index 912c4fc2a3ec1af0c04981671ac1c216041031c8..0000000000000000000000000000000000000000
--- a/observe/lib/src/observable_list.dart
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-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library observe.src.observable_list;
-
-import 'dart:async';
-import 'dart:collection' show ListBase, UnmodifiableListView;
-import 'package:observe/observe.dart';
-import 'list_diff.dart' show projectListSplices, calcSplices;
-
-/// Represents an observable list of model values. If any items are added,
-/// removed, or replaced, then observers that are listening to [changes]
-/// will be notified.
-class ObservableList<E> extends ListBase<E> with ChangeNotifier {
-  List<ListChangeRecord> _listRecords;
-
-  StreamController _listChanges;
-
-  /// The inner [List<E>] with the actual storage.
-  final List<E> _list;
-
-  /// Creates an observable list of the given [length].
-  ///
-  /// If no [length] argument is supplied an extendable list of
-  /// length 0 is created.
-  ///
-  /// If a [length] argument is supplied, a fixed size list of that
-  /// length is created.
-  ObservableList([int length])
-      : _list = length != null ? new List<E>(length) : <E>[];
-
-  /// Creates an observable list with the elements of [other]. The order in
-  /// the list will be the order provided by the iterator of [other].
-  factory ObservableList.from(Iterable<E> other) =>
-      new ObservableList<E>()..addAll(other);
-
-  /// The stream of summarized list changes, delivered asynchronously.
-  ///
-  /// Each list change record contains information about an individual mutation.
-  /// The records are projected so they can be applied sequentially. For
-  /// example, this set of mutations:
-  ///
-  ///     var model = new ObservableList.from(['a', 'b']);
-  ///     model.listChanges.listen((records) => records.forEach(print));
-  ///     model.removeAt(1);
-  ///     model.insertAll(0, ['c', 'd', 'e']);
-  ///     model.removeRange(1, 3);
-  ///     model.insert(1, 'f');
-  ///
-  /// The change records will be summarized so they can be "played back", using
-  /// the final list positions to figure out which item was added:
-  ///
-  ///     #<ListChangeRecord index: 0, removed: [], addedCount: 2>
-  ///     #<ListChangeRecord index: 3, removed: [b], addedCount: 0>
-  ///
-  /// [deliverChanges] can be called to force synchronous delivery.
-  Stream<List<ListChangeRecord>> get listChanges {
-    if (_listChanges == null) {
-      // TODO(jmesserly): split observed/unobserved notions?
-      _listChanges = new StreamController.broadcast(sync: true,
-          onCancel: () { _listChanges = null; });
-    }
-    return _listChanges.stream;
-  }
-
-  bool get hasListObservers =>
-      _listChanges != null && _listChanges.hasListener;
-
-  @reflectable int get length => _list.length;
-
-  @reflectable set length(int value) {
-    int len = _list.length;
-    if (len == value) return;
-
-    // Produce notifications if needed
-    _notifyChangeLength(len, value);
-    if (hasListObservers) {
-      if (value < len) {
-        _recordChange(new ListChangeRecord(this, value,
-            removed: _list.getRange(value, len).toList()));
-      } else {
-        _recordChange(new ListChangeRecord(this, len, addedCount: value - len));
-      }
-    }
-
-    _list.length = value;
-  }
-
-  @reflectable E operator [](int index) => _list[index];
-
-  @reflectable void operator []=(int index, E value) {
-    var oldValue = _list[index];
-    if (hasListObservers) {
-      _recordChange(new ListChangeRecord(this, index, addedCount: 1,
-          removed: [oldValue]));
-    }
-    _list[index] = value;
-  }
-
-  // Forwarders so we can reflect on the properties.
-  @reflectable bool get isEmpty => super.isEmpty;
-  @reflectable bool get isNotEmpty => super.isNotEmpty;
-
-  // TODO(jmesserly): should we support first/last/single? They're kind of
-  // dangerous to use in a path because they throw exceptions. Also we'd need
-  // to produce property change notifications which seems to conflict with our
-  // existing list notifications.
-
-  // The following methods are here so that we can provide nice change events.
-
-  void setAll(int index, Iterable<E> iterable) {
-    if (iterable is! List && iterable is! Set) {
-      iterable = iterable.toList();
-    }
-    var len = iterable.length;
-    if (hasListObservers && len > 0) {
-      _recordChange(new ListChangeRecord(this, index, addedCount: len,
-          removed: _list.getRange(index, len).toList()));
-    }
-    _list.setAll(index, iterable);
-  }
-
-  void add(E value) {
-    int len = _list.length;
-    _notifyChangeLength(len, len + 1);
-    if (hasListObservers) {
-      _recordChange(new ListChangeRecord(this, len, addedCount: 1));
-    }
-
-    _list.add(value);
-  }
-
-  void addAll(Iterable<E> iterable) {
-    int len = _list.length;
-    _list.addAll(iterable);
-
-    _notifyChangeLength(len, _list.length);
-
-    int added = _list.length - len;
-    if (hasListObservers && added > 0) {
-      _recordChange(new ListChangeRecord(this, len, addedCount: added));
-    }
-  }
-
-  bool remove(Object element) {
-    for (int i = 0; i < this.length; i++) {
-      if (this[i] == element) {
-        removeRange(i, i + 1);
-        return true;
-      }
-    }
-    return false;
-  }
-
-  void removeRange(int start, int end) {
-    _rangeCheck(start, end);
-    int rangeLength = end - start;
-    int len = _list.length;
-
-    _notifyChangeLength(len, len - rangeLength);
-    if (hasListObservers && rangeLength > 0) {
-      _recordChange(new ListChangeRecord(this, start,
-          removed: _list.getRange(start, end).toList()));
-    }
-
-    _list.removeRange(start, end);
-  }
-
-  void insertAll(int index, Iterable<E> iterable) {
-    if (index < 0 || index > length) {
-      throw new RangeError.range(index, 0, length);
-    }
-    // TODO(floitsch): we can probably detect more cases.
-    if (iterable is! List && iterable is! Set) {
-      iterable = iterable.toList();
-    }
-    int insertionLength = iterable.length;
-    // There might be errors after the length change, in which case the list
-    // will end up being modified but the operation not complete. Unless we
-    // always go through a "toList" we can't really avoid that.
-    int len = _list.length;
-    _list.length += insertionLength;
-
-    _list.setRange(index + insertionLength, this.length, this, index);
-    _list.setAll(index, iterable);
-
-    _notifyChangeLength(len, _list.length);
-
-    if (hasListObservers && insertionLength > 0) {
-      _recordChange(new ListChangeRecord(this, index,
-          addedCount: insertionLength));
-    }
-  }
-
-  void insert(int index, E element) {
-    if (index < 0 || index > length) {
-      throw new RangeError.range(index, 0, length);
-    }
-    if (index == length) {
-      add(element);
-      return;
-    }
-    // We are modifying the length just below the is-check. Without the check
-    // Array.copy could throw an exception, leaving the list in a bad state
-    // (with a length that has been increased, but without a new element).
-    if (index is! int) throw new ArgumentError(index);
-    _list.length++;
-    _list.setRange(index + 1, length, this, index);
-
-    _notifyChangeLength(_list.length - 1, _list.length);
-    if (hasListObservers) {
-      _recordChange(new ListChangeRecord(this, index, addedCount: 1));
-    }
-    _list[index] = element;
-  }
-
-
-  E removeAt(int index) {
-    E result = this[index];
-    removeRange(index, index + 1);
-    return result;
-  }
-
-  void _rangeCheck(int start, int end) {
-    if (start < 0 || start > this.length) {
-      throw new RangeError.range(start, 0, this.length);
-    }
-    if (end < start || end > this.length) {
-      throw new RangeError.range(end, start, this.length);
-    }
-  }
-
-  void _recordChange(ListChangeRecord record) {
-    if (!hasListObservers) return;
-
-    if (_listRecords == null) {
-      _listRecords = [];
-      scheduleMicrotask(deliverListChanges);
-    }
-    _listRecords.add(record);
-  }
-
-  void _notifyChangeLength(int oldValue, int newValue) {
-    notifyPropertyChange(#length, oldValue, newValue);
-    notifyPropertyChange(#isEmpty, oldValue == 0, newValue == 0);
-    notifyPropertyChange(#isNotEmpty, oldValue != 0, newValue != 0);
-  }
-
-  /// Deprecated. Name had a typo, use [discardListChanges] instead.
-  @deprecated
-  void discardListChages() => discardListChanges();
-
-  void discardListChanges() {
-    // Leave _listRecords set so we don't schedule another delivery.
-    if (_listRecords != null) _listRecords = [];
-  }
-
-  bool deliverListChanges() {
-    if (_listRecords == null) return false;
-    var records = projectListSplices(this, _listRecords);
-    _listRecords = null;
-
-    if (hasListObservers && !records.isEmpty) {
-      _listChanges.add(new UnmodifiableListView<ListChangeRecord>(records));
-      return true;
-    }
-    return false;
-  }
-
-  /// Calculates the changes to the list, if lacking individual splice mutation
-  /// information.
-  ///
-  /// This is not needed for change records produced by [ObservableList] itself,
-  /// but it can be used if the list instance was replaced by another list.
-  ///
-  /// The minimal set of splices can be synthesized given the previous state and
-  /// final state of a list. The basic approach is to calculate the edit
-  /// distance matrix and choose the shortest path through it.
-  ///
-  /// Complexity is `O(l * p)` where `l` is the length of the current list and
-  /// `p` is the length of the old list.
-  static List<ListChangeRecord> calculateChangeRecords(
-      List<Object> oldValue, List<Object> newValue) =>
-      calcSplices(newValue, 0, newValue.length, oldValue, 0, oldValue.length);
-
-  /// Updates the [previous] list using the change [records]. For added items,
-  /// the [current] list is used to find the current value.
-  static void applyChangeRecords(List<Object> previous, List<Object> current,
-      List<ListChangeRecord> changeRecords) {
-
-    if (identical(previous, current)) {
-      throw new ArgumentError("can't use same list for previous and current");
-    }
-
-    for (var change in changeRecords) {
-      int addEnd = change.index + change.addedCount;
-      int removeEnd = change.index + change.removed.length;
-
-      var addedItems = current.getRange(change.index, addEnd);
-      previous.replaceRange(change.index, removeEnd, addedItems);
-    }
-  }
-}