Roll Observatory packages and add a roll script

charted/lib/charts/src/chart_data_impl.dart

-//
-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-//
-
-part of charted.charts;
-
-class DefaultChartDataImpl extends ChangeNotifier implements ChartData {
-  Iterable<ChartColumnSpec> _columns;
-  Iterable<Iterable> _rows;
-
-  bool _hasObservableRows = false;
-  SubscriptionsDisposer _disposer = new SubscriptionsDisposer();
-
-  DefaultChartDataImpl(Iterable<ChartColumnSpec> columns, Iterable<Iterable> rows) {
-    this.columns = columns;
-    this.rows = rows;
-  }
-
-  set columns(Iterable<ChartColumnSpec> value) {
-    assert(value != null);
-
-    // Create a copy of columns.  We do not currently support
-    // changes to the list of columns.  Any changes to the spec
-    // will be applied at the next ChartBase.draw();
-    this._columns = new List<ChartColumnSpec>.from(value);
-  }
-
-  Iterable<ChartColumnSpec> get columns => _columns;
-
-  set rows(Iterable<Iterable> value) {
-    assert(value != null);
-
-    _rows = value;
-    if (_rows is ObservableList) {
-      _disposer.add(
-          (_rows as ObservableList).listChanges.listen(rowsChanged));
-    }
-
-    if (_rows.every((row) => row is ObservableList)) {
-      _hasObservableRows = true;
-      for (int i = 0; i < _rows.length; i++) {
-        var row = _rows.elementAt(i);
-        _disposer.add(row.listChanges.listen((changes)
-            => _valuesChanged(i, changes)), row);
-      };
-    } else if (_rows is Observable) {
-      logger.info('List of rows is Observable, but not rows themselves!');
-    }
-  }
-
-  Iterable<Iterable> get rows => _rows;
-
-  rowsChanged(List<ListChangeRecord> changes) {
-    if (_rows is! ObservableList) return;
-    notifyChange(new ChartRowChangeRecord(changes));
-
-    if (!_hasObservableRows) return;
-    changes.forEach((ListChangeRecord change) {
-      change.removed.forEach((item) => _disposer.unsubscribe(item));
-
-      for(int i = 0; i < change.addedCount; i++) {
-        var index = change.index + i,
-            row = _rows.elementAt(index);
-
-        if (row is! ObservableList) {
-          logger.severe('A non-observable row was added! '
-              'Changes on this row will not be monitored');
-        } else {
-          _disposer.add(row.listChanges.listen((changes)
-              => _valuesChanged(index, changes)), row);
-        }
-      }
-    });
-  }
-
-  _valuesChanged(int index, List<ListChangeRecord> changes) {
-    if (!_hasObservableRows) return;
-    notifyChange(new ChartValueChangeRecord(index, changes));
-  }
-
-  @override
-  String toString() {
-    var cellDataLength = new List.filled(rows.elementAt(0).length, 0);
-    for (var i = 0; i < columns.length; i++) {
-      if (cellDataLength[i] < columns.elementAt(i).label.toString().length) {
-        cellDataLength[i] = columns.elementAt(i).label.toString().length;
-      }
-    }
-    for (var row in rows) {
-      for (var i = 0; i < row.length; i++) {
-        if (cellDataLength[i] < row.elementAt(i).toString().length) {
-          cellDataLength[i] = row.elementAt(i).toString().length;
-        }
-      }
-    }
-
-    var totalLength = 1;  // 1 for the leading '|'.
-    for (var length in cellDataLength) {
-      // 3 for the leading and trailing ' ' padding and trailing '|'.
-      totalLength += length + 3;
-    }
-
-    // Second pass for building the string buffer and pad each cell with space
-    // according to the difference between cell string length and max length.
-    var strBuffer = new StringBuffer();
-    strBuffer.write('-' * totalLength + '\n');
-    strBuffer.write('|');
-
-    // Process columns.
-    for (var i = 0; i < columns.length; i++) {
-      var label = columns.elementAt(i).label;
-      var lengthDiff = cellDataLength[i] - label.length;
-      strBuffer.write(' ' * lengthDiff + ' ${label} |');
-    }
-    strBuffer.write('\n' + '-' * totalLength + '\n');
-
-    // Process rows.
-    for (var row in rows) {
-      strBuffer.write('|');
-      for (var i = 0; i < row.length; i++) {
-        var data = row.elementAt(i).toString();
-        var lengthDiff = cellDataLength[i] - data.length;
-        strBuffer.write(' ' * lengthDiff + ' ${data} |');
-
-        if (i == row.length - 1) {
-          strBuffer.write('\n' + '-' * totalLength + '\n');
-        }
-      }
-    }
-    return strBuffer.toString();
-  }
-}