Roll Observatory packages and add a roll script

charted/lib/charts/src/chart_state_impl.dart

Index: charted/lib/charts/src/chart_state_impl.dart
diff --git a/charted/lib/charts/src/chart_state_impl.dart b/charted/lib/charts/src/chart_state_impl.dart
deleted file mode 100644
index 71c4afa3214d53058bf3b9e66449baa2db486642..0000000000000000000000000000000000000000
--- a/charted/lib/charts/src/chart_state_impl.dart
+++ /dev/null
@@ -1,133 +0,0 @@
-//
-// 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;
-
-///
-/// Model that maintains state of each visualization item. Each entry in the
-/// legend is considered one visualization item.
-/// - In [CartesianArea] it is always a column.
-/// - In [LayoutArea] renders choose either columns or rows.
-///
-class DefaultChartStateImpl extends ChangeNotifier implements ChartState {
-  final bool isMultiSelect;
-  final bool isMultiHighlight;
-  final bool isSelectOrHighlight;
-  final bool supportColumnSelection;
-  final bool supportColumnPreview;
-  final bool supportValueHighlight;
-  final bool supportValueHover;
-
-  LinkedHashSet<int> hidden = new LinkedHashSet<int>();
-
-  LinkedHashSet<int> selection = new LinkedHashSet<int>();
-  LinkedHashSet<Pair<int,int>> highlights = new LinkedHashSet<Pair<int,int>>();
-
-  Pair<int,int> _hovered;
-  int _preview;
-
-  DefaultChartStateImpl({
-    this.supportColumnSelection: true,
-    this.supportColumnPreview: true,
-    this.supportValueHighlight: true,
-    this.supportValueHover: true,
-    this.isMultiSelect: false,
-    this.isMultiHighlight: false,
-    this.isSelectOrHighlight: true});
-
-  set hovered(Pair<int,int> value) {
-    if (!this.supportValueHover) return null;
-    if (value != _hovered) {
-      _hovered = value;
-      notifyChange(new ChartHoverChangeRecord(_hovered));
-    }
-    return value;
-  }
-  Pair<int,int> get hovered => _hovered;
-
-  set preview(int value) {
-    if (!this.supportColumnPreview) return null;
-    if (value != _preview) {
-      _preview = value;
-      notifyChange(new ChartPreviewChangeRecord(_preview));
-    }
-    return value;
-  }
-  int get preview => _preview;
-
-  bool unhide(int id) {
-    if (hidden.contains(id)) {
-      hidden.remove(id);
-      notifyChange(new ChartVisibilityChangeRecord(unhide:id));
-    }
-    return true;
-  }
-
-  bool hide(int id) {
-    if (!hidden.contains(id)) {
-      hidden.add(id);
-      notifyChange(new ChartVisibilityChangeRecord(hide:id));
-    }
-    return false;
-  }
-
-  bool isVisible(int id) => !hidden.contains(id);
-
-  bool select(int id) {
-    if (!this.supportColumnSelection) return false;
-    if (!selection.contains(id)) {
-      if (!isMultiSelect) {
-        selection.clear();
-      }
-      if (isSelectOrHighlight) {
-        highlights.clear();
-      }
-      selection.add(id);
-      notifyChange(new ChartSelectionChangeRecord(add:id));
-    }
-    return true;
-  }
-
-  bool unselect(int id) {
-    if (selection.contains(id)) {
-      selection.remove(id);
-      notifyChange(new ChartSelectionChangeRecord(remove:id));
-    }
-    return false;
-  }
-
-  bool isSelected(int id) => selection.contains(id);
-
-  bool highlight(int column, int row) {
-    if (!this.supportValueHighlight) return false;
-    if (!isHighlighted(column, row)) {
-      if (!isMultiHighlight) {
-        highlights.clear();
-      }
-      if (isSelectOrHighlight) {
-        selection.clear();
-      }
-      var item = new Pair(column, row);
-      highlights.add(item);
-      notifyChange(new ChartHighlightChangeRecord(add: item));
-    }
-    return true;
-  }
-
-  bool unhighlight(int column, int row) {
-    if (isHighlighted(column, row)) {
-      var item = new Pair(column, row);
-      highlights.remove(item);
-      notifyChange(new ChartHighlightChangeRecord(remove: item));
-    }
-    return false;
-  }
-
-  bool isHighlighted(int column, int row) =>
-      highlights.any((x) => x.first == column && x.last == row);
-}