Refactor Observatory

runtime/bin/vmservice/client/lib/src/observatory/chart.dart

-// Copyright (c) 2014, 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.
-
-part of observatory;
-
-class GoogleChart {
-  static var _api;
-
-  /// Get access to the JsObject containing the Google Chart API:
-  /// https://developers.google.com/chart/interactive/docs/reference
-  static get api {
-    return _api;
-  }
-
-  /// Load the Google Chart API. Returns a [Future] which completes
-  /// when the API is loaded.
-  static Future initOnce() {
-    Completer c = new Completer();
-    Logger.root.info('Loading Google Charts API');
-    context['google'].callMethod('load',
-        ['visualization', '1', new JsObject.jsify({
-          'packages': ['corechart', 'table'],
-          'callback': new JsFunction.withThis(c.complete)
-    })]);
-    return c.future.then(_initOnceOnComplete);
-  }
-
-  static _initOnceOnComplete(_) {
-    Logger.root.info('Google Charts API loaded');
-    _api = context['google']['visualization'];
-    assert(_api != null);
-    return _api;
-  }
-}
-
-class DataTable {
-  final _table = new JsObject(GoogleChart.api['DataTable']);
-  /// Construct a Google Chart DataTable.
-  DataTable();
-
-  /// Number of columns.
-  int get columns => _table.callMethod('getNumberOfColumns');
-  /// Number of rows.
-  int get rows => _table.callMethod('getNumberOfRows');
-
-  /// Add a new column with [type] and [label].
-  /// type must be: 'string', 'number', or 'boolean'.
-  void addColumn(String type, String label) {
-    _table.callMethod('addColumn', [type, label]);
-  }
-
-  /// Add a new column with [type], [label] and [role].
-  /// Roles are used for metadata such as 'interval' or 'annotation'.
-  /// type must be: 'string', 'number', or 'boolean'.
-  void addRoleColumn(String type, String label, String role) {
-    _table.callMethod('addColumn', [new JsObject.jsify({
-      'type': type,
-      'label': label,
-      'role': role,
-    })]);
-  }
-
-  /// Remove rows [start, end).
-  void removeRows(int start, int end) {
-    _table.callMethod('removeRows', [start, end]);
-  }
-
-  /// Remove all rows in the table.
-  void clearRows() {
-    removeRows(0, rows);
-  }
-
-  /// Adds a new row to the table. [row] must have an entry for each
-  /// column in the table.
-  void addRow(List row) {
-    _table.callMethod('addRow', [new JsArray.from(row)]);
-  }
-}
-
-class Chart {
-  var _chart;
-  final Map options = new Map();
-
-  /// Create a Google Chart of [chartType]. e.g. 'Table', 'BarChart', the
-  /// chart is rendered inside [element].
-  Chart(String chartType, Element element) {
-    _chart = new JsObject(GoogleChart.api[chartType], [element]);
-  }
-
-  /// When the user interacts with the table by clicking on columns,
-  /// you must call this function before [draw] so that we draw
-  /// with the current sort settings.
-  void refreshOptionsSortInfo() {
-    var props = _chart.callMethod('getSortInfo');
-    if ((props != null) && (props['column'] != -1)) {
-      // Preserve current sort settings.
-      options['sortColumn'] = props['column'];
-      options['sortAscending'] = props['ascending'];
-    }
-  }
-
-  /// Draw this chart using [table] and the current [options].
-  void draw(DataTable table) {
-    var jsOptions = new JsObject.jsify(options);
-    _chart.callMethod('draw', [table._table, jsOptions]);
-  }
-}