Roll Observatory packages and add a roll script

charted/lib/charts/behaviors/chart_tooltip.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;
-
-/// Displays tooltip for the values as user moves the mouse pointer over
-/// values in the chart. It displays all the active values in the data row
-/// and use the value in the dimension as the title.
-@Deprecated('Use Hovercard')
-class ChartTooltip implements ChartBehavior {
-  static const _TOOLTIP_OFFSET = 10;
-  final String orientation;
-  final bool showDimensionValue;
-  final bool showMeasureTotal;
-  final bool showSelectedMeasure;
-
-  ChartArea _area;
-  ChartState _state;
-  Selection _tooltipRoot;
-  SubscriptionsDisposer _disposer = new SubscriptionsDisposer();
-
-  /// Constructs the tooltip.
-  /// If [showDimensionValue] is set, displays the dimension value as title.
-  /// If [showMeasureTotal] is set, displays the total value.
-  ChartTooltip({
-      this.showSelectedMeasure: false,
-      this.showDimensionValue: false,
-      this.showMeasureTotal: false,
-      this.orientation: ORIENTATION_RIGHT});
-
-  /// Sets up listeners for triggering tooltip.
-  void init(ChartArea area, Selection _, Selection __) {
-    _area = area;
-    _state = area.state;
-    _disposer.addAll([
-        area.onValueMouseOver.listen(show),
-        area.onValueMouseOut.listen(hide)
-    ]);
-
-    // Tooltip requires host to be position: relative.
-    area.host.style.position = 'relative';
-
-    var _scope = new SelectionScope.element(_area.host);
-    _scope.append('div')..classed('tooltip');
-    _tooltipRoot = _scope.select('.tooltip');
-  }
-
-  void dispose() {
-    _disposer.dispose();
-    if (_tooltipRoot != null) _tooltipRoot.remove();
-  }
-
-  /// Displays tooltip upon receiving a hover event on an element in chart.
-  show(ChartEvent e) {
-    _tooltipRoot.first
-      ..children.clear()
-      ..attributes['dir'] = _area.config.isRTL ? 'rtl' : '';
-    _tooltipRoot.classed('rtl', _area.config.isRTL);
-
-    // Display dimension value if set in config.
-    if (showDimensionValue) {
-      var column = _area.config.dimensions.elementAt(0),
-          value = _area.data.rows.elementAt(e.row).elementAt(column),
-          formatter = _getFormatterForColumn(column);
-
-      _tooltipRoot.append('div')
-        ..classed('tooltip-title')
-        ..text((formatter != null) ? formatter(value) : value.toString());
-    }
-
-    // Display sum of the values in active row if set in config.
-    if (showMeasureTotal) {
-      var measures = e.series.measures,
-          formatter = _getFormatterForColumn(measures.elementAt(0)),
-          row = _area.data.rows.elementAt(e.row),
-          total = 0;
-      for (int i = 0, len = measures.length; i < len; i++) {
-        total += row.elementAt(measures.elementAt(i));
-      }
-      _tooltipRoot.append('div')
-        ..classed('tooltip-total')
-        ..text((formatter != null) ? formatter(total) : total.toString());
-    }
-
-    // Find the currently selectedMeasures and hoveredMeasures and show
-    // tooltip for them, if none is selected/hovered, show all.
-    var activeMeasures = [];
-    if (showSelectedMeasure) {
-      activeMeasures.addAll(_state.selection);
-      activeMeasures.add(_state.preview != null ? _state.preview :
-          _state.hovered.first);
-      if (activeMeasures.isEmpty) {
-        for (var series in _area.config.series) {
-          activeMeasures.addAll(series.measures);
-        }
-      }
-      activeMeasures.sort();
-    }
-
-    var data = (showSelectedMeasure) ? activeMeasures : e.series.measures;
-
-    // Create the tooltip items base on the number of measures in the series.
-    var items = _tooltipRoot.selectAll('.tooltip-item').
-        data(data);
-    items.enter.append('div')
-        ..classed('tooltip-item')
-        ..classedWithCallback('active', (d, i, c) =>
-            !showSelectedMeasure && (d == e.column));
-
-    // Display the label for the currently active series.
-    var tooltipItems = _tooltipRoot.selectAll('.tooltip-item');
-    tooltipItems.append('div')
-        ..classed('tooltip-item-label')
-        ..textWithCallback((d, i, c) => _area.data.columns.
-            elementAt((showSelectedMeasure) ? d :
-            e.series.measures.elementAt(i)).label);
-
-    // Display the value of the currently active series
-    tooltipItems.append('div')
-      ..classed('tooltip-item-value')
-      ..styleWithCallback('color', (d, i, c) =>
-          _area.theme.getColorForKey(d))
-      ..textWithCallback((d, i, c) {
-      var formatter = _getFormatterForColumn(d),
-          value = _area.data.rows.elementAt(e.row).elementAt(d);
-      return (formatter != null) ? formatter(value) : value.toString();
-    });
-
-    math.Point position = computeTooltipPosition(
-        new math.Point(e.chartX, e.chartY),
-            _tooltipRoot.first.getBoundingClientRect());
-
-    // Set position of the tooltip and display it.
-    _tooltipRoot
-      ..style('left', '${position.x}px')
-      ..style('top', '${position.y}px')
-      ..style('opacity', '1');
-  }
-
-  static String switchPositionDirection(String direction) =>
-      direction == ORIENTATION_LEFT
-          ? ORIENTATION_RIGHT
-          : ORIENTATION_LEFT;
-
-  /// Computes the ideal tooltip position based on orientation.
-  math.Point computeTooltipPosition(
-      math.Point coord, math.Rectangle rect) {
-    var x, y, direction;
-    direction = _area.config.isRTL && _area.config.switchAxesForRTL
-        ? switchPositionDirection(orientation)
-        : orientation;
-
-    if (direction == ORIENTATION_LEFT) {
-      x = coord.x - rect.width - _TOOLTIP_OFFSET;
-      y = coord.y + _TOOLTIP_OFFSET;
-    } else {
-      x = coord.x + _TOOLTIP_OFFSET;
-      y = coord.y + _TOOLTIP_OFFSET;
-    }
-    return boundTooltipPosition(
-        new math.Rectangle(x, y, rect.width, rect.height));
-  }
-
-  /// Positions the tooltip to be inside of the chart boundary.
-  math.Point boundTooltipPosition(math.Rectangle rect) {
-    var hostRect = _area.host.getBoundingClientRect();
-
-    var top = rect.top;
-    var left = rect.left;
-
-    // Checks top and bottom.
-    if (rect.top < 0) {
-      top += (2 * _TOOLTIP_OFFSET);
-    } else if (rect.top + rect.height > hostRect.height) {
-      top -= (rect.height + 2 * _TOOLTIP_OFFSET);
-    }
-
-    // Checks left and right.
-    if (rect.left < 0) {
-      left += (rect.width + 2 * _TOOLTIP_OFFSET);
-    } else if (rect.left + rect.width > hostRect.width) {
-      left -= (rect.width + 2 * _TOOLTIP_OFFSET);
-    }
-
-    return new math.Point(left, top);
-  }
-
-  FormatFunction _getFormatterForColumn(int column) =>
-      _area.data.columns.elementAt(column).formatter;
-
-  hide(ChartEvent e) {
-    if (_tooltipRoot == null) return;
-    _tooltipRoot.style('opacity', '0');
-  }
-}
-