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charted/lib/charts/behaviors/hovercard.dart

Index: charted/lib/charts/behaviors/hovercard.dart
diff --git a/charted/lib/charts/behaviors/hovercard.dart b/charted/lib/charts/behaviors/hovercard.dart
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index f01d2ac7292919990e427d4b0d3397b961ca9e3a..0000000000000000000000000000000000000000
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-//
-// 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;
-
-typedef Element HovercardBuilder(int column, int row);
-
-///
-/// Subscribe to events on the chart and display more information about the
-/// visualization that is hovered or highlighted.
-///
-/// This behavior supports two event modes:
-/// (1) State change: Subscribes to changes on ChartState
-/// (2) Mouse tracking: Subscribe to onValueMouseOver and onValueMouseOut
-///
-/// Supports two placement modes for mouse-tracking:
-/// (1) Place relative to mouse position
-/// (2) Place relative to the visualized measure value.
-///
-/// Supports two modes for displayed content:
-/// (1) Show all measure values at the current dimension value.
-/// (2) Show the hovered value only
-///
-/// Optionally, takes a builder that is passed row, column values that
-/// can be used to build custom tooltip
-///
-/// What makes the positioning logic complex?
-/// (1) Is this a CartesianArea?
-/// (2) Does the CartesianArea use two dimensions or just one?
-/// (3) Does the CartesianArea use "bands" along the axes?
-/// (4) How does measure correspond to positioning? Are the bars stacked?
-///
-/// So, how is the position computed?
-/// (1) Uses ChartConfig to figure out which renderers are being used, asks
-///     for extent of the row to roughly get the position along measure axis.
-/// (2) Position along dimension axes is computed separately based on how
-///     many dimensions are being used and if any of them use bands.
-///
-/// Constraints and known issues:
-/// (0) The implementation isn't complete yet! Specifically for CartesianArea
-///     that uses two axes.
-/// (1) Even with all the logic, single value mode does not work well
-///     with StackedBarChartRenderer
-/// (2) Only mouse relative positioning is supported on LayoutArea
-/// (3) Positioning only works for renderers that determine extent given a
-///     single row.  Eg: Would not work with a water-fall chart.
-///
-class Hovercard implements ChartBehavior {
-  final HovercardBuilder builder;
-
-  bool _isMouseTracking;
-  bool _isMultiValue;
-  bool _showDimensionTitle;
-  Iterable<int> _columnsToShow;
-
-  Iterable placementOrder =
-      const['orientation', 'top', 'right', 'bottom', 'left', 'orientation'];
-  int offset = 20;
-
-  ChartArea _area;
-  ChartState _state;
-  SubscriptionsDisposer _disposer = new SubscriptionsDisposer();
-
-  Element _hovercardRoot;
-
-  Hovercard({
-      bool isMouseTracking,
-      bool isMultiValue: false,
-      bool showDimensionTitle: false,
-      List columnsToShow: const [],
-      this.builder}) {
-    _isMouseTracking = isMouseTracking;
-    _isMultiValue = isMultiValue;
-    _showDimensionTitle = showDimensionTitle;
-    _columnsToShow = columnsToShow;
-  }
-
-  void init(ChartArea area, Selection _, Selection __) {
-    _area = area;
-    _state = area.state;
-
-    // If we don't have state, fall back to mouse events.
-    _isMouseTracking =
-        _isMouseTracking == true || _state == null || _area is LayoutArea;
-
-    // Subscribe to events.
-    if (_isMouseTracking) {
-      _disposer.addAll([
-          _area.onValueMouseOver.listen(_handleMouseOver),
-          _area.onValueMouseOut.listen(_handleMouseOut)
-      ]);
-    } else {
-      _disposer.add(_state.changes.listen(_handleStateChange));
-    }
-  }
-
-  void dispose() {
-    _disposer.dispose();
-    if (_hovercardRoot != null) _hovercardRoot.remove();
-  }
-
-  void _handleMouseOver(ChartEvent e) {
-    _ensureHovercard();
-    _hovercardRoot.children.clear();
-    _hovercardRoot.append(builder != null
-        ? builder(e.column, e.row)
-        : _createTooltip(e.column, e.row));
-    _hovercardRoot.style
-      ..visibility = 'visible'
-      ..opacity = '1.0';
-    _updateTooltipPosition(evt: e);
-  }
-
-  void _handleMouseOut(ChartEvent e) {
-    _ensureHovercard();
-    _hovercardRoot.style
-      ..visibility = 'hidden'
-      ..opacity = '$EPSILON';
-  }
-
-  void _handleStateChange(Iterable<ChangeRecord> changes) {
-    _ensureHovercard();
-
-    var value = _state.hovered;
-    if (_state.highlights.length == 1) {
-      value = _state.highlights.first;
-    }
-
-    if (value == null) {
-      _hovercardRoot.style
-        ..visibility = 'hidden'
-        ..opacity = '$EPSILON';
-    } else {
-      _hovercardRoot.children.clear();
-      _hovercardRoot.append(builder != null
-          ? builder(value.first, value.last)
-          : _createTooltip(value.first, value.last));
-      _hovercardRoot.style
-        ..visibility = 'visible'
-        ..opacity = '1.0';
-      _updateTooltipPosition(column: value.first, row: value.last);
-    }
-  }
-
-  void _ensureHovercard() {
-    if (_hovercardRoot != null) return;
-    _hovercardRoot = new Element.div();
-    _hovercardRoot.classes.add('hovercard');
-    if (_area.config.isRTL) {
-      _hovercardRoot.attributes['dir'] = 'rtl';
-      _hovercardRoot.classes.add('rtl');
-    }
-    _area.host.style.position = 'relative';
-    _area.host.append(_hovercardRoot);
-  }
-
-  void _updateTooltipPosition({ChartEvent evt, int column, int row}) {
-    assert(evt != null || column != null && row != null);
-    if (_isMouseTracking && evt != null) {
-      _positionAtMousePointer(evt);
-    } else if (_area is CartesianArea) {
-      if ((_area as CartesianArea).useTwoDimensionAxes) {
-        _positionOnTwoDimensionCartesian(column, row);
-      } else {
-        _positionOnSingleDimensionCartesian(column, row);
-      }
-    } else {
-      _positionOnLayout(column, row);
-    }
-  }
-
-  void _positionAtMousePointer(ChartEvent e) =>
-      _positionAtPoint(e.chartX, e.chartY, offset, offset, false, false);
-
-  void _positionOnLayout(column, row) {
-    // Currently for layouts, when hovercard is triggered due to change
-    // in ChartState, we render hovercard in the middle of layout.
-    // TODO: Get bounding rect from LayoutRenderer and position relative to it.
-  }
-
-  void _positionOnTwoDimensionCartesian(int column, int row) {
-    // TODO: Implement multi dimension positioning.
-  }
-
-  void _positionOnSingleDimensionCartesian(int column, int row) {
-    CartesianArea area = _area;
-    var dimensionCol = area.config.dimensions.first,
-        dimensionScale = area.dimensionScales.first,
-        measureScale = _getScaleForColumn(column),
-        dimensionOffset = this.offset,
-        dimensionCenterOffset = 0;
-
-    // If we are using bands on the one axis that is shown
-    // update position and offset accordingly.
-    if (area.dimensionsUsingBands.contains(dimensionCol)) {
-      assert(dimensionScale is OrdinalScale);
-      dimensionOffset = (dimensionScale as OrdinalScale).rangeBand / 2;
-      dimensionCenterOffset = dimensionOffset;
-    }
-
-    var rowData = area.data.rows.elementAt(row),
-        measurePosition = 0,
-        isNegative = false,
-        dimensionPosition = dimensionScale.scale(
-            rowData.elementAt(dimensionCol)) + dimensionCenterOffset;
-
-    if (_isMultiValue) {
-      var max = SMALL_INT_MIN,
-          min = SMALL_INT_MAX;
-      area.config.series.forEach((ChartSeries series) {
-        CartesianRenderer renderer = series.renderer;
-        Extent extent = renderer.extentForRow(rowData);
-        if (extent.min < min) min = extent.min;
-        if (extent.max > max) max = extent.max;
-        measurePosition = measureScale.scale(max);
-        isNegative = max < 0;
-      });
-    } else {
-      var value = rowData.elementAt(column);
-      isNegative = value < 0;
-      measurePosition = measureScale.scale(rowData.elementAt(column));
-    }
-
-    if (area.config.isLeftAxisPrimary) {
-      _positionAtPoint(measurePosition, dimensionPosition,
-          0, dimensionOffset, isNegative, true);
-    } else {
-      _positionAtPoint(dimensionPosition, measurePosition,
-          dimensionOffset, 0, isNegative, false);
-    }
-  }
-
-  void _positionAtPoint(num x, num y,
-      num xBand, num yBand, bool negative, [bool isLeftPrimary = false]) {
-    var rect = _hovercardRoot.getBoundingClientRect(),
-        width = rect.width,
-        height = rect.height,
-        scaleToHostY =
-            (_area.theme.padding != null ? _area.theme.padding.top : 0) +
-            (_area.layout.renderArea.y),
-        scaleToHostX =
-            (_area.theme.padding != null ? _area.theme.padding.start: 0) +
-            (_area.layout.renderArea.x),
-        renderAreaHeight = _area.layout.renderArea.height,
-        renderAreaWidth = _area.layout.renderArea.width;
-
-    if (scaleToHostY < 0) scaleToHostY = 0;
-    if (scaleToHostX < 0) scaleToHostX = 0;
-
-    num top = 0, left = 0;
-    for (int i = 0, len = placementOrder.length; i < len; ++i) {
-      String placement = placementOrder.elementAt(i);
-
-      // Place the popup based on the orientation.
-      if (placement == 'orientation') {
-        placement = isLeftPrimary ? 'right' : 'top';
-      }
-
-      if (placement == 'top') {
-        top = negative ? y + yBand : y - (height + yBand);
-        left = isLeftPrimary ? x - width : x - width / 2;
-      }
-      if (placement == 'right') {
-        top = isLeftPrimary ? y - height / 2 : y;
-        left = negative ? x - (width + xBand) : x + xBand;
-      }
-      if (placement == 'left') {
-        top = isLeftPrimary ? y - height / 2 : y;
-        left = negative ? x + xBand : x - (width + xBand);
-      }
-      if (placement == 'bottom') {
-        top = negative ? y - (height + yBand) : y + yBand;
-        left = isLeftPrimary ? x - width : x - width / 2;
-      }
-
-      // Check if the popup is contained in the RenderArea.
-      // If not, try other placements.
-      if (top > 0 && left > 0 &&
-          top + height < renderAreaHeight && left + width < renderAreaWidth) {
-        break;
-      }
-    }
-
-    _hovercardRoot.style
-      ..top = '${top + scaleToHostY}px'
-      ..left = '${left + scaleToHostX}px';
-  }
-
-  Element _createTooltip(int column, int row) {
-    var element = new Element.div();
-    if (_showDimensionTitle) {
-      var titleElement = new Element.div()
-        ..className = 'hovercard-title'
-        ..text = _getDimensionTitle(column, row);
-      element.append(titleElement);
-    }
-
-    var measureVals =  _getMeasuresData(column, row);
-    measureVals.forEach((ChartLegendItem item) {
-      var labelElement = new Element.div()
-            ..className = 'hovercard-measure-label'
-            ..text = item.label,
-          valueElement = new Element.div()
-            ..style.color = item.color
-            ..className = 'hovercard-measure-value'
-            ..text = item.value,
-          measureElement = new Element.div()
-            ..append(labelElement)
-            ..append(valueElement);
-
-      measureElement.className = _columnsToShow.length > 1 || _isMultiValue
-          ? 'hovercard-measure hovercard-multi'
-          : 'hovercard-measure hovercard-single';
-      element.append(measureElement);
-    });
-
-    return element;
-  }
-
-  Iterable<ChartLegendItem> _getMeasuresData(int column, int row) {
-    var measureVals = <ChartLegendItem>[];
-
-    if (_columnsToShow.isNotEmpty) {
-      _columnsToShow.forEach((int column) {
-        measureVals.add(_createHovercardItem(column, row));
-      });
-    } else if (_columnsToShow.length > 1 || _isMultiValue) {
-      var displayedCols = [];
-      _area.config.series.forEach((ChartSeries series) {
-        series.measures.forEach((int column) {
-          if (!displayedCols.contains(column)) displayedCols.add(column);
-        });
-      });
-      displayedCols.sort();
-      displayedCols.forEach((int column) {
-        measureVals.add(_createHovercardItem(column, row));
-      });
-    } else {
-      measureVals.add(_createHovercardItem(column, row));
-    }
-
-    return measureVals;
-  }
-
-  ChartLegendItem _createHovercardItem(int column, int row) {
-    var rowData = _area.data.rows.elementAt(row),
-        columns =  _area.data.columns,
-        spec = columns.elementAt(column),
-        colorKey = _area.useRowColoring ? row : column,
-        formatter = _getFormatterForColumn(column),
-        label = _area.useRowColoring
-            ? rowData.elementAt(_area.config.dimensions.first)
-            : spec.label;
-    return new ChartLegendItem(
-        label: label,
-        value: formatter(rowData.elementAt(column)),
-        color: _area.theme.getColorForKey(colorKey));
-  }
-
-  String _getDimensionTitle(int column, int row) {
-    var rowData = _area.data.rows.elementAt(row),
-        colSpec = _area.data.columns.elementAt(column);
-    if (_area.useRowColoring) {
-      return colSpec.label;
-    } else {
-      var count = (_area as CartesianArea).useTwoDimensionAxes ? 2 : 1,
-          dimensions = _area.config.dimensions.take(count);
-      return dimensions.map(
-          (int c) =>
-              _getFormatterForColumn(c)(rowData.elementAt(c))).join(', ');
-    }
-  }
-
-  // TODO: Move this to a common place?
-  Scale _getScaleForColumn(int column) {
-    var series = _area.config.series.firstWhere(
-        (ChartSeries x) => x.measures.contains(column), orElse: () => null);
-    return series != null
-        ? (_area as CartesianArea).measureScales(series).first
-        : null;
-  }
-
-  // TODO: Move this to a common place?
-  FormatFunction _getFormatterForColumn(int column) {
-    var formatter = _area.data.columns.elementAt(column).formatter;
-    if (formatter == null && _area is CartesianArea) {
-      var scale = _getScaleForColumn(column);
-      if (scale != null) {
-        formatter = scale.createTickFormatter();
-      }
-    }
-    if (formatter == null) {
-      // Formatter function must return String.  Default to identity function
-      // but return the toString() instead.
-      formatter = (x) => x.toString();
-    }
-    return formatter;
-  }
-}