show method

void show(dynamic x, double y, [ String? xAxisName, String? yAxisName, ])

Displays the tooltip at the specified x and y-values.

*x & y - x & y point values at which the tooltip needs to be shown.

• xAxisName - name of the x axis the given point must be bind to.

• yAxisName - name of the y axis the given point must be bind to.

Implementation

void show(dynamic x, double y, [String? xAxisName, String? yAxisName]) {
  if (_stateProperties != null &&
      _stateProperties.chart is SfCartesianChart) {
    final dynamic chart = _stateProperties.chart;
    final RenderingDetails renderingDetails =
        _stateProperties.renderingDetails;
    final TooltipBehaviorRenderer tooltipBehaviorRenderer =
        renderingDetails.tooltipBehaviorRenderer;
    bool? isInsidePointRegion = false;
    ChartAxisRendererDetails? xAxisDetails, yAxisDetails;
    if (xAxisName != null && yAxisName != null) {
      for (final ChartAxisRenderer axisRenderer
          in _stateProperties.chartAxis.axisRenderersCollection) {
        final ChartAxisRendererDetails axisDetails =
            AxisHelper.getAxisRendererDetails(axisRenderer);
        if (axisDetails.name == xAxisName) {
          xAxisDetails = axisDetails;
        } else if (axisDetails.name == yAxisName) {
          yAxisDetails = axisDetails;
        }
      }
    } else {
      xAxisDetails = _stateProperties.chartAxis.primaryXAxisDetails;
      yAxisDetails = _stateProperties.chartAxis.primaryYAxisDetails;
    }
    final ChartLocation position = calculatePoint(
        (x is DateTime &&
                (xAxisDetails! is DateTimeCategoryAxisDetails) == false)
            ? x.millisecondsSinceEpoch
            : ((x is DateTime && xAxisDetails! is DateTimeCategoryAxisDetails)
                ? (xAxisDetails as DateTimeCategoryAxisDetails)
                    .labels
                    .indexOf(xAxisDetails.dateFormat.format(x))
                : ((x is String && xAxisDetails is CategoryAxisDetails)
                    ? xAxisDetails.labels.indexOf(x)
                    : x)),
        y,
        xAxisDetails!,
        yAxisDetails!,
        _stateProperties.requireInvertedAxis,
        null,
        _stateProperties.chartAxis.axisClipRect);
    for (int i = 0;
        i < _stateProperties.chartSeries.visibleSeriesRenderers.length;
        i++) {
      final SeriesRendererDetails seriesRendererDetails =
          SeriesHelper.getSeriesRendererDetails(
              _stateProperties.chartSeries.visibleSeriesRenderers[i]);
      if (seriesRendererDetails.visible! == true &&
          seriesRendererDetails.series.enableTooltip == true &&
          seriesRendererDetails.regionalData != null) {
        final double padding = (seriesRendererDetails.seriesType ==
                    'bubble' ||
                seriesRendererDetails.seriesType == 'scatter' ||
                seriesRendererDetails.seriesType.contains('column') == true ||
                seriesRendererDetails.seriesType.contains('bar') == true)
            ? 0
            : 15; // regional padding to detect smooth touch
        seriesRendererDetails.regionalData!
            .forEach((dynamic regionRect, dynamic values) {
          final Rect region = regionRect[0];
          final Rect paddedRegion = Rect.fromLTRB(
              region.left - padding,
              region.top - padding,
              region.right + padding,
              region.bottom + padding);
          if (paddedRegion.contains(Offset(position.x, position.y))) {
            isInsidePointRegion = true;
          }
        });
      }
    }
    if (chart.tooltipBehavior.builder != null && x != null) {
      renderingDetails.tooltipBehaviorRenderer._tooltipRenderingDetails
          .showTemplateTooltip(Offset(position.x, position.y));
    } else if (renderingDetails.tooltipBehaviorRenderer
            ._tooltipRenderingDetails.tooltipTemplate ==
        null) {
      final SfTooltipState? tooltipState =
          tooltipBehaviorRenderer._tooltipRenderingDetails.chartTooltipState;
      if (isInsidePointRegion ?? false) {
        tooltipBehaviorRenderer._tooltipRenderingDetails
            .showTooltip(position.x, position.y);
      } else {
        // To show tooltip when the position is out of point region.
        tooltipBehaviorRenderer._tooltipRenderingDetails.show = true;
        tooltipState?.needMarker = false;
        renderingDetails.tooltipBehaviorRenderer._tooltipRenderingDetails
            .showChartAreaTooltip(Offset(position.x, position.y),
                xAxisDetails, yAxisDetails, chart);
      }
    }
    tooltipBehaviorRenderer._tooltipRenderingDetails.isInteraction = false;
  }
}