build method

@override Widget build(BuildContext context)

Describes the part of the user interface represented by this widget.

The framework calls this method in a number of different situations. For example:

• After calling initState.
• After calling didUpdateWidget.
• After receiving a call to setState.
• After a dependency of this State object changes.

Here it is called whenever the user interaction is performed and it removes the old widget and updates a chart with a new widget in SfFunnelChart.

Implementation

@override
Widget build(BuildContext context) {
  _prevSize = _prevSize ?? MediaQuery.of(context).size;
  _didSizeChange = _prevSize != MediaQuery.of(context).size;
  _prevSize = MediaQuery.of(context).size;
  _oldDeviceOrientation = _oldDeviceOrientation == null
      ? MediaQuery.of(context).orientation
      : _deviceOrientation;
  _deviceOrientation = MediaQuery.of(context).orientation;
  return RepaintBoundary(
      child: _ChartContainer(
          child: GestureDetector(
              child: Container(
                  decoration: BoxDecoration(
                      color: widget.backgroundColor,
                      image: widget.backgroundImage != null
                          ? DecorationImage(
                              image: widget.backgroundImage!,
                              fit: BoxFit.fill)
                          : null,
                      border: Border.all(
                          color: widget.borderColor,
                          width: widget.borderWidth)),
                  child: Column(
                    children: <Widget>[
                      _renderChartTitle(this),
                      _renderChartElements()
                    ],
                  )))));
}