Line chart tooltip

[madhukesh048]

HI, Tooltip in line chart disappears after you lift the touch. I need to keep that tooltip on even after you release the touch. Is it possible to do?

[imaNNeo]

Hi,

You can customize the touch functionality
Check the below sample code:

ScatterChartSample 2 (Source Code)

[FMorschel]

Just passing here to help anyone who was also having some trouble in making this work. (Even following the example, maybe this should be mentioned somewhere in the docs?) The LineTouchData.handleBuiltInTouches parameter must be set to false.

[imaNNeo]

Yes, you're right. Can you please add it somewhere in the docs?

[FMorschel]

Sorry, but I'm not sure where would be the best place for it. Probably on the /// above the handleBuiltInTouches but somewhere else may be better or should appear in more than one place.

[imaNNeo]

I think it makes sense to add it on the touchCallbackdocs here:

fl_chart/lib/src/chart/base/base_chart/base_chart_data.dart

Lines 98 to 102 in 24d0fc5

	/// [touchCallback] notifies you about the happened touch/pointer events.
	/// It gives you a [FlTouchEvent] which is the happened event such as [FlPointerHoverEvent], [FlTapUpEvent], ...
	/// It also gives you a [BaseTouchResponse] which is the chart specific type and contains information
	/// about the elements that has touched.
	final BaseTouchCallback<R>? touchCallback;

Also, it would be nice if you add it in the chart subclasses such as Line, Bar, Pie, Scatter and Radar chart data.