Is there a set order in which the chart modifiers receive the touch event?

Hi Erika,

By default order of receiveing touch events is determined by their order in ChartModifiers collection. If you use ModifierGroup then when onTouch() method is called on this modifier it notifies its ChildModifiers by iterating over them in for loop and calling onTouch() on each child modifier. So to sum it up – if you have next modifiers in ChartModifiers:

• Modifier1
• ModifierGroup which ChildModifiers = [Modifier2, Modifier3, Modifier4]
• Modifier5

then onTouch() will be called for Modifier1, then for ModifierGroup ( ModifierGroup will call onTouch() for Modifier2, 3 and 4 ) and in the end for Modifier5.

Also for some modifiers ( such as gesture modifiers ) there could be delay caused by gesture detector. For example ZoomPanModifier doesn’t start scrolling immediately after receivent first touch event, because it performs analysis of touch event sequence to determine whether or no they form a scroll gesture.

BTW we have ReceiveHandledEvents property which allows modifier to process touch events even if they are already handled by other modifiers. By default it is set to false, but you can set it to true for RolloverModifier if you want it to receive events that are handled by SeriesSelectionModifier.

Best regards,
Yura