How to change ChartModifier

Hi Tommy,

Thanks for writing to us.

Well nothing of this is available out of the box but you can create custom modifiers to provided desired behavior.

1. You can create a separate modifier which listens to touch event and when click occurs it enables CursorModifier:

   class ActivateCursorModifier extends GestureModifierBase {
   private final CursorModifier cursorModifier;
   
   ActivateCursorModifier(CursorModifier cursorModifier) {
       this.cursorModifier = cursorModifier;
   
       // intercept handled touch events
       setReceiveHandledEvents(true);
   
       // disable modifier
       cursorModifier.setIsEnabled(false);
   }
   
   @Override
   public boolean onSingleTapUp(MotionEvent e) {
       // enable modifier after click
       cursorModifier.setIsEnabled(true);
       return true;
   }
   }
   

2. You can customize CursorModifier to prevent hiding it’s tooltips and override its onTouchDown() which shows tooltips and onTouchUp() which hides tooltips:

   class CustomCursorModifier extends CursorModifier {
   private boolean isFirstTouch = true;
   
   @Override
   protected boolean onTouchDown(ModifierTouchEventArgs args) {
       // place tooltip on first touch only and ignore other touch down events because tooltip should remain on screen
       if(isFirstTouch) {
           isFirstTouch = false;
           return super.onTouchDown(args);
       } else
           super.onTouchMove(args);
       return true;
   
   }
   
   @Override
   protected boolean onTouchUp(ModifierTouchEventArgs args) {
       // ignore touch up event
       return false;
   }
   }
   

Is this suitable for your needs?

Hope it will help you.

Best regards,
Yura

Thanks! Your code is really helpful
May I ask how to modify the axis label of the cursor? I cannot find any public interface to change it