3D Touch to Trigger Trackball

[Peter Cardenas]

Is 3D touch or Force Touch used for the trackball to get triggered on capable iOS devices by default? If so, how does one change it to be triggered by normal touch? If not, what is used to enable this feature?

[Lavanya Anaimuthu]

Hi Peter Cardenas, 

 

Thanks for using Syncfusion Support. 

 

We have achieved this requirement by extending the ChartTrackballBehavior TouchesMoved(NSSet touches, UIEvent uiEvent). 

 

Please refer the code snippet. 

 

Code snippet [C#]:   

public override void TouchesMoved(NSSet touches, UIEvent uiEvent) 

{ 

              base.TouchesMoved(touches, uiEvent); 

              UITouch touch = touches.AnyObject as UITouch; 

 

              if(touch != null) 

              { 

                             var force = touch.Force; 

                             var maxForce = touch.MaximumPossibleForce; 

 

                             if(force >= touch.MaximumPossibleForce/2) 

                             { 

                                           CoreGraphics.CGPoint point = touch.LocationInView(touch.View); 

                                           this.Show(point); 

                             } 

              } 

} 

 

 

 

We have prepared a sample based on your requirement. Please download the sample from the following location.    

    

Sample: http://www.syncfusion.com/downloads/support/forum/138368/ze/SimpleSample896703852 

    

Please let us know, if you need further assistance on this.      

    

Regards,    

Lavanya Anaimuthu.   

[Peter Cardenas]

I greatly thank you for your aid. How can I hide the trackball if the user is not touching the screen? Would the following work if I wanted to make the trackball show when touching the screen, and not show when the user is not touching the screen?

if (touch != null)
            {
                var force = touch.Force;
                var maxForce = touch.MaximumPossibleForce;

                if (force <= maxForce / 2)
                {
                    CoreGraphics.CGPoint point = touch.LocationInView(touch.View);
                    this.Show(point);
                }
            }

            else 
            {
                this.Hide();
            }  

[Peter Cardenas]

I have figured it out, sorry for the inconvenience.

[Michael Prabhu M]

Hi Peter, 

 

We are glad that you have found the solution, please let us know if you need any further assistance on this. 

 

Thanks, 

Michael