How to repeat an action pressing a button

Question

Hi guys. I need that an action must be repeated when a button in pressed till it is realased. How can do this?
There is an API for this task? On under Nuget?

I beg the reader not to judge my english.

Thanks in advanced for any reply.

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

I need that an action must be repeated when a button in pressed till it is realased. How can do this?

You need to execute this operation by two steps.

Step1: monitor Button's Press and Release event.

You can achieve it by Buttons' custom renderer. then expose the underlying TouchDown and TouchUp events.

I create a custom button in Forms project with event handling.

   public class MyButton : Button  
       {  
           public event EventHandler ButtonPressed;  
           public event EventHandler ButtonReleased;  
     
           public virtual void OnPressed()  
           {  
               ButtonPressed?.Invoke(this, EventArgs.Empty);  
           }  
     
           public virtual void OnReleased()  
           {  
               ButtonReleased?.Invoke(this, EventArgs.Empty);  
           }  
       }  

Then create the Custom Renderer on each Platform.

For Android.

   [assembly: ExportRenderer(typeof(MyButton), typeof(MyButtonRenderer))]  
   namespace ButtonClickAndRelease.Droid  
   {  
       internal class MyButtonRenderer : ButtonRenderer  
       {  
           public MyButtonRenderer(Context context) : base(context)  
           {  
           }  
           protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e)  
           {  
               base.OnElementChanged(e);  
     
               var customButton = e.NewElement as MyButton;  
     
               var thisButton = Control as Android.Widget.Button;  
               thisButton.Touch += (object sender, TouchEventArgs args) =>  
               {  
                   if (args.Event.Action == MotionEventActions.Down)  
                   {  
                       customButton.OnPressed();  
                   }  
                   else if (args.Event.Action == MotionEventActions.Up)  
                   {  
                       customButton.OnReleased();  
                   }  
               };  
           }  
     
       }  
   }  

For iOS.

   [assembly: ExportRenderer(typeof(MyButton), typeof(MyButtonRenderer))]  
   namespace ButtonClickAndRelease.iOS  
   {  
       internal class MyButtonRenderer: ButtonRenderer  
       {  
           protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Button> e)  
           {  
               base.OnElementChanged(e);  
     
               var customButton = e.NewElement as MyButton;  
     
               var thisButton = Control as UIButton;  
               thisButton.TouchDown += delegate  
               {  
                   customButton.OnPressed();  
               };  
               thisButton.TouchUpInside += delegate  
               {  
                   customButton.OnReleased();  
               };  
           }  
       }  
   }  

In the end, we can consuming the Custom Control in Forms.

   <?xml version="1.0" encoding="utf-8" ?>  
   <ContentPage   
            ...  
                 xmlns:local="clr-namespace:ButtonClickAndRelease"  
               ....>  
     
      ...  
     
           <local:MyButton Text="test" ButtonPressed="MyButton_ButtonPressed" ButtonReleased="MyButton_ButtonReleased"></local:MyButton>  
      ...  
     
   </ContentPage>  

We need to add ButtonPressed and ButtonReleased in the layout's background code.

   private void MyButton_ButtonPressed(object sender, EventArgs e)  
           {  
                 
               // start your timer with _timer.Start();  
           }  
     
           private void MyButton_ButtonReleased(object sender, EventArgs e)  
           {  
            // stop your timer with   _timer.Stop();  
           }  

Step2: Execute your action repeatedly.

You can use System.Timers.Timer to execute your action repeatedly, please try to use this examples code.

Best Regards,

Leon Lu

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