How do you achieve round edges for controls such as Entry, Editor and Picker for MAUI Android?

Question

This is my follow-up question to this one, and would like to know how to customize controls for corner smoothing effect using Maui Handlers.

Specifically, how do you apply Maui Handlers to achieve round corners for controls like Entry, Editor and Picker, same smooth effect you get with the CornerRadius property for Button control?

Answer 1

Hello,

It is recommended to use Border to customize controls for corner or shape.

For instance, you could setting the default Border style in Style.xaml as the following:

   <Style TargetType="Border">  
       <Setter Property="Stroke" Value="{AppThemeBinding Light={StaticResource Gray200}, Dark={StaticResource Gray500}}" />  
       <Setter Property="StrokeShape" Value="RoundRectangle 10,10,10,10"/>  
       <Setter Property="StrokeThickness" Value="1"/>  
   </Style>  

Then, you could use Border in your pages as:

   <Border >  
       <Entry/>  
   </Border>  

You could refer to Border to get more details.

Update:

You could also use handler to setting corners, please refer to the following code:

   Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping(nameof(IView.Background), (handler, view) =>   
           {  
               if (view is Entry)  
               {  
   #if ANDROID  
                   float[] outerRadii = { 20, 20, 20, 20, 20, 20, 20, 20 };  
                   RoundRectShape roundRectShape = new RoundRectShape(outerRadii, null, null);  
                   var shape = new Android.Graphics.Drawables.ShapeDrawable(roundRectShape);  
                   shape.Paint.Color = Android.Graphics.Color.Black;  
                   shape.Paint.StrokeWidth = 5;  
                   shape.Paint.SetStyle(Android.Graphics.Paint.Style.Stroke);  
                   handler.PlatformView.SetBackground(shape);  
                   handler.PlatformView.SetPadding(30, 30, 30, 30);  
   #elif IOS || MACCATALYST  
           ...  
   #elif WINDOWS  
           ...  
   #endif  
               }  
           });  

Update:

SetBackground and SetBackgroundColor can not work together, therefore, you need to use shape.Paint.SetStyle(Android.Graphics.Paint.Style.Fill); or shape.Paint.SetStyle(Android.Graphics.Paint.Style.FillAndStroke); to fill the background color.

Important: You need to use nameof(IView.Background), as your handle event name.

Best Regards,

Alec Liu.

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