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androidxamarinwin-universal-appxamarin.formsportable-class-library

Custom renderer for button


I am pulling my hair with this one. I am trying to create a custom renderer in using Xamarin Forms (Portable Class Library-PCL) to get the result showing in image below:

enter image description here

What I need:

  1. Rounded corners
  2. Button apperance (showing touch)
  3. "Normal" button label in center
  4. Image in the right corner
  5. Smaller text in the lower left.

I have managed to create a custom renderer for a normal button but not being able to add the small text and the image. See image below

enter image description here

Thanks!


Solution

  • Here is the solution for UWP for anyone interested!

    [assembly: ExportRenderer(typeof(RoundedButton), typeof(RoundedButtonRenderer))]
    namespace Platformspecific.Buttons
    {
        public class RoundedButtonRenderer : ViewRenderer<RoundedButton, Windows.UI.Xaml.Shapes.Rectangle>
        {
            Xamarin.Forms.Color originalBackground;
            private RoundedButton _control;
    
            protected override void OnElementChanged(ElementChangedEventArgs<RoundedButton> e)
            {
                base.OnElementChanged(e);
    
                if (e.NewElement != null)
                {
                    _control = e.NewElement as RoundedButton;
    
                    originalBackground = _control.CustomBackgroundColor;
    
                    this.PointerPressed += Control_Pressed;
                    this.PointerReleased += Control_Released;
                    this.PointerExited += Control_Released;
    
                    var rectangle = new Windows.UI.Xaml.Shapes.Rectangle();
                    rectangle.Width = this.Width; // 100;
                    rectangle.Height = this.Height;
    
    
                    rectangle.Fill = new SolidColorBrush(ToMediaColor(_control.CustomBackgroundColor)); 
    
                    rectangle.RadiusX = _control.BorderRadius;
                    rectangle.RadiusY = _control.BorderRadius;
    
    
    
                    rectangle.Stroke = new SolidColorBrush(ToMediaColor(_control.OutlineColor));
                    rectangle.StrokeThickness = _control.BorderWidth;
    
                    this.SetNativeControl(rectangle);
    
    
                }
            }
    
    
            public static Windows.UI.Color ToMediaColor(Xamarin.Forms.Color color)
            {
                return Windows.UI.Color.FromArgb(((byte)(color.A * 255)), (byte)(color.R * 255), (byte)(color.G * 255), (byte)(color.B * 255));
            }
    
    
            void Control_Pressed(object sender, PointerRoutedEventArgs e)
            {
    
    
                Windows.UI.Xaml.Shapes.Rectangle _rectangle = e.OriginalSource  as Windows.UI.Xaml.Shapes.Rectangle;
    
    
                var rectangle = new Windows.UI.Xaml.Shapes.Rectangle();
                rectangle.Width = this.Width; 
                rectangle.Height = this.Height;
                rectangle.Fill = new SolidColorBrush(Windows.UI.Color.FromArgb(255, 100, 100, 100));
                rectangle.RadiusX = _control.BorderRadius;
                rectangle.RadiusY = _control.BorderRadius;
                rectangle.Stroke = new SolidColorBrush(ToMediaColor(_control.OutlineColor));
                rectangle.StrokeThickness = _control.BorderWidth;
    
                this.SetNativeControl(rectangle);
    
                e.Handled = false;
            }
    
            void Control_Released(object sender, PointerRoutedEventArgs e)
            {
    
                Windows.UI.Xaml.Shapes.Rectangle _rectangle = e.OriginalSource as Windows.UI.Xaml.Shapes.Rectangle;
    
    
                var rectangle = new Windows.UI.Xaml.Shapes.Rectangle();
                rectangle.Width = this.Width; 
                rectangle.Height = this.Height;
                rectangle.Fill = new SolidColorBrush(Windows.UI.Color.FromArgb(((byte)(originalBackground.A * 255)), (byte)(originalBackground.R * 255), (byte)(originalBackground.G * 255), (byte)(originalBackground.B * 255)));
                rectangle.RadiusX = _control.BorderRadius;
                rectangle.RadiusY = _control.BorderRadius;
                rectangle.Stroke = new SolidColorBrush(ToMediaColor(_control.OutlineColor));
                rectangle.StrokeThickness = _control.BorderWidth;
    
    
    
                rectangle.Fill = new SolidColorBrush(ToMediaColor(_control.CustomBackgroundColor)); 
                rectangle.Stroke = new SolidColorBrush(ToMediaColor(_control.CustomBackgroundColor)); 
    
    
                this.SetNativeControl(rectangle);
                e.Handled = false;
            }
    
    
        }
    }