Range Slider Interface

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace CustomSlider
{
   public class RangeSlider : View
    {
        public const string LowerValuePropertyName = "LowerValue";
        public const string MaximumValuePropertyName = "MaximumValue";
        public const string MinimumValuePropertyName = "MinimumValue";
        public const string UpperValuePropertyName = "UpperValue";
        public const string MinThumbHiddenPropertyName = "MinThumbHidden";
        public const string MaxThumbHiddenPropertyName = "MaxThumbHidden";
        public const string StepValuePropertyName = "StepValue";
        public const string StepValueContinuouslyPropertyName = "StepValueContinuously";
        public const string BarHeightPropertyName = "BarHeight";
        public const string ShowTextAboveThumbsPropertyName = "ShowTextAboveThumbs";
        public const string TextSizePropertyName = "TextSize";
        public const string TextFormatPropertyName = "TextFormat";
        public const string FormatLabelPropertyName = "FormatLabel";
        public const string ActiveColorPropertyName = "ActiveColor";
        public const string NormalColorPropertyName = "NormalColor";
        public const string SliderPropertyName = "SliderName";
        //public const string LowerThumbImagePropertyName = "LowerThumbImage";
        //public const string UpperThumbImagePropertyName = "UpperThumbImage";


        //public static BindableProperty LowerThumbImageProperty =
        // BindableProperty.Create(LowerThumbImagePropertyName, typeof(string), typeof(RangeSlider), null);

        //public static BindableProperty UpperThumbImageProperty =
        // BindableProperty.Create(UpperThumbImagePropertyName, typeof(string), typeof(RangeSlider), null);

        public static BindableProperty ActiveColorProperty =
            BindableProperty.Create(ActiveColorPropertyName, typeof(Color), typeof(RangeSlider), Color.FromRgb(0, 160, 212));

        public static BindableProperty NormalColorProperty =
            BindableProperty.Create(NormalColorPropertyName, typeof(Color), typeof(RangeSlider), Color.FromRgb(149, 208, 231));

        public static readonly BindableProperty LowerValueProperty =
            BindableProperty.Create(LowerValuePropertyName, typeof(float), typeof(RangeSlider), 0f);

        public static readonly BindableProperty MaximumValueProperty =
            BindableProperty.Create(MaximumValuePropertyName, typeof(float), typeof(RangeSlider), 0f);

        public static readonly BindableProperty MaxThumbHiddenProperty =
            BindableProperty.Create(MaxThumbHiddenPropertyName, typeof(bool), typeof(RangeSlider), false);

        public static readonly BindableProperty MinimumValueProperty =
            BindableProperty.Create(MinimumValuePropertyName, typeof(float), typeof(RangeSlider), 0f);

        public static readonly BindableProperty MinThumbHiddenProperty =
            BindableProperty.Create(MinThumbHiddenPropertyName, typeof(bool), typeof(RangeSlider), false);

        public static readonly BindableProperty StepValueContinuouslyProperty =
            BindableProperty.Create(StepValueContinuouslyPropertyName, typeof(bool), typeof(RangeSlider), false);

        public static readonly BindableProperty StepValueProperty =
            BindableProperty.Create(StepValuePropertyName, typeof(float), typeof(RangeSlider), 0f);

        public static readonly BindableProperty UpperValueProperty =
            BindableProperty.Create(UpperValuePropertyName, typeof(float), typeof(RangeSlider), 0f);

        public static readonly BindableProperty BarHeightProperty =
            BindableProperty.Create(BarHeightPropertyName, typeof(int), typeof(RangeSlider), 0);

        public static readonly BindableProperty ShowTextAboveThumbsProperty =
            BindableProperty.Create(ShowTextAboveThumbsPropertyName, typeof(bool), typeof(RangeSlider), false);

        public static readonly BindableProperty TextSizeProperty =
            BindableProperty.Create(TextSizePropertyName, typeof(double), typeof(RangeSlider), 10D);

        public static readonly BindableProperty TextFormatProperty =
            BindableProperty.Create(TextFormatPropertyName, typeof(string), typeof(RangeSlider), "F0");

        public static readonly BindableProperty FormatLabelProperty =
            BindableProperty.Create(FormatLabelPropertyName, typeof(Func<Thumb, float, string>), typeof(RangeSlider), null);


        public static readonly BindableProperty sliderNamePro =
          BindableProperty.Create(SliderPropertyName, typeof(string), typeof(RangeSlider), "F0");


        //public string LowerThumbImageValue
        //{
        // get { return (string)GetValue(LowerThumbImageProperty); }
        // set { SetValue(LowerThumbImageProperty, value); }
        //}

        //public string UpperThumbImageValue
        //{
        // get { return (string)GetValue(UpperThumbImageProperty); }
        // set { SetValue(UpperThumbImageProperty, value); }
        //}

        public Color ActiveColorValue
        {
            get { return (Color)GetValue(ActiveColorProperty); }
            set { SetValue(ActiveColorProperty, value); }
        }

        public string SliderNameValue
        {
            get { return (string)GetValue(sliderNamePro); }
            set { SetValue(sliderNamePro, value); }
        }
             

        public Color NormalColorValue
        {
            get { return (Color)GetValue(NormalColorProperty); }
            set { SetValue(NormalColorProperty, value); }
        }

        public float MinimumValue
        {
            get { return (float)GetValue(MinimumValueProperty); }
            set { SetValue(MinimumValueProperty, value); }
        }

        public float MaximumValue
        {
            get { return (float)GetValue(MaximumValueProperty); }
            set { SetValue(MaximumValueProperty, value); }
        }

        public float LowerValue
        {
            get { return (float)GetValue(LowerValueProperty); }
            set { SetValue(LowerValueProperty, value); }
        }

        public float UpperValue
        {
            get { return (float)GetValue(UpperValueProperty); }
            set { SetValue(UpperValueProperty, value); }
        }

        public bool MinThumbHidden
        {
            get { return (bool)GetValue(MinThumbHiddenProperty); }
            set { SetValue(MinThumbHiddenProperty, value); }
        }

        public bool MaxThumbHidden
        {
            get { return (bool)GetValue(MaxThumbHiddenProperty); }
            set { SetValue(MaxThumbHiddenProperty, value); }
        }

        public float StepValue
        {
            get { return (float)GetValue(StepValueProperty); }
            set { SetValue(StepValueProperty, value); }
        }

        public bool StepValueContinuously
        {
            get { return (bool)GetValue(StepValueContinuouslyProperty); }
            set { SetValue(StepValueContinuouslyProperty, value); }
        }

        public int? BarHeight
        {
            get { return (int?)GetValue(BarHeightProperty); }
            set { SetValue(BarHeightProperty, value); }
        }

        public bool ShowTextAboveThumbs
        {
            get { return (bool)GetValue(ShowTextAboveThumbsProperty); }
            set { SetValue(ShowTextAboveThumbsProperty, value); }
        }

        [TypeConverter(typeof(FontSizeConverter))]
        public double TextSize
        {
            get { return (double)GetValue(TextSizeProperty); }
            set { SetValue(TextSizeProperty, value); }
        }

        public string TextFormat
        {
            get { return (string)GetValue(TextFormatProperty); }
            set { SetValue(TextFormatProperty, value); }
        }

        public Func<Thumb, float, string> FormatLabel
        {
            get { return (Func<Thumb, float, string>)GetValue(FormatLabelProperty); }
            set { SetValue(FormatLabelProperty, value); }
        }

        public event EventHandler LowerValueChanged;
        public event EventHandler UpperValueChanged;
        public event EventHandler DragStarted;
        public event EventHandler DragCompleted;

        public void OnLowerValueChanged(float value)
        {
            LowerValue = value;
            LowerValueChanged?.Invoke(this, EventArgs.Empty);
        }

        public void OnUpperValueChanged(float value)
        {
            UpperValue = value;
            UpperValueChanged?.Invoke(this, EventArgs.Empty);
        }

        public void OnDragStarted()
        {
            DragStarted?.Invoke(this, EventArgs.Empty);
        }

        public void OnDragCompleted()
        {
            DragCompleted?.Invoke(this, EventArgs.Empty);
        }
    }
}