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using System;
using Xamarin.Forms.Platform;
namespace Xamarin.Forms
{
[RenderWith(typeof(_SliderRenderer))]
public class Slider : View, IElementConfiguration<Slider>
{
public static readonly BindableProperty MinimumProperty = BindableProperty.Create("Minimum", typeof(double), typeof(Slider), 0d, validateValue: (bindable, value) =>
{
var slider = (Slider)bindable;
return (double)value < slider.Maximum;
}, coerceValue: (bindable, value) =>
{
var slider = (Slider)bindable;
slider.Value = slider.Value.Clamp((double)value, slider.Maximum);
return value;
});
public static readonly BindableProperty MaximumProperty = BindableProperty.Create("Maximum", typeof(double), typeof(Slider), 1d, validateValue: (bindable, value) =>
{
var slider = (Slider)bindable;
return (double)value > slider.Minimum;
}, coerceValue: (bindable, value) =>
{
var slider = (Slider)bindable;
slider.Value = slider.Value.Clamp(slider.Minimum, (double)value);
return value;
});
public static readonly BindableProperty ValueProperty = BindableProperty.Create("Value", typeof(double), typeof(Slider), 0d, BindingMode.TwoWay, coerceValue: (bindable, value) =>
{
var slider = (Slider)bindable;
return ((double)value).Clamp(slider.Minimum, slider.Maximum);
}, propertyChanged: (bindable, oldValue, newValue) =>
{
var slider = (Slider)bindable;
EventHandler<ValueChangedEventArgs> eh = slider.ValueChanged;
if (eh != null)
eh(slider, new ValueChangedEventArgs((double)oldValue, (double)newValue));
});
readonly Lazy<PlatformConfigurationRegistry<Slider>> _platformConfigurationRegistry;
public Slider()
{
_platformConfigurationRegistry = new Lazy<PlatformConfigurationRegistry<Slider>>(() => new PlatformConfigurationRegistry<Slider>(this));
}
public Slider(double min, double max, double val) : this()
{
if (min >= max)
throw new ArgumentOutOfRangeException("min");
if (max > Minimum)
{
Maximum = max;
Minimum = min;
}
else
{
Minimum = min;
Maximum = max;
}
Value = val.Clamp(min, max);
}
public double Maximum
{
get { return (double)GetValue(MaximumProperty); }
set { SetValue(MaximumProperty, value); }
}
public double Minimum
{
get { return (double)GetValue(MinimumProperty); }
set { SetValue(MinimumProperty, value); }
}
public double Value
{
get { return (double)GetValue(ValueProperty); }
set { SetValue(ValueProperty, value); }
}
public event EventHandler<ValueChangedEventArgs> ValueChanged;
public IPlatformElementConfiguration<T, Slider> On<T>() where T : IConfigPlatform
{
return _platformConfigurationRegistry.Value.On<T>();
}
}
}
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