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using System;
using System.ComponentModel;
using UIKit;
using SizeF = CoreGraphics.CGSize;
namespace Xamarin.Forms.Platform.iOS
{
public class SliderRenderer : ViewRenderer<Slider, UISlider>
{
SizeF _fitSize;
public override SizeF SizeThatFits(SizeF size)
{
return _fitSize;
}
protected override void Dispose(bool disposing)
{
if (Control != null)
Control.ValueChanged -= OnControlValueChanged;
base.Dispose(disposing);
}
protected override void OnElementChanged(ElementChangedEventArgs<Slider> e)
{
if (e.NewElement != null)
{
if (Control == null)
{
SetNativeControl(new UISlider { Continuous = true });
Control.ValueChanged += OnControlValueChanged;
// sliders SizeThatFits method returns non-useful answers
// this however gives a very useful answer
Control.SizeToFit();
_fitSize = Control.Bounds.Size;
// except if your not running iOS 7... then it fails...
if (_fitSize.Width <= 0 || _fitSize.Height <= 0)
_fitSize = new SizeF(22, 22); // Per the glorious documentation known as the SDK docs
}
UpdateMaximum();
UpdateMinimum();
UpdateValue();
}
base.OnElementChanged(e);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == Slider.MaximumProperty.PropertyName)
UpdateMaximum();
else if (e.PropertyName == Slider.MinimumProperty.PropertyName)
UpdateMinimum();
else if (e.PropertyName == Slider.ValueProperty.PropertyName)
UpdateValue();
}
void OnControlValueChanged(object sender, EventArgs eventArgs)
{
((IElementController)Element).SetValueFromRenderer(Slider.ValueProperty, Control.Value);
}
void UpdateMaximum()
{
Control.MaxValue = (float)Element.Maximum;
}
void UpdateMinimum()
{
Control.MinValue = (float)Element.Minimum;
}
void UpdateValue()
{
if ((float)Element.Value != Control.Value)
Control.Value = (float)Element.Value;
}
}
}
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