diff options
Diffstat (limited to 'Xamarin.Forms.Platform.iOS/Renderers/SliderRenderer.cs')
-rw-r--r-- | Xamarin.Forms.Platform.iOS/Renderers/SliderRenderer.cs | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.iOS/Renderers/SliderRenderer.cs b/Xamarin.Forms.Platform.iOS/Renderers/SliderRenderer.cs new file mode 100644 index 00000000..2df61f2f --- /dev/null +++ b/Xamarin.Forms.Platform.iOS/Renderers/SliderRenderer.cs @@ -0,0 +1,99 @@ +using System; +using System.Drawing; +using System.ComponentModel; +#if __UNIFIED__ +using UIKit; +#else +using MonoTouch.UIKit; +#endif +#if __UNIFIED__ +using RectangleF = CoreGraphics.CGRect; +using SizeF = CoreGraphics.CGSize; +using PointF = CoreGraphics.CGPoint; + +#else +using nfloat=System.Single; +using nint=System.Int32; +using nuint=System.UInt32; +#endif + +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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