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using System; |
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using Xamarin.Forms; |
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using Xamarin.Forms.Xaml; |
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namespace Xamarin.Forms.Extensions |
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{ |
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// credits to: https://stackoverflow.com/a/841894/6884587 |
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[ContentProperty("Path")] |
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[AcceptEmptyServiceProvider] |
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public class SwitchBindingExtension : BindableObject, IMarkupExtension<BindingBase> |
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{ |
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private readonly BindingMode _mode = BindingMode.Default; |
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private BindingMode Mode => _mode; |
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public IValueConverter Converter { get; set; } |
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public object ConverterParameter { get; set; } |
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public string Path { get; set; } |
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public string StringFormat { get; set; } |
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public object Source { get; set; } |
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public object True |
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{ |
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get { return (object)this.GetValue(TrueProperty); } |
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set { this.SetValue(TrueProperty, value); } |
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} |
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public static readonly BindableProperty TrueProperty = |
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BindableProperty.Create( |
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propertyName: nameof(True), |
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returnType: typeof(object), |
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declaringType: typeof(SwitchBindingExtension), |
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defaultValue: null, |
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defaultBindingMode: BindingMode.TwoWay |
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); |
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public object False |
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{ |
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get { return (object)this.GetValue(FalseProperty); } |
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set { this.SetValue(FalseProperty, value); } |
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} |
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public static readonly BindableProperty FalseProperty = |
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BindableProperty.Create( |
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propertyName: nameof(False), |
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returnType: typeof(object), |
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declaringType: typeof(SwitchBindingExtension), |
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defaultValue: null, |
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defaultBindingMode: BindingMode.TwoWay |
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); |
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public BindingBase ProvideValue(IServiceProvider serviceProvider) |
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{ |
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var converter = new SwitchConverter(this, Converter); |
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return new Binding(Path, Mode, converter, ConverterParameter, StringFormat, Source); |
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} |
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object IMarkupExtension.ProvideValue(IServiceProvider serviceProvider) |
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{ |
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return ProvideValue(serviceProvider); |
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} |
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private class SwitchConverter : IValueConverter |
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{ |
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private SwitchBindingExtension _switchExtension; |
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private IValueConverter _decoratee; |
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public SwitchConverter(SwitchBindingExtension switchExtension, IValueConverter decoratee) |
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{ |
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_switchExtension = switchExtension; |
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_decoratee = decoratee; |
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} |
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public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) |
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{ |
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bool b = System.Convert.ToBoolean(value); |
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var switchedValue = b ? _switchExtension.True : _switchExtension.False; |
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return _decoratee == null ? switchedValue : _decoratee.Convert(switchedValue, targetType, parameter, culture); |
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} |
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public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) |
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{ |
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throw new NotImplementedException(); |
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} |
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} |
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} |
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} |
