69 lines
3.3 KiB
Plaintext
69 lines
3.3 KiB
Plaintext
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using System;
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using System.Globalization;
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using System.Windows.Data;
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namespace DTS.Common.Converters
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{
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/// <summary>
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/// This converter is used to bind a value to a group of radio buttons, and can be used with bool parameters only.
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/// It depends on the converter parameter, which maps a radio button to a specific value.
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/// </summary>
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///
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/// <remarks>
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/// <para>
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/// Notice the converter parameter.
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/// Its role is to make sure to get opposite values for the two radio buttons (when one is true, the other is false).
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/// --------------------------------------------------------------------------------------------------
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/// | value | param | result : (RadioButton.IsChecked = !(value ^ param)) where ^ is the XOR operator |
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/// --------------------------------------------------------------------------------------------------
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/// | true | true | true |
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/// | false | true | false |
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/// | true | false | false |
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/// | false | false | true |
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/// --------------------------------------------------------------------------------------------------
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/// </para>
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/// </remarks>
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[ValueConversion(typeof(bool?), typeof(bool))]
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public class RadioButtonCheckedConverter : IValueConverter
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{
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/// <summary>
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/// Maps a radio button to a specific value.
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/// </summary>
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/// <param name="value">The value produced by the binding source.</param>
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/// <param name="targetType">The target output type.</param>
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/// <param name="parameter">The converter parameter to use.</param>
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/// <param name="culture">The culture to use in the format operation.</param>
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/// <returns>
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/// <value>
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/// <see langword="true" /> if [value] and [parameter] have same values; otherwise <see langword="false" />.
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/// </value>
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/// </returns>
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public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
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{
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var param = bool.Parse(parameter.ToString());
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if (value == null)
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return false;
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return !((bool)value ^ param); // ^ is the XOR operator
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}
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/// <summary>
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/// Maps a radio button to a specific value.
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/// </summary>
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/// <param name="value">The value that is produced by the binding target.</param>
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/// <param name="targetType">This parameter is not used.</param>
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/// <param name="parameter">The converter parameter to use.</param>
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/// <param name="culture">This parameter is not used.</param>
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/// <returns>
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/// <value>
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/// <see langword="true" /> if [value] and [parameter] have same values; otherwise <see langword="false" />.
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/// </value>
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/// </returns>
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public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
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{
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var param = bool.Parse(parameter.ToString());
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return !((bool)value ^ param);
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}
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}
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}
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