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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
| // See the LICENSE file in the project root for more information. | ||
|
|
||
| using System; | ||
| using Windows.UI.Xaml; | ||
| using Windows.UI.Xaml.Data; | ||
|
|
||
| namespace MicaDemo.Helpers.Converters | ||
| { | ||
| /// <summary> | ||
| /// This class converts a boolean value into an other object. | ||
| /// Can be used to convert true/false to visibility, a couple of colors, couple of images, etc. | ||
| /// </summary> | ||
| public partial class BoolToObjectConverter : DependencyObject, IValueConverter | ||
| { | ||
| /// <summary> | ||
| /// Identifies the <see cref="TrueValue"/> property. | ||
| /// </summary> | ||
| public static readonly DependencyProperty TrueValueProperty = | ||
| DependencyProperty.Register(nameof(TrueValue), typeof(object), typeof(BoolToObjectConverter), new PropertyMetadata(null)); | ||
|
|
||
| /// <summary> | ||
| /// Identifies the <see cref="FalseValue"/> property. | ||
| /// </summary> | ||
| public static readonly DependencyProperty FalseValueProperty = | ||
| DependencyProperty.Register(nameof(FalseValue), typeof(object), typeof(BoolToObjectConverter), new PropertyMetadata(null)); | ||
|
|
||
| /// <summary> | ||
| /// Gets or sets the value to be returned when the boolean is true | ||
| /// </summary> | ||
| public object TrueValue | ||
| { | ||
| get { return GetValue(TrueValueProperty); } | ||
| set { SetValue(TrueValueProperty, value); } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Gets or sets the value to be returned when the boolean is false | ||
| /// </summary> | ||
| public object FalseValue | ||
| { | ||
| get { return GetValue(FalseValueProperty); } | ||
| set { SetValue(FalseValueProperty, value); } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Convert a boolean value to an other object. | ||
| /// </summary> | ||
| /// <param name="value">The source data being passed to the target.</param> | ||
| /// <param name="targetType">The type of the target property, as a type reference.</param> | ||
| /// <param name="parameter">An optional parameter to be used to invert the converter logic.</param> | ||
| /// <param name="language">The language of the conversion.</param> | ||
| /// <returns>The value to be passed to the target dependency property.</returns> | ||
| public object Convert(object value, Type targetType, object parameter, string language) | ||
| { | ||
| bool boolValue = value is bool && (bool)value; | ||
|
|
||
| // Negate if needed | ||
| if (ConverterTools.TryParseBool(parameter)) | ||
| { | ||
| boolValue = !boolValue; | ||
| } | ||
|
|
||
| return ConverterTools.Convert(boolValue ? TrueValue : FalseValue, targetType); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Convert back the value to a boolean | ||
| /// </summary> | ||
| /// <remarks>If the <paramref name="value"/> parameter is a reference type, <see cref="TrueValue"/> must match its reference to return true.</remarks> | ||
| /// <param name="value">The target data being passed to the source.</param> | ||
| /// <param name="targetType">The type of the target property, as a type reference (System.Type for Microsoft .NET, a TypeName helper struct for Visual C++ component extensions (C++/CX)).</param> | ||
| /// <param name="parameter">An optional parameter to be used to invert the converter logic.</param> | ||
| /// <param name="language">The language of the conversion.</param> | ||
| /// <returns>The value to be passed to the source object.</returns> | ||
| public object ConvertBack(object value, Type targetType, object parameter, string language) | ||
| { | ||
| bool result = Equals(value, ConverterTools.Convert(TrueValue, value.GetType())); | ||
|
|
||
| if (ConverterTools.TryParseBool(parameter)) | ||
| { | ||
| result = !result; | ||
| } | ||
|
|
||
| return result; | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
| // See the LICENSE file in the project root for more information. | ||
|
|
||
| using Windows.UI.Xaml; | ||
|
|
||
| namespace MicaDemo.Helpers.Converters | ||
| { | ||
| /// <summary> | ||
| /// This class converts a boolean value into a Visibility enumeration. | ||
| /// </summary> | ||
| public class BoolToVisibilityConverter : BoolToObjectConverter | ||
| { | ||
| /// <summary> | ||
| /// Initializes a new instance of the <see cref="BoolToVisibilityConverter"/> class. | ||
| /// </summary> | ||
| public BoolToVisibilityConverter() | ||
| { | ||
| TrueValue = Visibility.Visible; | ||
| FalseValue = Visibility.Collapsed; | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| using System; | ||
| using System.Reflection; | ||
| using Windows.UI.Xaml.Markup; | ||
|
|
||
| namespace MicaDemo.Helpers.Converters | ||
| { | ||
| /// <summary> | ||
| /// Static class used to provide internal tools | ||
| /// </summary> | ||
| internal static class ConverterTools | ||
| { | ||
| /// <summary> | ||
| /// Helper method to safely cast an object to a boolean | ||
| /// </summary> | ||
| /// <param name="parameter">Parameter to cast to a boolean</param> | ||
| /// <returns>Bool value or false if cast failed</returns> | ||
| internal static bool TryParseBool(object parameter) | ||
| { | ||
| bool parsed = false; | ||
| if (parameter != null) | ||
| { | ||
| bool.TryParse(parameter.ToString(), out parsed); | ||
| } | ||
|
|
||
| return parsed; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Helper method to convert a value from a source type to a target type. | ||
| /// </summary> | ||
| /// <param name="value">The value to convert</param> | ||
| /// <param name="targetType">The target type</param> | ||
| /// <returns>The converted value</returns> | ||
| internal static object Convert(object value, Type targetType) | ||
| { | ||
| return targetType.IsInstanceOfType(value) ? value : XamlBindingHelper.ConvertValue(targetType, value); | ||
| } | ||
| } | ||
| } |
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