FontIconSource markup extension

Microsoft.Toolkit.Uwp.UI/Extensions/Markup/FontIconSourceExtension.cs

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+// 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.Text;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Markup;
+using Windows.UI.Xaml.Media;
+
+namespace Microsoft.Toolkit.Uwp.UI.Extensions
+{
+    /// <summary>
+    /// Custom <see cref="MarkupExtension"/> which can provide <see cref="FontIconSource"/> values.
+    /// </summary>
+    [Bindable]
+    [MarkupExtensionReturnType(ReturnType = typeof(FontIconSource))]
+    public class FontIconSourceExtension : MarkupExtension
+    {
+        /// <summary>
+        /// Gets or sets the <see cref="string"/> representing the icon to display.
+        /// </summary>
+        public string Glyph { get; set; }
+
+        /// <summary>
+        /// Gets or sets the size of the icon to display.
+        /// </summary>
+        public double FontSize { get; set; }
+
+        /// <summary>
+        /// Gets or sets the font family to use to display the icon. If <see langword="null"/>, "Segoe MDL2 Assets" will be used.
+        /// </summary>
+        public FontFamily FontFamily { get; set; }
+
+        /// <summary>
+        /// Gets or sets the thickness of the icon glyph.
+        /// </summary>
+        public FontWeight FontWeight { get; set; } = FontWeights.Normal;
+
+        /// <summary>
+        /// Gets or sets the font style for the icon glyph.
+        /// </summary>
+        public FontStyle FontStyle { get; set; } = FontStyle.Normal;
+
+        /// <summary>
+        /// Gets or sets a value indicating whether automatic text enlargement, to reflect the system text size setting, is enabled.
+        /// </summary>
+        public bool IsTextScaleFactorEnabled { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether the icon is mirrored when the flow direction is right to left.
+        /// </summary>
+        public bool MirroredWhenRightToLeft { get; set; }
+
+        /// <inheritdoc/>
+        protected override object ProvideValue()
+        {
+            var fontIcon = new FontIconSource
+            {
+                Glyph = Glyph,
+                FontFamily = FontFamily ?? new FontFamily("Segoe MDL2 Assets"),
+                FontWeight = FontWeight,
+                FontStyle = FontStyle,
+                IsTextScaleFactorEnabled = IsTextScaleFactorEnabled,
+                MirroredWhenRightToLeft = MirroredWhenRightToLeft
+            };
+
+            if (FontSize > 0)
+            {
+                fontIcon.FontSize = FontSize;
+            }
+
+            return fontIcon;
+        }
+    }
+}