Add <icon> to UIToolkit, + picking mode & text outline (#128)

* adding support for <icon> to UIToolkit

* add TK styles for picking mode & text outline

* update font asset to include correct glyphs

---------

Co-authored-by: Gökhan Kurt <krtgkn@gmail.com>

Author: meeees

Assets/Material Icons/Material Icons SDF.asset

@@ -14,4 +14,5 @@ MonoBehaviour:
   m_EditorClassIdentifier: 
   Name: Material Icons
   FontAsset: {fileID: 11400000, guid: 2d3b5da16a7081c4b9d07980bc7922c7, type: 2}
+  ToolkitFontAsset: {fileID: 11400000, guid: f6206075b3056fc44a6a93f14f64c615, type: 2}
   Codepoints: {fileID: 4900000, guid: d8af46a16a86a264c9638732d5ecc1e4, type: 3}

Assets/Material Icons/Material Icons SDF.asset.meta

@@ -0,0 +1,60 @@
+using ReactUnity.Styling;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace ReactUnity.UIToolkit
+{
+    public class IconComponent : UIToolkitComponent<TextElement>, ITextComponent
+    {
+        public string Content => Element.text;
+        public IconSet Set { get; private set; }
+
+
+        public IconComponent(string text, UIToolkitContext context, string tag) : base(context, tag, true)
+        {
+            ApplySet(Context.DefaultIconSet);
+
+            if (text != null) SetText(text);
+        }
+
+        public void SetText(string text)
+        {
+            if(Set != null)
+            {
+                Element.text = Set.ConvertTextContent(text);
+            }
+            else
+            {
+                Element.text = text;
+            }
+        }
+
+        public override void SetProperty(string property, object value)
+        {
+            if (property == "set") ApplySet(value);
+            else base.SetProperty(property, value);
+        }
+
+        public void ApplySet(object value)
+        {
+            if (value == null)
+            {
+                Set = Context.DefaultIconSet;
+            }
+            else if (value is IconSet i) Set = i;
+            else
+            {
+                var str = value?.ToString();
+                if (Context.IconSets.TryGetValue(str, out var ic)) Set = ic;
+                else Set = null;
+            }
+
+            if (Set != null)
+            {
+                Element.style.unityFontDefinition = new StyleFontDefinition(Set.ToolkitFontAsset);
+                SetText(Element.text);
+
+            }
+        }
+    }
+}

Assets/Material Icons/Material Icons.asset

@@ -152,14 +152,15 @@ protected override void ApplyStylesSelf()
             TargetElement.style.letterSpacing = StylingHelpers.GetStyleFloat(computed, StyleProperties.letterSpacing).value;
             TargetElement.style.wordSpacing = StylingHelpers.GetStyleFloat(computed, StyleProperties.wordSpacing).value;
 #endif
+            TargetElement.style.unityTextOutlineColor = StylingHelpers.GetStyleColor(computed, StyleProperties.textStrokeColor).value;
+            TargetElement.style.unityTextOutlineWidth = StylingHelpers.GetStyleFloat(computed, StyleProperties.textStrokeWidth).value;
 
             if (computed.HasValue(StyleProperties.backgroundImage))
             {
                 var bg = computed.backgroundImage?.Get(0);
 
                 TargetElement.style.backgroundImage = null;
-                bg?.ResolveImage(Context, TargetElement.layout.size, tx =>
-                {
+                bg?.ResolveImage(Context, TargetElement.layout.size, tx => {
                     if (bg != ComputedStyle.backgroundImage?.Get(0)) return;
                     TargetElement.style.backgroundImage = tx?.Texture;
                 });
@@ -186,8 +187,7 @@ protected override void ApplyStylesSelf()
 
             if (computed.HasValue(StyleProperties.fontFamily))
             {
-                if (computed.fontFamily != null) computed.fontFamily?.Get(Context, x =>
-                {
+                if (computed.fontFamily != null) computed.fontFamily?.Get(Context, x => {
                     if (x?.Font != null)
                     {
                         TargetElement.style.unityFont = x.Font;
@@ -196,7 +196,8 @@ protected override void ApplyStylesSelf()
 #endif
                     }
 #if REACT_TMP
-                    else if (x?.TmpFontAsset != null) {
+                    else if (x?.TmpFontAsset != null)
+                    {
                         TargetElement.style.unityFont = x?.TmpFontAsset?.sourceFontFile;
 #if REACT_TEXTCORE
                         TargetElement.style.unityFontDefinition = FontDefinition.FromFont(x?.TmpFontAsset?.sourceFontFile);
@@ -293,6 +294,8 @@ protected override void ApplyStylesSelf()
 #endif
             }
             else TargetElement.transform.position = translate;
+
+            TargetElement.pickingMode = computed.pointerEvents == PointerEvents.None ? PickingMode.Ignore : PickingMode.Position;
         }
 
         protected override void DestroySelf()

Runtime/Frameworks/UIToolkit/Components/IconComponent.cs

@@ -1,5 +1,7 @@
 #if UNITY_2021_2_OR_NEWER
+using System.Collections.Generic;
 using ReactUnity.Scheduling;
+using ReactUnity.Styling;
 using ReactUnity.Styling.Rules;
 using UnityEngine;
 using UnityEngine.UIElements;
@@ -11,6 +13,8 @@ namespace ReactUnity.UIToolkit
     public class ReactRendererUIToolkit : ReactRendererBase
     {
         public VisualElement Root => GetComponent<UIDocument>()?.rootVisualElement;
+        public IconSet DefaultIconSet;
+        public List<IconSet> IconSets;
 
         protected override void ClearRoot()
         {
@@ -27,6 +31,8 @@ protected override ReactContext CreateContext(ScriptSource script)
                 Timer = Timer ?? UnscaledTimer.Instance,
                 MediaProvider = MediaProvider,
                 OnRestart = () => Render(),
+                IconSets = IconSets,
+                DefaultIconSet = DefaultIconSet,
                 OnAudioPlayback = PlayAudio,
                 EngineType = EngineType,
                 Debug = AdvancedOptions.DebugMode != DebugMode.None,

Runtime/Frameworks/UIToolkit/Components/IconComponent.cs.meta

@@ -14,6 +14,9 @@ public class UIToolkitContext : ReactContext
             public VisualElement HostElement;
             public Action<AudioClip, float, float> OnAudioPlayback;
             public override bool CalculatesLayout => false;
+
+            public List<IconSet> IconSets;
+            public IconSet DefaultIconSet;
         }
 
         public static Func<string, string, UIToolkitContext, IUIToolkitComponent<VisualElement>> defaultCreator =
@@ -42,6 +45,7 @@ public static Dictionary<string, Func<string, string, UIToolkitContext, IReactCo
                 { "style", (tag, text, context) => new Styling.StyleComponent(context, tag, text) },
                 { "script", (tag, text, context) => new Scripting.ScriptComponent(context, tag, text) },
                 { "html", (tag, text, context) => new Html.HtmlComponent(context, tag) },
+                { "icon", (tag, text, context) => new IconComponent(text, context, tag) },
 #if UNITY_2020_1_OR_NEWER
                 { "helpbox", (tag, text, context) => new UIToolkitComponent<HelpBox>(context, tag) }, // TODO
 #endif
@@ -69,6 +73,10 @@ public static Dictionary<string, Func<string, string, UIToolkitContext, IReactCo
                 { "hover", typeof(HoverStateHandler) },
             };
 
+        public IconSet DefaultIconSet { get; }
+        public Dictionary<string, IconSet> IconSets { get; } = new Dictionary<string, IconSet>() { };
+
+
         private Action<AudioClip, float, float> OnAudioPlayback = null;
 
         public VisualElement HostElement { get; }
@@ -77,6 +85,18 @@ public UIToolkitContext(Options options) : base(options)
         {
             OnAudioPlayback = options.OnAudioPlayback;
             HostElement = options.HostElement;
+
+            if (options.IconSets != null)
+            {
+                if (options.IconSets.Count > 0) IconSets["default"] = options.IconSets[0];
+                foreach (var ic in options.IconSets) IconSets[ic.Name] = ic;
+            }
+
+            DefaultIconSet = options.DefaultIconSet;
+            if (DefaultIconSet == null)
+            {
+                if (IconSets.TryGetValue("default", out var def)) DefaultIconSet = def;
+            }
         }
 
         public virtual void Initialize()

Runtime/Frameworks/UIToolkit/Components/UIToolkitComponent.cs

@@ -8,7 +8,10 @@ namespace ReactUnity.Styling
     public class IconSet : ScriptableObject
     {
         public string Name;
+        [Tooltip("For UGUI Use")]
         public TMPro.TMP_FontAsset FontAsset;
+        [Tooltip("For UIToolkit Use")]
+        public UnityEngine.TextCore.Text.FontAsset ToolkitFontAsset;
         public TextAsset Codepoints;
 
         [NonSerialized]