Refactor ObjectTree to functional component

dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/js/react.kt

@@ -1,17 +1,17 @@
 package hep.dataforge.js
 
-import react.RComponent
+import react.RBuilder
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
 
-fun <T> RComponent<*, *>.initState(init: () -> T): ReadWriteProperty<RComponent<*, *>, T> =
-    object : ReadWriteProperty<RComponent<*, *>, T> {
+fun <T> RBuilder.initState(init: () -> T): ReadWriteProperty<Any?, T> =
+    object : ReadWriteProperty<Any?, T> {
         val pair = react.useState(init)
-        override fun getValue(thisRef: RComponent<*, *>, property: KProperty<*>): T {
+        override fun getValue(thisRef: Any?, property: KProperty<*>): T {
             return pair.first
         }
 
-        override fun setValue(thisRef: RComponent<*, *>, property: KProperty<*>, value: T) {
+        override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
             pair.second(value)
         }
     }

dataforge-vis-common/src/jsMain/kotlin/hep/dataforge/vis/editor/ObjectTree.kt

@@ -1,6 +1,7 @@
 package hep.dataforge.vis.editor
 
 import hep.dataforge.js.card
+import hep.dataforge.js.initState
 import hep.dataforge.names.Name
 import hep.dataforge.names.plus
 import hep.dataforge.names.startsWith
@@ -25,20 +26,14 @@ interface TreeState : RState {
     var expanded: Boolean
 }
 
-class ObjectTree : RComponent<ObjectTreeProps, TreeState>() {
+private fun RBuilder.objectTree(props: ObjectTreeProps): Unit {
+    var expanded: Boolean by initState{ props.selected?.startsWith(props.name) ?: false }
 
-    override fun TreeState.init(props: ObjectTreeProps) {
-        expanded = props.selected?.startsWith(props.name) ?: false
-    }
-
-
-    private val onClick: (Event) -> Unit = {
-        setState {
+    val onClick: (Event) -> Unit = {
         expanded = !expanded
     }
-    }
 
-    private fun RBuilder.treeLabel(text: String) {
+    fun RBuilder.treeLabel(text: String) {
         button(classes = "btn btn-link tree-label p-0") {
             +text
             attrs {
@@ -50,7 +45,6 @@ class ObjectTree : RComponent<ObjectTreeProps, TreeState>() {
         }
     }
 
-    override fun RBuilder.render() {
     val token = props.name.last()?.toString() ?: "World"
     val obj = props.obj
 
@@ -60,7 +54,7 @@ class ObjectTree : RComponent<ObjectTreeProps, TreeState>() {
             if (obj.children.any { !it.key.body.startsWith("@") }) {
                 span("tree-caret") {
                     attrs {
-                            if (state.expanded) {
+                        if (expanded) {
                             classes += "tree-caret-down"
                         }
                         onClickFunction = onClick
@@ -69,14 +63,14 @@ class ObjectTree : RComponent<ObjectTreeProps, TreeState>() {
             }
             treeLabel(token)
         }
-            if (state.expanded) {
+        if (expanded) {
             ul("tree") {
                 obj.children.entries
                     .filter { !it.key.toString().startsWith("@") } // ignore statics and other hidden children
                     .sortedBy { (it.value as? VisualGroup)?.isEmpty ?: true }
                     .forEach { (childToken, child) ->
                         li("tree-item") {
-                                child(ObjectTree::class) {
+                            child(ObjectTree) {
                                 attrs {
                                     name = props.name + childToken
                                     this.obj = child
@@ -95,6 +89,9 @@ class ObjectTree : RComponent<ObjectTreeProps, TreeState>() {
         }
     }
 }
+
+val ObjectTree: FunctionalComponent<ObjectTreeProps> = functionalComponent { props ->
+    objectTree(props)
 }
 
 fun Element.renderObjectTree(
@@ -102,7 +99,7 @@ fun Element.renderObjectTree(
     clickCallback: (Name) -> Unit = {}
 ) = render(this) {
     card("Object tree") {
-        child(ObjectTree::class) {
+        child(ObjectTree) {
             attrs {
                 this.name = Name.EMPTY
                 this.obj = visualObject
@@ -118,7 +115,7 @@ fun RBuilder.objectTree(
     selected: Name? = null,
     clickCallback: (Name) -> Unit = {}
 ) {
-    child(ObjectTree::class) {
+    child(ObjectTree) {
         attrs {
             this.name = Name.EMPTY
             this.obj = visualObject