New styling design

dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/vis/common/AbstractVisualGroup.kt

@@ -21,6 +21,7 @@ abstract class AbstractVisualGroup : AbstractVisualObject(), VisualGroup {
      */
     abstract override val children: Map<NameToken, VisualObject> //get() = _children
 
+
 //    init {
 //        //Do after deserialization
 //        children.values.forEach {

dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/vis/common/AbstractVisualObject.kt

@@ -1,8 +1,10 @@
 package hep.dataforge.vis.common
 
 import hep.dataforge.meta.*
+import hep.dataforge.names.EmptyName
 import hep.dataforge.names.Name
-import hep.dataforge.names.asName
+import hep.dataforge.names.toName
+import hep.dataforge.vis.common.VisualObject.Companion.STYLE_KEY
 import kotlinx.serialization.Transient
 
 internal data class PropertyListener(
@@ -15,17 +17,21 @@ abstract class AbstractVisualObject : VisualObject {
     @Transient
     override var parent: VisualObject? = null
 
-    override var style: Meta? = null
+    protected abstract var properties: Config?
+
+    override var style: List<String>
+        get() = properties?.let { it[STYLE_KEY].stringList } ?: emptyList()
         set(value) {
-            //notify about style removed
+            setProperty(VisualObject.STYLE_KEY, value)
-            style?.items?.forEach {(name, value) ->
-                propertyChanged(name.asName(), value, null)
-            }
-            field = value
-            //notify about style adition
-            value?.items?.forEach { (name, value) ->
-                propertyChanged(name.asName(), null, value)
         }
+
+    /**
+     * The config is initialized and assigned on-demand.
+     * To avoid unnecessary allocations, one should access [properties] via [getProperty] instead.
+     */
+    override val config: Config
+        get() = properties ?: Config().also { config ->
+            properties = config.apply { onChange(this, ::propertyChanged) }
         }
 
     @Transient
@@ -45,22 +51,32 @@ abstract class AbstractVisualObject : VisualObject {
         listeners.removeAll { it.owner == owner }
     }
 
-    protected abstract var properties: Config?
-
-    override val config: Config
-        get() = properties ?: Config().also { config ->
-            properties = config.apply { onChange(this, ::propertyChanged) }
-        }
-
     override fun setProperty(name: Name, value: Any?) {
         config[name] = value
     }
 
+    private var styleCache: Laminate? = null
+
+    private fun styles(): Laminate {
+        return styleCache ?: kotlin.run {
+            Laminate(style.map { it.toName() }.mapNotNull(::findStyle))
+                .also { styleCache = it }
+        }
+    }
+
+    /**
+     * Helper to reset style cache
+     */
+    protected fun styleChanged() {
+        styleCache = null
+        propertyChanged(EmptyName)
+    }
+
     override fun getProperty(name: Name, inherit: Boolean): MetaItem<*>? {
         return if (inherit) {
-            style?.get(name) ?: properties?.get(name) ?: parent?.getProperty(name, inherit)
+            properties?.get(name) ?: parent?.getProperty(name, inherit) ?: styles()[name]
         } else {
-            style?.get(name) ?: properties?.get(name)
+            properties?.get(name) ?: styles()[name]
         }
     }
 
@@ -72,3 +88,11 @@ abstract class AbstractVisualObject : VisualObject {
         updateMeta()
     }
 }
+
+internal fun VisualObject.findStyle(styleName: Name): Meta? {
+    if (this is VisualGroup) {
+        val style = getStyle(styleName)
+        if (style != null) return style
+    }
+    return parent?.findStyle(styleName)
+}

dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/vis/common/Colors.kt

@@ -1,5 +1,7 @@
 package hep.dataforge.vis.common
 
+import kotlin.math.max
+
 /**
  * Taken from https://github.com/markaren/three.kt/blob/master/threejs-wrapper/src/main/kotlin/info/laht/threekt/math/ColorConstants.kt
  */
@@ -177,6 +179,6 @@ object Colors {
 
     fun rgbToString(rgb: Int): String {
         val string = rgb.toString(16)
-        return "#" + string.substring(string.length - 6)
+        return "#" + string.substring(max(0, string.length - 6))
     }
 }

dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/vis/common/VisualGroup.kt

@@ -1,5 +1,6 @@
 package hep.dataforge.vis.common
 
+import hep.dataforge.meta.Meta
 import hep.dataforge.names.*
 import hep.dataforge.provider.Provider
 
@@ -11,17 +12,18 @@ interface VisualGroup : VisualObject, Provider, Iterable<VisualObject> {
 
     override val defaultTarget: String get() = VisualObject.TYPE
 
-    override fun provideTop(target: String): Map<Name, VisualObject> = if (target == VisualObject.TYPE) {
+    override fun provideTop(target: String): Map<Name, Any> =
-        children.flatMap { (key, value) ->
+        when (target) {
-            val res: Map<Name, VisualObject> = if (value is VisualGroup) {
+            VisualObject.TYPE -> children.flatMap { (key, value) ->
+                val res: Map<Name, Any> = if (value is VisualGroup) {
                     value.provideTop(target).mapKeys { key + it.key }
                 } else {
                     mapOf(key.asName() to value)
                 }
                 res.entries
             }.associate { it.toPair() }
-    } else {
+            //TODO add styles
-        emptyMap()
+            else -> emptyMap()
         }
 
     /**
@@ -30,7 +32,20 @@ interface VisualGroup : VisualObject, Provider, Iterable<VisualObject> {
     override fun iterator(): Iterator<VisualObject> = children.values.iterator()
 
     /**
-     * Add listener for children change
+     * Resolve style by its name
+     * TODO change to Config?
+     */
+    fun getStyle(name: Name): Meta?
+
+    /**
+     * Add or replace style with given name
+     */
+    fun setStyle(name: Name, meta: Meta)
+
+    /**
+     * Add listener for children structure change.
+     * @param owner the handler to properly remove listeners
+     * @param action First argument of the action is the name of changed child. Second argument is the new value of the object.
      */
     fun onChildrenChange(owner: Any?, action: (Name, VisualObject?) -> Unit)
 

dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/vis/common/VisualObject.kt

@@ -1,14 +1,17 @@
 package hep.dataforge.vis.common
 
-import hep.dataforge.meta.*
+import hep.dataforge.meta.Configurable
+import hep.dataforge.meta.MetaItem
+import hep.dataforge.meta.MetaRepr
 import hep.dataforge.names.Name
+import hep.dataforge.names.asName
 import hep.dataforge.names.toName
 import hep.dataforge.provider.Type
 import hep.dataforge.vis.common.VisualObject.Companion.TYPE
 import kotlinx.serialization.Transient
 
-private fun Laminate.withTop(meta: Meta): Laminate = Laminate(listOf(meta) + layers)
+//private fun Laminate.withTop(meta: Meta): Laminate = Laminate(listOf(meta) + layers)
-private fun Laminate.withBottom(meta: Meta): Laminate = Laminate(layers + meta)
+//private fun Laminate.withBottom(meta: Meta): Laminate = Laminate(layers + meta)
 
 /**
  * A root type for display hierarchy
@@ -22,11 +25,6 @@ interface VisualObject : MetaRepr, Configurable {
     @Transient
     var parent: VisualObject?
 
-    /**
-     * A style which is set externally and could not be modified from inside
-     */
-    var style: Meta?
-
     /**
      * Set property for this object
      */
@@ -52,8 +50,11 @@ interface VisualObject : MetaRepr, Configurable {
      */
     fun removeChangeListener(owner: Any?)
 
+    var style: List<String>
+
     companion object {
         const val TYPE = "visual"
+        val STYLE_KEY = "style".asName()
 
         //const val META_KEY = "@meta"
         //const val TAGS_KEY = "@tags"
@@ -62,4 +63,3 @@ interface VisualObject : MetaRepr, Configurable {
 
 fun VisualObject.getProperty(key: String, inherit: Boolean = true): MetaItem<*>? = getProperty(key.toName(), inherit)
 fun VisualObject.setProperty(key: String, value: Any?) = setProperty(key.toName(), value)
-

dataforge-vis-common/src/commonMain/kotlin/hep/dataforge/vis/common/VisualObjectDelegate.kt

@@ -1,7 +1,6 @@
 package hep.dataforge.vis.common
 
 import hep.dataforge.meta.*
-import hep.dataforge.names.EmptyName
 import hep.dataforge.names.Name
 import hep.dataforge.names.NameToken
 import hep.dataforge.names.asName
@@ -11,12 +10,11 @@ import kotlin.properties.ReadOnlyProperty
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
 
-fun String.asName() = if (isBlank()) EmptyName else NameToken(this).asName()
 
 /**
  * A delegate for display object properties
  */
-class DisplayObjectDelegate(
+class VisualObjectDelegate(
     val key: Name?,
     val default: MetaItem<*>?,
     val inherited: Boolean
@@ -36,7 +34,7 @@ class DisplayObjectDelegate(
     }
 }
 
-class DisplayObjectDelegateWrapper<T>(
+class VisualObjectDelegateWrapper<T>(
     val key: Name?,
     val default: T,
     val inherited: Boolean,
@@ -63,55 +61,55 @@ class DisplayObjectDelegateWrapper<T>(
 
 
 fun VisualObject.value(default: Value? = null, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.value }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.value }
 
 fun VisualObject.string(default: String? = null, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.string }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.string }
 
 fun VisualObject.boolean(default: Boolean? = null, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.boolean }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.boolean }
 
 fun VisualObject.number(default: Number? = null, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.number }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.number }
 
 fun VisualObject.double(default: Double? = null, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.double }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.double }
 
 fun VisualObject.int(default: Int? = null, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.int }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.int }
 
 
 fun VisualObject.node(key: String? = null, inherited: Boolean = true) =
-    DisplayObjectDelegateWrapper(key?.asName(), null, inherited) { it.node }
+    VisualObjectDelegateWrapper(key?.asName(), null, inherited) { it.node }
 
 fun VisualObject.item(key: String? = null, inherited: Boolean = true) =
-    DisplayObjectDelegateWrapper(key?.asName(), null, inherited) { it }
+    VisualObjectDelegateWrapper(key?.asName(), null, inherited) { it }
 
 //fun <T : Configurable> Configurable.spec(spec: Specification<T>, key: String? = null) = ChildConfigDelegate<T>(key) { spec.wrap(this) }
 
 @JvmName("safeString")
 fun VisualObject.string(default: String, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.string }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.string }
 
 @JvmName("safeBoolean")
 fun VisualObject.boolean(default: Boolean, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.boolean }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.boolean }
 
 @JvmName("safeNumber")
 fun VisualObject.number(default: Number, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.number }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.number }
 
 @JvmName("safeDouble")
 fun VisualObject.double(default: Double, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.double }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.double }
 
 @JvmName("safeInt")
 fun VisualObject.int(default: Int, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(key?.asName(), default, inherited) { it.int }
+    VisualObjectDelegateWrapper(key?.asName(), default, inherited) { it.int }
 
 
 inline fun <reified E : Enum<E>> VisualObject.enum(default: E, key: String? = null, inherited: Boolean = false) =
-    DisplayObjectDelegateWrapper(
+    VisualObjectDelegateWrapper(
         key?.let { NameToken(it).asName() },
         default,
         inherited

dataforge-vis-spatial-gdml/src/commonMain/kotlin/hep/dataforge/vis/spatial/gdml/visualGDML.kt

@@ -1,8 +1,8 @@
 package hep.dataforge.vis.spatial.gdml
 
 import hep.dataforge.names.EmptyName
+import hep.dataforge.names.asName
 import hep.dataforge.names.plus
-import hep.dataforge.vis.common.asName
 import hep.dataforge.vis.common.get
 import hep.dataforge.vis.spatial.*
 import scientifik.gdml.*

dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/Proxy.kt

@@ -5,6 +5,7 @@ package hep.dataforge.vis.spatial
 import hep.dataforge.io.ConfigSerializer
 import hep.dataforge.io.NameSerializer
 import hep.dataforge.meta.Config
+import hep.dataforge.meta.Meta
 import hep.dataforge.meta.MetaBuilder
 import hep.dataforge.meta.MetaItem
 import hep.dataforge.names.Name
@@ -37,6 +38,11 @@ class Proxy(val templateName: Name) : AbstractVisualObject(), VisualGroup, Visua
         get() = (parent as? VisualGroup3D)?.getTemplate(templateName)
             ?: error("Template with name $templateName not found in $parent")
 
+    override fun getStyle(name: Name): Meta?  = null
+
+    override fun setStyle(name: Name, meta: Meta) {
+        //do nothing
+    }
 
     override fun getProperty(name: Name, inherit: Boolean): MetaItem<*>? {
         return if (inherit) {

dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualGroup3D.kt

@@ -1,21 +1,29 @@
-@file:UseSerializers(Point3DSerializer::class, ConfigSerializer::class, NameTokenSerializer::class)
+@file:UseSerializers(
+    Point3DSerializer::class,
+    ConfigSerializer::class,
+    NameTokenSerializer::class,
+    NameSerializer::class
+)
 
 package hep.dataforge.vis.spatial
 
 import hep.dataforge.io.ConfigSerializer
+import hep.dataforge.io.NameSerializer
 import hep.dataforge.meta.Config
+import hep.dataforge.meta.Meta
 import hep.dataforge.meta.MetaBuilder
 import hep.dataforge.meta.set
-import hep.dataforge.names.Name
+import hep.dataforge.names.*
-import hep.dataforge.names.NameToken
-import hep.dataforge.names.asName
-import hep.dataforge.names.isEmpty
 import hep.dataforge.vis.common.AbstractVisualGroup
+import hep.dataforge.vis.common.AbstractVisualObject
 import hep.dataforge.vis.common.VisualGroup
 import hep.dataforge.vis.common.VisualObject
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.UseSerializers
+import kotlin.collections.component1
+import kotlin.collections.component2
+import kotlin.collections.set
 
 @Serializable
 class VisualGroup3D : AbstractVisualGroup(), VisualObject3D {
@@ -28,8 +36,34 @@ class VisualGroup3D : AbstractVisualGroup(), VisualObject3D {
             field = value
         }
 
+    //FIXME to be lifted to AbstractVisualGroup after https://github.com/Kotlin/kotlinx.serialization/issues/378 is fixed
     public override var properties: Config? = null
 
+    private val styles = HashMap<Name, Meta>()
+
+    override fun getStyle(name: Name): Meta? = styles[name]
+
+    override fun setStyle(name: Name, meta: Meta) {
+        fun VisualObject.applyStyle(name: Name, meta: Meta) {
+            if (style.contains(name.toString())) {
+                //full update
+                //TODO do a fine grained update
+                if(this is AbstractVisualObject){
+                    styleChanged()
+                } else {
+                    propertyChanged(EmptyName)
+                }
+            }
+            if (this is VisualGroup) {
+                this.children.forEach { (_, child) ->
+                    child.applyStyle(name, meta)
+                }
+            }
+        }
+        styles[name] = meta
+        applyStyle(name, meta)
+    }
+
     override var position: Point3D? = null
     override var rotation: Point3D? = null
     override var scale: Point3D? = null

dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualObject3D.kt

@@ -4,11 +4,11 @@ package hep.dataforge.vis.spatial
 
 import hep.dataforge.io.NameSerializer
 import hep.dataforge.meta.*
+import hep.dataforge.names.asName
 import hep.dataforge.names.plus
 import hep.dataforge.output.Output
 import hep.dataforge.vis.common.Colors.rgbToString
 import hep.dataforge.vis.common.VisualObject
-import hep.dataforge.vis.common.asName
 import hep.dataforge.vis.spatial.VisualObject3D.Companion.DETAIL_KEY
 import hep.dataforge.vis.spatial.VisualObject3D.Companion.LAYER_KEY
 import hep.dataforge.vis.spatial.VisualObject3D.Companion.MATERIAL_KEY

dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeFactory.kt

@@ -2,10 +2,10 @@ package hep.dataforge.vis.spatial.three
 
 import hep.dataforge.meta.boolean
 import hep.dataforge.meta.node
+import hep.dataforge.names.asName
 import hep.dataforge.names.plus
 import hep.dataforge.names.startsWith
 import hep.dataforge.provider.Type
-import hep.dataforge.vis.common.asName
 import hep.dataforge.vis.spatial.*
 import hep.dataforge.vis.spatial.three.ThreeFactory.Companion.TYPE
 import info.laht.threekt.core.BufferGeometry