Introduce Attribute builders

demo/maps/src/jvmMain/kotlin/Main.kt

@@ -29,7 +29,6 @@ import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
-import java.net.URL
 import java.nio.file.Path
 import kotlin.math.PI
 import kotlin.random.Random
@@ -69,9 +68,9 @@ fun App() {
             )
         ) {
 
-            geoJson(URL("https://raw.githubusercontent.com/ggolikov/cities-comparison/master/src/moscow.geo.json"))
+            geoJson(javaClass.getResource("/moscow.geo.json")!!)
-                .attribute(ColorAttribute, Color.Blue)
+                .modifyAttribute(ColorAttribute, Color.Blue)
-                .attribute(AlphaAttribute, 0.4f)
+                .modifyAttribute(AlphaAttribute, 0.4f)
 
             image(pointOne, Icons.Filled.Home)
 

demo/scheme/src/jvmMain/kotlin/Main.kt

@@ -79,7 +79,7 @@ fun App() {
                 )
             }
         ) {
-            val mapState: XYViewScope = rememberMapState(
+            val mapState: XYViewScope = XYViewScope.remember(
                 ViewConfig(
                     onClick = {_, click ->
                         println("${click.focus.x}, ${click.focus.y}")

maps-kt-features/src/commonMain/kotlin/center.sciprog.attributes/Attributes.kt

@@ -19,7 +19,7 @@ public value class Attributes internal constructor(internal val map: Map<Attribu
     }
 }
 
-public fun <T, A : Attribute<T>> Attributes.attribute(
+public fun <T, A : Attribute<T>> Attributes.withAttribute(
     attribute: A,
     attrValue: T?,
 ): Attributes = Attributes(
@@ -33,7 +33,7 @@ public fun <T, A : Attribute<T>> Attributes.attribute(
 /**
  * Add an element to a [SetAttribute]
  */
-public fun <T, A : SetAttribute<T>> Attributes.addValue(
+public fun <T, A : SetAttribute<T>> Attributes.withAttributeElement(
     attribute: A,
     attrValue: T,
 ): Attributes {
@@ -46,7 +46,7 @@ public fun <T, A : SetAttribute<T>> Attributes.addValue(
 /**
  * Remove an element from [SetAttribute]
  */
-public fun <T, A : SetAttribute<T>> Attributes.removeValue(
+public fun <T, A : SetAttribute<T>> Attributes.withoutAttributeElement(
     attribute: A,
     attrValue: T,
 ): Attributes {
@@ -56,8 +56,6 @@ public fun <T, A : SetAttribute<T>> Attributes.removeValue(
     )
 }
 
-
-
 public fun <T : Any, A : Attribute<T>> Attributes(
     attribute: A,
     attrValue: T,

maps-kt-features/src/commonMain/kotlin/center.sciprog.attributes/AttributesBuilder.kt

@@ -0,0 +1,45 @@
+package center.sciprog.attributes
+
+/**
+ * A safe builder for [Attributes]
+ */
+public class AttributesBuilder internal constructor(private val map: MutableMap<Attribute<*>, Any> = mutableMapOf()) {
+
+    @Suppress("UNCHECKED_CAST")
+    public operator fun <T> get(attribute: Attribute<T>): T? = map[attribute] as? T
+
+    public operator fun <V> Attribute<V>.invoke(value: V?) {
+        if (value == null) {
+            map.remove(this)
+        } else {
+            map[this] = value
+        }
+    }
+
+    public fun from(attributes: Attributes) {
+        map.putAll(attributes.map)
+    }
+
+    public fun <V> SetAttribute<V>.add(
+        attrValue: V,
+    ) {
+        val currentSet: Set<V> = get(this) ?: emptySet()
+        map[this] = currentSet + attrValue
+    }
+
+    /**
+     * Remove an element from [SetAttribute]
+     */
+    public fun <V> SetAttribute<V>.remove(
+        attrValue: V,
+    ) {
+        val currentSet: Set<V> = get(this) ?: emptySet()
+        map[this] = currentSet - attrValue
+    }
+
+    public fun build(): Attributes = Attributes(map)
+}
+
+public fun AttributesBuilder(
+    attributes: Attributes,
+): AttributesBuilder = AttributesBuilder(attributes.map.toMutableMap())

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/FeatureGroup.kt

@@ -74,25 +74,28 @@ public data class FeatureGroup<T : Any>(
     public fun <A> getAttribute(id: FeatureId<Feature<T>>, key: Attribute<A>): A? =
         get(id).attributes[key]
 
-    public fun <F : Feature<T>> FeatureId<F>.modifyAttributes(modify: Attributes.() -> Attributes): FeatureId<F> {
+
-        feature(this, get(this).withAttributes(modify))
+    override fun getBoundingBox(zoom: Float): Rectangle<T>? = with(space) {
+        featureMap.values.mapNotNull { it.getBoundingBox(zoom) }.wrapRectangles()
+    }
+
+    override fun withAttributes(modify: Attributes.() -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+
+    public fun <F : Feature<T>> FeatureId<F>.modifyAttributes(modify: AttributesBuilder.() -> Unit): FeatureId<F> {
+        feature(
+            this,
+            get(this).withAttributes {
+                AttributesBuilder(this).apply(modify).build()
+            }
+        )
         return this
     }
 
-    public fun <F : Feature<T>, V> FeatureId<F>.attribute(key: Attribute<V>, value: V?): FeatureId<F> {
+    public fun <F : Feature<T>, V> FeatureId<F>.modifyAttribute(key: Attribute<V>, value: V?): FeatureId<F> {
-        feature(this, get(this).withAttributes { attribute(key, value) })
+        feature(this, get(this).withAttributes { withAttribute(key, value) })
         return this
     }
 
-    /**
-     * Add multi-entry [SetAttribute] value
-     */
-    public fun <F : Feature<T>, V> FeatureId<F>.addAttribute(key: SetAttribute<V>, value: V): FeatureId<F> {
-        feature(this, get(this).withAttributes { addValue(key, value) })
-        return this
-    }
-
-
     /**
      * Add drag to this feature
      *
@@ -101,10 +104,10 @@ public data class FeatureGroup<T : Any>(
      * TODO use context receiver for that
      */
     @Suppress("UNCHECKED_CAST")
-    public fun FeatureId<DraggableFeature<T>>.draggable(
+    public fun <F : DraggableFeature<T>> FeatureId<F>.draggable(
         constraint: ((T) -> T)? = null,
         listener: (PointerEvent.(from: ViewPoint<T>, to: ViewPoint<T>) -> Unit)? = null,
-    ) {
+    ): FeatureId<F> {
         if (getAttribute(this, DraggableAttribute) == null) {
             val handle = DragHandle.withPrimaryButton<Any> { event, start, end ->
                 val feature = featureMap[id] as? DraggableFeature<T> ?: return@withPrimaryButton DragResult(end)
@@ -121,70 +124,51 @@ public data class FeatureGroup<T : Any>(
                     DragResult(end, true)
                 }
             }
-            this.attribute(DraggableAttribute, handle)
+            modifyAttribute(DraggableAttribute, handle)
         }
 
         //Apply callback
         if (listener != null) {
             onDrag(listener)
         }
+        return this
     }
 
 
     @Suppress("UNCHECKED_CAST")
-    public fun FeatureId<DraggableFeature<T>>.onDrag(
+    public fun <F : DraggableFeature<T>> FeatureId<F>.onDrag(
         listener: PointerEvent.(from: ViewPoint<T>, to: ViewPoint<T>) -> Unit,
-    ) {
+    ): FeatureId<F> = modifyAttributes {
-        addAttribute(
+        DragListenerAttribute.add(
-            DragListenerAttribute,
             DragListener { event, from, to -> event.listener(from as ViewPoint<T>, to as ViewPoint<T>) }
         )
     }
 
+
     @Suppress("UNCHECKED_CAST")
     public fun <F : DomainFeature<T>> FeatureId<F>.onClick(
         onClick: PointerEvent.(click: ViewPoint<T>) -> Unit,
-    ) {
+    ): FeatureId<F> = modifyAttributes {
-        addAttribute(
+        ClickListenerAttribute.add(
-            ClickListenerAttribute,
             MouseListener { event, point -> event.onClick(point as ViewPoint<T>) }
         )
-
     }
 
     @Suppress("UNCHECKED_CAST")
     public fun <F : DomainFeature<T>> FeatureId<F>.onHover(
         onClick: PointerEvent.(move: ViewPoint<T>) -> Unit,
-    ) {
+    ): FeatureId<F> = modifyAttributes {
-        addAttribute(
+        HoverListenerAttribute.add(
-            HoverListenerAttribute,
             MouseListener { event, point -> event.onClick(point as ViewPoint<T>) }
         )
     }
 
-//    /**
-//     * Cyclic update of a feature. Called infinitely until canceled.
-//     */
-//    public fun <F : Feature<T>> FeatureId<F>.updated(
-//        scope: CoroutineScope,
-//        update: suspend (F) -> F,
-//    ): Job = scope.launch {
-//        while (isActive) {
-//            feature(this@updated, update(get(this@updated)))
-//        }
-//    }
-
     public fun <F : Feature<T>> FeatureId<F>.color(color: Color): FeatureId<F> =
-        attribute(ColorAttribute, color)
+        modifyAttribute(ColorAttribute, color)
 
     public fun <F : Feature<T>> FeatureId<F>.zoomRange(range: FloatRange): FeatureId<F> =
-        attribute(ZoomRangeAttribute, range)
+        modifyAttribute(ZoomRangeAttribute, range)
 
-    override fun getBoundingBox(zoom: Float): Rectangle<T>? = with(space) {
-        featureMap.values.mapNotNull { it.getBoundingBox(zoom) }.wrapRectangles()
-    }
-
-    override fun withAttributes(modify: Attributes.() -> Attributes): Feature<T> = copy(attributes = modify(attributes))
 
     public companion object {
 

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/compositeFeatures.kt

@@ -2,7 +2,6 @@ package center.sciprog.maps.features
 
 import center.sciprog.attributes.Attributes
 import center.sciprog.attributes.ZAttribute
-import center.sciprog.attributes.attribute
 
 
 public fun <T : Any> FeatureGroup<T>.draggableLine(
@@ -20,7 +19,10 @@ public fun <T : Any> FeatureGroup<T>.draggableLine(
             get(bId).center,
             lineId?.id ?: id
         )
-        if (attributes != null) currentId.modifyAttributes { attributes.attribute(ZAttribute, -10f) }
+        currentId.modifyAttributes {
+            ZAttribute(-10f)
+            if (attributes != null) from(attributes)
+        }
         lineId = currentId
         return currentId
     }

maps-kt-geojson/src/commonMain/kotlin/center/sciprog/maps/geojson/GeoJsonProperties.kt

@@ -0,0 +1,8 @@
+package center.sciprog.maps.geojson
+
+import center.sciprog.attributes.Attribute
+import kotlinx.serialization.json.JsonObject
+
+public object GeoJsonPropertiesAttribute : Attribute<JsonObject>
+
+public object GeoJsonNameAttribute : Attribute<String>

maps-kt-geojson/src/commonMain/kotlin/center/sciprog/maps/geojson/geoJsonFeature.kt

@@ -60,7 +60,7 @@ public fun FeatureGroup<Gmc>.geoJsonFeature(
     id: String? = null,
 ): FeatureId<Feature<Gmc>> {
     val geometry = geoJson.geometry ?: return group{}
-    val idOverride = geoJson.properties?.get("id")?.jsonPrimitive?.contentOrNull ?: id
+    val idOverride = geoJson.json["id"]?.jsonPrimitive?.contentOrNull ?: geoJson.properties?.get("id")?.jsonPrimitive?.contentOrNull ?: id
     val colorOverride = geoJson.properties?.get("color")?.jsonPrimitive?.intOrNull?.let { Color(it) }
     val jsonGeometry =  geoJsonGeometry(geometry, idOverride)
     return if( colorOverride!= null){

maps-kt-scheme/src/commonMain/kotlin/center/sciprog/maps/scheme/XYViewScope.kt

@@ -43,10 +43,10 @@ class XYViewScope(
         val bottomRight = rightBottom.toDpOffset()
         return DpRect(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y)
     }
-}
 
+    companion object{
         @Composable
-public fun rememberMapState(
+        public fun remember(
             config: ViewConfig<XY>,
             initialViewPoint: ViewPoint<XY>? = null,
             initialRectangle: Rectangle<XY>? = null,
@@ -59,3 +59,6 @@ public fun rememberMapState(
                 }
             }
         }
+    }
+}
+