feat: reactivity 1.

dom/src/main/scala/top/davidon/sfs/dom/Element.scala

@@ -6,6 +6,6 @@ import top.davidon.sfs.dom.tags.Tag
 /** tag + modifiers + value */
 class Element[+Ref <: org.scalajs.dom.Element](
     val tag: Tag[Ref],
-    val mods: Iterable[Modifier[?, ?]],
-    val children: Seq[Element[?] | Value[?, String]]
+    val mods: Iterable[Modifier[?]],
+    val children: Seq[Element[?] | Value[String]]
 ) {}

dom/src/main/scala/top/davidon/sfs/dom/ReactiveRenderer.scala

@@ -5,5 +5,5 @@ import top.davidon.sfs.dom.mods.Modifier
 
 trait ReactiveRenderer {
   def valueFunc[F](element: dom.Element, value: F): Unit
-  def modifierFunc[F, T](modifier: Modifier[F, T], value: F): Unit
+  def modifierFunc[F, T](modifier: Modifier[T], value: F): Unit
 }

dom/src/main/scala/top/davidon/sfs/dom/ScalaFullStackDOM.scala

@@ -6,6 +6,7 @@ import top.davidon.sfs.dom.defs.complex.{ComplexHtmlKeys, ComplexSvgKeys}
 import top.davidon.sfs.dom.defs.eventProps.GlobalEventProps
 import top.davidon.sfs.dom.defs.props.HtmlProps
 import top.davidon.sfs.dom.defs.tags.{HtmlTags, SvgTags}
+import top.davidon.sfs.dom.plain.PlainValue
 
 trait ScalaFullStackDOM
     extends HtmlTags
@@ -20,23 +21,24 @@ trait ScalaFullStackDOM
 
   object svg extends SvgTags with SvgAttrs with ComplexSvgKeys
 
-  given strToVal: Conversion[String, Value[String, String]] with {
-    def apply(from: String): Value[String, String] =
-      Value(from, StringAsIsCodec)
+  given strToVal: Conversion[String, Value[String]] with {
+    def apply(from: String): PlainValue[String, String] =
+      PlainValue(from, StringAsIsCodec)
   }
-  given intToVal: Conversion[Int, Value[Int, String]] with {
-    def apply(from: Int): Value[Int, String] = Value(from, IntAsStringCodec)
+  given intToVal: Conversion[Int, Value[String]] with {
+    def apply(from: Int): PlainValue[Int, String] =
+      PlainValue(from, IntAsStringCodec)
   }
-  given doubleToVal: Conversion[Double, Value[Double, String]] with {
-    def apply(from: Double): Value[Double, String] =
-      Value(from, DoubleAsStringCodec)
+  given doubleToVal: Conversion[Double, Value[String]] with {
+    def apply(from: Double): PlainValue[Double, String] =
+      PlainValue(from, DoubleAsStringCodec)
   }
-  given longToVal: Conversion[Long, Value[Long, String]] with {
-    def apply(from: Long): Value[Long, String] = Value(from, LongAsStringCodec)
+  given longToVal: Conversion[Long, Value[String]] with {
+    def apply(from: Long): PlainValue[Long, String] =
+      PlainValue(from, LongAsStringCodec)
   }
-  given iterToVal: Conversion[Iterable[String], Value[Iterable[String], String]]
-  with {
-    def apply(from: Iterable[String]): Value[Iterable[String], String] =
-      Value(from, IterableAsSpaceSeparatedStringCodec)
+  given iterToVal: Conversion[Iterable[String], Value[String]] with {
+    def apply(from: Iterable[String]): PlainValue[Iterable[String], String] =
+      PlainValue(from, IterableAsSpaceSeparatedStringCodec)
   }
 }

dom/src/main/scala/top/davidon/sfs/dom/TriggerableValue.scala

@@ -1,5 +0,0 @@
-package top.davidon.sfs.dom
-
-trait TriggerableValue[T] {
-  def trigger[T](value: T): Unit
-}

dom/src/main/scala/top/davidon/sfs/dom/Value.scala

@@ -1,36 +1,41 @@
 package top.davidon.sfs.dom
 
-import top.davidon.sfs.dom.codecs.{Codec, StringAsIsCodec}
+import top.davidon.sfs.dom.codecs.Codec
+import top.davidon.sfs.dom.reactive.Observable
 
-class Value[F, T](
-    val value: F,
-    val codec: Codec[F, T]
-) {
-  def apply(): T = {
-    codec.encode(value)
+trait Value[T] {
+  def apply(): T
 }
 
-  override def toString: String = {
-    value match
-      case v: Int     => codecs.IntAsStringCodec.encode(v)
-      case v: Long    => codecs.LongAsStringCodec.encode(v)
-      case v: Double  => codecs.DoubleAsStringCodec.encode(v)
-      case v: Boolean => codecs.BooleanAsTrueFalseStringCodec.encode(v)
-      case v: Iterable[String] =>
-        codecs.IterableAsSpaceSeparatedStringCodec.encode(v)
-      case _ =>
-        throw Exception("Couldn't find codec to convert a value to a string")
-  }
-}
-
-object Value {
-  def join(
-      iterator: Iterable[Value[?, String]]
-  ): Value[String, String] = {
-    Value(
-      iterator.map(v => v.toString).mkString(""),
-      StringAsIsCodec
-    )
-  }
-
-}
+//class Value[F, T](
+//    val value: F,
+//    val codec: Codec[F, T]
+//) {
+//  def apply(): T = {
+//    codec.encode(value)
+//  }
+//
+//  override def toString: String = {
+//    value match
+//      case v: Int     => codecs.IntAsStringCodec.encode(v)
+//      case v: Long    => codecs.LongAsStringCodec.encode(v)
+//      case v: Double  => codecs.DoubleAsStringCodec.encode(v)
+//      case v: Boolean => codecs.BooleanAsTrueFalseStringCodec.encode(v)
+//      case v: Iterable[String] =>
+//        codecs.IterableAsSpaceSeparatedStringCodec.encode(v)
+//      case _ =>
+//        throw Exception("Couldn't find codec to convert a value to a string")
+//  }
+//}
+//
+//object Value {
+//  def join(
+//      iterator: Iterable[Value[?, String]]
+//  ): Value[String, String] = {
+//    Value(
+//      iterator.map(v => v.toString).mkString(""),
+//      StringAsIsCodec
+//    )
+//  }
+//
+//}

dom/src/main/scala/top/davidon/sfs/dom/keys/AriaAttr.scala

@@ -2,6 +2,7 @@ package top.davidon.sfs.dom.keys
 import top.davidon.sfs.dom.codecs.{Codec, StringCodec}
 import top.davidon.sfs.dom.Value
 import top.davidon.sfs.dom.mods.Modifier
+import top.davidon.sfs.dom.plain.PlainValue
 
 class AriaAttr[V](
     suffix: String,
@@ -9,11 +10,11 @@ class AriaAttr[V](
 ) extends Key {
   override val name: String = "aria-" + suffix
 
-  @inline def apply(value: V): Modifier[V, String] = {
+  @inline def apply(value: V): Modifier[String] = {
     this := value
   }
 
-  def :=(value: V): Modifier[V, String] = {
-    Modifier(this, Value(value, codec))
+  def :=(value: V): Modifier[String] = {
+    Modifier(this, PlainValue(value, codec))
   }
 }

dom/src/main/scala/top/davidon/sfs/dom/keys/EventProp.scala

@@ -1,9 +1,11 @@
 package top.davidon.sfs.dom.keys
 
 import org.scalajs.dom
+import top.davidon.sfs.dom.Value
 import top.davidon.sfs.dom.codecs.{EmptyCodec, StringAsIsCodec}
 import top.davidon.sfs.dom.mods.{EventMod, Modifier}
-import top.davidon.sfs.dom.{TriggerableValue, Value}
+import top.davidon.sfs.dom.plain.PlainValue
+import top.davidon.sfs.dom.reactive.TriggerableValue
 
 class EventProp[E <: dom.Event](override val name: String) extends Key {
 
@@ -11,23 +13,23 @@ class EventProp[E <: dom.Event](override val name: String) extends Key {
     * @param value
     * @return
     */
-  def :=(value: E => Unit): Modifier[EventMod[E], Unit] = {
-    Modifier(this, Value(EventMod(this, value), EmptyCodec()))
+  def :=(value: E => Unit): Modifier[Unit] = {
+    Modifier(this, PlainValue(EventMod(this, value), EmptyCodec()))
   }
 
   /** Don't use with StringRenderer and ssr off/false
     * @param value
     * @return
     */
-  def :=(value: TriggerableValue[E]): Modifier[EventMod[E], Unit] = {
-    Modifier(this, Value(EventMod(this, value.trigger), EmptyCodec()))
+  def :=(value: TriggerableValue[E]): Modifier[Unit] = {
+    Modifier(this, PlainValue(EventMod(this, value.trigger), EmptyCodec()))
   }
 
   /** Only use with StringRenderer and ssr off/false
     * @param value
     * @return
     */
-  def :=(value: String): Modifier[String, String] = {
-    Modifier(this, Value(value, StringAsIsCodec))
+  def :=(value: String): Modifier[String] = {
+    Modifier(this, PlainValue(value, StringAsIsCodec))
   }
 }

dom/src/main/scala/top/davidon/sfs/dom/keys/HtmlAttr.scala

@@ -3,16 +3,17 @@ package top.davidon.sfs.dom.keys
 import top.davidon.sfs.dom.codecs.{Codec, StringCodec}
 import top.davidon.sfs.dom.Value
 import top.davidon.sfs.dom.mods.Modifier
+import top.davidon.sfs.dom.plain.PlainValue
 
 class HtmlAttr[V](
     override val name: String,
     val codec: StringCodec[V]
 ) extends Key {
-  @inline def apply(value: V): Modifier[V, String] = {
+  @inline def apply(value: V): Modifier[String] = {
     this := value
   }
 
-  def :=(value: V): Modifier[V, String] = {
-    Modifier(this, Value(value, codec))
+  def :=(value: V): Modifier[String] = {
+    Modifier(this, PlainValue(value, codec))
   }
 }

dom/src/main/scala/top/davidon/sfs/dom/keys/HtmlProp.scala

@@ -2,16 +2,17 @@ package top.davidon.sfs.dom.keys
 import top.davidon.sfs.dom.codecs.Codec
 import top.davidon.sfs.dom.Value
 import top.davidon.sfs.dom.mods.Modifier
+import top.davidon.sfs.dom.plain.PlainValue
 
 class HtmlProp[V, DomV](
     override val name: String,
     val codec: Codec[V, DomV]
 ) extends Key {
-  @inline def apply(value: V): Modifier[V, DomV] = {
+  @inline def apply(value: V): Modifier[DomV] = {
     this := value
   }
 
-  def :=(value: V): Modifier[V, DomV] = {
-    Modifier(this, Value(value, codec))
+  def :=(value: V): Modifier[DomV] = {
+    Modifier(this, PlainValue(value, codec))
   }
 }

dom/src/main/scala/top/davidon/sfs/dom/keys/SvgAttr.scala

@@ -2,6 +2,7 @@ package top.davidon.sfs.dom.keys
 import top.davidon.sfs.dom.codecs.{Codec, StringCodec}
 import top.davidon.sfs.dom.Value
 import top.davidon.sfs.dom.mods.Modifier
+import top.davidon.sfs.dom.plain.PlainValue
 
 class SvgAttr[V](
     val localName: String,
@@ -13,12 +14,12 @@ class SvgAttr[V](
 
   val namespaceUri: Option[String] = namespacePrefix.map(SvgAttr.namespaceUri)
 
-  @inline def apply(value: V): Modifier[V, String] = {
+  @inline def apply(value: V): Modifier[String] = {
     this := value
   }
 
-  def :=(value: V): Modifier[V, String] = {
-    Modifier(this, Value(value, codec))
+  def :=(value: V): Modifier[String] = {
+    Modifier(this, PlainValue(value, codec))
   }
 }
 

dom/src/main/scala/top/davidon/sfs/dom/mods/Modifier.scala

@@ -4,7 +4,7 @@ import top.davidon.sfs.dom.Value
 import top.davidon.sfs.dom.codecs.Codec
 import top.davidon.sfs.dom.keys.Key
 
-class Modifier[F, T](
+class Modifier[T](
     val key: Key,
-    val value: Value[F, T]
+    val value: Value[T]
 ) {}

dom/src/main/scala/top/davidon/sfs/dom/plain/PlainModifier.scala

@@ -0,0 +1,5 @@
+package top.davidon.sfs.dom.plain
+
+class PlainModifier {
+
+}

dom/src/main/scala/top/davidon/sfs/dom/plain/PlainValue.scala

@@ -0,0 +1,25 @@
+package top.davidon.sfs.dom.plain
+
+import top.davidon.sfs.dom.{Value, codecs}
+import top.davidon.sfs.dom.codecs.Codec
+
+class PlainValue[F, T](
+    val value: F,
+    val codec: Codec[F, T]
+) extends Value[T] {
+  def apply(): T = {
+    codec.encode(value)
+  }
+
+  override def toString: String = {
+    value match
+      case v: Int     => codecs.IntAsStringCodec.encode(v)
+      case v: Long    => codecs.LongAsStringCodec.encode(v)
+      case v: Double  => codecs.DoubleAsStringCodec.encode(v)
+      case v: Boolean => codecs.BooleanAsTrueFalseStringCodec.encode(v)
+      case v: Iterable[String] =>
+        codecs.IterableAsSpaceSeparatedStringCodec.encode(v)
+      case _ =>
+        throw Exception("Couldn't find codec to convert a value to a string")
+  }
+}

dom/src/main/scala/top/davidon/sfs/dom/reactive/Observable.scala

@@ -0,0 +1,9 @@
+package top.davidon.sfs.dom.reactive
+
+trait Observable[T] {
+  def subscribe(observer: T => Unit): Unit
+  def unsubscribe(observer: T => Unit): Unit
+  def notify(value: T): Unit
+  def update(value: T): Unit
+  def now(): T
+}

dom/src/main/scala/top/davidon/sfs/dom/reactive/ReactiveModifier.scala

@@ -0,0 +1,5 @@
+package top.davidon.sfs.dom.reactive
+
+class ReactiveModifier {
+
+}

dom/src/main/scala/top/davidon/sfs/dom/reactive/ReactiveValue.scala

@@ -0,0 +1,18 @@
+package top.davidon.sfs.dom.reactive
+
+import top.davidon.sfs.dom.Value
+import top.davidon.sfs.dom.codecs.Codec
+import top.davidon.sfs.dom.plain.PlainValue
+
+class ReactiveValue[F, T](
+    val value: Observable[F],
+    val codec: Codec[F, T]
+) extends Value[T] {
+  def apply(): T = {
+    codec.encode(value.now())
+  }
+
+  def toValueNow: PlainValue[F, T] = {
+    PlainValue(value.now(), codec)
+  }
+}

dom/src/main/scala/top/davidon/sfs/dom/reactive/TriggerableValue.scala

@@ -0,0 +1,5 @@
+package top.davidon.sfs.dom.reactive
+
+trait TriggerableValue[T] {
+  def trigger(value: T): Unit
+}

dom/src/main/scala/top/davidon/sfs/dom/tags/Tag.scala

@@ -9,9 +9,9 @@ trait Tag[+Ref <: dom.Element] {
   val void: Boolean
 
   def apply(
-      modifiers: Modifier[?, ?]*
+      modifiers: Modifier[?]*
   )(
-      values: Element[?] | Value[?, String]*
+      values: Element[?] | Value[String]*
   ): Element[Ref] = {
     Element[Ref](this, modifiers, values.toSeq)
   }

sfs/src/main/scala/top/davidon/sfs/renderers/StringRenderer.scala

@@ -15,10 +15,10 @@ class StringRenderer(val ssr: Boolean) extends Renderer[String] {
       e.mods.map(m => s" ${m.key.name}=\"${m.value.toString}\"").mkString("")
     val bodyStr = e.children
       .map {
+        case c: Value[String] =>
+          c()
         case e: Element[?] =>
           renderElement(e)
-        case c: Value[?, String] =>
-          c()
       }
       .mkString(" ")
     s"<${e.tag.name}$modsStr>$bodyStr${