nextgen example works now

experiments/nextgen.nim

@@ -1,13 +1,12 @@
 
 import vdom, kdom, vstyles, karax, karaxdsl, jdict, jstrutils, reactive
 
-proc newTextInput*(text: RString; focus: RBool): VNode {.track.} =
+proc textInput*(text: RString; focus: RBool): VNode {.track.} =
   proc onFlip(ev: Event; target: VNode) =
     focus <- not focus.value
 
   proc onKeyupEnter(ev: Event; target: VNode) =
     text <- target.value
-    #text.notifyObservers()
 
   proc onkeyup(ev: Event; n: VNode) =
     # keep displayValue up to date, but do not tell the client yet!
@@ -30,29 +29,49 @@ var gu = newRSeq(@[ (User(firstname: "Some", lastname: "Body")),
                     (User(firstname: "Some", lastname: "Two"))])
 var prevSelected: User = nil #newReactive[User](nil)
 
-proc toUI*(): RString =
+proc unselect() =
+  if prevSelected != nil:
+    prevSelected.selected = false
+    notifyObservers(prevSelected)
+    prevSelected = nil
+
+proc select(u: User) =
+  unselect()
+  u.selected = true
+  notifyObservers(u)
+  prevSelected = u
+
+proc toUI*(isFirstname: bool): RString =
   result = RString()
   result.subscribe proc (v: cstring) =
     if v.len > 0:
       let p = prevSelected #selected.value
       if p != nil:
-        # XXX what's happening here?
+        if isFirstName:
-        p.firstname = v
+          p.firstname = v
+        else:
+          p.lastname = v
         notifyObservers(p)
+        unselect()
       errmsg <- ""
     else:
       errmsg <- "name must not be empty"
 
-var inp = toUI()
+var firstname = toUI(true)
+var lastname = toUI(false)
 
 proc adaptFocus(def = false): RBool =
   result = RBool()
   result.value = def
-  result.subscribe proc (hasFocus: bool) =
+  when false:
-    if not hasFocus:
+    result.subscribe proc (hasFocus: bool) =
-      inp.notifyObservers()
+      if not hasFocus:
+        unselect()
+        firstname.notifyObservers()
+        lastname.notifyObservers()
 
-var focus = adaptFocus()
+var focusA = adaptFocus()
+var focusB = adaptFocus()
 
 proc styler(): VStyle =
   result = style(
@@ -61,7 +80,7 @@ proc styler(): VStyle =
     (StyleAttr.paddingRight, cstring"5px"),
     (StyleAttr.height, cstring"30px"),
     (StyleAttr.lineHeight, cstring"30px"),
-    (StyleAttr.border, cstring"solid 8px " & (if focus.value: cstring"red" else: cstring"black")),
+    (StyleAttr.border, cstring"solid 8px " & (if focusA.value: cstring"red" else: cstring"black")),
     (StyleAttr.fontSize, cstring"12px"),
     (StyleAttr.fontWeight, cstring"600")
   )
@@ -88,22 +107,19 @@ template observe(s: cstring): RString =
 
 proc renderUser(u: User): VNode {.track.} =
   result = buildHtml(tdiv):
-    let displayName = u.firstname & " " & u.lastname
     if u.selected:
-      # == selected.value:
+      !(firstname <- u.firstname)
-      !(inp <- displayName)
+      tdiv:
-      newTextInput inp, focus
+        textInput firstname, focusA
+      !(lastname <- u.lastname)
+      tdiv:
+        textInput lastname, focusB
     else:
       button:
         text "..."
         proc onclick(ev: Event; n: VNode) =
-          if prevSelected != nil:
+          select(u)
-            prevSelected.selected = false
+      text u.firstname & " " & u.lastname
-            notifyObservers(prevSelected)
-          u.selected = true
-          notifyObservers(u)
-          prevSelected = u
-      text displayName
     button:
       text "(x)"
       proc onclick(ev: Event; n: VNode) =

src/reactive.nim

@@ -52,8 +52,11 @@ proc addSink(x: ReactiveBase; sink: proc(msg: Message; pos: int)) =
     inc rid
     x.id = rid
 
+var inhibited: int
+
 proc broadcast(x: ReactiveBase, msg: Message; pos = 0) =
-  for s in x.sinks: s(msg, pos)
+  if inhibited == 0:
+    for s in x.sinks: s(msg, pos)
 
 var toTrack: proc (msg: Message; pos: int) = nil
 
@@ -220,10 +223,12 @@ proc map*[T, U](x: RSeq[T], f: proc(x: T): U): RSeq[U] =
 import macros
 
 template protect(r: ReactiveBase; body: untyped) =
-  var tmp: seq[proc(msg: Message, pos: int)]
+  #var tmp: seq[proc(msg: Message, pos: int)]
-  swap(r.sinks, tmp)
+  #swap(r.sinks, tmp)
+  inc inhibited
   body
-  swap(r.sinks, tmp)
+  dec inhibited
+  #swap(r.sinks, tmp)
 
 template trackImpl(r: ReactiveBase; key: cstring; a, b: untyped) =
   when r is ReactiveBase: