nodes: Fix updates when number of controls changes.

nodes.go

@@ -18,7 +18,7 @@ func (n Node) mount(parent Control) {
  }
 }
 
-func (n Node) updateChild(idx int, new Control) {
+func (n *Node) updateChild(idx int, new Control) {
  old := n.Children[idx].Content
  if old == nil && new == nil {
  return
@@ -48,7 +48,7 @@ func (n Node) updateChild(idx int, new Control) {
  }
 }
 
-func (n Node) Update(other Node, parent Control) {
+func (n *Node) Update(other Node, parent Control) {
  if n.Content != nil && other.Content == nil {
  if unmountable, ok := n.Content.(Unmountable); ok {
  unmountable.Unmount()

rendercontext.go

@@ -56,15 +56,15 @@ func (ctx *RenderContext) Make(render func(*RenderContext) Component) Node {
  return root
 }
 
-func printNodes(node Node, indent int) {
+func printNodes(node *Node, indent int) {
  if len(node.Children) == 0 {
  fmt.Printf("%s<%T/>\n", strings.Repeat(" ", indent), node.Content)
  return
  }
 
  fmt.Printf("%s<%T>\n", strings.Repeat(" ", indent), node.Content)
  for _, child := range node.Children {
- printNodes(child, indent+1)
+ printNodes(&child, indent+1)
  }
  fmt.Printf("%s</%T>\n", strings.Repeat(" ", indent), node.Content)
 }
@@ -96,16 +96,15 @@ func (ctx *RenderContext) TriggerUpdate() {
 
  // fmt.Printf("[%v] RENDER TRIGGERED!\n", ctx)
  ctx.count = 0
- oldTree := ctx.root
  // fmt.Println("**** RENDER STARTING ****")
  newTree := ctx.BuildNode(ctx.content)
  // fmt.Println("**** RENDER DONE ****")
 
- // fmt.Printf("[%v] Old tree: %+v\n", ctx, oldTree)
- // printNodes(oldTree, 0)
+ // fmt.Printf("[%v] Old tree: %+v\n", ctx, ctx.root)
+ // printNodes(&ctx.root, 0)
  // fmt.Printf("[%v] New tree: %+v\n", ctx, newTree)
- // printNodes(newTree, 0)
+ // printNodes(&newTree, 0)
 
- oldTree.Update(newTree, nil)
+ ctx.root.Update(newTree, nil)
  })
 }