photon-todomvc-composed.md

TodoMVC Composed (it's just a for loop!!!) — Electric Clojure

• An early demonstration "Compiler Managed Network" and the extreme dynamic composition it makes possible
• TodoMVC Composed merely calls the previous TodoMVC function inside a for loop.

20220822.Todomvc.Composed.mp4

user.cljc

(ns user.demo-todomvc-composed
  #?(:cljs (:require-macros user.demo-todomvc-composed))
  (:require
   #?(:clj [datascript.core :as d])
   [hyperfiddle.electric :as e]
   [hyperfiddle.electric-dom2 :as dom]
   [hyperfiddle.electric-ui4 :as ui]
   [user.demo-5-todomvc :as todomvc]))

(def !n #?(:clj (atom 1)))

(e/defn App []
  (e/client
    (let [state (e/watch todomvc/!state)
          n (e/server (e/watch !n))]
      (e/server
        (binding [todomvc/db (e/watch todomvc/!conn)
                  todomvc/transact! (partial d/transact! todomvc/!conn)]
          (e/client
            (dom/link (dom/props {:rel :stylesheet, :href "/todomvc.css"}))
            (ui/range n (e/fn [v] (e/server (reset! !n v)))
              (dom/props {:min 1 :max 25 :step 1}))
            (dom/div (dom/props {:class "todomvc" :style {:position "relative"}})
              (dom/h1 (dom/text "TodoMVC"))
              (e/for [i (range n)] ; <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
                (let [!focused (atom false)
                      focused (e/watch !focused)]
                  (dom/div (dom/props {:style {:position "absolute"
                                               :width "50vw"
                                               :left (str (* i 40) "px")
                                               :top (str (-> i (* 40) (+ 60)) "px")
                                               :z-index (+ i (if focused 1000 0))}})
                    (dom/on "mouseenter" (e/fn [_] (reset! !focused true)))
                    (dom/on "mouseleave" (e/fn [_] (reset! !focused false)))
                    (todomvc/TodoApp. state))))))))))) ; <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Fun.