Add proper impl of undo/redo.

src/uxbox/main/data/pages.cljs

@@ -55,8 +55,7 @@
   (let [data (:data page)
         shapes (:shapes data)
         shapes-by-id (:shapes-by-id data)
-        page (-> page
-                 (dissoc page :data)
+        page (-> (dissoc page :data)
                  (assoc :shapes shapes))]
     (-> state
         (update :shapes-by-id merge shapes-by-id)

src/uxbox/main/data/undo.cljs

@@ -5,32 +5,19 @@
 ;; Copyright (c) 2016 Andrey Antukh <niwi@niwi.nz>
 
 (ns uxbox.main.data.undo
-  (:require [cuerdas.core :as str]
-            [promesa.core :as p]
+  (:require #_[cljs.pprint :as pp]
             [beicon.core :as rx]
-            [lentes.core :as l]
             [uxbox.util.rstore :as rs]
-            [uxbox.util.router :as r]
-            [uxbox.main.repo :as rp]
-            [uxbox.util.i18n :refer (tr)]
-            [uxbox.util.schema :as sc]
             [uxbox.main.data.pages :as udp]
-            [uxbox.main.state :as st]
-            [uxbox.util.datetime :as dt]
-            [uxbox.util.data :refer (without-keys
-                                     replace-by-id
-                                     index-by)]))
+            [uxbox.main.state :as st]))
 
-(defrecord SaveUndoEntry [id]
-  rs/UpdateEvent
-  (-apply-update [_ state]
-    (let [page (udp/pack-page state id)]
-      (update-in state [:undo id :stack] (fnil conj []) page)))
+;; --- Watch Page Changes
 
-  rs/EffectEvent
-  (-apply-effect [_ state]
-    (let [undo (get-in state [:undo id])]
-      (println (pr-str undo)))))
+(declare save-undo-entry)
+(declare save-undo-entry?)
+(declare undo?)
+(declare redo?)
+(declare initialize-undo-for-page)
 
 (defn watch-page-changes
   "A function that starts watching for `IPageUpdate`
@@ -38,10 +25,123 @@
   reacts on them emiting an other event that just
   persists the state of the page in an undo stack."
   [id]
-  (letfn [(on-value []
-            (rs/emit! (->SaveUndoEntry id)))]
+  (rs/emit! (initialize-undo-for-page id))
   (as-> rs/stream $
     (rx/filter #(satisfies? udp/IPageUpdate %) $)
+    (rx/filter #(not (undo? %)) $)
+    (rx/filter #(not (redo? %)) $)
     (rx/debounce 500 $)
-      (rx/on-next $ on-value))))
+    (rx/on-next $ #(rs/emit! (save-undo-entry id)))))
 
+;; -- Save Undo Entry
+
+(defrecord SaveUndoEntry [id]
+  rs/UpdateEvent
+  (-apply-update [_ state]
+    (let [page (udp/pack-page state id)]
+      (-> state
+          (update-in [:undo id :stack] #(cons (:data page) %))
+          (assoc-in [:undo id :selected] 0)))))
+
+  ;; rs/EffectEvent
+  ;; (-apply-effect [_ state]
+  ;;   (let [undo (get-in state [:undo id])]
+  ;;     (println (pr-str undo)))))
+
+(defn save-undo-entry
+  [id]
+  (SaveUndoEntry. id))
+
+(defn save-undo-entry?
+  [v]
+  (instance? SaveUndoEntry v))
+
+;; --- Initialize Undo (For page)
+
+(defrecord InitializeUndoForPage [id]
+  rs/WatchEvent
+  (-apply-watch [_ state stream]
+    (let [initialized? (get-in state [:undo id])
+          page-loaded? (get-in state [:pages-by-id id])]
+      (cond
+        (and page-loaded? initialized?)
+        (rx/empty)
+
+        page-loaded?
+        (rx/of (save-undo-entry id))
+
+        :else
+        (->> stream
+             (rx/filter udp/pages-fetched?)
+             (rx/take 1)
+             (rx/map #(initialize-undo-for-page id)))))))
+
+(defn- initialize-undo-for-page
+  [id]
+  (InitializeUndoForPage. id))
+
+;; --- Select Previous Entry
+
+(defrecord Undo []
+  udp/IPageUpdate
+  rs/UpdateEvent
+  (-apply-update [_ state]
+    (let [page-id (get-in state [:workspace :page])
+          undo (get-in state [:undo page-id])
+          stack (:stack undo)
+          selected (:selected undo 0)]
+      (if (>= selected (dec (count stack)))
+        state
+        (let [pointer (inc selected)
+              page (get-in state [:pages-by-id page-id])
+              data (nth stack pointer)
+              packed (assoc page :data data)]
+
+          ;; (println "Undo: pointer=" pointer)
+          ;; (println "Undo: packed=")
+          ;; (pp/pprint packed)
+
+          (-> state
+              (udp/unpack-page packed)
+              (assoc-in [:undo page-id :selected] pointer)))))))
+
+(defn undo
+  []
+  (Undo.))
+
+(defn undo?
+  [v]
+  (instance? Undo v))
+
+;; --- Select Next Entry
+
+(defrecord Redo []
+  udp/IPageUpdate
+  rs/UpdateEvent
+  (-apply-update [_ state]
+    (let [page-id (get-in state [:workspace :page])
+          undo (get-in state [:undo page-id])
+          stack (:stack undo)
+          selected (:selected undo)]
+      (if (or (nil? selected) (zero? selected))
+        state
+        (let [pointer (dec selected)
+              data (nth stack pointer)
+              page (get-in state [:pages-by-id page-id])
+              packed (assoc page :data data)]
+
+          ;; (println "Redo: pointer=" pointer)
+          ;; (println "Redo: packed=")
+          ;; (pp/pprint packed)
+
+          (-> state
+              (udp/unpack-page packed)
+              (assoc-in [:undo page-id :selected] pointer)))))))
+
+(defn redo
+  []
+  (Redo.))
+
+(defn redo?
+  [v]
+  (instance? Redo v))

src/uxbox/main/ui/workspace.cljs

@@ -47,8 +47,8 @@
   (let [[projectid pageid] (:rum/args own)
         sub1 (scroll/watch-scroll-interactions own)
         sub2 (udp/watch-page-changes pageid)
-        sub3 (udh/watch-page-changes)
-        sub4 (udu/watch-page-changes pageid)
+        sub3 (udu/watch-page-changes pageid)
+        sub4 (udh/watch-page-changes)
         dom (mx/ref-node own "workspace-canvas")]
 
     ;; Set initial scroll position
@@ -78,12 +78,17 @@
       (do
         (rs/emit! (dw/initialize projectid pageid))
         (.close (::sub2 old-state))
+        (.close (::sub3 old-state))
         (assoc state
                ::sub1 (::sub1 old-state)
-               ::sub2 (udp/watch-page-changes pageid)))
+               ::sub2 (udp/watch-page-changes pageid)
+               ::sub3 (udu/watch-page-changes pageid)
+               ::sub4 (::sub4 old-state)))
       (assoc state
              ::sub1 (::sub1 old-state)
-             ::sub2 (::sub2 old-state)))))
+             ::sub2 (::sub2 old-state)
+             ::sub3 (::sub3 old-state)
+             ::sub4 (::sub4 old-state)))))
 
 (defn- on-scroll
   [event]

src/uxbox/main/ui/workspace/shortcuts.cljs

@@ -12,8 +12,9 @@
             [uxbox.main.data.lightbox :as udl]
             [uxbox.main.data.workspace :as dw]
             [uxbox.main.data.shapes :as uds]
-            [uxbox.main.ui.workspace.sidebar.drawtools :as wsd]
-            [uxbox.main.data.history :as udh])
+            [uxbox.main.data.undo :as udu]
+            [uxbox.main.data.history :as udh]
+            [uxbox.main.ui.workspace.sidebar.drawtools :as wsd])
   (:import goog.events.EventType
            goog.events.KeyCodes
            goog.ui.KeyboardShortcutHandler
@@ -36,13 +37,13 @@
    :ctrl+d #(rs/emit! (uds/duplicate-selected))
    :ctrl+c #(rs/emit! (dw/copy-to-clipboard))
    :ctrl+v #(rs/emit! (dw/paste-from-clipboard))
-   :ctrl+z #(rs/emit! (udh/backwards-to-previous-version))
+   :ctrl+shift+v #(udl/open! :clipboard)
+   :ctrl+z #(rs/emit! (udu/undo))
+   :ctrl+shift+z #(rs/emit! (udu/redo))
    :ctrl+b #(rs/emit! (dw/select-for-drawing wsd/+draw-tool-rect+))
    :ctrl+e #(rs/emit! (dw/select-for-drawing wsd/+draw-tool-circle+))
    :ctrl+l #(rs/emit! (dw/select-for-drawing wsd/+draw-tool-line+))
    :ctrl+t #(rs/emit! (dw/select-for-drawing wsd/+draw-tool-text+))
-   :ctrl+shift+z #(rs/emit! (udh/forward-to-next-version))
-   :ctrl+shift+v #(udl/open! :clipboard)
    :esc #(rs/emit! (uds/deselect-all))
    :backspace #(rs/emit! (uds/delete-selected))
    :delete #(rs/emit! (uds/delete-selected))