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core.cljs
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(ns enfocus.core
(:require [enfocus.enlive.syntax :as en]
[goog.net.XhrIo :as xhr]
[goog.dom.query :as query]
[goog.style :as style]
[goog.events :as events]
[goog.dom :as dom]
[goog.dom.classes :as classes]
[goog.dom.ViewportSizeMonitor :as vsmonitor]
[goog.events :as events]
[goog.fx :as fx]
[goog.fx.dom :as fx-dom]
[goog.async.Delay :as gdelay]
[goog.Timer :as timer]
[clojure.string :as string]
[domina :as domina]
[domina.css :as dcss])
(:require-macros [enfocus.macros :as em]))
(declare css-syms css-select create-sel-str at from)
;####################################################
; Utility functions
;####################################################
(def debug false)
(defn log-debug [mesg]
(when (and debug (not (= (.-console js/window) js/undefined)))
(.log js/console mesg)))
(defn setTimeout [func ttime]
(timer/callOnce func ttime))
(defn node? [tst]
(dom/isNodeLike tst))
(defn nodelist? [tst]
(instance? js/NodeList tst))
(defn nodes->coll
"coverts a nodelist, node into a collection"
[nl]
(if (= nl js/window)
[nl]
(domina/nodes nl)))
(defn- flatten-nodes-coll [values]
"takes a set of nodes and nodelists and flattens them"
(mapcat #(cond (string? %) [(dom/createTextNode %)]
:else (nodes->coll %)) values))
(defn- style-set
"Sets property name to a value on a element and Returns the original object"
[obj values]
(do (doseq [[attr value] (apply hash-map values)]
(style/setStyle obj (name attr) value))
obj))
(defn- style-remove
"removes the property value from an elements style obj."
[obj values]
(doseq [attr values]
(if (.-IE goog/userAgent)
(style/setStyle obj (name attr) "")
(. (.-style obj) (removeProperty (name attr))))))
(defn get-eff-prop-name [etype]
(str "__ef_effect_" etype))
(defn get-mills [] (. (js/Date.) (getMilliseconds)))
(defn child-of?
"returns true if the node(child) is a child of parent"
[parent child]
(cond
(not child) false
(identical? parent child) false
(identical? (.-parentNode child) parent) true
:else (recur parent (.-parentNode child))))
(defn mouse-enter-leave
"this is used to build cross browser versions of :mouseenter and :mouseleave events"
[func]
(fn [e]
(let [re (.-relatedTarget e)
this (.-currentTarget e)]
(when (and
(not (identical? re this))
(not (child-of? this re)))
(func e)))))
(defn pix-round [step]
(if (neg? step) (Math/floor step) (Math/ceil step)))
(defn add-map-attrs
([elem ats]
(when elem
(when (map? ats)
(do
(doseq [[k v] ats]
(add-map-attrs elem k v))
elem))))
([elem k v]
(. elem (setAttribute (name k) v))
elem))
;####################################################
; The following functions are used to manage the
; emote dom features for templates and snippets
;####################################################
(def tpl-load-cnt
"this is incremented everytime a remote template is loaded and decremented when
it is added to the dom cache"
(atom 0))
(def tpl-cache
"cache for the remote templates"
(atom {}))
(def hide-style (.-strobj {"style" "display: none; width: 0px; height: 0px"}))
(defn create-hidden-dom
"Add a hidden div to hold the dom as we are transforming it this has to be done
because css selectors do not work unless we have it in the main dom"
[child]
(let [div (dom/createDom "div" hide-style)]
(if (instance? js/DocumentFragment child)
(dom/appendChild div child)
(do
(log-debug (count (domina/nodes child)))
(doseq [node (domina/nodes child)]
(dom/appendChild div node))))
(dom/appendChild (.-body (dom/getDocument)) div)
div))
(defn remove-node-return-child
"removes the hidden div and returns the children"
[div]
(let [child (.-childNodes div)
frag (. js/document (createDocumentFragment))]
(dom/append frag child)
(dom/removeNode div)
frag))
(defn replace-ids
"replaces all the ids in a string html fragement/template with a generated
symbol appended on to a existing id this is done to make sure we don't have
id colisions during the transformation process"
[text]
(let [re (js/RegExp. "(<.*?\\sid=['\"])(.*?)(['\"].*?>)" "g")
sym (str (name (gensym "id")) "_")]
[(str sym) (.replace text re (fn [a b c d] (str b sym c d)))]))
(defn reset-ids
"before adding the dom back into the live dom we reset the masked ids to orig vals"
[sym nod]
(let [id-nodes (css-select nod "*[id]")
nod-col (nodes->coll id-nodes)]
(doall (map #(let [id (. % (getAttribute "id"))
rid (. id (replace sym ""))]
(. % (setAttribute "id" rid))) nod-col))))
(defn load-remote-dom
"loads a remote file into the cache, and masks the ids to avoid collisions"
[uri dom-key]
(when (nil? (@tpl-cache uri))
(swap! tpl-load-cnt inc)
(let [req (new goog.net.XhrIo)
callback (fn [req]
(let [text (. req (getResponseText))
[sym txt] (replace-ids text)
data (dom/htmlToDocumentFragment txt)]
(swap! tpl-cache assoc dom-key [sym data] )))]
(events/listen req goog.net.EventType/COMPLETE
#(do
(callback req)
(swap! tpl-load-cnt dec)))
(. req (send uri "GET")))))
(defn get-cached-dom
"returns and dom from the cache and symbol used to scope the ids"
[uri]
(let [nod (@tpl-cache uri)]
(when nod [(first nod) (. (second nod) (cloneNode true))])))
(defn get-cached-snippet
"returns the cached snippet or creates one and adds it to the cache if needed"
[uri sel]
(let [sel-str (create-sel-str sel)
cache (@tpl-cache (str uri sel-str))]
(if cache [(first cache) (. (second cache) (cloneNode true))]
(let [[sym tdom] (get-cached-dom uri)
dom (create-hidden-dom tdom)
tsnip (domina/nodes (css-select sym dom sel))
snip (first tsnip)]
(remove-node-return-child dom)
(swap! tpl-cache assoc (str uri sel-str) [sym snip])
[sym snip]))))
;####################################################
; The following functions are used to transform the
; dom structure. each function returns a function
; taking the a set of nodes from a selector
;####################################################
(defn extr-multi-node
"wrapper function for extractors that maps the extraction to all nodes returned by the selector"
[func]
(fn trans
[pnodes]
(let [pnod-col (nodes->coll pnodes)
result (map func pnod-col)]
(if (<= (count result) 1) (first result) result))))
(defn chainable-standard
"wrapper function for transforms, maps the transform to all nodes returned
by the selector and provides the ability to chain transforms with the chain command."
[func]
(fn trans
([pnodes] (trans pnodes nil))
([pnodes chain]
(let [pnod-col (nodes->coll pnodes)]
(doall (map func pnod-col))
(when (not (nil? chain))
(chain pnodes))))))
(defn chainable-effect
"wrapper function for effects, maps the effect to all nodes returned by the
selector and provides chaining and callback functionality"
[func callback]
(fn trans
([pnodes] (trans pnodes nil))
([pnodes chain]
(let [pnod-col (nodes->coll pnodes)
cnt (atom (count pnod-col))
partial-cback (fn []
(swap! cnt dec)
(when (= 0 @cnt)
(when (not (nil? callback)) (callback pnodes))
(when (not (nil? chain)) (chain pnodes))))]
(doseq [pnod pnod-col] (func pnod partial-cback))))))
(defn domina-chain
"Allows standard domina functions to be chainable"
([func]
(fn trans
([nodes] (trans nodes nil))
([nodes chain]
(func nodes)
(when (not (nil? chain)) (chain nodes)))))
([values func]
(fn trans
([nodes] (trans nodes nil))
([nodes chain]
(let [vnodes (mapcat #(domina/nodes %) values)]
(func nodes vnodes))
(when (not (nil? chain)) (chain nodes))))))
;;TODO need to figure out how to make sure this stay just as
;;text and not convert to html.
(defn en-content
"Replaces the content of the element. Values can be nodes or collection of nodes."
[& values]
(domina-chain values #(do
(domina/destroy-children! %1)
(domina/append! %1 %2))))
(defn en-html-content
"Replaces the content of the element with the dom structure represented by the html string passed"
[txt]
(domina-chain #(domina/set-html! % txt)))
(defn en-set-attr
"Assocs attributes and values on the selected element."
[& values]
(let [pairs (partition 2 values)]
(domina-chain
#(doseq [[name value] pairs] (domina/set-attr! % name value)))))
(defn en-remove-attr
"Dissocs attributes on the selected element."
[& values]
(domina-chain #(doseq [name values] (domina/remove-attr! % name))))
(defn en-set-prop [& forms]
(em/trans [node]
(let [h (mapcat (fn [[n v]](list (name n) v)) (partition 2 forms))]
(dom/setProperties node (apply js-obj h)))))
(defn- has-class
"returns true if the element has a given class"
[el cls]
(classes/hasClass el cls))
(defn en-add-class
"Adds the specified classes to the selected element."
[ & values]
(domina-chain
#(doseq [val values] (domina/add-class! % val))))
(defn en-remove-class
"Removes the specified classes from the selected element."
[ & values]
(domina-chain
#(doseq [val values] (domina/remove-class! % val))))
(defn en-set-class
"Sets the specified classes on the selected element"
[ & values]
(domina-chain
#(domina/set-classes! % values)))
(defn en-do-> [ & forms]
"Chains (composes) several transformations. Applies functions from left to right."
(em/trans [pnod]
(doseq [fun forms] (fun pnod))))
(defn en-append
"Appends the content of the element. Values can be nodes or collection of nodes."
[& values]
(domina-chain values #(domina/append! %1 %2)))
(defn en-prepend
"Prepends the content of the element. Values can be nodes or collection of nodes."
[& values]
(domina-chain values #(domina/prepend! %1 %2)))
(defn en-before
"inserts the content before the selected node. Values can be nodes or collection of nodes"
[& values]
(domina-chain values #(domina/insert-before! %1 %2)))
(defn en-after
"inserts the content after the selected node. Values can be nodes or collection of nodes"
[& values]
(domina-chain values #(domina/insert-after! %1 %2)))
(defn en-substitute
"substitutes the content for the selected node. Values can be nodes or collection of nodes"
[& values]
(domina-chain values #(domina/swap-content! %1 %2)))
(defn en-remove-node
"removes the selected nodes from the dom"
[]
(domina-chain #(domina/detach! %1)))
(defn en-wrap
"wrap and element in a new element defined as :div {:class 'temp'}"
[elm mattr]
(em/trans [pnod]
(let [elem (dom/createElement (name elm))]
(add-map-attrs elem mattr)
(at elem (em/content (.cloneNode pnod true)))
(at pnod (em/do-> (em/after elem)
(em/remove-node))))))
(defn en-unwrap
"replaces a node with all its children"
[]
(em/trans [pnod]
(let [frag (. js/document (createDocumentFragment))]
(dom/append frag (.-childNodes pnod))
(dom/replaceNode frag pnod))))
(defn en-set-style
"set a list of style elements from the selected nodes"
[& values]
(let [pairs (partition 2 values)]
(domina-chain
#(doseq [[name value] pairs] (domina/set-style! % name value)))))
(defn en-remove-style
"remove a list style elements from the selected nodes. note: you can only remove styles that are inline"
[& values]
(em/trans [pnod]
(style-remove pnod values)))
(defn en-focus
"calls the focus function on the selected node"
[]
(em/trans [node]
(.focus node)))
(defn en-blur
"calls the blur function on the selected node"
[]
(em/trans [node]
(.blur node)))
(defn en-set-data
"addes key value pair of data to the selected nodes. Only use clojure data structures when setting"
[ky val]
(domina-chain #(domina/set-data! % ky val)))
(def view-port-monitor (atom nil))
(defn get-vp-monitor
"needed to support window :resize"
[]
(if @view-port-monitor @view-port-monitor
(do
(swap! view-port-monitor #(new goog.dom.ViewportSizeMonitor))
@view-port-monitor)))
(defn gen-enter-leave-wrapper [event]
(let [obj (new js/Object)]
(set! (.-listen obj)
(fn [elm func opt-cap opt-scope opt-handler]
(let [callback (mouse-enter-leave func)]
(set! (.-listen callback) func)
(set! (.-scope callback) opt-scope)
(if opt-handler
(.listen opt-handler elm (name event) callback)
(events/listen elm (name event) callback)))))
(set! (.-unlisten obj)
(fn [elm func opt-cap opt-scope opt-handler]
(let [listeners (events/getListeners elm (name event) false)]
(doseq [obj listeners]
(let[listener (.-listener obj)]
(when (and (or (not func) (= (.-listen listener) func))
(or (not opt-scope) (= (.-scope listener) opt-scope)))
(if opt-handler
(.unlisten opt-handler elm (name event) listener)
(events/unlisten elm (name event) listener))))) listeners)))
obj))
(def wrapper-register {:mouseenter (gen-enter-leave-wrapper :mouseover)
:mouseleave (gen-enter-leave-wrapper :mouseout)})
(defn en-listen
"adding an event to the selected nodes"
[event func]
(let [wrapper (wrapper-register event)]
(chainable-standard
(fn [pnod]
(if (and (= :resize event) (identical? js/window pnod)) ;support window resize
(events/listen (get-vp-monitor) "resize" func)
(if (nil? wrapper)
(events/listen pnod (name event) func)
(events/listenWithWrapper pnod wrapper func)))))))
(defn en-remove-listeners
"removing all listeners of a given event type from the selected nodes"
[& event-list]
(let [get-name #(name (cond
(= % :mouseenter) :mouseover
(= % :mouseleave) :mouseout
:else %))]
(chainable-standard
(fn [pnod]
(doseq [ev event-list] (events/removeAll pnod (get-name ev)))))))
(defn en-unlisten
"removing a specific event from the selected nodes"
([event] (en-remove-listeners event))
([event func]
(let [wrapper (wrapper-register event)]
(chainable-standard
(fn [pnod]
(if (nil? wrapper)
(events/unlisten pnod (name event) func)
(events/unlistenWithWrapper pnod wrapper func)))))))
;####################################################
; effect based transforms
;####################################################
(defn en-fade-out
"fade the selected nodes over a set of steps"
[ttime callback accel]
(chainable-effect
(fn [pnod pcallback]
(let [anim (fx-dom/FadeOut. pnod ttime accel)]
(when pcallback
(events/listen anim goog.fx.Animation.EventType/END pcallback))
(. anim (play))))
callback))
(defn en-fade-in
"fade the selected nodes over a set of steps"
[ttime callback accel]
(chainable-effect
(fn [pnod pcallback]
(let [anim (fx-dom/FadeIn. pnod ttime accel)]
(when pcallback
(events/listen anim goog.fx.Animation.EventType/END pcallback))
(. anim (play))))
callback))
(defn en-resize
"resizes the selected elements to a width and height in px optional time series data"
[wth hgt ttime callback accel]
(chainable-effect
(fn [pnod pcallback]
(let [csize (style/getContentBoxSize pnod)
start (array (.-width csize) (.-height csize))
wth (if (= :curwidth wth) (.-width csize) wth)
hgt (if (= :curheight hgt) (.-height csize) hgt)
end (array wth hgt)
anim (fx-dom/Resize. pnod start end ttime accel)]
(when pcallback
(events/listen anim goog.fx.Animation.EventType/END pcallback))
(. anim (play))))
callback))
(defn en-move
"moves the selected elements to a x and y in px optional time series data "
[xpos ypos ttime callback accel]
(chainable-effect
(fn [pnod pcallback]
(let [cpos (style/getPosition pnod)
start (array (.-x cpos) (.-y cpos))
xpos (if (= :curx xpos) (.-x cpos) xpos)
ypos (if (= :cury ypos) (.-y cpos) ypos)
end (array xpos ypos)
anim (fx-dom/Slide. pnod start end ttime accel)]
(when pcallback
(events/listen anim goog.fx.Animation.EventType/END pcallback))
(. anim (play))))
callback))
;##################################################################
; data extractors
;##################################################################
(defn en-get-attr
"returns the attribute on the selected element or elements.
in cases where more than one element is selected you will
receive a list of values"
[attr]
(extr-multi-node
(fn[pnod]
(. pnod (getAttribute (name attr))))))
(defn en-get-text
"returns the attribute on the selected element or elements.
in cases where more than one element is selected you will
receive a list of values"
[]
(extr-multi-node
(fn[pnod]
(dom/getTextContent pnod))))
(defn en-get-data
"returns the data on a selected node for a given key. If bubble is set will look at parent"
([ky] (en-get-data ky false))
([ky bubble]
(extr-multi-node
(fn [node]
(domina/get-data ky bubble)))))
;##################################################################
; filtering - these funcitons are to make up for choosing
; css3 selectors as our selectors, not everything can
; be selected with css selectors in all browser so this
; provides an abstract way to add additional selection
; criteria
;##################################################################
;registerd filter that can be refrenced by keyword
(def reg-filt (atom {}))
(defn en-filter
"filter allows you to apply function to futhur scope down what is returned by a selector"
[tst trans]
(fn filt
([pnodes] (filt pnodes nil))
([pnodes chain]
(let [pnod-col (nodes->coll pnodes)
ttest (if (keyword? tst) (@reg-filt tst) tst)
res (filter ttest pnod-col)]
(if (nil? chain)
(trans res)
(trans res chain))))))
(defn register-filter
"registers a filter for a given keyword"
[ky func]
(swap! reg-filt assoc ky func))
(defn selected-options
"takes a list of options and returns the selected ones. "
[pnod]
(.-selected pnod))
(defn checked-radio-checkbox
"takes a list of radio or checkboxes and returns the checked ones"
[pnod]
(.-checked pnod))
(register-filter :selected selected-options)
(register-filter :checked checked-radio-checkbox)
;##################################################################
; functions involved in processing the selectors
;##################################################################
(defn- create-sel-str
"converts keywords, symbols and strings used in the enlive selector
syntax to a string representing a standard css selector. It also
applys id masking if mask provided"
([css-sel] (create-sel-str "" css-sel))
([id-mask-sym css-sel]
(apply str (map #(cond
(symbol? %) (css-syms %)
(keyword? %) (str " " (. (name %) (replace "#" (str "#" id-mask-sym))))
(vector? %) (create-sel-str %)
(string? %) (.replace % "#" (str "#" id-mask-sym)))
css-sel))))
(defn css-select
"takes either an enlive selector or a css3 selector and returns a set of nodes that match the selector"
([css-sel] (css-select "" js/document css-sel))
([dom-node css-sel] (css-select "" dom-node css-sel))
([id-mask-sym dom-node css-sel]
(log-debug dom-node)
(log-debug (pr-str css-sel))
;(log-debug id-mask-sym)
(let [sel (string/trim (en/convert (create-sel-str id-mask-sym css-sel)))
ret (dcss/sel dom-node sel)]
ret)))
;###############################################
; Core functions and supporting fuctions for
; for "at" and "from"
;###############################################
(defn nil-t [func]
(or func en-remove-node))
(defn i-at [id-mask node & trans]
(if (= 1 (count trans))
((first trans) node)
(doseq [[sel t] (partition 2 trans)]
((nil-t t) (css-select id-mask node sel)))))
(defn at [node & trans]
(apply i-at "" node trans))
(defn from [node & trans]
(if (= 1 (count trans))
((first trans) node)
(apply hash-map
(mapcat (fn [[ky sel ext]]
[ky (ext (css-select "" node sel))])
(partition 3 trans)))))
;;domina extentions to work with enfocus
(extend-protocol domina/DomContent
js/Text
(nodes [content] [content])
(single-node [content] content))