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dom.cljs
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dom.cljs
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(ns shadow.dom
(:refer-clojure :exclude [remove contains? parents])
(:require-macros [cljs.core.async.macros :refer (go)])
(:require [goog.dom :as dom]
[goog.dom.forms :as gf]
[goog.dom.classlist :as gcls]
[goog.style :as gs]
[goog.style.transition :as gst]
[goog.string :as gstr]
[clojure.string :as str]
[cljs.core.async :as async]))
(def transition-supported?
(when (exists? js/window)
(gst/isSupported)))
(defprotocol IElement
(-to-dom [this]))
(defprotocol SVGElement
(-to-svg [this]))
(defn- lazy-native-coll-seq [coll idx]
(when (< idx (.-length coll))
(lazy-seq (cons (aget coll idx)
(lazy-native-coll-seq coll (inc idx))))
))
(deftype NativeColl [coll]
IDeref
(-deref [this] coll)
IIndexed
(-nth [this n] (aget coll n))
(-nth [this n not-found] (or (aget coll n) not-found))
ICounted
(-count [this] (.-length coll))
ISeqable
(-seq [this] (lazy-native-coll-seq coll 0))
IElement
(-to-dom [this] coll)
)
(defn native-coll [coll]
(NativeColl. coll))
(defn dom-node [el]
;; FIXME: this method is called alot, how expensive is this check?
;; protocols on native elements are funky
(cond
(nil? el) nil
(implements? IElement el) (-to-dom ^not-native el)
(string? el) (.createTextNode js/document el)
(number? el) (.createTextNode js/document (str el))
:else el))
(def build dom-node)
(defn ev-stop
([e]
(if (.-stopPropagation e)
(do
(.stopPropagation e)
(.preventDefault e))
(do
(set! (.-cancelBubble e) true)
(set! (.-returnValue e) false)))
e)
([e el]
(ev-stop e)
el)
;; new arity for sc/on
([e el scope owner]
(ev-stop e)
el))
(defn contains?
"check wether a parent node (or the document) contains the child"
([el]
(dom/contains js/document (dom-node el)))
([parent el]
(dom/contains (dom-node parent) (dom-node el))))
(defn add-class [el cls]
(gcls/add (dom-node el) cls))
(defn remove-class [el cls]
(gcls/remove (dom-node el) cls))
(defn toggle-class
([el cls]
(gcls/toggle (dom-node el) cls))
([el cls v]
(if v
(add-class el cls)
(remove-class el cls))))
(defn has-class? [el cls]
(gcls/contains (dom-node el) cls))
(defn- merge-class-string [current extra-class]
(if (seq current)
(str current " " extra-class)
extra-class))
;; before strange code!!!
;; just because I can and messing with a huge regexp sucks
;; messing with a native javascript object should also be faster
(defn parse-tag [spec]
(let [spec (name spec)
fdot (.indexOf spec ".")
fhash (.indexOf spec "#")]
(cond
(and (= -1 fdot) (= -1 fhash))
[spec nil nil]
(= -1 fhash)
[(.substring spec 0 fdot)
nil
(str/replace (.substring spec (inc fdot)) #"\." " ")]
(= -1 fdot)
[(.substring spec 0 fhash)
(.substring spec (inc fhash))
nil]
(> fhash fdot)
(throw (str "cant have id after class?" spec))
:else
[(.substring spec 0 fhash)
(.substring spec (inc fhash) fdot)
(str/replace (.substring spec (inc fdot)) #"\." " ")])))
(defn create-dom-node [tag-def props]
(let [props (clj->js props)
[tag-name tag-id tag-classes] (parse-tag tag-def)]
(when tag-id
(aset props "id" tag-id))
(when tag-classes
(aset props "class" (merge-class-string (aget props "class") tag-classes)))
(dom/createDom tag-name props)
))
;; FIXME: throw on nil? trying to append nil should be an error, not ignored
(defn append
([node]
(when node
(when-let [n (dom-node node)]
(.appendChild (.-body js/document) n)
n)))
([el node]
(when node
(when-let [n (dom-node node)]
(.appendChild (dom-node el) n)
n))))
(defn destructure-node
[create-fn [nn np & nc :as node]]
(when-not (keyword? nn)
(throw (ex-info "invalid dom node" {:node node})))
(cond
(and (nil? np) (nil? nc)) ;; [:div.something]
[(create-fn nn {}) '()]
(map? np) ;; [:div.something {:some "attr"}]
[(create-fn nn np) nc]
:else ;; [:div.something "content" "more-content"]
[(create-fn nn {}) (conj nc np)]))
;; restore sanity!
(defn make-dom-node [structure]
(let [[node node-children] (destructure-node create-dom-node structure)]
(doseq [child-struct node-children]
(let [children (dom-node child-struct)]
(if (seq? children)
(doseq [child (map dom-node children)
:when child]
(append node child))
(do
(append node children)))))
node))
(extend-protocol IElement
Keyword
(-to-dom [this] (make-dom-node [this]))
PersistentVector
(-to-dom [this]
(make-dom-node this))
LazySeq
(-to-dom [this]
(map -to-dom this)))
(when (js* "((typeof HTMLElement) != 'undefined')")
(extend-protocol IElement
js/HTMLElement
(-to-dom [this] this)
))
(when (js* "((typeof DocumentFragment) != 'undefined')")
(extend-protocol IElement
js/DocumentFragment
(-to-dom [this] this)
))
(defn query-one
([sel] (.querySelector js/document sel))
([sel root] (.querySelector (dom-node root) sel)))
(defn query
([sel] (NativeColl. (.querySelectorAll js/document sel)))
([sel root] (NativeColl. (.querySelectorAll (dom-node root) sel))))
;; private, use on
(def dom-listen
(if (or (not (exists? js/document))
(.-addEventListener js/document))
(fn dom-listen-good [el ev handler]
(.addEventListener el ev handler false))
(fn dom-listen-ie [el ev handler]
(try
(.attachEvent el (str "on" ev) (fn [e] (handler e el)))
(catch js/Object e
(.log js/console "didnt support attachEvent" el e)))
)))
;; private, only works if you used dom-listen since on wrap the event handler
(def dom-listen-remove
(if (or (not (exists? js/document))
(.-removeEventListener js/document))
(fn dom-listen-remove-good [el ev handler]
(.removeEventListener el ev handler false))
(fn dom-listen-remove-ie [el ev handler]
(.detachEvent el (str "on" ev) handler))
))
;; // private
(defn on-query [root-el ev selector handler]
(doseq [el (query selector root-el)]
(let [handler (fn [e] (handler e el))]
(dom-listen el (name ev) handler))))
(defn on
([el ev handler]
(on el ev handler false))
([el ev handler capture]
(if (vector? ev)
(on-query el (first ev) (second ev) handler)
(let [handler (fn [e] (handler e el))]
(dom-listen (dom-node el) (name ev) handler)))))
;; only work when used with dom-listen, on will wrap the handler so you can't remove it
(defn remove-event-handler [el ev handler]
(dom-listen-remove (dom-node el) (name ev) handler))
(defn by-id
([id el] (.getElementById (dom-node el) id))
([id] (.getElementById js/document id)))
(defn reset
"clear node children"
[node]
(dom/removeChildren (dom-node node)))
(defn remove [node]
(if (implements? ISeqable node)
(doseq [n node] (remove n))
(dom/removeNode node)))
(defn replace-node [old new]
;; wth reverse
(dom/replaceNode (dom-node new) (dom-node old)))
(defn text
([el new-text] (set! (.-innerText (dom-node el)) new-text))
([el] (.-innerText (dom-node el))))
(defn check
([el] (check el true))
([el checked]
(set! (.-checked (dom-node el)) checked)
))
(defn checked? [el] (.-checked (dom-node el)))
(defn form-elements [el]
(NativeColl. (.-elements (dom-node el))))
(defn children [el]
(NativeColl. (.-children (dom-node el))))
(defn child-nodes [el]
(NativeColl. (.-childNodes (dom-node el))))
(defn attr
([el key] (.getAttribute (dom-node el) (name key)))
([el key default] (or (.getAttribute (dom-node el) (name key)) default)))
(defn set-style [el styles]
(let [dom (dom-node el)]
;; apparently IE10+ allows setting properties to null which has unexpected effects
;; on transition and display.
(doseq [[k v] styles]
(gs/setStyle dom (name k) (if (nil? v)
""
v)))))
(defn set-attr* [el key value]
;; basically clone of goog.dom.setProperties, but with keywords
(case key
:id (set! (.-id el) (str value))
:class (set! (.-className el) (str value))
:for (set! (.-htmlFor el) value)
;; see goog.dom.DIRECT_ATTRIBUTE_MAP_
:cellpadding (.setAttribute el "cellPadding" value)
:cellspacing (.setAttribute el "cellSpacing" value)
:colspan (.setAttribute el "colSpan" value)
:frameborder (.setAttribute el "frameBorder" value)
:height (.setAttribute el "height" value)
:maxlength (.setAttribute el "maxLength" value)
:role (.setAttribute el "role" value)
:rowspan (.setAttribute el "rowSpan" value)
:type (.setAttribute el "type" value)
:usemap (.setAttribute el "useMap" value)
:valign (.setAttribute el "vAlign" value)
:width (.setAttribute el "width" value)
:style (cond
(nil? value)
nil
(string? value)
(.setAttribute el "style" value)
(map? value)
(set-style el value)
:else
(gs/setStyle el value))
;; FIXME: support :style maps
(let [ks (name key)]
(if (or (gstr/startsWith ks "data-")
(gstr/startsWith ks "aria-"))
(.setAttribute el ks value)
(aset el ks value))))
el)
(defn set-attrs [el attrs]
(reduce-kv
(fn [el key value]
;; use special version, so we don't do (dom-node el) every time
(set-attr* el key value)
el)
(dom-node el)
attrs))
(defn set-attr [el key value]
(set-attr* (dom-node el) key value))
(defn del-attr [el key]
(.removeAttribute (dom-node el) (name key)))
(defn data [el key]
(.getAttribute (dom-node el) (str "data-" (name key))))
(defn set-data [el key value]
(.setAttribute (dom-node el) (str "data-" (name key)) (str value)))
(defn set-html [node text]
(set! (.-innerHTML (dom-node node)) text))
(defn get-html [node]
(.-innerHTML (dom-node node)))
(defn fragment [& nodes]
(let [fragment (.createDocumentFragment js/document)]
(doseq [node nodes]
(.appendChild fragment (-to-dom node)))
(NativeColl. fragment)
))
(defn eval-scripts
"given a html string, eval all <script> tags and return the html without the scripts
don't do this for everything, only content you trust."
[s]
(let [scripts (re-seq #"<script[^>]*?>(.+?)</script>" s)]
(doseq [[script-tag script-body] scripts]
(js/eval script-body))
(reduce (fn [s [script-tag script-body]]
(str/replace s script-tag ""))
s
scripts)
))
(defn str->fragment [s]
(let [el (js/document.createElement "div")]
(set! (.-innerHTML el) s)
(NativeColl. (dom/childrenToNode_ js/document el))))
(defn node-name [el]
(.-nodeName (dom-node el)))
(defn ancestor-by-class [el cls]
(dom/getAncestorByClass (dom-node el) cls))
(defn ancestor-by-tag
([el tag] (dom/getAncestorByTagNameAndClass (dom-node el) (name tag)))
([el tag cls] (dom/getAncestorByTagNameAndClass (dom-node el) (name tag) (name cls))))
(defn get-value [dom]
(gf/getValue (dom-node dom)))
(defn set-value [dom value]
(gf/setValue (dom-node dom) value))
(defn px [value]
(str (int value) "px"))
(defn pct [value]
(str value "%"))
(defn remove-style* [el style]
(.removeProperty (.-style el) (name style)))
(defn remove-style [el style]
(let [el (dom-node el)]
(remove-style* el style)))
(defn remove-styles [el style-keys]
(let [el (dom-node el)]
(doseq [it style-keys]
(remove-style* el it))))
(defrecord Coordinate [x y])
(defn get-position [el]
(let [pos (gs/getPosition (dom-node el))]
(->Coordinate (.-x pos) (.-y pos))))
(defn get-client-position [el]
(let [pos (gs/getClientPosition (dom-node el))]
(->Coordinate (.-x pos) (.-y pos))))
(defn get-page-offset [el]
(let [pos (gs/getPageOffset (dom-node el))]
(->Coordinate (.-x pos) (.-y pos))))
(defrecord Size [w h])
(defn size->clj [size]
(Size. (.-width size) (.-height size)))
(defn get-size [el]
(size->clj (gs/getSize (dom-node el))))
(defn get-height [el]
(-> el get-size :h))
(defn get-viewport-size []
(size->clj (dom/getViewportSize)))
(defn first-child [el]
(aget (.-children (dom-node el)) 0))
(defn select-option-values [el]
(let [native (dom-node el)
opts (aget native "options")]
(areduce opts i ret []
(conj ret (aget opts i "value")))
))
(defn build-url [path query-params]
(if (empty? query-params)
path
(str path "?" (str/join "&" (map (fn [[k v]]
(str (name k) "=" (js/encodeURIComponent (str v))))
query-params)))
))
(defn redirect
([path]
(redirect path {}))
([path query-params]
(aset js/document "location" "href" (build-url path query-params))
))
(defn reload! []
(set! (.. js/document -location -href)
(.. js/document -location -href)))
(defn tag-name [el]
(let [dom (dom-node el)]
(.-tagName dom)))
(defn insert-after [ref new]
(let [new-node (dom-node new)]
(dom/insertSiblingAfter new-node (dom-node ref))
new-node))
(defn insert-before [ref new]
(let [new-node (dom-node new)]
(dom/insertSiblingBefore new-node (dom-node ref))
new-node))
(defn insert-first [ref new]
(if-let [child (.-firstChild (dom-node ref))]
(insert-before child new)
(append ref new)))
(defn index-of [el]
(loop [el (dom-node el)
i 0]
(let [ps (.-previousSibling el)]
(if (nil? ps)
i
(recur ps (inc i))
))))
(defn get-parent [el]
(dom/getParentElement (dom-node el)))
(defn parents [el]
(let [parent (get-parent el)]
(when parent
(cons parent (lazy-seq (parents parent))))))
(defn matches [el sel]
(.matches (dom-node el) sel))
(defn get-next-sibling [el]
(dom/getNextElementSibling (dom-node el)))
(defn get-previous-sibling [el]
(dom/getPreviousElementSibling (dom-node el)))
(def xmlns (atom {"svg" "http://www.w3.org/2000/svg"
"xlink" "http://www.w3.org/1999/xlink"}))
(defn create-svg-node [tag-def props]
(let [[tag-name tag-id tag-classes] (parse-tag tag-def)]
(let [el (.createElementNS js/document "http://www.w3.org/2000/svg" tag-name)]
(when tag-id
(.setAttribute el "id" tag-id))
(when tag-classes
(.setAttribute el "class" (merge-class-string (:class props) tag-classes)))
(doseq [[k v] props]
(.setAttributeNS el
(when-let [ns (namespace k)]
(get @xmlns ns))
(name k) v))
el
)))
(defn svg-node [el]
(cond
(nil? el) nil
(implements? SVGElement el) (-to-svg ^not-native el)
:else el))
(defn make-svg-node [structure]
(let [[node node-children] (destructure-node create-svg-node structure)]
(doseq [child-struct node-children
:when (not (nil? child-struct))]
(if (string? child-struct)
(let [text (aget node "textContent")]
(aset node "textContent" (str text child-struct)))
(let [children (svg-node child-struct)]
(if (seq? children)
(doseq [child children
:when child]
(.appendChild node child))
(.appendChild node children)))))
node))
(extend-protocol SVGElement
string
(-to-svg [this]
(if (keyword? this)
(make-svg-node [this])
(throw (ex-info "strings cannot be in svgs" {:this this}))))
PersistentVector
(-to-svg [this]
(make-svg-node this))
LazySeq
(-to-svg [this]
(map -to-svg this))
nil
(-to-svg [_] nil))
;; FIXME: could autodetect svg elements but that would mean checking
;; if tag == :svg for every node created in dom-node, that kinda sucks
(defn svg [attrs & children]
(-to-svg (vec (concat [:svg attrs] children))))
;; core.async stuff
(defn event-chan
"returns a channel for events on el
transform-fn should be a (fn [e el] some-val) where some-val will be put on the chan
once-or-cleanup handles the removal of the event handler
- true: remove after one event
- false: never removed
- chan: remove on msg/close"
([el event]
(event-chan el event nil false))
([el event xf]
(event-chan el event xf false))
([el event xf once-or-cleanup]
(let [buf (async/sliding-buffer 1)
chan (async/chan buf xf)
event-fn (fn event-fn [e]
(async/put! chan e)
(when (true? once-or-cleanup)
(remove-event-handler el event event-fn)
(async/close! chan)
))]
(dom-listen (dom-node el) (name event) event-fn)
;; when given a channel fire up a go that removes event handler when closed/msg
(when (and once-or-cleanup
(not (true? once-or-cleanup)))
(go (<! once-or-cleanup)
(remove-event-handler el event event-fn)))
chan
)))