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261 lines
6.5 KiB
JavaScript
261 lines
6.5 KiB
JavaScript
dojo.provide("dojox.image.LightboxNano");
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dojo.require("dojo.fx");
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(function(d){
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var getViewport = function(){
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// summary: Returns the dimensions and scroll position of the viewable area of a browser window
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var scrollRoot = (d.doc.compatMode == "BackCompat") ? d.body() : d.doc.documentElement,
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scroll = dojo._docScroll();
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return { w: scrollRoot.clientWidth, h: scrollRoot.clientHeight, l: scroll.x, t: scroll.y };
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},
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abs = "absolute";
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d.declare("dojox.image.LightboxNano", null, {
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// summary:
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// A simple "nano" version of the lightbox.
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//
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// description:
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// Very lightweight lightbox which only displays a larger image. There is
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// no support for a caption or description. The lightbox can be closed by
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// clicking any where or pressing any key. This widget is intended to be
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// used on <a> and <img> tags. Upon creation, if the domNode is <img> tag,
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// then it is wrapped in an <a> tag, then a <div class="enlarge"> is placed
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// inside the <a> and can be styled to display an icon that the original
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// can be enlarged.
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//
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// example:
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// | <a dojoType="dojox.image.LightboxNano" href="/path/to/largeimage.jpg"><img src="/path/to/thumbnail.jpg"></a>
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//
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// example:
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// | <img dojoType="dojox.image.LightboxNano" src="/path/to/thumbnail.jpg" href="/path/to/largeimage.jpg">
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// href: string
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// URL to the large image to show in the lightbox.
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href: "",
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// duration: int
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// The delay in milliseconds of the LightboxNano open and close animation.
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duration: 500,
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// preloadDelay: int
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// The delay in milliseconds after the LightboxNano is created before preloading the larger image.
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preloadDelay: 5000,
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constructor: function(p, n){
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// summary: Initializes the DOM node and connect onload event
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var _this = this;
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d.mixin(_this, p);
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n = dojo.byId(n);
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if(!/a/i.test(n.tagName)){
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var a = d.create("a", { href: _this.href, "class": n.className }, n, "after");
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n.className = "";
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a.appendChild(n);
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n = a;
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}
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d.style(n, {
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display: "block",
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position: "relative"
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});
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_this._createDiv("dojoxEnlarge", n);
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_this._node = n;
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d.setSelectable(n, false);
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_this._onClickEvt = d.connect(n, "onclick", _this, "_load");
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setTimeout(function(){
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(new Image()).src = _this.href;
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_this._hideLoading();
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}, _this.preloadDelay);
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},
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destroy: function(){
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// summary: Destroys the LightboxNano and it's DOM node
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var a = this._connects || [];
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a.push(this._onClickEvt);
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d.forEach(a, d.disconnect);
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d.destroy(this._node);
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},
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_createDiv: function(/*String*/cssClass, /*DomNode*/refNode, /*boolean*/display){
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// summary: Creates a div for the enlarge icon and loading indicator layers
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return d.create("div", { "class": cssClass, style: { position: abs, display: display ? "" : "none" } }, refNode); // DomNode
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},
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_load: function(/*Event*/e){
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// summary: Creates the large image and begins to show it
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var _this = this;
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d.stopEvent(e);
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if(!_this._loading){
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_this._loading = true;
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_this._reset();
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var n = d.query("img", _this._node)[0],
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a = d._abs(n, true),
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c = d.contentBox(n),
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b = d._getBorderExtents(n),
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i = _this._img = d.create("img", {
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style: {
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visibility: "hidden",
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cursor: "pointer",
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position: abs,
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top: 0,
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left: 0,
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zIndex: 9999999
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}
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}, d.body()),
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ln = _this._loadingNode;
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if(ln == null){
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_this._loadingNode = ln = _this._createDiv("dojoxLoading", _this._node, true)
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var l = d.marginBox(ln);
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d.style(ln, {
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left: parseInt((c.w - l.w) / 2) + "px",
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top: parseInt((c.h - l.h) / 2) + "px"
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});
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}
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c.x = a.x - 10 + b.l;
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c.y = a.y - 10 + b.t;
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_this._start = c;
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_this._connects = [d.connect(i, "onload", _this, "_show")];
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i.src = _this.href;
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}
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},
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_hideLoading: function(){
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// summary: Hides the animated loading indicator
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if(this._loadingNode){
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d.style(this._loadingNode, "display", "none");
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}
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this._loadingNode = false;
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},
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_show: function(){
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// summary: The image is now loaded, calculate size and display
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var _this = this,
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vp = getViewport(),
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w = _this._img.width,
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h = _this._img.height,
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vpw = parseInt((vp.w - 20) * 0.9),
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vph = parseInt((vp.h - 20) * 0.9),
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dd = d.doc,
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bg = _this._bg = d.create("div", {
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style: {
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backgroundColor: "#000",
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opacity: 0.0,
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position: abs,
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zIndex: 9999998
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}
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}, d.body()),
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ln = _this._loadingNode;
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if(_this._loadingNode){
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_this._hideLoading();
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}
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d.style(_this._img, {
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border: "10px solid #fff",
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visibility: "visible"
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});
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d.style(_this._node, "visibility", "hidden");
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_this._loading = false;
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_this._connects = _this._connects.concat([
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d.connect(dd, "onmousedown", _this, "_hide"),
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d.connect(dd, "onkeypress", _this, "_key"),
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d.connect(window, "onresize", _this, "_sizeBg")
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]);
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if(w > vpw){
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h = h * vpw / w;
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w = vpw;
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}
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if(h > vph){
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w = w * vph / h;
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h = vph;
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}
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_this._end = {
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x: (vp.w - 20 - w) / 2 + vp.l,
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y: (vp.h - 20 - h) / 2 + vp.t,
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w: w,
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h: h
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};
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_this._sizeBg();
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d.fx.combine([
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_this._anim(_this._img, _this._coords(_this._start, _this._end)),
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_this._anim(bg, { opacity: 0.5 })
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]).play();
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},
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_sizeBg: function(){
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// summary: Resize the background to fill the page
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var dd = d.doc.documentElement;
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d.style(this._bg, {
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top: 0,
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left: 0,
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width: dd.scrollWidth + "px",
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height: dd.scrollHeight + "px"
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});
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},
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_key: function(/*Event*/e){
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// summary: A key was pressed, so hide the lightbox
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d.stopEvent(e);
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this._hide();
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},
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_coords: function(/*Object*/s, /*Object*/e){
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// summary: Returns animation parameters with the start and end coords
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return {
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left: { start: s.x, end: e.x },
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top: { start: s.y, end: e.y },
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width: { start: s.w, end: e.w },
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height: { start: s.h, end: e.h }
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}; // object
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},
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_hide: function(){
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// summary: Closes the lightbox
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var _this = this;
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d.forEach(_this._connects, d.disconnect);
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_this._connects = [];
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d.fx.combine([
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_this._anim(_this._img, _this._coords(_this._end, _this._start), "_reset"),
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_this._anim(_this._bg, {opacity:0})
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]).play();
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},
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_reset: function(){
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// summary: Destroys the lightbox
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d.style(this._node, "visibility", "visible");
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d.forEach([this._img, this._bg], function(n){
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d.destroy(n);
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n = null;
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});
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this._node.focus();
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},
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_anim: function(node, args, onEnd){
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// summary: Creates the lightbox open/close and background fadein/out animations
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return d.animateProperty({
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node: node,
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duration: this.duration,
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properties: args,
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onEnd: onEnd ? d.hitch(this, onEnd) : null
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}); // object
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}
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});
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})(dojo);
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