177 lines
4.9 KiB
JavaScript
177 lines
4.9 KiB
JavaScript
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var Render = function(){
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function newElement(elementType) {
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var e = document.createElement(elementType);
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e.style.padding = "0";
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e.style.margin = "0";
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return e;
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};
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function addTo(container, elem) {
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container.appendChild(elem);
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};
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function makeText(pos,txt) {
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var e = newElement('div');
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e.innerHTML = txt;
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e.style.textAlign = pos;
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return e;
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};
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function image(src) {
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var img = newElement('img');
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img.src = Value.toText(src);
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img.name = img.src;
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return img;
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}
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function fittedImage(w,h,src) {
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var canvas = newElement('canvas');
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canvas.style.width = w + 'px';
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canvas.style.height = h + 'px';
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canvas.width = w;
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canvas.height = h;
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canvas.innerHTML = "Your browser does not support the canvas element.";
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var img = newElement('img');
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img.onload = function() {
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if (canvas.getContext) {
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var ctx = canvas.getContext('2d');
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var sx = 0, sy = 0, sWidth = this.width, sHeight = this.height;
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if (w / h > this.width / this.height) {
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sHeight = this.width * h / w;
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sy = (this.height - sHeight) / 2;
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} else {
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sWidth = this.height * w / h;
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sx = (this.width - sWidth) / 2;
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}
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ctx.drawImage(img, sx, sy, sWidth, sHeight,
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0,0, canvas.width, canvas.height);
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}
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};
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img.src = Value.toText(src);
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return canvas;
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};
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var video = function(src) {
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src = Value.toText(src);
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var e = newElement('video');
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e.controls = "controls";
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var source = newElement('source');
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source.src = src;
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var segs = src.split('.');
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source.type = "video/" + segs[segs.length-1];
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addTo(e, source);
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return e;
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};
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function divify(e) {
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var div = newElement('div');
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addTo(div, e);
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return div;
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};
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function goDown(e) {
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return e //.tagName === "DIV" ? e : divify(e);
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};
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function goRight(e) {
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e.style.styleFloat = "left";
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e.style.cssFloat = "left";
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return e;
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};
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function goIn(e) {
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e.style.position = 'absolute';
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return e;
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};
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function flowWith(f, prep, elist) {
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var container = newElement('div');
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for (var i = elist.length; i--; ) {
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addTo(container, f(prep(elist[i])));
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}
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return container;
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};
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function flow(dir,elist) {
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switch(dir) {
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case "DDown": elist = elist.slice(0).reverse();
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case "DUp": return flowWith(goDown,render,elist);
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case "DRight": elist = elist.slice(0).reverse();
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case "DLeft": return flowWith(goRight,render,elist);
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case "DOut": elist = elist.slice(0).reverse();
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case "DIn": return flowWith(goIn,render,elist);
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};
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};
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function render(elem) {
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var e = {};
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switch(elem[2][0]) {
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case "EText": e = makeText(elem[2][1],elem[2][2]); break;
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case "EImage": e = image(elem[2][1]); break;
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case "EVideo": e = video(elem[2][1]); break;
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case "EFittedImage": e = fittedImage(elem[3],elem[4],elem[2][1]); break;
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case "EFlow": e = flow(elem[2][1][0],elem[2][2]); break;
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case "ECollage": e = Collage.collage(elem[2][1],elem[2][2],elem[2][3]); break;
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case "EEmpty": e = newElement('div'); break;
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case "EContainer":
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e = newElement('div');
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}
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e.id = elem[1];
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e.style.width = (~~elem[3]) + 'px';
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e.style.height = (~~elem[4]) + 'px';
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if (elem[5] !== 1) { e.style.opacity = elem[5]; }
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if (elem[6][0] === "Just") {
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e.style.color = ElmCode.Graphics.Color.extract(elem[6][1]);
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}
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return e;
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};
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function update(node,curr,next) {
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if (curr[1] === next[1]) return;
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if (curr[2][0] !== next[2][0]) {
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node.parentNode.replaceChild(render(next),node);
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}
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var nextE = next[2], currE = curr[2];
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switch(nextE[0]) {
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case "EText":
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if (nextE[1] !== currE[1]) node.innerHTML = Value.toText(nextE[1]);
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break;
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case "EImage":
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if (nextE[1] !== currE[1]) node.src = nextE[1];
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break;
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case "EVideo":
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case "EFittedImage":
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if (Value.eq(nextE,currE)) break;
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return node.parentNode.replaceChild(render(next),node);
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case "ECollage":
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if (nextE[1] !== currE[1] || nextE[2] !== currE[2]) {
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return node.parentNode.replaceChild(render(nextE),node);
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}
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Collage.updateCollage(node,currE[3],nextE[3]);
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break;
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case "EFlow":
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if (nextE[1] !== currE[1])
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return node.parentNode.replaceChild(render(next),node);
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var nexts = nextE[2];
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var kids = node.childNodes;
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if (nexts.length !== kids.length)
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return node.parentNode.replaceChild(render(next),node);
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var currs = currE[2];
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for (var i = kids.length ; i-- ; ) {
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update(kids[i],currs[i],nexts[i]);
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}
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case "EContainer":
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case "EEmpty":
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}
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if (next[3] !== curr[3]) node.style.width = (~~next[3]) + 'px';
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if (next[4] !== curr[4]) node.style.height = (~~next[4]) + 'px';
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if (next[5] !== curr[5]) node.style.opacity = next[5];
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if (next[6].length === 2) {
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var clr = ElmCode.Graphics.Color.extract(next[6][1]);
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if (clr !== node.style.color) node.style.color = clr;
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}
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next[1] = curr[1];
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}
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return {render:render,update:update,addTo:addTo,newElement:newElement,flowWith:flowWith,goIn:goIn};
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}();
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