runtime/Render/Element.js · elk · git.iko.soy

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elk/runtime/Render/Element.js

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2ElmRuntime.Render.Element = function() {

3'use strict';

5var Utils = ElmRuntime.use(ElmRuntime.Render.Utils);

6var newElement = Utils.newElement, extract = Utils.extract,

7 addTransform = Utils.addTransform, removeTransform = Utils.removeTransform,

8 fromList = Utils.fromList, eq = Utils.eq;

10function setProps(elem, e) {

11 var props = elem.props;

12 var element = elem.element;

13 if (element.adjustWidth) {

14 props.width -= element.adjustWidth;

15 }

16 if (element.adjustHeight) {

17 props.height -= element.adjustHeight;

18 }

19 e.style.width = (props.width |0) + 'px';

20 e.style.height = (props.height|0) + 'px';

21 if (props.opacity !== 1) { e.style.opacity = props.opacity; }

22 if (props.color.ctor === 'Just') {

23 e.style.backgroundColor = extract(props.color._0);

24 }

25 if (props.tag !== '') { e.id = props.tag; }

26 if (props.href !== '') {

27 var a = newElement('a');

28 a.href = props.href;

29 a.style.width = '100%';

30 a.style.height = '100%';

31 a.style.top = 0;

32 a.style.left = 0;

33 a.style.display = 'block';

34 a.style.position = 'absolute';

35 e.style.position = 'relative';

36 e.appendChild(a);

37 }

38 if (props.hover.ctor !== '_Tuple0') {

39 e.style.pointerEvents = 'auto';

40 e.elm_hover_handler = props.hover;

41 e.elm_hover_count = 0;

42 e.addEventListener('mouseover', function() {

43 if (e.elm_hover_count++ > 0) return;

44 var handler = e.elm_hover_handler;

45 if (handler !== null) {

46 handler(true);

47 }

48 });

49 e.addEventListener('mouseout', function(evt) {

50 if (e.contains(evt.toElement || evt.relatedTarget)) return;

51 e.elm_hover_count = 0;

52 var handler = e.elm_hover_handler;

53 if (handler !== null) {

54 handler(false);

55 }

56 });

57 }

58 if (props.click.ctor !== '_Tuple0') {

59 e.style.pointerEvents = 'auto';

60 e.elm_click_handler = props.click;

61 e.addEventListener('click', function() {

62 e.elm_click_handler(Tuple0);

63 });

64 }

65 return e;

68function image(props, img) {

69 switch (img._0.ctor) {

70 case 'Plain': return plainImage(img._3);

71 case 'Fitted': return fittedImage(props.width, props.height, img._3);

72 case 'Cropped': return croppedImage(img,props.width,props.height,img._3);

73 case 'Tiled': return tiledImage(img._3);

74 }

77function plainImage(src) {

78 var img = newElement('img');

79 img.src = src;

80 img.name = src;

81 img.style.display = "block";

82 return img;

85function tiledImage(src) {

86 var div = newElement('div');

87 div.style.backgroundImage = 'url(' + src + ')';

88 return div;

91function fittedImage(w, h, src) {

92 var div = newElement('div');

93 div.style.background = 'url(' + src + ') no-repeat center';

94 div.style.webkitBackgroundSize = 'cover';

95 div.style.MozBackgroundSize = 'cover';

96 div.style.OBackgroundSize = 'cover';

97 div.style.backgroundSize = 'cover';

98 return div;

101function croppedImage(elem, w, h, src) {

102 var pos = elem._0._0;

103 var e = newElement('div');

104 e.style.overflow = "hidden";

106 var img = newElement('img');

107 img.onload = function() {

108 var sw = w / elem._1, sh = h / elem._2;

109 img.style.width = ((this.width * sw)|0) + 'px';

110 img.style.height = ((this.height * sh)|0) + 'px';

111 img.style.marginLeft = ((- pos._0 * sw)|0) + 'px';

112 img.style.marginTop = ((- pos._1 * sh)|0) + 'px';

113 };

114 img.src = src;

115 img.name = src;

116 e.appendChild(img);

117 return e;

120function goIn(e) { e.style.position = 'absolute'; return e; }

121function goDown(e) { return e }

122function goRight(e) { e.style.styleFloat = e.style.cssFloat = "left"; return e; }

123function flowWith(f, array) {

124 var container = newElement('div');

125 if (f == goIn) container.style.pointerEvents = 'none';

127 for (var i = array.length; i--; ) {

128 container.appendChild(f(render(array[i])));

129 }

130 return container;

133function flow(dir,elist) {

134 var array = fromList(elist);

135 switch(dir.ctor) {

136 case "DDown": array.reverse();

137 case "DUp": return flowWith(goDown,array);

138 case "DRight": array.reverse();

139 case "DLeft": return flowWith(goRight,array);

140 case "DOut": array.reverse();

141 case "DIn": return flowWith(goIn,array);

142 }

145function toPos(pos) {

146 switch(pos.ctor) {

147 case "Absolute": return pos._0 + "px";

148 case "Relative": return (pos._0 * 100) + "%";

149 }

152// must clear right, left, top, bottom, and transform

153// before calling this function

154function setPos(pos,w,h,e) {

155 e.style.position = 'absolute';

156 e.style.margin = 'auto';

157 var transform = '';

158 switch(pos.horizontal.ctor) {

159 case 'P': e.style.right = toPos(pos.x); e.style.removeProperty('left'); break;

160 case 'Z': transform = 'translateX(' + ((-w/2)|0) + 'px) ';

161 case 'N': e.style.left = toPos(pos.x); e.style.removeProperty('right'); break;

162 }

163 switch(pos.vertical.ctor) {

164 case 'N': e.style.bottom = toPos(pos.y); e.style.removeProperty('top'); break;

165 case 'Z': transform += 'translateY(' + ((-h/2)|0) + 'px)';

166 case 'P': e.style.top = toPos(pos.y); e.style.removeProperty('bottom'); break;

167 }

168 if (transform !== '') addTransform(e.style, transform);

169 return e;

172function container(pos,elem) {

173 var e = render(elem);

174 setPos(pos, elem.props.width, elem.props.height, e);

175 var div = newElement('div');

176 div.style.position = 'relative';

177 div.style.overflow = 'hidden';

178 div.appendChild(e);

179 return div;

182function rawHtml(elem) {

183 var html = elem.html;

184 var args = elem.args;

185 var guid = elem.guid;

186 var align = elem.align;

188 var div = newElement('div');

189 div.innerHTML = html;

190 div.style.visibility = "hidden";

191 if (align) div.style.textAlign = align;

192 document.body.appendChild(div);

194 for (var i = args.length; i--; ) {

195 var arg = args[i];

196 var span = document.getElementById('md-' + guid + '-' + i);

197 if (arg.isText) {

198 span.innerHTML = arg;

199 } else {

200 span.style.display = 'block';

201 span.style.width = arg.props.width + 'px';

202 span.style.height = arg.props.height + 'px';

203 span.appendChild(render(arg));

204 }

205 }

206 document.body.removeChild(div);

207 div.style.visibility = 'visible';

208 return div;

211function render(elem) { return setProps(elem, makeElement(elem)); }

212function makeElement(e) {

213 var elem = e.element;

214 switch(elem.ctor) {

215 case 'Image': return image(e.props, elem);

216 case 'Flow': return flow(elem._0, elem._1);

217 case 'Container': return container(elem._0, elem._1);

218 case 'Spacer': return newElement('div');

219 case 'RawHtml': return rawHtml(elem);

220 case 'Custom': return elem.render(elem.model);

221 }

224function update(node, curr, next) {

225 if (node.tagName === 'A') { node = node.firstChild; }

226 if (curr.props.id === next.props.id) return updateProps(node, curr, next);

227 if (curr.element.ctor !== next.element.ctor) {

228 node.parentNode.replaceChild(render(next),node);

229 return true;

230 }

231 var nextE = next.element, currE = curr.element;

232 switch(nextE.ctor) {

233 case "Spacer": break;

234 case "RawHtml":

235 // only markdown blocks have guids, so this must be a text block

236 if (nextE.guid === null) {

237 if(currE.html.valueOf() !== nextE.html.valueOf()) {

238 node.innerHTML = nextE.html;

239 }

240 break;

241 }

242 if (nextE.guid !== currE.guid) {

243 node.parentNode.replaceChild(render(next),node);

244 return true;

245 }

246 var nargs = nextE.args;

247 var cargs = currE.args;

248 for (var i = nargs.length; i--; ) {

249 var narg = nargs[i];

250 var carg = cargs[i]

251 if (narg == carg) continue;

252 var span = document.getElementById('md-' + currE.guid + '-' + i);

253 if (narg.isElement) {

254 if (carg.isElement) {

255 update(span, carg, narg);

256 } else {

257 span.style.display = 'block';

258 var e = render(narg);

259 span.innerHTML = '';

260 span.appendChild(e);

261 }

262 } else {

263 span.style.display = 'inline';

264 span.innerHTML = narg;

265 }

266 }

267 break;

268 case "Image":

269 if (nextE._0.ctor === 'Plain') {

270 if (nextE._3 !== currE._3) node.src = nextE._3;

271 } else if (!eq(nextE,currE) ||

272 next.props.width !== curr.props.width ||

273 next.props.height !== curr.props.height) {

274 node.parentNode.replaceChild(render(next),node);

275 return true;

276 }

277 break;

278 case "Flow":

279 var arr = fromList(nextE._1);

280 for (var i = arr.length; i--; ) { arr[i] = arr[i].element.ctor; }

281 if (nextE._0.ctor !== currE._0.ctor) {

282 node.parentNode.replaceChild(render(next),node);

283 return true;

284 }

285 var nexts = fromList(nextE._1);

286 var kids = node.childNodes;

287 if (nexts.length !== kids.length) {

288 node.parentNode.replaceChild(render(next),node);

289 return true;

290 }

291 var currs = fromList(currE._1);

292 var goDir = function(x) { return x; };

293 switch(nextE._0.ctor) {

294 case "DDown": case "DUp": goDir = goDown; break;

295 case "DRight": case "DLeft": goDir = goRight; break;

296 case "DOut": case "DIn": goDir = goIn; break;

297 }

298 for (var i = kids.length; i-- ;) {

299 update(kids[i],currs[i],nexts[i]);

300 goDir(kids[i]);

301 }

302 break;

303 case "Container":

304 update(node.firstChild, currE._1, nextE._1);

305 setPos(nextE._0, nextE._1.props.width, nextE._1.props.height, node.firstChild);

306 break;

307 case "Custom":

308 if (currE.type === nextE.type) {

309 var done = nextE.update(node, currE.model, nextE.model);

310 if (done) return;

311 } else {

312 return node.parentNode.replaceChild(render(next), node);

313 }

314 }

315 updateProps(node, curr, next);

318function updateProps(node, curr, next) {

319 var props = next.props;

320 var currP = curr.props;

321 var e = node;

322 var element = next.element;

323 if (element.adjustWidth) {

324 props.width -= element.adjustWidth;

325 }

326 if (element.adjustHeight) {

327 props.height -= element.adjustHeight;

328 }

329 if (props.width !== currP.width) e.style.width = (props.width |0) + 'px';

330 if (props.height !== currP.height) e.style.height = (props.height|0) + 'px';

331 if (props.opacity !== 1 && props.opacity !== currP.opacity) {

332 e.style.opacity = props.opacity;

333 }

334 var nextColor = (props.color.ctor === 'Just' ?

335 extract(props.color._0) : '');

336 if (e.style.backgroundColor !== nextColor) {

337 e.style.backgroundColor = (nextColor === '' ? 'transparent' : nextColor);

338 }

339 if (props.tag !== currP.tag) { e.id = props.tag; }

340 if (props.href !== currP.href) {

341 if (currP.href === '') {

342 var a = newElement('a');

343 a.href = props.href;

344 a.style.width = '100%';

345 a.style.height = '100%';

346 a.style.top = 0;

347 a.style.left = 0;

348 a.style.display = 'block';

349 a.style.position = 'absolute';

350 e.style.position = 'relative';

351 e.appendChild(a);

352 } else {

353 node.lastNode.href = props.href;

354 }

355 }

357 // update hover handlers

358 if (props.hover.ctor !== '_Tuple0') {

359 e.elm_hover_handler = props.hover;

360 } else if (e.elm_hover_handler) {

361 e.elm_hover_handler = null;

362 }

364 // update click handlers

365 if (props.click.ctor !== '_Tuple0') {

366 e.elm_click_handler = props.click;

367 } else if (e.elm_click_handler) {

368 e.elm_click_handler = null;

369 }

372return { render:render, update:update };