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 var width = props.width - (element.adjustWidth || 0);

14 var height = props.height - (element.adjustHeight || 0);

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

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

17 if (props.opacity !== 1) {

18 e.style.opacity = props.opacity;

19 }

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

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

22 }

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

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

25 var a = newElement('a');

26 a.href = props.href;

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

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

29 a.style.top = 0;

30 a.style.left = 0;

31 a.style.display = 'block';

32 a.style.position = 'absolute';

33 e.style.position = 'relative';

34 a.style.pointerEvents = 'auto';

35 e.appendChild(a);

36 }

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

38 addHover(e, props.hover);

39 }

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

41 addClick(e, props.click);

42 }

43 return e;

46function addClick(e, handler) {

47 e.style.pointerEvents = 'auto';

48 e.elm_click_handler = handler;

49 function trigger(ev) {

50 e.elm_click_handler(Utils.Tuple0);

51 ev.stopPropagation();

52 }

53 e.elm_click_trigger = trigger;

54 e.addEventListener('click', trigger);

57function removeClick(e, handler) {

58 if (e.elm_click_trigger) {

59 e.removeEventListener('click', e.elm_click_trigger);

60 }

63function addHover(e, handler) {

64 e.style.pointerEvents = 'auto';

65 e.elm_hover_handler = handler;

66 e.elm_hover_count = 0;

68 function over(evt) {

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

70 e.elm_hover_handler(true);

71 evt.stopPropagation();

72 }

73 function out(evt) {

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

75 e.elm_hover_count = 0;

76 e.elm_hover_handler(false);

77 evt.stopPropagation();

78 }

79 e.elm_hover_over = over;

80 e.elm_hover_out = out;

81 e.addEventListener('mouseover', over);

82 e.addEventListener('mouseout', out);

85function removeHover(e) {

86 if (e.elm_hover_over) {

87 e.removeEventListener('mouseover', e.elm_hover_over);

88 }

89 if (e.elm_hover_out) {

90 e.removeEventListener('mouseout', e.elm_hover_out);

91 }

94function image(props, img) {

95 switch (img._0.ctor) {

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

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

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

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

100 }

103function plainImage(src) {

104 var img = newElement('img');

105 img.src = src;

106 img.name = src;

107 img.style.display = "block";

108 return img;

111function tiledImage(src) {

112 var div = newElement('div');

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

114 return div;

117function fittedImage(w, h, src) {

118 var div = newElement('div');

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

120 div.style.webkitBackgroundSize = 'cover';

121 div.style.MozBackgroundSize = 'cover';

122 div.style.OBackgroundSize = 'cover';

123 div.style.backgroundSize = 'cover';

124 return div;

127function croppedImage(elem, w, h, src) {

128 var pos = elem._0._0;

129 var e = newElement('div');

130 e.style.overflow = "hidden";

132 var img = newElement('img');

133 img.onload = function() {

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

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

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

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

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

139 };

140 img.src = src;

141 img.name = src;

142 e.appendChild(img);

143 return e;

146function goIn(e) { e.style.position = 'absolute'; return e; }

147function goDown(e) { return e }

148function goRight(e) { e.style.styleFloat = e.style.cssFloat = "left"; return e; }

149function flowWith(f, array) {

150 var container = newElement('div');

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

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

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

155 }

156 return container;

159function flow(dir,elist) {

160 var array = fromList(elist);

161 switch(dir.ctor) {

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

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

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

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

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

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

168 }

171function toPos(pos) {

172 switch(pos.ctor) {

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

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

175 }

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

179// before calling this function

180function setPos(pos,elem,e) {

181 var element = elem.element;

182 var props = elem.props;

183 var w = props.width + (element.adjustWidth ? element.adjustWidth : 0);

184 var h = props.height + (element.adjustHeight ? element.adjustHeight : 0);

186 e.style.position = 'absolute';

187 e.style.margin = 'auto';

188 var transform = '';

189 switch(pos.horizontal.ctor) {

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

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

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

193 }

194 switch(pos.vertical.ctor) {

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

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

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

198 }

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

200 return e;

203function container(pos,elem) {

204 var e = render(elem);

205 setPos(pos, elem, e);

206 var div = newElement('div');

207 div.style.position = 'relative';

208 div.style.overflow = 'hidden';

209 div.appendChild(e);

210 return div;

213function rawHtml(elem) {

214 var html = elem.html;

215 var args = elem.args;

216 var guid = elem.guid;

217 var align = elem.align;

219 var div = newElement('div');

220 div.innerHTML = html;

221 div.style.visibility = "hidden";

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

223 document.body.appendChild(div);

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

226 var arg = args[i];

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

228 if (arg.isText) {

229 span.innerHTML = arg;

230 } else {

231 span.style.display = 'block';

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

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

234 span.appendChild(render(arg));

235 }

236 }

237 document.body.removeChild(div);

238 div.style.visibility = 'visible';

239 div.style.pointerEvents = 'auto';

240 return div;

243function render(elem) { return setProps(elem, makeElement(elem)); }

244function makeElement(e) {

245 var elem = e.element;

246 switch(elem.ctor) {

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

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

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

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

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

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

253 }

256function update(node, curr, next) {

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

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

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

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

261 return true;

262 }

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

264 switch(nextE.ctor) {

265 case "Spacer": break;

266 case "RawHtml":

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

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

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

270 node.innerHTML = nextE.html;

271 }

272 break;

273 }

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

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

276 return true;

277 }

278 var nargs = nextE.args;

279 var cargs = currE.args;

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

281 var narg = nargs[i];

282 var carg = cargs[i]

283 if (narg == carg) continue;

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

285 if (narg.isElement) {

286 if (carg.isElement) {

287 update(span, carg, narg);

288 } else {

289 span.style.display = 'block';

290 var e = render(narg);

291 span.innerHTML = '';

292 span.appendChild(e);

293 }

294 } else {

295 span.style.display = 'inline';

296 span.innerHTML = narg;

297 }

298 }

299 break;

300 case "Image":

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

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

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

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

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

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

307 return true;

308 }

309 break;

310 case "Flow":

311 var arr = fromList(nextE._1);

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

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

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

315 return true;

316 }

317 var nexts = fromList(nextE._1);

318 var kids = node.childNodes;

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

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

321 return true;

322 }

323 var currs = fromList(currE._1);

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

325 switch(nextE._0.ctor) {

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

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

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

329 }

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

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

332 goDir(kids[i]);

333 }

334 break;

335 case "Container":

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

337 setPos(nextE._0, nextE._1, node.firstChild);

338 break;

339 case "Custom":

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

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

342 if (done) return;

343 } else {

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

345 }

346 }

347 updateProps(node, curr, next);

350function updateProps(node, curr, next) {

351 var props = next.props;

352 var currP = curr.props;

353 var e = node;

354 var element = next.element;

355 var width = props.width - (element.adjustWidth || 0);

356 var height = props.height - (element.adjustHeight || 0);

357 if (width !== currP.width) {

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

359 }

360 if (height !== currP.height) {

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

362 }

363 if (props.opacity !== currP.opacity) {

364 e.style.opacity = props.opacity;

365 }

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

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

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

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

370 }

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

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

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

374 var a = newElement('a');

375 a.href = props.href;

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

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

378 a.style.top = 0;

379 a.style.left = 0;

380 a.style.display = 'block';

381 a.style.position = 'absolute';

382 e.style.position = 'relative';

383 a.style.pointerEvents = 'auto';

384 e.appendChild(a);

385 } else {

386 node.lastNode.href = props.href;

387 }

388 }

390 // update hover handlers

391 if (props.hover.ctor === '_Tuple0') {

392 removeHover(e);

393 } else if (e.elm_hover_handler) {

394 e.elm_hover_handler = props.hover;

395 } else {

396 addHover(e, props.hover);

397 }

399 // update click handlers

400 if (props.click.ctor === '_Tuple0') {

401 removeClick(e);

402 } else if (e.elm_click_handler) {

403 e.elm_click_handler = props.click;

404 } else {

405 addClick(e, props.click);

406 }

409return { render:render, update:update };