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 e.appendChild(a);

35 }

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

37 addHover(e, props.hover);

38 }

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

40 addClick(e, props.click);

41 }

42 return e;

45function addClick(e, handler) {

46 e.style.pointerEvents = 'auto';

47 e.elm_click_handler = handler;

48 function trigger(ev) {

49 e.elm_click_handler(Utils.Tuple0);

50 ev.stopPropagation();

51 }

52 e.elm_click_trigger = trigger;

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

56function removeClick(e, handler) {

57 if (e.elm_click_trigger) {

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

59 }

62function addHover(e, handler) {

63 e.style.pointerEvents = 'auto';

64 e.elm_hover_handler = handler;

65 e.elm_hover_count = 0;

67 function over() {

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

69 e.elm_hover_handler(true);

70 }

71 function out(evt) {

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

73 e.elm_hover_count = 0;

74 e.elm_hover_handler(false);

75 }

76 e.elm_hover_over = over;

77 e.elm_hover_out = out;

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

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

82function removeHover(e) {

83 if (e.elm_hover_over) {

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

85 }

86 if (e.elm_hover_out) {

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

88 }

91function image(props, img) {

92 switch (img._0.ctor) {

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

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

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

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

97 }

100function plainImage(src) {

101 var img = newElement('img');

102 img.src = src;

103 img.name = src;

104 img.style.display = "block";

105 return img;

108function tiledImage(src) {

109 var div = newElement('div');

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

111 return div;

114function fittedImage(w, h, src) {

115 var div = newElement('div');

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

117 div.style.webkitBackgroundSize = 'cover';

118 div.style.MozBackgroundSize = 'cover';

119 div.style.OBackgroundSize = 'cover';

120 div.style.backgroundSize = 'cover';

121 return div;

124function croppedImage(elem, w, h, src) {

125 var pos = elem._0._0;

126 var e = newElement('div');

127 e.style.overflow = "hidden";

129 var img = newElement('img');

130 img.onload = function() {

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

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

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

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

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

136 };

137 img.src = src;

138 img.name = src;

139 e.appendChild(img);

140 return e;

143function goIn(e) { e.style.position = 'absolute'; return e; }

144function goDown(e) { return e }

145function goRight(e) { e.style.styleFloat = e.style.cssFloat = "left"; return e; }

146function flowWith(f, array) {

147 var container = newElement('div');

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

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

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

152 }

153 return container;

156function flow(dir,elist) {

157 var array = fromList(elist);

158 switch(dir.ctor) {

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

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

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

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

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

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

165 }

168function toPos(pos) {

169 switch(pos.ctor) {

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

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

172 }

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

176// before calling this function

177function setPos(pos,elem,e) {

178 var element = elem.element;

179 var props = elem.props;

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

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

183 e.style.position = 'absolute';

184 e.style.margin = 'auto';

185 var transform = '';

186 switch(pos.horizontal.ctor) {

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

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

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

190 }

191 switch(pos.vertical.ctor) {

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

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

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

195 }

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

197 return e;

200function container(pos,elem) {

201 var e = render(elem);

202 setPos(pos, elem, e);

203 var div = newElement('div');

204 div.style.position = 'relative';

205 div.style.overflow = 'hidden';

206 div.appendChild(e);

207 return div;

210function rawHtml(elem) {

211 var html = elem.html;

212 var args = elem.args;

213 var guid = elem.guid;

214 var align = elem.align;

216 var div = newElement('div');

217 div.innerHTML = html;

218 div.style.visibility = "hidden";

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

220 document.body.appendChild(div);

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

223 var arg = args[i];

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

225 if (arg.isText) {

226 span.innerHTML = arg;

227 } else {

228 span.style.display = 'block';

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

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

231 span.appendChild(render(arg));

232 }

233 }

234 document.body.removeChild(div);

235 div.style.visibility = 'visible';

236 return div;

239function render(elem) { return setProps(elem, makeElement(elem)); }

240function makeElement(e) {

241 var elem = e.element;

242 switch(elem.ctor) {

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

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

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

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

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

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

249 }

252function update(node, curr, next) {

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

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

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

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

257 return true;

258 }

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

260 switch(nextE.ctor) {

261 case "Spacer": break;

262 case "RawHtml":

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

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

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

266 node.innerHTML = nextE.html;

267 }

268 break;

269 }

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

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

272 return true;

273 }

274 var nargs = nextE.args;

275 var cargs = currE.args;

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

277 var narg = nargs[i];

278 var carg = cargs[i]

279 if (narg == carg) continue;

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

281 if (narg.isElement) {

282 if (carg.isElement) {

283 update(span, carg, narg);

284 } else {

285 span.style.display = 'block';

286 var e = render(narg);

287 span.innerHTML = '';

288 span.appendChild(e);

289 }

290 } else {

291 span.style.display = 'inline';

292 span.innerHTML = narg;

293 }

294 }

295 break;

296 case "Image":

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

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

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

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

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

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

303 return true;

304 }

305 break;

306 case "Flow":

307 var arr = fromList(nextE._1);

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

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

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

311 return true;

312 }

313 var nexts = fromList(nextE._1);

314 var kids = node.childNodes;

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

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

317 return true;

318 }

319 var currs = fromList(currE._1);

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

321 switch(nextE._0.ctor) {

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

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

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

325 }

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

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

328 goDir(kids[i]);

329 }

330 break;

331 case "Container":

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

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

334 break;

335 case "Custom":

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

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

338 if (done) return;

339 } else {

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

341 }

342 }

343 updateProps(node, curr, next);

346function updateProps(node, curr, next) {

347 var props = next.props;

348 var currP = curr.props;

349 var e = node;

350 var element = next.element;

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

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

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

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

355 }

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

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

358 }

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

360 e.style.opacity = props.opacity;

361 }

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

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

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

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

366 }

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

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

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

370 var a = newElement('a');

371 a.href = props.href;

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

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

374 a.style.top = 0;

375 a.style.left = 0;

376 a.style.display = 'block';

377 a.style.position = 'absolute';

378 e.style.position = 'relative';

379 e.appendChild(a);

380 } else {

381 node.lastNode.href = props.href;

382 }

383 }

385 // update hover handlers

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

387 removeHover(e);

388 } else if (e.elm_hover_handler) {

389 e.elm_hover_handler = props.hover;

390 } else {

391 addHover(e, props.hover);

392 }

394 // update click handlers

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

396 removeClick(e);

397 } else if (e.elm_click_handler) {

398 e.elm_click_handler = props.click;

399 } else {

400 addClick(e, props.click);

401 }

404return { render:render, update:update };