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(props, e) {

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

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

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

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

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

16 }

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

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

19 var a = newElement('a');

20 a.href = props.href;

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

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

23 a.style.top = 0;

24 a.style.left = 0;

25 a.style.display = 'block';

26 a.style.position = 'absolute';

27 e.style.position = 'relative';

28 e.appendChild(a);

29 }

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

31 e.elm_hover_handler = props.hover;

32 e.elm_hover_count = 0;

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

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

35 var handler = e.elm_hover_handler;

36 if (handler !== null) {

37 handler(true);

38 }

39 });

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

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

42 e.elm_hover_count = 0;

43 var handler = e.elm_hover_handler;

44 if (handler !== null) {

45 handler(false);

46 }

47 });

48 }

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

50 e.elm_click_handler = props.click;

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

52 e.elm_click_handler(Tuple0);

53 });

54 }

55 return e;

58function image(props, img) {

59 switch (img._0.ctor) {

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

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

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

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

64 }

67function plainImage(src) {

68 var img = newElement('img');

69 img.src = src;

70 img.name = src;

71 img.style.display = "block";

72 return img;

75function tiledImage(src) {

76 var div = newElement('div');

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

78 return div;

81function fittedImage(w, h, src) {

82 var div = newElement('div');

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

84 div.style.webkitBackgroundSize = 'cover';

85 div.style.MozBackgroundSize = 'cover';

86 div.style.OBackgroundSize = 'cover';

87 div.style.backgroundSize = 'cover';

88 return div;

91function croppedImage(elem, w, h, src) {

92 var pos = elem._0._0;

93 var e = newElement('div');

94 e.style.overflow = "hidden";

96 var img = newElement('img');

97 img.onload = function() {

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

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

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

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

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

103 };

104 img.src = src;

105 img.name = src;

106 e.appendChild(img);

107 return e;

110function goIn(e) { e.style.position = 'absolute'; return e; }

111function goDown(e) { return e }

112function goRight(e) { e.style.styleFloat = e.style.cssFloat = "left"; return e; }

113function flowWith(f, array) {

114 var container = newElement('div');

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

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

117 }

118 return container;

121function flow(dir,elist) {

122 var array = fromList(elist);

123 switch(dir.ctor) {

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

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

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

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

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

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

130 }

133function toPos(pos) {

134 switch(pos.ctor) {

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

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

137 }

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

141// before calling this function

142function setPos(pos,w,h,e) {

143 e.style.position = 'absolute';

144 e.style.margin = 'auto';

145 var transform = '';

146 switch(pos.horizontal.ctor) {

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

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

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

150 }

151 switch(pos.vertical.ctor) {

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

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

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

155 }

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

157 return e;

160function container(pos,elem) {

161 var e = render(elem);

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

163 var div = newElement('div');

164 div.style.position = 'relative';

165 div.style.overflow = 'hidden';

166 div.appendChild(e);

167 return div;

170function rawHtml(elem) {

171 var html = elem.html;

172 var args = elem.args;

173 var guid = elem.guid;

174 var align = elem.align;

176 var div = newElement('div');

177 div.innerHTML = html;

178 div.style.visibility = "hidden";

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

180 document.body.appendChild(div);

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

183 var arg = args[i];

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

185 if (arg.isText) {

186 span.innerHTML = arg;

187 } else {

188 span.style.display = 'block';

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

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

191 span.appendChild(render(arg));

192 }

193 }

194 document.body.removeChild(div);

195 div.style.visibility = 'visible';

196 return div;

199function render(elem) { return setProps(elem.props, makeElement(elem)); }

200function makeElement(e) {

201 var elem = e.element;

202 switch(elem.ctor) {

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

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

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

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

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

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

209 }

212function update(node, curr, next) {

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

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

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

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

217 return true;

218 }

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

220 switch(nextE.ctor) {

221 case "Spacer": break;

222 case "RawHtml":

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

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

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

226 node.innerHTML = nextE.html;

227 }

228 break;

229 }

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

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

232 return true;

233 }

234 var nargs = nextE.args;

235 var cargs = currE.args;

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

237 var narg = nargs[i];

238 var carg = cargs[i]

239 if (narg == carg) continue;

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

241 if (narg.isElement) {

242 if (carg.isElement) {

243 update(span, carg, narg);

244 } else {

245 span.style.display = 'block';

246 var e = render(narg);

247 span.innerHTML = '';

248 span.appendChild(e);

249 }

250 } else {

251 span.style.display = 'inline';

252 span.innerHTML = narg;

253 }

254 }

255 break;

256 case "Image":

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

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

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

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

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

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

263 return true;

264 }

265 break;

266 case "Flow":

267 var arr = fromList(nextE._1);

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

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

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

271 return true;

272 }

273 var nexts = fromList(nextE._1);

274 var kids = node.childNodes;

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

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

277 return true;

278 }

279 var currs = fromList(currE._1);

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

281 switch(nextE._0.ctor) {

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

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

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

285 }

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

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

288 goDir(kids[i]);

289 }

290 break;

291 case "Container":

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

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

294 break;

295 case "Custom":

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

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

298 if (done) return;

299 } else {

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

301 }

302 }

303 updateProps(node, curr, next);

306function updateProps(node, curr, next) {

307 var props = next.props, currP = curr.props, e = node;

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

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

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

311 e.style.opacity = props.opacity;

312 }

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

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

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

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

317 }

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

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

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

321 var a = newElement('a');

322 a.href = props.href;

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

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

325 a.style.top = 0;

326 a.style.left = 0;

327 a.style.display = 'block';

328 a.style.position = 'absolute';

329 e.style.position = 'relative';

330 e.appendChild(a);

331 } else {

332 node.lastNode.href = props.href;

333 }

334 }

336 // update hover handlers

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

338 e.elm_hover_handler = props.hover;

339 } else if (e.elm_hover_handler) {

340 e.elm_hover_handler = null;

341 }

343 // update click handlers

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

345 e.elm_click_handler = props.click;

346 } else if (e.elm_click_handler) {

347 e.elm_click_handler = null;

348 }

351return { render:render, update:update };