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Side by Side Diff: pkg/template_binding/lib/src/template_iterator.dart

Issue 507653004: update polymer to 0.3.5 (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: code review updates Created 6 years, 3 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 part of template_binding; 5 part of template_binding;
6 6
7 // This code is a port of what was formerly known as Model-Driven-Views, now 7 // This code is a port of what was formerly known as Model-Driven-Views, now
8 // located at: 8 // located at:
9 // https://github.com/polymer/TemplateBinding 9 // https://github.com/polymer/TemplateBinding
10 // https://github.com/polymer/NodeBind 10 // https://github.com/polymer/NodeBind
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250 } 250 }
251 251
252 void _updateDependencies(_TemplateBindingMap directives, model) { 252 void _updateDependencies(_TemplateBindingMap directives, model) {
253 _closeDependencies(); 253 _closeDependencies();
254 254
255 final template = _templateElement; 255 final template = _templateElement;
256 256
257 _hasIf = directives._if != null; 257 _hasIf = directives._if != null;
258 _hasRepeat = directives._repeat != null; 258 _hasRepeat = directives._repeat != null;
259 259
260 var ifValue = true;
260 if (_hasIf) { 261 if (_hasIf) {
261 _ifOneTime = directives._if.onlyOneTime; 262 _ifOneTime = directives._if.onlyOneTime;
262 _ifValue = _processBinding('if', directives._if, template, model); 263 _ifValue = _processBinding('if', directives._if, template, model);
264 ifValue = _ifValue;
263 265
264 // oneTime if & predicate is false. nothing else to do. 266 // oneTime if & predicate is false. nothing else to do.
265 if (_ifOneTime) { 267 if (_ifOneTime && !_toBoolean(ifValue)) {
266 if (!_toBoolean(_ifValue)) { 268 _valueChanged(null);
267 _updateIteratedValue(null); 269 return;
268 return; 270 }
269 } 271
270 } else { 272 if (!_ifOneTime) {
271 (_ifValue as Bindable).open(_updateIteratedValue); 273 ifValue = (ifValue as Bindable).open(_updateIfValue);
272 } 274 }
273 } 275 }
274 276
275 if (_hasRepeat) { 277 if (_hasRepeat) {
276 _oneTime = directives._repeat.onlyOneTime; 278 _oneTime = directives._repeat.onlyOneTime;
277 _value = _processBinding('repeat', directives._repeat, template, model); 279 _value = _processBinding('repeat', directives._repeat, template, model);
278 } else { 280 } else {
279 _oneTime = directives._bind.onlyOneTime; 281 _oneTime = directives._bind.onlyOneTime;
280 _value = _processBinding('bind', directives._bind, template, model); 282 _value = _processBinding('bind', directives._bind, template, model);
281 } 283 }
282 284
283 if (!_oneTime) _value.open(_updateIteratedValue); 285 var value = _value;
286 if (!_oneTime) {
287 value = _value.open(_updateIteratedValue);
288 }
284 289
285 _updateIteratedValue(null); 290 if (!_toBoolean(ifValue)) {
291 _valueChanged(null);
292 return;
293 }
294
295 _updateValue(value);
286 } 296 }
287 297
288 void _updateIteratedValue(_) { 298 /// Gets the updated value of the bind/repeat. This can potentially call
299 /// user code (if a bindingDelegate is set up) so we try to avoid it if we
300 /// already have the value in hand (from Observer.open).
301 Object _getUpdatedValue() {
302 var value = _value;
303 // Dart note: x.discardChanges() is x.value in Dart.
304 if (!_toBoolean(_oneTime)) value = value.value;
305 return value;
306 }
307
308 void _updateIfValue(ifValue) {
309 if (!_toBoolean(ifValue)) {
310 _valueChanged(null);
311 return;
312 }
313 _updateValue(_getUpdatedValue());
314 }
315
316 void _updateIteratedValue(value) {
289 if (_hasIf) { 317 if (_hasIf) {
290 var ifValue = _ifValue; 318 var ifValue = _ifValue;
291 if (!_ifOneTime) ifValue = (ifValue as Bindable).value; 319 if (!_ifOneTime) ifValue = (ifValue as Bindable).value;
292 if (!_toBoolean(ifValue)) { 320 if (!_toBoolean(ifValue)) {
293 _valueChanged([]); 321 _valueChanged([]);
294 return; 322 return;
295 } 323 }
296 } 324 }
297 325
298 var value = _value; 326 _updateValue(value);
299 if (!_oneTime) value = (value as Bindable).value; 327 }
328
329 void _updateValue(Object value) {
300 if (!_hasRepeat) value = [value]; 330 if (!_hasRepeat) value = [value];
301 _valueChanged(value); 331 _valueChanged(value);
302 } 332 }
303 333
304 void _valueChanged(Object value) { 334 void _valueChanged(Object value) {
305 if (value is! List) { 335 if (value is! List) {
306 if (value is Iterable) { 336 if (value is Iterable) {
307 // Dart note: we support Iterable by calling toList. 337 // Dart note: we support Iterable by calling toList.
308 // But we need to be careful to observe the original iterator if it 338 // But we need to be careful to observe the original iterator if it
309 // supports that. 339 // supports that.
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517 _closed = true; 547 _closed = true;
518 } 548 }
519 } 549 }
520 550
521 // Dart note: the JavaScript version just puts an expando on the array. 551 // Dart note: the JavaScript version just puts an expando on the array.
522 class _BoundNodes { 552 class _BoundNodes {
523 final List<Node> nodes; 553 final List<Node> nodes;
524 final List<Bindable> instanceBindings; 554 final List<Bindable> instanceBindings;
525 _BoundNodes(this.nodes, this.instanceBindings); 555 _BoundNodes(this.nodes, this.instanceBindings);
526 } 556 }
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