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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 library fn; | |
| 6 | |
| 7 import 'dart:async'; | |
| 8 import 'dart:collection'; | |
| 9 import 'dart:sky' as sky; | |
| 10 import 'reflect.dart' as reflect; | |
| 11 import 'layout.dart'; | |
| 12 | |
| 13 export 'layout.dart' show Style; | |
| 14 | |
| 15 final sky.Tracing _tracing = sky.window.tracing; | |
| 16 | |
| 17 final bool _shouldLogRenderDuration = false; | |
| 18 final bool _shouldTrace = false; | |
| 19 | |
| 20 enum _SyncOperation { IDENTICAL, INSERTION, STATEFUL, STATELESS, REMOVAL } | |
| 21 | |
| 22 /* | |
| 23 * All Effen nodes derive from UINode. All nodes have a _parent, a _key and | |
| 24 * can be sync'd. | |
| 25 */ | |
| 26 abstract class UINode { | |
| 27 String _key; | |
| 28 UINode _parent; | |
| 29 UINode get parent => _parent; | |
| 30 RenderCSS _root; | |
| 31 bool _defunct = false; | |
| 32 | |
| 33 UINode({ Object key }) { | |
| 34 _key = key == null ? "$runtimeType" : "$runtimeType-$key"; | |
| 35 } | |
| 36 | |
| 37 // Subclasses which implements Nodes that become stateful may return true | |
| 38 // if the |old| node has become stateful and should be retained. | |
| 39 bool _willSync(UINode old) => false; | |
| 40 | |
| 41 bool get interchangeable => false; // if true, then keys can be duplicated | |
| 42 | |
| 43 void _sync(UINode old, RenderCSSContainer host, RenderCSS insertBefore); | |
| 44 | |
| 45 void _remove() { | |
| 46 _defunct = true; | |
| 47 _root = null; | |
| 48 handleRemoved(); | |
| 49 } | |
| 50 void handleRemoved() { } | |
| 51 | |
| 52 int _nodeDepth; | |
| 53 void _ensureDepth() { | |
| 54 if (_nodeDepth == null) { | |
| 55 if (_parent != null) { | |
| 56 _parent._ensureDepth(); | |
| 57 _nodeDepth = _parent._nodeDepth + 1; | |
| 58 } else { | |
| 59 _nodeDepth = 0; | |
| 60 } | |
| 61 } | |
| 62 } | |
| 63 | |
| 64 void _trace(String message) { | |
| 65 if (!_shouldTrace) | |
| 66 return; | |
| 67 | |
| 68 _ensureDepth(); | |
| 69 print((' ' * _nodeDepth) + message); | |
| 70 } | |
| 71 | |
| 72 void _traceSync(_SyncOperation op, String key) { | |
| 73 if (!_shouldTrace) | |
| 74 return; | |
| 75 | |
| 76 String opString = op.toString().toLowerCase(); | |
| 77 String outString = opString.substring(opString.indexOf('.') + 1); | |
| 78 _trace('_sync($outString) $key'); | |
| 79 } | |
| 80 | |
| 81 void _removeChild(UINode node) { | |
| 82 _traceSync(_SyncOperation.REMOVAL, node._key); | |
| 83 node._remove(); | |
| 84 } | |
| 85 | |
| 86 // Returns the child which should be retained as the child of this node. | |
| 87 UINode _syncChild(UINode node, UINode oldNode, RenderCSSContainer host, | |
| 88 RenderCSS insertBefore) { | |
| 89 | |
| 90 assert(oldNode == null || node._key == oldNode._key); | |
| 91 | |
| 92 if (node == oldNode) { | |
| 93 _traceSync(_SyncOperation.IDENTICAL, node._key); | |
| 94 return node; // Nothing to do. Subtrees must be identical. | |
| 95 } | |
| 96 | |
| 97 // TODO(rafaelw): This eagerly removes the old DOM. It may be that a | |
| 98 // new component was built that could re-use some of it. Consider | |
| 99 // syncing the new VDOM against the old one. | |
| 100 if (oldNode != null && node._key != oldNode._key) { | |
| 101 _removeChild(oldNode); | |
| 102 } | |
| 103 | |
| 104 if (node._willSync(oldNode)) { | |
| 105 _traceSync(_SyncOperation.STATEFUL, node._key); | |
| 106 oldNode._sync(node, host, insertBefore); | |
| 107 node._defunct = true; | |
| 108 assert(oldNode._root is RenderCSS); | |
| 109 return oldNode; | |
| 110 } | |
| 111 | |
| 112 node._parent = this; | |
| 113 | |
| 114 if (oldNode == null) { | |
| 115 _traceSync(_SyncOperation.INSERTION, node._key); | |
| 116 } else { | |
| 117 _traceSync(_SyncOperation.STATELESS, node._key); | |
| 118 } | |
| 119 node._sync(oldNode, host, insertBefore); | |
| 120 if (oldNode != null) | |
| 121 oldNode._defunct = true; | |
| 122 | |
| 123 assert(node._root is RenderCSS); | |
| 124 return node; | |
| 125 } | |
| 126 } | |
| 127 | |
| 128 abstract class ContentNode extends UINode { | |
| 129 UINode content; | |
| 130 | |
| 131 ContentNode(UINode content) : this.content = content, super(key: content._key)
; | |
| 132 | |
| 133 void _sync(UINode old, RenderCSSContainer host, RenderCSS insertBefore) { | |
| 134 UINode oldContent = old == null ? null : (old as ContentNode).content; | |
| 135 content = _syncChild(content, oldContent, host, insertBefore); | |
| 136 assert(content._root != null); | |
| 137 _root = content._root; | |
| 138 } | |
| 139 | |
| 140 void _remove() { | |
| 141 if (content != null) | |
| 142 _removeChild(content); | |
| 143 super._remove(); | |
| 144 } | |
| 145 } | |
| 146 | |
| 147 class StyleNode extends ContentNode { | |
| 148 final Style style; | |
| 149 | |
| 150 StyleNode(UINode content, this.style): super(content); | |
| 151 } | |
| 152 | |
| 153 class ParentDataNode extends ContentNode { | |
| 154 final ParentData parentData; | |
| 155 | |
| 156 ParentDataNode(UINode content, this.parentData): super(content); | |
| 157 } | |
| 158 | |
| 159 /* | |
| 160 * SkyNodeWrappers correspond to a desired state of a RenderCSS. They are fully | |
| 161 * immutable, with one exception: A UINode which is a Component which lives with
in | |
| 162 * an SkyElementWrapper's children list, may be replaced with the "old" instance
if it | |
| 163 * has become stateful. | |
| 164 */ | |
| 165 abstract class SkyNodeWrapper extends UINode { | |
| 166 | |
| 167 static final Map<RenderCSS, SkyNodeWrapper> _nodeMap = | |
| 168 new HashMap<RenderCSS, SkyNodeWrapper>(); | |
| 169 | |
| 170 static SkyNodeWrapper _getMounted(RenderCSS node) => _nodeMap[node]; | |
| 171 | |
| 172 SkyNodeWrapper({ Object key }) : super(key: key); | |
| 173 | |
| 174 SkyNodeWrapper get _emptyNode; | |
| 175 | |
| 176 RenderCSS _createNode(); | |
| 177 | |
| 178 void _sync(UINode old, RenderCSSContainer host, RenderCSS insertBefore) { | |
| 179 if (old == null) { | |
| 180 _root = _createNode(); | |
| 181 assert(_root != null); | |
| 182 host.add(_root, before: insertBefore); | |
| 183 old = _emptyNode; | |
| 184 } else { | |
| 185 _root = old._root; | |
| 186 assert(_root != null); | |
| 187 } | |
| 188 | |
| 189 _nodeMap[_root] = this; | |
| 190 _syncNode(old); | |
| 191 } | |
| 192 | |
| 193 void _syncNode(SkyNodeWrapper old); | |
| 194 | |
| 195 void _removeChild(UINode node) { | |
| 196 assert(_root is RenderCSSContainer); | |
| 197 _root.remove(node._root); | |
| 198 super._removeChild(node); | |
| 199 } | |
| 200 | |
| 201 void _remove() { | |
| 202 assert(_root != null); | |
| 203 _nodeMap.remove(_root); | |
| 204 super._remove(); | |
| 205 } | |
| 206 } | |
| 207 | |
| 208 typedef GestureEventListener(sky.GestureEvent e); | |
| 209 typedef PointerEventListener(sky.PointerEvent e); | |
| 210 typedef EventListener(sky.Event e); | |
| 211 | |
| 212 class EventListenerNode extends ContentNode { | |
| 213 final Map<String, sky.EventListener> listeners; | |
| 214 | |
| 215 static final Set<String> _registeredEvents = new HashSet<String>(); | |
| 216 | |
| 217 static Map<String, sky.EventListener> _createListeners({ | |
| 218 EventListener onWheel, | |
| 219 GestureEventListener onGestureFlingCancel, | |
| 220 GestureEventListener onGestureFlingStart, | |
| 221 GestureEventListener onGestureScrollStart, | |
| 222 GestureEventListener onGestureScrollUpdate, | |
| 223 GestureEventListener onGestureTap, | |
| 224 GestureEventListener onGestureTapDown, | |
| 225 PointerEventListener onPointerCancel, | |
| 226 PointerEventListener onPointerDown, | |
| 227 PointerEventListener onPointerMove, | |
| 228 PointerEventListener onPointerUp, | |
| 229 Map<String, sky.EventListener> custom | |
| 230 }) { | |
| 231 var listeners = custom != null ? | |
| 232 new HashMap<String, sky.EventListener>.from(custom) : | |
| 233 new HashMap<String, sky.EventListener>(); | |
| 234 | |
| 235 if (onWheel != null) | |
| 236 listeners['wheel'] = onWheel; | |
| 237 if (onGestureFlingCancel != null) | |
| 238 listeners['gestureflingcancel'] = onGestureFlingCancel; | |
| 239 if (onGestureFlingStart != null) | |
| 240 listeners['gestureflingstart'] = onGestureFlingStart; | |
| 241 if (onGestureScrollStart != null) | |
| 242 listeners['gesturescrollstart'] = onGestureScrollStart; | |
| 243 if (onGestureScrollUpdate != null) | |
| 244 listeners['gesturescrollupdate'] = onGestureScrollUpdate; | |
| 245 if (onGestureTap != null) | |
| 246 listeners['gesturetap'] = onGestureTap; | |
| 247 if (onGestureTapDown != null) | |
| 248 listeners['gesturetapdown'] = onGestureTapDown; | |
| 249 if (onPointerCancel != null) | |
| 250 listeners['pointercancel'] = onPointerCancel; | |
| 251 if (onPointerDown != null) | |
| 252 listeners['pointerdown'] = onPointerDown; | |
| 253 if (onPointerMove != null) | |
| 254 listeners['pointermove'] = onPointerMove; | |
| 255 if (onPointerUp != null) | |
| 256 listeners['pointerup'] = onPointerUp; | |
| 257 | |
| 258 return listeners; | |
| 259 } | |
| 260 | |
| 261 EventListenerNode(UINode content, { | |
| 262 EventListener onWheel, | |
| 263 GestureEventListener onGestureFlingCancel, | |
| 264 GestureEventListener onGestureFlingStart, | |
| 265 GestureEventListener onGestureScrollStart, | |
| 266 GestureEventListener onGestureScrollUpdate, | |
| 267 GestureEventListener onGestureTap, | |
| 268 GestureEventListener onGestureTapDown, | |
| 269 PointerEventListener onPointerCancel, | |
| 270 PointerEventListener onPointerDown, | |
| 271 PointerEventListener onPointerMove, | |
| 272 PointerEventListener onPointerUp, | |
| 273 Map<String, sky.EventListener> custom | |
| 274 }) : listeners = _createListeners( | |
| 275 onWheel: onWheel, | |
| 276 onGestureFlingCancel: onGestureFlingCancel, | |
| 277 onGestureFlingStart: onGestureFlingStart, | |
| 278 onGestureScrollUpdate: onGestureScrollUpdate, | |
| 279 onGestureScrollStart: onGestureScrollStart, | |
| 280 onGestureTap: onGestureTap, | |
| 281 onGestureTapDown: onGestureTapDown, | |
| 282 onPointerCancel: onPointerCancel, | |
| 283 onPointerDown: onPointerDown, | |
| 284 onPointerMove: onPointerMove, | |
| 285 onPointerUp: onPointerUp, | |
| 286 custom: custom | |
| 287 ), | |
| 288 super(content); | |
| 289 | |
| 290 void _handleEvent(sky.Event e) { | |
| 291 sky.EventListener listener = listeners[e.type]; | |
| 292 if (listener != null) { | |
| 293 listener(e); | |
| 294 } | |
| 295 } | |
| 296 | |
| 297 static void _dispatchEvent(sky.Event e) { | |
| 298 UINode target = SkyNodeWrapper._getMounted(bridgeEventTargetToRenderNode(e.t
arget)); | |
| 299 | |
| 300 // TODO(rafaelw): StopPropagation? | |
| 301 while (target != null) { | |
| 302 if (target is EventListenerNode) { | |
| 303 target._handleEvent(e); | |
| 304 } | |
| 305 | |
| 306 target = target._parent; | |
| 307 } | |
| 308 } | |
| 309 | |
| 310 static void _ensureDocumentListener(String eventType) { | |
| 311 if (_registeredEvents.add(eventType)) { | |
| 312 sky.document.addEventListener(eventType, _dispatchEvent); | |
| 313 } | |
| 314 } | |
| 315 | |
| 316 void _sync(UINode old, RenderCSSContainer host, RenderCSS insertBefore) { | |
| 317 for (var type in listeners.keys) { | |
| 318 _ensureDocumentListener(type); | |
| 319 } | |
| 320 | |
| 321 super._sync(old, host, insertBefore); | |
| 322 } | |
| 323 } | |
| 324 | |
| 325 final List<UINode> _emptyList = new List<UINode>(); | |
| 326 | |
| 327 abstract class SkyElementWrapper extends SkyNodeWrapper { | |
| 328 | |
| 329 final List<UINode> children; | |
| 330 final Style style; | |
| 331 final String inlineStyle; | |
| 332 | |
| 333 SkyElementWrapper({ | |
| 334 Object key, | |
| 335 List<UINode> children, | |
| 336 this.style, | |
| 337 this.inlineStyle | |
| 338 }) : this.children = children == null ? _emptyList : children, | |
| 339 super(key: key) { | |
| 340 | |
| 341 assert(!_debugHasDuplicateIds()); | |
| 342 } | |
| 343 | |
| 344 void _remove() { | |
| 345 assert(children != null); | |
| 346 for (var child in children) { | |
| 347 assert(child != null); | |
| 348 _removeChild(child); | |
| 349 } | |
| 350 super._remove(); | |
| 351 } | |
| 352 | |
| 353 bool _debugHasDuplicateIds() { | |
| 354 var idSet = new HashSet<String>(); | |
| 355 for (var child in children) { | |
| 356 assert(child != null); | |
| 357 if (child.interchangeable) | |
| 358 continue; // when these nodes are reordered, we just reassign the data | |
| 359 | |
| 360 if (!idSet.add(child._key)) { | |
| 361 throw '''If multiple non-interchangeable nodes of the same type exist as
children | |
| 362 of another node, they must have unique keys. | |
| 363 Duplicate: "${child._key}"'''; | |
| 364 } | |
| 365 } | |
| 366 return false; | |
| 367 } | |
| 368 | |
| 369 void _syncNode(SkyNodeWrapper old) { | |
| 370 SkyElementWrapper oldSkyElementWrapper = old as SkyElementWrapper; | |
| 371 | |
| 372 List<Style> styles = new List<Style>(); | |
| 373 if (style != null) | |
| 374 styles.add(style); | |
| 375 ParentData parentData = null; | |
| 376 UINode parent = _parent; | |
| 377 while (parent != null && parent is! SkyNodeWrapper) { | |
| 378 if (parent is StyleNode && parent.style != null) | |
| 379 styles.add(parent.style); | |
| 380 else | |
| 381 if (parent is ParentDataNode && parent.parentData != null) { | |
| 382 if (parentData != null) | |
| 383 parentData.merge(parent.parentData); // this will throw if the types a
ren't the same | |
| 384 else | |
| 385 parentData = parent.parentData; | |
| 386 } | |
| 387 parent = parent._parent; | |
| 388 } | |
| 389 _root.updateStyles(styles); | |
| 390 if (parentData != null) { | |
| 391 assert(_root.parentData != null); | |
| 392 _root.parentData.merge(parentData); // this will throw if the types aren't
approriate | |
| 393 assert(parent != null); | |
| 394 assert(parent._root != null); | |
| 395 parent._root.markNeedsLayout(); | |
| 396 } | |
| 397 _root.updateInlineStyle(inlineStyle); | |
| 398 | |
| 399 _syncChildren(oldSkyElementWrapper); | |
| 400 } | |
| 401 | |
| 402 void _syncChildren(SkyElementWrapper oldSkyElementWrapper) { | |
| 403 if (_root is! RenderCSSContainer) | |
| 404 return; | |
| 405 | |
| 406 var startIndex = 0; | |
| 407 var endIndex = children.length; | |
| 408 | |
| 409 var oldChildren = oldSkyElementWrapper.children; | |
| 410 var oldStartIndex = 0; | |
| 411 var oldEndIndex = oldChildren.length; | |
| 412 | |
| 413 RenderCSS nextSibling = null; | |
| 414 UINode currentNode = null; | |
| 415 UINode oldNode = null; | |
| 416 | |
| 417 void sync(int atIndex) { | |
| 418 children[atIndex] = _syncChild(currentNode, oldNode, _root, nextSibling); | |
| 419 assert(children[atIndex] != null); | |
| 420 } | |
| 421 | |
| 422 // Scan backwards from end of list while nodes can be directly synced | |
| 423 // without reordering. | |
| 424 while (endIndex > startIndex && oldEndIndex > oldStartIndex) { | |
| 425 currentNode = children[endIndex - 1]; | |
| 426 oldNode = oldChildren[oldEndIndex - 1]; | |
| 427 | |
| 428 if (currentNode._key != oldNode._key) { | |
| 429 break; | |
| 430 } | |
| 431 | |
| 432 endIndex--; | |
| 433 oldEndIndex--; | |
| 434 sync(endIndex); | |
| 435 } | |
| 436 | |
| 437 HashMap<String, UINode> oldNodeIdMap = null; | |
| 438 | |
| 439 bool oldNodeReordered(String key) { | |
| 440 return oldNodeIdMap != null && | |
| 441 oldNodeIdMap.containsKey(key) && | |
| 442 oldNodeIdMap[key] == null; | |
| 443 } | |
| 444 | |
| 445 void advanceOldStartIndex() { | |
| 446 oldStartIndex++; | |
| 447 while (oldStartIndex < oldEndIndex && | |
| 448 oldNodeReordered(oldChildren[oldStartIndex]._key)) { | |
| 449 oldStartIndex++; | |
| 450 } | |
| 451 } | |
| 452 | |
| 453 void ensureOldIdMap() { | |
| 454 if (oldNodeIdMap != null) | |
| 455 return; | |
| 456 | |
| 457 oldNodeIdMap = new HashMap<String, UINode>(); | |
| 458 for (int i = oldStartIndex; i < oldEndIndex; i++) { | |
| 459 var node = oldChildren[i]; | |
| 460 if (!node.interchangeable) | |
| 461 oldNodeIdMap.putIfAbsent(node._key, () => node); | |
| 462 } | |
| 463 } | |
| 464 | |
| 465 bool searchForOldNode() { | |
| 466 if (currentNode.interchangeable) | |
| 467 return false; // never re-order these nodes | |
| 468 | |
| 469 ensureOldIdMap(); | |
| 470 oldNode = oldNodeIdMap[currentNode._key]; | |
| 471 if (oldNode == null) | |
| 472 return false; | |
| 473 | |
| 474 oldNodeIdMap[currentNode._key] = null; // mark it reordered | |
| 475 assert(_root is RenderCSSContainer); | |
| 476 assert(oldNode._root is RenderCSSContainer); | |
| 477 oldSkyElementWrapper._root.remove(oldNode._root); | |
| 478 _root.add(oldNode._root, before: nextSibling); | |
| 479 return true; | |
| 480 } | |
| 481 | |
| 482 // Scan forwards, this time we may re-order; | |
| 483 nextSibling = _root.firstChild; | |
| 484 while (startIndex < endIndex && oldStartIndex < oldEndIndex) { | |
| 485 currentNode = children[startIndex]; | |
| 486 oldNode = oldChildren[oldStartIndex]; | |
| 487 | |
| 488 if (currentNode._key == oldNode._key) { | |
| 489 assert(currentNode.runtimeType == oldNode.runtimeType); | |
| 490 nextSibling = _root.childAfter(nextSibling); | |
| 491 sync(startIndex); | |
| 492 startIndex++; | |
| 493 advanceOldStartIndex(); | |
| 494 continue; | |
| 495 } | |
| 496 | |
| 497 oldNode = null; | |
| 498 searchForOldNode(); | |
| 499 sync(startIndex); | |
| 500 startIndex++; | |
| 501 } | |
| 502 | |
| 503 // New insertions | |
| 504 oldNode = null; | |
| 505 while (startIndex < endIndex) { | |
| 506 currentNode = children[startIndex]; | |
| 507 sync(startIndex); | |
| 508 startIndex++; | |
| 509 } | |
| 510 | |
| 511 // Removals | |
| 512 currentNode = null; | |
| 513 while (oldStartIndex < oldEndIndex) { | |
| 514 oldNode = oldChildren[oldStartIndex]; | |
| 515 _removeChild(oldNode); | |
| 516 advanceOldStartIndex(); | |
| 517 } | |
| 518 } | |
| 519 } | |
| 520 | |
| 521 class Container extends SkyElementWrapper { | |
| 522 | |
| 523 RenderCSSContainer _root; | |
| 524 RenderCSSContainer _createNode() => new RenderCSSContainer(this); | |
| 525 | |
| 526 static final Container _emptyContainer = new Container(); | |
| 527 | |
| 528 SkyNodeWrapper get _emptyNode => _emptyContainer; | |
| 529 | |
| 530 Container({ | |
| 531 Object key, | |
| 532 List<UINode> children, | |
| 533 Style style, | |
| 534 String inlineStyle | |
| 535 }) : super( | |
| 536 key: key, | |
| 537 children: children, | |
| 538 style: style, | |
| 539 inlineStyle: inlineStyle | |
| 540 ); | |
| 541 } | |
| 542 | |
| 543 class Paragraph extends SkyElementWrapper { | |
| 544 | |
| 545 RenderCSSParagraph _root; | |
| 546 RenderCSSParagraph _createNode() => new RenderCSSParagraph(this); | |
| 547 | |
| 548 static final Paragraph _emptyContainer = new Paragraph(); | |
| 549 | |
| 550 SkyNodeWrapper get _emptyNode => _emptyContainer; | |
| 551 | |
| 552 Paragraph({ | |
| 553 Object key, | |
| 554 List<UINode> children, | |
| 555 Style style, | |
| 556 String inlineStyle | |
| 557 }) : super( | |
| 558 key: key, | |
| 559 children: children, | |
| 560 style: style, | |
| 561 inlineStyle: inlineStyle | |
| 562 ); | |
| 563 } | |
| 564 | |
| 565 class FlexContainer extends SkyElementWrapper { | |
| 566 | |
| 567 RenderCSSFlex _root; | |
| 568 RenderCSSFlex _createNode() => new RenderCSSFlex(this, this.direction); | |
| 569 | |
| 570 static final FlexContainer _emptyContainer = new FlexContainer(); | |
| 571 // direction doesn't matter if it's empty | |
| 572 | |
| 573 SkyNodeWrapper get _emptyNode => _emptyContainer; | |
| 574 | |
| 575 final FlexDirection direction; | |
| 576 | |
| 577 FlexContainer({ | |
| 578 Object key, | |
| 579 List<UINode> children, | |
| 580 Style style, | |
| 581 String inlineStyle, | |
| 582 this.direction: FlexDirection.Row | |
| 583 }) : super( | |
| 584 key: key, | |
| 585 children: children, | |
| 586 style: style, | |
| 587 inlineStyle: inlineStyle | |
| 588 ); | |
| 589 | |
| 590 void _syncNode(UINode old) { | |
| 591 super._syncNode(old); | |
| 592 _root.direction = direction; | |
| 593 } | |
| 594 } | |
| 595 | |
| 596 class TextFragment extends SkyElementWrapper { | |
| 597 | |
| 598 RenderCSSInline _root; | |
| 599 RenderCSSInline _createNode() => new RenderCSSInline(this, this.data); | |
| 600 | |
| 601 static final TextFragment _emptyText = new TextFragment(''); | |
| 602 | |
| 603 SkyNodeWrapper get _emptyNode => _emptyText; | |
| 604 | |
| 605 final String data; | |
| 606 | |
| 607 TextFragment(this.data, { | |
| 608 Object key, | |
| 609 Style style, | |
| 610 String inlineStyle | |
| 611 }) : super( | |
| 612 key: key, | |
| 613 style: style, | |
| 614 inlineStyle: inlineStyle | |
| 615 ); | |
| 616 | |
| 617 void _syncNode(UINode old) { | |
| 618 super._syncNode(old); | |
| 619 _root.data = data; | |
| 620 } | |
| 621 } | |
| 622 | |
| 623 class Image extends SkyElementWrapper { | |
| 624 | |
| 625 RenderCSSImage _root; | |
| 626 RenderCSSImage _createNode() => new RenderCSSImage(this, this.src, this.width,
this.height); | |
| 627 | |
| 628 static final Image _emptyImage = new Image(); | |
| 629 | |
| 630 SkyNodeWrapper get _emptyNode => _emptyImage; | |
| 631 | |
| 632 final String src; | |
| 633 final int width; | |
| 634 final int height; | |
| 635 | |
| 636 Image({ | |
| 637 Object key, | |
| 638 Style style, | |
| 639 String inlineStyle, | |
| 640 this.width, | |
| 641 this.height, | |
| 642 this.src | |
| 643 }) : super( | |
| 644 key: key, | |
| 645 style: style, | |
| 646 inlineStyle: inlineStyle | |
| 647 ); | |
| 648 | |
| 649 void _syncNode(UINode old) { | |
| 650 super._syncNode(old); | |
| 651 _root.configure(this.src, this.width, this.height); | |
| 652 } | |
| 653 } | |
| 654 | |
| 655 | |
| 656 Set<Component> _mountedComponents = new HashSet<Component>(); | |
| 657 Set<Component> _unmountedComponents = new HashSet<Component>(); | |
| 658 | |
| 659 void _enqueueDidMount(Component c) { | |
| 660 assert(!_notifingMountStatus); | |
| 661 _mountedComponents.add(c); | |
| 662 } | |
| 663 | |
| 664 void _enqueueDidUnmount(Component c) { | |
| 665 assert(!_notifingMountStatus); | |
| 666 _unmountedComponents.add(c); | |
| 667 } | |
| 668 | |
| 669 bool _notifingMountStatus = false; | |
| 670 | |
| 671 void _notifyMountStatusChanged() { | |
| 672 try { | |
| 673 _notifingMountStatus = true; | |
| 674 _unmountedComponents.forEach((c) => c._didUnmount()); | |
| 675 _mountedComponents.forEach((c) => c._didMount()); | |
| 676 _mountedComponents.clear(); | |
| 677 _unmountedComponents.clear(); | |
| 678 } finally { | |
| 679 _notifingMountStatus = false; | |
| 680 } | |
| 681 } | |
| 682 | |
| 683 List<Component> _dirtyComponents = new List<Component>(); | |
| 684 bool _buildScheduled = false; | |
| 685 bool _inRenderDirtyComponents = false; | |
| 686 | |
| 687 void _buildDirtyComponents() { | |
| 688 _tracing.begin('fn::_buildDirtyComponents'); | |
| 689 | |
| 690 Stopwatch sw; | |
| 691 if (_shouldLogRenderDuration) | |
| 692 sw = new Stopwatch()..start(); | |
| 693 | |
| 694 try { | |
| 695 _inRenderDirtyComponents = true; | |
| 696 | |
| 697 _dirtyComponents.sort((a, b) => a._order - b._order); | |
| 698 for (var comp in _dirtyComponents) { | |
| 699 comp._buildIfDirty(); | |
| 700 } | |
| 701 | |
| 702 _dirtyComponents.clear(); | |
| 703 _buildScheduled = false; | |
| 704 } finally { | |
| 705 _inRenderDirtyComponents = false; | |
| 706 } | |
| 707 | |
| 708 _notifyMountStatusChanged(); | |
| 709 | |
| 710 if (_shouldLogRenderDuration) { | |
| 711 sw.stop(); | |
| 712 print('Render took ${sw.elapsedMicroseconds} microseconds'); | |
| 713 } | |
| 714 | |
| 715 _tracing.end('fn::_buildDirtyComponents'); | |
| 716 } | |
| 717 | |
| 718 void _scheduleComponentForRender(Component c) { | |
| 719 assert(!_inRenderDirtyComponents); | |
| 720 _dirtyComponents.add(c); | |
| 721 | |
| 722 if (!_buildScheduled) { | |
| 723 _buildScheduled = true; | |
| 724 new Future.microtask(_buildDirtyComponents); | |
| 725 } | |
| 726 } | |
| 727 | |
| 728 abstract class Component extends UINode { | |
| 729 bool get _isBuilding => _currentlyBuilding == this; | |
| 730 bool _dirty = true; | |
| 731 | |
| 732 UINode _built; | |
| 733 final int _order; | |
| 734 static int _currentOrder = 0; | |
| 735 bool _stateful; | |
| 736 static Component _currentlyBuilding; | |
| 737 List<Function> _mountCallbacks; | |
| 738 List<Function> _unmountCallbacks; | |
| 739 | |
| 740 void onDidMount(Function fn) { | |
| 741 if (_mountCallbacks == null) | |
| 742 _mountCallbacks = new List<Function>(); | |
| 743 | |
| 744 _mountCallbacks.add(fn); | |
| 745 } | |
| 746 | |
| 747 void onDidUnmount(Function fn) { | |
| 748 if (_unmountCallbacks == null) | |
| 749 _unmountCallbacks = new List<Function>(); | |
| 750 | |
| 751 _unmountCallbacks.add(fn); | |
| 752 } | |
| 753 | |
| 754 | |
| 755 Component({ Object key, bool stateful }) | |
| 756 : _stateful = stateful != null ? stateful : false, | |
| 757 _order = _currentOrder + 1, | |
| 758 super(key: key); | |
| 759 | |
| 760 Component.fromArgs(Object key, bool stateful) | |
| 761 : this(key: key, stateful: stateful); | |
| 762 | |
| 763 void _didMount() { | |
| 764 if (_mountCallbacks != null) | |
| 765 _mountCallbacks.forEach((fn) => fn()); | |
| 766 } | |
| 767 | |
| 768 void _didUnmount() { | |
| 769 if (_unmountCallbacks != null) | |
| 770 _unmountCallbacks.forEach((fn) => fn()); | |
| 771 } | |
| 772 | |
| 773 // TODO(rafaelw): It seems wrong to expose DOM at all. This is presently | |
| 774 // needed to get sizing info. | |
| 775 RenderCSS getRoot() => _root; | |
| 776 | |
| 777 void _remove() { | |
| 778 assert(_built != null); | |
| 779 assert(_root != null); | |
| 780 _removeChild(_built); | |
| 781 _built = null; | |
| 782 _enqueueDidUnmount(this); | |
| 783 super._remove(); | |
| 784 } | |
| 785 | |
| 786 bool _willSync(UINode old) { | |
| 787 Component oldComponent = old as Component; | |
| 788 if (oldComponent == null || !oldComponent._stateful) | |
| 789 return false; | |
| 790 | |
| 791 // Make |this| the "old" Component | |
| 792 _stateful = false; | |
| 793 _built = oldComponent._built; | |
| 794 assert(_built != null); | |
| 795 | |
| 796 // Make |oldComponent| the "new" component | |
| 797 reflect.copyPublicFields(this, oldComponent); | |
| 798 oldComponent._built = null; | |
| 799 oldComponent._dirty = true; | |
| 800 return true; | |
| 801 } | |
| 802 | |
| 803 /* There are three cases here: | |
| 804 * 1) Building for the first time: | |
| 805 * assert(_built == null && old == null) | |
| 806 * 2) Re-building (because a dirty flag got set): | |
| 807 * assert(_built != null && old == null) | |
| 808 * 3) Syncing against an old version | |
| 809 * assert(_built == null && old != null) | |
| 810 */ | |
| 811 void _sync(UINode old, RenderCSSContainer host, RenderCSS insertBefore) { | |
| 812 assert(!_defunct); | |
| 813 assert(_built == null || old == null); | |
| 814 | |
| 815 Component oldComponent = old as Component; | |
| 816 | |
| 817 var oldBuilt; | |
| 818 if (oldComponent == null) { | |
| 819 oldBuilt = _built; | |
| 820 } else { | |
| 821 assert(_built == null); | |
| 822 oldBuilt = oldComponent._built; | |
| 823 } | |
| 824 | |
| 825 if (oldBuilt == null) | |
| 826 _enqueueDidMount(this); | |
| 827 | |
| 828 int lastOrder = _currentOrder; | |
| 829 _currentOrder = _order; | |
| 830 _currentlyBuilding = this; | |
| 831 _built = build(); | |
| 832 _currentlyBuilding = null; | |
| 833 _currentOrder = lastOrder; | |
| 834 | |
| 835 _built = _syncChild(_built, oldBuilt, host, insertBefore); | |
| 836 _dirty = false; | |
| 837 _root = _built._root; | |
| 838 assert(_root != null); | |
| 839 } | |
| 840 | |
| 841 void _buildIfDirty() { | |
| 842 if (!_dirty || _defunct) | |
| 843 return; | |
| 844 | |
| 845 _trace('$_key rebuilding...'); | |
| 846 _sync(null, null, null); // TODO(ianh): figure out how passing "null, null,
null" here is ok | |
| 847 } | |
| 848 | |
| 849 void scheduleBuild() { | |
| 850 setState(() {}); | |
| 851 } | |
| 852 | |
| 853 void setState(Function fn()) { | |
| 854 _stateful = true; | |
| 855 fn(); | |
| 856 if (_isBuilding || _dirty || _defunct) | |
| 857 return; | |
| 858 | |
| 859 _dirty = true; | |
| 860 _scheduleComponentForRender(this); | |
| 861 } | |
| 862 | |
| 863 UINode build(); | |
| 864 } | |
| 865 | |
| 866 abstract class App extends Component { | |
| 867 RenderCSS _host; | |
| 868 | |
| 869 App() : super(stateful: true) { | |
| 870 _host = new RenderCSSRoot(this); | |
| 871 _scheduleComponentForRender(this); | |
| 872 } | |
| 873 | |
| 874 void _buildIfDirty() { | |
| 875 if (!_dirty || _defunct) | |
| 876 return; | |
| 877 | |
| 878 _trace('$_key rebuilding...'); | |
| 879 _sync(null, _host, _root); | |
| 880 } | |
| 881 } | |
| 882 | |
| 883 class Text extends Component { | |
| 884 Text(this.data) : super(key: '*text*'); | |
| 885 final String data; | |
| 886 bool get interchangeable => true; | |
| 887 UINode build() => new Paragraph(children: [new TextFragment(data)]); | |
| 888 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1132063007:
Rationalize Dart mojo and sky package structure (Closed)
Base URL: https://github.com/domokit/mojo.git@master