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| 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | |
| 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. | |
| 4 | |
| 5 library trydart.shadow_root; | |
| 6 | |
| 7 import 'dart:html'; | |
| 8 | |
| 9 import 'selection.dart' show | |
| 10 TrySelection; | |
| 11 | |
| 12 import 'html_to_text.dart' show | |
| 13 htmlToText; | |
| 14 | |
| 15 const int WALKER_NEXT = 0; | |
| 16 const int WALKER_RETURN = 1; | |
| 17 const int WALKER_SKIP_NODE = 2; | |
| 18 | |
| 19 void setShadowRoot(Element node, text) { | |
| 20 if (text is String) { | |
| 21 text = new Text(text); | |
| 22 } | |
| 23 getShadowRoot(node) | |
| 24 ..nodes.clear() | |
| 25 ..append(text); | |
| 26 } | |
| 27 | |
| 28 | |
| 29 /* ShadowRoot or Element */ getShadowRoot(Element node) { | |
| 30 if (ShadowRoot.supported) { | |
| 31 ShadowRoot root = node.shadowRoot; | |
| 32 return root != null ? root : node.createShadowRoot(); | |
| 33 } else { | |
| 34 Element root = node.querySelector('[try-dart-shadow-root]'); | |
| 35 if (root == null) { | |
| 36 root = new SpanElement() | |
| 37 ..setAttribute('try-dart-shadow-root', ''); | |
| 38 node.append(root); | |
| 39 } | |
| 40 return root; | |
| 41 } | |
| 42 } | |
| 43 | |
| 44 String getText(Element node) { | |
| 45 if (ShadowRoot.supported) return node.text; | |
| 46 StringBuffer buffer = new StringBuffer(); | |
| 47 htmlToText( | |
| 48 node, buffer, new TrySelection.empty(node), treatRootAsInline: true); | |
| 49 return '$buffer'; | |
| 50 } | |
| 51 | |
| 52 /// Element.contains(n) doesn't work when n is node(Text) in IE, | |
| 53 /// so this is a brute-force implementation of contains. | |
| 54 bool containsNode(parent, child) { | |
| 55 var p = child; | |
| 56 while (p != null && p != parent) { | |
| 57 p = p.parentNode; | |
| 58 } | |
| 59 return p != null; | |
| 60 } | |
| 61 | |
| 62 /// Position [walker] at the last predecessor (that is, child of child of | |
| 63 /// child...) of [node]. The next call to walker.nextNode will return the first | |
| 64 /// node after [node]. | |
| 65 void skip(Node node, TreeWalker walker) { | |
| 66 if (walker.nextSibling() != null) { | |
| 67 walker.previousNode(); | |
| 68 return; | |
| 69 } | |
| 70 for (Node current = walker.nextNode(); | |
| 71 current != null; | |
| 72 current = walker.nextNode()) { | |
| 73 if (!containsNode(node, current)) { | |
| 74 walker.previousNode(); | |
| 75 return; | |
| 76 } | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 /// Call [f] on each node in [root] in same order as [TreeWalker]. Skip any | |
| 81 /// nodes used to implement shadow root polyfill. | |
| 82 void walkNodes(Node root, int f(Node node)) { | |
| 83 TreeWalker walker = new TreeWalker(root, NodeFilter.SHOW_ALL); | |
| 84 | |
| 85 for (Node node = root; node != null; node = walker.nextNode()) { | |
| 86 if (!ShadowRoot.supported && | |
| 87 node is Element && | |
| 88 node.getAttribute('try-dart-shadow-root') != null) { | |
| 89 skip(node, walker); | |
| 90 } else { | |
| 91 int action = f(node); | |
| 92 switch (action) { | |
| 93 case WALKER_RETURN: | |
| 94 return; | |
| 95 case WALKER_SKIP_NODE: | |
| 96 skip(node, walker); | |
| 97 break; | |
| 98 case WALKER_NEXT: | |
| 99 break; | |
| 100 default: | |
| 101 throw 'Unexpected action returned from [f]: $action'; | |
| 102 } | |
| 103 } | |
| 104 } | |
| 105 } | |
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