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1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | 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 | 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 library trydart.selection; | 5 library trydart.selection; |
6 | 6 |
7 import 'dart:html' show | 7 import 'dart:html' show |
8 CharacterData, | 8 CharacterData, |
9 Element, | |
9 Node, | 10 Node, |
10 NodeFilter, | 11 NodeFilter, |
11 Selection, | 12 Selection, |
12 Text, | 13 Text, |
13 TreeWalker; | 14 TreeWalker; |
14 | 15 |
16 import 'shadow_root.dart' show | |
17 WALKER_NEXT, | |
18 WALKER_RETURN, | |
19 walkNodes; | |
20 | |
15 import 'decoration.dart'; | 21 import 'decoration.dart'; |
16 | 22 |
17 class TrySelection { | 23 class TrySelection { |
18 final Node root; | 24 final Node root; |
19 Node anchorNode; | 25 Node anchorNode; |
20 int anchorOffset; | 26 int anchorOffset; |
21 | 27 |
22 String text; | 28 String text; |
23 int globalOffset = -1; | 29 int globalOffset = -1; |
24 | 30 |
25 TrySelection(this.root, Selection selection) | 31 TrySelection(this.root, Selection selection) |
26 : anchorNode = isCollapsed(selection) ? selection.anchorNode : null, | 32 : anchorNode = isCollapsed(selection) ? selection.anchorNode : null, |
27 anchorOffset = isCollapsed(selection) ? selection.anchorOffset : -1; | 33 anchorOffset = isCollapsed(selection) ? selection.anchorOffset : -1; |
28 | 34 |
29 TrySelection.empty(this.root) | 35 TrySelection.empty(this.root) |
30 : anchorNode = null, | 36 : anchorNode = null, |
31 anchorOffset = -1; | 37 anchorOffset = -1; |
32 | 38 |
33 Text addNodeFromSubstring(int start, | 39 Text addNodeFromSubstring(int start, |
34 int end, | 40 int end, |
35 List<Node> nodes, | 41 List<Node> nodes, |
36 [Decoration decoration]) { | 42 [Decoration decoration]) { |
37 if (start == end) return null; | 43 if (start == end) return null; |
ahe
2014/07/04 13:52:00
This check prevents adding empty Text nodes. I had
| |
38 | 44 |
39 Text textNode = new Text(text.substring(start, end)); | 45 Text textNode = new Text(text.substring(start, end)); |
40 | 46 |
41 if (start <= globalOffset && globalOffset <= end) { | 47 if (start <= globalOffset && globalOffset <= end) { |
42 anchorNode = textNode; | 48 anchorNode = textNode; |
43 anchorOffset = globalOffset - start; | 49 anchorOffset = globalOffset - start; |
44 } | 50 } |
45 | 51 |
46 nodes.add(decoration == null ? textNode : decoration.applyTo(textNode)); | 52 nodes.add(decoration == null ? textNode : decoration.applyTo(textNode)); |
47 | 53 |
(...skipping 15 matching lines...) Expand all Loading... | |
63 return new TrySelection.empty(root) | 69 return new TrySelection.empty(root) |
64 ..anchorNode = anchorNode | 70 ..anchorNode = anchorNode |
65 ..anchorOffset = anchorOffset; | 71 ..anchorOffset = anchorOffset; |
66 } | 72 } |
67 | 73 |
68 /// Computes the global offset, that is, the offset from [root]. | 74 /// Computes the global offset, that is, the offset from [root]. |
69 static int computeGlobalOffset(Node root, Node anchorNode, int anchorOffset) { | 75 static int computeGlobalOffset(Node root, Node anchorNode, int anchorOffset) { |
70 if (anchorOffset == -1) return -1; | 76 if (anchorOffset == -1) return -1; |
71 | 77 |
72 int offset = 0; | 78 int offset = 0; |
73 TreeWalker walker = new TreeWalker(root, NodeFilter.SHOW_TEXT); | 79 bool found = false; |
74 for (Node node = walker.nextNode(); | 80 walkNodes(root, (Node node) { |
75 node != null; | 81 if (anchorNode == node) { |
76 node = walker.nextNode()) { | 82 offset += anchorOffset; |
77 CharacterData text = node; | 83 found = true; |
78 if (anchorNode == text) { | 84 return WALKER_RETURN; |
79 return anchorOffset + offset; | |
80 } | 85 } |
81 offset += text.data.length; | 86 switch (node.nodeType) { |
82 } | 87 case Node.CDATA_SECTION_NODE: |
83 | 88 case Node.TEXT_NODE: |
84 return -1; | 89 CharacterData text = node; |
90 offset += text.data.length; | |
91 break; | |
92 } | |
93 return WALKER_NEXT; | |
94 }); | |
95 return found ? offset : -1; | |
85 } | 96 } |
86 } | 97 } |
87 | 98 |
88 bool isCollapsed(Selection selection) { | 99 bool isCollapsed(Selection selection) { |
89 // Firefox and Chrome don't agree on if the selection is collapsed if there | 100 // Firefox and Chrome don't agree on if the selection is collapsed if there |
90 // is no node selected. | 101 // is no node selected. |
91 return selection.isCollapsed && selection.anchorNode != null; | 102 return selection.isCollapsed && selection.anchorNode != null; |
92 } | 103 } |
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