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comparison pyink/unlink_clone.py @ 1299:6949e2b6cae2

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Add unlink clone checker. - Monitor changes of DOM-tree of the document - Unlinking a clone is actually removing the clone and copying nodes from the source. - Copy value of ID of a node to saved_id to track source of copy nodes. - For a new node with 'saved_id' is a copy of another node. - Copy vulae of 'saved_id' to 'ns0:duplicate-src' to keep the source - Change value of 'saved_id' to the value of ID of the node for later copying. - For a new node without 'saved_id' is not a copy of another node. - only set 'saved_id' to the value of its ID.
author Thinker K.F. Li <thinker@codemud.net>
date Sun, 16 Jan 2011 16:13:37 +0800
parents
children 2a35a1cb6cdf
comparison
equal deleted inserted replaced
1298:2a5da457474d 1299:6949e2b6cae2
1 import dom_event
2 from data_monitor import data_monitor
3
4 class unlink_clone_checker(object):
5 __metaclass__ = data_monitor
6
7 _no_change_attrs = ('ns0:duplicate-src', 'saved_id')
8
9 def __init__(self, domview_ui):
10 self._domviewui = domview_ui
11 self._locker = domview_ui
12 self._doc = None
13 self._root = None
14 pass
15
16 def _start_check(self):
17 doc = self._doc
18 dom_event.addEventListener(doc, 'DOMNodeInserted',
19 self.do_insert_node, None)
20 dom_event.addEventListener(doc, 'DOMAttrModified',
21 self.do_attr_modified, None)
22 pass
23
24 def handle_doc_root(self, doc, root):
25 self._doc = doc
26 self._root = root
27
28 self._start_check()
29 pass
30
31 def _handle_unlinked_or_copied_nodes(self, node, child):
32 try:
33 saved_id = child.getAttribute('saved_id')
34 except: # Skip it for losting saved_id
35 pass
36 else:
37 child.setAttribute('ns0:duplicate-src', saved_id)
38 pass
39
40 try:
41 child_id = child.getAttribute('id')
42 except: # still have no ID.
43 pass # Assign saved_id later with attr
44 # modified event.
45 else:
46 child.setAttribute('saved_id', child_id)
47 pass
48 pass
49
50 def _handle_new_nodes(self, node, child):
51 if child.name() == 'svg:use':
52 return
53
54 try:
55 child_id = child.getAttribute('id')
56 except KeyError:
57 return
58 child.setAttribute('saved_id', child_id)
59 pass
60
61 ## \brief Check inserted node recurisvely.
62 #
63 # Travel the tree in post-order.
64 #
65 def _handle_insert_node_recursive(self, node, child):
66 #
67 # Traveling forest of children.
68 #
69 for cchild in child.childList():
70 self._handle_insert_node_recursive(child, cchild)
71 pass
72
73 #
74 # Visit the node
75 #
76 try:
77 child_id = child.getAttribute('saved_id')
78 except KeyError: # have no saved_id
79 pass
80 else:
81 self._handle_unlinked_or_copied_nodes(node, child)
82 return
83
84 # have no saved_id
85 self._handle_new_nodes(node, child)
86 pass
87
88 def do_insert_node(self, node, child):
89 self._handle_insert_node_recursive(node, child)
90 pass
91
92 def do_attr_modified(self, node, name, old_value, new_value):
93 if name == 'id' and node.name() != 'svg:use':
94 #
95 # The ID of a node may not be assigned when it being
96 # inserted, and be assigned later. So, we checking
97 # attribute modification event to assign value of
98 # saved_id.
99 #
100 node.setAttribute('saved_id', new_value)
101 elif old_value and (name in self._no_change_attrs):
102 #
103 # Restore to old value for attributes that is not allowed
104 # to be changed by the user.
105 #
106 node.setAttribute(name, old_value)
107 pass
108 pass
109 pass