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annotate 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
rev   line source
1299
6949e2b6cae2 Add unlink clone checker.
Thinker K.F. Li <thinker@codemud.net>
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1 import dom_event
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2 from data_monitor import data_monitor
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3
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4 class unlink_clone_checker(object):
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5 __metaclass__ = data_monitor
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6
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7 _no_change_attrs = ('ns0:duplicate-src', 'saved_id')
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8
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9 def __init__(self, domview_ui):
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10 self._domviewui = domview_ui
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11 self._locker = domview_ui
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12 self._doc = None
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13 self._root = None
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14 pass
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15
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16 def _start_check(self):
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17 doc = self._doc
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18 dom_event.addEventListener(doc, 'DOMNodeInserted',
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19 self.do_insert_node, None)
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20 dom_event.addEventListener(doc, 'DOMAttrModified',
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21 self.do_attr_modified, None)
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22 pass
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23
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24 def handle_doc_root(self, doc, root):
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25 self._doc = doc
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26 self._root = root
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27
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28 self._start_check()
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29 pass
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30
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31 def _handle_unlinked_or_copied_nodes(self, node, child):
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32 try:
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33 saved_id = child.getAttribute('saved_id')
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34 except: # Skip it for losting saved_id
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35 pass
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36 else:
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37 child.setAttribute('ns0:duplicate-src', saved_id)
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38 pass
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39
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40 try:
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41 child_id = child.getAttribute('id')
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42 except: # still have no ID.
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43 pass # Assign saved_id later with attr
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44 # modified event.
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45 else:
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46 child.setAttribute('saved_id', child_id)
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47 pass
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48 pass
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49
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50 def _handle_new_nodes(self, node, child):
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51 if child.name() == 'svg:use':
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52 return
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53
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54 try:
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55 child_id = child.getAttribute('id')
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56 except KeyError:
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57 return
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58 child.setAttribute('saved_id', child_id)
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59 pass
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60
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61 ## \brief Check inserted node recurisvely.
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62 #
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63 # Travel the tree in post-order.
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64 #
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65 def _handle_insert_node_recursive(self, node, child):
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66 #
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67 # Traveling forest of children.
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68 #
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69 for cchild in child.childList():
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70 self._handle_insert_node_recursive(child, cchild)
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71 pass
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72
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73 #
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74 # Visit the node
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75 #
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76 try:
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77 child_id = child.getAttribute('saved_id')
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78 except KeyError: # have no saved_id
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79 pass
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80 else:
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81 self._handle_unlinked_or_copied_nodes(node, child)
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82 return
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83
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84 # have no saved_id
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85 self._handle_new_nodes(node, child)
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86 pass
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87
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88 def do_insert_node(self, node, child):
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89 self._handle_insert_node_recursive(node, child)
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90 pass
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91
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92 def do_attr_modified(self, node, name, old_value, new_value):
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93 if name == 'id' and node.name() != 'svg:use':
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94 #
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95 # The ID of a node may not be assigned when it being
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96 # inserted, and be assigned later. So, we checking
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97 # attribute modification event to assign value of
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98 # saved_id.
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99 #
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100 node.setAttribute('saved_id', new_value)
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101 elif old_value and (name in self._no_change_attrs):
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102 #
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103 # Restore to old value for attributes that is not allowed
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104 # to be changed by the user.
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105 #
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106 node.setAttribute(name, old_value)
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107 pass
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108 pass
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109 pass