Mercurial > MadButterfly

annotate pyink/unlink_clone.py @ 1336:0b5ee9c90af7

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Update components and timelines list for async changes on DOM
author Thinker K.F. Li <thinker@codemud.net>
date Tue, 01 Feb 2011 23:20:26 +0800
parents 2a35a1cb6cdf
children
rev   line source
1299
6949e2b6cae2 Add unlink clone checker.
Thinker K.F. Li <thinker@codemud.net>
parents:
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1 import dom_event
6949e2b6cae2 Add unlink clone checker.
Thinker K.F. Li <thinker@codemud.net>
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2 from data_monitor import data_monitor
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3
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2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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4 ## \brief Tracking relation-ship btween copy nodes and source nodes.
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Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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5 #
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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6 # To trace the relation-ship between source node and copy node, we add
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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7 # 'ns0:duplicate-src' attribute to copy nodes. But after unlink a
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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8 # clone node, inkscape does not copy attributes of 'svg:use' node to
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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9 # new nodes inserted after unlinking. So, we can not just putting
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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10 # 'ns0:duplicate-src' on 'svg:use' and hoping it is still working for
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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11 # us after unlinking.
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Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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12 #
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Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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13 # The solution is to duplicate value of 'id' attribute to 'saved_id'
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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14 # attribute for every node. Whenever Inkscape copying nodes for a
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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15 # copy & paste or an unlinking, the value of 'saved_id' attribute
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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16 # would be copied to copy nodes from source nodes. We copy the value
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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17 # of 'saved_id' attribute to 'ns0:duplicate-src', for copy node, to
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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18 # preserve the relation-ship of copy node and source node. After copy
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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19 # 'saved_id' to 'ns0:duplicate-src', 'saved_id' is re-assigned to the
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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20 # value of ID of copy node. A copy node is the new node of a copying.
2a35a1cb6cdf Add comment for unlink_clone.py
Thinker K.F. Li <thinker@codemud.net>
parents: 1299
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21 #
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22 class unlink_clone_checker(object):
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23 __metaclass__ = data_monitor
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24
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25 _no_change_attrs = ('ns0:duplicate-src', 'saved_id')
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26
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27 def __init__(self, domview_ui):
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28 self._domviewui = domview_ui
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29 self._locker = domview_ui
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Thinker K.F. Li <thinker@codemud.net>
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30 self._doc = None
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31 self._root = None
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32 pass
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33
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34 def _start_check(self):
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35 doc = self._doc
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36 dom_event.addEventListener(doc, 'DOMNodeInserted',
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Thinker K.F. Li <thinker@codemud.net>
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37 self.do_insert_node, None)
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38 dom_event.addEventListener(doc, 'DOMAttrModified',
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Thinker K.F. Li <thinker@codemud.net>
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39 self.do_attr_modified, None)
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40 pass
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41
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42 def handle_doc_root(self, doc, root):
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43 self._doc = doc
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44 self._root = root
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45
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46 self._start_check()
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47 pass
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48
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49 def _handle_unlinked_or_copied_nodes(self, node, child):
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50 try:
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51 saved_id = child.getAttribute('saved_id')
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52 except: # Skip it for losting saved_id
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53 pass
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54 else:
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55 child.setAttribute('ns0:duplicate-src', saved_id)
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56 pass
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57
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58 try:
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59 child_id = child.getAttribute('id')
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60 except: # still have no ID.
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61 pass # Assign saved_id later with attr
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62 # modified event.
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63 else:
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64 child.setAttribute('saved_id', child_id)
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65 pass
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66 pass
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67
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68 def _handle_new_nodes(self, node, child):
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69 if child.name() == 'svg:use':
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70 return
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71
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72 try:
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73 child_id = child.getAttribute('id')
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74 except KeyError:
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75 return
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76 child.setAttribute('saved_id', child_id)
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77 pass
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78
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79 ## \brief Check inserted node recurisvely.
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80 #
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81 # Travel the tree in post-order.
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82 #
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83 def _handle_insert_node_recursive(self, node, child):
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84 #
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85 # Traveling forest of children.
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86 #
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87 for cchild in child.childList():
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88 self._handle_insert_node_recursive(child, cchild)
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89 pass
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90
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91 #
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92 # Visit the node
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93 #
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94 try:
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95 child_id = child.getAttribute('saved_id')
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96 except KeyError: # have no saved_id
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97 pass
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98 else:
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99 self._handle_unlinked_or_copied_nodes(node, child)
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100 return
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101
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102 # have no saved_id
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103 self._handle_new_nodes(node, child)
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104 pass
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105
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106 def do_insert_node(self, node, child):
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107 self._handle_insert_node_recursive(node, child)
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108 pass
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109
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110 def do_attr_modified(self, node, name, old_value, new_value):
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111 if name == 'id' and node.name() != 'svg:use' and new_value:
1299
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112 #
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113 # The ID of a node may not be assigned when it being
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114 # inserted, and be assigned later. So, we checking
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115 # attribute modification event to assign value of
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116 # saved_id.
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117 #
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118 node.setAttribute('saved_id', new_value)
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119 elif old_value and (name in self._no_change_attrs):
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120 #
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121 # Restore to old value for attributes that is not allowed
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122 # to be changed by the user.
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123 #
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124 node.setAttribute(name, old_value)
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125 pass
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126 pass
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127 pass