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annotate pyink/consistency.py @ 1257:027cd060d9ba

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Remove the key frame if associated scene node or scene group being removed.
author Thinker K.F. Li <thinker@codemud.net>
date Tue, 11 Jan 2011 15:03:01 +0800
parents 07e0cb1e051d
children 6177f5d0ef01
rev   line source
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07e0cb1e051d Add class consistency_checker for domview_ui.
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 ## \brief Check consistency of a DOM-tree associated with a domview_ui.
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5 #
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6 # This is a co-worker of \ref domview_ui to check DOM-tree and make
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7 # sure consistency of scenes, scene groups in the DOM-tree. It also
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8 # updates layer list of \ref domview_ui to reflect last changes of the
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9 # DOM-tree.
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10 #
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11 # Since it is a consistency checker, it must well understanding
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12 # structure that expected by domview_ui. So, this class is highly
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13 # closed to the internal of \ref domview_ui. It is separated from
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14 # domview_ui for collecting related logic and functions in a place to
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15 # set up a clear boundary from the functions provided by \ref
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16 # domview_ui.
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17 #
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18 # This class is expected to access private variables of \ref
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19 # domview_ui. But, use public interface of domview_ui if possible.
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20 #
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21 # This class is also monitored by \ref data_monitor to monitor the
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22 # accessing to domview_ui.
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23 #
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24 class consistency_checker(object):
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25 __metaclass__ = data_monitor
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26
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27 def __init__(self, domview_ui):
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28 self._domview = domview_ui
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29 self._doc = None
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30 self._root = None
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31 pass
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32
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33 def _start_check(self):
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34 doc = self._doc
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35 dom_event.addEventListener(doc, 'DOMNodeInserted',
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36 self.do_insert_node, None)
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37 dom_event.addEventListener(doc, 'DOMNodeRemoved',
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38 self.do_remove_node, None)
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39 dom_event.addEventListener(doc, 'DOMAttrModified',
07e0cb1e051d Add class consistency_checker for domview_ui.
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40 self.do_attr_modified, None)
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41 pass
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42
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43 ## \brief Handle a new document.
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44 #
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45 # This method is called by domview_ui.handle_doc_root().
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46 #
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47 def handle_doc_root(self, doc, root):
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48 self._doc = doc
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49 self._root = root
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50
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51 self._start_check()
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52 pass
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53
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54 def _remove_node_recursive(self, node, child):
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55 for cchild in child.childList():
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56 self._remove_node_recursive(child, cchild)
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57 pass
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58
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59 child_name = child.name()
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60 if child_name not in ('ns0:scene', 'svg:g'):
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61 return
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62
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63 #
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64 # Remove the key frame assocated with a removed scene node or
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65 # scene group if we can find the key frame.
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66 #
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67 if child_name == 'ns0:scene':
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68 try:
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69 group_id = child.getAttribute('ref')
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70 except:
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71 return
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72 elif child_name == 'svg:g':
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73 try:
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74 group_id = child.getAttribute('id')
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75 except:
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76 return
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77 pass
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78
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79 try:
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80 layer_idx, (start, end, tween_type) = \
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81 self._domview.find_key_from_group(group_id)
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82 except ValueError:
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83 pass
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84 else: # We have found the key frame.
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85 self._domview.unmark_key(layer_idx, start)
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86 pass
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parents: 1253
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87 pass
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88
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89 def do_insert_node(self, node, child):
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90 pass
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91
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92 def do_remove_node(self, node, child):
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93 self._remove_node_recursive(node, child)
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94 pass
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95
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96 def do_attr_modified(self, node, name, old_value, new_value):
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97 pass
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98 pass