Source Code for Module library.pyjamas.ui.ChangeListener

 1  # Copyright (C) 2009, 2012 Luke Kenneth Casson Leighton <lkcl@lkcl.net> 
 2  # 
 3  # Licensed under the Apache License, Version 2.0 (the "License"); 
 4  # you may not use this file except in compliance with the License. 
 5  # You may obtain a copy of the License at 
 6  # 
 7  #     http://www.apache.org/licenses/LICENSE-2.0 
 8  # 
 9  # Unless required by applicable law or agreed to in writing, software 
10  # distributed under the License is distributed on an "AS IS" BASIS, 
11  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
12  # See the License for the specific language governing permissions and 
13  # limitations under the License. 
14   
15  from pyjamas import DOM 
16  from pyjamas.ui import Event 
17   
18   
19 -def fireChangeEvent(listeners, sender, event): 
20      etype = DOM.eventGetType(event) 
21      if etype != "change": 
22          return 
23      for listener in listeners: 
24          if hasattr(listener, 'onChange'): 
25              listener.onChange(sender) 
26          else: 
27              listener(sender) 
28   
29   
30 -class ChangeHandler(object): 
31   
32 -    def __init__(self): 
33   
34          self._changeListeners = [] 
35          self.sinkEvents(Event.ONCHANGE) 
36   
37 -    def onBrowserEvent(self, event): 
38          etype = DOM.eventGetType(event) 
39          if etype == 'change': 
40              fireChangeEvent(self._changeListeners, self, event) 
41   
42 -    def addChangeListener(self, listener): 
43          self._changeListeners.append(listener) 
44   
45 -    def removeChangeListener(self, listener): 
46          self._changeListeners.remove(listener) 
47   
48 -    def onChange(self, sender): 
49          pass 
50