Source Code for Module library.pyjamas.gmaps.Utils

  1  # Copyright (C) 2009 Daniel Carvalho <idnael@gmail.com> 
  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 JS 
 16   
 17   
 18  # Converts javascript structures from googlemaps javascript library to 
 19  # python structures, and vice-versa. 
 20  # 
 21  # Example: 
 22  # jsobj=JS("""[{nome:"danire", year:1814}, {nome:"joano", year:"1901"}]""") 
 23  # 
 24  # #print jsobj[0].nome  # this is an error! 
 25  # 
 26  # fields = dictToJs({"lista": 'l', "lista[]": 'd'}) 
 27  # pyobj=translateGmapsObject(jsobj,"lista",fields) 
 28  # for line in pyobj: 
 29  #   print line.nome, line.year 
 30  # 
 31  # jsobj2=translateGmapsObject(pyobj,"lista",fields,True) 
 32  # #jsobj2 is exactly the same as jsobj! 
 33   
 34   
 35 -def translateGmapsObject(obj, fieldName, fields, pyToJs): 
 36      JS(""" 
 37      //console['log']("translateGmapsObject " + fieldNameXXX+"("+pyToJs+")") 
 38   
 39      if (! (@{{fieldName}} in @{{fields}})) 
 40      { 
 41        //console['log']("nothing") 
 42        return @{{obj}}; 
 43      } 
 44      else{ 
 45          @{{action}} = @{{fields}}[@{{fieldName}}] 
 46          //console['log']("action=" + action) 
 47   
 48          if (@{{action}} == 'd') 
 49          { 
 50            //console['log']("is dict") 
 51            // this newobj can be used in js and also in python, 
 52            // like this "newobj['field']" 
 53            var newobj = {} 
 54            for (var i in @{{obj}}) 
 55               // vai ficar disponivel como uma propriedade, no python! 
 56               newobj[i] = $m['translateGmapsObject'](@{{obj}}[i], i, @{{fields}}, @{{pyToJs}}); 
 57            return newobj 
 58   
 59          } 
 60          else if (@{{action}} == 'l') 
 61          { 
 62            if (@{{pyToJs}}) { 
 63                var newobj = $m['listToJs'](@{{obj}}) 
 64                //console['log']("is list py->js") 
 65                for (var i in newobj){ 
 66                   newobj[i]=$m['translateGmapsObject']( 
 67                      newobj[i], @{{fieldName}} + "[]", @{{fields}},@{{pyToJs}} ) ; 
 68                } 
 69                return newobj 
 70            }else{ 
 71                //console['log']("is list js->py") 
 72                var newobj = @{{list}}([]) 
 73                for (var i in @{{obj}}) 
 74                   newobj['append']($m['translateGmapsObject']( 
 75                       @{{obj}}[i], @{{fieldName}} + "[]", @{{fields}},@{{pyToJs}} )); 
 76                return newobj 
 77            } 
 78          } 
 79          else 
 80          { 
 81            //console['log']("is special") 
 82            return @{{action}}(@{{obj}}) 
 83          } 
 84      } 
 85      """) 
 86   
 87   
 88  # converts a python dict to js 
 89  # It can be used in python functions that have variable number of args 
 90  # 
 91  # like 
 92  # def MapOptions(**params): 
 93  #     return dictToJs(params) 
 94  # 
 95  # if MapOptions is called without arguments, the for loop will 
 96  # raise an exception. 
 97  # I could use the test "if params" BUT it always gives True... 
 98  # So I have to catch the exception. 
 99   
100   
101 -def dictToJs(dict): 
102      obj = JS("{}") 
103      try: 
104          for key in dict: 
105              value = dict[key] 
106              JS("@{{obj}}[@{{key}}] = @{{value}}") 
107      except: 
108          pass 
109   
110      return obj 
111   
112   
113  # Converts a python list to a javascript list 
114 -def listToJs(list): 
115      obj = JS("[]") 
116      for i in list: 
117          obj.push(i) 
118      return obj 
119   
120   
121  # LISTENERS 
122   
123  # This functions add python listener methods to any 
124  # gmaps javascript object 
125   
126   
127 -def createListenerMethods(obj): 
128      obj.addListener = __addListener 
129      obj.removeListener = __removeListener 
130      obj.clearListeners = __clearListeners 
131      obj.clearInstanceListeners = __clearInstanceListeners 
132   
133      #obj.dumpListeners = __dumpListeners # para debug 
134   
135      obj.__listeners = {} #__ ! 
136   
137   
138 -def __dumpListeners(): 
139      self = JS("this") 
140      print "DUMP" 
141      for eventName in self.__listeners: 
142          print "  " + eventName 
143          for list in self.__listeners[eventName]: 
144              print "    " + str(list) 
145   
146   
147 -def __addListener(eventName, callback): 
148      self = JS("this") 
149   
150      thelist = JS(""" 
151         $wnd['google']['maps']['event']['addListener'](this, @{{eventName}}, function(event) { 
152           @{{callback}}(event); 
153         }) 
154      """) 
155   
156      # I have to keep information about the registered listeners for 
157      # this instance! 
158   
159      if eventName in self.__listeners: 
160          self.__listeners[eventName].append(thelist) 
161      else: 
162          self.__listeners[eventName] = [thelist] 
163   
164      return thelist 
165   
166   
167 -def __removeListener(list): 
168      self = JS("this") 
169   
170      for eventName in self.__listeners: 
171          if list in self.__listeners[eventName]: 
172              JS("""$wnd['google']['maps']['event']['removeListener'](@{{list}});""") 
173              self.__listeners[eventName].remove(list) 
174              return 
175      # if we get here, there is nothing to remove, 
176      # the listener specified doesn't exist or does not belong to this object 
177   
178   
179 -def __clearListeners(eventName): 
180      self = JS("this") 
181   
182      JS("""$wnd['google']['maps']['event']['clearListeners'](this, @{{eventName}})""") 
183      if eventName in self.__listeners: 
184          del self.__listeners[eventName] 
185   
186   
187 -def __clearInstanceListeners(): 
188      self = JS("this") 
189   
190      JS("""$wnd['google']['maps']['event']['clearInstanceListeners'](this)""") 
191      self.__listeners = {} 
192