Source Code for Module library.pyjamas.dnd.DataTransfer

  1  from pyjamas.Timer import Timer 
  2  from pyjamas.dnd.utils import cloneElement, DOMStringList 
  3   
  4  from pyjamas.dnd import READ_ONLY, READ_WRITE, PROTECTED, DISABLED 
  5   
  6 -def identity(obj): 
  7      return obj 
  8   
  9 -class DataTransferItem(object): 
 10      """ 
 11      this is an in-browser string-kind-only implementation. 
 12      see: http://http://dev.w3.org/html5/spec/dnd.html#datatransferitem 
 13      """ 
 14 -    def __init__(self, type, data): 
 15          self._type = type 
 16          self._data = data 
 17   
 18 -    def getType(self): 
 19          if self.mode == DISABLED: 
 20              return '' 
 21          return self._type 
 22      type = property(getType) 
 23   
 24 -    def getKind(self): 
 25          if self.mode == DISABLED: 
 26              return '' 
 27          return 'string' 
 28      kind = property(getKind) 
 29   
 30 -    def getMode(self): 
 31          return self._mode 
 32  #        return DISABLED 
 33   
 34 -    def setMode(self, mode): 
 35          self._mode = mode 
 36      mode = property(getMode, setMode) 
 37   
 38 -    def getAsString(self, callback=None): 
 39          if callback and self.kind == 'string': 
 40              if self.mode in [READ_WRITE, READ_ONLY]: 
 41                  callback(self._data) 
 42   
 43 -    def __str__(self): 
 44          return self._data 
 45   
 46 -class DataTransferItems(list): 
 47   
 48 -    def getMode(self): 
 49          return self._mode 
 50 -    def setMode(self, mode): 
 51          self._mode = mode 
 52          for item in self: 
 53              item.mode = mode 
 54      mode = property(getMode, setMode) 
 55   
 56  #   ack! length is a javascript keyword! Phoo! 
 57  #    def getLength(self): 
 58  #        if self.mode == DISABLED: 
 59  #            return 0 
 60  #        return self.__len__() 
 61  #    length = property(getLength) 
 62   
 63 -    def __delitem__(self, key): 
 64          if not self.mode == READ_WRITE: 
 65              raise Exception('Cannot delete item except in READ_WRITE mode.') 
 66          else: 
 67              list.__delitem__(self, key) 
 68   
 69 -    def __len__(self): 
 70          if self.mode == DISABLED: 
 71              return 0 
 72          return list.__len__(self) 
 73   
 74 -    def clear(self): 
 75          if self.mode == READ_WRITE: 
 76              while len(self): 
 77                  del self[-1] 
 78   
 79 -    def add(self, data, mime): 
 80          if self.mode == READ_WRITE: 
 81              item = DataTransferItem(mime.lower(), data) 
 82              self.append(item) 
 83              idx = self.index(item) 
 84              return self[idx] 
 85   
 86   
 87   
 88 -class DragDataStore(object): 
 89      _mode = PROTECTED 
 90 -    def __init__(self): 
 91          self.items = DataTransferItems() 
 92          self.default_feedback = None 
 93          self.elements = [] 
 94          self.bitmap = None 
 95          self.hotspot_coordinate = None 
 96          self.allowed_effects_state = 'uninitialized' 
 97   
 98 -    def setMode(self, mode): 
 99          if mode in [PROTECTED, READ_WRITE, READ_ONLY]: 
100              self._mode = mode 
101              self.items.mode = mode 
102   
103 -    def getMode(self): 
104          return self._mode 
105      mode = property(getMode, setMode) 
106   
107   
108 -class DataTransfer(object): 
109      """ 
110      DataTransfer implementation 
111      http://dev.w3.org/html5/spec/dnd.html#datatransfer 
112      """ 
113   
114 -    def __init__(self, dataStore): 
115          self.dataStore = dataStore 
116          self.setEffectAllowed(dataStore.allowed_effects_state) 
117          self._dropEffect = 'none' 
118          self._value = None 
119   
120 -    def acquireData(self, value): 
121          self._value = value 
122   
123 -    def setDropEffect(self, effect): 
124          if effect in ('none', 'copy', 'link' ,'move'): 
125              self._dropEffect = effect 
126   
127 -    def getDropEffect(self): 
128          return self._dropEffect 
129   
130      dropEffect = property(getDropEffect, setDropEffect) 
131   
132 -    def setEffectAllowed(self, effect): 
133          if effect in ('none', 'copy', 'copyLink', 'copyMove', 
134              'link', 'linkMove', 'move', 'all', 'uninitialized'): 
135              self._effectAllowed = effect 
136   
137 -    def getEffectAllowed(self): 
138          return self._effectAllowed 
139   
140      effectAllowed = property(getEffectAllowed, setEffectAllowed) 
141   
142 -    def setData(self, format, data): 
143          if self.dataStore.mode == READ_WRITE: 
144              format = format.strip().lower() 
145              if format == 'text': 
146                  format = 'text/plain' 
147              elif format == 'url': 
148                  format = 'text/uri-list' 
149              self.clearData(format) 
150              items = self.dataStore.items 
151              z = items.add(data, format) 
152              z.mode = READ_WRITE 
153   
154 -    def getTypes(self): 
155          theList = [] 
156          if self.dataStore is not None: 
157              items = self.dataStore.items 
158              for item in items: 
159                  theList.append(item.type) 
160          return DOMStringList(theList) 
161   
162      types = property(getTypes) 
163   
164 -    def getData(self, format): 
165          format = format.strip().lower() 
166          if format == 'text': 
167              format = 'text/plain' 
168          elif format == 'url': 
169              format = 'text/uri-list' 
170          theList = self.dataStore.items 
171          for item in theList: 
172              if item.type == format: 
173                  item.getAsString(self.acquireData) 
174                  return self._value 
175          return '' 
176   
177 -    def clearData(self, format=None): 
178          thelist = self.dataStore.items 
179          if self.dataStore is not None: 
180              if format is None: 
181                  thelist.clear() 
182              else: 
183                  format = format.lower() 
184                  to_del = [] 
185                  for idx, item in enumerate(thelist): 
186                      if item.type == format: 
187                          to_del.append(idx) 
188                  to_del.reverse() 
189                  for idx in to_del: 
190                      del thelist[idx] 
191   
192 -    def addElement(self, element): 
193          self.dataStore.elements.append(cloneElement(element)) 
194   
195 -    def setDragImage(self, element, x=0, y=0): 
196          self.dataStore.bitmap = element 
197          self.dataStore.hotspot_coordinate = (x, y, ) 
198