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- #!/usr/bin/env python
- # -*- coding: utf-8 -*-
-
- # Sugar interface for Enyo JavaScript framework
-
- import logging
- import json
- import inspect
-
-
- class Enyo:
- """Class to handle communication with Enyo"""
-
- def __init__(self, webview):
- """Constructor: link to the WebKit widget"""
- self.webview = webview
- self.handlers = {}
- self.webview.connect("console-message", self._message_emitted)
-
- def connect(self, name, callback):
- """Add a new handler for an event"""
- self.handlers[name] = callback
-
- def send_message(self, name, args=None):
- """Send a message to Enyo"""
- script = "enyo.Sugar.sendMessage('"+name+"', "
- if not args is None:
- value = "'"+self.json_encode(args)+"'"
- else:
- value = "null"
- script = script+value+")"
- logging.warning("sugar://"+name+"/"+value)
- return self.webview.execute_script(script)
-
- def _message_emitted(self, widget, value, line, source):
- """Raised when a message from Enyo has been received"""
- # Only consider prefixed message
- prefix = "enyo://"
- if not value.startswith(prefix):
- return False
-
- # Get name
- prefixlen = len(prefix)
- size = value[prefixlen:prefixlen+value[prefixlen:].index("/")]
- start = prefixlen+1+len(size)
- name = value[start:start+int(size)]
-
- # Get param
- start = start + len(name)+1
- size = value[start:start+value[start:].index("/")]
- if int(size) == 0:
- args = None
- else:
- start = start+1+len(size)
- args = value[start:]
-
- # Call handler if exist
- logging.warning(value);
- if name in self.handlers:
- callback = self.handlers[name]
- if args:
- callback(json.loads(args))
- else:
- callback(None)
-
- return True
-
- def json_encode(self, obj):
- """Encode object as a JSON string"""
- try:
- result = json.dumps(obj)
- except TypeError:
- result = "{"
- first = True
- for name in dir(obj):
- value = getattr(obj, name)
- if not name.startswith('__') and not inspect.ismethod(value) and not inspect.isroutine(value) and not inspect.isbuiltin(value) and not isinstance(value, obj.__class__):
- if not first:
- result = result + ', '
- else:
- first = False
- result = result + '"'+name+'": '
- result = result + self.json_encode(value)
- result = result + "}"
- return result
-
- def json_decode(self, str):
- """Decode JSON string as object"""
- return json.loads(str)
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