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