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#------------------------------------------------------------------------------
# Copyright (c) 2005, Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
# Thanks for using Enthought open source!
#
# Author: Enthought, Inc.
# Description: <Enthought util package component>
#------------------------------------------------------------------------------
#-------------------------------------------------------------------------------
#
# Provides a simple object for interacting with the system clipboard.
#
# Written by: David C. Morrill
#
# Date: 01/11/2005
#
# (c) Copyright 2005 by Enthought, Inc.
#
#-------------------------------------------------------------------------------
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
import wx
from cStringIO \
import StringIO
from cPickle \
import dumps, load, loads
from enthought.traits.api \
import HasStrictTraits, Property
#-------------------------------------------------------------------------------
# Constants:
#-------------------------------------------------------------------------------
# Data formats:
PythonObjectFormat = wx.CustomDataFormat( 'PythonObject' )
TextFormat = wx.DataFormat( wx.DF_TEXT )
FileFormat = wx.DataFormat( wx.DF_FILENAME )
# Shortcuts:
cb = wx.TheClipboard
is_supported = cb.IsSupported
# Standard sequence types:
SequenceTypes = ( list, tuple )
#-------------------------------------------------------------------------------
# 'Clipboard' class:
#-------------------------------------------------------------------------------
class Clipboard ( HasStrictTraits ):
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
data_type = Property # The type of data in the clipboard (string)
data = Property # Arbitrary Python data
has_data = Property # Arbitrary Python data is available
object_type = Property # Name of the class of object in the clipboard
object_data = Property # Python object data
has_object_data = Property # Python object data is available
text_data = Property # Text data
has_text_data = Property # Text data is available
file_data = Property # File name data
has_file_data = Property # File name data is available
#---------------------------------------------------------------------------
# 'data' property methods:
#---------------------------------------------------------------------------
def _get_data ( self ):
if self.has_text_data:
return self.text_data
if self.has_file_data:
return self.file_data
if self.has_object_data:
return self.object_data
return None
def _set_data ( self, data ):
if isinstance(data, basestring):
self.text_data = data
elif type( data ) in SequenceTypes:
self.file_data = data
else:
self.object_data = data
def _get_has_data ( self ):
result = False
if cb.Open():
result = (is_supported( TextFormat ) or
is_supported( FileFormat ) or
is_supported( PythonObjectFormat ))
cb.Close()
return result
def _get_data_type ( self ):
if self.has_text_data:
return 'str'
if self.has_file_data:
return 'file'
if self.has_object_data:
return self.object_type
return ''
#---------------------------------------------------------------------------
# 'object_data' property methods:
#---------------------------------------------------------------------------
def _get_object_data ( self ):
result = None
if cb.Open():
try:
if is_supported( PythonObjectFormat ):
cdo = wx.CustomDataObject( PythonObjectFormat )
if cb.GetData( cdo ):
file = StringIO( cdo.GetData() )
klass = load( file )
result = load( file )
finally:
cb.Close()
return result
def _set_object_data ( self, data ):
if cb.Open():
try:
cdo = wx.CustomDataObject( PythonObjectFormat )
cdo.SetData( dumps( data.__class__ ) + dumps( data ) )
# fixme: There seem to be cases where the '-1' value creates
# pickles that can't be unpickled (e.g. some TraitDictObject's)
#cdo.SetData( dumps( data, -1 ) )
cb.SetData( cdo )
finally:
cb.Close()
cb.Flush()
def _get_has_object_data ( self ):
return self._has_this_data( PythonObjectFormat )
def _get_object_type ( self ):
result = ''
if cb.Open():
try:
if is_supported( PythonObjectFormat ):
cdo = wx.CustomDataObject( PythonObjectFormat )
if cb.GetData( cdo ):
try:
# We may not be able to load the required class:
result = loads( cdo.GetData() )
except:
pass
finally:
cb.Close()
return result
#---------------------------------------------------------------------------
# 'text_data' property methods:
#---------------------------------------------------------------------------
def _get_text_data ( self ):
result = ''
if cb.Open():
if is_supported( TextFormat ):
tdo = wx.TextDataObject()
if cb.GetData( tdo ):
result = tdo.GetText()
cb.Close()
return result
def _set_text_data ( self, data ):
if cb.Open():
cb.SetData( wx.TextDataObject( str( data ) ) )
cb.Close()
cb.Flush()
def _get_has_text_data ( self ):
return self._has_this_data( TextFormat )
#---------------------------------------------------------------------------
# 'file_data' property methods:
#---------------------------------------------------------------------------
def _get_file_data ( self ):
result = []
if cb.Open():
if is_supported( FileFormat ):
tfo = wx.FileDataObject()
if cb.GetData( tfo ):
result = tfo.GetFilenames()
cb.Close()
return result
def _set__file_data ( self, data ):
if cb.Open():
tfo = wx.FileDataObject()
if isinstance(data, basestring):
tfo.AddFile( data )
else:
for filename in data:
tfo.AddFile( filename )
cb.SetData( tfo )
cb.Close()
cb.Flush()
def _get_has_file_data ( self ):
return self._has_this_data( FileFormat )
#---------------------------------------------------------------------------
# Private helper methods:
#---------------------------------------------------------------------------
def _has_this_data ( self, format ):
result = False
if cb.Open():
result = is_supported( format )
cb.Close()
return result
#-------------------------------------------------------------------------------
# Create a singleton instance for quick reference:
#-------------------------------------------------------------------------------
clipboard = Clipboard()
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