/usr/lib/python2.7/dist-packages/traitsui/qt4/drop_editor.py is in python-traitsui 4.4.0-1.3.
This file is owned by root:root, with mode 0o644.
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# Copyright (c) 2008, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD license.
# However, when used with the GPL version of PyQt the additional terms described in the PyQt GPL exception also apply
#
# Author: Riverbank Computing Limited
#------------------------------------------------------------------------------
""" Defines a drop target editor for the PyQt user interface toolkit. A drop
target editor handles drag and drop operations as a drop target.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from pyface.qt import QtGui, QtCore
# FIXME: ToolkitEditorFactory is a proxy class defined here just for backward
# compatibility. The class has been moved to the
# traitsui.editors.drop_editor file.
from traitsui.editors.drop_editor import ToolkitEditorFactory
from text_editor import SimpleEditor as Editor
from constants import DropColor
from clipboard import PyMimeData, clipboard
#-------------------------------------------------------------------------------
# 'SimpleEditor' class:
#-------------------------------------------------------------------------------
class SimpleEditor ( Editor ):
""" Simple style of drop editor, which displays a read-only text field that
contains the string representation of the object trait's value.
"""
# Background color when it is OK to drop objects.
ok_color = DropColor
#---------------------------------------------------------------------------
# Finishes initializing the editor by creating the underlying toolkit
# widget:
#---------------------------------------------------------------------------
def init ( self, parent ):
""" Finishes initializing the editor by creating the underlying toolkit
widget.
"""
if self.factory.readonly:
self.control = QtGui.QLineEdit(self.str_value)
self.control.setReadOnly(True)
self.set_tooltip()
else:
super( SimpleEditor, self ).init( parent )
pal = QtGui.QPalette(self.control.palette())
pal.setColor(QtGui.QPalette.Base, self.ok_color)
self.control.setPalette(pal)
# Install EventFilter on control to handle DND events.
drop_event_filter = _DropEventFilter(self.control)
self.control.installEventFilter(drop_event_filter)
self.control._qt4_editor = self
#---------------------------------------------------------------------------
# Returns the text representation of a specified object trait value:
#---------------------------------------------------------------------------
def string_value ( self, value ):
""" Returns the text representation of a specified object trait value.
"""
if value is None:
return ''
return str( value )
#---------------------------------------------------------------------------
# Handles an error that occurs while setting the object's trait value:
#---------------------------------------------------------------------------
def error ( self, excp ):
""" Handles an error that occurs while setting the object's trait value.
"""
pass
class _DropEventFilter(QtCore.QObject):
def eventFilter(self, source, event):
typ = event.type()
if typ == QtCore.QEvent.Drop:
self.dropEvent(event)
elif typ == QtCore.QEvent.DragEnter:
self.dragEnterEvent(event)
return super(_DropEventFilter, self).eventFilter(source, event)
#---------------------------------------------------------------------------
# Handles a Python object being dropped on the control:
#---------------------------------------------------------------------------
def dropEvent(self, e):
""" Handles a Python object being dropped on the tree.
"""
editor = self.parent()._qt4_editor
klass = editor.factory.klass
if editor.factory.binding:
value = getattr(clipboard, 'node', None)
else:
value = e.mimeData().instance()
if (klass is None) or isinstance(value, klass):
editor._no_update = True
try:
if hasattr( value, 'drop_editor_value' ):
editor.value = value.drop_editor_value()
else:
editor.value = value
if hasattr( value, 'drop_editor_update' ):
value.drop_editor_update(self)
else:
self.setText(editor.str_value)
finally:
editor._no_update = False
e.acceptProposedAction()
#---------------------------------------------------------------------------
# Handles a Python object being dragged over the control:
#---------------------------------------------------------------------------
def dragEnterEvent(self, e):
""" Handles a Python object being dragged over the tree.
"""
editor = self.parent()._qt4_editor
if editor.factory.binding:
data = getattr(clipboard, 'node', None)
else:
md = e.mimeData()
if not isinstance(md, PyMimeData):
return
data = md.instance()
try:
editor.object.base_trait(editor.name).validate(editor.object,
editor.name, data)
e.acceptProposedAction()
except:
pass
# Define the Text and ReadonlyEditor for use by the editor factory.
TextEditor = ReadonlyEditor = SimpleEditor
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