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# ------------------------------------------------------------------------------
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# Copyright (c) 2008, Riverbank Computing Limited
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# All rights reserved.
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#
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# This software is provided without warranty under the terms of the BSD license.
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# However, when used with the GPL version of PyQt the additional terms
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# described in the PyQt GPL exception also apply
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#
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# Author: Riverbank Computing Limited
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# ------------------------------------------------------------------------------
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""" Defines a drop target editor for the PyQt user interface toolkit. A drop
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target editor handles drag and drop operations as a drop target.
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"""
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from pyface.qt import QtGui, QtCore
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# FIXME: ToolkitEditorFactory is a proxy class defined here just for backward
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# compatibility. The class has been moved to the
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# traitsui.editors.drop_editor file.
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from traitsui.editors.drop_editor import ToolkitEditorFactory
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from .editor import Editor as _BaseEditor
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from .text_editor import SimpleEditor as Editor
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from .constants import DropColor
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from .clipboard import PyMimeData, clipboard
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class SimpleEditor(Editor):
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""" Simple style of drop editor, which displays a read-only text field that
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contains the string representation of the object trait's value.
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"""
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#: Background color when it is OK to drop objects.
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ok_color = DropColor
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def init(self, parent):
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""" Finishes initializing the editor by creating the underlying toolkit
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widget.
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"""
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if self.factory.readonly:
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self.control = QtGui.QLineEdit(self.str_value)
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self.control.setReadOnly(True)
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self.set_tooltip()
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else:
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super(SimpleEditor, self).init(parent)
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pal = QtGui.QPalette(self.control.palette())
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pal.setColor(QtGui.QPalette.Base, self.ok_color)
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self.control.setPalette(pal)
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# Install EventFilter on control to handle DND events.
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drop_event_filter = _DropEventFilter(self.control)
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self.control.installEventFilter(drop_event_filter)
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self.control._qt4_editor = self
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def dispose(self):
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""" Disposes of the content of an editor.
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"""
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if self.factory.readonly:
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# enthought/traitsui#884
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_BaseEditor.dispose(self)
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else:
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super(SimpleEditor, self).dispose()
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def string_value(self, value):
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""" Returns the text representation of a specified object trait value.
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"""
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if value is None:
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return ""
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return str(value)
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def error(self, excp):
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""" Handles an error that occurs while setting the object's trait value.
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"""
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pass
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class _DropEventFilter(QtCore.QObject):
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def eventFilter(self, source, event):
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typ = event.type()
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if typ == QtCore.QEvent.Drop:
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self.dropEvent(event)
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elif typ == QtCore.QEvent.DragEnter:
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self.dragEnterEvent(event)
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return super(_DropEventFilter, self).eventFilter(source, event)
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def dropEvent(self, e):
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""" Handles a Python object being dropped on the tree.
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"""
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editor = self.parent()._qt4_editor
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klass = editor.factory.klass
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if editor.factory.binding:
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value = getattr(clipboard, "node", None)
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else:
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value = e.mimeData().instance()
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if (klass is None) or isinstance(value, klass):
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editor._no_update = True
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try:
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if hasattr(value, "drop_editor_value"):
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editor.value = value.drop_editor_value()
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else:
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editor.value = value
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if hasattr(value, "drop_editor_update"):
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value.drop_editor_update(self)
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else:
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self.setText(editor.str_value)
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finally:
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editor._no_update = False
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e.acceptProposedAction()
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def dragEnterEvent(self, e):
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""" Handles a Python object being dragged over the tree.
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"""
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editor = self.parent()._qt4_editor
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if editor.factory.binding:
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data = getattr(clipboard, "node", None)
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else:
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md = e.mimeData()
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if not isinstance(md, PyMimeData):
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return
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data = md.instance()
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try:
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editor.object.base_trait(editor.name).validate(
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editor.object, editor.name, data
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)
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e.acceptProposedAction()
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except:
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pass
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# Define the Text and ReadonlyEditor for use by the editor factory.
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TextEditor = ReadonlyEditor = SimpleEditor
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