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#-------------------------------------------------------------------------------
#
# Copyright (c) 2009, 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: Evan Patterson
# Date: 08/05/2009
#
#-------------------------------------------------------------------------------
""" Defines the table model used by the tabular editor.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from pyface.qt import QtCore, QtGui
from traitsui.ui_traits import SequenceTypes
#-------------------------------------------------------------------------------
# Constants:
#-------------------------------------------------------------------------------
# MIME type for internal table drag/drop operations
mime_type = 'traits-ui-list-str-editor'
#-------------------------------------------------------------------------------
# 'ListStrModel' class:
#-------------------------------------------------------------------------------
class ListStrModel(QtCore.QAbstractListModel):
""" A model for lists of strings.
"""
def __init__(self, editor, parent=None):
""" Initialise the object.
"""
QtCore.QAbstractListModel.__init__(self, parent)
self._editor = editor
#---------------------------------------------------------------------------
# QAbstractItemModel interface:
#---------------------------------------------------------------------------
def rowCount(self, mi):
""" Reimplemented to return items in the list.
"""
editor = self._editor
return editor.adapter.len(editor.object, editor.name)
def data(self, mi, role):
""" Reimplemented to return the data.
"""
editor = self._editor
adapter = editor.adapter
index = mi.row()
if role == QtCore.Qt.DisplayRole or role == QtCore.Qt.EditRole:
if editor.is_auto_add(index):
text = adapter.get_default_text(editor.object, editor.name,
index)
else:
text = adapter.get_text(editor.object, editor.name, index)
if role == QtCore.Qt.DisplayRole and text == '':
# FIXME: This is a hack to make empty strings editable.
text = ' '
return text
elif role == QtCore.Qt.DecorationRole:
if editor.is_auto_add(index):
image = adapter.get_default_image(editor.object,
editor.name, index)
else:
image = adapter.get_image(editor.object, editor.name, index)
image = editor.get_image(image)
if image is not None:
return image
elif role == QtCore.Qt.BackgroundRole:
if editor.is_auto_add(index):
color = adapter.get_default_bg_color(editor.object, editor.name)
else:
color = adapter.get_bg_color(editor.object, editor.name, index)
if color is not None:
if isinstance(color, SequenceTypes):
q_color = QtGui.QColor(*color)
else:
q_color = QtGui.QColor(color)
return QtGui.QBrush(q_color)
elif role == QtCore.Qt.ForegroundRole:
if editor.is_auto_add(index):
color = adapter.get_default_text_color(editor.object,
editor.name)
else:
color = adapter.get_text_color(editor.object,
editor.name, index)
if color is not None:
if isinstance(color, SequenceTypes):
q_color = QtGui.QColor(*color)
else:
q_color = QtGui.QColor(color)
return QtGui.QBrush(q_color)
return None
def setData(self, mi, value, role):
""" Reimplmented to allow for modification of the object trait.
"""
editor = self._editor
editor.adapter.set_text(editor.object, editor.name, mi.row(), value)
signal = QtCore.SIGNAL('dataChanged(QModelIndex,QModelIndex)')
self.emit(signal, mi, mi)
return True
def setItemData(self, mi, roles):
""" Reimplmented to reject all setItemData calls.
"""
# FIXME: This is a hack to prevent the QListView from clearing out the
# old row after a move operation. (The QTableView doesn't do this, for
# some reason). This behavior is not overridable so far as I can tell,
# but there may be a better way around this issue. Note that we cannot
# simply use a CopyAction instead because InternalMove mode is hardcoded
# in the Qt source to allow only MoveActions.
return False
def flags(self, mi):
""" Reimplemented to set editable status and movable status.
"""
editor = self._editor
index = mi.row()
flags = QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEnabled
if (editor.factory.editable and 'edit' in editor.factory.operations and
editor.adapter.get_can_edit(editor.object, editor.name, index)):
flags |= QtCore.Qt.ItemIsEditable
if (editor.factory.editable and 'move' in editor.factory.operations and
editor.adapter.get_drag(editor.object, editor.name, index) is not None):
flags |= QtCore.Qt.ItemIsDragEnabled | QtCore.Qt.ItemIsDropEnabled
return flags
def headerData(self, section, orientation, role):
""" Reimplemented to return title for vertical header data.
"""
if orientation != QtCore.Qt.Horizontal or role != QtCore.Qt.DisplayRole:
return None
return self._editor.title
def insertRow(self, row, parent=QtCore.QModelIndex(), obj=None):
""" Reimplemented to allow creation of new rows. Added an optional
arg to allow the insertion of an existing row object.
"""
editor = self._editor
adapter = editor.adapter
if obj is None:
obj = adapter.get_default_value(editor.object, editor.name)
self.beginInsertRows(parent, row, row)
editor.callx(
editor.adapter.insert, editor.object, editor.name, row, obj)
self.endInsertRows()
return True
def insertRows(self, row, count, parent=QtCore.QModelIndex()):
""" Reimplemented to allow creation of new items.
"""
editor = self._editor
adapter = editor.adapter
self.beginInsertRows(parent, row, row + count - 1)
for i in xrange(count):
value = adapter.get_default_value(editor.object, editor.name)
editor.callx(adapter.insert, editor.object, editor.name, row, value)
self.endInsertRows()
return True
def removeRows(self, row, count, parent=QtCore.QModelIndex()):
""" Reimplemented to allow row deletion, as well as reordering via drag
and drop.
"""
editor = self._editor
adapter = editor.adapter
self.beginRemoveRows(parent, row, row + count - 1)
for i in xrange(count):
editor.callx(adapter.delete, editor.object, editor.name, row)
self.endRemoveRows()
return True
def mimeTypes(self):
""" Reimplemented to expose our internal MIME type for drag and drop
operations.
"""
return [mime_type]
def mimeData(self, indexes):
""" Reimplemented to generate MIME data containing the rows of the
current selection.
"""
mime_data = QtCore.QMimeData()
rows = list(set([ index.row() for index in indexes ]))
data = QtCore.QByteArray(str(rows[0]))
for row in rows[1:]:
data.append(' %i' % row)
mime_data.setData(mime_type, data)
return mime_data
def dropMimeData(self, mime_data, action, row, column, parent):
""" Reimplemented to allow items to be moved.
"""
if action == QtCore.Qt.IgnoreAction:
return False
data = mime_data.data(mime_type)
if data.isNull():
return False
current_rows = map(int, str(data).split(' '))
self.moveRows(current_rows, parent.row())
return True
def supportedDropActions(self):
""" Reimplemented to allow items to be moved.
"""
return QtCore.Qt.MoveAction
#---------------------------------------------------------------------------
# ListStrModel interface:
#---------------------------------------------------------------------------
def moveRow(self, old_row, new_row):
""" Convenience method to move a single row.
"""
return self.moveRows([old_row], new_row)
def moveRows(self, current_rows, new_row):
""" Moves a sequence of rows (provided as a list of row indexes) to a
new row.
"""
editor = self._editor
# Sort rows in descending order so they can be removed without
# invalidating the indices.
current_rows.sort()
current_rows.reverse()
# If the the highest selected row is lower than the destination, do an
# insertion before rather than after the destination.
if current_rows[-1] < new_row:
new_row += 1
# Remove selected rows...
objects = []
for row in current_rows:
if row <= new_row:
new_row -= 1
obj = editor.adapter.get_item(editor.object, editor.name, row)
objects.insert(0, obj)
self.removeRow(row)
# ...and add them at the new location.
for i, obj in enumerate(objects):
self.insertRow(new_row + i, obj=obj)
# Update the selection for the new location.
if editor.factory.multi_select:
editor.setx(multi_selected = objects)
editor.multi_selected_indices = range(new_row, new_row+len(objects))
else:
editor.setx(selected = objects[0])
editor.selected_index = new_row
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