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"""
allows multiple selection in a large list
Contact : marco@opengis.ch
.. note:: This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
"""
__author__ = 'marco@opengis.ch'
__revision__ = '$Format:%H$'
__date__ = '9/07/2013'
from qgis.PyQt.QtWidgets import (QGroupBox,
QListWidget,
QPushButton,
QSizePolicy,
QLabel,
QHBoxLayout,
QVBoxLayout,
QListWidget,
QAbstractItemView)
from qgis.PyQt.QtGui import QFont
from qgis.PyQt.QtCore import Qt, QSize, pyqtSignal
class ListMultiSelectWidget(QGroupBox):
"""Widget to show two parallel lists and move elements between the two
usage from code:
self.myWidget = ListMultiSelectWidget(title='myTitle')
self.myLayout.insertWidget(1, self.myWidget)
usage from designer:
insert a QGroupBox in your UI file
optionally give a title to the QGroupBox
promote it to ListMultiSelectWidget
"""
selection_changed = pyqtSignal()
def __init__(self, parent=None, title=None):
QGroupBox.__init__(self)
self.setTitle(title)
self.selected_widget = None
self.unselected_widget = None
self._setupUI()
# connect actions
self.select_all_btn.clicked.connect(self._select_all)
self.deselect_all_btn.clicked.connect(self._deselect_all)
self.select_btn.clicked.connect(self._select)
self.deselect_btn.clicked.connect(self._deselect)
self.unselected_widget.itemDoubleClicked.connect(self._select)
self.selected_widget.itemDoubleClicked.connect(self._deselect)
def get_selected_items(self):
"""
:return list with all the selected items text
"""
return self._get_items(self.selected_widget)
def get_unselected_items(self):
"""
:return list with all the unselected items text
"""
return self._get_items(self.unselected_widget)
def add_selected_items(self, items):
"""
:param items list of strings to be added in the selected list
"""
self._add_items(self.selected_widget, items)
def add_unselected_items(self, items):
"""
:param items list of strings to be added in the unselected list
"""
self._add_items(self.unselected_widget, items)
def set_selected_items(self, items):
"""
:param items list of strings to be set as the selected list
"""
self._set_items(self.selected_widget, items)
def set_unselected_items(self, items):
"""
:param items list of strings to be set as the unselected list
"""
self._set_items(self.unselected_widget, items)
def clear(self):
"""
removes all items from selected and unselected
"""
self.set_selected_items([])
self.set_unselected_items([])
def addItem(self, item):
"""
This is for Processing
:param item: string to be added in the unselected list
"""
self.add_unselected_items([item])
def addItems(self, items):
"""
This is for Processing
:param items: list of strings to be added in the unselected list
"""
self.add_unselected_items(items)
def _get_items(self, widget):
for i in range(widget.count()):
yield widget.item(i).text()
def _set_items(self, widget, items):
widget.clear()
self._add_items(widget, items)
def _add_items(self, widget, items):
widget.addItems(items)
def _select_all(self):
self.unselected_widget.selectAll()
self._do_move(self.unselected_widget, self.selected_widget)
def _deselect_all(self):
self.selected_widget.selectAll()
self._do_move(self.selected_widget, self.unselected_widget)
def _select(self):
self._do_move(self.unselected_widget, self.selected_widget)
def _deselect(self):
self._do_move(self.selected_widget, self.unselected_widget)
def _do_move(self, fromList, toList):
for item in fromList.selectedItems():
prev_from_item = fromList.item(fromList.row(item) - 1)
toList.addItem(fromList.takeItem(fromList.row(item)))
fromList.scrollToItem(prev_from_item)
self.selection_changed.emit()
def _setupUI(self):
self.setSizePolicy(
QSizePolicy.Preferred, QSizePolicy.Preferred)
self.setMinimumHeight(180)
self.main_horizontal_layout = QHBoxLayout(self)
italic_font = QFont()
italic_font.setItalic(True)
# unselected widget
self.unselected_widget = QListWidget(self)
self._set_list_widget_defaults(self.unselected_widget)
unselected_label = QLabel()
unselected_label.setText('Unselected')
unselected_label.setAlignment(Qt.AlignCenter)
unselected_label.setFont(italic_font)
unselected_v_layout = QVBoxLayout()
unselected_v_layout.addWidget(unselected_label)
unselected_v_layout.addWidget(self.unselected_widget)
# selected widget
self.selected_widget = QListWidget(self)
self._set_list_widget_defaults(self.selected_widget)
selected_label = QLabel()
selected_label.setText('Selected')
selected_label.setAlignment(Qt.AlignCenter)
selected_label.setFont(italic_font)
selected_v_layout = QVBoxLayout()
selected_v_layout.addWidget(selected_label)
selected_v_layout.addWidget(self.selected_widget)
# buttons
self.buttons_vertical_layout = QVBoxLayout()
self.buttons_vertical_layout.setContentsMargins(0, -1, 0, -1)
self.select_all_btn = SmallQPushButton('>>')
self.deselect_all_btn = SmallQPushButton('<<')
self.select_btn = SmallQPushButton('>')
self.deselect_btn = SmallQPushButton('<')
self.select_btn.setToolTip('Add the selected items')
self.deselect_btn.setToolTip('Remove the selected items')
self.select_all_btn.setToolTip('Add all')
self.deselect_all_btn.setToolTip('Remove all')
# add buttons
spacer_label = QLabel() # pragmatic way to create a spacer with
# the same height of the labels on top
# of the lists, in order to align the
# buttons with the lists.
self.buttons_vertical_layout.addWidget(spacer_label)
self.buttons_vertical_layout.addWidget(self.select_btn)
self.buttons_vertical_layout.addWidget(self.deselect_btn)
self.buttons_vertical_layout.addWidget(self.select_all_btn)
self.buttons_vertical_layout.addWidget(self.deselect_all_btn)
# add sub widgets
self.main_horizontal_layout.addLayout(unselected_v_layout)
self.main_horizontal_layout.addLayout(self.buttons_vertical_layout)
self.main_horizontal_layout.addLayout(selected_v_layout)
def _set_list_widget_defaults(self, widget):
widget.setAlternatingRowColors(True)
widget.setSortingEnabled(True)
widget.setDragEnabled(True)
widget.setDragDropMode(QAbstractItemView.DragDrop)
widget.setDragDropOverwriteMode(False)
widget.setDefaultDropAction(Qt.MoveAction)
widget.setSelectionMode(QAbstractItemView.MultiSelection)
class SmallQPushButton(QPushButton):
def __init__(self, text):
QPushButton.__init__(self)
self.setText(text)
buttons_size_policy = QSizePolicy(
QSizePolicy.Fixed, QSizePolicy.Fixed)
self.setSizePolicy(buttons_size_policy)
self.setMaximumSize(QSize(30, 30))
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