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