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| #!/usr/bin/env python3
# (pyqt5.15.2 / python3.9)
import sys
from PyQt5.QtGui import QStandardItemModel, QStandardItem
from PyQt5.QtCore import Qt, QModelIndex, QItemSelectionModel, QTimer
from PyQt5.QtWidgets import (
QMainWindow,
QApplication,
QListView,
QAbstractItemView,
)
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
elements = [
{'name' : 'bob', 'state' : True},
{'name' : 'alice', 'state' : True},
{'name' : 'marc', 'state' : False},
{'name' : 'eve', 'state' : True}
]
listeWdg = OrderNChooseWdg(elements)
self.setCentralWidget(listeWdg)
def keyPressEvent(self, e):
if e.key() == Qt.Key_Escape:
QApplication.quit()
class OrderNChooseWdg(QListView):
"""Permet d'ordonner une liste par glisser-déposer ou shift + flèches du clavier
**A la souris**::
mousePressEvent -> set_old_row -> obtention de l'"ancienne" ligne (self.old_row)
rowsInserted -> get_inserted_row (obtention de la nouvelle ligne (self.new_row)) -> update_selection -> met en surbrillance la ligne d'indice self.new_row
**Au clavier**::
keyPressEvent -> self.new_row = ancienne +/- 1 -> update_selection
L'utilisation des QTimer.singleShot permet de récupérer à posteriori
des valeurs modifiées par un événement (qui déclenche lui même le timer...)
"""
def __init__(self, elements):
super().__init__()
self.setDragDropMode(QAbstractItemView.InternalMove)
self.setDefaultDropAction(Qt.MoveAction)
self.setDragDropOverwriteMode(False)
self.setAcceptDrops(True)
self.setDropIndicatorShown(True)
self.setDragEnabled(True)
self.is_shift_pressed = False
self.old_row = -1000
self.model = QStandardItemModel(self)
self.model.rowsInserted.connect(self.get_inserted_row)
self.setModel(self.model)
self.setSelectionMode(QAbstractItemView.SingleSelection)
for elt in elements:
self.add_item(elt['name'], elt['state'])
###################### Au clavier ################################
def keyReleaseEvent(self, e):
if e.key() == Qt.Key_Shift:
self.is_shift_pressed = False
def keyPressEvent(self, e):
if e.key() == Qt.Key_Shift:
self.is_shift_pressed = True
# Move selected QStandardItem up or down in QListView
indexes = self.selectionModel().selectedIndexes()
if indexes:
row = indexes[0].row()
if self.is_shift_pressed:
if e.key() == Qt.Key_Up:
if row > 0:
item = self.model.takeRow(row)
self.model.insertRow(row-1, item)
self.new_row = row - 1
QTimer.singleShot(1, self.update_selection)
elif e.key() == Qt.Key_Down:
if row < self.model.rowCount() - 1:
item = self.model.takeRow(row)
self.model.insertRow(row+1, item)
self.new_row = row + 1
QTimer.singleShot(1, self.update_selection)
QListView.keyPressEvent(self, e)
################ A la souris ##########################
def get_inserted_row(self, parent, row_inserted, row_end):
"""Get row where item is inserted"""
self.new_row = row_inserted # save index to update selection
if self.old_row < self.new_row:
self.new_row += -1 # don't count current item, it will be removed
QTimer.singleShot(1, self.update_selection)
def mousePressEvent(self, e):
"""Trigger 'set_old_row' with a small delay so new selection is effective"""
# Save index (after small delay), in case of drag'n'drop
QTimer.singleShot(1, self.set_old_row)
QListView.mousePressEvent(self, e)
def set_old_row(self):
"""Save currently selected item row (on mouse event) before draging it"""
self.old_row = self.selectionModel().selectedIndexes()[0].row()
############## Mise à jour selection ##################################
def update_selection(self):
"""Highlight item that have been moved given its new row"""
index = self.model.index(self.new_row, 0)
self.selectionModel().setCurrentIndex(index, QItemSelectionModel.ClearAndSelect)
self.scrollTo(index)
########################## Autre ####################################
def add_item(self, name, state):
"""Fill list with values"""
item = QStandardItem(name)
item.setCheckable(True)
item.setCheckState(2*state)
item.setDragEnabled(True)
item.setDropEnabled(False)
item.setToolTip("Drag and drop to change tab order")
self.model.appendRow(item)
if __name__ == "__main__":
app = QApplication(sys.argv)
ex = MainWindow()
ex.show()
sys.exit(app.exec_()) |
