问题
hi i've tried all i can think of and had looked at hundreds of stack overflow questions about tables and delegate's, and scratched my head for hours looking at the documentation trying to understand the c++ language and i have not read anything clearly stating that there's limits to the of amount delegate's a table view can take and not take, now i hope i can say i've got a firm understanding of the basic's in pyside2 and pyqt5 especially with tables and models but the delegates is a bit mind boggling, i've gotten this far based on people's questions mostly from stack overflow so this is my first attempt to ask any help..
import pandas as pd
from PySide2 import QtWidgets
from PySide2.QtCore import (Qt, QAbstractTableModel, QModelIndex, QEvent, QPersistentModelIndex,
QSortFilterProxyModel,
QTimer, Slot)
from PySide2.QtWidgets import QTableView, QAbstractItemView, QComboBox, QItemDelegate
class ScheduleModel(QAbstractTableModel):
def __init__(self, schedules_list=None, parent=None):
super(ScheduleModel, self).__init__(parent)
if schedules_list is None:
self.schedules_list = []
else:
self.schedules_list = schedules_list
def rowCount(self, index=QModelIndex()):
return self.schedules_list.shape[0]
def columnCount(self, index=QModelIndex()):
return self.schedules_list.shape[1]
def data(self, index, role=Qt.DisplayRole):
col = index.column()
if index.isValid():
if role == Qt.DisplayRole:
value = self.schedules_list.iloc[index.row(), index.column()]
return str(self.schedules_list.iloc[index.row(), index.column()])
return None
def headerData(self, section, orientation, role):
# section is the index of the column/row.
if orientation == Qt.Horizontal and role == Qt.DisplayRole:
return self.schedules_list.columns[section]
if orientation == Qt.Vertical:
return str(self.schedules_list.index[section])
def setData(self, index, value, role=Qt.EditRole):
if role != Qt.EditRole:
return False
if index.isValid() and 0 <= index.row() < len(self.schedules_list):
self.schedules_list.iloc[index.row(), index.column()] = value
if self.data(index, Qt.DisplayRole) == value:
self.dataChanged.emit(index, index, (Qt.EditRole,))
return True
return False
def flags(self, index):
if 1 <= index.column() <= 7:
return Qt.ItemIsEnabled | Qt.ItemIsSelectable | Qt.ItemIsEditable
if index.column() == 5:
return Qt.ItemIsEditable | Qt.ItemIsUserCheckable | Qt.ItemIsSelectable
elif index.column() == 1 and index.column() == 7:
return Qt.DecorationRole
else:
return Qt.ItemIsSelectable
class ClickDelegate(QtWidgets.QStyledItemDelegate):
blankText = '<Click here to add path>'
def openFileDialog(self, lineEdit):
if not self.blankText.startswith(lineEdit.text()):
currentPath = lineEdit.text()
else:
currentPath = ''
path, _ = QtWidgets.QFileDialog.getOpenFileName(lineEdit.window(),
'Select file', currentPath)
if path:
lineEdit.setText(path)
def createEditor(self, parent, option, index):
editor = QtWidgets.QWidget(parent)
layout = QtWidgets.QHBoxLayout(editor)
layout.setContentsMargins(0, 0, 0, 0)
layout.setSpacing(0)
editor.lineEdit = QtWidgets.QLineEdit(self.blankText)
layout.addWidget(editor.lineEdit)
editor.setFocusProxy(editor.lineEdit)
editor.lineEdit.installEventFilter(self)
button = QtWidgets.QToolButton(text='...')
layout.addWidget(button)
button.setFocusPolicy(Qt.NoFocus)
button.clicked.connect(lambda: self.openFileDialog(editor.lineEdit))
return editor
def setEditorData(self, editor, index):
if index.data():
editor.lineEdit.setText(str(index.data()))
editor.lineEdit.selectAll()
def setModelData(self, editor, model, index):
if not editor.lineEdit.text():
model.setData(index, None)
elif not self.blankText.startswith(editor.lineEdit.text()):
model.setData(index, editor.lineEdit.text())
def initStyleOption(self, option, index):
super(ClickDelegate, self).initStyleOption(option, index)
if not option.text:
option.text = self.blankText
def eventFilter(self, source, event):
if isinstance(source, QtWidgets.QLineEdit):
if (event.type() == QEvent.MouseButtonPress and
source.hasSelectedText() and
self.blankText.startswith(source.text())):
res = super(ClickDelegate, self).eventFilter(source, event)
source.clear()
return res
elif event.type() == QEvent.KeyPress and event.key() in (
Qt.Key_Escape, Qt.Key_Tab, Qt.Key_Backtab):
return False
return super(ClickDelegate, self).eventFilter(source, event)
def checkIndex(self, table, index):
if index in table.selectedIndexes() and index == table.currentIndex():
table.edit(index)
def editorEvent(self, event, model, option, index):
if (event.type() == QEvent.MouseButtonPress and
event.button() == Qt.LeftButton and
index in option.widget.selectedIndexes()):
table = option.widget
QTimer.singleShot(0, lambda: self.checkIndex(table, index))
return super(ClickDelegate, self).editorEvent(event, model, option, index)
class CheckBoxDelegate(QtWidgets.QItemDelegate):
"""
A delegate that places a fully functioning QCheckBox cell of the column to which it's applied.
"""
def __init__(self, parent):
QtWidgets.QItemDelegate.__init__(self, parent)
def createEditor(self, parent, option, index):
"""
Important, otherwise an editor is created if the user clicks in this cell.
"""
return None
def paint(self, painter, option, index):
"""
Paint a checkbox without the label.
"""
self.drawCheck(painter, option, option.rect,
Qt.Unchecked if int(index.data()) == 0 else Qt.Checked)
def editorEvent(self, event, model, option, index):
'''
Change the data in the model and the state of the checkbox
if the user presses the left mousebutton and this cell is editable. Otherwise do nothing.
'''
if not int(index.flags() and Qt.ItemIsEditable) > 0:
return False
if event.type() == QEvent.MouseButtonRelease and event.button() == Qt.LeftButton:
# Change the checkbox-state
self.setModelData(None, model, index)
return True
return False
def setModelData(self, editor, model, index):
'''
The user wanted to change the old state in the opposite.
'''
model.setData(index, 1 if int(index.data()) == 0 else 0, Qt.EditRole)
class DoubleSpinBoxDelegate(QtWidgets.QStyledItemDelegate):
"""A delegate class displaying a double spin box."""
def __init__(self, parent=None, minimum=0.0, maximum=100.0, step=0.01):
QtWidgets.QStyledItemDelegate.__init__(self, parent)
self._min = minimum
self._max = maximum
self._step = step
def createEditor(self, parent, option, index):
editor = QtWidgets.QDoubleSpinBox(parent)
editor.setMinimum(self._min)
editor.setMaximum(self._max)
editor.setSingleStep(self._step)
editor.setAccelerated(True)
editor.installEventFilter(self)
return editor
def setEditorData(self, spinBox, index):
value = float(index.model().data(index, Qt.DisplayRole))
spinBox.setValue(value)
def setModelData(self, spinBox, model, index):
value = spinBox.value()
model.setData(index, value)
def updateEditorGeometry(self, editor, option, index):
editor.setGeometry(option.rect)
class ComboBoxDelegate(QItemDelegate):
def __init__(self, parent=None):
super(ComboBoxDelegate, self).__init__(parent)
self.items = []
def setItems(self, items):
self.items = items
def createEditor(self, parent, option, index):
combo = QComboBox(parent)
li = []
for item in self.items:
li.append(item)
combo.addItems(li)
combo.currentIndexChanged.connect(self.currentIndexChanged)
return combo
def setEditorData(self, editor, index):
editor.blockSignals(True)
text = index.model().data(index, Qt.DisplayRole)
try:
i = self.items.index(text)
except ValueError:
i = 0
editor.setCurrentIndex(i)
def setModelData(self, editor, model, index):
# model.setData(index, editor.currentIndex(), Qt.EditRole)
model.setData(index, editor.currentText())
def updateEditorGeometry(self, editor, option, index):
editor.setGeometry(option.rect)
@Slot()
def currentIndexChanged(self):
self.commitData.emit(self.sender())
class SchedulesViewer(QTableView):
# selectionChanged = Signal(QItemSelection)
# data_changed = Signal(QModelIndex, QModelIndex)
def __init__(self, parent=None):
QTableView.__init__(self, parent)
# self.setContextMenuPolicy(Qt.CustomContextMenu)
# self.customContextMenuRequested.connect(self.schedule_context_menu)
address = {'idx': '1',
'presets': 'presets',
'selected_source': 'get_source',
'selected_destinations': 'selected_destinations',
'interval': '0400',
'active': '1',
'priority': 'high',
'categories': 'programming',
'last_total': '222',
}
self.schedule_model = ScheduleModel(pd.DataFrame([address]))
self.proxyModel = QSortFilterProxyModel(self)
self.proxyModel.setSourceModel(self.schedule_model)
self.proxyModel.setDynamicSortFilter(True)
self.setModel(self.proxyModel)
**"""
HAVING LIMITS TO THE AMOUNT OF WIDGETS TABLE VIEW CAN HANDEL
"""
dialog_delegate = ClickDelegate(self)
self.setItemDelegateForColumn(2, dialog_delegate)
self.setItemDelegateForColumn(3, dialog_delegate)
# spin_delegate = DoubleSpinBoxDelegate()
# self.setItemDelegateForColumn(4, spin_delegate)
# CheckBox = CheckBoxDelegate(None)
# self.setItemDelegateForColumn(5, CheckBox)
data = ['programming', 'game_build', 'other']
combo_delegate = ComboBoxDelegate()
combo_delegate.setItems([str(row) for row in data])
self.setItemDelegateForColumn(6, combo_delegate)**
self.setSortingEnabled(True)
self.setSelectionBehavior(QAbstractItemView.SelectRows)
self.horizontalHeader().setStretchLastSection(True)
self.verticalHeader().hide()
self.setSelectionMode(QAbstractItemView.SingleSelection)
self.proxyModel.sort(0, Qt.AscendingOrder)
self.setSelectionBehavior(QAbstractItemView.SelectRows)
self.setEditTriggers(QAbstractItemView.DoubleClicked)
self.setSelectionMode(QAbstractItemView.SingleSelection)
# self.selectionModel().selectionChanged.connect(self.selectionChanged)
self.show()
if __name__ == "__main__":
import sys
from PySide2.QtWidgets import QApplication
app = QApplication(sys.argv)
addressWidget = SchedulesViewer()
addressWidget.show()
sys.exit(app.exec_())
so please would someone help me understand what i'am i missing or not understanding, all that i want to achieve is to add the delegate's that have been hashed out and make it a editable table, but if i add either the spinbox or the checkbox delegate the app freezes and crashes so is there a limit as to how many delegate's the table view can handle or what i'am i doing wrong? Any help would be much appreciated please and thank you in advance..
回答1:
Thanks to musicamante that pointed out so freindly my simple mistake of overlooking the obvious of the too self's missing to make all the delegates members of the instance and i have tested and it works so here is the code..
import pandas as pd
from PySide2 import QtWidgets
from PySide2.QtCore import (Qt, QAbstractTableModel, QModelIndex, QEvent,
QPersistentModelIndex,
QSortFilterProxyModel,
QTimer, Slot)
from PySide2.QtWidgets import QTableView, QAbstractItemView, QComboBox, QItemDelegate
class ScheduleModel(QAbstractTableModel):
def __init__(self, schedules_list=None, parent=None):
super(ScheduleModel, self).__init__(parent)
if schedules_list is None:
self.schedules_list = []
else:
self.schedules_list = schedules_list
def rowCount(self, index=QModelIndex()):
return self.schedules_list.shape[0]
def columnCount(self, index=QModelIndex()):
return self.schedules_list.shape[1]
def data(self, index, role=Qt.DisplayRole):
col = index.column()
if index.isValid():
if role == Qt.DisplayRole:
value = self.schedules_list.iloc[index.row(), index.column()]
return str(self.schedules_list.iloc[index.row(), index.column()])
return None
def headerData(self, section, orientation, role):
# section is the index of the column/row.
if orientation == Qt.Horizontal and role == Qt.DisplayRole:
return self.schedules_list.columns[section]
if orientation == Qt.Vertical:
return str(self.schedules_list.index[section])
def setData(self, index, value, role=Qt.EditRole):
if role != Qt.EditRole:
return False
if index.isValid() and 0 <= index.row() < len(self.schedules_list):
self.schedules_list.iloc[index.row(), index.column()] = value
if self.data(index, Qt.DisplayRole) == value:
self.dataChanged.emit(index, index, (Qt.EditRole,))
return True
return False
def flags(self, index):
if 1 <= index.column() <= 7:
return Qt.ItemIsEnabled | Qt.ItemIsSelectable | Qt.ItemIsEditable
if index.column() == 5:
return Qt.ItemIsEditable | Qt.ItemIsUserCheckable | Qt.ItemIsSelectable
elif index.column() == 1 and index.column() == 7:
return Qt.DecorationRole
else:
return Qt.ItemIsSelectable
class ClickDelegate(QtWidgets.QStyledItemDelegate):
blankText = '<Click here to add path>'
def openFileDialog(self, lineEdit):
if not self.blankText.startswith(lineEdit.text()):
currentPath = lineEdit.text()
else:
currentPath = ''
path, _ = QtWidgets.QFileDialog.getOpenFileName(lineEdit.window(),
'Select file', currentPath)
if path:
lineEdit.setText(path)
def createEditor(self, parent, option, index):
editor = QtWidgets.QWidget(parent)
layout = QtWidgets.QHBoxLayout(editor)
layout.setContentsMargins(0, 0, 0, 0)
layout.setSpacing(0)
editor.lineEdit = QtWidgets.QLineEdit(self.blankText)
layout.addWidget(editor.lineEdit)
editor.setFocusProxy(editor.lineEdit)
editor.lineEdit.installEventFilter(self)
button = QtWidgets.QToolButton(text='...')
layout.addWidget(button)
button.setFocusPolicy(Qt.NoFocus)
button.clicked.connect(lambda: self.openFileDialog(editor.lineEdit))
return editor
def setEditorData(self, editor, index):
if index.data():
editor.lineEdit.setText(str(index.data()))
editor.lineEdit.selectAll()
def setModelData(self, editor, model, index):
if not editor.lineEdit.text():
model.setData(index, None)
elif not self.blankText.startswith(editor.lineEdit.text()):
model.setData(index, editor.lineEdit.text())
def initStyleOption(self, option, index):
super(ClickDelegate, self).initStyleOption(option, index)
if not option.text:
option.text = self.blankText
def eventFilter(self, source, event):
if isinstance(source, QtWidgets.QLineEdit):
if (event.type() == QEvent.MouseButtonPress and
source.hasSelectedText() and
self.blankText.startswith(source.text())):
res = super(ClickDelegate, self).eventFilter(source, event)
source.clear()
return res
elif event.type() == QEvent.KeyPress and event.key() in (
Qt.Key_Escape, Qt.Key_Tab, Qt.Key_Backtab):
return False
return super(ClickDelegate, self).eventFilter(source, event)
def checkIndex(self, table, index):
if index in table.selectedIndexes() and index == table.currentIndex():
table.edit(index)
def editorEvent(self, event, model, option, index):
if (event.type() == QEvent.MouseButtonPress and
event.button() == Qt.LeftButton and
index in option.widget.selectedIndexes()):
table = option.widget
QTimer.singleShot(0, lambda: self.checkIndex(table, index))
return super(ClickDelegate, self).editorEvent(event, model, option, index)
class CheckBoxDelegate(QtWidgets.QItemDelegate):
"""
A delegate that places a fully functioning QCheckBox cell of the column to which
it's applied.
"""
def __init__(self, parent):
QtWidgets.QItemDelegate.__init__(self, parent)
def createEditor(self, parent, option, index):
"""
Important, otherwise an editor is created if the user clicks in this cell.
"""
return None
def paint(self, painter, option, index):
"""
Paint a checkbox without the label.
"""
self.drawCheck(painter, option, option.rect,
Qt.Unchecked if int(index.data()) == 0 else Qt.Checked)
def editorEvent(self, event, model, option, index):
'''
Change the data in the model and the state of the checkbox
if the user presses the left mousebutton and this cell is editable. Otherwise
do nothing.
'''
if not int(index.flags() and Qt.ItemIsEditable) > 0:
return False
if event.type() == QEvent.MouseButtonRelease and event.button() ==
Qt.LeftButton:
# Change the checkbox-state
self.setModelData(None, model, index)
return True
return False
def setModelData(self, editor, model, index):
'''
The user wanted to change the old state in the opposite.
'''
model.setData(index, 1 if int(index.data()) == 0 else 0, Qt.EditRole)
class DoubleSpinBoxDelegate(QtWidgets.QStyledItemDelegate):
"""A delegate class displaying a double spin box."""
def __init__(self, parent=None, minimum=0.0, maximum=100.0, step=0.01):
QtWidgets.QStyledItemDelegate.__init__(self, parent)
self._min = minimum
self._max = maximum
self._step = step
def createEditor(self, parent, option, index):
editor = QtWidgets.QDoubleSpinBox(parent)
editor.setMinimum(self._min)
editor.setMaximum(self._max)
editor.setSingleStep(self._step)
editor.setAccelerated(True)
editor.installEventFilter(self)
return editor
def setEditorData(self, spinBox, index):
value = float(index.model().data(index, Qt.DisplayRole))
spinBox.setValue(value)
def setModelData(self, spinBox, model, index):
value = spinBox.value()
model.setData(index, value)
def updateEditorGeometry(self, editor, option, index):
editor.setGeometry(option.rect)
class ComboBoxDelegate(QItemDelegate):
def __init__(self, parent=None):
super(ComboBoxDelegate, self).__init__(parent)
self.items = []
def setItems(self, items):
self.items = items
def createEditor(self, parent, option, index):
combo = QComboBox(parent)
li = []
for item in self.items:
li.append(item)
combo.addItems(li)
combo.currentIndexChanged.connect(self.currentIndexChanged)
return combo
def setEditorData(self, editor, index):
editor.blockSignals(True)
text = index.model().data(index, Qt.DisplayRole)
try:
i = self.items.index(text)
except ValueError:
i = 0
editor.setCurrentIndex(i)
def setModelData(self, editor, model, index):
# model.setData(index, editor.currentIndex(), Qt.EditRole)
model.setData(index, editor.currentText())
def updateEditorGeometry(self, editor, option, index):
editor.setGeometry(option.rect)
@Slot()
def currentIndexChanged(self):
self.commitData.emit(self.sender())
class SchedulesViewer(QTableView):
# selectionChanged = Signal(QItemSelection)
# data_changed = Signal(QModelIndex, QModelIndex)
def __init__(self, parent=None):
QTableView.__init__(self, parent)
# self.setContextMenuPolicy(Qt.CustomContextMenu)
# self.customContextMenuRequested.connect(self.schedule_context_menu)
address = {'idx': '1',
'presets': 'presets',
'selected_source': 'get_source',
'selected_destinations': 'selected_destinations',
'interval': '0400',
'active': '1',
'priority': 'high',
'categories': 'programming',
'last_total': '222',
}
self.schedule_model = ScheduleModel(pd.DataFrame([address]))
self.proxyModel = QSortFilterProxyModel(self)
self.proxyModel.setSourceModel(self.schedule_model)
self.proxyModel.setDynamicSortFilter(True)
self.setModel(self.proxyModel)
"""
HAVING LIMITS TO THE AMOUNT OF WIDGETS TABLE VIEW CAN HANDEL
"""
self.setItemDelegateForColumn(2, ClickDelegate(self))
self.setItemDelegateForColumn(3, ClickDelegate(self))
self.setItemDelegateForColumn(4, DoubleSpinBoxDelegate(self))
self.setItemDelegateForColumn(5, CheckBoxDelegate(self))
data = ['programming', 'game_build', 'other']
combo_delegate = ComboBoxDelegate(self)
combo_delegate.setItems([str(row) for row in data])
self.setItemDelegateForColumn(6, combo_delegate)
self.setSortingEnabled(True)
self.setSelectionBehavior(QAbstractItemView.SelectRows)
self.horizontalHeader().setStretchLastSection(True)
self.verticalHeader().hide()
self.setSelectionMode(QAbstractItemView.SingleSelection)
self.proxyModel.sort(0, Qt.AscendingOrder)
self.setSelectionBehavior(QAbstractItemView.SelectRows)
self.setEditTriggers(QAbstractItemView.DoubleClicked)
self.setSelectionMode(QAbstractItemView.SingleSelection)
# self.selectionModel().selectionChanged.connect(self.selectionChanged)
self.show()
if __name__ == "__main__":
import sys
from PySide2.QtWidgets import QApplication
app = QApplication(sys.argv)
addressWidget = SchedulesViewer()
addressWidget.show()
sys.exit(app.exec_())
来源：https://stackoverflow.com/questions/61663446/with-pyside2-and-qtableview-how-do-i-get-multiple-delegates-in-table-view-using