如何从 QListWidget、QTableWidget 将选定的项目保存到 Qsettings
How to save selected Items to Qsettings from QListWidget, QTableWidget
我正在使用 PyQt5 和 Py3.7，我正在尝试遍历我所有的 Qlistwidgets 并保存它们的字符串数据，同时也保存该小部件上的所有选定项目。我稍微修改了 here, but am having some trouble getting the selected items to save and restore using the listwidget array loop. I checked the docs but can't seem to understand how to add additional options into the array (such as save all selected items), from the Qt docs for SetArrayIndex, here.
的循环
我的 listWidgets 将 selectionMode 设置为 MultiSelection。
我目前正在使用这个来保存：
def save_list_data(self):
self.settings = QSettings("data.ini", QSettings.IniFormat)
for name, obj in inspect.getmembers(self):
if isinstance(obj, QListWidget):
name = obj.objectName()
self.settings.beginWriteArray(name)
for i in range(obj.count()):
self.settings.setArrayIndex(i)
self.settings.setValue(name, obj.item(i).text())
self.settings.endArray()
然后使用以下方法恢复 listWidget 数据：
def open_list_data(self):
self.settings = QSettings("data.ini", QSettings.IniFormat)
for name, obj in inspect.getmembers(self):
if isinstance(obj, QListWidget):
name = obj.objectName()
size = self.settings.beginReadArray(name)
for i in range(size):
self.settings.setArrayIndex(i)
value = self.settings.value(name)
if value != None:
obj.addItem(value)
self.settings.endArray()
这适用于数据，但我如何才能从 ListWidgets 中获取选定的项目以保存和恢复？
对于我的解决方案，请考虑以下因素：
使用 inspect 模块可能对其他库有益，但对于 Qt，小部件不一定是 class 的成员，因此最好使用 Qt 自省本身使用 findChildren .
在您使用的示例中，您只保存了文本，但 QListWidgetItem 可以包含更多与角色相关的信息，例如背景色、前景色等。所以我将使用 QDataStream运算符，因为此获取和保存获取项目信息。
我将使用 "objectname/property" 格式来保存信息，因为同一个小部件可以有多个您要保存的属性。
保存选中项的信息，只需要保存行即可。
综合以上，解决方案是：
from PyQt5 import QtCore, QtGui, QtWidgets
class Widget(QtWidgets.QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.listwidget_1 = QtWidgets.QListWidget(
objectName="listwidget_1",
selectionMode=QtWidgets.QAbstractItemView.MultiSelection
)
listwidget_2 = QtWidgets.QListWidget(
objectName="listwidget_2",
selectionMode=QtWidgets.QAbstractItemView.MultiSelection
)
lay = QtWidgets.QVBoxLayout(self)
lay.addWidget(self.listwidget_1)
lay.addWidget(listwidget_2)
self.read_settings()
def closeEvent(self, event):
self.write_settings()
super().closeEvent(event)
def read_settings(self):
settings = QtCore.QSettings("data.ini", QtCore.QSettings.IniFormat)
childrens = self.findChildren(QtWidgets.QWidget)
for children in childrens:
if isinstance(children, QtWidgets.QListWidget) and children.objectName():
settings.beginGroup(children.objectName())
items = settings.value("items")
selecteditems = settings.value("selecteditems")
selectionMode = settings.value("selectionMode", type=QtWidgets.QAbstractItemView.SelectionMode)
children.setSelectionMode(selectionMode)
# In the first reading the initial values must be established
if items is None:
if children.objectName() == "listwidget_1":
for i in range(10):
children.addItem(QtWidgets.QListWidgetItem(str(i)))
elif children.objectName() == "listwidget_2":
for i in "abcdefghijklmnopqrstuvwxyz":
children.addItem(QtWidgets.QListWidgetItem(i))
else:
stream = QtCore.QDataStream(items, QtCore.QIODevice.ReadOnly)
while not stream.atEnd():
it = QtWidgets.QListWidgetItem()
stream >> it
children.addItem(it)
stream = QtCore.QDataStream(selecteditems, QtCore.QIODevice.ReadOnly)
while not stream.atEnd():
row = stream.readInt()
it = children.item(row)
it.setSelected(True)
settings.endGroup()
def write_settings(self):
settings = QtCore.QSettings("data.ini", QtCore.QSettings.IniFormat)
childrens = self.findChildren(QtWidgets.QWidget)
for children in childrens:
if isinstance(children, QtWidgets.QListWidget) and children.objectName():
settings.beginGroup(children.objectName())
items = QtCore.QByteArray()
stream = QtCore.QDataStream(items, QtCore.QIODevice.WriteOnly)
for i in range(children.count()):
stream << children.item(i)
selecteditems = QtCore.QByteArray()
stream = QtCore.QDataStream(selecteditems, QtCore.QIODevice.WriteOnly)
for it in children.selectedItems():
stream.writeInt(children.row(it))
settings.setValue("items", items)
settings.setValue("selecteditems", selecteditems)
settings.setValue("selectionMode", children.selectionMode())
settings.endGroup()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
加上：
import contextlib
from PyQt5 import QtCore, QtGui, QtWidgets
class SettingsManager:
def __init__(self, filename):
self.m_settings = QtCore.QSettings(filename, QtCore.QSettings.IniFormat)
@property
def settings(self):
return self.m_settings
def read(self, widget):
self.settings.beginGroup(widget.objectName())
if isinstance(widget, QtWidgets.QAbstractItemView):
selectionMode = self.settings.value(
"selectionMode", type=QtWidgets.QAbstractItemView.SelectionMode
)
widget.setSelectionMode(selectionMode)
if isinstance(widget, QtWidgets.QListWidget):
items = self.settings.value("items")
selecteditems = self.settings.value("selecteditems")
# In the first reading the initial values must be established
if items is None:
self.read_defaults(widget)
else:
stream = QtCore.QDataStream(items, QtCore.QIODevice.ReadOnly)
while not stream.atEnd():
it = QtWidgets.QListWidgetItem()
stream >> it
widget.addItem(it)
stream = QtCore.QDataStream(
selecteditems, QtCore.QIODevice.ReadOnly
)
while not stream.atEnd():
row = stream.readInt()
it = widget.item(row)
if it is not None:
it.setSelected(True)
if isinstance(widget, QtWidgets.QTableWidget):
rowCount = self.settings.value("rowCount", type=int)
columnCount = self.settings.value("columnCount", type=int)
widget.setRowCount(rowCount)
widget.setColumnCount(columnCount)
items = self.settings.value("items")
if items is None:
self.read_defaults(widget)
else:
stream = QtCore.QDataStream(items, QtCore.QIODevice.ReadOnly)
while not stream.atEnd():
it = QtWidgets.QTableWidgetItem()
i = stream.readInt()
j = stream.readInt()
stream >> it
widget.setItem(i, j, it)
selecteditems = self.settings.value("selecteditems")
stream = QtCore.QDataStream(
selecteditems, QtCore.QIODevice.ReadOnly
)
while not stream.atEnd():
i = stream.readInt()
j = stream.readInt()
it = widget.item(i, j)
if it is not None:
it.setSelected(True)
self.settings.endGroup()
def write(self, widget):
self.settings.beginGroup(widget.objectName())
if isinstance(widget, QtWidgets.QAbstractItemView):
self.settings.setValue("selectionMode", widget.selectionMode())
if isinstance(widget, QtWidgets.QListWidget):
items = QtCore.QByteArray()
stream = QtCore.QDataStream(items, QtCore.QIODevice.WriteOnly)
for i in range(widget.count()):
stream << widget.item(i)
self.settings.setValue("items", items)
selecteditems = QtCore.QByteArray()
stream = QtCore.QDataStream(
selecteditems, QtCore.QIODevice.WriteOnly
)
for it in widget.selectedItems():
stream.writeInt(widget.row(it))
self.settings.setValue("selecteditems", selecteditems)
if isinstance(widget, QtWidgets.QTableWidget):
self.settings.setValue("rowCount", widget.rowCount())
self.settings.setValue("columnCount", widget.columnCount())
items = QtCore.QByteArray()
stream = QtCore.QDataStream(items, QtCore.QIODevice.WriteOnly)
for i in range(widget.rowCount()):
for j in range(widget.columnCount()):
it = widget.item(i, j)
if it is not None:
stream.writeInt(i)
stream.writeInt(j)
stream << it
self.settings.setValue("items", items)
selecteditems = QtCore.QByteArray()
stream = QtCore.QDataStream(
selecteditems, QtCore.QIODevice.WriteOnly
)
for it in widget.selectedItems():
# print(it.row(), it.column())
stream.writeInt(it.row())
stream.writeInt(it.column())
self.settings.setValue("selecteditems", selecteditems)
self.settings.endGroup()
def release(self):
self.m_settings.sync()
def read_defaults(self, widget):
if widget.objectName() == "listwidget_1":
widget.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)
for i in range(10):
widget.addItem(QtWidgets.QListWidgetItem(str(i)))
elif widget.objectName() == "listwidget_2":
widget.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)
for i in "abcdefghijklmnopqrstuvwxyz":
widget.addItem(QtWidgets.QListWidgetItem(i))
elif widget.objectName() == "tablewidget":
widget.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)
widget.setRowCount(10)
widget.setColumnCount(10)
for i in range(widget.rowCount()):
for j in range(widget.columnCount()):
it = QtWidgets.QTableWidgetItem("{}-{}".format(i, j))
widget.setItem(i, j, it)
@contextlib.contextmanager
def settingsContext(filename):
manager = SettingsManager(filename)
try:
yield manager
finally:
manager.release()
class Widget(QtWidgets.QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.listwidget_1 = QtWidgets.QListWidget(objectName="listwidget_1")
listwidget_2 = QtWidgets.QListWidget(objectName="listwidget_2")
tablewidget = QtWidgets.QTableWidget(objectName="tablewidget")
lay = QtWidgets.QVBoxLayout(self)
lay.addWidget(self.listwidget_1)
lay.addWidget(listwidget_2)
lay.addWidget(tablewidget)
self.read_settings()
def closeEvent(self, event):
self.write_settings()
super().closeEvent(event)
def read_settings(self):
with settingsContext("data.ini") as m:
for children in self.findChildren(QtWidgets.QWidget):
if children.objectName():
m.read(children)
def write_settings(self):
with settingsContext("data.ini") as m:
for children in self.findChildren(QtWidgets.QWidget):
if children.objectName():
m.write(children)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.resize(640, 480)
w.show()
sys.exit(app.exec_())
我正在使用 PyQt5 和 Py3.7，我正在尝试遍历我所有的 Qlistwidgets 并保存它们的字符串数据，同时也保存该小部件上的所有选定项目。我稍微修改了 here, but am having some trouble getting the selected items to save and restore using the listwidget array loop. I checked the docs but can't seem to understand how to add additional options into the array (such as save all selected items), from the Qt docs for SetArrayIndex, here.
的循环我的 listWidgets 将 selectionMode 设置为 MultiSelection。 我目前正在使用这个来保存：
def save_list_data(self):
self.settings = QSettings("data.ini", QSettings.IniFormat)
for name, obj in inspect.getmembers(self):
if isinstance(obj, QListWidget):
name = obj.objectName()
self.settings.beginWriteArray(name)
for i in range(obj.count()):
self.settings.setArrayIndex(i)
self.settings.setValue(name, obj.item(i).text())
self.settings.endArray()
然后使用以下方法恢复 listWidget 数据：
def open_list_data(self):
self.settings = QSettings("data.ini", QSettings.IniFormat)
for name, obj in inspect.getmembers(self):
if isinstance(obj, QListWidget):
name = obj.objectName()
size = self.settings.beginReadArray(name)
for i in range(size):
self.settings.setArrayIndex(i)
value = self.settings.value(name)
if value != None:
obj.addItem(value)
self.settings.endArray()
这适用于数据，但我如何才能从 ListWidgets 中获取选定的项目以保存和恢复？
对于我的解决方案，请考虑以下因素：
使用 inspect 模块可能对其他库有益，但对于 Qt，小部件不一定是 class 的成员，因此最好使用 Qt 自省本身使用 findChildren .
在您使用的示例中，您只保存了文本，但 QListWidgetItem 可以包含更多与角色相关的信息，例如背景色、前景色等。所以我将使用 QDataStream运算符，因为此获取和保存获取项目信息。
我将使用 "objectname/property" 格式来保存信息，因为同一个小部件可以有多个您要保存的属性。
保存选中项的信息，只需要保存行即可。
综合以上，解决方案是：
from PyQt5 import QtCore, QtGui, QtWidgets
class Widget(QtWidgets.QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.listwidget_1 = QtWidgets.QListWidget(
objectName="listwidget_1",
selectionMode=QtWidgets.QAbstractItemView.MultiSelection
)
listwidget_2 = QtWidgets.QListWidget(
objectName="listwidget_2",
selectionMode=QtWidgets.QAbstractItemView.MultiSelection
)
lay = QtWidgets.QVBoxLayout(self)
lay.addWidget(self.listwidget_1)
lay.addWidget(listwidget_2)
self.read_settings()
def closeEvent(self, event):
self.write_settings()
super().closeEvent(event)
def read_settings(self):
settings = QtCore.QSettings("data.ini", QtCore.QSettings.IniFormat)
childrens = self.findChildren(QtWidgets.QWidget)
for children in childrens:
if isinstance(children, QtWidgets.QListWidget) and children.objectName():
settings.beginGroup(children.objectName())
items = settings.value("items")
selecteditems = settings.value("selecteditems")
selectionMode = settings.value("selectionMode", type=QtWidgets.QAbstractItemView.SelectionMode)
children.setSelectionMode(selectionMode)
# In the first reading the initial values must be established
if items is None:
if children.objectName() == "listwidget_1":
for i in range(10):
children.addItem(QtWidgets.QListWidgetItem(str(i)))
elif children.objectName() == "listwidget_2":
for i in "abcdefghijklmnopqrstuvwxyz":
children.addItem(QtWidgets.QListWidgetItem(i))
else:
stream = QtCore.QDataStream(items, QtCore.QIODevice.ReadOnly)
while not stream.atEnd():
it = QtWidgets.QListWidgetItem()
stream >> it
children.addItem(it)
stream = QtCore.QDataStream(selecteditems, QtCore.QIODevice.ReadOnly)
while not stream.atEnd():
row = stream.readInt()
it = children.item(row)
it.setSelected(True)
settings.endGroup()
def write_settings(self):
settings = QtCore.QSettings("data.ini", QtCore.QSettings.IniFormat)
childrens = self.findChildren(QtWidgets.QWidget)
for children in childrens:
if isinstance(children, QtWidgets.QListWidget) and children.objectName():
settings.beginGroup(children.objectName())
items = QtCore.QByteArray()
stream = QtCore.QDataStream(items, QtCore.QIODevice.WriteOnly)
for i in range(children.count()):
stream << children.item(i)
selecteditems = QtCore.QByteArray()
stream = QtCore.QDataStream(selecteditems, QtCore.QIODevice.WriteOnly)
for it in children.selectedItems():
stream.writeInt(children.row(it))
settings.setValue("items", items)
settings.setValue("selecteditems", selecteditems)
settings.setValue("selectionMode", children.selectionMode())
settings.endGroup()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
加上：
import contextlib
from PyQt5 import QtCore, QtGui, QtWidgets
class SettingsManager:
def __init__(self, filename):
self.m_settings = QtCore.QSettings(filename, QtCore.QSettings.IniFormat)
@property
def settings(self):
return self.m_settings
def read(self, widget):
self.settings.beginGroup(widget.objectName())
if isinstance(widget, QtWidgets.QAbstractItemView):
selectionMode = self.settings.value(
"selectionMode", type=QtWidgets.QAbstractItemView.SelectionMode
)
widget.setSelectionMode(selectionMode)
if isinstance(widget, QtWidgets.QListWidget):
items = self.settings.value("items")
selecteditems = self.settings.value("selecteditems")
# In the first reading the initial values must be established
if items is None:
self.read_defaults(widget)
else:
stream = QtCore.QDataStream(items, QtCore.QIODevice.ReadOnly)
while not stream.atEnd():
it = QtWidgets.QListWidgetItem()
stream >> it
widget.addItem(it)
stream = QtCore.QDataStream(
selecteditems, QtCore.QIODevice.ReadOnly
)
while not stream.atEnd():
row = stream.readInt()
it = widget.item(row)
if it is not None:
it.setSelected(True)
if isinstance(widget, QtWidgets.QTableWidget):
rowCount = self.settings.value("rowCount", type=int)
columnCount = self.settings.value("columnCount", type=int)
widget.setRowCount(rowCount)
widget.setColumnCount(columnCount)
items = self.settings.value("items")
if items is None:
self.read_defaults(widget)
else:
stream = QtCore.QDataStream(items, QtCore.QIODevice.ReadOnly)
while not stream.atEnd():
it = QtWidgets.QTableWidgetItem()
i = stream.readInt()
j = stream.readInt()
stream >> it
widget.setItem(i, j, it)
selecteditems = self.settings.value("selecteditems")
stream = QtCore.QDataStream(
selecteditems, QtCore.QIODevice.ReadOnly
)
while not stream.atEnd():
i = stream.readInt()
j = stream.readInt()
it = widget.item(i, j)
if it is not None:
it.setSelected(True)
self.settings.endGroup()
def write(self, widget):
self.settings.beginGroup(widget.objectName())
if isinstance(widget, QtWidgets.QAbstractItemView):
self.settings.setValue("selectionMode", widget.selectionMode())
if isinstance(widget, QtWidgets.QListWidget):
items = QtCore.QByteArray()
stream = QtCore.QDataStream(items, QtCore.QIODevice.WriteOnly)
for i in range(widget.count()):
stream << widget.item(i)
self.settings.setValue("items", items)
selecteditems = QtCore.QByteArray()
stream = QtCore.QDataStream(
selecteditems, QtCore.QIODevice.WriteOnly
)
for it in widget.selectedItems():
stream.writeInt(widget.row(it))
self.settings.setValue("selecteditems", selecteditems)
if isinstance(widget, QtWidgets.QTableWidget):
self.settings.setValue("rowCount", widget.rowCount())
self.settings.setValue("columnCount", widget.columnCount())
items = QtCore.QByteArray()
stream = QtCore.QDataStream(items, QtCore.QIODevice.WriteOnly)
for i in range(widget.rowCount()):
for j in range(widget.columnCount()):
it = widget.item(i, j)
if it is not None:
stream.writeInt(i)
stream.writeInt(j)
stream << it
self.settings.setValue("items", items)
selecteditems = QtCore.QByteArray()
stream = QtCore.QDataStream(
selecteditems, QtCore.QIODevice.WriteOnly
)
for it in widget.selectedItems():
# print(it.row(), it.column())
stream.writeInt(it.row())
stream.writeInt(it.column())
self.settings.setValue("selecteditems", selecteditems)
self.settings.endGroup()
def release(self):
self.m_settings.sync()
def read_defaults(self, widget):
if widget.objectName() == "listwidget_1":
widget.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)
for i in range(10):
widget.addItem(QtWidgets.QListWidgetItem(str(i)))
elif widget.objectName() == "listwidget_2":
widget.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)
for i in "abcdefghijklmnopqrstuvwxyz":
widget.addItem(QtWidgets.QListWidgetItem(i))
elif widget.objectName() == "tablewidget":
widget.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)
widget.setRowCount(10)
widget.setColumnCount(10)
for i in range(widget.rowCount()):
for j in range(widget.columnCount()):
it = QtWidgets.QTableWidgetItem("{}-{}".format(i, j))
widget.setItem(i, j, it)
@contextlib.contextmanager
def settingsContext(filename):
manager = SettingsManager(filename)
try:
yield manager
finally:
manager.release()
class Widget(QtWidgets.QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.listwidget_1 = QtWidgets.QListWidget(objectName="listwidget_1")
listwidget_2 = QtWidgets.QListWidget(objectName="listwidget_2")
tablewidget = QtWidgets.QTableWidget(objectName="tablewidget")
lay = QtWidgets.QVBoxLayout(self)
lay.addWidget(self.listwidget_1)
lay.addWidget(listwidget_2)
lay.addWidget(tablewidget)
self.read_settings()
def closeEvent(self, event):
self.write_settings()
super().closeEvent(event)
def read_settings(self):
with settingsContext("data.ini") as m:
for children in self.findChildren(QtWidgets.QWidget):
if children.objectName():
m.read(children)
def write_settings(self):
with settingsContext("data.ini") as m:
for children in self.findChildren(QtWidgets.QWidget):
if children.objectName():
m.write(children)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.resize(640, 480)
w.show()
sys.exit(app.exec_())