[英]How to remove Item from QListWidget
I'm stuck using myItem.hide() method every time I need to remove Item from QListWidget list. 每次我需要从QListWidget列表中删除Item时,我都会使用myItem.hide()方法。 Hiding an item instead of deleting/removing makes things unnecessary complex. 隐藏项目而不是删除/删除会使事情变得不必要。 I would appreciate if you show me how to delete Item from ListWidget permanently. 如果您告诉我如何永久地从ListWidget中删除Item,我将不胜感激。
from PyQt4 import QtGui, QtCore
class MyApp(object):
def __init__(self):
super(MyApp, self).__init__()
self.mainWidget = QtGui.QWidget()
self.mainLayout = QtGui.QVBoxLayout()
self.mainWidget.setLayout(self.mainLayout)
self.hLayout = QtGui.QHBoxLayout()
self.mainLayout.insertLayout(0, self.hLayout)
self.listA=QtGui.QListWidget()
for i in range(3):
self.listA.addItem('Item '+str(i))
self.hLayout.addWidget(self.listA)
self.buttonGroupbox = QtGui.QGroupBox()
self.buttonlayout = QtGui.QVBoxLayout()
self.buttonGroupbox.setLayout(self.buttonlayout)
okButton = QtGui.QPushButton('Remove Selected')
okButton.clicked.connect(self.removeSel)
self.buttonlayout.addWidget(okButton)
self.mainLayout.addWidget(self.buttonGroupbox)
self.mainWidget.show()
sys.exit(app.exec_())
def removeSel(self):
listItems=self.listA.selectedItems()
if not listItems: return
for item in listItems:
print type(item), dir(item)
I don't know why but removeItemWidget don't work as expected. 我不知道为什么但removeItemWidget不能按预期工作。 You have to use take item instead: 你必须使用take项目:
def removeSel(self):
listItems=self.listA.selectedItems()
if not listItems: return
for item in listItems:
self.listA.takeItem(self.listA.row(item))
Posting here an example showing how to implement same approach but now applied to QTreeWidget
which a bit more involved than QListWidget
. 这里发布一个示例,显示如何实现相同的方法,但现在应用于QTreeWidget
,它比QListWidget
更复杂。
from PyQt4 import QtGui, QtCore
class MyApp(object):
def __init__(self):
super(MyApp, self).__init__()
self.mainWidget = QtGui.QWidget()
self.mainLayout = QtGui.QVBoxLayout()
self.mainWidget.setLayout(self.mainLayout)
self.hLayout = QtGui.QHBoxLayout()
self.mainLayout.insertLayout(0, self.hLayout)
self.listA=QtGui.QTreeWidget()
self.listA.setColumnCount(3)
self.listA.setHeaderLabels(['Checkbox','Name','Data'])
for i in range(3):
item=QtGui.QTreeWidgetItem()
item.setCheckState(0,QtCore.Qt.Checked)
item.setText(1, 'Item '+str(i))
item.setData(2, QtCore.Qt.UserRole, id(item) )
item.setText(2, str(id(item) ) )
self.listA.addTopLevelItem(item)
self.hLayout.addWidget(self.listA)
self.buttonGroupbox = QtGui.QGroupBox()
self.buttonlayout = QtGui.QVBoxLayout()
self.buttonGroupbox.setLayout(self.buttonlayout)
okButton = QtGui.QPushButton('Remove Selected')
okButton.clicked.connect(self.removeSel)
self.buttonlayout.addWidget(okButton)
getDataButton = QtGui.QPushButton('Get Items Data')
getDataButton.clicked.connect(self.getItemsData)
self.buttonlayout.addWidget(getDataButton)
self.mainLayout.addWidget(self.buttonGroupbox)
self.mainWidget.show()
sys.exit(app.exec_())
def removeSel(self):
listItems=self.listA.selectedItems()
if not listItems: return
for item in listItems:
itemIndex=self.listA.indexOfTopLevelItem(item)
self.listA.takeTopLevelItem(itemIndex)
print '\n\t Number of items remaining', self.listA.topLevelItemCount()
def getItemsData(self):
for i in range(self.listA.topLevelItemCount()):
item=self.listA.topLevelItem(i)
itmData=item.data(2, QtCore.Qt.UserRole)
itemId=itmData.toPyObject()
print '\n\t Item Id Stored as Item Data:', itemId, 'Item Checkbox State:', item.checkState(0)
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
MyApp()
A ListWidget is a list of ListWidgetItems. ListWidget是ListWidgetItems的列表。 A ListWidgetItems can be assigned a custom widget to override the default, so removeItemWidget() only removes the custom widget. 可以为ListWidgetItems分配一个自定义小部件来覆盖默认小部件,因此removeItemWidget()仅删除自定义小部件。 Hence the need for takeItem, which pops the item from the list and returns it (similar to how a python list works) 因此需要takeItem,它从列表中弹出项目并返回它(类似于python列表的工作方式)
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