CODEWITHSUNDEEP
pythonpyqt
alphanumeric
alphanumeric

Reputation: 19379

How to remove Item from QListWidget

I'm stuck using myItem.hide() method every time I need to remove Item from QListWidget list. Hiding an item instead of deleting/removing makes things unnecessary complex. I would appreciate if you show me how to delete Item from ListWidget permanently.

enter image description here

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)

Upvotes: 11

Views: 45588

Answers (3)

Robot Inc
Robot Inc

Reputation: 51

A ListWidget is a list of ListWidgetItems. A ListWidgetItems can be assigned a custom widget to override the default, so removeItemWidget() only removes the custom widget. Hence the need for takeItem, which pops the item from the list and returns it (similar to how a python list works)

Upvotes: 1

alphanumeric
alphanumeric

Reputation: 19379

Posting here an example showing how to implement same approach but now applied to QTreeWidget which a bit more involved than QListWidget.

enter image description here

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()

Upvotes: 4

Salvatore Avanzo
Salvatore Avanzo

Reputation: 2786

I don't know why but removeItemWidget don't work as expected. You have to use take item instead:

def removeSel(self):
    listItems=self.listA.selectedItems()
    if not listItems: return        
    for item in listItems:
       self.listA.takeItem(self.listA.row(item))

Upvotes: 31

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