pyqt5-QListWidget

Posted 2023-04-28 wd404

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1、介绍

list组件，或者说列表组件。

2、类和初始化

class QListWidget(QListView):

快速查询：

QListWidget(parent: typing.Optional[QWidget] = None)
addItem(self, aitem: QListWidgetItem)
addItem(self, label: str)
addItems(self, labels: Iterable[str])
clear(self)
closePersistentEditor(self, item: QListWidgetItem)
count(self) -> int
currentItem(self) -> QListWidgetItem
currentRow(self) -> int
dropMimeData(self, index: int, data: QMimeData, action: Qt.DropAction) -> bool
editItem(self, item: QListWidgetItem)
findItems(self, text: str, flags: Union[Qt.MatchFlags, Qt.MatchFlag]) -> List[QListWidgetItem]
indexFromItem(self, item: QListWidgetItem) -> QModelIndex
insertItem(self, row: int, item: QListWidgetItem)
insertItem(self, row: int, label: str)
insertItems(self, row: int, labels: Iterable[str])
isPersistentEditorOpen(self, item: QListWidgetItem) -> bool
isSortingEnabled(self) -> bool
item(self, row: int) -> QListWidgetItem
itemAt(self, p: QPoint) -> QListWidgetItem
itemAt(self, ax: int, ay: int) -> QListWidgetItem
itemFromIndex(self, index: QModelIndex) -> QListWidgetItem
items(self, data: QMimeData) -> List[QListWidgetItem]
itemWidget(self, item: QListWidgetItem) -> QWidget
mimeData(self, items: Iterable[QListWidgetItem]) -> QMimeData
mimeTypes(self) -> List[str]
openPersistentEditor(self, item: QListWidgetItem)
removeItemWidget(self, aItem: QListWidgetItem)
row(self, item: QListWidgetItem) -> int
scrollToItem(self, item: QListWidgetItem, hint: QAbstractItemView.ScrollHint = QAbstractItemView.EnsureVisible)
selectedItems(self) -> List[QListWidgetItem]
setCurrentItem(self, item: QListWidgetItem)
setCurrentItem(self, item: QListWidgetItem, command: Union[QItemSelectionModel.SelectionFlags, QItemSelectionModel.SelectionFlag])
setCurrentRow(self, row: int)
setCurrentRow(self, row: int, command: Union[QItemSelectionModel.SelectionFlags, QItemSelectionModel.SelectionFlag])
setItemWidget(self, item: QListWidgetItem, widget: QWidget)
setSelectionModel(self, selectionModel: QItemSelectionModel)
setSortingEnabled(self, enable: bool)
sortItems(self, order: Qt.SortOrder = Qt.AscendingOrder)
supportedDropActions(self) -> Qt.DropActions
takeItem(self, row: int) -> QListWidgetItem
visualItemRect(self, item: QListWidgetItem) -> QRect
Return len(self).
---------------
dropEvent(self, event: QDropEvent)
event(self, e: QEvent) -> bool
---------------
currentItemChanged(self, current: QListWidgetItem, previous: QListWidgetItem) [signal]
currentRowChanged(self, currentRow: int) [signal]
currentTextChanged(self, currentText: str) [signal]
itemActivated(self, item: QListWidgetItem) [signal]
itemChanged(self, item: QListWidgetItem) [signal]
itemClicked(self, item: QListWidgetItem) [signal]
itemDoubleClicked(self, item: QListWidgetItem) [signal]
itemEntered(self, item: QListWidgetItem) [signal]
itemPressed(self, item: QListWidgetItem) [signal]
itemSelectionChanged(self) [signal]

3、方法

基本可以参考QComboBox组件的相关使用

4、事件

PyQt5 QListWidget自定义项目[重复]

【中文标题】PyQt5 QListWidget自定义项目[重复]【英文标题】：PyQt5 QListWidget custom items [duplicate] 【发布时间】：2020-02-05 10:48:09 【问题描述】：

我对 PyQt5 非常陌生，我正在尝试为 python3+ 中的 qlistwidget 制作自定义 qlistwidgetitem，但到目前为止没有成功。

我喜欢并尝试移植的原始代码来自此链接。不幸的是，它在 PyQt4 中：

PyQt QListWidget custom items

import sys
from PyQt4 import QtGui

class QCustomQWidget (QtGui.QWidget):
    def __init__ (self, parent = None):
        super(QCustomQWidget, self).__init__(parent)
        self.textQVBoxLayout = QtGui.QVBoxLayout()
        self.textUpQLabel    = QtGui.QLabel()
        self.textDownQLabel  = QtGui.QLabel()
        self.textQVBoxLayout.addWidget(self.textUpQLabel)
        self.textQVBoxLayout.addWidget(self.textDownQLabel)
        self.allQHBoxLayout  = QtGui.QHBoxLayout()
        self.iconQLabel      = QtGui.QLabel()
        self.allQHBoxLayout.addWidget(self.iconQLabel, 0)
        self.allQHBoxLayout.addLayout(self.textQVBoxLayout, 1)
        self.setLayout(self.allQHBoxLayout)
        # setStyleSheet
        self.textUpQLabel.setStyleSheet('''
            color: rgb(0, 0, 255);
        ''')
        self.textDownQLabel.setStyleSheet('''
            color: rgb(255, 0, 0);
        ''')

    def setTextUp (self, text):
        self.textUpQLabel.setText(text)

    def setTextDown (self, text):
        self.textDownQLabel.setText(text)

    def setIcon (self, imagePath):
        self.iconQLabel.setPixmap(QtGui.QPixmap(imagePath))

class exampleQMainWindow (QtGui.QMainWindow):
    def __init__ (self):
        super(exampleQMainWindow, self).__init__()
        # Create QListWidget
        self.myQListWidget = QtGui.QListWidget(self)
        for index, name, icon in [
            ('No.1', 'Meyoko',  'icon.png'),
            ('No.2', 'Nyaruko', 'icon.png'),
            ('No.3', 'Louise',  'icon.png')]:
            # Create QCustomQWidget
            myQCustomQWidget = QCustomQWidget()
            myQCustomQWidget.setTextUp(index)
            myQCustomQWidget.setTextDown(name)
            myQCustomQWidget.setIcon(icon)
            # Create QListWidgetItem
            myQListWidgetItem = QtGui.QListWidgetItem(self.myQListWidget)
            # Set size hint
            myQListWidgetItem.setSizeHint(myQCustomQWidget.sizeHint())
            # Add QListWidgetItem into QListWidget
            self.myQListWidget.addItem(myQListWidgetItem)
            self.myQListWidget.setItemWidget(myQListWidgetItem, myQCustomQWidget)
        self.setCentralWidget(self.myQListWidget)

app = QtGui.QApplication([])
window = exampleQMainWindow()
window.show()
sys.exit(app.exec_())

欢迎任何帮助。

【问题讨论】：

【参考方案1】：

PyQt4 和 PyQt5 的区别https://docs.huihoo.com/pyqt/PyQt5/pyqt4_differences.html#differences-between-pyqt4-and-pyqt5

import sys
#from PyQt4 import QtGui
from PyQt5 import QtGui, QtWidgets


class QCustomQWidget (QtWidgets.QWidget):                       # QtWidgets
    def __init__ (self, parent = None):
        super(QCustomQWidget, self).__init__(parent)
        self.textQVBoxLayout = QtWidgets.QVBoxLayout()          # QtWidgets
        self.textUpQLabel    = QtWidgets.QLabel()               # QtWidgets
        self.textDownQLabel  = QtWidgets.QLabel()               # QtWidgets
        self.textQVBoxLayout.addWidget(self.textUpQLabel)
        self.textQVBoxLayout.addWidget(self.textDownQLabel)
        self.allQHBoxLayout  = QtWidgets.QHBoxLayout()          # QtWidgets
        self.iconQLabel      = QtWidgets.QLabel()               # QtWidgets
        self.allQHBoxLayout.addWidget(self.iconQLabel, 0)
        self.allQHBoxLayout.addLayout(self.textQVBoxLayout, 1)
        self.setLayout(self.allQHBoxLayout)
        # setStyleSheet
        self.textUpQLabel.setStyleSheet('''
            color: rgb(0, 0, 255);
        ''')
        self.textDownQLabel.setStyleSheet('''
            color: rgb(255, 0, 0);
        ''')

    def setTextUp (self, text):
        self.textUpQLabel.setText(text)

    def setTextDown (self, text):
        self.textDownQLabel.setText(text)

    def setIcon (self, imagePath):
        self.iconQLabel.setPixmap(QtGui.QPixmap(imagePath).scaled(60, 60))   # + .scaled(60, 60

class exampleQMainWindow (QtWidgets.QMainWindow):                            # QtWidgets
    def __init__ (self):
        super(exampleQMainWindow, self).__init__()
        # Create QListWidget
        self.myQListWidget = QtWidgets.QListWidget(self)                     # QtWidgets
        for index, name, icon in [
            ('No.1', 'Meyoko',  'lena-2.png'),
            ('No.2', 'Nyaruko', 'im.png'),
            ('No.3', 'Louise',  'Ok.png')]:
            # Create QCustomQWidget
            myQCustomQWidget = QCustomQWidget()
            myQCustomQWidget.setTextUp(index)
            myQCustomQWidget.setTextDown(name)
            myQCustomQWidget.setIcon(icon)
            # Create QListWidgetItem
            myQListWidgetItem = QtWidgets.QListWidgetItem(self.myQListWidget)  # QtWidgets
            # Set size hint
            myQListWidgetItem.setSizeHint(myQCustomQWidget.sizeHint())
            # Add QListWidgetItem into QListWidget
            self.myQListWidget.addItem(myQListWidgetItem)
            self.myQListWidget.setItemWidget(myQListWidgetItem, myQCustomQWidget)
        self.setCentralWidget(self.myQListWidget)


if __name__ == '__main__':
    app = QtWidgets.QApplication([])                                           # QtWidgets
    window = exampleQMainWindow()
    window.show()
    sys.exit(app.exec_())

【讨论】：

myQListWidgetItem = QtWidgets.QListWidgetItem(self.myQListWidget) 这是我不明白的唯一一行。这会将项目实例化为列表、列表的子项还是其他内容？ @MichaelEffraimidis doc.qt.io/qt-5/qlistwidgetitem.html#details 我已成功创建自定义小部件列表。我该如何继续以有效的方式删除它（列表是动态的）？我尝试了 myQListWidget.removeItemWidget(myQCustomQWidget) 但它丢弃了错误“参数 1 具有意外类型'myQCustomQWidget'。我必须保留并使用 myQListWidgetItem 变量还是有更有效的方法？ @MichaelEffraimidis 如果您有其他问题，您应该创建一个新问题。

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