pyqt：显示用户选择的 QListWidget 中存在的所有值

Question

我已经搜索了很多，但找不到解决方案。

我有一个 QListWidget，它将填充一个值列表。我需要在列表中实现 "select all" 作为默认行为。

我已经使用了 MultiSelection 并且效果很好，但需要避免单击每个项目，以防用户想要对列出的所有项目进行更新。

有人可以帮助我了解如何执行此操作吗？

Answer 1

使用QtWidgets.QAbstractItemView.ExtendedSelection

When the user selects an item in the usual way, the selection is cleared and the new item selected. However, if the user presses the Ctrl key when clicking on an item, the clicked item gets toggled and all other items are left untouched. If the user presses the Shift key while clicking on an item, all items between the current item and the clicked item are selected or unselected, depending on the state of the clicked item. Multiple items can be selected by dragging the mouse over them.

import sys
from PyQt5 import QtWidgets

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)

    w = QtWidgets.QListWidget()
    for i in range(12):
        w.addItem('Item {}'.format(i))

    w.setSelectionMode(QtWidgets.QAbstractItemView.ExtendedSelection)  

    #w.setSelectionMode(QtWidgets.QAbstractItemView.MultiSelection)  

    w.show()
    sys.exit(app.exec_())

Answer 2

据我了解，您想实现一个选择所有项目的功能，解决方案是使用 QListWidget 的 setSelected() 方法进行迭代，如下所示：

import sys
from PyQt4 import QtCore, QtGui


class ListWidget(QtGui.QListWidget):
    def __init__(self, parent=None):
        super(ListWidget, self).__init__(parent)
        self.setSelectionMode(QtGui.QListWidget.MultiSelection)

    @QtCore.pyqtSlot()
    def selectAll(self):
        for i in range(self.count()):
            it = self.item(i)
            if it is not None:
                it.setSelected(True)

    @QtCore.pyqtSlot()
    def clearSelection(self):
        for i in range(self.count()):
            it = self.item(i)
            if it is not None:
                it.setSelected(False)


class Widget(QtGui.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)

        lay = QtGui.QVBoxLayout(self)

        button_sel = QtGui.QPushButton("Select All")
        button_unsel = QtGui.QPushButton("Clear Selection")

        self.list_widget = ListWidget()

        for letter in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
            it = QtGui.QListWidgetItem(letter)
            self.list_widget.addItem(it)

        button_sel.clicked.connect(self.list_widget.selectAll)
        button_unsel.clicked.connect(self.list_widget.clearSelection)

        lay.addWidget(button_sel)
        lay.addWidget(button_unsel)
        lay.addWidget(self.list_widget)     


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

pyqt：显示用户选择的 QListWidget 中存在的所有值

pyqt : Display All values present in QListWidget as selected to user

python

pyqt

pyqt4