PySide6 GUI 编程（10）：QListWidget的使用

from PySide6.QtWidgets import QApplication, QListWidget, QMainWindow

def text_changed(i: str):
    print('text changed to: {}'.format(i))


class MyListWidget(QMainWindow):
    def __init__(self):
        super().__init__()

        my_list = QListWidget()
        my_list.addItems(['a', 'b', 'c', 'd', 'e'])

        my_list.currentTextChanged.connect(text_changed)
        print('default selection mode:', my_list.selectionMode())

        self.setCentralWidget(my_list)


if __name__ == '__main__':
    app = QApplication()
    ins = MyListWidget()
    ins.show()
    app.exec()

from PySide6.QtCore import QItemSelection
from PySide6.QtWidgets import QApplication, QComboBox, QListWidget, QMainWindow, QVBoxLayout, QWidget

selectionMap = {
    'SingleSelection': QListWidget.SelectionMode.SingleSelection,
    'NoSelection': QListWidget.SelectionMode.NoSelection,
    'ExtendedSelection': QListWidget.SelectionMode.ExtendedSelection,
    'ContiguousSelection': QListWidget.SelectionMode.ContiguousSelection,
    'MultiSelection': QListWidget.SelectionMode.MultiSelection,
}


class ListWidgetSelectionModes(QMainWindow):
    def __init__(self):
        super().__init__()

        my_combobox = QComboBox()
        my_combobox.addItems(list(selectionMap.keys()))
        my_combobox.setWindowTitle('ListWidget Selection Modes')
        my_combobox.setEditable(False)
        my_combobox.setMaxVisibleItems(len(list(selectionMap.keys())))
        my_combobox.setMaxCount(len(list(selectionMap.keys())))
        my_combobox.setDuplicatesEnabled(False)
        my_combobox.currentTextChanged.connect(self.change_list_selection_mode)

        self.my_list_widget = QListWidget()
        self.my_list_widget.addItems([chr(x) for x in range(ord('a'), ord('z') + 1)])
        self.my_list_widget.selectionModel().selectionChanged.connect(self.list_selection_changed)

        my_v_layout = QVBoxLayout()
        my_v_layout.addWidget(my_combobox)
        my_v_layout.addWidget(self.my_list_widget)

        container = QWidget()
        container.setLayout(my_v_layout)

        self.setCentralWidget(container)

    def change_list_selection_mode(self, selection_mode: str):
        self.my_list_widget.setSelectionMode(selectionMap[selection_mode])
        print('change selection mode to: {}'.format(selection_mode))

    def list_selection_changed(self, selected: QItemSelection, deselected: QItemSelection):
        selected_indexes = [index.row() for index in selected.indexes()]
        deselected_indexes = [index.row() for index in deselected.indexes()]
        print("Selected Items indexes:", selected_indexes,
              'Items data:', [x.text() for x in self.my_list_widget.selectedItems()],
              "Deselected items:", deselected_indexes)


if __name__ == '__main__':
    app = QApplication()
    ins = ListWidgetSelectionModes()
    ins.show()
    app.exec()