python - 如何在 Qlistview 中获取选中的项目？

Question

我从一个文件中填充了一个 Qlistview，文件中的每一行都变成了一行。现在，我想要另一个函数来从 qlistview 中的所有选中项目创建另一个文件。我的 ListView 如下。

 def show_list(self, file_in):
        QListView.__init__(self)
        QListView.setWindowFlags(self, QtCore.Qt.WindowStaysOnTopHint)
        QListView.setWindowTitle(self, "ListView")
        self.buttonBox = QtGui.QDialogButtonBox(self)
        self.buttonBox.setOrientation(QtCore.Qt.Horizontal)
        self.buttonBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok)
        list_view = QListView(self)
        list_view.setMinimumSize(350,350)

        self.verticalLayout = QtGui.QVBoxLayout(self)
        self.verticalLayout.addWidget(list_view)
        self.verticalLayout.addWidget(self.buttonBox)
        self.buttonBox.accepted.connect(self.close)
        self.buttonBox.rejected.connect(self.close)
        model = QStandardItemModel(list_view)
        with open(file_in) as f:
            if f is not None:
                item = f.readlines()
            for line in item:
                item = QStandardItem(line)
                item.setCheckable(True)
                item.setCheckState(QtCore.Qt.Unchecked)
                model.appendRow(item)

        list_view.setModel(model)
        list_view.show()

到目前为止，这是我为获得我想要的结果所做的尝试。不幸的是，它不打印我选中的项目。当像这样调用时 self.print_checked_items(model) 我想知道可能出了什么问题？

def print_checked_items(self, model):
    path = "/home/test1/checked.txt"
    for index in range(model.rowCount()):
        item = model.item(index)
        if item.isCheckable() and item.checkState() == QtCore.Qt.Checked:
            with open(path, "a") as f_out:
                print ('%s\n' % item.text())
                f_out.write('%s\n' % item.text()

Answer 1

当我在 Python 3.5 和 PyQt5 中运行它时，它工作正常，它打印正确的模式和勾选的项目。我删除了文件读取/写入行以进行测试。对于 PyQt4 和 Python 2.7，您应该只需要修复几个导入和打印语句。运行它，勾选几个项目，5 秒后您在控制台中看到了什么？

from PyQt5 import QtCore

from PyQt5 import QtGui
from PyQt5.QtCore import QTimer
from PyQt5.QtWidgets import QApplication, QWizardPage, QListView


class AppRemovalPage(QWizardPage):
    def __init__( self, parent ):
        super(AppRemovalPage, self).__init__(parent)
        self.setTitle('Apps to Remove')
        self.setSubTitle('Listview')
        self.list_view = QListView(self)
        self.list_view.setMinimumSize(465, 200)
        self.isWritten = False
        loo = "/home/test1/file.txt"

        self.model = QtGui.QStandardItemModel(self.list_view)
        for line in ('a', 'b', 'c', 'd', 'e'):
            self.item = QtGui.QStandardItem(line)
            self.item.setCheckable(True)
            self.item.setCheckState(QtCore.Qt.Unchecked)
            self.model.appendRow(self.item)

        self.list_view.setModel(self.model)
        self.list_view.show()


    def print_checked_items(self):
        for index in range(self.model.rowCount()):
            item = self.model.item(index)
            if item.checkState() == QtCore.Qt.Checked:
                if self.isWritten:
                    mode = "a"
                else:
                    mode = "w"
                    self.isWritten = True
                print ('%s' % item.text())

        print("print checked items executed")


app = QApplication([])
listview = AppRemovalPage(None)
listview.show()
QTimer.singleShot(5000, listview.print_checked_items)
app.exec_()

如果我选中 a、c 和 d，我会看到:

a w
c a
d a
print checked items executed

更新以显示 Python 文件对象如何工作(实际上是更好的代码，因为它支持使用上下文管理):

def print_checked_items(self):
    path = "checked.txt"
    mode = 'a' if self.isWritten else 'w'
    if len(self.items) > 0:
        with open(path, mode) as file:
            for item in self.items:
                print('%s' % item.text())
                file.write(item.text() + "\n")
        file.close()
    print("print checked items executed")

连接可以写成wizard.button(QWizard.NextButton).clicked.connect(appremoval.print_checked_items)