Question

我已经从文件填充了Qlistview，文件中的每一行都变成了一行。现在，我想要另一个函数从qlistview中的所有已检查项创建另一个文件。我的列表视图如下。

 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，这是我尝试获得理想结果的尝试。不幸的是，它没有打印我检查的项目。当这样调用self.print_checked_items(model)时，我想知道可能出现什么问题？

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选中标记的项目。我删除了文件读/写行以进行测试。对于PyQt4和Python 2.7，您只需要修复几个导入和print语句。运行它，勾选几个项目，5秒后你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_()

如果我勾选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)

Answer 2

import sys
from PyQt4 import QtGui
from PyQt4 import QtCore


class AppRemovalPage(QtGui.QWizardPage):
    def __init__(self, parent=None):
        super(AppRemovalPage, self).__init__(parent=parent)
        self.setTitle('Apps to Remove')
        self.setSubTitle('Listview')
        self.list_view = QtGui.QListView(self)
        self.list_view.setMinimumSize(465, 200)
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.list_view)
        self.setLayout(layout)
        self.items = []
        self.isWritten = False

        loo = "/home/test1/file.txt"

        self.model = QtGui.QStandardItemModel(self.list_view)

        self.model.itemChanged.connect(self.setItems)

        file = QtCore.QFile(loo)
        if file.open(QtCore.QFile.ReadOnly | QtCore.QFile.Text):
            while not file.atEnd():
                line = bytearray(file.readLine()).decode().strip()
                item = QtGui.QStandardItem(line)
                item.setCheckable(True)
                item.setCheckState(QtCore.Qt.Unchecked)
                self.model.appendRow(item)
        self.list_view.setModel(self.model)
        self.list_view.show()

    def setItems(self, item):
        if item.checkState() == QtCore.Qt.Checked:
            self.items.append(item)
        if item.checkState() == QtCore.Qt.Unchecked:
            self.items.remove(item)

    def print_checked_items(self):
        path = "/home/test1/checked.txt"
        mode = QtCore.QFile.Append if self.isWritten else QtCore.QFile.WriteOnly
        if len(self.items) > 0:
            file = QtCore.QFile(path)
            if file.open(mode):
                for item in self.items:
                    print('%s' % item.text())
                    file.write(item.text() + "\n")
            file.close()
        print("print checked items executed")

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    wizard = QtGui.QWizard()

    appremoval = AppRemovalPage()
    wizard.addPage(appremoval)
    wizard.addPage(QtGui.QWizardPage())

    wizard.button(QtGui.QWizard.NextButton).clicked.connect(appremoval.print_checked_items)
    wizard.show()
    sys.exit(app.exec_())

输出：

a
d
e
print checked items executed

如何在Qlistview中获取Checked项目？

2 个答案: