PyQt 开始删除行

发布于 2024-08-21 05:13:16 字数 1835 浏览 3 评论 0原文

在下面的示例中：

from PyQt4 import QtCore, QtGui

class Ui_Dialog(QtGui.QDialog):

    def __init__(self,parent=None):
        QtGui.QDialog.__init__(self,parent)
        self.setObjectName("Dialog")
        self.resize(600, 500)

        self.model = QtGui.QDirModel()
        self.tree = QtGui.QTreeView()
        self.tree.setModel(self.model)
        print(self.model.flags(self.model.index("c:\Program Files")))
        self.model.setFilter(QtCore.QDir.Dirs|QtCore.QDir.NoDotAndDotDot)

        self.tree.setSortingEnabled(True)

        self.tree.setRootIndex(self.model.index("c:\Program Files"))

        #self.tree.hideColumn(1)
        #self.tree.hideColumn(2)
        #self.tree.hideColumn(3)
        self.tree.setWindowTitle("Dir View")
        self.tree.resize(400, 480)
        self.tree.setColumnWidth(0,200)

        self.tree.show()
        QtCore.QObject.connect(self.tree, QtCore.SIGNAL("clicked(QModelIndex)"), self.test)
        QtCore.QMetaObject.connectSlotsByName(self)

        self.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))

    def test(self,index):

        print(self.model.filePath(index))

        print(self.model.rowCount(index))
         #self.model.beginRemoveRows(index.parent(),index.row(),self.model.rowCount(index))
        #self.model.endRemoveRows()

        print("Row of the index =",index.row())

        print("Parent = ",self.model.data(index.parent()))

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    ui = Ui_Dialog()
    #ui.show()
    sys.exit(app.exec_())

我想在单击该行时删除该行及其子项（如果有）。
（单击下的文件夹及其子文件夹必须被删除。）

我知道我在这一行上犯了错误：

self.model.beginRemoveRows(index.parent(),index.row(),self.model.rowCount(index))

感谢您的宝贵时间。

原文

In the example below:

from PyQt4 import QtCore, QtGui

class Ui_Dialog(QtGui.QDialog):

    def __init__(self,parent=None):
        QtGui.QDialog.__init__(self,parent)
        self.setObjectName("Dialog")
        self.resize(600, 500)

        self.model = QtGui.QDirModel()
        self.tree = QtGui.QTreeView()
        self.tree.setModel(self.model)
        print(self.model.flags(self.model.index("c:\Program Files")))
        self.model.setFilter(QtCore.QDir.Dirs|QtCore.QDir.NoDotAndDotDot)

        self.tree.setSortingEnabled(True)

        self.tree.setRootIndex(self.model.index("c:\Program Files"))

        #self.tree.hideColumn(1)
        #self.tree.hideColumn(2)
        #self.tree.hideColumn(3)
        self.tree.setWindowTitle("Dir View")
        self.tree.resize(400, 480)
        self.tree.setColumnWidth(0,200)

        self.tree.show()
        QtCore.QObject.connect(self.tree, QtCore.SIGNAL("clicked(QModelIndex)"), self.test)
        QtCore.QMetaObject.connectSlotsByName(self)

        self.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))

    def test(self,index):

        print(self.model.filePath(index))

        print(self.model.rowCount(index))
         #self.model.beginRemoveRows(index.parent(),index.row(),self.model.rowCount(index))
        #self.model.endRemoveRows()

        print("Row of the index =",index.row())

        print("Parent = ",self.model.data(index.parent()))

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    ui = Ui_Dialog()
    #ui.show()
    sys.exit(app.exec_())

I want to remove the row and its children (if any) when i click on it.
(The folder under click and it's children have to be removed.)

I know I'm making mistake on this line:

self.model.beginRemoveRows(index.parent(),index.row(),self.model.rowCount(index))

Thanks for your time.

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我早已燃尽 2024-08-28 05:13:16

我知道我在这件事上犯了错误
行：
self.model.beginRemoveRows(index.parent(),index.row(),self.model.rowCount(index))

是的，你说得对。让我们看看您传递的内容：

index.parent() - the parent of index
index.row() - the row number of index, the row you want deleted
self.model.rowCount(index) - the number of total children had by index

现在，看看 beginRemoveRows：

告诉它您要从 index.row() 中删除等于索引子级数量的行。你的亲子指数不匹配。

您真正想要的是：

beginRemoveRows(index.parent(), index.row(), index.row())

如果您删除 index.row() 处的行，它的所有子项都将自动删除。

但是，还有一个更大的问题：beginRemoveRows() 不会不删除任何行。它只是提醒您的模型您将要删除行。当您调用 endRemoveRows() 时，模型会让任何监听者知道它已更新，以便他们可以正确重绘。

在 C++ 中，您不允许调用 beginRemoveRows()，因为它们是受保护的方法，只有模型才能调用。

要根据需要进行过滤，您需要创建一个自定义代理模型（即 QSortFilterProxyModel< /a>) 执行您想要的过滤。然后，您将在信号处理程序中操作 QSortFilterProxy 模型作为响应。

I know I'm making mistake on this
line:
self.model.beginRemoveRows(index.parent(),index.row(),self.model.rowCount(index))

Yes, you're right. Let's look at what you're passing in:

index.parent() - the parent of index
index.row() - the row number of index, the row you want deleted
self.model.rowCount(index) - the number of total children had by index

Now, take a look at the picture in the documentation on beginRemoveRows:

Your telling it that you want to remove from index.row() to the row equal to the number of children had by index. Your mis-matching your parent-child indices.

What you really wanted was:

beginRemoveRows(index.parent(), index.row(), index.row())

If you remove the row at index.row(), all of its children will be removed automatically.

BUT, there's a bigger problem: beginRemoveRows() does NOT remove any rows. It simply alerts your model that you are going to be removing rows. When you call endRemoveRows(), the model will then let anybody listening know that it's been updated so they can redraw correctly.

In C++, you wouldn't be allowed to call beginRemoveRows() because they are protected methods that only the model is intended to call.

To filter as you'd like, you'll need to create a custom proxy model (i.e. QSortFilterProxyModel) that does the filtering you want. You'll then manipulate the QSortFilterProxy model in response in your signal handler.

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