如何从 PyQt4 中的 QVariant 取回我的 python 对象？

发布于 2024-08-22 12:04:10 字数 1424 浏览 4 评论 0原文

我正在创建 QAbstractItemModel 的子类以显示在 QTreeView 中。

我的 index() 和 parent() 函数使用 QAbstractItemModel 继承函数 createIndex< 创建 QModelIndex /code> 并为其提供所需的行、列和数据。这里，出于测试目的，数据是一个 Python 字符串。

class TestModel(QAbstractItemModel):
    def __init__(self):
        QAbstractItemModel.__init__(self)

    def index(self, row, column, parent):
        if parent.isValid():
            return self.createIndex(row, column, "bar")
        return self.createIndex(row, column, "foo")

    def parent(self, index):
        if index.isValid():
            if index.data().data() == "bar":                          <--- NEVER TRUE
                return self.createIndex(0, 0, "foo")
        return QModelIndex()

    def rowCount(self, index):
        if index.isValid():
            if index.data().data() == "bar":                          <--- NEVER TRUE
                return 0
        return 1

    def columnCount(self, index):
        return 1

    def data(self, index, role):
        if index.isValid():
            return index.data().data()                                <--- CANNOT DO ANYTHING WITH IT
        return "<None>"

在 index()、parent() 和 data() 函数中，我需要取回数据。它以 QVariant 形式出现。如何从 QVariant 取回我的 Python 对象？

原文

I am creating a subclass of QAbstractItemModel to be displayed in an QTreeView.

My index() and parent() function creates the QModelIndex using the QAbstractItemModel inherited function createIndex and providing it the row, column, and data needed. Here, for testing purposes, data is a Python string.

class TestModel(QAbstractItemModel):
    def __init__(self):
        QAbstractItemModel.__init__(self)

    def index(self, row, column, parent):
        if parent.isValid():
            return self.createIndex(row, column, "bar")
        return self.createIndex(row, column, "foo")

    def parent(self, index):
        if index.isValid():
            if index.data().data() == "bar":                          <--- NEVER TRUE
                return self.createIndex(0, 0, "foo")
        return QModelIndex()

    def rowCount(self, index):
        if index.isValid():
            if index.data().data() == "bar":                          <--- NEVER TRUE
                return 0
        return 1

    def columnCount(self, index):
        return 1

    def data(self, index, role):
        if index.isValid():
            return index.data().data()                                <--- CANNOT DO ANYTHING WITH IT
        return "<None>"

Within the index(), parent(), and data() functions I need to get my data back. It comes as a QVariant. How do I get my Python object back from the QVariant?

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拥有 2024-08-29 12:04:10

你试过这个吗？

my_python_object = my_qvariant.toPyObject()

http://pyqt.sourceforge.net/Docs/PyQt4/qvariant.html# toPyObject （只是为了完整性，但那里没什么可看的......）

Have you tried this?

my_python_object = my_qvariant.toPyObject()

http://pyqt.sourceforge.net/Docs/PyQt4/qvariant.html#toPyObject (just for completeness, but there isn't much to see there...)

回复收藏 0 原文

三月梨花 2024-08-29 12:04:10

关键是直接在QModelIndex上使用internalPointer()，而不是处理QVariant。

class TestModel(QAbstractItemModel):
    def __init__(self, plan):
        QAbstractItemModel.__init__(self)

    def index(self, row, column, parent):
        if not parent.isValid():
            return self.createIndex(row, column, "foo")
        return self.createIndex(row, column, "bar")

    def parent(self, index):
         if index.internalPointer() == "bar":
            return self.createIndex(0, 0, "foo")
        return QModelIndex()

    def rowCount(self, index):
        if index.internalPointer() == "bar":
            return 0
        return 1

    def columnCount(self, index):
        return 1

    def data(self, index, role):
        if role == 0:  # Qt.DisplayRole
            return index.internalPointer()
        else:
            return None

The key thing is to use internalPointer() directly on the QModelIndex, not dealing with the QVariant at all.

class TestModel(QAbstractItemModel):
    def __init__(self, plan):
        QAbstractItemModel.__init__(self)

    def index(self, row, column, parent):
        if not parent.isValid():
            return self.createIndex(row, column, "foo")
        return self.createIndex(row, column, "bar")

    def parent(self, index):
         if index.internalPointer() == "bar":
            return self.createIndex(0, 0, "foo")
        return QModelIndex()

    def rowCount(self, index):
        if index.internalPointer() == "bar":
            return 0
        return 1

    def columnCount(self, index):
        return 1

    def data(self, index, role):
        if role == 0:  # Qt.DisplayRole
            return index.internalPointer()
        else:
            return None

回复收藏 0 原文

~没有更多了~