如何排序使用Qt.UserRole Qt中而QListView项目(How to sort item

我有一些问题的排序在我的项目QListView在我指定的领域使用的值。

基本上我试图做的是这样的：

检测人脸的照片集并在显示它们QListView
簇面（图像）
通过将列表中的项（其是人脸图像）属于在一起同一群集更新视图。具体地说，如果第1项，3，5是在一个簇和物品2，4，6是在另一个，那么之前的任何项目2,4中，显示6个项目1，3，5应该被显示（在任何置换）或相反亦然。

我去了解这样做的方法是设置一个UserRole领域各QStandardItem在我的名单到集群标签，然后试图让QStandardModel根据这个排序UserRole 。那么这将显示相同的簇（即，与在相同的簇标签中的项目UserRole ）彼此相邻。

我能够设置UserRole成功的项目，但呼吁排序功能QStandardModel的项目并没有进行排序，即使当我设置样的角色成为默认DisplayRole （即排序根据每个面的文本标签）它的工作如预期。

谁能告诉我什么是错我的代码或提供一种替代方法？我GOOGLE了排序名单，我发现下面的链接QSortFilterProxyModel但我很新的Qt的，我不能使它适应我的处境。

在此先感谢任何答复。

下面是相关的代码：

import os
from PySide.QtGui import QListView, QStandardItemModel, QStandardItem, QIcon
from PySide.QtCore import Qt

class FacesView(QListView):
    """
    View to display detected faces for user to see and label.
    """
    UNCLUSTERED_LABEL = -1
    CLUSTER_ROLE = Qt.UserRole + 1

    def __init__(self, *args):
        super(FacesView, self).__init__(*args)
        self._dataModel = QStandardItemModel()
        self.setModel(self._dataModel)
        # Layout items in batches instead of waiting for all items to be
        # loaded before user is allowed to interact with them.
        self.setLayoutMode(QListView.Batched)

    def updateFaceClusters(self, labels):
        """Update the cluster label for each face.
        @param labels: [1 x N] array where each element is an integer
        for the cluster the face belongs to."""

        assert(len(labels) == self._dataModel.rowCount())
        # Put the cluster label each item/face belong to in the
        # CLUSTER_ROLE field.
        for i in xrange(self._dataModel.rowCount()):
            index = self._dataModel.index(i, 0)
            self._dataModel.setData(index, labels[i], self.CLUSTER_ROLE)

        # Use cluster label as sort role
        self._dataModel.setSortRole(self.CLUSTER_ROLE)
        # This does NOT seem to sort the items even though it works fine
        # when sort role is the default Qt.DisplayRole.
        self._dataModel.sort(0)
        print("Finished updating face clusters")

    def itemsInList(self):
        """Returns the label for a face and the path to its image.
        @return: (label, path)"""
        items = []
        for i in xrange(self._dataModel.rowCount()):
            label =  self._dataModel.index(i, 0).data(Qt.DisplayRole)
            imagePath = self._dataModel.index(i, 0).data(Qt.UserRole)
            clusterLabel = self._dataModel.index(i, 0).data(self.CLUSTER_ROLE)
            items.append((imagePath, label, clusterLabel))

        return items

    def addItem(self, label, imagePath):
        """Add an item to list view
        @param label: The label associated with the item.
        @param imagePath: Path to image for the icon."""
        if os.path.exists(imagePath):
            icon = QIcon(imagePath)
        else:
            icon = QIcon(':/res/Unknown-person.gif')

        item = QStandardItem(icon, label)
        item.setEditable(True)
        # Add image path to the UserRole field.
        item.setData(imagePath, Qt.UserRole)
        # Add cluster label to image. CLUSTER_ROLE is where I intend
        # to put the item's cluster label.
        item.setData(self.UNCLUSTERED_LABEL, self.CLUSTER_ROLE)
        # Prevent an item from dropping into another item.
        item.setDropEnabled(False)
        # Add item to list indirectly by adding it to the model.
        self._dataModel.appendRow(item)

    def clear(self):
        self._dataModel.clear()

这没有什么错，你发布的代码。所以一定有什么问题你如何使用它。你是如何产生的集群标签？

下面是使用你的测试脚本FacesView的排序按预期类：

from random import randint
from PySide.QtGui import QWidget, QPushButton, QVBoxLayout, QApplication
from facesview import FacesView

class Window(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        self.list = FacesView(self)
        self.button = QPushButton('Test', self)
        self.button.clicked.connect(self.handleButton)
        layout = QVBoxLayout(self)
        layout.addWidget(self.list)
        layout.addWidget(self.button)

    def handleButton(self):
        labels = []
        self.list.model().setRowCount(0)
        for row in range(10):
            labels.append(randint(0, 3))
            text = 'Item(%d) - Cluster(%d)' % (row, labels[-1])
            self.list.addItem(text, 'icon.png')
        self.list.updateFaceClusters(labels)

if __name__ == '__main__':

    import sys
    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())