1

我在对QListView我指定的字段中的使用值中的项目进行排序时遇到了一些问题。

基本上我想要做的是:

  1. 检测照片集合中的人脸并将其显示在QListView
  2. 聚类人脸(图像)
  3. 通过将列表中属于同一集群的项目(它们是面部图像)放在一起来更新视图。具体来说,如果项目 1、3、5 在一个集群中,而项目 2、4、6 在另一个集群中,则项目 1、3、5 应该在显示项目 2、4、6 之前显示(以任何排列方式)或相反亦然。

我这样做的方法是将列表中的UserRole每个字段设置为QStandardItem集群标签,然后尝试QStandardModel根据 this 进行排序UserRole。然后,这将显示同一集群中的项目(即在 中具有相同的集群标签UserRole)彼此相邻。

我能够为UserRole项目设置成功,但调用排序函数QStandardModel并没有对项目进行排序,即使我将排序角色设置为默认值DisplayRole(即根据每个面的文本标签排序)它的工作方式为故意的。

谁能告诉我我的代码有什么问题或提供替代方法?我用谷歌搜索了排序列表,并在QSortFilterProxyModel上找到了以下链接,但由于我对 Qt 很陌生,因此无法适应我的情况。

提前感谢任何回复。

以下是相关代码:

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()
4

1 回答 1

1

您发布的代码没有任何问题。所以你使用它的方式一定有问题。你是如何生成集群标签的?

这是一个使用您的FacesView类的测试脚本,它按照您的意图进行排序:

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_())
于 2012-10-14T17:29:16.580 回答