python - 两个 QListView 框，一个显示文件夹中的文件，一个显示第一个 QListview 中选定的文件

Question

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *

class Widget(QWidget):
    def __init__(self, *args, **kwargs):
        QWidget.__init__(self, *args, **kwargs)
        hlay = QHBoxLayout(self)

        self.listview = QListView()
        self.listview2 = QListView()

        hlay.addWidget(self.listview)
        hlay.addWidget(self.listview2)

        path = r'C:\Users\Desktop\Project'

        self.fileModel = QFileSystemModel()
        self.fileModel.setFilter(QDir.NoDotAndDotDot | QDir.Files)

        self.listview.setRootIndex(self.fileModel.index(path))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

我想用代码中描述的路径显示文件夹中 ListView 中的文件，并且能够选择它们，我选择的文件将显示在我的listview2中，但是，listview不显示该路径中的文件。谁能帮我解决一下吗？

Answer 1

由于您尚未在 QFileSystemModel 中设置 rootPath，因此未显示文件。

另一方面，第二个 QListView 必须具有一个模型，其中在选择或取消选择项目时添加或删除项目，为此，您必须使用 selectionChanged 信号第一个 QListView 的 selectionModel()，该信号传输选定和取消选定项目的信息。

要更改颜色，您必须获取 QStandardItem 并将 setData() 方法与 Qt::BackgroundRole 角色一起使用。在示例中，每秒颜色随机变化

import sys
import random
from PyQt5 import QtCore, QtGui, QtWidgets


class Widget(QtWidgets.QWidget):
    def __init__(self, *args, **kwargs):
        super(Widget, self).__init__(*args, **kwargs)
        self.listview = QtWidgets.QListView()
        self.listview2 = QtWidgets.QListView()

        path = r'C:\Users\Desktop\Project'

        self.fileModel = QtWidgets.QFileSystemModel(self)
        self.fileModel.setRootPath(path)
        self.fileModel.setFilter(QtCore.QDir.NoDotAndDotDot | QtCore.QDir.Files)
        self.listview.setModel(self.fileModel)
        self.listview.setRootIndex(self.fileModel.index(path))
        self.listview.selectionModel().selectionChanged.connect(self.on_selectionChanged)
        self.listview.setSelectionMode(QtWidgets.QAbstractItemView.ExtendedSelection)

        self.model = QtGui.QStandardItemModel(self)
        self.listview2.setModel(self.model)

        hlay = QtWidgets.QHBoxLayout(self)
        hlay.addWidget(self.listview)
        hlay.addWidget(self.listview2)

        timer = QtCore.QTimer(self, interval=1000, timeout=self.test_color)
        timer.start()

    def on_selectionChanged(self, selected, deselected):
        roles = (QtCore.Qt.DisplayRole, 
                 QtWidgets.QFileSystemModel.FilePathRole,
                 QtWidgets.QFileSystemModel.FileNameRole,
                 QtCore.Qt.DecorationRole)

        for ix in selected.indexes():
            it = QtGui.QStandardItem(ix.data())
            for role in roles:
                it.setData(ix.data(role), role)
            it.setData(QtGui.QColor("green"), QtCore.Qt.BackgroundRole)
            self.model.appendRow(it)

        filter_role = QtWidgets.QFileSystemModel.FilePathRole
        for ix in deselected.indexes():
            for index in self.model.match(ix.parent(), filter_role, ix.data(filter_role), -1, QtCore.Qt.MatchExactly):
                self.model.removeRow(index.row())

    def test_color(self):
        if self.model.rowCount() > 0:
            n_e = random.randint(0, self.model.rowCount())
            rows_red = random.sample(range(self.model.rowCount()), n_e)
            for row in range(self.model.rowCount()):
                it = self.model.item(row)
                if row in rows_red:
                    it.setData(QtGui.QColor("red"), QtCore.Qt.BackgroundRole)
                else:
                    it.setData(QtGui.QColor("green"), QtCore.Qt.BackgroundRole)

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())