pyqt5中的拖放功能与自定义小部件一起创建内容不可见的小部件

Question

我正在尝试构建一个程序，该程序具有自定义小部件，可以从一个列表拖放到另一个列表中。自定义小部件是表单（标签/行编辑）。下面的代码具有大部分功能，但每当我拖放一个项目时，它都会为它创建空间，但无法看到小部件的内容。我尝试过使用setdropmode（）函数，但没有效果

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *

from PyQt5.QtWidgets import QApplication, QWidget, QListWidget, QVBoxLayout, QLabel, QPushButton, QListWidgetItem, \
    QHBoxLayout, QAbstractItemView
import os
import PyQt5
from PyQt5 import QtGui, QtWidgets, QtCore
from PyQt5.QtGui import QImage, QPixmap, QColor, QBrush, QFontDatabase, QStandardItem, QStandardItemModel, QIcon
from PyQt5.QtCore import QRect, QSize, Qt, QThread, QProcess

class CustomQWidget(QWidget):
    def __init__(self, parent=None):
        super(CustomQWidget, self).__init__(parent)

        formLayoutWidget = QtWidgets.QWidget()
        # formLayoutWidget.setGeometry(QtCore.QRect(139, 69, 291, 131))
        formLayoutWidget.setObjectName("formLayoutWidget")
        formLayout = QtWidgets.QFormLayout(formLayoutWidget)
        formLayout.setContentsMargins(0, 0, 0, 0)
        formLayout.setObjectName("formLayout")

        lineEdit = QtWidgets.QLineEdit(formLayoutWidget)
        lineEdit.setObjectName("lineEdit")
        formLayout.setWidget(0, QtWidgets.QFormLayout.FieldRole, lineEdit)

        lineEdit_2 = QtWidgets.QLineEdit(formLayoutWidget)
        lineEdit_2.setObjectName("lineEdit_2")
        formLayout.setWidget(1, QtWidgets.QFormLayout.FieldRole, lineEdit_2)

        lineEdit_3 = QtWidgets.QLineEdit(formLayoutWidget)
        lineEdit_3.setObjectName("lineEdit_3")
        formLayout.setWidget(2, QtWidgets.QFormLayout.FieldRole, lineEdit_3)

        label = QtWidgets.QLabel(formLayoutWidget)
        label.setObjectName("label")
        label.setText("TextLabel")
        formLayout.setWidget(0, QtWidgets.QFormLayout.LabelRole, label)

        label_2 = QtWidgets.QLabel(formLayoutWidget)
        label_2.setObjectName("label_2")
        label_2.setText("TextLabel")
        formLayout.setWidget(1, QtWidgets.QFormLayout.LabelRole, label_2)

        label_3 = QtWidgets.QLabel(formLayoutWidget)
        label_3.setObjectName("label_3")
        label_3.setText("TextLabel")
        formLayout.setWidget(2, QtWidgets.QFormLayout.LabelRole, label_3)

        self.setLayout(formLayout)

class Window(QWidget):
    def __init__(self):
        super().__init__()

        self.myListWidget1 = QListWidget()
        # self.myListWidget1.setViewMode(QListWidget.IconMode)

        self.myListWidget2 = QListWidget()
        self.myListWidget2.setViewMode(QListWidget.IconMode)
        self.myListWidget1.setAcceptDrops(False)
        self.myListWidget1.setDragEnabled(True)
        self.myListWidget2.setAcceptDrops(True)
        self.myListWidget2.setDragEnabled(True)
        self.myListWidget2.setGridSize( QSize( 130, 130 ) )
        self.myListWidget2.setMovement(2)
        self.setGeometry(300, 350, 990, 970)
        self.myLayout = QHBoxLayout()
        self.myLayout.addWidget(self.myListWidget1)
        self.myLayout.addWidget(self.myListWidget2)

        self.setFixedSize(self.size())

        self.item = QListWidgetItem(self.myListWidget1)
        self.item_widget = CustomQWidget()
        self.item.setSizeHint(self.item_widget.sizeHint())
        self.myListWidget1.addItem(self.item)
        self.myListWidget1.setItemWidget(self.item, self.item_widget)

        self.item2 = QListWidgetItem(self.myListWidget1)
        self.item_widget2 = CustomQWidget()
        self.item2.setSizeHint(self.item_widget2.sizeHint())
        self.myListWidget1.addItem(self.item2)
        self.myListWidget1.setItemWidget(self.item2, self.item_widget2)
        self.myListWidget1.setDragDropMode(QAbstractItemView.DragDrop)

        self.setWindowTitle('Drag and Drop Example');
        self.setLayout(self.myLayout)

        self.show()

App = QApplication(sys.argv)
window = Window()
sys.exit(App.exec())

Answer 1

您需要在小部件上实现dragEnterEvent和dropEvent

    def dragEnterEvent(self, event: QDragEnterEvent) -> None:
        if event.mimeData().hasUrls():
            event.accept()
        else:
            event.ignore()

    def dropEvent(self, event: QDropEvent) -> None:
        if event.mimeData().hasUrls():
            event.accept()