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from PyQt5.QtWidgets import *from PyQt5.QtGui import *from PyQt5.QtCore import *import sysclass Mycombox(QComboBox):    def __init__(self):        super(Mycombox, self).__init__()        self.setAcceptDrops(True)    def dragEnterEvent(self, e):        print(e)        if e.mimeData().hasText():            e.accept()        else:            e.ignore()    def dropEvent(self, e):        self.addItem(e.mimeData().text())class DropDemo(QWidget):    def __init__(self):        super(DropDemo, self).__init__()        layout = QFormLayout()        layout.addRow(QLabel('请将左边的文本拖到右边显示'))        lineEdit = QLineEdit()        lineEdit.setDragEnabled(True)        combo =Mycombox()        layout.addRow(lineEdit,combo)        self.setLayout(layout)        self.setWindowTitle('拖拽案例')if __name__ == '__main__':    app =QApplication(sys.argv)    main = DropDemo()    main.show()    app.exit(app.exec_())

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