PyQt5 拖放

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QLineEdit, QLabel
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot

class App(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 drag and drop - tastones.com'
        self.left = 10
        self.top = 10
        self.width = 320
        self.height = 60
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        editBox = QLineEdit('Drag this', self)
        editBox.setDragEnabled(True)
        editBox.move(10, 10)
        editBox.resize(100,32)

        button = CustomLabel('Drop here.', self)
        button.move(130,15)

        self.show()

    @pyqtSlot()
    def on_click(self):
        print('PyQt5 button click')

class CustomLabel(QLabel):

    def __init__(self, title, parent):
        super().__init__(title, parent)
        self.setAcceptDrops(True)

    def dragEnterEvent(self, e):
        if e.mimeData().hasFormat('text/plain'):
            e.accept()
        else:
            e.ignore()

    def dropEvent(self, e):
        self.setText(e.mimeData().text())

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())