PyQt5使用mimeData实现拖拽事件教程示例解析上

# -*- coding: utf-8 -*-
import sys
from PyQt5.QtCore import Qt, QMimeData
from PyQt5.QtGui import QDrag
from PyQt5.QtWidgets import QWidget, QLineEdit, QApplication, QSplitter, QHBoxLayout
class MyLineEdit(QLineEdit):
    def __init__(self, parent):
        super().__init__(parent)
        self.setAcceptDrops(True)
    def dragMoveEvent(self, event):
        drag = QDrag(self)
        mime = QMimeData()
        drag.setMimeData(mime)
        drag.exec(Qt.CopyAction)
    def dragEnterEvent(self, event):
        if event.mimeData().hasText():
            event.accept()
        else:
            event.ignore()
    def dropEvent(self, event):
        self.setText(event.mimeData().text())
        event.source().setText("")
class SimpleDrag(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        hlayout = QHBoxLayout(self)
        edit1 = MyLineEdit(self)
        edit1.setDragEnabled(True)
        edit2 = MyLineEdit(self)
        edit2.setDragEnabled(True)
        splitter = QSplitter(Qt.Horizontal)
        splitter.addWidget(edit1)
        splitter.addWidget(edit2)
        hlayout.addWidget(splitter)
        self.setLayout(hlayout)
        self.setWindowTitle('简易的拖动事件')
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = SimpleDrag()
    ex.show()
    app.exec_()

# -*- coding: utf-8 -*-
import sys
from PyQt5.QtWidgets import QPushButton, QWidget, QApplication
from PyQt5.QtCore import Qt, QMimeData
from PyQt5.QtGui import QDrag
class Button(QPushButton):
    def __init__(self, title, parent):
        super().__init__(title, parent)
    def mouseMoveEvent(self, e):
        if e.buttons() != Qt.LeftButton:
            return
        mimeData = QMimeData()
        drag = QDrag(self)
        drag.setMimeData(mimeData)
        drag.setHotSpot(e.pos() - self.rect().topLeft())
        drag.exec_(Qt.MoveAction)
class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        self.setAcceptDrops(True)
        self.button = Button('Button', self)
        self.button.move(100, 65)
        self.setWindowTitle('Click or Move')
        self.setGeometry(300, 300, 280, 150)
    def dragEnterEvent(self, e):
        e.accept()
    def dropEvent(self, e):
        position = e.pos()
        self.button.move(position)
        e.setDropAction(Qt.MoveAction)
        e.accept()
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    ex.show()
    app.exec_()