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通常,我们可以拖放两件事:数据或一些图形对象。如果我们把一个图像从一个应用程序到另一个地方,我们拖拽二进制数据。如果我们把一个标签在Firefox中并将其移动到另一个地方,我们拖拽一个图形组件

文本拖放

输入文本后拖拽到button

import sysfrom PyQt5.QtWidgets import (QPushButton, QWidget,                             QLineEdit, QApplication)class Button(QPushButton):    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())class Example(QWidget):    def __init__(self):        super().__init__()        self.initUI()    def initUI(self):        edit = QLineEdit('', self)        edit.setDragEnabled(True)        edit.move(30, 65)        button = Button("drag here", self)        button.move(190, 65)        self.setWindowTitle('Simple drag & drop')        self.setGeometry(300, 300, 300, 150)if __name__ == '__main__':    app = QApplication(sys.argv)    ex = Example()    ex.show()    app.exec_()

import sysfrom PyQt5.QtWidgets import QPushButton, QWidget, QApplicationfrom PyQt5.QtCore import Qt, QMimeDatafrom PyQt5.QtGui import QDrag  class Button(QPushButton):    def __init__(self, title, parent):        super().__init__(title, parent)     def mouseMoveEvent(self, e):         if e.buttons() != Qt.RightButton:            return         mimeData = QMimeData()         drag = QDrag(self)        drag.setMimeData(mimeData)        drag.setHotSpot(e.pos() - self.rect().topLeft())         dropAction = drag.exec_(Qt.MoveAction)     def mousePressEvent(self, e):         QPushButton.mousePressEvent(self, e)         if e.button() == Qt.LeftButton:            print('press')  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_()

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