拖拽与剪切板

• 拖拽
• 剪贴板

拖拽

基于MIME类型的拖拽数据传输时基于QDrag类的QMimeData对象管理的数据与其对应的MIME类型相关联。
MimeData类函数允许检测和使用方法的MIME类型

常用拖拽事件

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import Qtclass Combo(QComboBox):def __init__(self, title, parent):super(Combo, self).__init__(parent)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 Example(QWidget):def __init__(self):super(Example, self).__init__()self.initUI()def initUI(self):lo = QFormLayout()lo.addRow(QLabel("请把左边的文本拖拽到右边的下拉菜单中"))edit = QLineEdit()edit.setDragEnabled(True)com = Combo("Button", self)lo.addRow(edit, com)self.setLayout(lo)self.setWindowTitle("简单的拖拽例子")if __name__ == "__main__":app = QApplication(sys.argv)win = Example()win.show()sys.exit(app.exec_())

剪贴板

QClipboard类提供了对系统剪贴板的访问，可以在应用程序之间复制和粘贴数据。它的操作类似于QDrag类，并使用类似的数据类型。
QApplication类有一个静态方法clipboard()，返回剪贴板对象的引用。任何类型的MimeData都可以从剪贴板复制或粘贴。
QClipboard常用方法

QClipboard类中的常用信号

import os
import sys
from PyQt5.QtCore import QMimeData
from PyQt5.QtWidgets import (QApplication, QDialog, QGridLayout, QLabel, QPushButton)
from PyQt5.QtGui import QPixmapclass Form(QDialog):def __init__(self, parent=None):super(Form, self).__init__(parent)textCopyButton = QPushButton("&Copy Text")textPasteButton = QPushButton("Paste &Text")htmlCopyButton = QPushButton("C&opy HTML")htmlPasteButton = QPushButton("Paste &HTML")imageCopyButton = QPushButton("Co&py Image")imagePasteButton = QPushButton("Paste &Image")self.textLabel = QLabel("Original text")self.imageLabel = QLabel()self.imageLabel.setPixmap(QPixmap(os.path.join(os.path.dirname(__file__), "images/clock.png")))layout = QGridLayout()layout.addWidget(textCopyButton, 0, 0)layout.addWidget(imageCopyButton, 0, 1)layout.addWidget(htmlCopyButton, 0, 2)layout.addWidget(textPasteButton, 1, 0)layout.addWidget(imagePasteButton, 1, 1)layout.addWidget(htmlPasteButton, 1, 2)layout.addWidget(self.textLabel, 2, 0, 1, 2)layout.addWidget(self.imageLabel, 2, 2)self.setLayout(layout)textCopyButton.clicked.connect(self.copyText)textPasteButton.clicked.connect(self.pasteText)imageCopyButton.clicked.connect(self.copyImage)imagePasteButton.clicked.connect(self.pasteImage)htmlCopyButton.clicked.connect(self.copyHtml)htmlPasteButton.clicked.connect(self.pasteHtml)def copyText(self):print(os.path.join(os.path.dirname(__file__)))clipboard = QApplication.clipboard()clipboard.setText("I've been clipped")def pasteText(self):clipboard = QApplication.clipboard()self.textLabel.setText(clipboard.text())def copyImage(self):clipboard = QApplication.clipboard()clipboard.setPixmap(QPixmap(os.path.join(os.path.dirname(__file__), "images/python.jpg")))def pasteImage(self):clipboard = QApplication.clipboard()self.imageLabel.setPixmap(clipboard.pixmap())def copyHtml(self):mimeData = QMimeData()mimeData.setHtml("Bold andRed")clipboard = QApplication.clipboard()clipboard.setMimeData(mimeData)def pasteHtml(self):clipboard = QApplication.clipboard()mimeData = clipboard.mimeData()if mimeData.hasHtml():self.textLabel.setText(mimeData.html())if __name__ == "__main__":app = QApplication(sys.argv)win = Form()win.show()sys.exit(app.exec_())