控件拖拽和剪贴板

拖拽

'''
让控件支持拖拽动作
A.setDragEnabled(True)

B.setAcceptDrops(True)

B需要两个事件
1. dragEnterEvent   将A拖到B触发
2. dropEvent        在B的区域放下A时触发


'''

import sys,math
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

class MyComboBox(QComboBox) :
    def __init__(self):
        super(MyComboBox,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 DrapDropDemo(QWidget):
    def __init__(self):
        super(DrapDropDemo,self).__init__()
        formLayout = QFormLayout()
        formLayout.addRow(QLabel("请将左边的文本拖拽到右边的下拉列表中"))
        lineEdit = QLineEdit()
        lineEdit.setDragEnabled(True)  # 让QLineEdit控件可拖动

        combo = MyComboBox()
        formLayout.addRow(lineEdit,combo)
        self.setLayout(formLayout)
        self.setWindowTitle('拖拽案例')
if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = DrapDropDemo()
    main.show()
    sys.exit(app.exec_())

QMimeData类提为数据提供一个容器，用来记录关于MIME类型数据的信息
QMimeData常用来描述保存在剪切板里信息，或者拖拽原理
QMimeData对象把它所保存的信息和正确的MIME类型连接起来来保证信息可以被安全的在应用程序之间转移，或者在同一个应用程序之间拷贝

---

剪贴板

'''
使用剪贴板


'''

import sys,math
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
class ClipBoard(QDialog):
    def __init__(self):
        super(ClipBoard,self).__init__()
        textCopyButton = QPushButton('复制文本')
        textPasteButton = QPushButton('粘贴文本')

        htmlCopyButton = QPushButton('复制HTML')
        htmlPasteButton = QPushButton('粘贴HTML')

        imageCopyButton = QPushButton('复制图像')
        imagePasteButton = QPushButton('粘贴图像')

        self.textLabel  = QLabel('默认文本')
        self.imageLabel=QLabel()
      #  self.imageLabel.setPixmap(QPixmap('./images/book1.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(htmlPasteButton,1,1)
        layout.addWidget(imagePasteButton,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)
        htmlCopyButton.clicked.connect(self.copyHtml)
        htmlPasteButton.clicked.connect(self.pasteHtml)
        imageCopyButton.clicked.connect(self.copyImage)
        imagePasteButton.clicked.connect(self.pasteImage)

        self.setWindowTitle('剪贴板演示')

    def copyText(self):
        clipboard = QApplication.clipboard()
        clipboard.setText('hello world')
    def pasteText(self):
        clipboard = QApplication.clipboard()
        self.textLabel.setText(clipboard.text())

    def copyImage(self):
        clipboard = QApplication.clipboard()
        clipboard.setPixmap(QPixmap('./images/book.png'))

    def pasteImage(self):
        clipboard = QApplication.clipboard()
        self.imageLabel.setPixmap(clipboard.pixmap())

    def copyHtml(self):
        mimeData = QMimeData()
        mimeData.setHtml('<b>Bold and <font color=red>Red</font></b>')
        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)
    main = ClipBoard()
    main.show()
    sys.exit(app.exec_())