PyQt5 QSpinbox - 从中拖动文本并将其拖放到自定义标签

在本文中，我们将看到如何使用光标将旋转框的文本拖放到给定的自定义标签上。拖放文本类似于将文件夹从一个目录拖放到另一个目录，当我们这样做时，会生成它的另一个副本。

In order to do this we have to do the following :

1. Create a spin box
2. Get the line edit object of the spin box
3. Make drag enable to the line edit object
4. Create a new class for the custom label which inherits QLabel class
5. Allow this class to accept drops
6. Add drag and drop event to it so that it can receive the text and show the text

自定义标签类的语法

class CustomLabel(QLabel):
    # constructor
    def __init__(self, title, parent):
        super().__init__(title, parent)

        # enabling accept drops
        self.setAcceptDrops(True)

    # creating drag enter event to receive text
    def dragEnterEvent(self, e):

        # checking format of the text
        if e.mimeData().hasFormat('text/plain'):
            # accepting the text
            e.accept()

        else:
            # rejecting the text
            e.ignore()
    
    # drop event to showing the text to label
    def dropEvent(self, e):

        # setting text to the label
        self.setText(e.mimeData().text())

下面是实现

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for widgets
    def UiComponents(self):
        # creating spin box
        self.spin = QSpinBox(self)
  
        # setting geometry to spin box
        self.spin.setGeometry(100, 100, 250, 40)
  
        # setting prefix to spin
        self.spin.setPrefix("Prefix ")
  
        # setting suffix to spin
        self.spin.setSuffix(" Suffix")
  
  
        # get the line edit object
        line = self.spin.lineEdit()
  
        # set drag enable to true
        line.setDragEnabled(True)
  
        # creating a CustomLabel object
        label = CustomLabel('Drop here.', self)
  
        # setting geometry to the label
        label.setGeometry(100, 200, 300, 30)
  
  
class CustomLabel(QLabel):
    # constructor
    def __init__(self, title, parent):
        super().__init__(title, parent)
  
        # enabling accept drops
        self.setAcceptDrops(True)
  
    # creating drag enter event to receive text
    def dragEnterEvent(self, e):
  
        # checking format of the text
        if e.mimeData().hasFormat('text / plain'):
            # accepting the text
            e.accept()
  
        else:
            # rejecting the text
            e.ignore()
  
    # drop event to showing the text to label
    def dropEvent(self, e):
  
        # setting text to the label
        self.setText(e.mimeData().text())
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出 ：