pyqt5:一个页面存在多个按钮，实现对各个按钮的拖动

男娘i 2022-03-19 15:22 630阅读 0赞

**一.对一个按钮进行拖动**

代码来自：https://www.jb51.net/article/138870.htm
    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.RightButton:
       return
     
      mimeData = QMimeData()
     
      drag = QDrag(self)
      drag.setMimeData(mimeData)
      drag.setHotSpot(e.pos() - self.rect().topLeft())
     
      dropAcion = 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_()

但是这只能实现对一个按钮的拖动，现在要做修改，使能实现对多个按钮的拖动，首先，先添加几个按钮，分别命名为do,re,mi,fa：

def initUI(self):
            self.setAcceptDrops(True)
    
            self.button1 = Button("do", self)
            self.button1.move(50, 20)
    
            self.button2 = Button("re", self)
            self.button2.move(150, 20)
    
            self.button3 = Button("mi", self)
            self.button3.move(50, 50)
    
            self.button4 = Button("fa", self)
            self.button4.move(150, 50)
    
            self.setWindowTitle("Click or Move")
            self.setGeometry(300, 300, 280, 150)

然后在dropEvent函数中添加if-elif条件表达式：

def dropEvent(self, e):
            position = e.pos()
            if self.button1.isDown():
                self.button1.move(position)
            elif self.button2.isDown():
                self.button2.move(position)
            elif self.button3.isDown():
                self.button3.move(position)
            elif self.button4.isDown():
                self.button4.move(position)
    
            e.setDropAction(Qt.MoveAction)
            e.accept()

还有，把Button类的mouseMoveEvent()方法中if语句中的return 改成一个print()(我也不知为啥，反正这样才能正常操作)

其余地方无需修改，就可以实现对多个按钮的拖动，完整代码如下：

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.RightButton:
                print('')
    
            mimeData = QMimeData()
    
            drag = QDrag(self)
            drag.setMimeData(mimeData)
            drag.setHotSpot(e.pos() - self.rect().topLeft())
    
            dropAcion = drag.exec_(Qt.MoveAction)
    
    
    class Example(QWidget):
        def __init__(self):
            super().__init__()
            self.initUI()
    
        def initUI(self):
            self.setAcceptDrops(True)
    
            self.button1 = Button("do", self)
            self.button1.move(50, 20)
    
            self.button2 = Button("re", self)
            self.button2.move(150, 20)
    
            self.button3 = Button("mi", self)
            self.button3.move(50, 50)
    
            self.button4 = Button("fa", self)
            self.button4.move(150, 50)
    
            self.setWindowTitle("Click or Move")
            self.setGeometry(300, 300, 280, 150)
    
        def dragEnterEvent(self, e):
            e.accept()
    
    
        def dropEvent(self, e):
            position = e.pos()
            if self.button1.isDown():
                self.button1.move(position)
            elif self.button2.isDown():
                self.button2.move(position)
            elif self.button3.isDown():
                self.button3.move(position)
            elif self.button4.isDown():
                self.button4.move(position)
    
            e.setDropAction(Qt.MoveAction)
            e.accept()
    
    
    if __name__ == "__main__":
        app = QApplication(sys.argv)
        ex = Example()
        ex.show()
        app.exec_()