c/c++语言开发共享PyQt5使用mimeData实现拖拽事件教程示例解析上

目录

• 实现思路
• 1、简要介绍qmimedata
• 一、qdrag
• 二、drag相关事件
• 三、dropevent
• 四、拖放关键逻辑图
• 2、qmimedata的用例1
• 在qt实现输入框的文字拖拽
• 3、qmimedata的用例2
• 在qt实现按钮拖动

  # -*- coding: utf-8 -*-  import sys  from pyqt5.qtcore import qt, qmimedata  from pyqt5.qtgui import qdrag  from pyqt5.qtwidgets import qwidget, qlineedit, qapplication, qsplitter, qhboxlayout  class mylineedit(qlineedit):      def __init__(self, parent):          super().__init__(parent)          self.setacceptdrops(true)      def dragmoveevent(self, event):          drag = qdrag(self)          mime = qmimedata()          drag.setmimedata(mime)          drag.exec(qt.copyaction)      def dragenterevent(self, event):          if event.mimedata().hastext():              event.accept()          else:              event.ignore()      def dropevent(self, event):          self.settext(event.mimedata().text())          event.source().settext("")  class simpledrag(qwidget):      def __init__(self):          super().__init__()          self.initui()      def initui(self):          hlayout = qhboxlayout(self)          edit1 = mylineedit(self)          edit1.setdragenabled(true)          edit2 = mylineedit(self)          edit2.setdragenabled(true)          splitter = qsplitter(qt.horizontal)          splitter.addwidget(edit1)          splitter.addwidget(edit2)          hlayout.addwidget(splitter)          self.setlayout(hlayout)          self.setwindowtitle('简易的拖动事件')  if __name__ == '__main__':      app = qapplication(sys.argv)      ex = simpledrag()      ex.show()      app.exec_()  

  # -*- coding: utf-8 -*-  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.leftbutton:              return          mimedata = qmimedata()          drag = qdrag(self)          drag.setmimedata(mimedata)          drag.sethotspot(e.pos() - self.rect().topleft())          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_()