PySide学习笔记第十一章－PySide中的拖拽（放）操作

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在GUI编程中，拖拽操作即在不同的应用间拖拽对象以实现对象的移动

1、简单的拖拽

为了实现将行编辑器中的文本拖拽到按钮上，我们必须重写一些方法，所以我们在继承QtGui.QPushButton的基础上创造我们自己的BUTTON类

# -*- coding: utf-8 -*-"""ZetCode PySide tutorialThis is a simple drag anddrop example.author: Jan Bodnarwebsite: zetcode.comlast edited: August 2011"""import sysfrom PySide import QtGui, QtCoreclass Button(QtGui.QPushButton): # 定义Button类,以实现拖拽操作    def __init__(self, title, parent):        super(Button, self).__init__(title, parent)        self.setAcceptDrops(True)    def dragEnterEvent(self, e): # 重写 拖 函数,定义好我们要接受的数据类型        if e.mimeData().hasFormat('text/plain'):            e.accept()        else:            e.ignore()    def dropEvent(self, e): # 重写 放 函数,具体实现一个改变按钮的文本的操作        self.setText(e.mimeData().text())class Example(QtGui.QWidget):    def __init__(self):        super(Example, self).__init__()        self.initUI()    def initUI(self):        qe = QtGui.QLineEdit('', self)        qe.setDragEnabled(True)        qe.move(30, 65)        button = Button("Button", self)        button.move(190, 65)        self.setGeometry(300, 300, 300, 150)        self.setWindowTitle('Simple Drag & Drop')        self.show()def main():    app = QtGui.QApplication(sys.argv)    ex = Example()    sys.exit(app.exec_())if __name__ == '__main__':    main()

二、在下面的示例中，我们会证明如何拖拽一个button，在本示例中，点击左键会显示 ‘press’，按压住右键可以拖拽按钮

# -*- coding: utf-8 -*-"""ZetCode PySide tutorialIn this example, we drag and drop abutton.author: Jan Bodnarwebsite: zetcode.comlast edited: August 2011"""import sysfrom PySide import QtGui, QtCoreclass Button(QtGui.QPushButton):    def __init__(self, title, parent):        super(Button, self).__init__(title, parent)    def mouseMoveEvent(self, e):        if e.buttons() != QtCore.Qt.RightButton:            return        mimeData = QtCore.QMimeData()        drag = QtGui.QDrag(self)        drag.setMimeData(mimeData)        drag.setHotSpot(e.pos() - self.rect().topLeft())        dropAction = drag.start(QtCore.Qt.MoveAction)    def mousePressEvent(self, e):        QtGui.QPushButton.mousePressEvent(self, e)        if e.button() == QtCore.Qt.LeftButton:            print 'press'class Example(QtGui.QWidget):    def __init__(self):        super(Example, self).__init__()        self.initUI()    def initUI(self):        self.setAcceptDrops(True)        self.btn = Button('Button', self)        self.btn.move(100, 65)        self.setGeometry(300, 300, 300, 150)        self.setWindowTitle('Click or move')        self.show()    def dragEnterEvent(self, e):        e.accept()    def dropEvent(self, e):        position = e.pos()        self.btn.move(position)        e.setDropAction(QtCore.Qt.MoveAction)        e.accept()def main():    app = QtGui.QApplication(sys.argv)    ex = Example()    sys.exit(app.exec_())if __name__ == '__main__':    main()

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