Hi tutors,
I am a newb. Please bear with my simple question. Please refer to the code
as following. The question is: what is the special meaning of 'e' variable
in the class of 'Button'. The second one is how function 'dragEnterEvent'
and 'dropEvent' got executed with calling from class 'example'. Thanks a
lot for the help.
Best,
Yong
The code is here:
#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
ZetCode PyQt4 tutorial
This is a simple drag and
drop example.
author: Jan Bodnar
website: zetcode.com
last edited: December 2010
"""
import sys
from PyQt4 import QtGui
class Button(QtGui.QPushButton):
def __init__(self, title, parent):
super(Button, self).__init__(title, parent)
self.setAcceptDrops(True)
def dragEnterEvent(self, e):
if e.mimeData().hasFormat('text/plain'):
e.accept()
else:
e.ignore()
def dropEvent(self, e):
self.setText(e.mimeData().text())
class Example(QtGui.QWidget):
def __init__(self):
super(Example, self).__init__()
self.initUI()
def initUI(self):
edit = QtGui.QLineEdit('', self)
edit.setDragEnabled(True)
edit.move(30, 65)
button = Button("Button", self)
button.move(190, 65)
self.setWindowTitle('Simple Drag & Drop')
self.setGeometry(300, 300, 300, 150)
def main():
app = QtGui.QApplication(sys.argv)
ex = Example()
ex.show()
app.exec_()
if __name__ == '__main__':
main()
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