PyQt4教程系列三：扩展功能

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *

def window():
   app = QApplication(sys.argv)
   w = QWidget()
   b = QPushButton(w)
   b.setText("Hello World!")
   b.move(50,50)
   b.clicked.connect(showdialog)
   w.setWindowTitle("PyQt Dialog demo")
   w.show()
   sys.exit(app.exec_())
	
def showdialog():
   d = QDialog()
   b1 = QPushButton("ok",d)
   b1.move(50,50)
   d.setWindowTitle("Dialog")
   d.setWindowModality(Qt.ApplicationModal)  # 这里设置模态与否
   d.exec_()
	
if __name__ == '__main__':
   window()

mport sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *

def window():
   app = QApplication(sys.argv)
   w = QWidget()
   b = QPushButton(w)
   b.setText("Show message!")

   b.move(50,50)
   b.clicked.connect(showdialog)
   w.setWindowTitle("PyQt Dialog demo")
   w.show()
   sys.exit(app.exec_())
	
def showdialog():
   msg = QMessageBox()
   msg.setIcon(QMessageBox.Information)

   msg.setText("This is a message box")
   msg.setInformativeText("This is additional information")
   msg.setWindowTitle("MessageBox demo")
   msg.setDetailedText("The details are as follows:")
   msg.setStandardButtons(QMessageBox.Ok | QMessageBox.Cancel)
   msg.buttonClicked.connect(msgbtn)
	
   retval = msg.exec_()
   print "value of pressed message box button:", retval
	
def msgbtn(i):
   print "Button pressed is:",i.text()
	
if __name__ == '__main__': 
   window()

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class MainWindow(QMainWindow):
   count = 0
	
   def __init__(self, parent = None):
      super(MainWindow, self).__init__(parent)
      self.mdi = QMdiArea()
      self.setCentralWidget(self.mdi)
      bar = self.menuBar()
		
      file = bar.addMenu("File")
      file.addAction("New")
      file.addAction("cascade")
      file.addAction("Tiled")
      file.triggered[QAction].connect(self.windowaction)
      self.setWindowTitle("MDI demo")
		
   def windowaction(self, q):
      print "triggered"
		
      if q.text() == "New":
         MainWindow.count = MainWindow.count+1
         sub = QMdiSubWindow()
         sub.setWidget(QTextEdit())
         sub.setWindowTitle("subwindow"+str(MainWindow.count))
         self.mdi.addSubWindow(sub)
         sub.show()
   		
      if q.text() == "cascade":
         self.mdi.cascadeSubWindows()
   		
      if q.text() == "Tiled":
         self.mdi.tileSubWindows()
   		
def main():
   app = QApplication(sys.argv)
   ex = MainWindow()
   ex.show()
   sys.exit(app.exec_())
	
if __name__ == '__main__':
   main()

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *

class combo(QComboBox):

   def __init__(self, title, parent):
      super(combo, self).__init__( parent)
	
      self.setAcceptDrops(True)
		
   def dragEnterEvent(self, e):
      print e
		
      if e.mimeData().hasText():
         e.accept()
      else:
         e.ignore()
			
   def dropEvent(self, e):
      self.addItem(e.mimeData().text())
		
class Example(QWidget):

   def __init__(self):
      super(Example, self).__init__()
		
      self.initUI()
		
   def initUI(self):
      lo = QFormLayout()
      lo.addRow(QLabel("Type some text in textbox and drag it into combo box"))
		
      edit = QLineEdit()
      edit.setDragEnabled(True)
      com = combo("Button", self)
      lo.addRow(edit,com)
      self.setLayout(lo)
      self.setWindowTitle('Simple drag & drop')
		
def main():
   app = QApplication(sys.argv)
   ex = Example()
   ex.show()
   app.exec_()
	
if __name__ == '__main__':
   main()