Swing Sampler

SwingExamples

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From: Jeff Emanuel <jemanuel <at> frii.com>BR Subject: Re: Tranlating a simple Java editor into JythonBR Newsgroups: gmane.comp.lang.jython.userBR Date: 2007-03-24 19:07:37 GMTBR BR Anton Vredegoor wrote:BR BR > Hello All,BR > BR > I'm an experienced Python programmer with only a very basic BR > understanding of Java. I'm currently trying to translate this veryBR > simple Java editor into Jython.BR > Any hints or complete or partial translations of BR > the code are very welcome.BR > http://leepoint.net/notes-java/examples/components/editor/nutpad.html[[BR]] > BR Heres a quick translation. For the Java inner classes,BR translate them to top level classes that take the outer instanceBR as a constructor argument. Java inner classes have an implicitBR pointer to the enclosing class instance. You must make thatBR explicit.BR BR

from java.awt import *
from java.awt.event import *
from javax.swing import *
from java.io import *
from java.lang import System,Integer
 
#/////////////////////////////////////////////////////////////////////// NutPad
class NutPad(JFrame):
   #... Components
   _editArea=None
   _fileChooser = JFileChooser()
 
   #============================================================== constructor
   def __init__(self):
 
     #... Create actions for menu items, buttons, ...
     self._openAction = OpenAction(self)
     self._saveAction = SaveAction(self)
     self._exitAction = ExitAction(self)
 
     #... Create scrollable text area.
     self._editArea = JTextArea(15, 80)
     self._editArea.border=BorderFactory.createEmptyBorder(2,2,2,2)
     self._editArea.font=Font("monospaced", Font.PLAIN, 14)
     scrollingText = JScrollPane(self._editArea)
 
     #-- Create a content pane, set layout, add component.
     content = JPanel()
     content.setLayout(BorderLayout())
     content.add(scrollingText, BorderLayout.CENTER);
 
     #... Create menubar
     menuBar = JMenuBar()
     fileMenu = menuBar.add(JMenu("File"))
     fileMenu.setMnemonic('F')
     fileMenu.add(self._openAction)       # Note use of actions, not text.
     fileMenu.add(self._saveAction)
     fileMenu.addSeparator()
     fileMenu.add(self._exitAction)
 
     #... Set window content and menu.
     self.setContentPane(content)
     self.setJMenuBar(menuBar)
 
     #... Set other window characteristics.
     self.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
     self.setTitle("NutPad")
     self.pack()
     self.setLocationRelativeTo(None)
     self.visible=1
 
#//////////////////////////////////////////////// inner class OpenAction
class OpenAction(AbstractAction):
   #============================================= constructor
   def __init__(self,outer):  # outer instance.
     AbstractAction.__init__(self,"Open...")
     self.outer=outer
     self.putValue(AbstractAction.MNEMONIC_KEY, Integer(ord('O')))
 
   #========================================= actionPerformed
   def actionPerformed(self, e):
     retval = self.outer._fileChooser.showOpenDialog(self.outer)
     if retval==JFileChooser.APPROVE_OPTION:
       f = self.outer._fileChooser.getSelectedFile()
       try:
         reader = FileReader(f)
         self.outer._editArea.read(reader, "")  # Use TextComponent read
       except IOException,ioex:
         System.out.println(e);
         System.exit(1);
 
#////////////////////////////////////////////////// inner class SaveAction
class SaveAction(AbstractAction):
   #============================================= constructor
   def __init__(self,outer):
     AbstractAction.__init__(self,"Save...")
     self.outer=outer
     self.putValue(AbstractAction.MNEMONIC_KEY, Integer(ord('S')))
 
   #========================================= actionPerformed
   def actionPerformed(self, e):
     retval = self.outer._fileChooser.showSaveDialog(self.outer)
     if retval == JFileChooser.APPROVE_OPTION:
       f = self.outer._fileChooser.getSelectedFile()
       try:
         writer = FileWriter(f)
         self.outer._editArea.write(writer)  # TextComponent write
       except IOException,ioex:
         JOptionPane.showMessageDialog(self.outer, ioex)
         System.exit(1)
 
#/////////////////////////////////////////////////// inner class ExitAction
class ExitAction(AbstractAction):
 
   #============================================= constructor
   def __init__(self,outer):
     AbstractAction.__init__(self,"Exit")
     self.outer=outer
     self.putValue(AbstractAction.MNEMONIC_KEY, Integer(ord('X')))
 
   #========================================= actionPerformed
   def actionPerformed(self, e):
     System.exit(0);
 
#===================================================================== main
if __name__=="__main__":
   NutPad()