Swing Sampler
Contents
From: Jeff Emanuel <jemanuel <at> frii.com>
Subject: Re: Tranlating a simple Java editor into Jython
Newsgroups: gmane.comp.lang.jython.user
Date: 2007年03月24日 19:07:37 GMT
Anton Vredegoor wrote:
> Hello All,
>
> I'm an experienced Python programmer with only a very basic
> understanding of Java. I'm currently trying to translate this very
> simple Java editor into Jython.
> Any hints or complete or partial translations of
> the code are very welcome.
> http://leepoint.net/notes-java/examples/components/editor/nutpad.html[[BR]] >
Heres a quick translation. For the Java inner classes,
translate them to top level classes that take the outer instance
as a constructor argument. Java inner classes have an implicit
pointer to the enclosing class instance. You must make that
explicit.
1 from java.awt import *
2 from java.awt.event import *
3 from javax.swing import *
4 from java.io import *
5 from java.lang import System,Integer
6
7 #/////////////////////////////////////////////////////////////////////// NutPad
8 class NutPad(JFrame):
9 #... Components
10 _editArea=None
11 _fileChooser = JFileChooser()
12
13 #============================================================== constructor
14 def __init__(self):
15
16 #... Create actions for menu items, buttons, ...
17 self._openAction = OpenAction(self)
18 self._saveAction = SaveAction(self)
19 self._exitAction = ExitAction(self)
20
21 #... Create scrollable text area.
22 self._editArea = JTextArea(15, 80)
23 self._editArea.border=BorderFactory.createEmptyBorder(2,2,2,2)
24 self._editArea.font=Font("monospaced", Font.PLAIN, 14)
25 scrollingText = JScrollPane(self._editArea)
26
27 #-- Create a content pane, set layout, add component.
28 content = JPanel()
29 content.setLayout(BorderLayout())
30 content.add(scrollingText, BorderLayout.CENTER);
31
32 #... Create menubar
33 menuBar = JMenuBar()
34 fileMenu = menuBar.add(JMenu("File"))
35 fileMenu.setMnemonic('F')
36 fileMenu.add(self._openAction) # Note use of actions, not text.
37 fileMenu.add(self._saveAction)
38 fileMenu.addSeparator()
39 fileMenu.add(self._exitAction)
40
41 #... Set window content and menu.
42 self.setContentPane(content)
43 self.setJMenuBar(menuBar)
44
45 #... Set other window characteristics.
46 self.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
47 self.setTitle("NutPad")
48 self.pack()
49 self.setLocationRelativeTo(None)
50 self.visible=1
51
52 #//////////////////////////////////////////////// inner class OpenAction
53 class OpenAction(AbstractAction):
54 #============================================= constructor
55 def __init__(self,outer): # outer instance.
56 AbstractAction.__init__(self,"Open...")
57 self.outer=outer
58 self.putValue(AbstractAction.MNEMONIC_KEY, Integer(ord('O')))
59
60 #========================================= actionPerformed
61 def actionPerformed(self, e):
62 retval = self.outer._fileChooser.showOpenDialog(self.outer)
63 if retval==JFileChooser.APPROVE_OPTION:
64 f = self.outer._fileChooser.getSelectedFile()
65 try:
66 reader = FileReader(f)
67 self.outer._editArea.read(reader, "") # Use TextComponent read
68 except IOException,ioex:
69 System.out.println(e);
70 System.exit(1);
71
72 #////////////////////////////////////////////////// inner class SaveAction
73 class SaveAction(AbstractAction):
74 #============================================= constructor
75 def __init__(self,outer):
76 AbstractAction.__init__(self,"Save...")
77 self.outer=outer
78 self.putValue(AbstractAction.MNEMONIC_KEY, Integer(ord('S')))
79
80 #========================================= actionPerformed
81 def actionPerformed(self, e):
82 retval = self.outer._fileChooser.showSaveDialog(self.outer)
83 if retval == JFileChooser.APPROVE_OPTION:
84 f = self.outer._fileChooser.getSelectedFile()
85 try:
86 writer = FileWriter(f)
87 self.outer._editArea.write(writer) # TextComponent write
88 except IOException,ioex:
89 JOptionPane.showMessageDialog(self.outer, ioex)
90 System.exit(1)
91
92 #/////////////////////////////////////////////////// inner class ExitAction
93 class ExitAction(AbstractAction):
94
95 #============================================= constructor
96 def __init__(self,outer):
97 AbstractAction.__init__(self,"Exit")
98 self.outer=outer
99 self.putValue(AbstractAction.MNEMONIC_KEY, Integer(ord('X')))
100
101 #========================================= actionPerformed
102 def actionPerformed(self, e):
103 System.exit(0);
104
105 #===================================================================== main
106 if __name__=="__main__":
107 NutPad()