Jython JTextComponent 1

Jython JTextComponent 1

JTextComponent 1 | Jython Swing | Swing | Jython | Python |

方針

• 半ば強引に、Swingで作成したサンプルを Jythonに書き換えてみる。

内容

• メニューとアクションの割付
• キーボード押下との割付
• Undo、Redoの実装
• Documentの利用
• Documentのイベント感知

ソースコード

実行例

ソースコード

# -*- coding: utf-8 -*-
 
from java.lang import *
from java.awt import BorderLayout,Event
from java.awt.event import ActionEvent, KeyEvent
from java.util import HashMap, Map 

from javax.swing import AbstractAction, Action, InputMap
from javax.swing import SwingUtilities, JFrame, JMenu, JMenuBar, JScrollPane, JTextArea, KeyStroke
from javax.swing.event import UndoableEditEvent, UndoableEditListener
from javax.swing.text import DefaultEditorKit, Document, JTextComponent
from javax.swing.undo import UndoManager
 
class JTextTest(object):
    
    def createUI(self):
        frame = JFrame("TextTest")
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

        txtArea = JTextArea(10, 30)
        frame.contentPane.add(JScrollPane(txtArea), BorderLayout.CENTER)

        # TextComponentが持つActionをMapに格納
        actionMap = {}
        for action in txtArea.actions:
            actionMap[action.getValue(Action.NAME)] = action

        undo = UndoManager()
        action_param = {}
        action_param['undo'] = undo
        redoAction = RedoAction(**action_param)
        action_param['redoAction'] = redoAction
        undoAction = UndoAction(**action_param)
        action_param['undoAction'] = undoAction

        # メニューを作成
        menu = JMenu("Edit")
        menu.add(actionMap.get(DefaultEditorKit.cutAction))
        menu.add(actionMap.get(DefaultEditorKit.copyAction))
        menu.add(actionMap.get(DefaultEditorKit.pasteAction))
        menu.addSeparator()
        menu.add(undoAction)
        menu.add(redoAction)
        menu.addSeparator()
        menu.add(actionMap.get(DefaultEditorKit.selectAllAction))

        mb = JMenuBar()
        mb.add(menu)
        frame.JMenuBar = mb

        # Documentのイベント感知(Undo Redo 管理を行う)
        doc = txtArea.document
        doc.addUndoableEditListener(UndoEventHandler(**action_param))

        # テキストのUndo、Redoにキーを割り当てる (Ctrl+z,Ctrl+y)
        inputMap = txtArea.inputMap
        undoKey = KeyStroke.getKeyStroke(KeyEvent.VK_Z,Event.CTRL_MASK)
        redoKey = KeyStroke.getKeyStroke(KeyEvent.VK_Y,Event.CTRL_MASK)
        inputMap.put(undoKey, undoAction)
        inputMap.put(redoKey, redoAction)

        frame.pack()
        frame.visible = True

class UndoEventHandler(UndoableEditListener):
        def __init__(self, undo, undoAction, redoAction):
            self.undo = undo
            self.undoAction = undoAction
            self.redoAction = redoAction
            
        def undoableEditHappened(self, e):
            self.undo.addEdit(e.edit)
            self.undoAction.updateState()
            self.redoAction.updateState()

class UndoAction(AbstractAction):
    def __init__(self, undo, redoAction):
        super(UndoAction, self).__init__("Undo")
        self.undo = undo
        self.redoAction = redoAction
        self.enabled = False

    def actionPerformed(self, e):
        try:
            self.undo.undo()
        except Exception, ex:
            ex.printStackTrace()
        self.updateState()
        # Redo を可能に
        self.redoAction.updateState()

    def updateState(self):
        self.setEnabled(self.undo.canUndo())

class RedoAction(AbstractAction):
    def __init__(self, undo):
        super(RedoAction, self).__init__("Redo")
        self.undo = undo
        self.enabled = False

    def actionPerformed(self, e):
        try:
            self.undo.redo()
        except Exception, ex:
            ex.printStackTrace()
        self.updateState()

    def updateState(self):
        self.setEnabled(self.undo.canRedo())

class Invoker(Runnable):
    def run(self):
        jtt = JTextTest()
        jtt.createUI()

SwingUtilities.invokeLater(Invoker())