frametestedititemaction.java

简单的java文本编辑器

/*************************************************************************************
* 类名： FrameTestEditItemAction                                                               
*                                                                    
* 功能： 此类为编辑器中“Edit"菜单中菜单项所注册的监听器类
*        
**************************************************************************************/
package edit.com;

import java.awt.event.ActionListener;
import javax.swing.JMenuItem;
import java.awt.event.ActionEvent;
import javax.swing.JOptionPane;
import javax.swing.undo.CannotUndoException;
import java.awt.Component;
import java.awt.Color;

class FrameTestEditItemAction implements ActionListener {
    private JMenuItem[] editItems;
    private FrameTestState state;
    private EditArea editArea;
    private FrameTestTools tool;
    private Component c;
    private FrameTestDialogs dialogs;

    public FrameTestEditItemAction( JMenuItem[] aEditItems ,
                                    FrameTestState aState,
                                    EditArea aEditArea,
                                    FrameTestTools aTool,
                                    Component c,
                                    FrameTestDialogs aDialogs ) {
        editItems = aEditItems;
        state = aState;
        editArea = aEditArea;
        tool = aTool;
        this.c = c;
        dialogs = aDialogs;
    }

    public void actionPerformed( ActionEvent e ) {
       if ( editItems[0].equals( ( JMenuItem )e.getSource() ) ) { //”undo“菜单项
           if ( state.getUndoManager().canUndo() ) {
              try {
                  state.getUndoManager().undo();
              }catch( CannotUndoException c ) {
                  JOptionPane.showMessageDialog( this.c,
                                                 "can`t undo" , "error" ,
                                                 JOptionPane.ERROR_MESSAGE );
                  c.printStackTrace();
              }
           }else{
               JOptionPane.showMessageDialog( this.c ,
                                              "can`t undo" , "error" ,
                                              JOptionPane.ERROR_MESSAGE );
               editItems[0].setEnabled( false );
           }
        }else if( editItems[1].equals( ( JMenuItem )e.getSource() ) ) { //”cut"菜单项
            editArea.cut();
        }else if( editItems[2].equals( ( JMenuItem )e.getSource() ) ) {//“copy"菜单项
            editArea.copy();
        }else if( editItems[3].equals( ( JMenuItem )e.getSource() ) ) {//”paste"菜单项
            editArea.paste();
        }else if( editItems[4].equals( ( JMenuItem )e.getSource() ) ) {//"delete"菜单项
            editArea.replaceRange( "",
                                   editArea.getSelectionStart(),
                                   editArea.getSelectionEnd() );
        }else if( editItems[5].equals( ( JMenuItem )e.getSource() ) ) {//“find"菜单项
            dialogs.setFindBox( new Find() );
            dialogs.getFindBox().setString( editArea.getText() );

            if ( dialogs.getFindBox().showDialog( this.c , "FindDialog" ) ) {
                tool.findText( state , editArea , dialogs.getFindBox() );
            }
        }else if( editItems[6].equals( ( JMenuItem )e.getSource() ) ) {//"replace"菜单项
            int showFlag = 0;

            dialogs.setReplaceBox( new Replace() );
            dialogs.getReplaceBox().setString( editArea.getText() );
            showFlag = dialogs.getReplaceBox().showDialog( this.c , "ReplaceDialog" );

            if ( showFlag == 1 ) {
                tool.replaceText( state, editArea, dialogs.getReplaceBox() );
            }else if( showFlag == 2 ) {
                tool.replaceAllText( editArea , dialogs.getReplaceBox() );
            }
        }else if( editItems[7].equals( ( JMenuItem )e.getSource() ) ) {//”goto"菜单项
            int cartPosition = 0;

            dialogs.setGotoBox( new Goto( editArea.getText() ,
                                          editArea.getLineCount() ) );

            if ( dialogs.getGotoBox().showDialog( this.c , "GotoDialog" ) ) {
                cartPosition = dialogs.getGotoBox().getFindPosition();
                editArea.setCaretPosition( cartPosition );
            }
        }else if( editItems[8].equals( ( JMenuItem )e.getSource() ) ) {//“selectAll"菜单项
            editArea.setSelectionColor( Color.red );
            editArea.selectAll();
        }
    }
}