source: trunk/gli/src/org/greenstone/gatherer/cdm/MacrosManager.java@ 12468

/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * Author: Katherine Don, Greenstone Digital Library, University of Waikato
 *
 * Copyright (C) 2006 New Zealand Digital Library Project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */
package org.greenstone.gatherer.cdm;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.undo.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

import org.greenstone.gatherer.collection.CollectionManager;
import org.greenstone.gatherer.Configuration;
import org.greenstone.gatherer.Dictionary;
import org.greenstone.gatherer.Gatherer;
import org.greenstone.gatherer.gui.DesignPaneHeader;
import org.greenstone.gatherer.gui.GLIButton;

public class MacrosManager {

    /** The controls used to modify the general options. */
    private Control controls;
    /** Constructor. */
    public MacrosManager() {
    }


    /** Destructor. */
    public void destroy() {
    if (controls != null) {
        controls.destroy();
        controls = null;
    }
    }

    public void loseFocus() {
    }

    public void gainFocus() {

    }
    /** This class is resposible for generating the controls for the editing of general options.
     * @return the Control for editing the general options
     */
    public Control getControls() {
    if (controls == null) {
        controls = new MacrosControl();
    }
    return controls;
    }
    

    /** Called when the detail mode has changed which in turn may cause several design elements to be available/hidden
     * @param mode the new mode as an int
     */
    public void modeChanged(int mode) {

    }


    private class MacrosControl
    extends JPanel
    implements Control, WindowFocusListener {

    JTextArea macros_textarea = null;
    JButton undo_button = null;
    JButton redo_button = null;
    private final UndoManager undo = new UndoManager();
    private boolean macros_changed = false;
    public MacrosControl() {
        super();

        JPanel header_pane = new DesignPaneHeader("CDM.GUI.Macros", "collectionspecificmacros");
        
        JPanel main_pane = new JPanel();
        main_pane.setLayout(new BorderLayout());
        macros_textarea = new JTextArea();
        macros_textarea.setBackground(Configuration.getColor("coloring.editable_background", false));
        macros_textarea.setLineWrap(false);
        macros_textarea.setWrapStyleWord(false);
        macros_textarea.setToolTipText(Dictionary.get("CDM.MacrosManager.Editor_Tooltip"));
        readMacroFile(); // load in the original contents
        macros_textarea.getDocument().addDocumentListener(new EditorListener());

        // Listen for undo and redo events
        macros_textarea.getDocument().addUndoableEditListener(new UndoableEditListener() {
            public void undoableEditHappened(UndoableEditEvent evt) {
            undo.addEdit(evt.getEdit());
            }
        });
        macros_textarea.setCaretPosition(0);
        
        JPanel macros_pane = new JPanel();
        macros_pane.setBorder(BorderFactory.createEmptyBorder(5,0,5,0));
        macros_pane.setLayout(new BorderLayout());
        macros_pane.add(new JScrollPane(macros_textarea), BorderLayout.CENTER);
        undo_button = new GLIButton(Dictionary.get("General.Undo"), Dictionary.get("General.Undo_Tooltip"));
        undo_button.setEnabled(false);
        undo_button.addActionListener(new UndoListener());

        redo_button = new GLIButton(Dictionary.get("General.Redo"), Dictionary.get("General.Redo_Tooltip"));
        redo_button.setEnabled(false);
        redo_button.addActionListener(new RedoListener());
        
        JPanel button_pane = new JPanel();
        button_pane.setLayout(new GridLayout(1,2));
        button_pane.add(undo_button);
        button_pane.add(redo_button);

        main_pane.add(macros_pane, BorderLayout.CENTER);
        main_pane.add(button_pane, BorderLayout.SOUTH);

        setBorder(BorderFactory.createEmptyBorder(0,5,0,0));
        setLayout(new BorderLayout());
        add(header_pane, BorderLayout.NORTH);
        add(main_pane, BorderLayout.CENTER);
        Gatherer.g_man.addWindowFocusListener(this);
    }

    public void destroy() {
    }

    public void loseFocus() {
        if (macros_changed) {
        writeMacroFile();
        macros_changed = false;
        }
    }

    public void gainFocus() {
        macros_textarea.grabFocus();
    }
    
    public void windowGainedFocus(WindowEvent e) {
    }
    
    public void windowLostFocus(WindowEvent e) {
        if (macros_changed) {
        writeMacroFile();
        macros_changed = false;
        }       
    }

    private void readMacroFile() {
        macros_textarea.setText("");
        File extra_dm = new File(CollectionManager.getCollectionDirectoryPath()+"macros"+File.separator+"extra.dm");
        
        if (extra_dm.exists()) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(extra_dm), "UTF-8"));
        
            String line;
            while ((line = br.readLine()) != null) {
            macros_textarea.append(line+"\n");
            }

            br.close();
        } catch (Exception e) {
            System.err.println("MacrosManager Exception: "+e.getMessage());
        }
        }
    }
    
    private void writeMacroFile() {
        File extra_dm = new File(CollectionManager.getCollectionDirectoryPath()+"macros"+File.separator+"extra.dm");
        try {
        if (!extra_dm.exists()) {
            File parent_dir = extra_dm.getParentFile();
            parent_dir.mkdirs();
            extra_dm.createNewFile();
        }
        
        BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(extra_dm), "UTF-8"));
        String text = macros_textarea.getText();
        out.write(text, 0, text.length());
        out.newLine();
        out.flush();
        out.close();
        } catch (Exception e) {
        System.err.println("MacrosManager Exception: "+e.getMessage());
        }
    }

    private class EditorListener
        implements DocumentListener {
        public void changedUpdate(DocumentEvent e) {
        macros_changed = true;
        undo_button.setEnabled(true);
        }
          
        public void insertUpdate(DocumentEvent e) {
        macros_changed = true;
        undo_button.setEnabled(true);
        }
          
        public void removeUpdate(DocumentEvent e) {
        macros_changed = true;
        undo_button.setEnabled(true);
        }

    }

    private class UndoListener
        implements ActionListener {
        
        public void actionPerformed(ActionEvent event) {
        try {
                    if (undo.canUndo()) {
                        int pos = macros_textarea.getCaretPosition();
                        undo.undo();
            macros_textarea.setCaretPosition(pos-1);
            macros_textarea.grabFocus();
            redo_button.setEnabled(true); 
            
                    }
                    if (!undo.canUndo()){
            undo_button.setEnabled(false);
            }
            else{
                        undo_button.setEnabled(true); 
            }   
            
                } catch (Exception e) {
            System.err.println("MacrosManager Exception: "+e.getMessage());
                }           
        }
    }
    
       private class RedoListener
       implements ActionListener {
       
       public void actionPerformed(ActionEvent evt) {
           try {
           if (undo.canRedo()) {
               int pos = macros_textarea.getCaretPosition();
               undo.redo();
               macros_textarea.setCaretPosition(pos+1); 
               macros_textarea.grabFocus();
           }
           if (!undo.canRedo()){
               redo_button.setEnabled(false);
           }
           else{
               redo_button.setEnabled(true); 
           }                     
           
           } catch (Exception e) {
           System.err.println("MacrosManager Exception: "+e.getMessage());
           }
       }
       }
    
    }
    
    
    
}