/*******************************************************************************
 * Copyright (c) 2006-2012
 * Software Technology Group, Dresden University of Technology
 * DevBoost GmbH, Berlin, Amtsgericht Charlottenburg, HRB 140026
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *   Software Technology Group - TU Dresden, Germany;
 *   DevBoost GmbH - Berlin, Germany
 *      - initial API and implementation
 ******************************************************************************/
/*
 * @(#)TextEditingTool.java  1.0  2009-04-16
 *
 * Copyright (c) 2009 by the original authors of JHotDraw
 * and all its contributors.
 * All rights reserved.
 *
 * The copyright of this software is owned by the authors and  
 * contributors of the JHotDraw project ("the copyright holders").  
 * You may not use, copy or modify this software, except in  
 * accordance with the license agreement you entered into with  
 * the copyright holders. For details see accompanying license terms. 
 */
package org.jhotdraw.draw;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Point2D;
import javax.swing.undo.AbstractUndoableEdit;
import javax.swing.undo.UndoableEdit;
import org.jhotdraw.util.ResourceBundleUtil;

/**
 * A tool to edit figures which implement the {@code TextHolderFigure} interface,
 * such as {@code TextFigure}.
 *
 * @see TextHolderFigure
 * @see FloatingTextField
 *
 * @author Werner Randelshofer
 * @version 1.0 2009-04-16 Derived from TextTool.
 */
public class TextEditingTool extends AbstractTool implements ActionListener {

    private FloatingTextField textField;
    private TextHolderFigure typingTarget;

    /** Creates a new instance. */
    public TextEditingTool(TextHolderFigure typingTarget) {
        this.typingTarget = typingTarget;
    }

    @Override
    public void deactivate(DrawingEditor editor) {
        endEdit();
        super.deactivate(editor);
    }

    /**
     * If the pressed figure is a TextHolderFigure it can be edited.
     */
    @Override
    public void mousePressed(MouseEvent e) {
        if (typingTarget != null) {
            beginEdit(typingTarget);
            updateCursor(getView(), e.getPoint());
        }
    }

    protected void beginEdit(TextHolderFigure textHolder) {
        if (textField == null) {
            textField = new FloatingTextField();
            textField.addActionListener(this);
        }

        if (textHolder != typingTarget && typingTarget != null) {
            endEdit();
        }

        textField.createOverlay(getView(), textHolder);
        textField.requestFocus();
        typingTarget = textHolder;
    }

    @Override
    public void mouseReleased(MouseEvent evt) {
    }

    protected void endEdit() {
        if (typingTarget != null) {
            typingTarget.willChange();

            final TextHolderFigure editedFigure = typingTarget;
            final String oldText = typingTarget.getText();
            final String newText = textField.getText();

            if (newText.length() > 0) {
                typingTarget.setText(newText);
            }
            UndoableEdit edit = new AbstractUndoableEdit() {

                @Override
                public String getPresentationName() {
                    ResourceBundleUtil labels = ResourceBundleUtil.getBundle("org.jhotdraw.draw.Labels");
                    return labels.getString("attribute.text.text");
                }

                @Override
                public void undo() {
                    super.undo();
                    editedFigure.willChange();
                    editedFigure.setText(oldText);
                    editedFigure.changed();
                }

                @Override
                public void redo() {
                    super.redo();
                    editedFigure.willChange();
                    editedFigure.setText(newText);
                    editedFigure.changed();
                }
            };
            getDrawing().fireUndoableEditHappened(edit);

            typingTarget.changed();
            typingTarget = null;

            textField.endOverlay();
        }
    //	        view().checkDamage();
    }

    @Override
    public void keyReleased(KeyEvent evt) {
        if (evt.getKeyCode() == KeyEvent.VK_ESCAPE) {
            fireToolDone();
        }
    }

    public void actionPerformed(ActionEvent event) {
        endEdit();
        fireToolDone();
    }

    public boolean isEditing() {
        return typingTarget != null;
    }

    @Override
    public void updateCursor(DrawingView view, Point p) {
        if (view.isEnabled()) {
            view.setCursor(Cursor.getPredefinedCursor(isEditing() ? Cursor.DEFAULT_CURSOR : Cursor.CROSSHAIR_CURSOR));
        } else {
            view.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
        }
    }

    public void mouseDragged(MouseEvent e) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
}