/*
 * @(#)TextAreaEditingTool.java
 *
 * Copyright (c) 2009-2010 The authors and contributors of JHotDraw.
 * You may not use, copy or modify this file, except in compliance with the 
 * accompanying license terms.
 */
package org.jhotdraw.draw.tool;

import edu.umd.cs.findbugs.annotations.Nullable;
import org.jhotdraw.draw.text.*;
import org.jhotdraw.draw.*;
import org.jhotdraw.draw.text.FloatingTextArea;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.undo.AbstractUndoableEdit;
import javax.swing.undo.UndoableEdit;
import org.jhotdraw.geom.*;
import org.jhotdraw.util.ResourceBundleUtil;

/**
 * A tool to edit existing figures that implement the TextHolderFigure
 * interface, such as TextAreaFigure.
 * <p>
 * To edit an existing text figure using the TextAreaEditingTool, the user does the
 * following mouse gesture on a DrawingView:
 * </p>
 * <ol>
 * <li>Press the mouse button over a Figure on the DrawingView.</li>
 * </ol>
 * <p>
 * The TextAreaEditingTool then uses Figure.findFigureInside to find a Figure that
 * implements the TextHolderFigure interface and that is editable. Then it overlays
 * a text area over the drawing where the user can enter the text for the Figure.
 * </p>
 * <hr>
 * <b>Design Patterns</b>
 *
 * <p><em>Framework</em><br>
 * The text creation and editing tools and the {@code TextHolderFigure}
 * interface define together the contracts of a smaller framework inside of the
 * JHotDraw framework for  structured drawing editors.<br>
 * Contract: {@link TextHolderFigure}, {@link TextCreationTool},
 * {@link TextAreaCreationTool}, {@link TextEditingTool},
 * {@link TextAreaEditingTool}, {@link FloatingTextField},
 * {@link FloatingTextArea}.
 * <hr>
 *
 * @author Werner Randelshofer
 * @version $Id$
 *
 * @see TextHolderFigure
 * @see FloatingTextArea
 */
public class TextAreaEditingTool extends AbstractTool implements ActionListener {
    private static final long serialVersionUID = 1L;

    @Nullable private FloatingTextArea textArea;
    @Nullable private TextHolderFigure typingTarget;

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

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

    /**
     * Creates a new figure at the mouse location.
     * If editing is in progress, this finishes editing.
     */
    @Override
    public void mousePressed(MouseEvent e) {
        if (typingTarget != null) {
            beginEdit(typingTarget);
            updateCursor(getView(), e.getPoint());
        }
    }

    @Override
    public void draw(Graphics2D g) {
    }

    protected void beginEdit(TextHolderFigure textHolder) {
        if (textArea == null) {
            textArea = new FloatingTextArea();

        //textArea.addActionListener(this);
        }

        if (textHolder != typingTarget && typingTarget != null) {
            endEdit();
        }
        textArea.createOverlay(getView(), textHolder);
        textArea.setBounds(getFieldBounds(textHolder), textHolder.getText());
        textArea.requestFocus();
        typingTarget = textHolder;
    }

    private Rectangle2D.Double getFieldBounds(TextHolderFigure figure) {
        Rectangle2D.Double r = figure.getDrawingArea();
        Insets2D.Double insets = figure.getInsets();
        insets.subtractTo(r);

        // FIXME - Find a way to determine the parameters for grow.
        //r.grow(1,2);
        //r.width += 16;
        r.x -= 1;
        r.y -= 2;
        r.width += 18;
        r.height += 4;
        return r;
    }

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

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

            typingTarget.willChange();
            if (newText.length() > 0) {
                typingTarget.setText(newText);
            } else {
                typingTarget.setText("");
            }
            typingTarget.changed();

            UndoableEdit edit = new AbstractUndoableEdit() {
    private static final long serialVersionUID = 1L;

                @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;

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

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

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