/*
* Copyright (C) 2012 Jason Gedge <http://www.gedge.ca>
*
* This file is part of the OpGraph 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/**
*
*/
package ca.gedge.opgraph.app.edits.notes;
import javax.swing.JComponent;
import javax.swing.undo.AbstractUndoableEdit;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.CannotUndoException;
import javax.swing.undo.UndoableEdit;
import ca.gedge.opgraph.app.commands.graph.MoveNodeCommand;
import ca.gedge.opgraph.app.extensions.Note;
/**
* Sets the location of a note.
*/
public class MoveNoteEdit extends AbstractUndoableEdit {
/** The note's UI component */
private JComponent noteComp;
/** The distance along the x-axis to move the node */
private int deltaX;
/** The distance along the y-axis to move the node */
private int deltaY;
/**
* Constructs an edit that sets the location of a specified note.
*
* @param note the note whose location will be set
* @param deltaX the x-axis delta
* @param deltaY the y-axis delta
*
* @throws NullPointerException if <code>note</code> is <code>null</code>,
* or <code>note.getExtension(JComponent.class)</code> is
* <code>null</code>
*/
public MoveNoteEdit(Note note, int deltaX, int deltaY) {
if(note == null)
throw new NullPointerException();
noteComp = note.getExtension(JComponent.class);
if(noteComp == null)
throw new NullPointerException();
this.deltaX = deltaX;
this.deltaY = deltaY;
perform();
}
// XXX assumes noteComp doesn't change for the note
/**
* Performs this edit.
*/
private void perform() {
noteComp.setLocation(noteComp.getX() + deltaX, noteComp.getY() + deltaY);
}
//
// AbstractUndoableEdit
//
@Override
public boolean replaceEdit(UndoableEdit anEdit) {
if(anEdit instanceof MoveNoteEdit) {
final MoveNoteEdit moveEdit = (MoveNoteEdit)anEdit;
if(noteComp.equals(moveEdit.noteComp)) {
final boolean xDirSame = ((deltaX <= 0 && moveEdit.deltaX <= 0) || (deltaX >= 0 && moveEdit.deltaX >= 0));
final boolean yDirSame = ((deltaY <= 0 && moveEdit.deltaY <= 0) || (deltaY >= 0 && moveEdit.deltaY >= 0));
if(xDirSame && yDirSame) {
deltaX += moveEdit.deltaX;
deltaY += moveEdit.deltaY;
moveEdit.die();
return true;
}
}
}
return false;
}
@Override
public String getPresentationName() {
final String prefix = "Move Note";
final String suffix = MoveNodeCommand.getMoveString(deltaX, deltaY);
if(suffix.length() == 0)
return prefix;
return prefix + " " + suffix;
}
@Override
public boolean isSignificant() {
return (deltaX != 0 || deltaY != 0);
}
@Override
public void redo() throws CannotRedoException {
super.redo();
perform();
}
@Override
public void undo() throws CannotUndoException {
super.undo();
noteComp.setLocation(noteComp.getX() - deltaX, noteComp.getY() - deltaY);
}
}