com.jeta.swingbuilder.gui.commands.DeleteComponentCommand.java Source code

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Here is the source code for com.jeta.swingbuilder.gui.commands.DeleteComponentCommand.java

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/*
 * Copyright (C) 2005 Jeff Tassin
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package com.jeta.swingbuilder.gui.commands;

import javax.swing.undo.CannotRedoException;

import com.jeta.forms.gui.components.ComponentSource;
import com.jeta.forms.gui.components.EmptyComponentFactory;
import com.jeta.forms.gui.form.FormComponent;
import com.jeta.forms.gui.form.GridComponent;
import com.jeta.forms.gui.form.StandardComponent;
import com.jeta.open.registry.JETARegistry;
import com.jeta.swingbuilder.gui.formmgr.AbstractFormManager;
import com.jgoodies.forms.layout.CellConstraints;

/**
 * Command that deletes a component from a view
 * 
 * @author Jeff Tassin
 */
public class DeleteComponentCommand extends FormUndoableEdit {
    /**
     * The grid component to 'delete'
     */
    private GridComponent m_gc;

    /**
     * The constaints assigned to the component.
     */
    private CellConstraints m_comp_constraints;

    /**
     * Default constraints with a width/height = 1
     */
    private CellConstraints m_default_constraints;

    /**
     * An empty component we use to replace the 'deleted' grid component
     */
    private GridComponent m_empty;

    /**
     * ctor
     */
    public DeleteComponentCommand(GridComponent gc, ComponentSource compsrc) {
        super(gc.getParentView().getParentForm());

        m_gc = gc;
        assert (getView() != null);

        m_comp_constraints = m_gc.getConstraints().createCellConstraints();
        m_default_constraints = new CellConstraints(m_gc.getColumn(), m_gc.getRow());

        try {
            EmptyComponentFactory factory = new EmptyComponentFactory(compsrc);
            m_empty = (StandardComponent) factory.createComponent("empty", getView());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * UndoableEdit implementation Override should begin with a call to super.
     */
    public void redo() throws CannotRedoException {
        super.redo();
        if (m_empty != null) {
            getView().replaceComponent(m_empty, m_gc);
            getView().setConstraints(m_empty, m_default_constraints);
        }
    }

    /**
     * UndoableEdit implementation Override should begin with a call to super.
     */
    public void undo() throws CannotRedoException {
        super.undo();
        if (m_empty != null) {
            if (m_gc instanceof FormComponent) {
                // must be re-registered
                AbstractFormManager fmgr = (AbstractFormManager) JETARegistry
                        .lookup(AbstractFormManager.COMPONENT_ID);
                fmgr.registerForm((FormComponent) m_gc);
            }

            getView().replaceComponent(m_gc, m_empty);
            getView().setConstraints(m_gc, m_comp_constraints);
        }
    }

    public String toString() {
        return "DeleteComponentCommand   " + CommandUtils.getBeanDelegate(m_gc);
    }

}