overlaylayout.java

JfreeChart 常用图表例子

/**
 * ========================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================
 *
 * This programm 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.
 *
 * This application contains intellectual property of Prof. Dr.-Ing. Hans-Peter Wiedling
 * (University of Applied Science Darmstadt).
 *
 * ------------------------------
 * OverlayLayout.java
 * ------------------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   -;
 *
 * $Id: OverlayLayout.java,v 1.4 2005/06/01 14:12:29 taqua Exp $
 *
 * Changes
 * -------------------------
 * 09-12-2003 : Initial version
 *
 */
package org.jfree.ui;

import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.Rectangle;

/**
 * A simple layoutmanager to overlay all components of a parent.
 * <p/>
 * This layout manager acts similiar to the card layout, but all
 * childs of the parent band have the same size and all childs can
 * be visible at the same time.
 *
 * @author Thomas Morgner
 */
public final class OverlayLayout implements LayoutManager {

    /**
     * A flag that defines, whether invisible components should be ignored when
     * computing the layout.
     */
    private boolean ignoreInvisible;

    /**
     * Creates a new instance.
     * 
     * @param ignoreInvisible  whether to ignore invisible components when computing the layout.
     */
    public OverlayLayout(final boolean ignoreInvisible) {
        this.ignoreInvisible = ignoreInvisible;
    }

    /**
     * DefaultConstructor.
     */
    public OverlayLayout() {

    }

    /**
     * If the layout manager uses a per-component string,
     * adds the component <code>comp</code> to the layout,
     * associating it
     * with the string specified by <code>name</code>.
     *
     * @param name the string to be associated with the component
     * @param comp the component to be added
     */
    public void addLayoutComponent(final String name, final Component comp) {
    }

    /**
     * Removes the specified component from the layout.
     *
     * @param comp the component to be removed
     */
    public void removeLayoutComponent(final Component comp) {
    }

    /**
     * Lays out the specified container.
     *
     * @param parent the container to be laid out
     */
    public void layoutContainer(final Container parent) {
        synchronized (parent.getTreeLock()) {
            final Insets ins = parent.getInsets();

            final Rectangle bounds = parent.getBounds();
            final int width = bounds.width - ins.left - ins.right;
            final int height = bounds.height - ins.top - ins.bottom;

            final Component[] comps = parent.getComponents();

            for (int i = 0; i < comps.length; i++) {
                final Component c = comps[i];
                if ((comps[i].isVisible() == false) && this.ignoreInvisible) {
                    continue;
                }
                c.setBounds(ins.left, ins.top, width, height);
            }
        }
    }

    /**
     * Calculates the minimum size dimensions for the specified
     * container, given the components it contains.
     *
     * @param parent the component to be laid out
     * @return the minimum size computed for the parent.
     * @see #preferredLayoutSize
     */
    public Dimension minimumLayoutSize(final Container parent) {
        synchronized (parent.getTreeLock()) {
            final Insets ins = parent.getInsets();
            final Component[] comps = parent.getComponents();
            int height = 0;
            int width = 0;
            for (int i = 0; i < comps.length; i++) {
                if ((comps[i].isVisible() == false) && this.ignoreInvisible) {
                    continue;
                }

                final Dimension pref = comps[i].getMinimumSize();
                if (pref.height > height) {
                    height = pref.height;
                }
                if (pref.width > width) {
                    width = pref.width;
                }
            }
            return new Dimension(width + ins.left + ins.right,
                height + ins.top + ins.bottom);
        }
    }

    /**
     * Calculates the preferred size dimensions for the specified
     * container, given the components it contains.
     *
     * @param parent the container to be laid out
     * @return the preferred size computed for the parent.
     * @see #minimumLayoutSize
     */
    public Dimension preferredLayoutSize(final Container parent) {
        synchronized (parent.getTreeLock()) {
            final Insets ins = parent.getInsets();
            final Component[] comps = parent.getComponents();
            int height = 0;
            int width = 0;
            for (int i = 0; i < comps.length; i++) {
                if ((comps[i].isVisible() == false) && this.ignoreInvisible) {
                    continue;
                }

                final Dimension pref = comps[i].getPreferredSize();
                if (pref.height > height) {
                    height = pref.height;
                }
                if (pref.width > width) {
                    width = pref.width;
                }
            }
            return new Dimension(width + ins.left + ins.right,
                height + ins.top + ins.bottom);
        }
    }

}