Logo
Distributed Genetic Programming Framework
print print

File org.jfree.chart.block.FlowArrangement.java

Here you can find all the information about the file org.jfree.chart.block.FlowArrangement.java. You may explore it here or download it onto your local disk.
/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * --------------------
 * FlowArrangement.java
 * --------------------
 * (C) Copyright 2004, 2005, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: FlowArrangement.java,v 1.13.2.2 2006/08/04 11:48:41 mungady Exp $
 *
 * Changes:
 * --------
 * 22-Oct-2004 : Version 1 (DG);
 * 04-Feb-2005 : Implemented equals() and made serializable (DG);
 * 08-Feb-2005 : Updated for changes in RectangleConstraint (DG);
 * 
 */


package org.jfree.chart.block;

import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import org.jfree.ui.HorizontalAlignment;
import org.jfree.ui.Size2D;
import org.jfree.ui.VerticalAlignment;

/**
 * Arranges blocks in a flow layout.  This class is immutable.
 */

public class FlowArrangement implements Arrangement, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 4543632485478613800L;
    
    /** The horizontal alignment of blocks. */
    private HorizontalAlignment horizontalAlignment;
    
    /** The vertical alignment of blocks within each row. */
    private VerticalAlignment verticalAlignment;
    
    /** The horizontal gap between items within rows. */
    private double horizontalGap;
    
    /** The vertical gap between rows. */
    private double verticalGap;
    
    /**
     * Creates a new instance.
     */

    public FlowArrangement() {   
        this(HorizontalAlignment.CENTER, VerticalAlignment.CENTER, 2.0, 2.0);
    }
     
    /**
     * Creates a new instance.
     * 
     * @param hAlign  the horizontal alignment (currently ignored).
     * @param vAlign  the vertical alignment (currently ignored).
     * @param hGap  the horizontal gap.
     * @param vGap  the vertical gap.
     */

    public FlowArrangement(HorizontalAlignment hAlign, VerticalAlignment vAlign,
                           double hGap, double vGap) {   
        this.horizontalAlignment = hAlign;
        this.verticalAlignment = vAlign;
        this.horizontalGap = hGap;
        this.verticalGap = vGap;
    }
    
    /**
     * Adds a block to be managed by this instance.  This method is usually 
     * called by the {@link BlockContainer}, you shouldn't need to call it 
     * directly.
     * 
     * @param block  the block.
     * @param key  a key that controls the position of the block.
     */

    public void add(Block block, Object key) {
        // since the flow layout is relatively straightforward, 
        // no information needs to be recorded here
    }
    
    /**
     * Calculates and sets the bounds of all the items in the specified 
     * container, subject to the given constraint.  The <code>Graphics2D</code>
     * can be used by some items (particularly items containing text) to 
     * calculate sizing parameters.
     * 
     * @param container  the container whose items are being arranged.
     * @param constraint  the size constraint.
     * @param g2  the graphics device.
     * 
     * @return The size of the container after arrangement of the contents.
     */

    public Size2D arrange(BlockContainer container, Graphics2D g2,
                          RectangleConstraint constraint) {
        
        LengthConstraintType w = constraint.getWidthConstraintType();
        LengthConstraintType h = constraint.getHeightConstraintType();
        if (w == LengthConstraintType.NONE) {
            if (h == LengthConstraintType.NONE) {
                return arrangeNN(container, g2);  
            }
            else if (h == LengthConstraintType.FIXED) {
                return arrangeNF(container, g2, constraint);  
            }
            else if (h == LengthConstraintType.RANGE) {
                throw new RuntimeException("Not implemented.");  
            }
        }
        else if (w == LengthConstraintType.FIXED) {
            if (h == LengthConstraintType.NONE) {
                return arrangeFN(container, g2, constraint);  
            }
            else if (h == LengthConstraintType.FIXED) {
                return arrangeFF(container, g2, constraint);  
            }
            else if (h == LengthConstraintType.RANGE) {
                return arrangeFR(container, g2, constraint);  
            }
        }
        else if (w == LengthConstraintType.RANGE) {
            if (h == LengthConstraintType.NONE) {
                return arrangeRN(container, g2, constraint);  
            }
            else if (h == LengthConstraintType.FIXED) {
                return arrangeRF(container, g2, constraint);  
            }
            else if (h == LengthConstraintType.RANGE) {
                return arrangeRR(container, g2, constraint);   
            }
        }
        throw new RuntimeException("Unrecognised constraint type.");
        
    }

    /**
     * Arranges the blocks in the container with a fixed width and no height 
     * constraint.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size.
     */

    protected Size2D arrangeFN(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {
        
        List blocks = container.getBlocks();
        double width = constraint.getWidth();
        
        double x = 0.0;
        double y = 0.0;
        double maxHeight = 0.0;
        List itemsInRow = new ArrayList();
        for (int i = 0; i < blocks.size(); i++) {
            Block block = (Block) blocks.get(i);
            Size2D size = block.arrange(g2, RectangleConstraint.NONE);
            if (x + size.width <= width) {
                itemsInRow.add(block);
                block.setBounds(
                    new Rectangle2D.Double(x, y, size.width, size.height)
                );
                x = x + size.width + this.horizontalGap;
                maxHeight = Math.max(maxHeight, size.height);
            }
            else {
                if (itemsInRow.isEmpty()) {
                    // place in this row (truncated) anyway
                    block.setBounds(
                        new Rectangle2D.Double(
                            x, y, Math.min(size.width, width - x), size.height
                        )
                    );
                    x = 0.0;
                    y = y + size.height + this.verticalGap;
                }
                else {
                    // start new row
                    itemsInRow.clear();
                    x = 0.0;
                    y = y + maxHeight + this.verticalGap;
                    maxHeight = size.height;
                    block.setBounds(
                        new Rectangle2D.Double(
                            x, y, Math.min(size.width, width), size.height
                        )
                    );
                    x = size.width + this.horizontalGap;
                    itemsInRow.add(block);
                }
            }
        }
        return new Size2D(constraint.getWidth(), y + maxHeight);  
    }
    
    /**
     * Arranges the blocks in the container with a fixed width and a range
     * constraint on the height.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size following the arrangement.
     */

    protected Size2D arrangeFR(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        Size2D s = arrangeFN(container, g2, constraint);
        if (constraint.getHeightRange().contains(s.height)) {
            return s;   
        }
        else {
            RectangleConstraint c = constraint.toFixedHeight(
                constraint.getHeightRange().constrain(s.getHeight())
            );
            return arrangeFF(container, g2, c);
        }
    }

    /**
     * Arranges the blocks in the container with the overall height and width
     * specified as fixed constraints.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size following the arrangement.
     */

    protected Size2D arrangeFF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        // TODO: implement this properly
        return arrangeFN(container, g2, constraint);
    }

    /**
     * Arranges the blocks with the overall width and height to fit within 
     * specified ranges.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size after the arrangement.
     */

    protected Size2D arrangeRR(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        // first arrange without constraints, and see if this fits within
        // the required ranges...
        Size2D s1 = arrangeNN(container, g2);
        if (constraint.getWidthRange().contains(s1.width)) {
            return s1;  // TODO: we didn't check the height yet
        }
        else {
            RectangleConstraint c = constraint.toFixedWidth(
                constraint.getWidthRange().getUpperBound()
            );
            return arrangeFR(container, g2, c);
        }
    }
    
    /**
     * Arranges the blocks in the container with a range constraint on the
     * width and a fixed height.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size following the arrangement.
     */

    protected Size2D arrangeRF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        Size2D s = arrangeNF(container, g2, constraint);
        if (constraint.getWidthRange().contains(s.width)) {
            return s;   
        }
        else {
            RectangleConstraint c = constraint.toFixedWidth(
                constraint.getWidthRange().constrain(s.getWidth())
            );
            return arrangeFF(container, g2, c);
        }
    }

    /**
     * Arranges the block with a range constraint on the width, and no 
     * constraint on the height.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size following the arrangement.
     */

    protected Size2D arrangeRN(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {
        // first arrange without constraints, then see if the width fits
        // within the required range...if not, call arrangeFN() at max width
        Size2D s1 = arrangeNN(container, g2);
        if (constraint.getWidthRange().contains(s1.width)) {
            return s1;   
        }
        else {
            RectangleConstraint c = constraint.toFixedWidth(
                constraint.getWidthRange().getUpperBound()
            );
            return arrangeFN(container, g2, c);
        }
    }
    
    /**
     * Arranges the blocks without any constraints.  This puts all blocks
     * into a single row.
     * 
     * @param container  the container.
     * @param g2  the graphics device.
     * 
     * @return The size after the arrangement.
     */

    protected Size2D arrangeNN(BlockContainer container, Graphics2D g2) {
        double x = 0.0;
        double width = 0.0;
        double maxHeight = 0.0;
        List blocks = container.getBlocks();
        int blockCount = blocks.size();
        if (blockCount > 0) {
            Size2D[] sizes = new Size2D[blocks.size()];
            for (int i = 0; i < blocks.size(); i++) {
                Block block = (Block) blocks.get(i);
                sizes[i] = block.arrange(g2, RectangleConstraint.NONE);
                width = width + sizes[i].getWidth();
                maxHeight = Math.max(sizes[i].height, maxHeight);
                block.setBounds(
                    new Rectangle2D.Double(
                        x, 0.0, sizes[i].width, sizes[i].height
                    )
                );
                x = x + sizes[i].width + this.horizontalGap;
            }
            if (blockCount > 1) {
                width = width + this.horizontalGap * (blockCount - 1);   
            }
            if (this.verticalAlignment != VerticalAlignment.TOP) {
                for (int i = 0; i < blocks.size(); i++) {
                    //Block b = (Block) blocks.get(i);
                    if (this.verticalAlignment == VerticalAlignment.CENTER) {
                        //TODO: shift block down by half
                    }
                    else if (this.verticalAlignment 
                            == VerticalAlignment.BOTTOM) {
                        //TODO: shift block down to bottom
                    }
                }            
            }
        }
        return new Size2D(width, maxHeight);
    }
    
    /**
     * Arranges the blocks with no width constraint and a fixed height 
     * constraint.  This puts all blocks into a single row.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The size after the arrangement.
     */

    protected Size2D arrangeNF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {
        // TODO: for now we are ignoring the height constraint
        return arrangeNN(container, g2);
    }
    
    /**
     * Clears any cached information.
     */

    public void clear() {
        // no action required.
    }
    
    /**
     * Tests this instance for equality with an arbitrary object.
     * 
     * @param obj  the object (<code>null</code> permitted).
     * 
     * @return A boolean.
     */

    public boolean equals(Object obj) {
        if (obj == this) {
            return true;   
        }
        if (!(obj instanceof FlowArrangement)) {
            return false;   
        }
        FlowArrangement that = (FlowArrangement) obj;
        if (this.horizontalAlignment != that.horizontalAlignment) {
            return false;
        }
        if (this.verticalAlignment != that.verticalAlignment) {
            return false;
        }
        if (this.horizontalGap != that.horizontalGap) {
            return false;   
        }
        if (this.verticalGap != that.verticalGap) {
            return false;   
        }
        return true;
    }
    
}

File Information:

file name:FlowArrangement.java
package:org.jfree.chart.block
qualified name:org.jfree.chart.block.FlowArrangement.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/jfree/chart/block/FlowArrangement.java
size:15.995 KB (16379 B)
uploaded: 2015-07-22 04:11:02 GMT+0000
last update: 2006-08-25 12:16:44 GMT+0000
last access: 2017-11-23 05:25:03 GMT+0000

statistics online since 2006-01-02.   RSS Feed
Contact us by sending an email to tweise@gmx.de to receive further information, to report errors, or to join our project.
All content on this site (http://dgpf.sourceforge.net/) is LGPL-licensed.
http://dgpf.sourceforge.net/scripts/source/source.php last modified at 2015-07-22 04:10:53 GMT+0000 served at 2017-11-23 05:25:03 GMT+0000.
Valid CSS Valid XHTML 1.1
Valid RSS SourceForge.net Logo