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ComponentOrientationExample.java

/*
 * Copyright (c) 2002-2004 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *  o Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer. 
 *     
 *  o Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution. 
 *     
 *  o Neither the name of JGoodies Karsten Lentzsch nor the names of 
 *    its contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission. 
 *     
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

package com.jgoodies.forms.tutorial.building;

import java.awt.Component;
import java.awt.Insets;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.WindowConstants;

import com.jgoodies.forms.builder.DefaultFormBuilder;
import com.jgoodies.forms.builder.PanelBuilder;
import com.jgoodies.forms.layout.CellConstraints;
import com.jgoodies.forms.layout.ColumnSpec;
import com.jgoodies.forms.layout.FormLayout;
import com.jgoodies.forms.layout.RowSpec;
import com.jgoodies.forms.layout.FormSpec.DefaultAlignment;

/**
 * Demonstrates how to build panels that honor or ignore the current
 * component orientation: left-to-right vs. right-to-left.<p>
 * 
 * This example uses a utility class that may be moved to the extras or 
 * to the Forms core in a future version. The tricky part is the abstract 
 * definition of column specifications and cell constraints.<p>
 *  
 * The example below utilizes the <code>OrientationUtils</code> to flip
 * column specification defaul alignments and to reverse the order of
 * column specifications. Cell constraints need to be adjusted too; this
 * example avoids the problem by using a builder that creates <em>all</em>
 * cell constraints.<p>
 * 
 * You can find information about the latest additions regarding the
 * Forms support for different component orientations in the comments for 
 * <a href="http://forms.dev.java.net/issues/show_bug.cgi?id=2">issue #2</a>.  
 * 
 * @author  Karsten Lentzsch
 * @version $Revision: 1.6 $
 * 
 * @see     com.jgoodies.forms.builder.AbstractFormBuilder
 * @see     com.jgoodies.forms.builder.DefaultFormBuilder
 */
00074 public final class ComponentOrientationExample {
    
    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel("com.jgoodies.plaf.plastic.PlasticXPLookAndFeel");
        } catch (Exception e) {
            // Likely PlasticXP is not in the class path; ignore.
        }
        JFrame frame = new JFrame();
        frame.setTitle("Forms Tutorial :: Component Orientation");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        JComponent panel = new ComponentOrientationExample().buildPanel();
        frame.getContentPane().add(panel);
        frame.pack();
        frame.setVisible(true);
    }


    public JComponent buildPanel() {
        FormLayout layout = new FormLayout("pref:grow");
        DefaultFormBuilder rowBuilder = new DefaultFormBuilder(layout);
        rowBuilder.setDefaultDialogBorder();
        
        rowBuilder.append(buildSample("Left to Right",       true));
        rowBuilder.append(buildSample("Right to Left",       false));
        rowBuilder.append(buildSample("Default Orientation", 
                new PanelBuilder(layout).isLeftToRight()));
        
        return rowBuilder.getPanel();
    }
    
    /**
     * Creates and returns a sample panel that consists of a titled
     * separator and two component lines each with a 'leading' label.
     * Honors the specified component orientation.<p>
     * 
     * The builder code avoids creating individual cell constraints;
     * all cell constraints used in the example below will be created
     * on-the-fly by the builder layer.<p>
     * 
     * Note that cell constraints should be flipped and repositioned
     * if they are intended for being used with left-to-right and
     * right-to-left layouts.
     * 
     * @return the sample panel
     */
00120     private Component buildSample(String title, boolean leftToRight) {
        String leftToRightSpecs = "right:pref, 4dlu, pref:grow, 3dlu, pref:grow";
        FormLayout layout = leftToRight 
                   ? new FormLayout(leftToRightSpecs)
                   : new FormLayout(OrientationUtils.flipped(leftToRightSpecs),
                                    new RowSpec[] {});
        DefaultFormBuilder builder = new DefaultFormBuilder(layout);
        builder.setLeftToRight(leftToRight);
        builder.setDefaultDialogBorder();
        
        builder.appendSeparator(title);
        builder.append("Level"); 
        builder.append(new JTextField(10), 3);
        
        builder.append("Radar", new JTextField(10));
        builder.append(new JTextField(10));
        return builder.getPanel();
    }
    
    
    // Helper Code ************************************************************
    
    /**
     * Provides some convenience behavior for flipping side in column
     * specifications, arrays of column specifications and encoded
     * column specs.
     */
00147     private static class OrientationUtils {
    
        /**
         * Flips the default alignment of the given column specification 
         * and returns a new column specification object with the flipped
         * alignment and the same size and growing behavior as the original.
         * 
         * @param spec    the original column specification
         * @return the column specification with flipped default alignment
         */
00157         static ColumnSpec flipped(ColumnSpec spec) {
            DefaultAlignment alignment = spec.getDefaultAlignment();
            if (alignment == ColumnSpec.LEFT)
                alignment = ColumnSpec.RIGHT;
            else if (alignment == ColumnSpec.RIGHT)
                alignment = ColumnSpec.LEFT;
            return new ColumnSpec(alignment, spec.getSize(), spec.getResizeWeight());
        }
        
        /**
         * Returns an array of column specifications that is built from the
         * given array by flipping each column spec and reversing their order.
         * 
         * @param original  the original array of column specifications
         * @return an array of flipped column specs in reversed order
         */
00173         static ColumnSpec[] flipped(ColumnSpec[] original) {
            int length = original.length;
            ColumnSpec[] flipped = new ColumnSpec[length];
            for (int i = 0; i < length; i++) {
                flipped[i] = flipped(original[length -1 - i]);
            }
            return flipped;
        }
        
        /**
         * Returns an array of column specifications that is built from the
         * given encoded column specifications by flipping each column spec 
         * and reversing their order.
         * 
         * @param encodedColumnSpecs  the original comma-separated encoded 
         *     column specifications
         * @return an array of flipped column specs in reversed order
         */
00191         static ColumnSpec[] flipped(String encodedColumnSpecs) {
            return flipped(ColumnSpec.decodeSpecs(encodedColumnSpecs));
        }
        
        /**
         * Creates and returns a horizontally flipped clone of the 
         * given cell constraints object. Flips the horizontal alignment
         * and the left and right insets.
         * 
         * @param cc   the original cell constraints object
         * @return the flipped cell constraints with flipped horizontal 
         *     alignment, and flipped left and right insets - if any
         */
00204         static CellConstraints flipHorizontally(CellConstraints cc) {
            CellConstraints.Alignment flippedHAlign = cc.hAlign;
            if (flippedHAlign == CellConstraints.LEFT)
                flippedHAlign = CellConstraints.RIGHT;
            else if (flippedHAlign == CellConstraints.RIGHT)
                flippedHAlign = CellConstraints.LEFT;
            
            CellConstraints flipped = new CellConstraints(
                    cc.gridX, 
                    cc.gridY,
                    cc.gridWidth,
                    cc.gridHeight,
                    flippedHAlign,
                    cc.vAlign);
            if (cc.insets != null) {
                flipped.insets = new Insets(
                        cc.insets.top, 
                        cc.insets.right, 
                        cc.insets.bottom, 
                        cc.insets.left);
            }
            return flipped;
        }
        
        /**
         * Creates and returns a horizontally flipped clone of the 
         * given cell constraints object with the grid position adjusted
         * to the given column count. Flips the horizontal alignment
         * and the left and right insets. And swaps the left and right
         * cell positions according to the specified column count.
         * 
         * @param cc   the original cell constraints object
         * @param columnCount the number of columns; 
         *     used to swap the left and right cell bounds
         * @return the flipped cell constraints with flipped horizontal 
         *     alignment, and flipped left and right insets - if any
         */
00241         static CellConstraints flipHorizontally(CellConstraints cc, int columnCount) {
            CellConstraints flipped = flipHorizontally(cc);
            flipped.gridX = columnCount + 1 - cc.gridX;
            return flipped;
        }
    }

}


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