Source Code Cross Referenced for GridBagLayout.java in  » 6.0-JDK-Modules » j2me » java » awt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.awt 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


0001:        /*
0002:         * @(#)GridBagLayout.java	1.14 06/10/10
0003:         *
0004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
0005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
0006:         * 
0007:         * This program is free software; you can redistribute it and/or
0008:         * modify it under the terms of the GNU General Public License version
0009:         * 2 only, as published by the Free Software Foundation. 
0010:         * 
0011:         * This program is distributed in the hope that it will be useful, but
0012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
0013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
0014:         * General Public License version 2 for more details (a copy is
0015:         * included at /legal/license.txt). 
0016:         * 
0017:         * You should have received a copy of the GNU General Public License
0018:         * version 2 along with this work; if not, write to the Free Software
0019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
0020:         * 02110-1301 USA 
0021:         * 
0022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
0023:         * Clara, CA 95054 or visit www.sun.com if you need additional
0024:         * information or have any questions. 
0025:         *
0026:         */
0027:        package java.awt;
0028:
0029:        import java.util.Hashtable;
0030:        import java.util.Vector;
0031:
0032:        class GridBagLayoutInfo implements  java.io.Serializable {
0033:            int width, height; /* number of cells horizontally, vertically */
0034:            int startx, starty; /* starting point for layout */
0035:            int minWidth[]; /* largest minWidth in each column */
0036:            int minHeight[]; /* largest minHeight in each row */
0037:            double weightX[]; /* largest weight in each column */
0038:            double weightY[]; /* largest weight in each row */
0039:
0040:            GridBagLayoutInfo() {
0041:                minWidth = new int[GridBagLayout.MAXGRIDSIZE];
0042:                minHeight = new int[GridBagLayout.MAXGRIDSIZE];
0043:                weightX = new double[GridBagLayout.MAXGRIDSIZE];
0044:                weightY = new double[GridBagLayout.MAXGRIDSIZE];
0045:            }
0046:        }
0047:
0048:        /**
0049:         * The <code>GridBagLayout</code> class is a flexible layout 
0050:         * manager that aligns components vertically and horizontally,
0051:         * without requiring that the components be of the same size.
0052:         * Each <code>GridBagLayout</code> object maintains a dynamic 
0053:         * rectangular grid of cells, with each component occupying 
0054:         * one or more cells, called its <em>display area</em>.
0055:         * <p>
0056:         * Each component managed by a grid bag layout is associated 
0057:         * with an instance of 
0058:         * <a href="java.awt.GridBagConstraints.html"><code>GridBagConstraints</code></a> 
0059:         * that specifies how the component is laid out within its display area.
0060:         * <p>
0061:         * How a <code>GridBagLayout</code> object places a set of components
0062:         * depends on the <code>GridBagConstraints</code> object associated 
0063:         * with each component, and on the minimum size 
0064:         * and the preferred size of the components' containers.
0065:         * <p>
0066:         * To use a grid bag layout effectively, you must customize one or more 
0067:         * of the <code>GridBagConstraints</code> objects that are associated 
0068:         * with its components. You customize a <code>GridBagConstraints</code> 
0069:         * object by setting one or more of its instance variables:
0070:         * <p>
0071:         * <dl>
0072:         * <dt><a href="java.awt.GridBagConstraints.html#gridx"><code>gridx</code></a>,
0073:         * <a href="java.awt.GridBagConstraints.html#gridy"><code>gridy</code></a>
0074:         * <dd>Specifies the cell at the upper left of the component's display area,
0075:         * where the upper-left-most cell has address 
0076:         * <code>gridx&nbsp;=&nbsp;0</code>, 
0077:         * <code>gridy&nbsp;=&nbsp;0</code>. 
0078:         * Use <code>GridBagConstraints.RELATIVE</code> (the default value)
0079:         * to specify that the component be just placed
0080:         * just to the right of (for <code>gridx</code>)
0081:         * or just below (for <code>gridy</code>)
0082:         * the component that was added to the container
0083:         * just before this component was added.
0084:         * <dt><a href="java.awt.GridBagConstraints.html#gridwidth"><code>gridwidth</code></a>,
0085:         * <a href="java.awt.GridBagConstraints.html#gridheight"><code>gridheight</code></a>
0086:         * <dd>Specifies the number of cells in a row (for <code>gridwidth</code>)
0087:         * or column (for <code>gridheight</code>)
0088:         * in the component's display area.
0089:         * The default value is 1.
0090:         * Use <code>GridBagConstraints.REMAINDER</code> to specify 
0091:         * that the component be the last one in its row (for <code>gridwidth</code>)
0092:         * or column (for <code>gridheight</code>).
0093:         * Use <code>GridBagConstraints.RELATIVE</code> to specify 
0094:         * that the component be the next to last one
0095:         * in its row (for <code>gridwidth</code>) 
0096:         * or column (for <code>gridheight</code>).
0097:         * <dt><a href="java.awt.GridBagConstraints.html#fill"><code>fill</code></a>
0098:         * <dd>Used when the component's display area
0099:         * is larger than the component's requested size
0100:         * to determine whether (and how) to resize the component.
0101:         * Possible values are
0102:         * <code>GridBagConstraints.NONE</code> (the default),
0103:         * <code>GridBagConstraints.HORIZONTAL</code> 
0104:         * (make the component wide enough to fill its display area
0105:         * horizontally, but don't change its height),
0106:         * <code>GridBagConstraints.VERTICAL</code> 
0107:         * (make the component tall enough to fill its display area 
0108:         * vertically, but don't change its width), and 
0109:         * <code>GridBagConstraints.BOTH</code> 
0110:         * (make the component fill its display area entirely). 
0111:         * <dt><a href="java.awt.GridBagConstraints.html#ipadx"><code>ipadx</code></a>,
0112:         * <a href="java.awt.GridBagConstraints.html#ipady"><code>ipady</code></a>
0113:         * <dd>Specifies the component's internal padding within the layout, 
0114:         * how much to add to the minimum size of the component.
0115:         * The width of the component will be at least its minimum width 
0116:         * plus <code>(ipadx&nbsp;*&nbsp;2)</code> pixels (since the padding 
0117:         * applies to both sides of the component). Similarly, the height of 
0118:         * the component will be at least the minimum height plus 
0119:         * <code>(ipady&nbsp;*&nbsp;2)</code> pixels.
0120:         * <dt><a href="java.awt.GridBagConstraints.html#insets"><code>insets</code></a>
0121:         * <dd>Specifies the component's external padding, the minimum
0122:         * amount of space between the component and the edges of its display area.
0123:         * <dt><a href="java.awt.GridBagConstraints.html#anchor"><code>anchor</code></a>
0124:         * <dd>Used when the component is smaller than its display area
0125:         * to determine where (within the display area) to place the component.
0126:         * Valid values are 
0127:         * <code>GridBagConstraints.CENTER</code> (the default), 
0128:         * <code>GridBagConstraints.NORTH</code>, 
0129:         * <code>GridBagConstraints.NORTHEAST</code>, 
0130:         * <code>GridBagConstraints.EAST</code>, 
0131:         * <code>GridBagConstraints.SOUTHEAST</code>, 
0132:         * <code>GridBagConstraints.SOUTH</code>, 
0133:         * <code>GridBagConstraints.SOUTHWEST</code>, 
0134:         * <code>GridBagConstraints.WEST</code>, and 
0135:         * <code>GridBagConstraints.NORTHWEST</code>. 
0136:         * <dt><a href="java.awt.GridBagConstraints.html#weightx"><code>weightx</code></a>,
0137:         * <a href="java.awt.GridBagConstraints.html#weighty"><code>weighty</code></a>
0138:         * <dd>Used to determine how to distribute space, which is 
0139:         * important for specifying resizing behavior.
0140:         * Unless you specify a weight for at least one component 
0141:         * in a row (<code>weightx</code>) and column (<code>weighty</code>), 
0142:         * all the components clump together in the center of their container.
0143:         * This is because when the weight is zero (the default),
0144:         * the <code>GridBagLayout</code> object puts any extra space 
0145:         * between its grid of cells and the edges of the container.
0146:         * </dl>
0147:         * <p>
0148:         * The following figure shows ten components (all buttons)
0149:         * managed by a grid bag layout:
0150:         * <p>
0151:         * <img src="images-awt/GridBagLayout-1.gif" 
0152:         * ALIGN=center HSPACE=10 VSPACE=7>
0153:         * <p>
0154:         * Each of the ten components has the <code>fill</code> field 
0155:         * of its associated <code>GridBagConstraints</code> object 
0156:         * set to <code>GridBagConstraints.BOTH</code>.
0157:         * In addition, the components have the following non-default constraints:
0158:         * <p>
0159:         * <ul>
0160:         * <li>Button1, Button2, Button3: <code>weightx&nbsp;=&nbsp;1.0</code> 
0161:         * <li>Button4: <code>weightx&nbsp;=&nbsp;1.0</code>, 
0162:         * <code>gridwidth&nbsp;=&nbsp;GridBagConstraints.REMAINDER</code> 
0163:         * <li>Button5: <code>gridwidth&nbsp;=&nbsp;GridBagConstraints.REMAINDER</code> 
0164:         * <li>Button6: <code>gridwidth&nbsp;=&nbsp;GridBagConstraints.RELATIVE</code> 
0165:         * <li>Button7: <code>gridwidth&nbsp;=&nbsp;GridBagConstraints.REMAINDER</code> 
0166:         * <li>Button8: <code>gridheight&nbsp;=&nbsp;2</code>, 
0167:         * <code>weighty&nbsp;=&nbsp;1.0</code> 
0168:         * <li>Button9, Button 10: 
0169:         * <code>gridwidth&nbsp;=&nbsp;GridBagConstraints.REMAINDER</code> 
0170:         * </ul>
0171:         * <p>
0172:         * Here is the code that implements the example shown above:
0173:         * <p>
0174:         * <hr><blockquote><pre>
0175:         * import java.awt.*;
0176:         * import java.util.*;
0177:         * import java.applet.Applet;
0178:         * 
0179:         * public class GridBagEx1 extends Applet {
0180:         * 
0181:         *     protected void makebutton(String name,
0182:         *                               GridBagLayout gridbag,
0183:         *                               GridBagConstraints c) {
0184:         *         Button button = new Button(name);
0185:         *         gridbag.setConstraints(button, c);
0186:         *         add(button);
0187:         *     }
0188:         * 
0189:         *     public void init() {
0190:         *         GridBagLayout gridbag = new GridBagLayout();
0191:         *         GridBagConstraints c = new GridBagConstraints();
0192:         *  
0193:         *         setFont(new Font("Helvetica", Font.PLAIN, 14));
0194:         *         setLayout(gridbag);
0195:         *    
0196:         *         c.fill = GridBagConstraints.BOTH;
0197:         *         c.weightx = 1.0;
0198:         *         makebutton("Button1", gridbag, c);
0199:         *         makebutton("Button2", gridbag, c);
0200:         *         makebutton("Button3", gridbag, c);
0201:         *     
0202:         *     	   c.gridwidth = GridBagConstraints.REMAINDER; //end row
0203:         *         makebutton("Button4", gridbag, c);
0204:         *     
0205:         *         c.weightx = 0.0;		   //reset to the default
0206:         *         makebutton("Button5", gridbag, c); //another row
0207:         *     
0208:         * 	   c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row
0209:         *         makebutton("Button6", gridbag, c);
0210:         *     
0211:         * 	   c.gridwidth = GridBagConstraints.REMAINDER; //end row
0212:         *         makebutton("Button7", gridbag, c);
0213:         *     
0214:         * 	   c.gridwidth = 1;	   	   //reset to the default
0215:         * 	   c.gridheight = 2;
0216:         *         c.weighty = 1.0;
0217:         *         makebutton("Button8", gridbag, c);
0218:         *     
0219:         *         c.weighty = 0.0;		   //reset to the default
0220:         * 	   c.gridwidth = GridBagConstraints.REMAINDER; //end row
0221:         * 	   c.gridheight = 1;		   //reset to the default
0222:         *         makebutton("Button9", gridbag, c);
0223:         *         makebutton("Button10", gridbag, c);
0224:         *     
0225:         *         setSize(300, 100);
0226:         *     }
0227:         *     
0228:         *     public static void main(String args[]) {
0229:         * 	   Frame f = new Frame("GridBag Layout Example");
0230:         * 	   GridBagEx1 ex1 = new GridBagEx1();
0231:         *     
0232:         * 	   ex1.init();
0233:         *     
0234:         * 	   f.add("Center", ex1);
0235:         * 	   f.pack();
0236:         * 	   f.setSize(f.getPreferredSize());
0237:         * 	   f.show();
0238:         *     }
0239:         * }
0240:         * </pre></blockquote><hr>
0241:         * <p>
0242:         * @version 1.5, 16 Nov 1995
0243:         * @author Doug Stein
0244:         * @see       java.awt.GridBagConstraints
0245:         * @since     JDK1.0
0246:         */
0247:        public class GridBagLayout implements  LayoutManager2,
0248:                java.io.Serializable {
0249:            /**
0250:             * The maximum number of grid positions (both horizontally and 
0251:             * vertically) that can be laid out by the grid bag layout. 
0252:             * @since     JDK1.0
0253:             */
0254:            protected static final int MAXGRIDSIZE = 512;
0255:            /**
0256:             * The smallest grid that can be laid out by the grid bag layout. 
0257:             * @since     JDK1.0
0258:             */
0259:            protected static final int MINSIZE = 1;
0260:            protected static final int PREFERREDSIZE = 2;
0261:            protected Hashtable comptable;
0262:            protected GridBagConstraints defaultConstraints;
0263:            private GridBagLayoutInfo layoutInfo;
0264:            public int columnWidths[];
0265:            public int rowHeights[];
0266:            public double columnWeights[];
0267:            public double rowWeights[];
0268:
0269:            /**
0270:             * Creates a grid bag layout manager.
0271:             * @since       JDK1.0
0272:             */
0273:            public GridBagLayout() {
0274:                comptable = new Hashtable();
0275:                defaultConstraints = new GridBagConstraints();
0276:            }
0277:
0278:            /**
0279:             * Sets the constraints for the specified component in this layout.
0280:             * @param       comp the component to be modified.
0281:             * @param       constraints the constraints to be applied.
0282:             * @since       JDK1.0
0283:             */
0284:            public void setConstraints(Component comp,
0285:                    GridBagConstraints constraints) {
0286:                comptable.put(comp, constraints.clone());
0287:            }
0288:
0289:            /**
0290:             * Gets the constraints for the specified component.  A copy of
0291:             * the actual <code>GridBagConstraints</code> object is returned.
0292:             * @param       comp the component to be queried.
0293:             * @return      the constraint for the specified component in this 
0294:             *                  grid bag layout; a copy of the actual constraint 
0295:             *                  object is returned.
0296:             * @since       JDK1.0
0297:             */
0298:            public GridBagConstraints getConstraints(Component comp) {
0299:                GridBagConstraints constraints = (GridBagConstraints) comptable
0300:                        .get(comp);
0301:                if (constraints == null) {
0302:                    setConstraints(comp, defaultConstraints);
0303:                    constraints = (GridBagConstraints) comptable.get(comp);
0304:                }
0305:                return (GridBagConstraints) constraints.clone();
0306:            }
0307:
0308:            /**
0309:             * Retrieves the constraints for the specified component.  
0310:             * The return value is not a copy, but is the actual 
0311:             * <code>GridBagConstraints</code> object used by the layout mechanism. 
0312:             * @param       comp the component to be queried
0313:             * @return      the contraints for the specified component.
0314:             * @since       JDK1.0
0315:             */
0316:            protected GridBagConstraints lookupConstraints(Component comp) {
0317:                GridBagConstraints constraints = (GridBagConstraints) comptable
0318:                        .get(comp);
0319:                if (constraints == null) {
0320:                    setConstraints(comp, defaultConstraints);
0321:                    constraints = (GridBagConstraints) comptable.get(comp);
0322:                }
0323:                return constraints;
0324:            }
0325:
0326:            /**
0327:             * Determines the origin of the layout grid. 
0328:             * Most applications do not call this method directly.
0329:             * @return     the origin of the cell in the top-left 
0330:             *                    corner of the layout grid.
0331:             * @since      JDK1.1
0332:             */
0333:            public Point getLayoutOrigin() {
0334:                Point origin = new Point(0, 0);
0335:                if (layoutInfo != null) {
0336:                    origin.x = layoutInfo.startx;
0337:                    origin.y = layoutInfo.starty;
0338:                }
0339:                return origin;
0340:            }
0341:
0342:            /**
0343:             * Determines column widths and row heights for the layout grid.
0344:             * <p>
0345:             * Most applications do not call this method directly.
0346:             * @return     an array of two arrays, containing the widths 
0347:             *                       of the layout columns and
0348:             *                       the heights of the layout rows.
0349:             * @since      JDK1.1
0350:             */
0351:            public int[][] getLayoutDimensions() {
0352:                if (layoutInfo == null)
0353:                    return new int[2][0];
0354:                int dim[][] = new int[2][];
0355:                dim[0] = new int[layoutInfo.width];
0356:                dim[1] = new int[layoutInfo.height];
0357:                System.arraycopy(layoutInfo.minWidth, 0, dim[0], 0,
0358:                        layoutInfo.width);
0359:                System.arraycopy(layoutInfo.minHeight, 0, dim[1], 0,
0360:                        layoutInfo.height);
0361:                return dim;
0362:            }
0363:
0364:            /**
0365:             * Determines the weights of the layout grid's columns and rows.
0366:             * Weights are used to calculate how much a given column or row
0367:             * stretches beyond its preferred size, if the layout has extra
0368:             * room to fill.
0369:             * <p>
0370:             * Most applications do not call this method directly.
0371:             * @return      an array of two arrays, representing the 
0372:             *                    horizontal weights of the layout columns 
0373:             *                    and the vertical weights of the layout rows.
0374:             * @since       JDK1.1
0375:             */
0376:            public double[][] getLayoutWeights() {
0377:                if (layoutInfo == null)
0378:                    return new double[2][0];
0379:                double weights[][] = new double[2][];
0380:                weights[0] = new double[layoutInfo.width];
0381:                weights[1] = new double[layoutInfo.height];
0382:                System.arraycopy(layoutInfo.weightX, 0, weights[0], 0,
0383:                        layoutInfo.width);
0384:                System.arraycopy(layoutInfo.weightY, 0, weights[1], 0,
0385:                        layoutInfo.height);
0386:                return weights;
0387:            }
0388:
0389:            /**
0390:             * Determines which cell in the layout grid contains the point
0391:             * specified by <code>(x,&nbsp;y)</code>. Each cell is identified 
0392:             * by its column index (ranging from 0 to the number of columns 
0393:             * minus 1) and its row index (ranging from 0 to the number of 
0394:             * rows minus 1).  
0395:             * <p>
0396:             * If the <code>(x,&nbsp;y)</code> point lies 
0397:             * outside the grid, the following rules are used.  
0398:             * The column index is returned as zero if <code>x</code> lies to the
0399:             * left of the layout, and as the number of columns if <code>x</code> lies
0400:             * to the right of the layout. The row index is returned as zero
0401:             * if <code>y</code> lies above the layout, 
0402:             * and as the number of rows if <code>y</code> lies
0403:             * below the layout.
0404:             * @param      x    the <i>x</i> coordinate of a point.
0405:             * @param      y    the <i>y</i> coordinate of a point.
0406:             * @return     an ordered pair of indexes that indicate which cell 
0407:             *             in the layout grid contains the point 
0408:             *             (<i>x</i>,&nbsp;<i>y</i>).
0409:             * @since      JDK1.1
0410:             */
0411:            public Point location(int x, int y) {
0412:                Point loc = new Point(0, 0);
0413:                int i, d;
0414:                if (layoutInfo == null)
0415:                    return loc;
0416:                d = layoutInfo.startx;
0417:                for (i = 0; i < layoutInfo.width; i++) {
0418:                    d += layoutInfo.minWidth[i];
0419:                    if (d > x)
0420:                        break;
0421:                }
0422:                loc.x = i;
0423:                d = layoutInfo.starty;
0424:                for (i = 0; i < layoutInfo.height; i++) {
0425:                    d += layoutInfo.minHeight[i];
0426:                    if (d > y)
0427:                        break;
0428:                }
0429:                loc.y = i;
0430:                return loc;
0431:            }
0432:
0433:            /**
0434:             * Adds the specified component with the specified name to the layout.
0435:             * @param      name         the name of the component.
0436:             * @param      comp         the component to be added.
0437:             * @since      JDK1.0
0438:             */
0439:            public void addLayoutComponent(String name, Component comp) {
0440:            }
0441:
0442:            /**
0443:             * Adds the specified component to the layout, using the specified
0444:             * constraint object.
0445:             * @param      comp         the component to be added.
0446:             * @param      constraints  an object that determines how 
0447:             *                              the component is added to the layout.
0448:             * @since      JDK1.0
0449:             */
0450:            public void addLayoutComponent(Component comp, Object constraints) {
0451:                if (constraints instanceof  GridBagConstraints) {
0452:                    setConstraints(comp, (GridBagConstraints) constraints);
0453:                } else if (constraints instanceof  String) {//Netscape : Just Ignore it
0454:                } else if (constraints != null) {
0455:                    throw new IllegalArgumentException(
0456:                            "cannot add to layout: constraint must be a GridBagConstraint");
0457:                }
0458:            }
0459:
0460:            /**
0461:             * Removes the specified component from this layout. 
0462:             * <p>
0463:             * Most applications do not call this method directly.  
0464:             * @param    comp   the component to be removed.
0465:             * @see      java.awt.Container#remove(java.awt.Component)
0466:             * @see      java.awt.Container#removeAll()
0467:             * @since    JDK1.0
0468:             */
0469:            public void removeLayoutComponent(Component comp) {
0470:            }
0471:
0472:            /** 
0473:             * Determines the preferred size of the <code>target</code> 
0474:             * container using this grid bag layout. 
0475:             * <p>
0476:             * Most applications do not call this method directly.
0477:             * @param     target   the container in which to do the layout.
0478:             * @see       java.awt.Container#getPreferredSize
0479:             * @since     JDK1.0
0480:             */
0481:            public Dimension preferredLayoutSize(Container parent) {
0482:                GridBagLayoutInfo info = GetLayoutInfo(parent, PREFERREDSIZE);
0483:                return GetMinSize(parent, info);
0484:            }
0485:
0486:            /**
0487:             * Determines the minimum size of the <code>target</code> container 
0488:             * using this grid bag layout. 
0489:             * <p>
0490:             * Most applications do not call this method directly. 
0491:             * @param     target   the container in which to do the layout.
0492:             * @see       java.awt.Container#doLayout
0493:             * @since     JDK1.0
0494:             */
0495:            public Dimension minimumLayoutSize(Container parent) {
0496:                GridBagLayoutInfo info = GetLayoutInfo(parent, MINSIZE);
0497:                return GetMinSize(parent, info);
0498:            }
0499:
0500:            /**
0501:             * Returns the maximum dimensions for this layout given the components
0502:             * in the specified target container.
0503:             * @param target the component which needs to be laid out
0504:             * @see Container
0505:             * @see #minimumLayoutSize
0506:             * @see #preferredLayoutSize
0507:             */
0508:            public Dimension maximumLayoutSize(Container target) {
0509:                return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
0510:            }
0511:
0512:            /**
0513:             * Returns the alignment along the x axis.  This specifies how
0514:             * the component would like to be aligned relative to other 
0515:             * components.  The value should be a number between 0 and 1
0516:             * where 0 represents alignment along the origin, 1 is aligned
0517:             * the furthest away from the origin, 0.5 is centered, etc.
0518:             */
0519:            public float getLayoutAlignmentX(Container parent) {
0520:                return 0.5f;
0521:            }
0522:
0523:            /**
0524:             * Returns the alignment along the y axis.  This specifies how
0525:             * the component would like to be aligned relative to other 
0526:             * components.  The value should be a number between 0 and 1
0527:             * where 0 represents alignment along the origin, 1 is aligned
0528:             * the furthest away from the origin, 0.5 is centered, etc.
0529:             */
0530:            public float getLayoutAlignmentY(Container parent) {
0531:                return 0.5f;
0532:            }
0533:
0534:            /**
0535:             * Invalidates the layout, indicating that if the layout manager
0536:             * has cached information it should be discarded.
0537:             */
0538:            public void invalidateLayout(Container target) {
0539:            }
0540:
0541:            /** 
0542:             * Lays out the specified container using this grid bag layout.
0543:             * This method reshapes components in the specified container in 
0544:             * order to satisfy the contraints of this <code>GridBagLayout</code> 
0545:             * object.
0546:             * <p>
0547:             * Most applications do not call this method directly.
0548:             * @param parent the container in which to do the layout.
0549:             * @see java.awt.Container
0550:             * @see java.awt.Container#doLayout
0551:             * @since JDK1.0
0552:             */
0553:            public void layoutContainer(Container parent) {
0554:                ArrangeGrid(parent);
0555:            }
0556:
0557:            /**
0558:             * Returns a string representation of this grid bag layout's values.
0559:             * @return     a string representation of this grid bag layout.
0560:             * @since      JDK1.0
0561:             */
0562:            public String toString() {
0563:                return getClass().getName();
0564:            }
0565:
0566:            /**
0567:             * Print the layout information.  Useful for debugging.
0568:             */
0569:
0570:            /* DEBUG
0571:             *
0572:             *  protected void DumpLayoutInfo(GridBagLayoutInfo s) {
0573:             *    int x;
0574:             *
0575:             *    System.out.println("Col\tWidth\tWeight");
0576:             *    for (x=0; x<s.width; x++) {
0577:             *      System.out.println(x + "\t" +
0578:             *			 s.minWidth[x] + "\t" +
0579:             *			 s.weightX[x]);
0580:             *    }
0581:             *    System.out.println("Row\tHeight\tWeight");
0582:             *    for (x=0; x<s.height; x++) {
0583:             *      System.out.println(x + "\t" +
0584:             *			 s.minHeight[x] + "\t" +
0585:             *			 s.weightY[x]);
0586:             *    }
0587:             *  }
0588:             */
0589:
0590:            /**
0591:             * Print the layout constraints.  Useful for debugging.
0592:             */
0593:
0594:            /* DEBUG
0595:             *
0596:             *  protected void DumpConstraints(GridBagConstraints constraints) {
0597:             *    System.out.println(
0598:             *		       "wt " +
0599:             *		       constraints.weightx +
0600:             *		       " " +
0601:             *		       constraints.weighty +
0602:             *		       ", " +
0603:             *
0604:             *		       "box " +
0605:             *		       constraints.gridx +
0606:             *		       " " +
0607:             *		       constraints.gridy +
0608:             *		       " " +
0609:             *		       constraints.gridwidth +
0610:             *		       " " +
0611:             *		       constraints.gridheight +
0612:             *		       ", " +
0613:             *
0614:             *		       "min " +
0615:             *		       constraints.minWidth +
0616:             *		       " " +
0617:             *		       constraints.minHeight +
0618:             *		       ", " +
0619:             *
0620:             *		       "pad " +
0621:             *		       constraints.insets.bottom +
0622:             *		       " " +
0623:             *		       constraints.insets.left +
0624:             *		       " " +
0625:             *		       constraints.insets.right +
0626:             *		       " " +
0627:             *		       constraints.insets.top +
0628:             *		       " " +
0629:             *		       constraints.ipadx +
0630:             *		       " " +
0631:             *		       constraints.ipady);
0632:             *  }
0633:             */
0634:
0635:            /*
0636:             * Fill in an instance of the above structure for the current set
0637:             * of managed children.  This requires three passes through the
0638:             * set of children:
0639:             *
0640:             * 1) Figure out the dimensions of the layout grid
0641:             * 2) Determine which cells the components occupy
0642:             * 3) Distribute the weights and min sizes amoung the rows/columns.
0643:             *
0644:             * This also caches the minsizes for all the children when they are
0645:             * first encountered (so subsequent loops don't need to ask again).
0646:             */
0647:
0648:            private GridBagLayoutInfo GetLayoutInfo(Container parent,
0649:                    int sizeflag) {
0650:                synchronized (parent.getTreeLock()) {
0651:                    GridBagLayoutInfo r = new GridBagLayoutInfo();
0652:                    Component comp;
0653:                    GridBagConstraints constraints;
0654:                    Dimension d;
0655:                    Component components[] = parent.getComponents();
0656:                    int compindex, i, j, k, px, py, pixels_diff, nextSize;
0657:                    int curX, curY, curWidth, curHeight, curRow, curCol;
0658:                    double weight_diff, weight, start, size;
0659:                    int xMax[], yMax[];
0660:                    /*
0661:                     * Pass #1
0662:                     *
0663:                     * Figure out the dimensions of the layout grid (use a value of 1 for
0664:                     * zero or negative widths and heights).
0665:                     */
0666:
0667:                    r.width = r.height = 0;
0668:                    curRow = curCol = -1;
0669:                    xMax = new int[MAXGRIDSIZE];
0670:                    yMax = new int[MAXGRIDSIZE];
0671:                    for (compindex = 0; compindex < components.length; compindex++) {
0672:                        comp = components[compindex];
0673:                        if (!comp.isVisible())
0674:                            continue;
0675:                        constraints = lookupConstraints(comp);
0676:                        curX = constraints.gridx;
0677:                        curY = constraints.gridy;
0678:                        curWidth = constraints.gridwidth;
0679:                        if (curWidth <= 0)
0680:                            curWidth = 1;
0681:                        curHeight = constraints.gridheight;
0682:                        if (curHeight <= 0)
0683:                            curHeight = 1;
0684:                        /* If x or y is negative, then use relative positioning: */
0685:                        if (curX < 0 && curY < 0) {
0686:                            if (curRow >= 0)
0687:                                curY = curRow;
0688:                            else if (curCol >= 0)
0689:                                curX = curCol;
0690:                            else
0691:                                curY = 0;
0692:                        }
0693:                        if (curX < 0) {
0694:                            px = 0;
0695:                            for (i = curY; i < (curY + curHeight); i++)
0696:                                px = Math.max(px, xMax[i]);
0697:                            curX = px - curX - 1;
0698:                            if (curX < 0)
0699:                                curX = 0;
0700:                        } else if (curY < 0) {
0701:                            py = 0;
0702:                            for (i = curX; i < (curX + curWidth); i++)
0703:                                py = Math.max(py, yMax[i]);
0704:                            curY = py - curY - 1;
0705:                            if (curY < 0)
0706:                                curY = 0;
0707:                        }
0708:                        /* Adjust the grid width and height */
0709:
0710:                        px = curX + curWidth;
0711:                        r.width = Math.max(r.width, px);
0712:                        py = curY + curHeight;
0713:                        r.height = Math.max(r.height, py);
0714:                        /* Adjust the xMax and yMax arrays */
0715:                        for (i = curX; i < (curX + curWidth); i++) {
0716:                            yMax[i] = py;
0717:                        }
0718:                        for (i = curY; i < (curY + curHeight); i++) {
0719:                            xMax[i] = px;
0720:                        }
0721:                        /* Cache the current slave's size. */
0722:                        if (sizeflag == PREFERREDSIZE)
0723:                            d = comp.getPreferredSize();
0724:                        else
0725:                            d = comp.getMinimumSize();
0726:                        constraints.minWidth = d.width;
0727:                        constraints.minHeight = d.height;
0728:                        /* Zero width and height must mean that this is the last item (or
0729:                         * else something is wrong). */
0730:                        if (constraints.gridheight == 0
0731:                                && constraints.gridwidth == 0)
0732:                            curRow = curCol = -1;
0733:                        /* Zero width starts a new row */
0734:                        if (constraints.gridheight == 0 && curRow < 0)
0735:                            curCol = curX + curWidth;
0736:                        /* Zero height starts a new column */
0737:                        else if (constraints.gridwidth == 0 && curCol < 0)
0738:                            curRow = curY + curHeight;
0739:                    }
0740:                    /*
0741:                     * Apply minimum row/column dimensions
0742:                     */
0743:                    if (columnWidths != null && r.width < columnWidths.length)
0744:                        r.width = columnWidths.length;
0745:                    if (rowHeights != null && r.height < rowHeights.length)
0746:                        r.height = rowHeights.length;
0747:                    /*
0748:                     * Pass #2
0749:                     *
0750:                     * Negative values for gridX are filled in with the current x value.
0751:                     * Negative values for gridY are filled in with the current y value.
0752:                     * Negative or zero values for gridWidth and gridHeight end the current
0753:                     *  row or column, respectively.
0754:                     */
0755:
0756:                    curRow = curCol = -1;
0757:                    xMax = new int[MAXGRIDSIZE];
0758:                    yMax = new int[MAXGRIDSIZE];
0759:                    for (compindex = 0; compindex < components.length; compindex++) {
0760:                        comp = components[compindex];
0761:                        if (!comp.isVisible())
0762:                            continue;
0763:                        constraints = lookupConstraints(comp);
0764:                        curX = constraints.gridx;
0765:                        curY = constraints.gridy;
0766:                        curWidth = constraints.gridwidth;
0767:                        curHeight = constraints.gridheight;
0768:                        /* If x or y is negative, then use relative positioning: */
0769:                        if (curX < 0 && curY < 0) {
0770:                            if (curRow >= 0)
0771:                                curY = curRow;
0772:                            else if (curCol >= 0)
0773:                                curX = curCol;
0774:                            else
0775:                                curY = 0;
0776:                        }
0777:                        if (curX < 0) {
0778:                            if (curHeight <= 0) {
0779:                                curHeight += r.height - curY;
0780:                                if (curHeight < 1)
0781:                                    curHeight = 1;
0782:                            }
0783:                            px = 0;
0784:                            for (i = curY; i < (curY + curHeight); i++)
0785:                                px = Math.max(px, xMax[i]);
0786:                            curX = px - curX - 1;
0787:                            if (curX < 0)
0788:                                curX = 0;
0789:                        } else if (curY < 0) {
0790:                            if (curWidth <= 0) {
0791:                                curWidth += r.width - curX;
0792:                                if (curWidth < 1)
0793:                                    curWidth = 1;
0794:                            }
0795:                            py = 0;
0796:                            for (i = curX; i < (curX + curWidth); i++)
0797:                                py = Math.max(py, yMax[i]);
0798:                            curY = py - curY - 1;
0799:                            if (curY < 0)
0800:                                curY = 0;
0801:                        }
0802:                        if (curWidth <= 0) {
0803:                            curWidth += r.width - curX;
0804:                            if (curWidth < 1)
0805:                                curWidth = 1;
0806:                        }
0807:                        if (curHeight <= 0) {
0808:                            curHeight += r.height - curY;
0809:                            if (curHeight < 1)
0810:                                curHeight = 1;
0811:                        }
0812:                        px = curX + curWidth;
0813:                        py = curY + curHeight;
0814:                        for (i = curX; i < (curX + curWidth); i++) {
0815:                            yMax[i] = py;
0816:                        }
0817:                        for (i = curY; i < (curY + curHeight); i++) {
0818:                            xMax[i] = px;
0819:                        }
0820:                        /* Make negative sizes start a new row/column */
0821:                        if (constraints.gridheight == 0
0822:                                && constraints.gridwidth == 0)
0823:                            curRow = curCol = -1;
0824:                        if (constraints.gridheight == 0 && curRow < 0)
0825:                            curCol = curX + curWidth;
0826:                        else if (constraints.gridwidth == 0 && curCol < 0)
0827:                            curRow = curY + curHeight;
0828:                        /* Assign the new values to the gridbag slave */
0829:                        constraints.tempX = curX;
0830:                        constraints.tempY = curY;
0831:                        constraints.tempWidth = curWidth;
0832:                        constraints.tempHeight = curHeight;
0833:                    }
0834:                    /*
0835:                     * Apply minimum row/column dimensions and weights
0836:                     */
0837:                    if (columnWidths != null)
0838:                        System.arraycopy(columnWidths, 0, r.minWidth, 0,
0839:                                columnWidths.length);
0840:                    if (rowHeights != null)
0841:                        System.arraycopy(rowHeights, 0, r.minHeight, 0,
0842:                                rowHeights.length);
0843:                    if (columnWeights != null)
0844:                        System.arraycopy(columnWeights, 0, r.weightX, 0,
0845:                                columnWeights.length);
0846:                    if (rowWeights != null)
0847:                        System.arraycopy(rowWeights, 0, r.weightY, 0,
0848:                                rowWeights.length);
0849:                    /*
0850:                     * Pass #3
0851:                     *
0852:                     * Distribute the minimun widths and weights:
0853:                     */
0854:
0855:                    nextSize = Integer.MAX_VALUE;
0856:                    for (i = 1; i != Integer.MAX_VALUE; i = nextSize, nextSize = Integer.MAX_VALUE) {
0857:                        for (compindex = 0; compindex < components.length; compindex++) {
0858:                            comp = components[compindex];
0859:                            if (!comp.isVisible())
0860:                                continue;
0861:                            constraints = lookupConstraints(comp);
0862:                            if (constraints.tempWidth == i) {
0863:                                px = constraints.tempX + constraints.tempWidth; /* right column */
0864:                                /* 
0865:                                 * Figure out if we should use this slave\'s weight.  If the weight
0866:                                 * is less than the total weight spanned by the width of the cell,
0867:                                 * then discard the weight.  Otherwise split the difference
0868:                                 * according to the existing weights.
0869:                                 */
0870:
0871:                                weight_diff = constraints.weightx;
0872:                                for (k = constraints.tempX; k < px; k++)
0873:                                    weight_diff -= r.weightX[k];
0874:                                if (weight_diff > 0.0) {
0875:                                    weight = 0.0;
0876:                                    for (k = constraints.tempX; k < px; k++)
0877:                                        weight += r.weightX[k];
0878:                                    for (k = constraints.tempX; weight > 0.0
0879:                                            && k < px; k++) {
0880:                                        double wt = r.weightX[k];
0881:                                        double dx = (wt * weight_diff) / weight;
0882:                                        r.weightX[k] += dx;
0883:                                        weight_diff -= dx;
0884:                                        weight -= wt;
0885:                                    }
0886:                                    /* Assign the remainder to the rightmost cell */
0887:                                    r.weightX[px - 1] += weight_diff;
0888:                                }
0889:                                /*
0890:                                 * Calculate the minWidth array values.
0891:                                 * First, figure out how wide the current slave needs to be.
0892:                                 * Then, see if it will fit within the current minWidth values.
0893:                                 * If it will not fit, add the difference according to the
0894:                                 * weightX array.
0895:                                 */
0896:
0897:                                pixels_diff = constraints.minWidth
0898:                                        + constraints.ipadx
0899:                                        + constraints.insets.left
0900:                                        + constraints.insets.right;
0901:                                for (k = constraints.tempX; k < px; k++)
0902:                                    pixels_diff -= r.minWidth[k];
0903:                                if (pixels_diff > 0) {
0904:                                    weight = 0.0;
0905:                                    for (k = constraints.tempX; k < px; k++)
0906:                                        weight += r.weightX[k];
0907:                                    for (k = constraints.tempX; weight > 0.0
0908:                                            && k < px; k++) {
0909:                                        double wt = r.weightX[k];
0910:                                        int dx = (int) ((wt * ((double) pixels_diff)) / weight);
0911:                                        r.minWidth[k] += dx;
0912:                                        pixels_diff -= dx;
0913:                                        weight -= wt;
0914:                                    }
0915:                                    /* Any leftovers go into the rightmost cell */
0916:                                    r.minWidth[px - 1] += pixels_diff;
0917:                                }
0918:                            } else if (constraints.tempWidth > i
0919:                                    && constraints.tempWidth < nextSize)
0920:                                nextSize = constraints.tempWidth;
0921:                            if (constraints.tempHeight == i) {
0922:                                py = constraints.tempY + constraints.tempHeight; /* bottom row */
0923:                                /* 
0924:                                 * Figure out if we should use this slave\'s weight.  If the weight
0925:                                 * is less than the total weight spanned by the height of the cell,
0926:                                 * then discard the weight.  Otherwise split it the difference
0927:                                 * according to the existing weights.
0928:                                 */
0929:
0930:                                weight_diff = constraints.weighty;
0931:                                for (k = constraints.tempY; k < py; k++)
0932:                                    weight_diff -= r.weightY[k];
0933:                                if (weight_diff > 0.0) {
0934:                                    weight = 0.0;
0935:                                    for (k = constraints.tempY; k < py; k++)
0936:                                        weight += r.weightY[k];
0937:                                    for (k = constraints.tempY; weight > 0.0
0938:                                            && k < py; k++) {
0939:                                        double wt = r.weightY[k];
0940:                                        double dy = (wt * weight_diff) / weight;
0941:                                        r.weightY[k] += dy;
0942:                                        weight_diff -= dy;
0943:                                        weight -= wt;
0944:                                    }
0945:                                    /* Assign the remainder to the bottom cell */
0946:                                    r.weightY[py - 1] += weight_diff;
0947:                                }
0948:                                /*
0949:                                 * Calculate the minHeight array values.
0950:                                 * First, figure out how tall the current slave needs to be.
0951:                                 * Then, see if it will fit within the current minHeight values.
0952:                                 * If it will not fit, add the difference according to the
0953:                                 * weightY array.
0954:                                 */
0955:
0956:                                pixels_diff = constraints.minHeight
0957:                                        + constraints.ipady
0958:                                        + constraints.insets.top
0959:                                        + constraints.insets.bottom;
0960:                                for (k = constraints.tempY; k < py; k++)
0961:                                    pixels_diff -= r.minHeight[k];
0962:                                if (pixels_diff > 0) {
0963:                                    weight = 0.0;
0964:                                    for (k = constraints.tempY; k < py; k++)
0965:                                        weight += r.weightY[k];
0966:                                    for (k = constraints.tempY; weight > 0.0
0967:                                            && k < py; k++) {
0968:                                        double wt = r.weightY[k];
0969:                                        int dy = (int) ((wt * ((double) pixels_diff)) / weight);
0970:                                        r.minHeight[k] += dy;
0971:                                        pixels_diff -= dy;
0972:                                        weight -= wt;
0973:                                    }
0974:                                    /* Any leftovers go into the bottom cell */
0975:                                    r.minHeight[py - 1] += pixels_diff;
0976:                                }
0977:                            } else if (constraints.tempHeight > i
0978:                                    && constraints.tempHeight < nextSize)
0979:                                nextSize = constraints.tempHeight;
0980:                        }
0981:                    }
0982:                    return r;
0983:                }
0984:            }
0985:
0986:            /**
0987:             * Adjusts the x, y, width, and height fields to the correct
0988:             * values depending on the constraint geometry and pads.
0989:             * @param constraints the constraints to be applied
0990:             * @param r the <code>Rectangle</code> to be adjusted
0991:             * @since 1.4
0992:             */
0993:            protected void adjustForGravity(GridBagConstraints constraints,
0994:                    Rectangle r) {
0995:                AdjustForGravity(constraints, r);
0996:            }
0997:
0998:            /*
0999:             * Adjusts the x, y, width, and height fields to the correct
1000:             * values depending on the constraint geometry and pads.
1001:             */
1002:            protected void AdjustForGravity(GridBagConstraints constraints,
1003:                    Rectangle r) {
1004:                int diffx, diffy;
1005:                r.x += constraints.insets.left;
1006:                r.width -= (constraints.insets.left + constraints.insets.right);
1007:                r.y += constraints.insets.top;
1008:                r.height -= (constraints.insets.top + constraints.insets.bottom);
1009:                diffx = 0;
1010:                if ((constraints.fill != GridBagConstraints.HORIZONTAL && constraints.fill != GridBagConstraints.BOTH)
1011:                        && (r.width > (constraints.minWidth + constraints.ipadx))) {
1012:                    diffx = r.width
1013:                            - (constraints.minWidth + constraints.ipadx);
1014:                    r.width = constraints.minWidth + constraints.ipadx;
1015:                }
1016:                diffy = 0;
1017:                if ((constraints.fill != GridBagConstraints.VERTICAL && constraints.fill != GridBagConstraints.BOTH)
1018:                        && (r.height > (constraints.minHeight + constraints.ipady))) {
1019:                    diffy = r.height
1020:                            - (constraints.minHeight + constraints.ipady);
1021:                    r.height = constraints.minHeight + constraints.ipady;
1022:                }
1023:                switch (constraints.anchor) {
1024:                case GridBagConstraints.CENTER:
1025:                    r.x += diffx / 2;
1026:                    r.y += diffy / 2;
1027:                    break;
1028:
1029:                case GridBagConstraints.NORTH:
1030:                    r.x += diffx / 2;
1031:                    break;
1032:
1033:                case GridBagConstraints.NORTHEAST:
1034:                    r.x += diffx;
1035:                    break;
1036:
1037:                case GridBagConstraints.EAST:
1038:                    r.x += diffx;
1039:                    r.y += diffy / 2;
1040:                    break;
1041:
1042:                case GridBagConstraints.SOUTHEAST:
1043:                    r.x += diffx;
1044:                    r.y += diffy;
1045:                    break;
1046:
1047:                case GridBagConstraints.SOUTH:
1048:                    r.x += diffx / 2;
1049:                    r.y += diffy;
1050:                    break;
1051:
1052:                case GridBagConstraints.SOUTHWEST:
1053:                    r.y += diffy;
1054:                    break;
1055:
1056:                case GridBagConstraints.WEST:
1057:                    r.y += diffy / 2;
1058:                    break;
1059:
1060:                case GridBagConstraints.NORTHWEST:
1061:                    break;
1062:
1063:                default:
1064:                    throw new IllegalArgumentException("illegal anchor value");
1065:                }
1066:            }
1067:
1068:            /*
1069:             * Figure out the minimum size of the
1070:             * master based on the information from GetLayoutInfo()
1071:             */
1072:            private Dimension GetMinSize(Container parent,
1073:                    GridBagLayoutInfo info) {
1074:                Dimension d = new Dimension();
1075:                int i, t;
1076:                Insets insets = parent.getInsets();
1077:                t = 0;
1078:                for (i = 0; i < info.width; i++)
1079:                    t += info.minWidth[i];
1080:                d.width = t + insets.left + insets.right;
1081:                t = 0;
1082:                for (i = 0; i < info.height; i++)
1083:                    t += info.minHeight[i];
1084:                d.height = t + insets.top + insets.bottom;
1085:                return d;
1086:            }
1087:
1088:            /**
1089:             * Lays out the grid.
1090:             * @param parent the layout container
1091:             * @since 1.4
1092:             */
1093:            protected void arrangeGrid(Container parent) {
1094:                ArrangeGrid(parent);
1095:            }
1096:
1097:            /*
1098:             * Lay out the grid
1099:             */
1100:            protected void ArrangeGrid(Container parent) {
1101:                Component comp;
1102:                int compindex;
1103:                GridBagConstraints constraints;
1104:                Insets insets = parent.getInsets();
1105:                Component components[] = parent.getComponents();
1106:                Dimension d;
1107:                Rectangle r = new Rectangle();
1108:                int i, diffw, diffh;
1109:                double weight;
1110:                GridBagLayoutInfo info;
1111:                /*
1112:                 * If the parent has no slaves anymore, then don't do anything
1113:                 * at all:  just leave the parent's size as-is.
1114:                 */
1115:                if (components.length == 0
1116:                        && (columnWidths == null || columnWidths.length == 0)
1117:                        && (rowHeights == null || rowHeights.length == 0)) {
1118:                    return;
1119:                }
1120:                /*
1121:                 * Pass #1: scan all the slaves to figure out the total amount
1122:                 * of space needed.
1123:                 */
1124:
1125:                info = GetLayoutInfo(parent, PREFERREDSIZE);
1126:                d = GetMinSize(parent, info);
1127:                if (parent.width < d.width || parent.height < d.height) {
1128:                    info = GetLayoutInfo(parent, MINSIZE);
1129:                    d = GetMinSize(parent, info);
1130:                }
1131:                layoutInfo = info;
1132:                r.width = d.width;
1133:                r.height = d.height;
1134:                /*
1135:                 * DEBUG
1136:                 *
1137:                 * DumpLayoutInfo(info);
1138:                 * for (compindex = 0 ; compindex < components.length ; compindex++) {
1139:                 * comp = components[compindex];
1140:                 * if (!comp.isVisible())
1141:                 *	continue;
1142:                 * constraints = lookupConstraints(comp);
1143:                 * DumpConstraints(constraints);
1144:                 * }
1145:                 * System.out.println("minSize " + r.width + " " + r.height);
1146:                 */
1147:
1148:                /*
1149:                 * If the current dimensions of the window don't match the desired
1150:                 * dimensions, then adjust the minWidth and minHeight arrays
1151:                 * according to the weights.
1152:                 */
1153:
1154:                diffw = parent.width - r.width;
1155:                if (diffw != 0) {
1156:                    weight = 0.0;
1157:                    for (i = 0; i < info.width; i++)
1158:                        weight += info.weightX[i];
1159:                    if (weight > 0.0) {
1160:                        for (i = 0; i < info.width; i++) {
1161:                            int dx = (int) ((((double) diffw) * info.weightX[i]) / weight);
1162:                            info.minWidth[i] += dx;
1163:                            r.width += dx;
1164:                            if (info.minWidth[i] < 0) {
1165:                                r.width -= info.minWidth[i];
1166:                                info.minWidth[i] = 0;
1167:                            }
1168:                        }
1169:                    }
1170:                    diffw = parent.width - r.width;
1171:                } else {
1172:                    diffw = 0;
1173:                }
1174:                diffh = parent.height - r.height;
1175:                if (diffh != 0) {
1176:                    weight = 0.0;
1177:                    for (i = 0; i < info.height; i++)
1178:                        weight += info.weightY[i];
1179:                    if (weight > 0.0) {
1180:                        for (i = 0; i < info.height; i++) {
1181:                            int dy = (int) ((((double) diffh) * info.weightY[i]) / weight);
1182:                            info.minHeight[i] += dy;
1183:                            r.height += dy;
1184:                            if (info.minHeight[i] < 0) {
1185:                                r.height -= info.minHeight[i];
1186:                                info.minHeight[i] = 0;
1187:                            }
1188:                        }
1189:                    }
1190:                    diffh = parent.height - r.height;
1191:                } else {
1192:                    diffh = 0;
1193:                }
1194:                /*
1195:                 * DEBUG
1196:                 *
1197:                 * System.out.println("Re-adjusted:");
1198:                 * DumpLayoutInfo(info);
1199:                 */
1200:
1201:                /*
1202:                 * Now do the actual layout of the slaves using the layout information
1203:                 * that has been collected.
1204:                 */
1205:
1206:                info.startx = diffw / 2 + insets.left;
1207:                info.starty = diffh / 2 + insets.top;
1208:                for (compindex = 0; compindex < components.length; compindex++) {
1209:                    comp = components[compindex];
1210:                    if (!comp.isVisible())
1211:                        continue;
1212:                    constraints = lookupConstraints(comp);
1213:                    r.x = info.startx;
1214:                    for (i = 0; i < constraints.tempX; i++)
1215:                        r.x += info.minWidth[i];
1216:                    r.y = info.starty;
1217:                    for (i = 0; i < constraints.tempY; i++)
1218:                        r.y += info.minHeight[i];
1219:                    r.width = 0;
1220:                    for (i = constraints.tempX; i < (constraints.tempX + constraints.tempWidth); i++) {
1221:                        r.width += info.minWidth[i];
1222:                    }
1223:                    r.height = 0;
1224:                    for (i = constraints.tempY; i < (constraints.tempY + constraints.tempHeight); i++) {
1225:                        r.height += info.minHeight[i];
1226:                    }
1227:                    AdjustForGravity(constraints, r);
1228:                    /*
1229:                     * If the window is too small to be interesting then
1230:                     * unmap it.  Otherwise configure it and then make sure
1231:                     * it's mapped.
1232:                     */
1233:
1234:                    if ((r.width <= 0) || (r.height <= 0)) {
1235:                        comp.setBounds(0, 0, 0, 0);
1236:                    } else {
1237:                        if (comp.x != r.x || comp.y != r.y
1238:                                || comp.width != r.width
1239:                                || comp.height != r.height) {
1240:                            comp.setBounds(r.x, r.y, r.width, r.height);
1241:                        }
1242:                    }
1243:                }
1244:            }
1245:
1246:            // Added for serial backwards compatability (4348425)
1247:            static final long serialVersionUID = 8838754796412211005L;
1248:        }
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