1 /*

     2  * Copyright (c) 1995, 2007, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package sun.awt;

    27 

    28 import java.awt.*;

    29 

    30 /**

    31  * A horizontal 'bag' of Components.  Allocates space for each Component

    32  * from left to right.

    33  *

    34  * @author      Herb Jellinek

    35  */

    36 public class HorizBagLayout implements LayoutManager {

    37 

    38     int hgap;

    39 

    40     /**

    41      * Constructs a new HorizBagLayout.

    42      */

    43     public HorizBagLayout() {

    44         this(0);

    45     }

    46 

    47     /**

    48      * Constructs a HorizBagLayout with the specified gaps.

    49      * @param hgap the horizontal gap

    50      */

    51     public HorizBagLayout(int hgap) {

    52         this.hgap = hgap;

    53     }

    54 

    55     /**

    56      * Adds the specified named component to the layout.

    57      * @param name the String name

    58      * @param comp the component to be added

    59      */

    60     public void addLayoutComponent(String name, Component comp) {

    61     }

    62 

    63     /**

    64      * Removes the specified component from the layout.

    65      * @param comp the component to be removed

    66      */

    67     public void removeLayoutComponent(Component comp) {

    68     }

    69 

    70     /**

    71      * Returns the minimum dimensions needed to lay out the components

    72      * contained in the specified target container.

    73      * @param target the Container on which to do the layout

    74      * @see Container

    75      * @see #preferredLayoutSize

    76      */

    77     public Dimension minimumLayoutSize(Container target) {

    78         Dimension dim = new Dimension();

    79 

    80         for (int i = 0; i < target.countComponents(); i++) {

    81             Component comp = target.getComponent(i);

    82             if (comp.isVisible()) {

    83                 Dimension d = comp.minimumSize();

    84                 dim.width += d.width + hgap;

    85                 dim.height = Math.max(d.height, dim.height);

    86             }

    87         }

    88 

    89         Insets insets = target.insets();

    90         dim.width += insets.left + insets.right;

    91         dim.height += insets.top + insets.bottom;

    92 

    93         return dim;

    94     }

    95 

    96     /**

    97      * Returns the preferred dimensions for this layout given the components

    98      * in the specified target container.

    99      * @param target the component which needs to be laid out

   100      * @see Container

   101      * @see #minimumLayoutSize

   102      */

   103     public Dimension preferredLayoutSize(Container target) {

   104         Dimension dim = new Dimension();

   105 

   106         for (int i = 0; i < target.countComponents(); i++) {

   107             Component comp = target.getComponent(i);

   108             if (comp.isVisible()) {

   109                 Dimension d = comp.preferredSize();

   110                 dim.width += d.width + hgap;

   111                 dim.height = Math.max(dim.height, d.height);

   112             }

   113         }

   114 

   115         Insets insets = target.insets();

   116         dim.width += insets.left + insets.right;

   117         dim.height += insets.top + insets.bottom;

   118 

   119         return dim;

   120     }

   121 

   122     /**

   123      * Lays out the specified container. This method will actually reshape the

   124      * components in the specified target container in order to satisfy the

   125      * constraints of the HorizBagLayout object.

   126      * @param target the component being laid out

   127      * @see Container

   128      */

   129     public void layoutContainer(Container target) {

   130         Insets insets = target.insets();

   131         int top = insets.top;

   132         int bottom = target.size().height - insets.bottom;

   133         int left = insets.left;

   134         int right = target.size().width - insets.right;

   135 

   136         for (int i = 0; i < target.countComponents(); i++) {

   137             Component comp = target.getComponent(i);

   138             if (comp.isVisible()) {

   139                 int compWidth = comp.size().width;

   140                 comp.resize(compWidth, bottom - top);

   141                 Dimension d = comp.preferredSize();

   142                 comp.reshape(left, top, d.width, bottom - top);

   143                 left += d.width + hgap;

   144             }

   145         }

   146     }

   147 

   148     /**

   149      * Returns the String representation of this HorizBagLayout's values.

   150      */

   151     public String toString() {

   152         return getClass().getName() + "[hgap=" + hgap + "]";

   153     }

   154 }