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 }