J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | package sun.swing; |
| 26 | |
| 27 | import java.awt.Container; |
| 28 | import java.awt.Insets; |
| 29 | import javax.swing.*; |
| 30 | import javax.swing.LayoutStyle.ComponentPlacement; |
| 31 | import javax.swing.border.Border; |
| 32 | import javax.swing.plaf.UIResource; |
| 33 | |
| 34 | /** |
| 35 | * An implementation of <code>LayoutStyle</code> that returns 6 for related |
| 36 | * components, otherwise 12. This class also provides helper methods for |
| 37 | * subclasses. |
| 38 | * |
| 39 | */ |
| 40 | public class DefaultLayoutStyle extends LayoutStyle { |
| 41 | private static final DefaultLayoutStyle INSTANCE = |
| 42 | new DefaultLayoutStyle(); |
| 43 | |
| 44 | public static LayoutStyle getInstance() { |
| 45 | return INSTANCE; |
| 46 | } |
| 47 | |
| 48 | @Override |
| 49 | public int getPreferredGap(JComponent component1, JComponent component2, |
| 50 | ComponentPlacement type, int position, Container parent) { |
| 51 | |
| 52 | if (component1 == null || component2 == null || type == null) { |
| 53 | throw new NullPointerException(); |
| 54 | } |
| 55 | if (type == ComponentPlacement.INDENT && |
| 56 | (position == SwingConstants.EAST || |
| 57 | position == SwingConstants.WEST)) { |
| 58 | int indent = getIndent(component1, position); |
| 59 | if (indent > 0) { |
| 60 | return indent; |
| 61 | } |
| 62 | } |
| 63 | return (type == ComponentPlacement.UNRELATED) ? 12 : 6; |
| 64 | } |
| 65 | |
| 66 | @Override |
| 67 | public int getContainerGap(JComponent component, int position, |
| 68 | Container parent) { |
| 69 | if (component == null) { |
| 70 | throw new NullPointerException(); |
| 71 | } |
| 72 | checkPosition(position); |
| 73 | return 6; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Returns true if the classes identify a JLabel and a non-JLabel |
| 78 | * along the horizontal axis. |
| 79 | */ |
| 80 | protected boolean isLabelAndNonlabel(JComponent c1, JComponent c2, |
| 81 | int position) { |
| 82 | if (position == SwingConstants.EAST || |
| 83 | position == SwingConstants.WEST) { |
| 84 | boolean c1Label = (c1 instanceof JLabel); |
| 85 | boolean c2Label = (c2 instanceof JLabel); |
| 86 | return ((c1Label || c2Label) && (c1Label != c2Label)); |
| 87 | } |
| 88 | return false; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * For some look and feels check boxs and radio buttons typically |
| 93 | * don't paint the border, yet they have padding for a border. Look |
| 94 | * and feel guidelines generally don't include this space. Use |
| 95 | * this method to subtract this space from the specified |
| 96 | * components. |
| 97 | * |
| 98 | * @param source First component |
| 99 | * @param target Second component |
| 100 | * @param position Position doing layout along. |
| 101 | * @param offset Ideal offset, not including border/margin |
| 102 | * @return offset - border/margin around the component. |
| 103 | */ |
| 104 | protected int getButtonGap(JComponent source, JComponent target, |
| 105 | int position, int offset) { |
| 106 | offset -= getButtonGap(source, position); |
| 107 | if (offset > 0) { |
| 108 | offset -= getButtonGap(target, flipDirection(position)); |
| 109 | } |
| 110 | if (offset < 0) { |
| 111 | return 0; |
| 112 | } |
| 113 | return offset; |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * For some look and feels check boxs and radio buttons typically |
| 118 | * don't paint the border, yet they have padding for a border. Look |
| 119 | * and feel guidelines generally don't include this space. Use |
| 120 | * this method to subtract this space from the specified |
| 121 | * components. |
| 122 | * |
| 123 | * @param source Component |
| 124 | * @param position Position doing layout along. |
| 125 | * @param offset Ideal offset, not including border/margin |
| 126 | * @return offset - border/margin around the component. |
| 127 | */ |
| 128 | protected int getButtonGap(JComponent source, int position, int offset) { |
| 129 | offset -= getButtonGap(source, position); |
| 130 | return Math.max(offset, 0); |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * If <code>c</code> is a check box or radio button, and the border is |
| 135 | * not painted this returns the inset along the specified axis. |
| 136 | */ |
| 137 | public int getButtonGap(JComponent c, int position) { |
| 138 | String classID = c.getUIClassID(); |
| 139 | if ((classID == "CheckBoxUI" || classID == "RadioButtonUI") && |
| 140 | !((AbstractButton)c).isBorderPainted()) { |
| 141 | Border border = c.getBorder(); |
| 142 | if (border instanceof UIResource) { |
| 143 | return getInset(c, position); |
| 144 | } |
| 145 | } |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | private void checkPosition(int position) { |
| 150 | if (position != SwingConstants.NORTH && |
| 151 | position != SwingConstants.SOUTH && |
| 152 | position != SwingConstants.WEST && |
| 153 | position != SwingConstants.EAST) { |
| 154 | throw new IllegalArgumentException(); |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | protected int flipDirection(int position) { |
| 159 | switch(position) { |
| 160 | case SwingConstants.NORTH: |
| 161 | return SwingConstants.SOUTH; |
| 162 | case SwingConstants.SOUTH: |
| 163 | return SwingConstants.NORTH; |
| 164 | case SwingConstants.EAST: |
| 165 | return SwingConstants.WEST; |
| 166 | case SwingConstants.WEST: |
| 167 | return SwingConstants.EAST; |
| 168 | } |
| 169 | assert false; |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Returns the amount to indent the specified component if it's |
| 175 | * a JCheckBox or JRadioButton. If the component is not a JCheckBox or |
| 176 | * JRadioButton, 0 will be returned. |
| 177 | */ |
| 178 | protected int getIndent(JComponent c, int position) { |
| 179 | String classID = c.getUIClassID(); |
| 180 | if (classID == "CheckBoxUI" || classID == "RadioButtonUI") { |
| 181 | AbstractButton button = (AbstractButton)c; |
| 182 | Insets insets = c.getInsets(); |
| 183 | Icon icon = getIcon(button); |
| 184 | int gap = button.getIconTextGap(); |
| 185 | if (isLeftAligned(button, position)) { |
| 186 | return insets.left + icon.getIconWidth() + gap; |
| 187 | } else if (isRightAligned(button, position)) { |
| 188 | return insets.right + icon.getIconWidth() + gap; |
| 189 | } |
| 190 | } |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | private Icon getIcon(AbstractButton button) { |
| 195 | Icon icon = button.getIcon(); |
| 196 | if (icon != null) { |
| 197 | return icon; |
| 198 | } |
| 199 | String key = null; |
| 200 | if (button instanceof JCheckBox) { |
| 201 | key = "CheckBox.icon"; |
| 202 | } else if (button instanceof JRadioButton) { |
| 203 | key = "RadioButton.icon"; |
| 204 | } |
| 205 | if (key != null) { |
| 206 | Object oIcon = UIManager.get(key); |
| 207 | if (oIcon instanceof Icon) { |
| 208 | return (Icon)oIcon; |
| 209 | } |
| 210 | } |
| 211 | return null; |
| 212 | } |
| 213 | |
| 214 | private boolean isLeftAligned(AbstractButton button, int position) { |
| 215 | if (position == SwingConstants.WEST) { |
| 216 | boolean ltr = button.getComponentOrientation().isLeftToRight(); |
| 217 | int hAlign = button.getHorizontalAlignment(); |
| 218 | return ((ltr && (hAlign == SwingConstants.LEFT || |
| 219 | hAlign == SwingConstants.LEADING)) || |
| 220 | (!ltr && (hAlign == SwingConstants.TRAILING))); |
| 221 | } |
| 222 | return false; |
| 223 | } |
| 224 | |
| 225 | private boolean isRightAligned(AbstractButton button, int position) { |
| 226 | if (position == SwingConstants.EAST) { |
| 227 | boolean ltr = button.getComponentOrientation().isLeftToRight(); |
| 228 | int hAlign = button.getHorizontalAlignment(); |
| 229 | return ((ltr && (hAlign == SwingConstants.RIGHT || |
| 230 | hAlign == SwingConstants.TRAILING)) || |
| 231 | (!ltr && (hAlign == SwingConstants.LEADING))); |
| 232 | } |
| 233 | return false; |
| 234 | } |
| 235 | |
| 236 | private int getInset(JComponent c, int position) { |
| 237 | return getInset(c.getInsets(), position); |
| 238 | } |
| 239 | |
| 240 | private int getInset(Insets insets, int position) { |
| 241 | if (insets == null) { |
| 242 | return 0; |
| 243 | } |
| 244 | switch(position) { |
| 245 | case SwingConstants.NORTH: |
| 246 | return insets.top; |
| 247 | case SwingConstants.SOUTH: |
| 248 | return insets.bottom; |
| 249 | case SwingConstants.EAST: |
| 250 | return insets.right; |
| 251 | case SwingConstants.WEST: |
| 252 | return insets.left; |
| 253 | } |
| 254 | assert false; |
| 255 | return 0; |
| 256 | } |
| 257 | } |