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| 1 | /* | ||
| 2 | * Copyright (c) 2005, 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 | 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 | } | ||