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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 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.awt; | |
| 26 | + | |
| 27 | +import java.awt.*; | |
| 28 | + | |
| 29 | +/** | |
| 30 | + * Extends the FlowLayout class to support both vertical and horizontal | |
| 31 | + * layout of components. Orientation can be changed dynamically after | |
| 32 | + * creation by calling either of the methods @method orientHorizontally or | |
| 33 | + * @method orientVertically. Separate values for alignment, vertical gap, | |
| 34 | + * and horizontal gap can be specified for horizontal and vertical | |
| 35 | + * orientation. | |
| 36 | + * | |
| 37 | + * @author Terry Cline | |
| 38 | + */ | |
| 39 | +public class OrientableFlowLayout extends FlowLayout { | |
| 40 | + /** | |
| 41 | + * The horizontal orientation constant. | |
| 42 | + */ | |
| 43 | + public static final int HORIZONTAL = 0; | |
| 44 | + | |
| 45 | + /** | |
| 46 | + * The vertical orientation constant. | |
| 47 | + */ | |
| 48 | + public static final int VERTICAL = 1; | |
| 49 | + | |
| 50 | + /** | |
| 51 | + * The top vertical alignment constant. | |
| 52 | + */ | |
| 53 | + public static final int TOP = 0; | |
| 54 | + | |
| 55 | + /** | |
| 56 | + * The bottom vertical alignment constant. | |
| 57 | + */ | |
| 58 | + public static final int BOTTOM = 2; // CENTER == 1 | |
| 59 | + | |
| 60 | + int orientation; | |
| 61 | + int vAlign; | |
| 62 | + int vHGap; | |
| 63 | + int vVGap; | |
| 64 | + | |
| 65 | + /** | |
| 66 | + * Constructs a new flow layout with a horizontal orientation and | |
| 67 | + * centered alignment. | |
| 68 | + */ | |
| 69 | + public OrientableFlowLayout() { | |
| 70 | + this(HORIZONTAL, CENTER, CENTER, 5, 5, 5, 5); | |
| 71 | + } | |
| 72 | + | |
| 73 | + /** | |
| 74 | + * Constructs a new flow layout with the specified orientation and | |
| 75 | + * a centered alignment. | |
| 76 | + * | |
| 77 | + * @param orientation the orientation, one of HORIZONTAL or VERTICAL. | |
| 78 | + */ | |
| 79 | + public OrientableFlowLayout(int orientation) { | |
| 80 | + this(orientation, CENTER, CENTER, 5, 5, 5, 5); | |
| 81 | + } | |
| 82 | + | |
| 83 | + /** | |
| 84 | + * Constructs a new flow layout with the specified orientation and | |
| 85 | + * alignment. | |
| 86 | + * | |
| 87 | + * @param orientation the orientation, one of HORIZONTAL or VERTICAL. | |
| 88 | + * @param hAlign the horizontal alignment, one of LEFT, CENTER, or RIGHT. | |
| 89 | + * @param vAlign the vertical alignment, one of TOP, CENTER, or BOTTOM. | |
| 90 | + */ | |
| 91 | + public OrientableFlowLayout(int orientation, int hAlign, int vAlign) { | |
| 92 | + this(orientation, hAlign, vAlign, 5, 5, 5, 5); | |
| 93 | + } | |
| 94 | + | |
| 95 | + /** | |
| 96 | + * Constructs a new flow layout with the specified orientation, | |
| 97 | + * alignment, and gap values. | |
| 98 | + * | |
| 99 | + * @param orientation the orientation, one of HORIZONTAL or VERTICAL. | |
| 100 | + * @param hAlign the horizontal alignment, one of LEFT, CENTER, or RIGHT. | |
| 101 | + * @param vAlign the vertical alignment, one of TOP, CENTER, or BOTTOM. | |
| 102 | + * @param hHGap the horizontal gap between components in HORIZONTAL. | |
| 103 | + * @param hVGap the vertical gap between components in HORIZONTAL. | |
| 104 | + * @param vHGap the horizontal gap between components in VERTICAL. | |
| 105 | + * @param vVGap the vertical gap between components in VERTICAL. | |
| 106 | + */ | |
| 107 | + public OrientableFlowLayout(int orientation, int hAlign, int vAlign, int hHGap, int hVGap, int vHGap, int vVGap) { | |
| 108 | + super(hAlign, hHGap, hVGap); | |
| 109 | + this.orientation = orientation; | |
| 110 | + this.vAlign = vAlign; | |
| 111 | + this.vHGap = vHGap; | |
| 112 | + this.vVGap = vVGap; | |
| 113 | + } | |
| 114 | + | |
| 115 | + /** | |
| 116 | + * Set the layout's current orientation to horizontal. | |
| 117 | + */ | |
| 118 | + public synchronized void orientHorizontally() { | |
| 119 | + orientation = HORIZONTAL; | |
| 120 | + } | |
| 121 | + | |
| 122 | + /** | |
| 123 | + * Set the layout's current orientation to vertical. | |
| 124 | + */ | |
| 125 | + public synchronized void orientVertically() { | |
| 126 | + orientation = VERTICAL; | |
| 127 | + } | |
| 128 | + | |
| 129 | + /** | |
| 130 | + * Returns the preferred dimensions for this layout given the | |
| 131 | + * components in the specified target container. | |
| 132 | + * | |
| 133 | + * @param target the component which needs to be laid out. | |
| 134 | + * @see Container | |
| 135 | + * @see FlowLayout | |
| 136 | + * @see #minimumLayoutSize | |
| 137 | + */ | |
| 138 | + public Dimension preferredLayoutSize(Container target) { | |
| 139 | + if (orientation == HORIZONTAL) { | |
| 140 | + return super.preferredLayoutSize(target); | |
| 141 | + } | |
| 142 | + else { | |
| 143 | + Dimension dim = new Dimension(0, 0); | |
| 144 | + | |
| 145 | + int n = target.countComponents(); | |
| 146 | + for (int i = 0; i < n; i++) { | |
| 147 | + Component c = target.getComponent(i); | |
| 148 | + if (c.isVisible()) { | |
| 149 | + Dimension cDim = c.preferredSize(); | |
| 150 | + dim.width = Math.max(dim.width, cDim.width); | |
| 151 | + if (i > 0) { | |
| 152 | + dim.height += vVGap; | |
| 153 | + } | |
| 154 | + dim.height += cDim.height; | |
| 155 | + } | |
| 156 | + } | |
| 157 | + | |
| 158 | + Insets insets = target.insets();; | |
| 159 | + dim.width += insets.left + insets.right + vHGap*2; | |
| 160 | + dim.height += insets.top + insets.bottom + vVGap*2; | |
| 161 | + | |
| 162 | + return dim; | |
| 163 | + } | |
| 164 | + } | |
| 165 | + | |
| 166 | + /** | |
| 167 | + * Returns the minimum dimensions needed to layout the components | |
| 168 | + * contained in the specified target container. | |
| 169 | + * | |
| 170 | + * @param target the component which needs to be laid out. | |
| 171 | + * @see #preferredLayoutSize. | |
| 172 | + */ | |
| 173 | + public Dimension minimumLayoutSize(Container target) { | |
| 174 | + if (orientation == HORIZONTAL) { | |
| 175 | + return super.minimumLayoutSize(target); | |
| 176 | + } | |
| 177 | + else { | |
| 178 | + Dimension dim = new Dimension(0, 0); | |
| 179 | + | |
| 180 | + int n = target.countComponents(); | |
| 181 | + for (int i = 0; i < n; i++) { | |
| 182 | + Component c = target.getComponent(i); | |
| 183 | + if (c.isVisible()) { | |
| 184 | + Dimension cDim = c.minimumSize(); | |
| 185 | + dim.width = Math.max(dim.width, cDim.width); | |
| 186 | + if (i > 0) { | |
| 187 | + dim.height += vVGap; | |
| 188 | + } | |
| 189 | + dim.height += cDim.height; | |
| 190 | + } | |
| 191 | + } | |
| 192 | + | |
| 193 | + Insets insets = target.insets(); | |
| 194 | + dim.width += insets.left + insets.right + vHGap*2; | |
| 195 | + dim.height += insets.top + insets.bottom + vVGap*2; | |
| 196 | + | |
| 197 | + return dim; | |
| 198 | + } | |
| 199 | + } | |
| 200 | + | |
| 201 | + /** | |
| 202 | + * Lays out the container. This method will reshape the | |
| 203 | + * components in the target to satisfy the constraints of the | |
| 204 | + * layout. | |
| 205 | + * | |
| 206 | + * @param target the specified component being laid out. | |
| 207 | + * @see Container. | |
| 208 | + */ | |
| 209 | + public void layoutContainer(Container target) { | |
| 210 | + if (orientation == HORIZONTAL) { | |
| 211 | + super.layoutContainer(target); | |
| 212 | + } | |
| 213 | + else { | |
| 214 | + Insets insets = target.insets(); | |
| 215 | + Dimension targetDim = target.size(); | |
| 216 | + int maxHeight = targetDim.height - (insets.top + insets.bottom + vVGap*2); | |
| 217 | + int x = insets.left + vHGap; | |
| 218 | + int y = 0; | |
| 219 | + int colWidth = 0; | |
| 220 | + int start = 0; | |
| 221 | + | |
| 222 | + int n = target.countComponents(); | |
| 223 | + for (int i = 0; i < n; i++) { | |
| 224 | + Component c = target.getComponent(i); | |
| 225 | + if (c.isVisible()) { | |
| 226 | + Dimension cDim = c.preferredSize(); | |
| 227 | + c.resize(cDim.width, cDim.height); | |
| 228 | + | |
| 229 | + if ((y == 0) || ((y + cDim.height) <= maxHeight)) { | |
| 230 | + if (y > 0) { | |
| 231 | + y += vVGap; | |
| 232 | + } | |
| 233 | + y += cDim.height; | |
| 234 | + colWidth = Math.max(colWidth, cDim.width); | |
| 235 | + } | |
| 236 | + else { | |
| 237 | + moveComponents(target, | |
| 238 | + x, | |
| 239 | + insets.top + vVGap, | |
| 240 | + colWidth, | |
| 241 | + maxHeight - y, | |
| 242 | + start, | |
| 243 | + i); | |
| 244 | + x += vHGap + colWidth; | |
| 245 | + y = cDim.width; | |
| 246 | + colWidth = cDim.width; | |
| 247 | + start = i; | |
| 248 | + } | |
| 249 | + } | |
| 250 | + } | |
| 251 | + | |
| 252 | + moveComponents(target, | |
| 253 | + x, | |
| 254 | + insets.top + vVGap, | |
| 255 | + colWidth, | |
| 256 | + maxHeight - y, | |
| 257 | + start, | |
| 258 | + n); | |
| 259 | + } | |
| 260 | + } | |
| 261 | + | |
| 262 | + /** | |
| 263 | + * Aligns the components vertically if there is any slack. | |
| 264 | + * | |
| 265 | + * @param target the container whose components need to be moved. | |
| 266 | + * @param x the x coordinate. | |
| 267 | + * @param y the y coordinate. | |
| 268 | + * @param width the width available. | |
| 269 | + * @param height the height available. | |
| 270 | + * @param colStart the beginning of the column. | |
| 271 | + * @param colEnd the end of the column. | |
| 272 | + */ | |
| 273 | + private void moveComponents(Container target, int x, int y, int width, int height, int colStart, int colEnd) { | |
| 274 | + switch (vAlign) { | |
| 275 | + case TOP: | |
| 276 | + break; | |
| 277 | + case CENTER: | |
| 278 | + y += height/2; | |
| 279 | + break; | |
| 280 | + case BOTTOM: | |
| 281 | + y += height; | |
| 282 | + } | |
| 283 | + | |
| 284 | + for (int i = colStart; i < colEnd; i++) { | |
| 285 | + Component c = target.getComponent(i); | |
| 286 | + Dimension cDim = c.size(); | |
| 287 | + if (c.isVisible()) { | |
| 288 | + c.move(x + (width - cDim.width)/2, y); | |
| 289 | + y += vVGap + cDim.height; | |
| 290 | + } | |
| 291 | + } | |
| 292 | + } | |
| 293 | + | |
| 294 | + /** | |
| 295 | + * Returns the String representation of this layout's values. | |
| 296 | + */ | |
| 297 | + public String toString() { | |
| 298 | + String str = ""; | |
| 299 | + switch (orientation) { | |
| 300 | + case HORIZONTAL: | |
| 301 | + str = "orientation=horizontal, "; | |
| 302 | + break; | |
| 303 | + case VERTICAL: | |
| 304 | + str = "orientation=vertical, "; | |
| 305 | + break; | |
| 306 | + } | |
| 307 | + | |
| 308 | + return getClass().getName() + "[" + str + super.toString() + "]"; | |
| 309 | + } | |
| 310 | +} | |