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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2003, 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 javax.swing.text.html; | ||
| 26 | |||
| 27 | import java.awt.*; | ||
| 28 | import java.util.*; | ||
| 29 | import javax.swing.*; | ||
| 30 | import javax.swing.text.*; | ||
| 31 | import javax.swing.event.*; | ||
| 32 | |||
| 33 | /** | ||
| 34 | * Implements a FrameSetView, intended to support the HTML | ||
| 35 | * <FRAMESET> tag. Supports the ROWS and COLS attributes. | ||
| 36 | * | ||
| 37 | * @author Sunita Mani | ||
| 38 | * | ||
| 39 | * Credit also to the hotjava browser engineers that | ||
| 40 | * worked on making the allocation of space algorithms | ||
| 41 | * conform to the HTML 4.0 standard and also be netscape | ||
| 42 | * compatible. | ||
| 43 | * | ||
| 44 | */ | ||
| 45 | |||
| 46 | class FrameSetView extends javax.swing.text.BoxView { | ||
| 47 | |||
| 48 | String[] children; | ||
| 49 | int[] percentChildren; | ||
| 50 | int[] absoluteChildren; | ||
| 51 | int[] relativeChildren; | ||
| 52 | int percentTotals; | ||
| 53 | int absoluteTotals; | ||
| 54 | int relativeTotals; | ||
| 55 | |||
| 56 | /** | ||
| 57 | * Constructs a FrameSetView for the given element. | ||
| 58 | * | ||
| 59 | * @param elem the element that this view is responsible for | ||
| 60 | */ | ||
| 61 | public FrameSetView(Element elem, int axis) { | ||
| 62 | super(elem, axis); | ||
| 63 | children = null; | ||
| 64 | } | ||
| 65 | |||
| 66 | /** | ||
| 67 | * Parses the ROW or COL attributes and returns | ||
| 68 | * an array of strings that represent the space | ||
| 69 | * distribution. | ||
| 70 | * | ||
| 71 | */ | ||
| 72 | private String[] parseRowColSpec(HTML.Attribute key) { | ||
| 73 | |||
| 74 | AttributeSet attributes = getElement().getAttributes(); | ||
| 75 | String spec = "*"; | ||
| 76 | if (attributes != null) { | ||
| 77 | if (attributes.getAttribute(key) != null) { | ||
| 78 | spec = (String)attributes.getAttribute(key); | ||
| 79 | } | ||
| 80 | } | ||
| 81 | |||
| 82 | StringTokenizer tokenizer = new StringTokenizer(spec, ","); | ||
| 83 | int nTokens = tokenizer.countTokens(); | ||
| 84 | int n = getViewCount(); | ||
| 85 | String[] items = new String[Math.max(nTokens, n)]; | ||
| 86 | int i = 0; | ||
| 87 | for (; i < nTokens; i++) { | ||
| 88 | items[i] = tokenizer.nextToken().trim(); | ||
| 89 | // As per the spec, 100% is the same as * | ||
| 90 | // hence the mapping. | ||
| 91 | // | ||
| 92 | if (items[i].equals("100%")) { | ||
| 93 | items[i] = "*"; | ||
| 94 | } | ||
| 95 | } | ||
| 96 | // extend spec if we have more children than specified | ||
| 97 | // in ROWS or COLS attribute | ||
| 98 | for (; i < items.length; i++) { | ||
| 99 | items[i] = "*"; | ||
| 100 | } | ||
| 101 | return items; | ||
| 102 | } | ||
| 103 | |||
| 104 | |||
| 105 | /** | ||
| 106 | * Initializes a number of internal state variables | ||
| 107 | * that store information about space allocation | ||
| 108 | * for the frames contained within the frameset. | ||
| 109 | */ | ||
| 110 | private void init() { | ||
| 111 | if (getAxis() == View.Y_AXIS) { | ||
| 112 | children = parseRowColSpec(HTML.Attribute.ROWS); | ||
| 113 | } else { | ||
| 114 | children = parseRowColSpec(HTML.Attribute.COLS); | ||
| 115 | } | ||
| 116 | percentChildren = new int[children.length]; | ||
| 117 | relativeChildren = new int[children.length]; | ||
| 118 | absoluteChildren = new int[children.length]; | ||
| 119 | |||
| 120 | for (int i = 0; i < children.length; i++) { | ||
| 121 | percentChildren[i] = -1; | ||
| 122 | relativeChildren[i] = -1; | ||
| 123 | absoluteChildren[i] = -1; | ||
| 124 | |||
| 125 | if (children[i].endsWith("*")) { | ||
| 126 | if (children[i].length() > 1) { | ||
| 127 | relativeChildren[i] = | ||
| 128 | Integer.parseInt(children[i].substring( | ||
| 129 | 0, children[i].length()-1)); | ||
| 130 | relativeTotals += relativeChildren[i]; | ||
| 131 | } else { | ||
| 132 | relativeChildren[i] = 1; | ||
| 133 | relativeTotals += 1; | ||
| 134 | } | ||
| 135 | } else if (children[i].indexOf('%') != -1) { | ||
| 136 | percentChildren[i] = parseDigits(children[i]); | ||
| 137 | percentTotals += percentChildren[i]; | ||
| 138 | } else { | ||
| 139 | absoluteChildren[i] = Integer.parseInt(children[i]); | ||
| 140 | } | ||
| 141 | } | ||
| 142 | if (percentTotals > 100) { | ||
| 143 | for (int i = 0; i < percentChildren.length; i++) { | ||
| 144 | if (percentChildren[i] > 0) { | ||
| 145 | percentChildren[i] = | ||
| 146 | (percentChildren[i] * 100) / percentTotals; | ||
| 147 | } | ||
| 148 | } | ||
| 149 | percentTotals = 100; | ||
| 150 | } | ||
| 151 | } | ||
| 152 | |||
| 153 | /** | ||
| 154 | * Perform layout for the major axis of the box (i.e. the | ||
| 155 | * axis that it represents). The results of the layout should | ||
| 156 | * be placed in the given arrays which represent the allocations | ||
| 157 | * to the children along the major axis. | ||
| 158 | * | ||
| 159 | * @param targetSpan the total span given to the view, which | ||
| 160 | * whould be used to layout the children | ||
| 161 | * @param axis the axis being layed out | ||
| 162 | * @param offsets the offsets from the origin of the view for | ||
| 163 | * each of the child views; this is a return value and is | ||
| 164 | * filled in by the implementation of this method | ||
| 165 | * @param spans the span of each child view; this is a return | ||
| 166 | * value and is filled in by the implementation of this method | ||
| 167 | * @return the offset and span for each child view in the | ||
| 168 | * offsets and spans parameters | ||
| 169 | */ | ||
| 170 | protected void layoutMajorAxis(int targetSpan, int axis, int[] offsets, | ||
| 171 | int[] spans) { | ||
| 172 | if (children == null) { | ||
| 173 | init(); | ||
| 174 | } | ||
| 175 | SizeRequirements.calculateTiledPositions(targetSpan, null, | ||
| 176 | getChildRequests(targetSpan, | ||
| 177 | axis), | ||
| 178 | offsets, spans); | ||
| 179 | } | ||
| 180 | |||
| 181 | protected SizeRequirements[] getChildRequests(int targetSpan, int axis) { | ||
| 182 | |||
| 183 | int span[] = new int[children.length]; | ||
| 184 | |||
| 185 | spread(targetSpan, span); | ||
| 186 | int n = getViewCount(); | ||
| 187 | SizeRequirements[] reqs = new SizeRequirements[n]; | ||
| 188 | for (int i = 0, sIndex = 0; i < n; i++) { | ||
| 189 | View v = getView(i); | ||
| 190 | if ((v instanceof FrameView) || (v instanceof FrameSetView)) { | ||
| 191 | reqs[i] = new SizeRequirements((int) v.getMinimumSpan(axis), | ||
| 192 | span[sIndex], | ||
| 193 | (int) v.getMaximumSpan(axis), | ||
| 194 | 0.5f); | ||
| 195 | sIndex++; | ||
| 196 | } else { | ||
| 197 | int min = (int) v.getMinimumSpan(axis); | ||
| 198 | int pref = (int) v.getPreferredSpan(axis); | ||
| 199 | int max = (int) v.getMaximumSpan(axis); | ||
| 200 | float a = v.getAlignment(axis); | ||
| 201 | reqs[i] = new SizeRequirements(min, pref, max, a); | ||
| 202 | } | ||
| 203 | } | ||
| 204 | return reqs; | ||
| 205 | } | ||
| 206 | |||
| 207 | |||
| 208 | /** | ||
| 209 | * This method is responsible for returning in span[] the | ||
| 210 | * span for each child view along the major axis. it | ||
| 211 | * computes this based on the information that extracted | ||
| 212 | * from the value of the ROW/COL attribute. | ||
| 213 | */ | ||
| 214 | private void spread(int targetSpan, int span[]) { | ||
| 215 | |||
| 216 | if (targetSpan == 0) { | ||
| 217 | return; | ||
| 218 | } | ||
| 219 | |||
| 220 | int tempSpace = 0; | ||
| 221 | int remainingSpace = targetSpan; | ||
| 222 | |||
| 223 | // allocate the absolute's first, they have | ||
| 224 | // precedence | ||
| 225 | // | ||
| 226 | for (int i = 0; i < span.length; i++) { | ||
| 227 | if (absoluteChildren[i] > 0) { | ||
| 228 | span[i] = absoluteChildren[i]; | ||
| 229 | remainingSpace -= span[i]; | ||
| 230 | } | ||
| 231 | } | ||
| 232 | |||
| 233 | // then deal with percents. | ||
| 234 | // | ||
| 235 | tempSpace = remainingSpace; | ||
| 236 | for (int i = 0; i < span.length; i++) { | ||
| 237 | if (percentChildren[i] > 0 && tempSpace > 0) { | ||
| 238 | span[i] = (percentChildren[i] * tempSpace) / 100; | ||
| 239 | remainingSpace -= span[i]; | ||
| 240 | } else if (percentChildren[i] > 0 && tempSpace <= 0) { | ||
| 241 | span[i] = targetSpan / span.length; | ||
| 242 | remainingSpace -= span[i]; | ||
| 243 | } | ||
| 244 | } | ||
| 245 | |||
| 246 | // allocate remainingSpace to relative | ||
| 247 | if (remainingSpace > 0 && relativeTotals > 0) { | ||
| 248 | for (int i = 0; i < span.length; i++) { | ||
| 249 | if (relativeChildren[i] > 0) { | ||
| 250 | span[i] = (remainingSpace * | ||
| 251 | relativeChildren[i]) / relativeTotals; | ||
| 252 | } | ||
| 253 | } | ||
| 254 | } else if (remainingSpace > 0) { | ||
| 255 | // There are no relative columns and the space has been | ||
| 256 | // under- or overallocated. In this case, turn all the | ||
| 257 | // percentage and pixel specified columns to percentage | ||
| 258 | // columns based on the ratio of their pixel count to the | ||
| 259 | // total "virtual" size. (In the case of percentage columns, | ||
| 260 | // the pixel count would equal the specified percentage | ||
| 261 | // of the screen size. | ||
| 262 | |||
| 263 | // This action is in accordance with the HTML | ||
| 264 | // 4.0 spec (see section 8.3, the end of the discussion of | ||
| 265 | // the FRAMESET tag). The precedence of percentage and pixel | ||
| 266 | // specified columns is unclear (spec seems to indicate that | ||
| 267 | // they share priority, however, unspecified what happens when | ||
| 268 | // overallocation occurs.) | ||
| 269 | |||
| 270 | // addendum is that we behave similiar to netscape in that specified | ||
| 271 | // widths have precedance over percentage widths... | ||
| 272 | |||
| 273 | float vTotal = (float)(targetSpan - remainingSpace); | ||
| 274 | float[] tempPercents = new float[span.length]; | ||
| 275 | remainingSpace = targetSpan; | ||
| 276 | for (int i = 0; i < span.length; i++) { | ||
| 277 | // ok we know what our total space is, and we know how large each | ||
| 278 | // column should be relative to each other... therefore we can use | ||
| 279 | // that relative information to deduce their percentages of a whole | ||
| 280 | // and then scale them appropriately for the correct size | ||
| 281 | tempPercents[i] = ((float)span[i] / vTotal) * 100.00f; | ||
| 282 | span[i] = (int) ( ((float)targetSpan * tempPercents[i]) / 100.00f); | ||
| 283 | remainingSpace -= span[i]; | ||
| 284 | } | ||
| 285 | |||
| 286 | |||
| 287 | // this is for just in case there is something left over.. if there is we just | ||
| 288 | // add it one pixel at a time to the frames in order.. We shouldn't really ever get | ||
| 289 | // here and if we do it shouldn't be with more than 1 pixel, maybe two. | ||
| 290 | int i = 0; | ||
| 291 | while (remainingSpace != 0) { | ||
| 292 | if (remainingSpace < 0) { | ||
| 293 | span[i++]--; | ||
| 294 | remainingSpace++; | ||
| 295 | } | ||
| 296 | else { | ||
| 297 | span[i++]++; | ||
| 298 | remainingSpace--; | ||
| 299 | } | ||
| 300 | |||
| 301 | // just in case there are more pixels than frames...should never happen.. | ||
| 302 | if (i == span.length)i = 0; | ||
| 303 | } | ||
| 304 | } | ||
| 305 | } | ||
| 306 | |||
| 307 | /* | ||
| 308 | * Users have been known to type things like "%25" and "25 %". Deal | ||
| 309 | * with it. | ||
| 310 | */ | ||
| 311 | private int parseDigits(String mixedStr) { | ||
| 312 | int result = 0; | ||
| 313 | for (int i = 0; i < mixedStr.length(); i++) { | ||
| 314 | char ch = mixedStr.charAt(i); | ||
| 315 | if (Character.isDigit(ch)) { | ||
| 316 | result = (result * 10) + Character.digit(ch, 10); | ||
| 317 | } | ||
| 318 | } | ||
| 319 | return result; | ||
| 320 | } | ||
| 321 | |||
| 322 | } | ||