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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 | +} | |