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| 1 | +/* | |
| 2 | + * Copyright (c) 1995, 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 | + | |
| 26 | +package sun.awt; | |
| 27 | + | |
| 28 | +import java.awt.*; | |
| 29 | +import java.util.BitSet; | |
| 30 | + | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * A layout manager for a container that lays out grids. Allows setting | |
| 34 | + * the relative sizes of rows and columns. | |
| 35 | + * | |
| 36 | + * @author Herb Jellinek | |
| 37 | + */ | |
| 38 | + | |
| 39 | + | |
| 40 | +public class VariableGridLayout extends GridLayout { | |
| 41 | + | |
| 42 | + BitSet rowsSet = new BitSet(); | |
| 43 | + double rowFractions[] = null; | |
| 44 | + | |
| 45 | + BitSet colsSet = new BitSet(); | |
| 46 | + double colFractions[] = null; | |
| 47 | + | |
| 48 | + int rows; | |
| 49 | + int cols; | |
| 50 | + int hgap; | |
| 51 | + int vgap; | |
| 52 | + | |
| 53 | + /** | |
| 54 | + * Creates a grid layout with the specified rows and specified columns. | |
| 55 | + * @param rows the rows | |
| 56 | + * @param cols the columns | |
| 57 | + */ | |
| 58 | + public VariableGridLayout(int rows, int cols) { | |
| 59 | + this(rows, cols, 0, 0); | |
| 60 | + | |
| 61 | + if (rows != 0) { | |
| 62 | + rowsSet = new BitSet(rows); | |
| 63 | + stdRowFractions(rows); | |
| 64 | + } | |
| 65 | + | |
| 66 | + if (cols != 0) { | |
| 67 | + colsSet = new BitSet(cols); | |
| 68 | + stdColFractions(cols); | |
| 69 | + } | |
| 70 | + } | |
| 71 | + | |
| 72 | + /** | |
| 73 | + * Creates a grid layout with the specified rows, columns, | |
| 74 | + * horizontal gap, and vertical gap. | |
| 75 | + * @param rows the rows | |
| 76 | + * @param cols the columns | |
| 77 | + * @param hgap the horizontal gap variable | |
| 78 | + * @param vgap the vertical gap variable | |
| 79 | + * @exception IllegalArgumentException If the rows and columns are invalid. | |
| 80 | + */ | |
| 81 | + public VariableGridLayout(int rows, int cols, int hgap, int vgap) { | |
| 82 | + super(rows, cols, hgap, vgap); | |
| 83 | + | |
| 84 | + this.rows = rows; | |
| 85 | + this.cols = cols; | |
| 86 | + this.hgap = hgap; | |
| 87 | + this.vgap = vgap; | |
| 88 | + | |
| 89 | + if (rows != 0) { | |
| 90 | + rowsSet = new BitSet(rows); | |
| 91 | + stdRowFractions(rows); | |
| 92 | + } | |
| 93 | + | |
| 94 | + if (cols != 0) { | |
| 95 | + colsSet = new BitSet(cols); | |
| 96 | + stdColFractions(cols); | |
| 97 | + } | |
| 98 | + } | |
| 99 | + | |
| 100 | + void stdRowFractions(int nrows) { | |
| 101 | + rowFractions = new double[nrows]; | |
| 102 | + for (int i = 0; i < nrows; i++) { | |
| 103 | + rowFractions[i] = 1.0 / nrows; | |
| 104 | + } | |
| 105 | + } | |
| 106 | + | |
| 107 | + void stdColFractions(int ncols) { | |
| 108 | + colFractions = new double[ncols]; | |
| 109 | + for (int i = 0; i < ncols; i++) { | |
| 110 | + colFractions[i] = 1.0 / ncols; | |
| 111 | + } | |
| 112 | + } | |
| 113 | + | |
| 114 | + public void setRowFraction(int rowNum, double fraction) { | |
| 115 | + rowsSet.set(rowNum); | |
| 116 | + rowFractions[rowNum] = fraction; | |
| 117 | + } | |
| 118 | + | |
| 119 | + public void setColFraction(int colNum, double fraction) { | |
| 120 | + colsSet.set(colNum); | |
| 121 | + colFractions[colNum] = fraction; | |
| 122 | + } | |
| 123 | + | |
| 124 | + public double getRowFraction(int rowNum) { | |
| 125 | + return rowFractions[rowNum]; | |
| 126 | + } | |
| 127 | + | |
| 128 | + public double getColFraction(int colNum) { | |
| 129 | + return colFractions[colNum]; | |
| 130 | + } | |
| 131 | + | |
| 132 | + void allocateExtraSpace(double vec[], BitSet userSet) { | |
| 133 | + // collect the space that's been explicitly allocated... | |
| 134 | + double total = 0.0; | |
| 135 | + int unallocated = 0; | |
| 136 | + int i; | |
| 137 | + for (i = 0; i < vec.length; i++) { | |
| 138 | + if (userSet.get(i)) { | |
| 139 | + total += vec[i]; | |
| 140 | + } else { | |
| 141 | + unallocated++; | |
| 142 | + } | |
| 143 | + } | |
| 144 | + | |
| 145 | + // ... then spread the extra space | |
| 146 | + if (unallocated != 0) { | |
| 147 | + double space = (1.0 - total) / unallocated; | |
| 148 | + for (i = 0; i < vec.length; i++) { | |
| 149 | + if (!userSet.get(i)) { | |
| 150 | + vec[i] = space; | |
| 151 | + userSet.set(i); | |
| 152 | + } | |
| 153 | + } | |
| 154 | + } | |
| 155 | + } | |
| 156 | + | |
| 157 | + | |
| 158 | + void allocateExtraSpace() { | |
| 159 | + allocateExtraSpace(rowFractions, rowsSet); | |
| 160 | + allocateExtraSpace(colFractions, colsSet); | |
| 161 | + } | |
| 162 | + | |
| 163 | + /** | |
| 164 | + * Lays out the container in the specified panel. | |
| 165 | + * @param parent the specified component being laid out | |
| 166 | + * @see Container | |
| 167 | + */ | |
| 168 | + public void layoutContainer(Container parent) { | |
| 169 | + Insets insets = parent.insets(); | |
| 170 | + int ncomponents = parent.countComponents(); | |
| 171 | + int nrows = rows; | |
| 172 | + int ncols = cols; | |
| 173 | + | |
| 174 | + if (nrows > 0) { | |
| 175 | + ncols = (ncomponents + nrows - 1) / nrows; | |
| 176 | + } else { | |
| 177 | + nrows = (ncomponents + ncols - 1) / ncols; | |
| 178 | + } | |
| 179 | + | |
| 180 | + if (rows == 0) { | |
| 181 | + stdRowFractions(nrows); | |
| 182 | + } | |
| 183 | + if (cols == 0) { | |
| 184 | + stdColFractions(ncols); | |
| 185 | + } | |
| 186 | + | |
| 187 | + Dimension size = parent.size(); | |
| 188 | + int w = size.width - (insets.left + insets.right); | |
| 189 | + int h = size.height - (insets.top + insets.bottom); | |
| 190 | + | |
| 191 | + w = (w - (ncols - 1) * hgap); | |
| 192 | + h = (h - (nrows - 1) * vgap); | |
| 193 | + | |
| 194 | + allocateExtraSpace(); | |
| 195 | + | |
| 196 | + for (int c = 0, x = insets.left ; c < ncols ; c++) { | |
| 197 | + int colWidth = (int)(getColFraction(c) * w); | |
| 198 | + for (int r = 0, y = insets.top ; r < nrows ; r++) { | |
| 199 | + int i = r * ncols + c; | |
| 200 | + int rowHeight = (int)(getRowFraction(r) * h); | |
| 201 | + | |
| 202 | + if (i < ncomponents) { | |
| 203 | + parent.getComponent(i).reshape(x, y, colWidth, rowHeight); | |
| 204 | + } | |
| 205 | + y += rowHeight + vgap; | |
| 206 | + } | |
| 207 | + x += colWidth + hgap; | |
| 208 | + } | |
| 209 | + } | |
| 210 | + | |
| 211 | + static String fracsToString(double array[]) { | |
| 212 | + String result = "["+array.length+"]"; | |
| 213 | + | |
| 214 | + for (int i = 0; i < array.length; i++) { | |
| 215 | + result += "<"+array[i]+">"; | |
| 216 | + } | |
| 217 | + return result; | |
| 218 | + } | |
| 219 | + | |
| 220 | + /** | |
| 221 | + * Returns the String representation of this VariableGridLayout's values. | |
| 222 | + */ | |
| 223 | + public String toString() { | |
| 224 | + return getClass().getName() + "[hgap=" + hgap + ",vgap=" + vgap + | |
| 225 | + ",rows=" + rows + ",cols=" + cols + | |
| 226 | + ",rowFracs=" + | |
| 227 | + fracsToString(rowFractions) + | |
| 228 | + ",colFracs=" + | |
| 229 | + fracsToString(colFractions) + "]"; | |
| 230 | + } | |
| 231 | +} | |