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1 /*
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2 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions
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6 * are met:
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7 *
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8 * - Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 *
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11 * - Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 *
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15 * - Neither the name of Oracle or the names of its
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16 * contributors may be used to endorse or promote products derived
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17 * from this software without specific prior written permission.
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18 *
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19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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30 */
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31
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32 package javax.swing.layout;
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33
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34 import javax.swing.*;
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35 import javax.swing.SpringLayout;
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36 import java.awt.*;
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37
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38 /**
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39 * A 1.4 file that provides utility methods for
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40 * creating form- or grid-style layouts with SpringLayout.
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41 * These utilities are used by several programs, such as
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42 * SpringBox and SpringCompactGrid.
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43 */
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44 public class SpringUtilities {
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45 /**
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46 * A debugging utility that prints to stdout the component's
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47 * minimum, preferred, and maximum sizes.
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48 */
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49 public static void printSizes(Component c) {
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50 System.out.println("minimumSize = " + c.getMinimumSize());
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51 System.out.println("preferredSize = " + c.getPreferredSize());
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52 System.out.println("maximumSize = " + c.getMaximumSize());
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53 }
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54
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55 /**
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56 * Aligns the first <code>rows</code> * <code>cols</code>
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57 * components of <code>parent</code> in
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58 * a grid. Each component is as big as the maximum
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59 * preferred width and height of the components.
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60 * The parent is made just big enough to fit them all.
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61 *
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62 * @param rows number of rows
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63 * @param cols number of columns
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64 * @param initialX x location to start the grid at
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65 * @param initialY y location to start the grid at
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66 * @param xPad x padding between cells
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67 * @param yPad y padding between cells
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68 */
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69 public static void makeGrid(Container parent,
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70 int rows, int cols,
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71 int initialX, int initialY,
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72 int xPad, int yPad) {
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73 SpringLayout layout;
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74 try {
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75 layout = (SpringLayout)parent.getLayout();
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76 } catch (ClassCastException exc) {
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77 System.err.println("The first argument to makeGrid must use SpringLayout.");
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78 return;
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79 }
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80
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81 Spring xPadSpring = Spring.constant(xPad);
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82 Spring yPadSpring = Spring.constant(yPad);
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83 Spring initialXSpring = Spring.constant(initialX);
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84 Spring initialYSpring = Spring.constant(initialY);
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85 int max = rows * cols;
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86
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87 //Calculate Springs that are the max of the width/height so that all
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88 //cells have the same size.
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89 Spring maxWidthSpring = layout.getConstraints(parent.getComponent(0)).
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90 getWidth();
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91 Spring maxHeightSpring = layout.getConstraints(parent.getComponent(0)).
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92 getHeight();
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93 for (int i = 1; i < max; i++) {
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94 SpringLayout.Constraints cons = layout.getConstraints(
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95 parent.getComponent(i));
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96
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97 maxWidthSpring = Spring.max(maxWidthSpring, cons.getWidth());
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98 maxHeightSpring = Spring.max(maxHeightSpring, cons.getHeight());
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99 }
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100
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101 //Apply the new width/height Spring. This forces all the
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102 //components to have the same size.
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103 for (int i = 0; i < max; i++) {
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104 SpringLayout.Constraints cons = layout.getConstraints(
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105 parent.getComponent(i));
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106
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107 cons.setWidth(maxWidthSpring);
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108 cons.setHeight(maxHeightSpring);
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109 }
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110
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111 //Then adjust the x/y constraints of all the cells so that they
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112 //are aligned in a grid.
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113 SpringLayout.Constraints lastCons = null;
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114 SpringLayout.Constraints lastRowCons = null;
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115 for (int i = 0; i < max; i++) {
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116 SpringLayout.Constraints cons = layout.getConstraints(
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117 parent.getComponent(i));
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118 if (i % cols == 0) { //start of new row
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119 lastRowCons = lastCons;
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120 cons.setX(initialXSpring);
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121 } else { //x position depends on previous component
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122 cons.setX(Spring.sum(lastCons.getConstraint(SpringLayout.EAST),
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123 xPadSpring));
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124 }
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125
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126 if (i / cols == 0) { //first row
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127 cons.setY(initialYSpring);
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128 } else { //y position depends on previous row
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129 cons.setY(Spring.sum(lastRowCons.getConstraint(SpringLayout.SOUTH),
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130 yPadSpring));
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131 }
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132 lastCons = cons;
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133 }
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134
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135 //Set the parent's size.
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136 SpringLayout.Constraints pCons = layout.getConstraints(parent);
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137 pCons.setConstraint(SpringLayout.SOUTH,
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138 Spring.sum(
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139 Spring.constant(yPad),
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140 lastCons.getConstraint(SpringLayout.SOUTH)));
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141 pCons.setConstraint(SpringLayout.EAST,
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142 Spring.sum(
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143 Spring.constant(xPad),
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144 lastCons.getConstraint(SpringLayout.EAST)));
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145 }
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146
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147 /* Used by makeCompactGrid. */
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148 private static SpringLayout.Constraints getConstraintsForCell(
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149 int row, int col,
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150 Container parent,
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151 int cols) {
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152 SpringLayout layout = (SpringLayout) parent.getLayout();
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153 Component c = parent.getComponent(row * cols + col);
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154 return layout.getConstraints(c);
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155 }
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156
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157 /**
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158 * Aligns the first <code>rows</code> * <code>cols</code>
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159 * components of <code>parent</code> in
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160 * a grid. Each component in a column is as wide as the maximum
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161 * preferred width of the components in that column;
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162 * height is similarly determined for each row.
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163 * The parent is made just big enough to fit them all.
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164 *
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165 * @param rows number of rows
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166 * @param cols number of columns
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167 * @param initialX x location to start the grid at
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168 * @param initialY y location to start the grid at
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169 * @param xPad x padding between cells
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170 * @param yPad y padding between cells
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171 */
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172 public static void makeCompactGrid(Container parent,
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173 int rows, int cols,
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174 int initialX, int initialY,
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175 int xPad, int yPad) {
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176 SpringLayout layout;
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177 try {
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178 layout = (SpringLayout)parent.getLayout();
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179 } catch (ClassCastException exc) {
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180 System.err.println("The first argument to makeCompactGrid must use SpringLayout.");
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181 return;
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182 }
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183
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184 //Align all cells in each column and make them the same width.
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185 Spring x = Spring.constant(initialX);
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186 for (int c = 0; c < cols; c++) {
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187 Spring width = Spring.constant(0);
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188 for (int r = 0; r < rows; r++) {
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189 width = Spring.max(width,
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190 getConstraintsForCell(r, c, parent, cols).
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191 getWidth());
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192 }
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193 for (int r = 0; r < rows; r++) {
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194 SpringLayout.Constraints constraints =
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195 getConstraintsForCell(r, c, parent, cols);
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196 constraints.setX(x);
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197 constraints.setWidth(width);
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198 }
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199 x = Spring.sum(x, Spring.sum(width, Spring.constant(xPad)));
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200 }
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201
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202 //Align all cells in each row and make them the same height.
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203 Spring y = Spring.constant(initialY);
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204 for (int r = 0; r < rows; r++) {
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205 Spring height = Spring.constant(0);
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206 for (int c = 0; c < cols; c++) {
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207 height = Spring.max(height,
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208 getConstraintsForCell(r, c, parent, cols).
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209 getHeight());
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210 }
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211 for (int c = 0; c < cols; c++) {
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212 SpringLayout.Constraints constraints =
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213 getConstraintsForCell(r, c, parent, cols);
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214 constraints.setY(y);
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215 constraints.setHeight(height);
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216 }
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217 y = Spring.sum(y, Spring.sum(height, Spring.constant(yPad)));
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218 }
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219
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220 //Set the parent's size.
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221 SpringLayout.Constraints pCons = layout.getConstraints(parent);
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222 pCons.setConstraint(SpringLayout.SOUTH, y);
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223 pCons.setConstraint(SpringLayout.EAST, x);
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224 }
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225 }
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