1 package net.sf.jameleon.ui;
2
3 import javax.swing.*;
4 import java.awt.*;
5
6 /***
7 * A 1.4 file that provides utility methods for
8 * creating form- or grid-style layouts with SpringLayout.
9 * These utilities are used by several programs, such as
10 * SpringBox and SpringCompactGrid.
11 */
12 public class SpringUtilities {
13
14 /***
15 * don't instantiate this class
16 */
17 private SpringUtilities(){
18 }
19
20 /***
21 * A debugging utility that prints to stdout the component's
22 * minimum, preferred, and maximum sizes.
23 */
24 public static void printSizes(Component c) {
25 System.out.println("minimumSize = " + c.getMinimumSize());
26 System.out.println("preferredSize = " + c.getPreferredSize());
27 System.out.println("maximumSize = " + c.getMaximumSize());
28 }
29
30 /***
31 * Aligns the first <code>rows</code> * <code>cols</code>
32 * components of <code>parent</code> in
33 * a grid. Each component is as big as the maximum
34 * preferred width and height of the components.
35 * The parent is made just big enough to fit them all.
36 *
37 * @param rows number of rows
38 * @param cols number of columns
39 * @param initialX x location to start the grid at
40 * @param initialY y location to start the grid at
41 * @param xPad x padding between cells
42 * @param yPad y padding between cells
43 */
44 public static void makeGrid(Container parent,
45 int rows, int cols,
46 int initialX, int initialY,
47 int xPad, int yPad) {
48 SpringLayout layout;
49 try {
50 layout = (SpringLayout)parent.getLayout();
51 } catch (ClassCastException exc) {
52 System.err.println("The first argument to makeGrid must use SpringLayout.");
53 return;
54 }
55
56 Spring xPadSpring = Spring.constant(xPad);
57 Spring yPadSpring = Spring.constant(yPad);
58 Spring initialXSpring = Spring.constant(initialX);
59 Spring initialYSpring = Spring.constant(initialY);
60 int max = rows * cols;
61
62
63
64 Spring maxWidthSpring = layout.getConstraints(parent.getComponent(0)).
65 getWidth();
66 Spring maxHeightSpring = layout.getConstraints(parent.getComponent(0)).
67 getHeight();
68 for (int i = 1; i < max; i++) {
69 SpringLayout.Constraints cons = layout.getConstraints(
70 parent.getComponent(i));
71
72 maxWidthSpring = Spring.max(maxWidthSpring, cons.getWidth());
73 maxHeightSpring = Spring.max(maxHeightSpring, cons.getHeight());
74 }
75
76
77
78 for (int i = 0; i < max; i++) {
79 SpringLayout.Constraints cons = layout.getConstraints(
80 parent.getComponent(i));
81
82 cons.setWidth(maxWidthSpring);
83 cons.setHeight(maxHeightSpring);
84 }
85
86
87
88 SpringLayout.Constraints lastCons = null;
89 SpringLayout.Constraints lastRowCons = null;
90 for (int i = 0; i < max; i++) {
91 SpringLayout.Constraints cons = layout.getConstraints(
92 parent.getComponent(i));
93 if (i % cols == 0) {
94 lastRowCons = lastCons;
95 cons.setX(initialXSpring);
96 } else {
97 cons.setX(Spring.sum(lastCons.getConstraint(SpringLayout.EAST),
98 xPadSpring));
99 }
100
101 if (i / cols == 0) {
102 cons.setY(initialYSpring);
103 } else {
104 cons.setY(Spring.sum(lastRowCons.getConstraint(SpringLayout.SOUTH),
105 yPadSpring));
106 }
107 lastCons = cons;
108 }
109
110
111 SpringLayout.Constraints pCons = layout.getConstraints(parent);
112 pCons.setConstraint(SpringLayout.SOUTH,
113 Spring.sum(
114 Spring.constant(yPad),
115 lastCons.getConstraint(SpringLayout.SOUTH)));
116 pCons.setConstraint(SpringLayout.EAST,
117 Spring.sum(
118 Spring.constant(xPad),
119 lastCons.getConstraint(SpringLayout.EAST)));
120 }
121
122
123 private static SpringLayout.Constraints getConstraintsForCell(
124 int row, int col,
125 Container parent,
126 int cols) {
127 SpringLayout layout = (SpringLayout) parent.getLayout();
128 Component c = parent.getComponent(row * cols + col);
129 return layout.getConstraints(c);
130 }
131
132 /***
133 * Aligns the first <code>rows</code> * <code>cols</code>
134 * components of <code>parent</code> in
135 * a grid. Each component in a column is as wide as the maximum
136 * preferred width of the components in that column;
137 * height is similarly determined for each row.
138 * The parent is made just big enough to fit them all.
139 *
140 * @param rows number of rows
141 * @param cols number of columns
142 * @param initialX x location to start the grid at
143 * @param initialY y location to start the grid at
144 * @param xPad x padding between cells
145 * @param yPad y padding between cells
146 */
147 public static void makeCompactGrid(Container parent,
148 int rows, int cols,
149 int initialX, int initialY,
150 int xPad, int yPad) {
151 SpringLayout layout;
152 try {
153 layout = (SpringLayout)parent.getLayout();
154 } catch (ClassCastException exc) {
155 System.err.println("The first argument to makeCompactGrid must use SpringLayout.");
156 return;
157 }
158
159
160 Spring x = Spring.constant(initialX);
161 for (int c = 0; c < cols; c++) {
162 Spring width = Spring.constant(0);
163 for (int r = 0; r < rows; r++) {
164 width = Spring.max(width,
165 getConstraintsForCell(r, c, parent, cols).
166 getWidth());
167 }
168 for (int r = 0; r < rows; r++) {
169 SpringLayout.Constraints constraints =
170 getConstraintsForCell(r, c, parent, cols);
171 constraints.setX(x);
172 constraints.setWidth(width);
173 }
174 x = Spring.sum(x, Spring.sum(width, Spring.constant(xPad)));
175 }
176
177
178 Spring y = Spring.constant(initialY);
179 for (int r = 0; r < rows; r++) {
180 Spring height = Spring.constant(0);
181 for (int c = 0; c < cols; c++) {
182 height = Spring.max(height,
183 getConstraintsForCell(r, c, parent, cols).
184 getHeight());
185 }
186 for (int c = 0; c < cols; c++) {
187 SpringLayout.Constraints constraints =
188 getConstraintsForCell(r, c, parent, cols);
189 constraints.setY(y);
190 constraints.setHeight(height);
191 }
192 y = Spring.sum(y, Spring.sum(height, Spring.constant(yPad)));
193 }
194
195
196 SpringLayout.Constraints pCons = layout.getConstraints(parent);
197 pCons.setConstraint(SpringLayout.SOUTH, y);
198 pCons.setConstraint(SpringLayout.EAST, x);
199 }
200 }