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1
22
23 package swingwt.awt;
24
25 public class GridLayout implements LayoutManager {
26
27 int hgap;
28 int vgap;
29 int rows;
30 int cols;
31
32 public GridLayout() {
33 this(1, 0, 0, 0);
34 }
35
36 public GridLayout(int rows, int cols) {
37 this(rows, cols, 0, 0);
38 }
39
40 public GridLayout(int rows, int cols, int hgap, int vgap) {
41 if ((rows == 0) && (cols == 0)) {
42 throw new IllegalArgumentException  ("zero size");
43 }
44 this.cols = cols;
45 this.rows = rows;
46 this.hgap = hgap;
47 this.vgap = vgap;
48 }
49
50 public int getRows() {
51 return rows;
52 }
53
54 public void setRows(int rows) {
55 if ((rows == 0) && (this.cols == 0)) {
56 throw new IllegalArgumentException ("zero size");
57 }
58 this.rows = rows;
59 }
60
61 public int getColumns() {
62 return cols;
63 }
64
65 public void setColumns(int cols) {
66 if ((cols == 0) && (this.rows == 0)) {
67 throw new IllegalArgumentException ("zero size");
68 }
69 this.cols = cols;
70 }
71
72 public int getHgap() {
73 return hgap;
74 }
75
76 public void setHgap(int hgap) {
77 this.hgap = hgap;
78 }
79
80 public int getVgap() {
81 return vgap;
82 }
83
84 public void setVgap(int vgap) {
85 this.vgap = vgap;
86 }
87
88 public void addLayoutComponent(String name, Component comp) {
89 }
90
91 public void removeLayoutComponent(Component comp) {
92 }
93
94 public Dimension preferredLayoutSize(Container parent) {
95 Insets insets = parent.getInsets();
96 int ncomponents = parent.getComponentCount();
97 int nrows = rows;
98 int ncols = cols;
99
100 if (nrows > 0) {
101 ncols = (ncomponents + nrows - 1) / nrows;
102 } else {
103 nrows = (ncomponents + ncols - 1) / ncols;
104 }
105 int w = 0;
106 int h = 0;
107 for (int i = 0; i < ncomponents; i++) {
108 Component comp = parent.getComponent(i);
109 Dimension d = comp.getPreferredSize();
110 if (w < d.width) {
111 w = d.width;
112 }
113 if (h < d.height) {
114 h = d.height;
115 }
116 }
117 Dimension d = new Dimension(
118 insets.left + insets.right + ncols * w + (ncols - 1) * hgap,
119 insets.top + insets.bottom + nrows * h + (nrows - 1) * vgap);
120 return d;
121 }
122
123 public Dimension minimumLayoutSize(Container parent) {
124 Insets insets = parent.getInsets();
125 int ncomponents = parent.getComponentCount();
126 int nrows = rows;
127 int ncols = cols;
128 if (nrows > 0) {
129 ncols = (ncomponents + nrows - 1) / nrows;
130 }
131 else {
132 nrows = (ncomponents + ncols - 1) / ncols;
133 }
134 int w = 0;
135 int h = 0;
136 for (int i = 0; i < ncomponents; i++) {
137 Component comp = parent.getComponent(i);
138 Dimension d = comp.getMinimumSize();
139 if (w < d.width) {
140 w = d.width;
141 }
142 if (h < d.height) {
143 h = d.height;
144 }
145 }
146 return new Dimension(
147 insets.left + insets.right + ncols * w + (ncols - 1) * hgap,
148 insets.top + insets.bottom + nrows * h + (nrows - 1) * vgap);
149 }
150
151 public void layoutContainer(Container parent) {
152 Insets insets = parent.getInsets();
153 int ncomponents = parent.getComponentCount();
154 int nrows = rows;
155 int ncols = cols;
156 boolean ltr = parent.getComponentOrientation().isLeftToRight();
157 if (ncomponents == 0) {
158 return;
159 }
160 if (nrows > 0) {
161 ncols = (ncomponents + nrows - 1) / nrows;
162 } else {
163 nrows = (ncomponents + ncols - 1) / ncols;
164 }
165 int w = parent.getWidth() - (insets.left + insets.right);
166 int h = parent.getHeight() - (insets.top + insets.bottom);
167 w = (w - (ncols - 1) * hgap) / ncols;
168 h = (h - (nrows - 1) * vgap) / nrows;
169 if (ltr) {
170 for (int c = 0, x = insets.left;
171 c < ncols;
172 c++, x += w + hgap) {
173 for (int r = 0, y = insets.top;
174 r < nrows;
175 r++, y += h + vgap) {
176 int i = r * ncols + c;
177 if (i < ncomponents) {
178 parent.getComponent(i).setBounds(x, y, w, h);
179 }
180 }
181 }
182 }
183 else {
184 for (int c = 0, x = parent.getWidth() - insets.right - w; c < ncols; c++, x -= w + hgap) {
185 for (int r = 0, y = insets.top; r < nrows; r++, y += h + vgap) {
186 int i = r * ncols + c;
187 if (i < ncomponents) {
188 parent.getComponent(i).setBounds(x, y, w, h);
189 }
190 }
191 }
192 }
193 }
194
195 }
196 |
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