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1
15
16
17 package swingwt.awt.swtcustomlayout;
18
19 import org.eclipse.swt.widgets.*;
20 import org.eclipse.swt.graphics.Point;
21 import org.eclipse.swt.graphics.Rectangle;
22
23 public class SWTGridLayout extends Layout
24 {
25 private int _hgap;
26 private int _vgap;
27 private int _rows;
28 private int _columns;
29
30 public SWTGridLayout()
31 {
32 this(1, 0);
33 }
34
35 public SWTGridLayout(int rows, int columns)
36 {
37 this(rows, columns, 0, 0);
38 }
39
40 public SWTGridLayout(int rows, int columns, int hgap, int vgap)
41 {
42 if (rows == 0 && columns == 0)
43 throw new IllegalArgumentException  ("rows and cols cannot both be zero");
44 if (rows != 0)
45 setRows(rows);
46 setColumns(columns);
47 setHgap(hgap);
48 setVgap(vgap);
49 }
50
51 protected void layout(Composite target, boolean flushCache)
52 {
53 Rectangle r = target.getClientArea();
54 Control children[] = target.getChildren();
55 int ncomponents = children.length;
56 int nrows = getRows();
57 int ncols = getColumns();
58 if (ncomponents == 0)
59 return;
60 if (nrows > 0)
61 ncols = (ncomponents + nrows - 1) / nrows;
62 else
63 nrows = (ncomponents + ncols - 1) / ncols;
64 int w = r.width;
65 int h = r.height;
66 w = (w - (ncols - 1) * getHgap()) / ncols;
67 h = (h - (nrows - 1) * getVgap()) / nrows;
68 int col = 0;
69 int x = 0;
70 while (col < ncols)
71 {
72 int row = 0;
73 int y = 0;
74 while (row < nrows)
75 {
76 int i = row * ncols + col;
77 if (i < ncomponents)
78 children[i].setBounds(x, y, w, h);
79 row++;
80 y += h + getVgap();
81 }
82 col++;
83 x += w + getHgap();
84 }
85 }
86
87 protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache)
88 {
89 Control children[] = composite.getChildren();
90 int ncomponents = children.length;
91 int nrows = getRows();
92 int ncols = getColumns();
93 if (nrows > 0)
94 ncols = (ncomponents + nrows - 1) / nrows;
95 else
96 nrows = (ncomponents + ncols - 1) / ncols;
97 int w = 0;
98 int h = 0;
99 for (int i = 0; i < ncomponents; i++)
100 {
101 Control comp = children[i];
102 Point d = comp.computeSize(-1, -1);
103 if (w < d.x)
104 w = d.x;
105 if (h < d.y)
106 h = d.y;
107 }
108 return new Point(ncols * w + (ncols - 1) * getHgap(), nrows * h + (nrows - 1) * getVgap());
109 }
110
111 public String toString()
112 {
113 return "[" + paramString() + "]";
114 }
115
116 protected String paramString()
117 {
118 return getHgap() + ",vgap=" + getVgap() + ",rows=" + getRows() + ",cols=" + getColumns();
119 }
120
121 public int getRows()
122 {
123 return _rows;
124 }
125
126 public void setRows(int rows)
127 {
128 if (rows == 0 && getColumns() == 0)
129 throw new IllegalArgumentException ("rows and cols cannot both be zero");
130 _rows = rows;
131 }
132
133 public int getColumns()
134 {
135 return _columns;
136 }
137
138 public void setColumns(int columns)
139 {
140 if (columns == 0 && getRows() == 0)
141 throw new IllegalArgumentException ("rows and cols cannot both be zero");
142 _columns = columns;
143 }
144
145 public int getHgap()
146 {
147 return _hgap;
148 }
149
150 public void setHgap(int hgap)
151 {
152 _hgap = hgap;
153 }
154
155 public int getVgap()
156 {
157 return _vgap;
158 }
159
160 public void setVgap(int vgap)
161 {
162 _vgap = vgap;
163 }
164 }
165 |
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