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1
26
27 package swingwt.awt.swtcustomlayout;
28
29 import org.eclipse.swt.widgets.*;
30 import org.eclipse.swt.graphics.Point;
31 import org.eclipse.swt.graphics.Rectangle;
32
33 public class SWTFlowLayout extends Layout {
34
35 public static final int LEFT = 0;
36 public static final int CENTER = 1;
37 public static final int RIGHT = 2;
38 public static final int LEADING = 3;
39 public static final int TRAILING = 4;
40
41 private int _alignment;
42 private int _hgap;
43 private int _vgap;
44
45 public SWTFlowLayout()
46 {
47 this(1, 5, 5);
48 }
49
50 public SWTFlowLayout(int align)
51 {
52 this(align, 5, 5);
53 }
54
55 public SWTFlowLayout(int align, int hgap, int vgap)
56 {
57 setHgap(hgap);
58 setVgap(vgap);
59 setAlignment(align);
60 }
61
62 protected void layout(Composite target, boolean flushCache)
63 {
64 Rectangle r = target.getClientArea();
65 Control children[] = target.getChildren();
66 int maxwidth = r.width - getHgap() * 2;
67 int nmembers = children.length;
68 int x = 0;
69 int y = getVgap();
70 int rowh = 0;
71 int start = 0;
72 boolean ltr = true;
73 for (int i = 0; i < nmembers; i++)
74 {
75 Control m = children[i];
76 if (m.isVisible())
77 {
78 Point d;
81 if (m.getData("size") == null)
82 d = m.computeSize(-1, -1);
83 else {
84 swingwt.awt.Dimension dim = (swingwt.awt.Dimension) m.getData("size");
85 d = m.computeSize(dim.width, dim.height);
86 }
87
88 m.setBounds(new Rectangle(0, 0, d.x, d.y));
89
91 if (x == 0 || x + d.x <= maxwidth)
92 {
93 if (x > 0)
94 x += getHgap();
95 x += d.x;
96 rowh = Math.max(rowh, d.y);
97 }
98 else
99 {
100 moveComponents(target, r, getHgap(), y, maxwidth - x, rowh, start, i, ltr);
101 x = d.x;
102 y += getVgap() + rowh;
103 rowh = d.y;
104 start = i;
105 }
106 }
107 }
108 moveComponents(target, r, getHgap(), y, maxwidth - x, rowh, start, nmembers, ltr);
109 }
110
111 protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache)
112 {
113 Point size = new Point(0, 0);
114 Control children[] = composite.getChildren();
115 boolean firstVisibleComponent = true;
116 for (int i = 0; i < children.length; i++)
117 {
118 Control m = children[i];
119 if (m.isVisible())
120 {
121 Point d = m.computeSize(-1, -1);
122 size.y = Math.max(size.y, d.y);
123 if (firstVisibleComponent)
124 firstVisibleComponent = false;
125 else
126 size.x += getHgap();
127 size.x += d.x;
128 }
129 }
130 size.x += getHgap() * 2;
131 size.y += getVgap() * 2;
132 return size;
133 }
134
135 public int getAlignment()
136 {
137 return _alignment;
138 }
139
140 public void setAlignment(int align)
141 {
142 _alignment = align;
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 private void moveComponents(Composite target, Rectangle r, int x, int y, int width, int height, int rowStart, int rowEnd, boolean ltr)
166 {
167 switch (getAlignment())
168 {
169 case 0:
170 x += ltr ? 0 : width;
171 break;
172
173 case 1:
174 x += width / 2;
175 break;
176
177 case 2:
178 x += ltr ? width : 0;
179 break;
180
181 case 4:
182 x += width;
183 break;
184 }
185 Control children[] = target.getChildren();
186 for (int i = rowStart; i < rowEnd; i++)
187 {
188 Control m = children[i];
189 Point size = m.getSize();
190
191 if (m.isVisible())
192 {
193 if (ltr)
194 m.setLocation(x, y + (height - size.y) / 2);
195 else
196 m.setLocation(r.width - x - size.x, y + (height - size.y) / 2);
197 x += size.x + getHgap();
198 }
199 }
200 }
201
202 public String  toString()
203 {
204 return "[" + paramString() + "]";
205 }
206
207 protected String paramString()
208 {
209 String str;
210 str = "";
211 switch (getAlignment())
212 {
213 case 0:
214 str = ",align=left";
215 break;
216
217 case 1:
218 str = ",align=center";
219 break;
220
221 case 2:
222 str = ",align=right";
223 break;
224
225 case 3:
226 str = ",align=leading";
227 break;
228
229 case 4:
230 str = ",align=trailing";
231 break;
232 }
233 return getHgap() + ",vgap=" + getVgap() + str;
234 }
235 }
236 |
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