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1
10
11 package swingwt.awt;
12
13
14 public class FlowLayout implements LayoutManager {
15
16 public static final int LEFT = 0;
17 public static final int CENTER = 1;
18 public static final int RIGHT = 2;
19 public static final int LEADING = 3;
20 public static final int TRAILING = 4;
21
22 int align;
23 int newAlign;
24 int hgap;
25 int vgap;
26
27 public FlowLayout() {
28 this(CENTER, 5, 5);
29 }
30
31 public FlowLayout(int align) {
32 this(align, 5, 5);
33 }
34
35 public FlowLayout(int align, int hgap, int vgap) {
36 this.hgap = hgap;
37 this.vgap = vgap;
38 setAlignment(align);
39 }
40
41 public int getAlignment() {
42 return newAlign;
43 }
44
45 public void setAlignment(int align) {
46 this.newAlign = align;
47
48 switch (align) {
49 case LEADING :
50 this.align = LEFT;
51 break;
52 case TRAILING :
53 this.align = RIGHT;
54 break;
55 default :
56 this.align = align;
57 break;
58 }
59 }
60
61 public int getHgap() {
62 return hgap;
63 }
64
65 public void setHgap(int hgap) {
66 this.hgap = hgap;
67 }
68
69 public int getVgap() {
70 return vgap;
71 }
72
73 public void setVgap(int vgap) {
74 this.vgap = vgap;
75 }
76
77 public void addLayoutComponent(String  name, Component comp) {
78 }
79
80 public void removeLayoutComponent(Component comp) {
81 }
82
83 public Dimension preferredLayoutSize(Container target) {
84 Dimension dim = new Dimension(0, 0);
85 int nmembers = target.getComponentCount();
86 boolean firstVisibleComponent = true;
87
88 for (int i = 0; i < nmembers; i++) {
89 Component m = target.getComponent(i);
90 if (m.isVisible()) {
91 Dimension d = m.getPreferredSize();
92 dim.height = Math.max(dim.height, d.height);
93 if (firstVisibleComponent) {
94 firstVisibleComponent = false;
95 } else {
96 dim.width += hgap;
97 }
98 dim.width += d.width;
99 }
100 }
101 Insets insets = target.getInsets();
102 dim.width += insets.left + insets.right + hgap * 2;
103 dim.height += insets.top + insets.bottom + vgap * 2;
104 return dim;
105 }
106
107 public Dimension minimumLayoutSize(Container target) {
108 Dimension dim = new Dimension(0, 0);
109 int nmembers = target.getComponentCount();
110
111 for (int i = 0; i < nmembers; i++) {
112 Component m = target.getComponent(i);
113 if (m.isVisible()) {
114 Dimension d = m.getMinimumSize();
115 dim.height = Math.max(dim.height, d.height);
116 if (i > 0) {
117 dim.width += hgap;
118 }
119 dim.width += d.width;
120 }
121 }
122 Insets insets = target.getInsets();
123 dim.width += insets.left + insets.right + hgap * 2;
124 dim.height += insets.top + insets.bottom + vgap * 2;
125 return dim;
126 }
127
128
129 public void layoutContainer(Container target) {
130 Insets insets = target.getInsets();
131 int maxwidth =
132 target.getWidth() - (insets.left + insets.right + hgap * 2);
133 int nmembers = target.getComponentCount();
134 int x = 0, y = insets.top + vgap;
135 int rowh = 0, start = 0;
136
137 boolean ltr = target.getComponentOrientation().isLeftToRight();
138
139 for (int i = 0; i < nmembers; i++) {
140 Component m = target.getComponent(i);
141 if (m.isVisible()) {
142 Dimension d = m.getPreferredSize();
143 m.setSize(d.width, d.height);
144
145 if ((x == 0) || ((x + d.width) <= maxwidth)) {
146 if (x > 0) {
147 x += hgap;
148 }
149 x += d.width;
150 rowh = Math.max(rowh, d.height);
151 } else {
152 setComponentPositions(target, insets.left + hgap, y, maxwidth - x, rowh, start, i, ltr);
153 x = d.width;
154 y += vgap + rowh;
155 rowh = d.height;
156 start = i;
157 }
158 }
159 }
160 setComponentPositions(target, insets.left + hgap, y, maxwidth - x, rowh, start, nmembers, ltr);
161 }
162
163 protected void setComponentPositions(
164 Container target,
165 int x,
166 int y,
167 int width,
168 int height,
169 int rowStart,
170 int rowEnd,
171 boolean ltr) {
172 switch (newAlign) {
173 case LEFT :
174 x += ltr ? 0 : width;
175 break;
176 case CENTER :
177 x += width / 2;
178 break;
179 case RIGHT :
180 x += ltr ? width : 0;
181 break;
182 case LEADING :
183 break;
184 case TRAILING :
185 x += width;
186 break;
187 }
188 for (int i = rowStart; i < rowEnd; i++) {
189 Component m = target.getComponent(i);
190 if (m.isVisible()) {
191 if (ltr) {
192 m.setBounds(x, y + (height - m.getPreferredSize().height) / 2, m.getPreferredSize().width, m.getPreferredSize().height);
193 } else {
194 m.setBounds(target.getWidth() - x - m.getPreferredSize().width, y + (height - m.getPreferredSize().height) / 2, m.getPreferredSize().width, m.getPreferredSize().height);
195 }
196 x += m.getPreferredSize().width + hgap;
197 }
198 }
199 }
200
201
202 }
203 |
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