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1
25
26 package swingwt.awt;
27
28 import java.util.Vector  ;
29
30 public class CardLayout implements LayoutManager2 {
31
32 int currentCard = 0;
33 int hgap;
34 int vgap;
35
36 public CardLayout() {
37 this(0, 0);
38 }
39
40 public CardLayout(int hgap, int vgap) {
41 this.hgap = hgap;
42 this.vgap = vgap;
43 }
44
45 public int getHgap() {
46 return hgap;
47 }
48
49 public void setHgap(int hgap) {
50 this.hgap = hgap;
51 }
52
53 public int getVgap() {
54 return vgap;
55 }
56
57 public void setVgap(int vgap) {
58 this.vgap = vgap;
59 }
60
61 public void addLayoutComponent(Component comp, Object constraints) {
62 if (constraints instanceof String ) {
63 addLayoutComponent((String ) constraints, comp);
64 } else {
65 System.out.println(comp.toString());
66 }
67 }
68
69 public void addLayoutComponent(String name, Component comp) {
70 if (!cards.isEmpty()) {
71 comp.setVisible(false);
72 }
73 for (int i = 0; i < cards.size(); i++) {
74 if (((Card) cards.get(i)).name.equals(name)) {
75 ((Card) cards.get(i)).comp = comp;
76 return;
77 }
78 }
79 cards.add(new Card(name, comp));
80 }
81
82 public void removeLayoutComponent(Component comp) {
83 for (int i = 0; i < cards.size(); i++) {
84 if (((Card) cards.get(i)).comp == comp) {
85 if (comp.isVisible() && (comp.getParent() != null)) {
86 next(comp.getParent());
87 }
88
89 cards.remove(i);
90 if (currentCard > i) {
91 currentCard--;
92 }
93 break;
94 }
95 }
96 }
97
98 public Dimension preferredLayoutSize(Container parent) {
99 Insets insets = parent.getInsets();
100 int ncomponents = parent.getComponentCount();
101 int w = 0;
102 int h = 0;
103
104 for (int i = 0; i < ncomponents; i++) {
105 Component comp = parent.getComponent(i);
106 Dimension d = comp.getPreferredSize();
107 if (d.width > w) {
108 w = d.width;
109 }
110 if (d.height > h) {
111 h = d.height;
112 }
113 }
114 return new Dimension(
115 insets.left + insets.right + w + hgap * 2,
116 insets.top + insets.bottom + h + vgap * 2);
117 }
118
119 public Dimension minimumLayoutSize(Container parent) {
120 Insets insets = parent.getInsets();
121 int ncomponents = parent.getComponentCount();
122 int w = 0;
123 int h = 0;
124
125 for (int i = 0; i < ncomponents; i++) {
126 Component comp = parent.getComponent(i);
127 Dimension d = comp.getMinimumSize();
128 if (d.width > w) {
129 w = d.width;
130 }
131 if (d.height > h) {
132 h = d.height;
133 }
134 }
135 return new Dimension(
136 insets.left + insets.right + w + hgap * 2,
137 insets.top + insets.bottom + h + vgap * 2);
138 }
139
140 public Dimension maximumLayoutSize(Container target) {
141 return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
142 }
143
144 public float getLayoutAlignmentX(Container parent) {
145 return (float) 0.5;
146 }
147
148 public float getLayoutAlignmentY(Container parent) {
149 return (float) 0.5;
150 }
151
152 public void invalidateLayout(Container target) {
153 }
154
155 public void layoutContainer(Container parent) {
156 Insets insets = parent.getInsets();
157 int ncomponents = parent.getComponentCount();
158 Component comp = null;
159 boolean currentFound = false;
160
161 for (int i = 0; i < ncomponents; i++) {
162 comp = parent.getComponent(i);
163 comp.setBounds(
164 hgap + insets.left,
165 vgap + insets.top,
166 parent.getWidth() - (hgap * 2 + insets.left + insets.right),
167 parent.getHeight() - (vgap * 2 + insets.top + insets.bottom));
168 if (comp.isVisible()) {
169 currentFound = true;
170 }
171 }
172
173 if (!currentFound && ncomponents > 0) {
174 parent.getComponent(0).setVisible(true);
175 }
176 }
177
178 void checkLayout(Container parent) {
179 }
180
181 public void first(Container parent) {
182 int ncomponents = parent.getComponentCount();
183 for (int i = 0; i < ncomponents; i++) {
184 Component comp = parent.getComponent(i);
185 if (comp.isVisible()) {
186 comp.setVisible(false);
187 break;
188 }
189 }
190 if (ncomponents > 0) {
191 currentCard = 0;
192 parent.getComponent(0).setVisible(true);
193 parent.validate();
194 }
195 }
196
197 public void next(Container parent) {
198 int ncomponents = parent.getComponentCount();
199 for (int i = 0; i < ncomponents; i++) {
200 Component comp = parent.getComponent(i);
201 if (comp.isVisible()) {
202 comp.setVisible(false);
203 currentCard = (i + 1) % ncomponents;
204 comp = parent.getComponent(currentCard);
205 comp.setVisible(true);
206 parent.validate();
207 return;
208 }
209 }
210 showFirstAvailableComponent(parent);
211 }
212
213 public void previous(Container parent) {
214 int ncomponents = parent.getComponentCount();
215 for (int i = 0; i < ncomponents; i++) {
216 Component comp = parent.getComponent(i);
217 if (comp.isVisible()) {
218 comp.setVisible(false);
219 currentCard = ((i > 0) ? i - 1 : ncomponents - 1);
220 comp = parent.getComponent(currentCard);
221 comp.setVisible(true);
222 parent.validate();
223 return;
224 }
225 }
226 showFirstAvailableComponent(parent);
227 }
228
229 public void last(Container parent) {
230 int ncomponents = parent.getComponentCount();
231 for (int i = 0; i < ncomponents; i++) {
232 Component comp = parent.getComponent(i);
233 if (comp.isVisible()) {
234 comp.setVisible(false);
235 break;
236 }
237 }
238 if (ncomponents > 0) {
239 currentCard = ncomponents - 1;
240 parent.getComponent(currentCard).setVisible(true);
241 parent.validate();
242 }
243 }
244
245 public void show(Container parent, String name) {
246 Component next = null;
247 int ncomponents = cards.size();
248 for (int i = 0; i < ncomponents; i++) {
249 Card card = (Card) cards.get(i);
250 if (card.name.equals(name)) {
251 next = card.comp;
252 currentCard = i;
253 break;
254 }
255 }
256 if ((next != null) && !next.isVisible()) {
257 ncomponents = parent.getComponentCount();
258 for (int i = 0; i < ncomponents; i++) {
259 Component comp = parent.getComponent(i);
260 if (comp.isVisible()) {
261 comp.setVisible(false);
262 break;
263 }
264 }
265 next.setVisible(true);
266 parent.validate();
267 }
268 }
269
270
271
272 private void showFirstAvailableComponent(Container parent) {
273 if (parent.getComponentCount() > 0) {
274 currentCard = 0;
275 parent.getComponent(0).setVisible(true);
276 parent.validate();
277 }
278 }
279
280 Vector cards = new Vector ();
281
282 private class Card {
283 public String name;
284 public Component comp;
285 public Card(String cardName, Component cardComponent) {
286 name = cardName;
287 comp = cardComponent;
288 }
289 }
290
291 public String toString() {
292 return getClass().getName() + "[hgap=" + hgap + ",vgap=" + vgap + "]";
293 }
294 }
295 |
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