Source Code Cross Referenced for StatusBarLayout.java in  » Database-Client » executequery » org » underworldlabs » swing » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database Client » executequery » org.underworldlabs.swing 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * StatusBarLayout.java
003:         *
004:         * Copyright (C) 2002, 2003, 2004, 2005, 2006 Takis Diakoumis
005:         *
006:         * This program is free software; you can redistribute it and/or
007:         * modify it under the terms of the GNU General Public License
008:         * as published by the Free Software Foundation; either version 2
009:         * of the License, or any later version.
010:         *
011:         * This program is distributed in the hope that it will be useful,
012:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014:         * GNU General Public License for more details.
015:         *
016:         * You should have received a copy of the GNU General Public License
017:         * along with this program; if not, write to the Free Software
018:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
019:         *
020:         */
021:
022:        package org.underworldlabs.swing;
023:
024:        import java.awt.Component;
025:        import java.awt.Container;
026:        import java.awt.Dimension;
027:        import java.awt.Insets;
028:        import java.awt.LayoutManager2;
029:        import java.awt.Rectangle;
030:        import java.io.Serializable;
031:        import java.util.Collections;
032:        import java.util.Comparator;
033:        import java.util.Enumeration;
034:        import java.util.Hashtable;
035:        import java.util.Vector;
036:
037:        /* ----------------------------------------------------------
038:         * CVS NOTE: Changes to the CVS repository prior to the 
039:         *           release of version 3.0.0beta1 has meant a 
040:         *           resetting of CVS revision numbers.
041:         * ----------------------------------------------------------
042:         */
043:
044:        /**
045:         * Simple horizontal layout where components are effectively set
046:         * to a specified size and resized optionally to fill the width
047:         * of a status bar within a frame, panel etc.
048:         * Effective when some labels within a status bar are a fixed width 
049:         * and where others should fill the remaining space.
050:         *
051:         * @author   Takis Diakoumis
052:         * @version  $Revision: 1.4 $
053:         * @date     $Date: 2006/05/14 06:56:07 $
054:         */
055:        public class StatusBarLayout implements  LayoutManager2, Serializable {
056:
057:            /** the height of this status bar */
058:            private int height;
059:
060:            /** default layout height of 20px */
061:            public static final int DEFAULT_HEIGHT = 20;
062:
063:            /** The constraints/component pairs */
064:            private Hashtable<StatusBarLayoutConstraints, Component> componentsMap;
065:
066:            /** The tool bar constraints */
067:            private Vector<StatusBarLayoutConstraints> constraintsList;
068:
069:            /** the constraints comparator for ordering */
070:            private ConstraintsComparator comparator;
071:
072:            /** Creates a new instance of StatusBarLayout */
073:            public StatusBarLayout() {
074:                this (DEFAULT_HEIGHT);
075:            }
076:
077:            /** 
078:             * Creates a new instance of StatusBarLayout with
079:             * the specified height.
080:             * 
081:             * @param the height of the status bar
082:             */
083:            public StatusBarLayout(int height) {
084:                this .height = height;
085:                constraintsList = new Vector<StatusBarLayoutConstraints>();
086:                componentsMap = new Hashtable<StatusBarLayoutConstraints, Component>();
087:                comparator = new ConstraintsComparator();
088:            }
089:
090:            /**
091:             * Indicates that a child has changed its layout related information,
092:             * and thus any cached calculations should be flushed.
093:             * <p>
094:             * This method is called by AWT when the invalidate method is called
095:             * on the Container.  Since the invalidate method may be called 
096:             * asynchronously to the event thread, this method may be called
097:             * asynchronously.
098:             *
099:             * @param target  the affected container
100:             */
101:            public synchronized void invalidateLayout(Container target) {
102:            }
103:
104:            /**
105:             * Not used by this class.
106:             *
107:             * @param name the name of the component
108:             * @param comp the component
109:             */
110:            public void addLayoutComponent(String name, Component comp) {
111:            }
112:
113:            /**
114:             * Not used by this class.
115:             *
116:             * @param comp the component
117:             */
118:            public void removeLayoutComponent(Component comp) {
119:                if (componentsMap.containsValue(comp)) {
120:                    for (Enumeration i = componentsMap.keys(); i
121:                            .hasMoreElements();) {
122:                        Object object = i.nextElement();
123:                        if (componentsMap.get(object) == comp) {
124:                            componentsMap.remove(object);
125:                            constraintsList.remove(object);
126:                            break;
127:                        }
128:                    }
129:                }
130:            }
131:
132:            /**
133:             * Adds the specified component with the specified constraints
134:             * to the layout. Constraints must be an instance of 
135:             * <code>StatusBarLayoutConstraints</code>.
136:             *
137:             * @param comp the component
138:             * @param constraints constraints
139:             */
140:            public void addLayoutComponent(Component comp, Object constraints) {
141:                //StatusBarLayoutConstraints
142:                if (constraints instanceof  StatusBarLayoutConstraints) {
143:
144:                    StatusBarLayoutConstraints _constraints = (StatusBarLayoutConstraints) constraints;
145:
146:                    componentsMap.put(_constraints, comp);
147:                    constraintsList.add(_constraints);
148:
149:                } else if (constraints != null) {
150:                    throw new IllegalArgumentException(
151:                            "cannot add to layout: constraints must be a StatusBarLayoutConstraints");
152:                }
153:
154:            }
155:
156:            /**
157:             * Returns the preferred dimensions for this layout, given the components
158:             * in the specified target container.
159:             *
160:             * @param target  the container that needs to be laid out
161:             * @return the dimension
162:             */
163:            public Dimension preferredLayoutSize(Container target) {
164:                // parent container size
165:                Dimension targetDim = target.getSize();
166:
167:                // calculate component layout positions
168:                int _width = 0;
169:                int _height = height;
170:
171:                Rectangle[] rects = computePositions(target);
172:                for (int i = 0; i < rects.length; i++) {
173:                    _width += rects[i].width;
174:                }
175:
176:                Insets insets = target.getInsets();
177:                _width += (insets.left + insets.right);
178:                _height += (insets.top + insets.bottom);// + 1;
179:
180:                return new Dimension(_width, _height);
181:            }
182:
183:            /**
184:             * Returns the minimum dimensions needed to lay out the components
185:             * contained in the specified target container.
186:             *
187:             * @param target  the container that needs to be laid out 
188:             * @return the dimension
189:             */
190:            public Dimension minimumLayoutSize(Container target) {
191:                //return preferredLayoutSize(target);
192:                int _height = height;
193:                Insets insets = target.getInsets();
194:                _height += (insets.top + insets.bottom);
195:                return new Dimension(1, _height);
196:            }
197:
198:            /**
199:             * Returns the maximum dimensions the target container can use
200:             * to lay out the components it contains.
201:             *
202:             * @param target  the container that needs to be laid out 
203:             * @return the dimenion
204:             */
205:            public Dimension maximumLayoutSize(Container target) {
206:                return preferredLayoutSize(target);
207:            }
208:
209:            /**
210:             * Returns the alignment along the X axis for the container.
211:             * If the box is horizontal, the default
212:             * alignment will be returned. Otherwise, the alignment needed
213:             * to place the children along the X axis will be returned.
214:             *
215:             * @param target  the container
216:             * @return the alignment >= 0.0f && <= 1.0f
217:             */
218:            public synchronized float getLayoutAlignmentX(Container target) {
219:                return 0.5f;
220:            }
221:
222:            /**
223:             * Returns the alignment along the Y axis for the container.
224:             * If the box is vertical, the default
225:             * alignment will be returned. Otherwise, the alignment needed
226:             * to place the children along the Y axis will be returned.
227:             *
228:             * @param target  the container
229:             * @return the alignment >= 0.0f && <= 1.0f
230:             */
231:            public synchronized float getLayoutAlignmentY(Container target) {
232:                return 0.5f;
233:            }
234:
235:            /**
236:             * Called by the AWT <!-- XXX CHECK! --> when the specified container
237:             * needs to be laid out.
238:             *
239:             * @param target  the container to lay out
240:             *
241:             * @exception AWTError  if the target isn't the container specified to the
242:             *                      BoxLayout constructor
243:             */
244:            public void layoutContainer(Container target) {
245:
246:                // order the indexes
247:                Collections.sort(constraintsList, comparator);
248:
249:                // calculate component layout positions
250:                Rectangle[] rects = computePositions(target);
251:
252:                // flush changes to the container
253:                for (int i = 0; i < rects.length; i++) {
254:                    Component c = componentsMap.get(constraintsList.get(i));
255:                    c.setBounds(rects[i]);
256:                }
257:
258:            }
259:
260:            private Rectangle[] computePositions(Container target) {
261:                // parent container size
262:                Dimension targetDim = target.getSize();
263:
264:                // parent container insets
265:                Insets insets = target.getInsets();
266:
267:                int resizeCount = 0;
268:                int totalComponentWidth = 0;
269:                Rectangle[] rects = new Rectangle[constraintsList.size()];
270:
271:                for (int i = 0; i < rects.length; i++) {
272:                    StatusBarLayoutConstraints cons = constraintsList.get(i);
273:                    int preferredWidth = cons.getPreferredWidth();
274:                    boolean resizeToFit = cons.isResizeable();
275:
276:                    // will need to reset x values after all 
277:                    // widths have been calculated
278:
279:                    if (resizeToFit) {
280:                        resizeCount++;
281:                    }
282:                    rects[i] = new Rectangle(0, insets.top, preferredWidth,
283:                            height);
284:                    totalComponentWidth += preferredWidth;
285:                }
286:
287:                // resize components as required
288:                int fillWidth = 0;
289:                // let the resizable components fill the rest
290:                if (resizeCount > 0 && totalComponentWidth < targetDim.width) {
291:                    fillWidth = ((targetDim.width - insets.left - insets.right - totalComponentWidth) / resizeCount);// - 1;
292:                }
293:
294:                int xPosn = insets.left;
295:                for (int i = 0; i < rects.length; i++) {
296:                    Rectangle rect = rects[i];
297:                    rect.x = xPosn;
298:
299:                    StatusBarLayoutConstraints cons = constraintsList.get(i);
300:                    if (cons.isResizeable()) {
301:                        rect.width = cons.getPreferredWidth() + fillWidth;
302:                    }
303:
304:                    xPosn += rect.width;
305:                }
306:
307:                return rects;
308:            }
309:
310:            class ConstraintsComparator implements  Comparator {
311:
312:                /** <p>Compares the two objects. */
313:                public int compare(Object obj1, Object obj2) {
314:                    StatusBarLayoutConstraints cons1 = (StatusBarLayoutConstraints) obj1;
315:                    StatusBarLayoutConstraints cons2 = (StatusBarLayoutConstraints) obj2;
316:
317:                    int index1 = cons1.getIndex();
318:                    int index2 = cons2.getIndex();
319:
320:                    if (index1 < index2) {
321:                        return -1;
322:                    } else if (index1 > index2) {
323:                        return 1;
324:                    } else {
325:                        return 0;
326:                    }
327:                }
328:            }
329:
330:        }
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