Source Code Cross Referenced for SMMDisplayController.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » main » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.midp.main 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:        package com.sun.midp.main;
027:
028:        import java.util.*;
029:
030:        /**
031:         * This class controls which MIDlet's display is in the foreground.
032:         * Running only in the AMS Isolate (0) the controller consulted by the MIDlet
033:         * proxy list for any foreground when various state changes occur in a MIDlet.
034:         * The display controller automatically selects the next foreground if
035:         * needed.
036:         * <p>
037:         * From the user perspective when the last MIDlet the user launched is created,
038:         * that MIDlet should automatically get the foreground (see the midletCreated
039:         * and foregroundRequest methods).
040:         * <p>
041:         * A MIDlet that is paused or destroyed is treated as if it has requested the
042:         * background as described above.
043:         */
044:        public class SMMDisplayController extends DisplayController {
045:            /** Suite ID of the last MIDlet in foreground. */
046:            private int lastMidletSuiteId;
047:
048:            /** Class name of the last MIDlet in foreground. */
049:            private String lastMidletClassName;
050:
051:            /** This MIDlet should only get the foreground if it is the last MIDlet. */
052:            private MIDletProxy lastMidletInForeground;
053:
054:            /**
055:             * Construct a DisplayController with a reference to the ProxyList.
056:             *
057:             * @param theMIDletProxyList reference to the MIDlet proxy list
058:             * @param suiteId the suiteId of the last MIDlet in the foreground
059:             * @param classname classname of the last MIDlet in the foreground
060:             */
061:            public SMMDisplayController(MIDletProxyList theMIDletProxyList,
062:                    int suiteId, String classname) {
063:                super (theMIDletProxyList);
064:                midletProxyList = theMIDletProxyList;
065:                lastMidletSuiteId = suiteId;
066:                lastMidletClassName = classname;
067:            }
068:
069:            /**
070:             * Handles MIDlet background requests.
071:             * <p>
072:             * If the MIDlet requesting to be put in the background is the foreground
073:             * MIDlet, then find a MIDlet to bring to the foreground (see the
074:             * findNextForeground method).
075:             *
076:             * @param midlet The proxy of the MIDlet that was updated
077:             *
078:             * @return Proxy of the next foreground MIDlet, may be the foreground
079:             *         MIDlet if the foreground should not change
080:             */
081:            MIDletProxy backgroundRequest(MIDletProxy midlet) {
082:                MIDletProxy foreground = midletProxyList.getForegroundMIDlet();
083:
084:                if (midlet != foreground) {
085:                    // not in the foreground, so don't change the foreground
086:                    return foreground;
087:                }
088:
089:                return findNextForegroundMIDlet();
090:            }
091:
092:            /**
093:             * Find a MIDlet that wants the foreground. If none wants the foreground
094:             * then find one that is not paused, if no find one that is paused
095:             * and wants the foreground, then find one that is paused. Only return the
096:             * "last MIDlet to have the foreground" if there are not other MIDlets.
097:             *
098:             * @return new foreground task or null
099:             */
100:            private MIDletProxy findNextForegroundMIDlet() {
101:                Enumeration midlets;
102:
103:                // find the first task that is active and wants foreground
104:                midlets = midletProxyList.getMIDlets();
105:                while (midlets.hasMoreElements()) {
106:                    MIDletProxy current = (MIDletProxy) midlets.nextElement();
107:
108:                    if (current.getMidletState() != MIDletProxy.MIDLET_ACTIVE) {
109:                        continue;
110:                    }
111:
112:                    if (current.wantsForeground()
113:                            && current != getLastMidletInForeground()) {
114:                        return current;
115:                    }
116:                }
117:
118:                // find the first task that is active
119:                midlets = midletProxyList.getMIDlets();
120:                while (midlets.hasMoreElements()) {
121:                    MIDletProxy current = (MIDletProxy) midlets.nextElement();
122:
123:                    if (current.getMidletState() != MIDletProxy.MIDLET_ACTIVE
124:                            && current != getLastMidletInForeground()) {
125:                        return current;
126:                    }
127:                }
128:
129:                // find the first task that is paused and wants the foreground
130:                midlets = midletProxyList.getMIDlets();
131:                while (midlets.hasMoreElements()) {
132:                    MIDletProxy current = (MIDletProxy) midlets.nextElement();
133:
134:                    if (current.getMidletState() != MIDletProxy.MIDLET_PAUSED
135:                            && current != getLastMidletInForeground()) {
136:                        continue;
137:                    }
138:
139:                    if (current.wantsForeground()
140:                            && current != getLastMidletInForeground()) {
141:                        return current;
142:                    }
143:                }
144:
145:                // find the first task that is paused
146:                midlets = midletProxyList.getMIDlets();
147:                while (midlets.hasMoreElements()) {
148:                    MIDletProxy current = (MIDletProxy) midlets.nextElement();
149:
150:                    if (current.getMidletState() != MIDletProxy.MIDLET_PAUSED
151:                            && current != getLastMidletInForeground()) {
152:                        return current;
153:                    }
154:                }
155:
156:                return getLastMidletInForeground();
157:            }
158:
159:            /**
160:             * Returns the last MIDlet to that should get the foreground.
161:             *
162:             * @return last MIDlet in foreground
163:             */
164:            private MIDletProxy getLastMidletInForeground() {
165:                if (lastMidletInForeground == null) {
166:                    lastMidletInForeground = midletProxyList.findMIDletProxy(
167:                            lastMidletSuiteId, lastMidletClassName);
168:                }
169:
170:                return lastMidletInForeground;
171:            }
172:        }
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