Source Code Cross Referenced for Spacer.java in  » 6.0-JDK-Modules » j2me » javax » microedition » lcdui » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » javax.microedition.lcdui 
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:
027:        package javax.microedition.lcdui;
028:
029:        import java.lang.IllegalArgumentException;
030:
031:        /**
032:         * A blank, non-interactive item that has a settable minimum size.  The
033:         * minimum width is useful for allocating flexible amounts of space between
034:         * <code>Items</code> within the same row of a
035:         * <code>Form</code>.  The minimum height is useful for
036:         * enforcing a particular minimum height of a row.  The application can set 
037:         * the minimum width or height to any non-negative value.  The implementation 
038:         * may enforce implementation-defined maximum values for the minimum width and 
039:         * height.
040:         *
041:         * <p>The unlocked preferred width of a <code>Spacer</code> is the same as its
042:         * current minimum width.  Its unlocked preferred height is the same as its
043:         * current minimum height.</p>
044:         * 
045:         * <p>Since a <code>Spacer's</code> primary purpose is to position
046:         * other items, it is
047:         * restricted to be non-interactive, and the application is not allowed to add
048:         * <code>Commands</code> to a <code>Spacer</code>.  Since the
049:         * presence of a label on an <code>Item</code> may affect
050:         * layout in device-specific ways, the label of a
051:         * <code>Spacer</code> is restricted to
052:         * always be <code>null</code>, and the application is not allowed
053:         * to change it.</p>
054:         * 
055:         */
056:
057:        public class Spacer extends Item {
058:
059:            /**
060:             * Creates a new <code>Spacer</code> with the given minimum
061:             * size.  The <code>Spacer's</code> label
062:             * is <code>null</code>.
063:             * The minimum size must be zero or greater.
064:             * If <code>minWidth</code> is greater than the
065:             * implementation-defined maximum width, the maximum
066:             * width will be used instead.
067:             * If <code>minHeight</code> is greater than the
068:             * implementation-defined maximum height, the maximum
069:             * height will be used instead.
070:             *
071:             * @param minWidth the minimum width in pixels
072:             * @param minHeight the minimum height in pixels
073:             * @throws IllegalArgumentException if either <code>minWidth</code>
074:             * or <code>minHeight</code> is less than zero
075:             */
076:            public Spacer(int minWidth, int minHeight) {
077:                super (null);
078:
079:                if (minWidth < 0 || minHeight < 0) {
080:                    throw new IllegalArgumentException();
081:                }
082:
083:                synchronized (Display.LCDUILock) {
084:                    width = minWidth;
085:                    height = minHeight;
086:
087:                    itemLF = spacerLF = LFFactory.getFactory()
088:                            .getSpacerLF(this );
089:                }
090:            }
091:
092:            /**
093:             * Sets the minimum size for this spacer.  The
094:             * <code>Form</code> will not
095:             * be allowed to make the item smaller than this size.
096:             * The minimum size must be zero or greater.
097:             * If <code>minWidth</code> is greater than the
098:             * implementation-defined maximum width, the maximum
099:             * width will be used instead.
100:             * If <code>minHeight</code> is greater than the
101:             * implementation-defined maximum height, the maximum
102:             * height will be used instead.
103:             * 
104:             * @param minWidth the minimum width in pixels
105:             * @param minHeight the minimum height in pixels
106:             * @throws IllegalArgumentException if either <code>minWidth</code>
107:             * or <code>minHeight</code> is less than zero
108:             */
109:            public void setMinimumSize(int minWidth, int minHeight) {
110:                if (minWidth < 0 || minHeight < 0) {
111:                    throw new IllegalArgumentException();
112:                }
113:
114:                synchronized (Display.LCDUILock) {
115:                    width = minWidth;
116:                    height = minHeight;
117:
118:                    spacerLF.lSetMinimumSize(minWidth, minHeight);
119:                }
120:            }
121:
122:            /**
123:             * <code>Spacers</code> are restricted from having
124:             * <code>Commands</code>, so this method will always
125:             * throw <code>IllegalStateException</code> whenever it is called.
126:             *
127:             * @param cmd the <code>Command</code>
128:             *
129:             * @throws IllegalStateException always
130:             */
131:            public void addCommand(Command cmd) {
132:                throw new IllegalStateException();
133:            }
134:
135:            /**
136:             * Spacers are restricted from having <code>Commands</code>,
137:             * so this method will always
138:             * throw <code>IllegalStateException</code> whenever it is called.
139:             *
140:             * @param cmd the <code>Command</code>
141:             *
142:             * @throws IllegalStateException always
143:             */
144:            public void setDefaultCommand(Command cmd) {
145:                throw new IllegalStateException();
146:            }
147:
148:            /**
149:             * <code>Spacers</code> are restricted to having
150:             * <code>null</code> labels, so this method will
151:             * always throw 
152:             * <code>IllegalStateException</code> whenever it is called.
153:             * 
154:             * @param label the label string
155:             *
156:             * @throws IllegalStateException always
157:             */
158:            public void setLabel(String label) {
159:                throw new IllegalStateException();
160:            }
161:
162:            /** Spacer Look & Feel associated with this Spacer */
163:            SpacerLF spacerLF;
164:
165:            /** The preferred (and minimum) width of this Spacer */
166:            int width;
167:
168:            /** The preferred (and minimum) height of this Spacer */
169:            int height;
170:
171:        }
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