Source Code Cross Referenced for Composite.java in  » Ajax » GWT » com » google » gwt » user » client » ui » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » GWT » com.google.gwt.user.client.ui 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2007 Google Inc.
003:         * 
004:         * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005:         * use this file except in compliance with the License. You may obtain a copy of
006:         * the License at
007:         * 
008:         * http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012:         * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013:         * License for the specific language governing permissions and limitations under
014:         * the License.
015:         */
016:        package com.google.gwt.user.client.ui;
017:
018:        import com.google.gwt.user.client.Element;
019:
020:        /**
021:         * A type of widget that can wrap another widget, hiding the wrapped widget's
022:         * methods. When added to a panel, a composite behaves exactly as if the widget
023:         * it wraps had been added.
024:         * 
025:         * <p>
026:         * The composite is useful for creating a single widget out of an aggregate of
027:         * multiple other widgets contained in a single panel.
028:         * </p>
029:         * 
030:         * <p>
031:         * <h3>Example</h3>
032:         * {@example com.google.gwt.examples.CompositeExample}
033:         * </p>
034:         */
035:        public abstract class Composite extends Widget {
036:
037:            private Widget widget;
038:
039:            /**
040:             * This override checks to ensure {@link #initWidget(Widget)} has been called.
041:             */
042:            @Override
043:            public Element getElement() {
044:                if (widget == null) {
045:                    throw new IllegalStateException(
046:                            "initWidget() was never called in "
047:                                    + this .getClass().getName());
048:                }
049:                return super .getElement();
050:            }
051:
052:            @Override
053:            public boolean isAttached() {
054:                if (widget != null) {
055:                    return widget.isAttached();
056:                }
057:                return false;
058:            }
059:
060:            /**
061:             * Provides subclasses access to the topmost widget that defines this
062:             * composite.
063:             * 
064:             * @return the widget
065:             */
066:            protected Widget getWidget() {
067:                return widget;
068:            }
069:
070:            /**
071:             * Sets the widget to be wrapped by the composite. The wrapped widget must be
072:             * set before calling any {@link Widget} methods on this object, or adding it
073:             * to a panel. This method may only be called once for a given composite.
074:             * 
075:             * @param widget the widget to be wrapped
076:             */
077:            protected void initWidget(Widget widget) {
078:                // Validate. Make sure the widget is not being set twice.
079:                if (this .widget != null) {
080:                    throw new IllegalStateException(
081:                            "Composite.initWidget() may only be "
082:                                    + "called once.");
083:                }
084:
085:                // Detach the new child.
086:                widget.removeFromParent();
087:
088:                // Use the contained widget's element as the composite's element,
089:                // effectively merging them within the DOM.
090:                setElement(widget.getElement());
091:
092:                // Logical attach.
093:                this .widget = widget;
094:
095:                // Adopt.
096:                widget.setParent(this );
097:            }
098:
099:            @Override
100:            protected void onAttach() {
101:                widget.onAttach();
102:                onLoad();
103:            }
104:
105:            @Override
106:            protected void onDetach() {
107:                try {
108:                    onUnload();
109:                } finally {
110:                    // We don't want an exception in user code to keep us from calling the
111:                    // super implementation (or event listeners won't get cleaned up and
112:                    // the attached flag will be wrong).
113:                    widget.onDetach();
114:                }
115:            }
116:
117:            /**
118:             * This method was for initializing the Widget to be wrapped by this
119:             * Composite, but has been deprecated in favor of {@link #initWidget(Widget)}.
120:             * 
121:             * @deprecated this method is deprecated, and will be removed (use
122:             *             {@link #initWidget(Widget)} instead)
123:             */
124:            @Deprecated
125:            protected void setWidget(Widget widget) {
126:                initWidget(widget);
127:            }
128:        }
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