Source Code Cross Referenced for HasWidgetsTester.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.DOM;
019:
020:        import junit.framework.Assert;
021:
022:        /**
023:         * All Widgets that implement HasWidgets should derive from this test case, and
024:         * make sure to run all of its test templates.
025:         */
026:        public abstract class HasWidgetsTester {
027:
028:            /**
029:             * Used in test templates to allow the child class to specify how a widget
030:             * will be added to its container. This is necessary because
031:             * {@link HasWidgets#add(Widget)} is allowed to throw
032:             * {@link UnsupportedOperationException}.
033:             */
034:            interface WidgetAdder {
035:
036:                /**
037:                 * Adds the specified child to a container.
038:                 */
039:                void addChild(HasWidgets container, Widget child);
040:            }
041:
042:            /**
043:             * Default implementation used by containers for which
044:             * {@link HasWidgets#add(Widget)} will not throw an exception.
045:             */
046:            private static class DefaultWidgetAdder implements  WidgetAdder {
047:                public void addChild(HasWidgets container, Widget child) {
048:                    container.add(child);
049:                }
050:            }
051:
052:            private static class TestWidget extends Widget {
053:                TestWidget() {
054:                    setElement(DOM.createDiv());
055:                }
056:
057:                protected void onLoad() {
058:                    // During onLoad, isAttached must be true, and the element be a descendant
059:                    // of the body element.
060:                    Assert.assertTrue(isAttached());
061:                    Assert.assertTrue(DOM.isOrHasChild(RootPanel
062:                            .getBodyElement(), getElement()));
063:                }
064:
065:                protected void onUnload() {
066:                    // During onUnload, everything must *still* be attached.
067:                    Assert.assertTrue(isAttached());
068:                    Assert.assertTrue(DOM.isOrHasChild(RootPanel
069:                            .getBodyElement(), getElement()));
070:                }
071:            }
072:
073:            /**
074:             * Runs all tests for {@link HasWidgets}. It is recommended that tests call
075:             * this method or {@link #testAll(HasWidgets, WidgetAdder} so that future
076:             * tests are automatically included.
077:             * 
078:             * @param container
079:             */
080:            static void testAll(HasWidgets container) {
081:                testAll(container, new DefaultWidgetAdder());
082:            }
083:
084:            /**
085:             * Runs all tests for {@link HasWidgets}. It is recommended that tests call
086:             * this method or {@link #testAll(HasWidgets, WidgetAdder)} so that future
087:             * tests are automatically included.
088:             * 
089:             * @param container
090:             * @param adder
091:             */
092:            static void testAll(HasWidgets container, WidgetAdder adder) {
093:                testAttachDetachOrder(container, adder);
094:                testRemovalOfNonExistantChild(container);
095:            }
096:
097:            /**
098:             * Tests attach and detach order, assuming that the container's
099:             * {@link HasWidgets#add(Widget)} method does not throw
100:             * {@link UnsupportedOperationException}.
101:             * 
102:             * @param test
103:             * @param container
104:             * @see #testAttachDetachOrder(TestCase, HasWidgets,
105:             *      com.google.gwt.user.client.ui.HasWidgetsTester.WidgetAdder)
106:             */
107:            static void testAttachDetachOrder(HasWidgets container) {
108:                testAttachDetachOrder(container, new DefaultWidgetAdder());
109:            }
110:
111:            /**
112:             * Ensures that children are attached and detached in the proper order. This
113:             * must result in the child's onLoad() method being called just *after* its
114:             * element is attached to the DOM, and its onUnload method being called just
115:             * *before* its element is detached from the DOM.
116:             */
117:            static void testAttachDetachOrder(HasWidgets container,
118:                    WidgetAdder adder) {
119:                // Make sure the container's attached.
120:                Assert.assertTrue(container instanceof  Widget);
121:                RootPanel.get().add((Widget) container);
122:
123:                // Adding and removing the test widget will cause it to test onLoad and
124:                // onUnload order.
125:                TestWidget widget = new TestWidget();
126:                adder.addChild(container, widget);
127:                container.remove(widget);
128:
129:                // After removal, the widget should be detached.
130:                Assert.assertFalse(widget.isAttached());
131:                Assert.assertFalse(DOM.isOrHasChild(RootPanel.getBodyElement(),
132:                        widget.getElement()));
133:            }
134:
135:            /**
136:             * Tests to ensure that {@link HasWidgets#remove(Widget)} is resilient to
137:             * being called with a widget that is not present as a child in the container.
138:             * 
139:             * @param container
140:             */
141:            static void testRemovalOfNonExistantChild(HasWidgets container) {
142:                TestWidget widget = new TestWidget();
143:                container.remove(widget);
144:            }
145:        }
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