Source Code Cross Referenced for BrowserWidgetIE6.java in  » Ajax » GWT » com » google » gwt » dev » shell » ie » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » GWT » com.google.gwt.dev.shell.ie 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2006 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.dev.shell.ie;
017:
018:        import com.google.gwt.core.ext.TreeLogger;
019:        import com.google.gwt.dev.shell.BrowserWidget;
020:        import com.google.gwt.dev.shell.BrowserWidgetHost;
021:        import com.google.gwt.dev.shell.ModuleSpaceHost;
022:
023:        import org.eclipse.swt.SWTException;
024:        import org.eclipse.swt.internal.ole.win32.COM;
025:        import org.eclipse.swt.internal.ole.win32.IDispatch;
026:        import org.eclipse.swt.ole.win32.OleAutomation;
027:        import org.eclipse.swt.ole.win32.Variant;
028:        import org.eclipse.swt.widgets.Shell;
029:
030:        import java.lang.reflect.InvocationTargetException;
031:        import java.lang.reflect.Method;
032:
033:        /**
034:         * Represents an individual browser window and all of its controls.
035:         */
036:        public class BrowserWidgetIE6 extends BrowserWidget {
037:
038:            /**
039:             * IDispatch implementation of the window.external object.
040:             */
041:            public class External extends IDispatchImpl {
042:
043:                /**
044:                 * Called by the loaded HTML page to activate a new module.
045:                 * 
046:                 * @param frameWnd a reference to the IFRAME in which the module's injected
047:                 *          JavaScript will live
048:                 * @param moduleName the name of the module to load, null if this is being
049:                 *          unloaded
050:                 */
051:                public boolean gwtOnLoad(IDispatch frameWnd, String moduleName) {
052:                    try {
053:                        if (moduleName == null) {
054:                            // Indicates one or more modules are being unloaded.
055:                            handleUnload(frameWnd);
056:                            return true;
057:                        }
058:
059:                        // set the module ID
060:                        int moduleID = ++nextModuleID;
061:                        Integer key = new Integer(moduleID);
062:                        setIntProperty(frameWnd, "__gwt_module_id", moduleID);
063:
064:                        // Attach a new ModuleSpace to make it programmable.
065:                        //
066:                        ModuleSpaceHost msh = getHost().createModuleSpaceHost(
067:                                BrowserWidgetIE6.this , moduleName);
068:                        ModuleSpaceIE6 moduleSpace = new ModuleSpaceIE6(msh,
069:                                frameWnd, moduleName, key);
070:                        attachModuleSpace(moduleSpace);
071:                        return true;
072:                    } catch (Throwable e) {
073:                        // We do catch Throwable intentionally because there are a ton of things
074:                        // that can go wrong trying to load a module, including Error-derived
075:                        // things like NoClassDefFoundError.
076:                        // 
077:                        getHost().getLogger().log(TreeLogger.ERROR,
078:                                "Failure to load module '" + moduleName + "'",
079:                                e);
080:                        return false;
081:                    }
082:                }
083:
084:                @Override
085:                protected void getIDsOfNames(String[] names, int[] ids)
086:                        throws HResultException {
087:
088:                    if (names.length >= 2) {
089:                        throw new HResultException(DISP_E_UNKNOWNNAME);
090:                    }
091:
092:                    String name = names[0].toLowerCase();
093:                    if (name.equals("gwtonload")) {
094:                        ids[0] = 1;
095:                        return;
096:                    }
097:
098:                    throw new HResultException(DISP_E_UNKNOWNNAME);
099:                }
100:
101:                /**
102:                 * Unload one or more modules.
103:                 * 
104:                 * @param frameWnd window to unload, null if all
105:                 */
106:                protected void handleUnload(IDispatch frameWnd) {
107:                    Integer key = null;
108:                    if (frameWnd != null) {
109:                        key = new Integer(getIntProperty(frameWnd,
110:                                "__gwt_module_id"));
111:                    }
112:                    doUnload(key);
113:                }
114:
115:                @Override
116:                protected Variant invoke(int dispId, int flags, Variant[] params)
117:                        throws HResultException, InvocationTargetException {
118:
119:                    if (dispId == 0 && (flags & COM.DISPATCH_PROPERTYGET) != 0) {
120:                        // MAGIC: this is the default property, let's just do toString()
121:                        return new Variant(toString());
122:                    } else if (dispId == 1) {
123:                        if ((flags & COM.DISPATCH_METHOD) != 0) {
124:                            try {
125:                                IDispatch frameWnd = (params[0].getType() == COM.VT_DISPATCH) ? params[0]
126:                                        .getDispatch()
127:                                        : null;
128:                                String moduleName = (params[1].getType() == COM.VT_BSTR) ? params[1]
129:                                        .getString()
130:                                        : null;
131:                                boolean success = gwtOnLoad(frameWnd,
132:                                        moduleName);
133:
134:                                // boolean return type
135:                                return new Variant(success);
136:                            } catch (SWTException e) {
137:                                throw new HResultException(COM.E_INVALIDARG);
138:                            }
139:                        } else if ((flags & COM.DISPATCH_PROPERTYGET) != 0) {
140:                            // property get on the method itself
141:                            try {
142:                                Method gwtOnLoadMethod = getClass().getMethod(
143:                                        "gwtOnLoad",
144:                                        new Class[] { IDispatch.class,
145:                                                String.class });
146:                                IDispatchImpl funcObj = new MethodDispatch(
147:                                        null, gwtOnLoadMethod);
148:                                IDispatch disp = new IDispatch(funcObj
149:                                        .getAddress());
150:                                disp.AddRef();
151:                                return new Variant(disp);
152:                            } catch (Exception e) {
153:                                // just return VT_EMPTY
154:                                return new Variant();
155:                            }
156:                        }
157:                        throw new HResultException(COM.E_NOTSUPPORTED);
158:                    }
159:
160:                    // The specified member id is out of range.
161:                    throw new HResultException(COM.DISP_E_MEMBERNOTFOUND);
162:                }
163:            }
164:
165:            // counter to generate unique module IDs
166:            private static int nextModuleID = 0;
167:
168:            /**
169:             * Get a property off a window object as an integer.
170:             * 
171:             * @param frameWnd inner code frame
172:             * @param propName name of the property to get
173:             * @return the property value as an integer
174:             * @throws RuntimeException if the property does not exist
175:             */
176:            private static int getIntProperty(IDispatch frameWnd,
177:                    String propName) {
178:                OleAutomation window = null;
179:                try {
180:                    window = new OleAutomation(frameWnd);
181:                    int[] dispID = window
182:                            .getIDsOfNames(new String[] { propName });
183:                    if (dispID == null) {
184:                        throw new RuntimeException("No such property "
185:                                + propName);
186:                    }
187:                    Variant value = null;
188:                    try {
189:                        value = window.getProperty(dispID[0]);
190:                        return value.getInt();
191:                    } finally {
192:                        if (value != null) {
193:                            value.dispose();
194:                        }
195:                    }
196:                } finally {
197:                    if (window != null) {
198:                        window.dispose();
199:                    }
200:                }
201:            }
202:
203:            /**
204:             * Set a property off a window object from an integer value.
205:             * 
206:             * @param frameWnd inner code frame
207:             * @param propName name of the property to set
208:             * @param intValue the value to set
209:             * @throws RuntimeException if the property does not exist
210:             */
211:            private static void setIntProperty(IDispatch frameWnd,
212:                    String propName, int intValue) {
213:                OleAutomation window = null;
214:                try {
215:                    window = new OleAutomation(frameWnd);
216:                    int[] dispID = window
217:                            .getIDsOfNames(new String[] { propName });
218:                    if (dispID == null) {
219:                        throw new RuntimeException("No such property "
220:                                + propName);
221:                    }
222:                    Variant value = null;
223:                    try {
224:                        value = new Variant(intValue);
225:                        window.setProperty(dispID[0], value);
226:                    } finally {
227:                        if (value != null) {
228:                            value.dispose();
229:                        }
230:                    }
231:                } finally {
232:                    if (window != null) {
233:                        window.dispose();
234:                    }
235:                }
236:            }
237:
238:            public BrowserWidgetIE6(Shell shell, BrowserWidgetHost host) {
239:                super (shell, host);
240:
241:                // Expose a 'window.external' object. This object's onLoad() method will
242:                // be called when a hosted mode application's wrapper HTML is done loading.
243:                //
244:                SwtOleGlue.injectBrowserScriptExternalObject(browser,
245:                        new External());
246:
247:                // Make sure that the LowLevelIE6 magic is properly initialized.
248:                //
249:                LowLevelIE6.init();
250:            }
251:
252:            @Override
253:            public String getUserAgent() {
254:                // See UserAgent.gwt.xml
255:                return "ie6";
256:            }
257:        }
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