HelperAppLauncherDialog


1   /*******************************************************************************
2    * Copyright (c) 2003, 2007 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.swt.browser;
12  
13  import org.eclipse.swt.*;
14  import org.eclipse.swt.internal.C;
15  import org.eclipse.swt.internal.mozilla.*;
16  import org.eclipse.swt.widgets.*;
17  
18  class HelperAppLauncherDialog {
19      XPCOMObject supports;
20      XPCOMObject helperAppLauncherDialog;
21      int refCount = 0;
22  
23  public HelperAppLauncherDialog () {
24      createCOMInterfaces ();
25  }
26  
27  int AddRef () {
28      refCount++;
29      return refCount;
30  }
31  
32  void createCOMInterfaces () {
33      /* Create each of the interfaces that this object implements */
34      supports = new XPCOMObject (new int[] {2, 0, 0}) {
35          public int /*long*/ method0 (int /*long*/[] args) {return QueryInterface (args[0], args[1]);}
36          public int /*long*/ method1 (int /*long*/[] args) {return AddRef ();}
37          public int /*long*/ method2 (int /*long*/[] args) {return Release ();}
38      };
39      
40      helperAppLauncherDialog = new XPCOMObject (new int[] {2, 0, 0, 3, 5}) {
41          public int /*long*/ method0 (int /*long*/[] args) {return QueryInterface (args[0], args[1]);}
42          public int /*long*/ method1 (int /*long*/[] args) {return AddRef ();}
43          public int /*long*/ method2 (int /*long*/[] args) {return Release ();}
44          public int /*long*/ method3 (int /*long*/[] args) {return Show (args[0], args[1], args[2]);}
45          public int /*long*/ method4 (int /*long*/[] args) {return PromptForSaveToFile (args[0], args[1], args[2], args[3], args[4]);}
46      };      
47  }
48  
49  void disposeCOMInterfaces () {
50      if (supports != null) {
51          supports.dispose ();
52          supports = null;
53      }   
54      if (helperAppLauncherDialog != null) {
55          helperAppLauncherDialog.dispose ();
56          helperAppLauncherDialog = null; 
57      }
58  }
59  
60  int /*long*/ getAddress () {
61      return helperAppLauncherDialog.getAddress ();
62  }
63  
64  int /*long*/ QueryInterface (int /*long*/ riid, int /*long*/ ppvObject) {
65      if (riid == 0 || ppvObject == 0) return XPCOM.NS_ERROR_NO_INTERFACE;
66      nsID guid = new nsID ();
67      XPCOM.memmove (guid, riid, nsID.sizeof);
68      
69      if (guid.Equals (nsISupports.NS_ISUPPORTS_IID)) {
70          XPCOM.memmove (ppvObject, new int /*long*/[] {supports.getAddress ()}, C.PTR_SIZEOF);
71          AddRef ();
72          return XPCOM.NS_OK;
73      }
74      if (guid.Equals (nsIHelperAppLauncherDialog.NS_IHELPERAPPLAUNCHERDIALOG_IID)) {
75          XPCOM.memmove (ppvObject, new int /*long*/[] {helperAppLauncherDialog.getAddress ()}, C.PTR_SIZEOF);
76          AddRef ();
77          return XPCOM.NS_OK;
78      }
79      
80      XPCOM.memmove (ppvObject, new int /*long*/[] {0}, C.PTR_SIZEOF);
81      return XPCOM.NS_ERROR_NO_INTERFACE;
82  }
83              
84  int Release () {
85      refCount--;
86      /*
87      * Note.  This instance lives as long as the download it is binded to.
88      * Its reference count is expected to go down to 0 when the download
89      * has completed or when it has been cancelled. E.g. when the user
90      * cancels the File Dialog, cancels or closes the Download Dialog
91      * and when the Download Dialog goes away after the download is completed.
92      */
93      if (refCount == 0) disposeCOMInterfaces ();
94      return refCount;
95  }
96  
97  /* nsIHelperAppLauncherDialog */
98  
99  public int /*long*/ Show (int /*long*/ aLauncher, int /*long*/ aContext, int /*long*/ aReason) {
100     /*
101      * The interface for nsIHelperAppLauncher changed as of mozilla 1.8.  Query the received
102      * nsIHelperAppLauncher for the new interface, and if it is not found then fall back to
103      * the old interface. 
104      */
105     nsISupports supports = new nsISupports (aLauncher);
106     int /*long*/[] result = new int /*long*/[1];
107     int rc = supports.QueryInterface (nsIHelperAppLauncher_1_8.NS_IHELPERAPPLAUNCHER_IID, result);
108     if (rc == 0) {  /* >= 1.8 */
109         nsIHelperAppLauncher_1_8 helperAppLauncher = new nsIHelperAppLauncher_1_8 (aLauncher);
110         rc = helperAppLauncher.SaveToDisk (0, false);
111         helperAppLauncher.Release ();
112         return rc;
113     }
114     nsIHelperAppLauncher helperAppLauncher = new nsIHelperAppLauncher (aLauncher);  /* < 1.8 */
115     return helperAppLauncher.SaveToDisk (0, false);
116 }
117 
118 public int /*long*/ PromptForSaveToFile (int /*long*/ arg0, int /*long*/ arg1, int /*long*/ arg2, int /*long*/ arg3, int /*long*/ arg4) {
119     int /*long*/ aDefaultFile, aSuggestedFileExtension, _retval;
120     boolean hasLauncher = false;
121 
122     /*
123     * The interface for nsIHelperAppLauncherDialog changed as of mozilla 1.5 when an
124     * extra argument was added to the PromptForSaveToFile method (this resulted in all
125     * subsequent arguments shifting right).  The workaround is to provide an XPCOMObject 
126     * that fits the newer API, and to use the first argument's type to infer whether
127     * the old or new nsIHelperAppLauncherDialog interface is being used (and by extension
128     * the ordering of the arguments).  In mozilla >= 1.5 the first argument is an
129     * nsIHelperAppLauncher. 
130     */
131     /*
132      * The interface for nsIHelperAppLauncher changed as of mozilla 1.8, so the first
133      * argument must be queried for both the old and new nsIHelperAppLauncher interfaces. 
134      */
135     nsISupports support = new nsISupports (arg0);
136     int /*long*/[] result = new int /*long*/[1];
137     int rc = support.QueryInterface (nsIHelperAppLauncher_1_8.NS_IHELPERAPPLAUNCHER_IID, result);
138     boolean usingMozilla18 = rc == 0;
139     if (usingMozilla18) {
140         hasLauncher = true;
141         nsISupports supports = new nsISupports (result[0]);
142         supports.Release ();
143     } else {
144         result[0] = 0;
145         rc = support.QueryInterface (nsIHelperAppLauncher.NS_IHELPERAPPLAUNCHER_IID, result);
146         if (rc == 0) {
147             hasLauncher = true;
148             nsISupports supports = new nsISupports (result[0]);
149             supports.Release ();
150         }
151     }
152     result[0] = 0;
153 
154     if (hasLauncher) {  /* >= 1.5 */
155         aDefaultFile = arg2;
156         aSuggestedFileExtension = arg3;
157         _retval = arg4;
158     } else {            /* 1.4 */
159         aDefaultFile = arg1;
160         aSuggestedFileExtension = arg2;
161         _retval = arg3;
162     }
163 
164     int length = XPCOM.strlen_PRUnichar (aDefaultFile);
165     char[] dest = new char[length];
166     XPCOM.memmove (dest, aDefaultFile, length * 2);
167     String   defaultFile = new String   (dest);
168 
169     length = XPCOM.strlen_PRUnichar (aSuggestedFileExtension);
170     dest = new char[length];
171     XPCOM.memmove (dest, aSuggestedFileExtension, length * 2);
172     String   suggestedFileExtension = new String   (dest);
173 
174     Shell shell = new Shell ();
175     FileDialog fileDialog = new FileDialog (shell, SWT.SAVE);
176     fileDialog.setFileName (defaultFile);
177     fileDialog.setFilterExtensions (new String  [] {suggestedFileExtension});
178     String   name = fileDialog.open ();
179     shell.close ();
180     if (name == null) {
181         if (hasLauncher) {
182             if (usingMozilla18) {
183                 nsIHelperAppLauncher_1_8 launcher = new nsIHelperAppLauncher_1_8 (arg0);
184                 rc = launcher.Cancel (XPCOM.NS_BINDING_ABORTED);
185             } else {
186                 nsIHelperAppLauncher launcher = new nsIHelperAppLauncher (arg0);
187                 rc = launcher.Cancel ();
188             }
189             if (rc != XPCOM.NS_OK) Mozilla.error (rc);
190             return XPCOM.NS_OK;
191         }
192         return XPCOM.NS_ERROR_FAILURE;
193     }
194     nsEmbedString path = new nsEmbedString (name);
195     rc = XPCOM.NS_NewLocalFile (path.getAddress (), true, result);
196     path.dispose ();
197     if (rc != XPCOM.NS_OK) Mozilla.error (rc);
198     if (result[0] == 0) Mozilla.error (XPCOM.NS_ERROR_NULL_POINTER);
199     /* Our own nsIDownload has been registered during the Browser initialization. It will be invoked by Mozilla. */
200     XPCOM.memmove (_retval, result, C.PTR_SIZEOF);  
201     return XPCOM.NS_OK;
202 }
203 }
204
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