Back to index

lightning-sunbird  0.9+nobinonly
nsToolkit.cpp
Go to the documentation of this file.
00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include "nscore.h"  // needed for 'nsnull'
00039 #include "nsToolkit.h"
00040 
00041 //
00042 // Static thread local storage index of the Toolkit 
00043 // object associated with a given thread...
00044 //
00045 static PRUintn gToolkitTLSIndex = 0;
00046 
00047 //-------------------------------------------------------------------------
00048 //
00049 // constructor
00050 //
00051 //-------------------------------------------------------------------------
00052 nsToolkit::nsToolkit()
00053 {
00054   mSharedGC = nsnull;
00055 }
00056 
00057 //-------------------------------------------------------------------------
00058 //
00059 // destructor
00060 //
00061 //-------------------------------------------------------------------------
00062 nsToolkit::~nsToolkit()
00063 {
00064   if (mSharedGC) {
00065     gdk_gc_unref(mSharedGC);
00066   }
00067 
00068   // Remove the TLS reference to the toolkit...
00069   PR_SetThreadPrivate(gToolkitTLSIndex, nsnull);
00070 }
00071 
00072 //-------------------------------------------------------------------------
00073 //
00074 // nsISupports implementation macro
00075 //
00076 //-------------------------------------------------------------------------
00077 
00078 NS_IMPL_ISUPPORTS1(nsToolkit, nsIToolkit)
00079 
00080 void nsToolkit::CreateSharedGC(void)
00081 {
00082   GdkPixmap *pixmap;
00083 
00084   if (mSharedGC)
00085     return;
00086 
00087   pixmap = gdk_pixmap_new(NULL, 1, 1, gdk_rgb_get_visual()->depth);
00088   mSharedGC = gdk_gc_new(pixmap);
00089   gdk_pixmap_unref(pixmap);
00090 }
00091 
00092 GdkGC *nsToolkit::GetSharedGC(void)
00093 {
00094   return gdk_gc_ref(mSharedGC);
00095 }
00096 
00097 //-------------------------------------------------------------------------
00098 //
00099 //
00100 //-------------------------------------------------------------------------
00101 NS_IMETHODIMP nsToolkit::Init(PRThread *aThread)
00102 {
00103   CreateSharedGC();
00104 
00105   return NS_OK;
00106 }
00107 
00108 
00109 //-------------------------------------------------------------------------
00110 //
00111 // Return the nsIToolkit for the current thread.  If a toolkit does not
00112 // yet exist, then one will be created...
00113 //
00114 //-------------------------------------------------------------------------
00115 NS_METHOD NS_GetCurrentToolkit(nsIToolkit* *aResult)
00116 {
00117   nsIToolkit* toolkit = nsnull;
00118   nsresult rv = NS_OK;
00119   PRStatus status;
00120 
00121   // Create the TLS index the first time through...
00122   if (0 == gToolkitTLSIndex) {
00123     status = PR_NewThreadPrivateIndex(&gToolkitTLSIndex, NULL);
00124     if (PR_FAILURE == status) {
00125       rv = NS_ERROR_FAILURE;
00126     }
00127   }
00128 
00129   if (NS_SUCCEEDED(rv)) {
00130     toolkit = (nsIToolkit*)PR_GetThreadPrivate(gToolkitTLSIndex);
00131 
00132     //
00133     // Create a new toolkit for this thread...
00134     //
00135     if (!toolkit) {
00136       toolkit = new nsToolkit();
00137 
00138       if (!toolkit) {
00139         rv = NS_ERROR_OUT_OF_MEMORY;
00140       } else {
00141         NS_ADDREF(toolkit);
00142         toolkit->Init(PR_GetCurrentThread());
00143         //
00144         // The reference stored in the TLS is weak.  It is removed in the
00145         // nsToolkit destructor...
00146         //
00147         PR_SetThreadPrivate(gToolkitTLSIndex, (void*)toolkit);
00148       }
00149     } else {
00150       NS_ADDREF(toolkit);
00151     }
00152     *aResult = toolkit;
00153   }
00154 
00155   return rv;
00156 }
00157 
00158