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lightning-sunbird  0.9+nobinonly
nsToolkit.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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00015  * The Original Code is mozilla.org code.
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00017  * The Initial Developer of the Original Code is
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00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
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00037 
00038 #include "nsToolkit.h"
00039 #include "nscore.h"
00040 #include "nsIView.h"
00041 
00042 //
00043 // Static thread local storage index of the Toolkit 
00044 // object associated with a given thread...
00045 //
00046 static PRUintn gToolkitTLSIndex = 0;
00047 
00048 NS_IMPL_ISUPPORTS1(nsToolkit,nsIToolkit)
00049 
00050 //-------------------------------------------------------------------------
00051 //
00052 // constructor
00053 //
00054 //-------------------------------------------------------------------------
00055 nsToolkit::nsToolkit()  
00056 {
00057 }
00058 
00059 
00060 //-------------------------------------------------------------------------
00061 //
00062 // destructor
00063 //
00064 //-------------------------------------------------------------------------
00065 nsToolkit::~nsToolkit()
00066 {
00067   // Remove the TLS reference to the toolkit...
00068   PR_SetThreadPrivate(gToolkitTLSIndex, nsnull);
00069 }
00070 
00071 
00072 //-------------------------------------------------------------------------
00073 //
00074 //
00075 //-------------------------------------------------------------------------
00076 NS_METHOD nsToolkit::Init(PRThread *aThread)
00077 {
00078   return NS_OK;
00079 }
00080 
00081 //-------------------------------------------------------------------------
00082 //
00083 // Return the nsIToolkit for the current thread.  If a toolkit does not
00084 // yet exist, then one will be created...
00085 //
00086 //-------------------------------------------------------------------------
00087 NS_METHOD NS_GetCurrentToolkit(nsIToolkit* *aResult)
00088 {
00089   nsIToolkit* toolkit = nsnull;
00090   nsresult rv = NS_OK;
00091   PRStatus status;
00092 
00093   // Create the TLS index the first time through...
00094   if (0 == gToolkitTLSIndex) {
00095     status = PR_NewThreadPrivateIndex(&gToolkitTLSIndex, NULL);
00096     if (PR_FAILURE == status) {
00097       rv = NS_ERROR_FAILURE;
00098     }
00099   }
00100 
00101   if (NS_SUCCEEDED(rv)) {
00102     toolkit = (nsIToolkit*)PR_GetThreadPrivate(gToolkitTLSIndex);
00103 
00104     //
00105     // Create a new toolkit for this thread...
00106     //
00107     if (!toolkit) {
00108       toolkit = new nsToolkit();
00109 
00110       if (!toolkit) {
00111         rv = NS_ERROR_OUT_OF_MEMORY;
00112       } else {
00113         NS_ADDREF(toolkit);
00114         toolkit->Init(PR_GetCurrentThread());
00115         //
00116         // The reference stored in the TLS is weak.  It is removed in the
00117         // nsToolkit destructor...
00118         //
00119         PR_SetThreadPrivate(gToolkitTLSIndex, (void*)toolkit);
00120       }
00121     } else {
00122       NS_ADDREF(toolkit);
00123     }
00124     *aResult = toolkit;
00125   }
00126 
00127   return rv;
00128 }
00129 
00130 nsIView *
00131 nsToolkit::GetViewFor(nsIWidget *aWidget)
00132 {
00133   if (!aWidget)
00134     return nsnull;
00135   nsIView *retval = nsnull;
00136   nsISupports *data = nsnull;
00137   aWidget->GetClientData((void*&)data);
00138   nsCOMPtr<nsIInterfaceRequestor> req(do_QueryInterface(data));
00139   if (req)
00140     req->GetInterface(NS_GET_IID(nsIView), (void**) &retval);
00141   return retval;
00142 }
00143