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lightning-sunbird  0.9+nobinonly
nsToolkit.cpp
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00039 
00040 #include "nscore.h"  // needed for 'nsnull'
00041 #include "nsToolkit.h"
00042 
00043 //
00044 // Static thread local storage index of the Toolkit 
00045 // object associated with a given thread...
00046 //
00047 static PRUintn gToolkitTLSIndex = 0;
00048 
00049 //-------------------------------------------------------------------------
00050 //
00051 // constructor
00052 //
00053 //-------------------------------------------------------------------------
00054 nsToolkit::nsToolkit()
00055 {
00056     mSharedGC = nsnull;
00057 }
00058 
00059 //-------------------------------------------------------------------------
00060 //
00061 // destructor
00062 //
00063 //-------------------------------------------------------------------------
00064 nsToolkit::~nsToolkit()
00065 {
00066     if (mSharedGC) {
00067         gdk_gc_unref(mSharedGC);
00068     }
00069 
00070     // Remove the TLS reference to the toolkit...
00071     PR_SetThreadPrivate(gToolkitTLSIndex, nsnull);
00072 }
00073 
00074 //-------------------------------------------------------------------------
00075 //
00076 // nsISupports implementation macro
00077 //
00078 //-------------------------------------------------------------------------
00079 
00080 NS_IMPL_ISUPPORTS1(nsToolkit, nsIToolkit)
00081 
00082 void nsToolkit::CreateSharedGC(void)
00083 {
00084     GdkPixmap *pixmap;
00085 
00086     if (mSharedGC)
00087         return;
00088 
00089     pixmap = gdk_pixmap_new(NULL, 1, 1, gdk_rgb_get_visual()->depth);
00090     mSharedGC = gdk_gc_new(pixmap);
00091     gdk_pixmap_unref(pixmap);
00092 }
00093 
00094 GdkGC *nsToolkit::GetSharedGC(void)
00095 {
00096     return gdk_gc_ref(mSharedGC);
00097 }
00098 
00099 //-------------------------------------------------------------------------
00100 //
00101 //
00102 //-------------------------------------------------------------------------
00103 NS_IMETHODIMP nsToolkit::Init(PRThread *aThread)
00104 {
00105     CreateSharedGC();
00106 
00107     return NS_OK;
00108 }
00109 
00110 
00111 //-------------------------------------------------------------------------
00112 //
00113 // Return the nsIToolkit for the current thread.  If a toolkit does not
00114 // yet exist, then one will be created...
00115 //
00116 //-------------------------------------------------------------------------
00117 NS_METHOD NS_GetCurrentToolkit(nsIToolkit* *aResult)
00118 {
00119     nsIToolkit* toolkit = nsnull;
00120     nsresult rv = NS_OK;
00121     PRStatus status;
00122 
00123     // Create the TLS index the first time through...
00124     if (0 == gToolkitTLSIndex) {
00125         status = PR_NewThreadPrivateIndex(&gToolkitTLSIndex, NULL);
00126         if (PR_FAILURE == status) {
00127             rv = NS_ERROR_FAILURE;
00128         }
00129     }
00130 
00131     if (NS_SUCCEEDED(rv)) {
00132         toolkit = (nsIToolkit*)PR_GetThreadPrivate(gToolkitTLSIndex);
00133 
00134         //
00135         // Create a new toolkit for this thread...
00136         //
00137         if (!toolkit) {
00138             toolkit = new nsToolkit();
00139 
00140             if (!toolkit) {
00141                 rv = NS_ERROR_OUT_OF_MEMORY;
00142             } else {
00143                 NS_ADDREF(toolkit);
00144                 toolkit->Init(PR_GetCurrentThread());
00145                 //
00146                 // The reference stored in the TLS is weak.  It is
00147                 // removed in the nsToolkit destructor...
00148                 //
00149                 PR_SetThreadPrivate(gToolkitTLSIndex, (void*)toolkit);
00150             }
00151         } else {
00152             NS_ADDREF(toolkit);
00153         }
00154         *aResult = toolkit;
00155     }
00156 
00157     return rv;
00158 }
00159 
00160