gecko/widget/src/gtk2/nsToolkit.cpp

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#include "nscore.h"  // needed for 'nsnull'
#include "nsGTKToolkit.h"

//
// Static thread local storage index of the Toolkit 
// object associated with a given thread...
//
static PRUintn gToolkitTLSIndex = 0;

//-------------------------------------------------------------------------
//
// constructor
//
//-------------------------------------------------------------------------
nsGTKToolkit::nsGTKToolkit()
{
    mSharedGC = nsnull;
    mFocusTimestamp = 0;
}

//-------------------------------------------------------------------------
//
// destructor
//
//-------------------------------------------------------------------------
nsGTKToolkit::~nsGTKToolkit()
{
    if (mSharedGC) {
        g_object_unref(mSharedGC);
    }

    // Remove the TLS reference to the toolkit...
    PR_SetThreadPrivate(gToolkitTLSIndex, nsnull);
}

//-------------------------------------------------------------------------
//
// nsISupports implementation macro
//
//-------------------------------------------------------------------------

NS_IMPL_ISUPPORTS1(nsGTKToolkit, nsIToolkit)

void nsGTKToolkit::CreateSharedGC(void)
{
    GdkPixmap *pixmap;

    if (mSharedGC)
        return;

    pixmap = gdk_pixmap_new(NULL, 1, 1, gdk_rgb_get_visual()->depth);
    mSharedGC = gdk_gc_new(pixmap);
    g_object_unref(pixmap);
}

GdkGC *nsGTKToolkit::GetSharedGC(void)
{
    return (GdkGC *)g_object_ref(mSharedGC);
}

//-------------------------------------------------------------------------
//
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsGTKToolkit::Init(PRThread *aThread)
{
    CreateSharedGC();
    return NS_OK;
}


//-------------------------------------------------------------------------
//
// Return the nsIToolkit for the current thread.  If a toolkit does not
// yet exist, then one will be created...
//
//-------------------------------------------------------------------------
NS_METHOD NS_GetCurrentToolkit(nsIToolkit* *aResult)
{
    nsIToolkit* toolkit = nsnull;
    nsresult rv = NS_OK;
    PRStatus status;

    // Create the TLS index the first time through...
    if (0 == gToolkitTLSIndex) {
        status = PR_NewThreadPrivateIndex(&gToolkitTLSIndex, NULL);
        if (PR_FAILURE == status) {
            rv = NS_ERROR_FAILURE;
        }
    }

    if (NS_SUCCEEDED(rv)) {
        toolkit = (nsIToolkit*)PR_GetThreadPrivate(gToolkitTLSIndex);

        //
        // Create a new toolkit for this thread...
        //
        if (!toolkit) {
            toolkit = new nsGTKToolkit();

            if (!toolkit) {
                rv = NS_ERROR_OUT_OF_MEMORY;
            } else {
                NS_ADDREF(toolkit);
                toolkit->Init(PR_GetCurrentThread());
                //
                // The reference stored in the TLS is weak.  It is
                // removed in the nsToolkit destructor...
                //
                PR_SetThreadPrivate(gToolkitTLSIndex, (void*)toolkit);
            }
        } else {
            NS_ADDREF(toolkit);
        }
        *aResult = toolkit;
    }

    return rv;
}