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lightning-sunbird  0.9+nobinonly
nsScriptablePeer.cpp
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00037 
00038 // ==============================
00039 // ! Scriptability related code !
00040 // ==============================
00041 //
00042 
00044 //
00045 // This file implements the nsScriptablePeer object
00046 // The native methods of this class are supposed to
00047 // be callable from JavaScript
00048 //
00049 #include "plugin.h"
00050 #include "acmeIScriptObject.h"
00051 #include "npapi.h"
00052 
00053 static NS_DEFINE_IID(kI4xScriptablePluginIID, NS_I4XSCRIPTABLEPLUGIN_IID);
00054 static NS_DEFINE_IID(kIClassInfoIID, NS_ICLASSINFO_IID);
00055 static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
00056 
00057 nsScriptablePeer::nsScriptablePeer(CPlugin* aPlugin)
00058 {
00059   mRefCnt = 0;
00060   mPlugin = aPlugin;
00061   mWindow = nsnull;
00062 }
00063 
00064 nsScriptablePeer::~nsScriptablePeer()
00065 {
00066 }
00067 
00068 // AddRef, Release and QueryInterface are common methods and must 
00069 // be implemented for any interface
00070 NS_IMETHODIMP_(nsrefcnt) nsScriptablePeer::AddRef() 
00071 { 
00072   ++mRefCnt; 
00073   return mRefCnt; 
00074 } 
00075 
00076 NS_IMETHODIMP_(nsrefcnt) nsScriptablePeer::Release() 
00077 { 
00078   --mRefCnt; 
00079   if (mRefCnt == 0) { 
00080     delete this;
00081     return 0; 
00082   } 
00083   return mRefCnt; 
00084 } 
00085 
00086 // here nsScriptablePeer should return three interfaces it can be asked for by their iid's
00087 // static casts are necessary to ensure that correct pointer is returned
00088 NS_IMETHODIMP nsScriptablePeer::QueryInterface(const nsIID& aIID, void** aInstancePtr) 
00089 { 
00090   if(!aInstancePtr) 
00091     return NS_ERROR_NULL_POINTER; 
00092 
00093   if(aIID.Equals(kI4xScriptablePluginIID)) {
00094     *aInstancePtr = static_cast<nsI4xScriptablePlugin*>(this); 
00095     AddRef();
00096     return NS_OK;
00097   }
00098 
00099   if(aIID.Equals(kIClassInfoIID)) {
00100     *aInstancePtr = static_cast<nsIClassInfo*>(this); 
00101     AddRef();
00102     return NS_OK;
00103   }
00104 
00105   if(aIID.Equals(kISupportsIID)) {
00106     *aInstancePtr = static_cast<nsISupports*>(static_cast<nsI4xScriptablePlugin*>(this)); 
00107     AddRef();
00108     return NS_OK;
00109   }
00110 
00111   return NS_NOINTERFACE; 
00112 }
00113 
00114 //
00115 // the following two methods will be callable from JavaScript
00116 //
00117 NS_IMETHODIMP nsScriptablePeer::ShowVersion()
00118 {
00119   if (mPlugin)
00120     mPlugin->showVersion();
00121 
00122   return NS_OK;
00123 }
00124 
00125 NS_IMETHODIMP nsScriptablePeer::Clear()
00126 {
00127   if (mPlugin)
00128     mPlugin->clear();
00129 
00130   return NS_OK;
00131 }
00132 
00133 NS_IMETHODIMP nsScriptablePeer::GetVersion(char * *aVersion)
00134 {
00135   if (mPlugin)
00136     mPlugin->getVersion(aVersion);
00137   return NS_OK;
00138 }
00139 
00140 NS_IMETHODIMP nsScriptablePeer::SetWindow(acmeIScriptObject *window)
00141 {
00142   NS_IF_ADDREF(window);
00143   NS_IF_RELEASE(mWindow);
00144   mWindow = window;
00145   
00146   // evaluate a JavaScript expression.
00147   acmeIScriptObject* result;
00148   nsresult rv = window->Evaluate("Math.PI", &result);
00149   if (NS_SUCCEEDED(rv) && result) {
00150       double value;
00151       result->ToNumber(&value);
00152       NS_RELEASE(result);
00153   }
00154 
00155   // read the current window's location.
00156   acmeIScriptObject* location = nsnull;
00157   rv = window->GetProperty("location", &location);
00158   if (NS_SUCCEEDED(rv) && location) {
00159     char* locationStr = NULL;
00160     rv = location->ToString(&locationStr);
00161     if (NS_SUCCEEDED(rv) && locationStr) {
00162       NPN_MemFree(locationStr);
00163     }
00164     NS_RELEASE(location);
00165   }
00166   
00167   return NS_OK;
00168 }