modules/plugin/sdk/samples/basic/windows/plugin.cpp

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  37
  38
  39 #include <windows.h>
  40 #include <windowsx.h>
  41
  42 #include "plugin.h"
  43
  44 //////////////////////////////////////
  45 //
  46 // general initialization and shutdown
  47 //
  48 NPError NS_PluginInitialize()
  49 {
  50   return NPERR_NO_ERROR;
  51 }
  52
  53 void NS_PluginShutdown()
  54 {
  55 }
  56
  57 /////////////////////////////////////////////////////////////
  58 //
  59 // construction and destruction of our plugin instance object
  60 //
  61 nsPluginInstanceBase * NS_NewPluginInstance(nsPluginCreateData * aCreateDataStruct)
  62 {
  63   if(!aCreateDataStruct)
  64     return NULL;
  65
  66   nsPluginInstance * plugin = new nsPluginInstance(aCreateDataStruct->instance);
  67   return plugin;
  68 }
  69
  70 void NS_DestroyPluginInstance(nsPluginInstanceBase * aPlugin)
  71 {
  72   if(aPlugin)
  73     delete (nsPluginInstance *)aPlugin;
  74 }
  75
  76 ////////////////////////////////////////
  77 //
  78 // nsPluginInstance class implementation
  79 //
  80 nsPluginInstance::nsPluginInstance(NPP aInstance) : nsPluginInstanceBase(),
  81   mInstance(aInstance),
  82   mInitialized(FALSE)
  83 {
  84   mhWnd = NULL;
  85 }
  86
  87 nsPluginInstance::~nsPluginInstance()
  88 {
  89 }
  90
  91 static LRESULT CALLBACK PluginWinProc(HWND, UINT, WPARAM, LPARAM);
  92 static WNDPROC lpOldProc = NULL;
  93
  94 NPBool nsPluginInstance::init(NPWindow* aWindow)
  95 {
  96   if(aWindow == NULL)
  97     return FALSE;
  98
  99   mhWnd = (HWND)aWindow->window;
 100   if(mhWnd == NULL)
 101     return FALSE;
 102
 103   // subclass window so we can intercept window messages and
 104   // do our drawing to it
 105   lpOldProc = SubclassWindow(mhWnd, (WNDPROC)PluginWinProc);
 106
 107   // associate window with our nsPluginInstance object so we can access
 108   // it in the window procedure
 109   SetWindowLong(mhWnd, GWL_USERDATA, (LONG)this);
 110
 111   mInitialized = TRUE;
 112   return TRUE;
 113 }
 114
 115 void nsPluginInstance::shut()
 116 {
 117   // subclass it back
 118   SubclassWindow(mhWnd, lpOldProc);
 119   mhWnd = NULL;
 120   mInitialized = FALSE;
 121 }
 122
 123 NPBool nsPluginInstance::isInitialized()
 124 {
 125   return mInitialized;
 126 }
 127
 128 const char * nsPluginInstance::getVersion()
 129 {
 130   return NPN_UserAgent(mInstance);
 131 }
 132
 133 static LRESULT CALLBACK PluginWinProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
 134 {
 135   switch (msg) {
 136     case WM_PAINT:
 137       {
 138         // draw a frame and display the string
 139         PAINTSTRUCT ps;
 140         HDC hdc = BeginPaint(hWnd, &ps);
 141         RECT rc;
 142         GetClientRect(hWnd, &rc);
 143         FrameRect(hdc, &rc, GetStockBrush(BLACK_BRUSH));
 144
 145         // get our plugin instance object and ask it for the version string
 146         nsPluginInstance *plugin = (nsPluginInstance *)GetWindowLong(hWnd, GWL_USERDATA);
 147         if (plugin) {
 148           const char * string = plugin->getVersion();
 149           DrawText(hdc, string, strlen(string), &rc, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
 150         }
 151         else {
 152           char string[] = "Error occured";
 153           DrawText(hdc, string, strlen(string), &rc, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
 154         }
 155
 156         EndPaint(hWnd, &ps);
 157       }
 158       break;
 159     default:
 160       break;
 161   }
 162
 163   return DefWindowProc(hWnd, msg, wParam, lParam);
 164 }