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    « Gecko Plugin API Reference « Plug-in Side Plug-in API


    Contains information about the target into which the plug-in instance can draw.


    typedef struct _NPWindow
      void*        window;   /* Platform specific handle */
      uint32_t     x;        /* Coordinates of top left corner */
      uint32_t     y;        /*   relative to a Netscape page */
      uint32_t     width;    /* Maximum window size */
      uint32_t     height;
      NPRect       clipRect; /* Clipping rectangle coordinates */
    #ifdef XP_UNIX
      void *       ws_info;  /* Platform-dependent additional data */
    #endif /* XP_UNIX */
      NPWindowType type;   /* Window or drawable target */
    } NPWindow;


    The data structure has the following fields:

    Platform-specific handle to a native window element in the Netscape window hierarchy on Windows (HWND) and Unix (X Window ID). Mac OS: window is a pointer to an NP_Port.
    x, y
    The x and y coordinates for the top left corner of the plug-in relative to the page (and thus relative to the origin of the drawable). Should not be modified by the plug-in.
    height, width
    The height and width of the plug-in area. Should not be modified by the plug-in.
    Clipping rectangle of the plug-in; the origin is the top left corner of the drawable or window. Clipping to the clipRect prevents the plug-in from overwriting the status bar, scroll bars, and other page elements when partially scrolled off the screen. Mac OS: clipRect is the rectangle in port coordinates to which the plug-in should clip its drawing.
    Unix: Contains information about the plug-in's Unix window environment; points to an NPSetWindowCallbackStruct.
    NPWindowType value that specifies whether the NPWindow instance represents a window or a drawable. Values:
    • NPWindowTypeWindow: Indicates that the window field holds a platform-specific handle to a window (as in Navigator 2.0 and Navigator 3.0). The plug-in is considered windowed.
    • NPWindowTypeDrawable: Indicates that the plugin is windowless. The window field holds a platform-specific handle to a drawable or an off-screen pixmap, as follows:
      • Windows: HDC
      • Mac OS: pointer to NP_Port structure
      • Unix/X11: not used. (The drawable is provided in a GraphicsExpose event, when the paint is requested.)


    The NPWindow structure represents the native window or a drawable, and contains information about coordinate position, size, whether the plug-in is windowed or windowless, and some platform-specific information. The plug-in area is a native window element on Windows and Unix, or a rectangle within a native window on Mac OS. The x, y, height, and width coordinates of NPWindow specify the position and size of this area.

    The browser calls NPP_SetValue whenever the drawable changes.

    A windowed plug-in is drawn into a native window (or portion of a native window) on a web page. For windowed plug-ins, the browser calls the NPP_SetWindow method with an NPWindow structure that represents a drawable (a pointer to an NPWindow allocated by the browser). This window is valid until NPP_SetWindow is called again with a different window or the instance is destroyed.

    A windowless plug-in is drawn into a target called a drawable, which can be defined in several ways depending on the platform. For windowless plug-ins, the browser calls the NPP_SetWindow method with an NPWindow structure that represents a drawable.

    The plug-in should not modify the field values in this structure.

    See Also

    NPP_SetWindow, NP_Port, NPSetWindowCallbackStruct, NPRect

    Document Tags and Contributors

    Contributors to this page: Pmash, Karlt, Josh, Demos, Rickwookie
    Last updated by: Josh,