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       XmDisplay — The Display widget class "XmDisplay" "widget class" "XmDisplay"


       #include <Xm/Display.h>


       The XmDisplay object is used by the Motif widgets to store information that is specific to
       a display. It also allows the toolkit to access certain information on widget  hierarchies
       that would otherwise be unavailable. Each client has one XmDisplay object for each display
       it accesses.

       An XmDisplay object is automatically created when the application creates the first  shell
       on  a display (usually accomplished by a call to XtAppInitialize or XtAppCreateShell).  It
       is not necessary to create an XmDisplay object by any other means.  An application can use
       the  function  XmGetXmDisplay  to obtain the widget ID of the XmDisplay object for a given

       An application cannot supply initial values for XmDisplay resources as arguments to a call
       to  any  function that creates widgets.  The application or user can supply initial values
       in a resource file.  After creating the first shell on the display,  the  application  can
       use  XmGetXmDisplay  to  obtain  the  widget  ID  of  the  XmDisplay  object and then call
       XtSetValues to set the XmDisplay resources.

       XmDisplay resources specify the drag protocol style for a client participating in drag and
       drop  transactions.  The  two  basic  protocol  types  are preregister and dynamic. When a
       preregister protocol is used, the toolkit handles any communication between the  initiator
       and receiver clients and displays the appropriate drag-over and drag-under visual effects.
       A client registers its drop sites in advance and this information is stored in a  property
       for  each top-level window. When the drag pointer enters a top-level window, the drop site
       information is read by the initiator. A dynamic protocol allows the source and destination
       clients to dynamically communicate drag and drop state information between each other, and
       to update their respective visuals accordingly. The toolkit provides drop site information
       as  the  pointer  passes  over any given drop site.  In this mode, a receiver can supply a
       procedure to generate its own drag-under effects.

       Display inherits behavior and resources from Core, Composite, Shell, WMShell, VendorShell,
       TopLevelShell, and ApplicationShell classes.

       The class pointer is xmDisplayClass.

       The class name is XmDisplay.

   New Resources
       The  following  table  defines a set of widget resources used by the programmer to specify
       data. The programmer can also set the resource values for the  inherited  classes  to  set
       attributes  for  this widget.  To reference a resource by name or by class in a .Xdefaults
       file, remove the XmN or XmC prefix and use the remaining letters.  To specify one  of  the
       defined  values  for  a  resource  in  a .Xdefaults file, remove the Xm prefix and use the
       remaining letters (in either lowercase or uppercase, but include any  underscores  between
       words).  The  codes  in  the  access  column  indicate if the given resource can be set at
       creation time (C), set by using XtSetValues (S), retrieved by using XtGetValues (G), or is
       not applicable (N/A).

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