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       XmCascadeButtonGadget — The CascadeButtonGadget widget class


       #include <Xm/CascadeBG.h>


       CascadeButtonGadget  links two menu panes, a MenuBar to a menu pane, or an OptionMenu to a
       menu pane.

       It is used in menu systems and must have a  RowColumn  parent  with  its  XmNrowColumnType

       It  is the only gadget that can have a Pulldown menu pane attached to it as a submenu. The
       submenu is displayed when this gadget is activated within a PopupMenu, a PulldownMenu,  or
       an OptionMenu. Its visuals can include a label or pixmap and a cascading indicator when it
       is in a Popup or Pulldown menu pane; or it can include only a label or a pixmap when it is
       in  an  OptionMenu.  The positioning of the PulldownMenu with respect to the CascadeButton
       depends on the XmNlayoutDirection resource of the MenuShell.

       The default behavior associated with a CascadeButtonGadget depends on  the  type  of  menu
       system   in  which  it  resides.   By  default,  BSelect  controls  the  behavior  of  the
       CascadeButtonGadget.  In addition, BMenu controls the behavior of the  CascadeButtonGadget
       if  it  resides  in a PopupMenu system.  The actual mouse button used is determined by its
       RowColumn parent.  BMenu also performs the BSelect actions in all types of menu systems.

       A CascadeButtonGadget's visuals differ from most other button  gadgets.  When  the  button
       becomes  armed,  its  visuals change from a 2-D to a 3-D look, and it displays the submenu
       that has been attached to it. If no submenu is attached, it simply changes its visuals.

       When a CascadeButtonGadget within a Pulldown or Popup menu pane is armed as the result  of
       the  user  moving  the  mouse pointer into the gadget, it does not immediately display its
       submenu. Instead, it waits a short time to see if the arming was temporary (that  is,  the
       user was simply passing through the gadget), or the user really wanted the submenu posted.
       This delay is configurable using XmNmappingDelay.

       CascadeButtonGadget provides a  single  mechanism  for  activating  the  gadget  from  the
       keyboard.  This  mechanism  is referred to as a keyboard mnemonic.  If a mnemonic has been
       specified for the gadget, the user may activate it by simply typing the mnemonic while the
       CascadeButtonGadget  is  visible.   If  the  CascadeButtonGadget  is  in a MenuBar and the
       MenuBar does not have focus,  the  MAlt  modifier  must  be  pressed  with  the  mnemonic.
       Mnemonics are typically used to interact with a menu using the keyboard.

       If  a  CascadeButtonGadget  is  in  a  Pulldown  or Popup menu pane and there is a submenu
       attached, the XmNmarginBottom, XmNmarginLeft, XmNmarginRight, and  XmNmarginTop  resources
       may  enlarge  to  accommodate  XmNcascadePixmap.   XmNmarginWidth  defaults  to  6 if this
       resource is in a MenuBar; otherwise, it takes LabelGadget's default, which is 2.

       CascadeButtonGadget uses the XmQTmenuSystem and XmQTspecifyRenderTable traits.

       CascadeButtonGadget inherits behavior, resources, and traits  from  the  Object,  RectObj,
       XmGadget, and XmLabelGadget classes.

       The class pointer is xmCascadeButtonGadgetClass.

       The class name is XmCascadeButtonGadget.

   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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