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       XmCascadeButton   —  The  CascadeButton  widget  class  "XmCascadeButton"  "widget  class"


       #include <Xm/CascadeB.h>


       CascadeButton links two menu panes or a MenuBar to a menu pane.

       It is used in menu systems and must have a  RowColumn  parent  with  its  XmNrowColumnType
       resource set to XmMENU_BAR, XmMENU_POPUP or XmMENU_PULLDOWN.

       It  is the only widget that can have a Pulldown menu pane attached to it as a submenu. The
       submenu is displayed when this widget is activated within a MenuBar,  a  PopupMenu,  or  a
       PulldownMenu.  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  a  MenuBar.   The  positioning  of  the PulldownMenu with respect to the CascadeButton
       depends on the XmNlayoutDirection resource of the MenuShell.

       The default behavior associated with a CascadeButton depends on the type of menu system in
       which  it  resides.   By  default, BSelect controls the behavior of the CascadeButton.  In
       addition, BMenu controls the behavior of the CascadeButton 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 CascadeButton'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 CascadeButton within a Pulldown or Popup menu pane is armed as the  result  of  the
       user  moving  the  mouse  pointer  into  the  widget,  it does not immediately display its
       submenu. Instead, it waits a short amount of time to see if the arming was temporary (that
       is, the user was simply passing through the widget), or whether the user really wanted the
       submenu posted. This time delay is configurable using XmNmappingDelay.

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

       If  the Cascadebutton 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 Label's default, which is 2.

       CascadeButton uses the XmQTmenuSystem and XmQTspecifyRenderTable traits.

       CascadeButton inherits behavior, resources, and traits from Core, XmPrimitive, and XmLabel

       The class pointer is xmCascadeButtonWidgetClass.

       The class name is XmCascadeButton.

   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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