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XmCascadeButtonGadget(3X) XmCascadeButtonGadget(3X)

NAME
XmCascadeButtonGadget - The CascadeButtonGadget widget class

SYNOPSIS
#include <Xm/CascadeBG.h>

DESCRIPTION
CascadeButtonGadget links two MenuPanes, a MenuBar to a MenuPane, or an OptionMenu to a MenuPane.

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

It is the only gadget that can have a Pulldown MenuPane attached to it as a submenu. The submenu is displayed when this gadget is acti-
vated 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 MenuPane; or it can include only a label or a pixmap when it is in an OptionMenu.

The default behavior associated with a CascadeButtonGadget depends on the type of menu system in which it resides. By default, BSelect con-
trols the behavior of the CascadeButtonGadget. In addition, BMenu controls the behavior of the CascadeButtonGadget if it resides in a Pop-
upMenu system. The actual mouse button used is determined by its RowColumn parent.

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 MenuPane 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 sim-
ply passing through the gadget), or the user really wanted the submenu posted. This delay is configurable via 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 CascadeButton-
Gadget is visible. If the CascadeButtonGadget 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 via the keyboard.

If a CascadeButtonGadget is in a Pulldown or Popup MenuPane and there is a submenu attached, the XmNmarginBottom, XmNmarginLeft, XmNmargin-
Right, 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.

Classes
CascadeButtonGadget inherits behavior and resources from 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).

XmCascadeButtonGadget

Class: XmCCallback Default: NULL Type: XtCallbackList Access: C Class: XmCPixmap Default: dynamic Type: Pixmap Access: CSG Class: XmC-
Callback Default: NULL Type: XtCallbackList Access: C Class: XmCMappingDelay Default: 180 ms Type: int Access: CSG Class: XmCMenuWidget
Default: NULL Type: Widget Access: CSG

Specifies the list of callbacks that is called when the user activates the CascadeButtonGadget, and there is no submenu attached to
pop up. The activation occurs by releasing a mouse button or by typing the mnemonic associated with the gadget. The specific mouse
button depends on information in the RowColumn parent. The reason sent by the callback is XmCR_ACTIVATE. Specifies the cascade
pixmap displayed on one end of the gadget when a CascadeButtonGadget is used within a Popup or Pulldown MenuPane and a submenu is
attached. The LabelGadget class resources XmNmarginBottom, XmNmarginLeft, XmNmarginRight, and XmNmarginTop may be modified to ensure
that room is left for the cascade pixmap. The default cascade pixmap in menus other than option menus is an arrow pointing to the
side of the menu where the submenu will appear. The default for the CascadeButtonGadget in an option menu is XmUNSPECIFIED_PIXMAP.
Specifies the list of callbacks that is called just prior to the mapping of the submenu associated with the CascadeButtonGadget.
The reason sent by the callback is XmCR_CASCADING. Specifies the amount of time, in milliseconds, between when a CascadeButtonGad-
get becomes armed and when it maps its submenu. This delay is used only when the gadget is within a Popup or Pulldown MenuPane. The
value must not be negative. Specifies the widget ID for the Pulldown MenuPane to be associated with this CascadeButtonGadget. The
specified MenuPane is displayed when the CascadeButtonGadget becomes armed. The MenuPane must have been created with the appropri-
ate parentage depending on the type of menu used. See XmCreatePulldownMenu(3X), XmCreatePopupMenu(3X), and XmCreateOptionMenu(3X)
for more information on the menu systems.

Inherited Resources
CascadeButtonGadget inherits behavior and resources from the following superclasses. For a complete description of each resource, refer to
the man page for that superclass.

XmLabelGadget Resource Set

Class: XmCAccelerator Default: NULL Type: String Access: N/A Class: XmCAcceleratorText Default: NULL Type: XmString Access: N/A Class:
XmCAlignment Default: dynamic Type: unsigned char Access: CSG Class: XmCFontList Default: dynamic Type: XmFontList Access: CSG Class:
XmCLabelInsensitivePixmap Default: XmUNSPECIFIED_PIXMAP Type: Pixmap Access: CSG Class: XmCLabelPixmap Default: XmUNSPECIFIED_PIXMAP Type:
Pixmap Access: CSG Class: XmCXmString Default: dynamic Type: XmString Access: CSG Class: XmCLabelType Default: XmSTRING Type: unsigned
char Access: CSG Class: XmCMarginBottom Default: dynamic Type: Dimension Access: CSG Class: XmCMarginHeight Default: 2 Type: Dimension
Access: CSG Class: XmCMarginLeft Default: 0 Type: Dimension Access: CSG Class: XmCMarginRight Default: dynamic Type: Dimension Access:
CSG Class: XmCMarginTop Default: dynamic Type: Dimension Access: CSG Class: XmCMarginWidth Default: dynamic Type: Dimension Access: CSG
Class: XmCMnemonic Default: NULL Type: KeySym Access: CSG Class: XmCMnemonicCharSet Default: dynamic Type: String Access: CSG Class:
XmCRecomputeSize Default: True Type: Boolean Access: CSG Class: XmCStringDirection Default: dynamic Type: XmStringDirection Access: CSG

XmGadget Resource Set

Class: XmCBottomShadowColor Default: dynamic Type: Pixel Access: G Class: XmCCallback Default: NULL Type: XtCallbackList Access: C Class:
XmCHighlightColor Default: dynamic Type: Pixel Access: G Class: XmCHighlightOnEnter Default: False Type: Boolean Access: CSG Class:
XmCHighlightThickness Default: 0 Type: Dimension Access: CSG Class: XmCNavigationType Default: XmNONE Type: XmNavigationType Access: CSG
Class: XmCShadowThickness Default: 2 Type: Dimension Access: CSG Class: XmCTopShadowColor Default: dynamic Type: Pixel Access: G Class:
XmCTraversalOn Default: True Type: Boolean Access: CSG Class: XmCUnitType Default: dynamic Type: unsigned char Access: CSG Class:
XmCUserData Default: NULL Type: XtPointer Access: CSG

RectObj Resource Set

Class: XmCSensitive Default: dynamic Type: Boolean Access: G Class: XmCBorderWidth Default: 0 Type: Dimension Access: CSG Class:
XmCHeight Default: dynamic Type: Dimension Access: CSG Class: XmCSensitive Default: True Type: Boolean Access: CSG Class: XmCWidth
Default: dynamic Type: Dimension Access: CSG Class: XmCPosition Default: 0 Type: Position Access: CSG Class: XmCPosition Default: 0 Type:
Position Access: CSG

Object Resource Set

Class: XmCCallback Default: NULL Type: XtCallbackList Access: C

Callback Information
A pointer to the following structure is passed to each callback: typedef struct {
int reason;
XEvent * event; } XmAnyCallbackStruct;

Indicates why the callback was invoked. Points to the XEvent that triggered the callback or is NULL if this callback was not triggered by
an XEvent.

Behavior
XmCascadeButtonGadget includes behavior from XmGadget. XmCascadeButton includes the menu traversal behavior from XmLabel. Additional XmCas-
cadeButtonGadget behavior is described below (in a Popup menu system, BMenu also performs the BSelect actions): Unposts any menus posted by
the parent menu. Arms the CascadeButtonGadget, posts the associated submenu, enables mouse traversal, and, in a MenuBar, arms the MenuBar.
If the menu is already active, this event disables keyboard traversal for the menu and returns the menu to mouse traversal mode. Calls the
callbacks in XmNcascadingCallback, posts the submenu attached to the CascadeButtonGadget and enables keyboard traversal within the menu. If
the CascadeButtonGadget does not have a submenu attached, calls the callbacks in XmNactivateCallback, the CascadeButtonGadget is activated
and all posted menus in the cascade are unposted. Calls the callbacks in XmNcascadingCallback, and posts the submenu attached to the Cas-
cadeButtonGadget if keyboard traversal is enabled in the menu. If the CascadeButtonGadget does not have a submenu attached, calls the call-
backs in XmNactivateCallback, the CascadeButtonGadget is activated and all posted menus in the cascade are unposted. This action applies
only to gadgets in MenuBars, PulldownMenus, and PopupMenus. For a CascadeButtonGadget in an OptionMenu, if the parent is a manager, this
action passes the event to the parent. Calls the callbacks in XmNcascadingCallback, and posts the submenu attached to the CascadeButton-
Gadget if keyboard traversal is enabled in the menu. If the CascadeButtonGadget does not have a submenu attached, calls the callbacks in
XmNactivateCallback, the CascadeButtonGadget is activated and all posted menus in the cascade are unposted. Unposts all menus in the menu
hierarchy and, when the shell's keyboard focus policy is XmEXPLICT, restores keyboard focus to the widget that had the focus before the
menu system was entered. Calls the callbacks for XmNhelpCallback if any exist. If there are no help callbacks for this widget, this action
calls the help callbacks for the nearest ancestor that has them. In a MenuBar, disarms the CascadeButtonGadget and the menu and, when the
shell's keyboard focus policy is XmEXPLICT, restores keyboard focus to the widget that had the focus before the menu was entered. For a
CascadeButtonGadget in an OptionMenu, if the parent is a manager, this action passes the event to the parent.

In a toplevel Pulldown MenuPane from a MenuBar, unposts the menu, disarms the MenuBar CascadeButton and the MenuBar, and, when the
shell's keyboard focus policy is XmEXPLICT, restores keyboard focus to the widget that had the focus before the MenuBar was entered.
In other Pulldown MenuPanes, unposts the menu.

In a Popup MenuPane, unposts the menu and restores keyboard focus to the widget from which the menu was posted. If keyboard traver-
sal is enabled does nothing. Otherwise, in a MenuBar, unposts any MenuPanes associated with another MenuBar entry, arms the Cascade-
ButtonGadget, and posts the associated submenu. In other menus, arms the CascadeButtonGadget and posts the associated submenu after
the delay specified by XmNmappingDelay. If keyboard traversal is enabled does nothing. Otherwise, in a MenuBar, disarms the Cas-
cadeButtonGadget if the submenu associated with the CascadeButtonGadget is not currently posted or if there is no submenu associated
with the CascadeButtonGadget.

In other menus, if the pointer moves anywhere except into a submenu associated with the CascadeButtonGadget, the CascadeButtonGadget
is disarmed and its submenu is unposted.

Virtual Bindings
The bindings for virtual keys are vendor specific. For information about bindings for virtual buttons and keys, see VirtualBindings(3X).

SEE ALSO
Object(3X), RectObj(3X), XmCascadeButtonHighlight(3X), XmCreateCascadeButtonGadget(3X), XmCreatePulldownMenu(3X), XmCreatePopupMenu(3X),
XmCreateOptionMenu(3X), XmGadget(3X), XmLabelGadget(3X), XmRowColumn(3X)

XmCascadeButtonGadget(3X)

osf1 man page for xmcascadebuttongadget