XmCascadeButton(library call) XmCascadeButton(library call)
NAMEXmCascadeButton — The CascadeButton widget class
SYNOPSIS
#include <Xm/CascadeB.h>
DESCRIPTION
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 XmN‐
mappingDelay.
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; other‐
wise, it takes Label's default, which is 2.
CascadeButton uses the XmQTmenuSystem and XmQTspecifyRenderTable
traits.
Classes
CascadeButton inherits behavior, resources, and traits from Core,
XmPrimitive, and XmLabel classes.
The class pointer is xmCascadeButtonWidgetClass.
The class name is XmCascadeButton.
New Resources
The following table defines a set of widget resources used by the pro‐
grammer to specify data. The programmer can also set the resource val‐
ues 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).
┌───────────────────────────────────────────────────────────────────────────┐
│ │ XmCascadeButton Resource Set │ │ │
│Name │ Class │ Type │ Default │ Access │
├─────────────────────┼─────────────────┼────────────────┼─────────┼────────┤
│XmNactivateCallback │ XmCCallback │ XtCallbackList │ NULL │ C │
├─────────────────────┼─────────────────┼────────────────┼─────────┼────────┤
│XmNcascadePixmap │ XmCPixmap │ Pixmap │ dynamic │ CSG │
├─────────────────────┼─────────────────┼────────────────┼─────────┼────────┤
│XmNcascadingCallback │ XmCCallback │ XtCallbackList │ NULL │ C │
├─────────────────────┼─────────────────┼────────────────┼─────────┼────────┤
│XmNmappingDelay │ XmCMappingDelay │ int │ 180 ms │ CSG │
├─────────────────────┼─────────────────┼────────────────┼─────────┼────────┤
│XmNsubMenuId │ XmCMenuWidget │ Widget │ NULL │ CSG │
├─────────────────────┼─────────────────┼────────────────┼─────────┼────────┤
└─────────────────────┴─────────────────┴────────────────┴─────────┴────────┘
XmNactivateCallback
Specifies the list of callbacks that is called when the user
activates the CascadeButton widget and there is no submenu
attached to pop up. The activation occurs when a mouse button
is released or when the mnemonic associated with the widget
is typed. The specific mouse button depends on information in
the RowColumn parent. The reason sent by the callback is
XmCR_ACTIVATE.
XmNcascadePixmap
Specifies the cascade pixmap displayed on one end of the wid‐
get when a CascadeButton is used within a Popup or Pulldown
menu pane and a submenu is attached. The Label class
resources XmNmarginBottom, XmNmarginLeft, XmNmarginRight, and
XmNmarginTop may be modified to ensure that room is left for
the cascade pixmap. The default cascade pixmap is an arrow
pointing to the side of the menu where the submenu will
appear. The positioning of the cascade pixmap to either the
left of right of the widget, and the direction of the arrow,
depend on the XmNlayoutDirection resource of the MenuShell.
XmNcascadingCallback
Specifies the list of callbacks that is called just prior to
the mapping of the submenu associated with CascadeButton. The
reason sent by the callback is XmCR_CASCADING.
XmNmappingDelay
Specifies the amount of time, in milliseconds, between when a
CascadeButton becomes armed and when it maps its submenu.
This delay is used only when the widget is within a Popup or
Pulldown menu pane. The value must not be negative.
XmNsubMenuId
Specifies the widget ID for the Pulldown menu pane to be
associated with this CascadeButton. The specified menu pane
is displayed when the CascadeButton becomes armed. The menu
pane must have been created with the appropriate parentage
depending on the type of menu used. See XmCreateMenuBar(3),
XmCreatePulldownMenu(3), and XmCreatePopupMenu(3) for more
information on the menu systems.
Inherited Resources
CascadeButton inherits behavior and resources from the superclasses
described in the following tables. For a complete description of each
resource, refer to the reference page for that superclass.
┌────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ │ XmLabel Resource Set │ │ │
│Name │ Class │ Type │ Default │ Access │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNaccelerator │ XmCAccelerator │ String │ NULL │ N/A │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNacceleratorText │ XmCAcceleratorText │ XmString │ NULL │ N/A │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNalignment │ XmCAlignment │ unsigned char │ dynamic │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNfontList │ XmCFontList │ XmFontList │ dynamic │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNlabelInsensitivePixmap │ XmCLabelInsensitivePixmap │ Pixmap │ XmUNSPECIFIED_PIXMAP │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNlabelPixmap │ XmCLabelPixmap │ Pixmap │ XmUNSPECIFIED_PIXMAP │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNlabelString │ XmCXmString │ XmString │ dynamic │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNlabelType │ XmCLabelType │ unsigned char │ XmSTRING │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNmarginBottom │ XmCMarginBottom │ Dimension │ dynamic │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNmarginHeight │ XmCMarginHeight │ Dimension │ 2 │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNmarginLeft │ XmCMarginLeft │ Dimension │ 0 │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNmarginRight │ XmCMarginRight │ Dimension │ dynamic │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNmarginTop │ XmCMarginTop │ Dimension │ dynamic │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNmarginWidth │ XmCMarginWidth │ Dimension │ dynamic │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNmnemonic │ XmCMnemonic │ KeySym │ NULL │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNmnemonicCharSet │ XmCMnemonicCharSet │ String │ XmFONTLIST_DEFAULT_TAG │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNrecomputeSize │ XmCRecomputeSize │ Boolean │ True │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNrenderTable │ XmCRenderTable │ XmRenderTable │ dynamic │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
│XmNstringDirection │ XmCStringDirection │ XmStringDirection │ dynamic │ CSG │
├──────────────────────────┼───────────────────────────┼───────────────────┼────────────────────────┼────────┤
└──────────────────────────┴───────────────────────────┴───────────────────┴────────────────────────┴────────┘
┌───────────────────────────────────────────────────────────────────────────────────────────────────┐
│ │ XmPrimitive│Resource Set │ │ │
│Name │ Class │ Type │ Default │ Access │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNbottomShadowColor │ XmCBottomShadowColor │ Pixel │ dynamic │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNbottomShadowPixmap │ XmCBottomShadowPixmap │ Pixmap │ XmUNSPECIFIED_PIXMAP │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNconvertCallback │ XmCCallback │ XtCallbackList │ NULL │ C │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNforeground │ XmCForeground │ Pixel │ dynamic │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNhelpCallback │ XmCCallback │ XtCallbackList │ NULL │ C │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNhighlightColor │ XmCHighlightColor │ Pixel │ dynamic │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNhighlightOnEnter │ XmCHighlightOnEnter │ Boolean │ False │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNhighlightPixmap │ XmCHighlightPixmap │ Pixmap │ dynamic │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNhighlightThickness │ XmCHighlightThickness │ Dimension │ 0 │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNlayoutDirection │ XmCLayoutDirection │ XmDirection │ dynamic │ CG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNnavigationType │ XmCNavigationType │ XmNavigationType │ XmNONE │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNpopupHandlerCallback │ XmCCallback │ XtCallbackList │ NULL │ C │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNshadowThickness │ XmCShadowThickness │ Dimension │ 2 │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNtopShadowColor │ XmCTopShadowColor │ Pixel │ dynamic │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNtopShadowPixmap │ XmCTopShadowPixmap │ Pixmap │ dynamic │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNtraversalOn │ XmCTraversalOn │ Boolean │ dynamic │ G │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNunitType │ XmCUnitType │ unsigned char │ dynamic │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
│XmNuserData │ XmCUserData │ XtPointer │ NULL │ CSG │
├────────────────────────┼───────────────────────┼──────────────────┼──────────────────────┼────────┤
└────────────────────────┴───────────────────────┴──────────────────┴──────────────────────┴────────┘
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ │ Core Resource Set │ │ │
│Name │ Class │ Type │ Default │ Access │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNaccelerators │ XmCAccelerators │ XtAccelerators │ dynamic │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNancestorSensitive │ XmCSensitive │ Boolean │ dynamic │ G │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNbackground │ XmCBackground │ Pixel │ dynamic │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNbackgroundPixmap │ XmCPixmap │ Pixmap │ XmUNSPECIFIED_PIXMAP │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNborderColor │ XmCBorderColor │ Pixel │ XtDefaultForeground │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNborderPixmap │ XmCPixmap │ Pixmap │ XmUNSPECIFIED_PIXMAP │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNborderWidth │ XmCBorderWidth │ Dimension │ 0 │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNcolormap │ XmCColormap │ Colormap │ dynamic │ CG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNdepth │ XmCDepth │ int │ dynamic │ CG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNdestroyCallback │ XmCCallback │ XtCallbackList │ NULL │ C │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNheight │ XmCHeight │ Dimension │ dynamic │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNinitialResourcesPersistent │ XmCInitialResourcesPersistent │ Boolean │ True │ C │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNmappedWhenManaged │ XmCMappedWhenManaged │ Boolean │ True │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNscreen │ XmCScreen │ Screen * │ dynamic │ CG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNsensitive │ XmCSensitive │ Boolean │ True │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNtranslations │ XmCTranslations │ XtTranslations │ dynamic │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNwidth │ XmCWidth │ Dimension │ dynamic │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNx │ XmCPosition │ Position │ 0 │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
│XmNy │ XmCPosition │ Position │ 0 │ CSG │
├──────────────────────────────┼───────────────────────────────┼────────────────┼──────────────────────┼────────┤
└──────────────────────────────┴───────────────────────────────┴────────────────┴──────────────────────┴────────┘
Callback Information
A pointer to the following structure is passed to each callback:
typedef struct
{
int reason;
XEvent * event;
} XmAnyCallbackStruct;
reason Indicates why the callback was invoked
event Points to the XEvent that triggered the callback or is NULL
if this callback was not triggered due to an XEvent
Translations
XmCascadeButton includes translations from XmPrimitive. XmCascadeBut‐
ton includes the menu traversal translations from XmLabel.
Note that altering translations in #override or #augment mode is unde‐
fined.
The following list describes the translations for a CascadeButton in a
MenuBar. The following key names are listed in the X standard key
event translation table syntax. This format is the one used by Motif
to specify the widget actions corresponding to a given key. A brief
overview of the format is provided under VirtualBindings(3). For a
complete description of the format, please refer to the X Toolkit
Instrinsics Documentation.
<EnterWindow>Normal:
MenuBarEnter()
<LeaveWindow>Normal:
MenuBarLeave()
<Btn2Down>:
ProcessDrag()
c<BtnDown>:
MenuButtonTakeFocusUp()
c<BtnUp>: MenuButtonTakeFocusUp()
∼c<BtnDown>:
MenuBarSelect()
∼c<BtnUp>:
DoSelect()
:<Key><osfSelect>:
KeySelect()
:<Key><osfActivate>:
KeySelect()
:<Key><osfHelp>:
Help()
:<Key><osfCancel>:
CleanupMenuBar()
∼s<Key>Return:
KeySelect()
∼s<Key>space:
KeySelect()
The following list describes the translations for a CascadeButton in a
PullDown or Popup MenuPane. In a Popup menu system, <Btn3> also per‐
forms the <Btn1> actions.
<EnterWindow>:
DelayedArm()
<LeaveWindow>:
CheckDisarm()
<Btn2Down>:
ProcessDrag()
c<BtnDown>:
MenuButtonTakeFocus()
c<BtnUp>: MenuButtonTakeFocusUp()
∼c<BtnDown>:
StartDrag()
∼c<BtnUp>:
DoSelect()
:<Key><osfSelect>:
KeySelect()
:<Key><osfActivate>:
KeySelect()
:<Key><osfHelp>:
Help()
:<Key><osfCancel>:
CleanupMenuBar()
∼s<Key>Return:
KeySelect()
∼s<Key>space:
KeySelect()
Action Routines
The XmCascadeButton action routines are
CleanupMenuBar():
In a MenuBar, disarms the CascadeButton and the menu and,
when the shell's keyboard focus policy is XmEXPLICIT,
restores keyboard focus to the widget that had the focus
before the menu was entered.
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 XmEXPLICIT,
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, when the shell's
keyboard focus policy is XmEXPLICIT, restores keyboard focus
to the widget from which the menu was posted.
DoSelect():
Calls the callbacks in XmNcascadingCallback, posts the sub‐
menu attached to the CascadeButton and enables keyboard tra‐
versal within the menu. If the CascadeButton does not have a
submenu attached, this action calls the callbacks in XmNacti‐
vateCallback, activates the CascadeButton, and unposts all
posted menus in the cascade.
Help(): Unposts all menus in the menu hierarchy and, when the shell's
keyboard focus policy is XmEXPLICIT, 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.
KeySelect():
Calls the callbacks in XmNcascadingCallback, and posts the
submenu attached to the CascadeButton if keyboard traversal
is enabled in the menu. If the CascadeButton does not have a
submenu attached, this action calls the callbacks in XmNacti‐
vateCallback, activates the CascadeButton, and unposts all
posted menus in the cascade.
MenuBarSelect():
Unposts any menus posted by the parent menu. Arms both the
CascadeButton and the MenuBar, posts the associated submenu,
and enables mouse traversal. If the menu is already active,
this event disables keyboard traversal for the menu and
returns the menu to mouse traversal mode.
StartDrag():
Arms the CascadeButton, posts the associated submenu, and
enables mouse traversal. If the menu is already active, this
event disables keyboard traversal for the menu and returns
the menu to mouse traversal mode.
Additional Behavior
Posting a submenu calls the XmNcascadingCallback callbacks. This wid‐
get has the following additional behavior:
<EnterWindow>:
If keyboard traversal is enabled, does nothing. Otherwise,
in a MenuBar that is armed, unposts any MenuPanes associated
with another MenuBar entry, arms the CascadeButton, and posts
the associated submenu. In other menus, arms the CascadeBut‐
ton and posts the associated submenu after the delay speci‐
fied by XmNmappingDelay.
<LeaveWindow>:
If keyboard traversal is enabled does nothing. Otherwise, in
a MenuBar that is armed, disarms the CascadeButton if the
submenu associated with the CascadeButton is not currently
posted or if there is no submenu associated with the Cascade‐
Button.
In other menus, if the pointer moves anywhere except into a
submenu associated with the CascadeButton, the CascadeButton
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(3).
RELATEDCore(3), XmCascadeButtonHighlight(3), XmCreateCascadeButton(3), XmCre‐
ateMenuBar(3), XmCreatePulldownMenu(3), XmCreatePopupMenu(3), XmLa‐
bel(3), XmPrimitive(3), and XmRowColumn(3).
XmCascadeButton(library call)
