XmScreen(library call) XmScreen(library call)
NAMEXmScreen — The Screen widget class
SYNOPSIS
#include <Xm/Screen.h>
DESCRIPTION
The XmScreen object is used by Motif widgets to store information that
is specific to a screen. It also allows the toolkit to store certain
information on widget hierarchies that would otherwise be unavailable.
Each client has one XmScreen object for each screen that it accesses.
An XmScreen object is automatically created when the application cre‐
ates the first shell on a screen (usually accomplished by a call to
XtAppInitialize or XtAppCreateShell). It is not necessary to create an
XmScreen object by any other means. An application can use the func‐
tion XmGetXmScreen to obtain the widget ID of the XmScreen object for a
given screen.
An application cannot supply initial values for XmScreen resources as
arguments to a call to any function that creates widgets. The applica‐
tion or user can supply initial values in a resource file. After cre‐
ating the first shell on the screen, the application can use XmGetXm‐
Screen to obtain the widget ID of the XmScreen object and then call
XtSetValues to set the XmScreen resources.
Classes
Screen inherits behavior and resources from Core.
The class pointer is xmScreenClass.
The class name is XmScreen.
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 an .Xdefaults file, remove
the XmN or XmC prefix and use the remaining letters. To specify one of
the defined values for a resource in an .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).
┌─────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ │ XmScreen Resource│Set │ │ │
│Name │ Class │ Type │ Default │ Access │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNbitmapConversionModel │ XmCBitmapConversionModel │ XtEnum │ XmPIXMAP │ CSG?? │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNcolorAllocationProc │ XmCColorAllocationProc │ XtProc │ NULL │ CSG?? │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNcolorCalculationProc │ XmCColorCalculationProc │ XtProc │ NULL │ CSG?? │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNdarkThreshold │ XmCDarkThreshold │ int │ dynamic │ C │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNdefaultCopyCursorIcon │ XmCDefaultCopyCursorIcon │ Widget │ NULL │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNdefaultInvalidCursorIcon │ XmCDefaultInvalidCursorIcon │ Widget │ NULL │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNdefaultLinkCursorIcon │ XmCDefaultLinkCursorIcon │ Widget │ NULL │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNdefaultMoveCursorIcon │ XmCDefaultMoveCursorIcon │ Widget │ NULL │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNdefaultNoneCursorIcon │ XmCDefaultNoneCursorIcon │ Widget │ NULL │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNdefaultSourceCursorIcon │ XmCDefaultSourceCursorIcon │ Widget │ NULL │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNdefaultValidCursorIcon │ XmCDefaultValidCursorIcon │ Widget │ NULL │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNfont │ XmCFont │ XFontStruct * │ NULL │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNforegroundThreshold │ XmCForegroundThreshold │ int │ dynamic │ C │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNhorizontalFontUnit │ XmCHorizontalFontUnit │ int │ dynamic │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNinsensitiveStippleBitmap │ XmCinsensitiveStippleBitmap │ Bitmap │ "50_foreground" │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNlightThreshold │ XmCLightThreshold │ int │ dynamic │ C │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNmenuCursor │ XmCCursor │ Cursor │ arrow │ C │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNmoveOpaque │ XmCMoveOpaque │ Boolean │ False │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNunpostBehavior │ XmCUnpostBehavior │ unsigned char │ XmUNPOST_AND_REPLAY │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNuseColorObject │ XmCUseColorObject │ Boolean │ False │ C │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNuserData │ XmCUserData │ XtPointer │ NULL │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
│XmNverticalFontUnit │ XmCVerticalFontUnit │ int │ dynamic │ CSG │
├────────────────────────────┼─────────────────────────────┼───────────────┼─────────────────────┼────────┤
└────────────────────────────┴─────────────────────────────┴───────────────┴─────────────────────┴────────┘
XmNbitmapConversionModel
Provides a policy for the conversion of xbm and xpm files to
the Pixmap type. This resource takes the following values:
XmMATCH_DEPTH
From a supplied xbm or xpm file, generates a con‐
verted pixmap file having the same depth as the
widget.
XmDYNAMIC_DEPTH
Converts an input xbm file to a Pixmap of depth 1,
or converts an input xpm file to a Pixmap having
the same depth as the widget.
XmNcolorAllocationProc
Identifies the procedure to be used for color allocation.
Normally, this procedure is an application-defined color
allocation procedure. However, if no application-defined
color allocation procedure is set, the system uses Motif's
predefined color allocation procedure.
XmNcolorCalculationProc
Identifies the procedure to be used for per-widget color cal‐
culation. Normally, this procedure is an application-defined
color calculation procedure. However, if no application-
defined color calculation procedure is set, the system uses
Motif's predefined color calculation procedure.
XmNdarkThreshold
An integer between 0 (zero) and 100, inclusive, that speci‐
fies a level of perceived brightness for a color. If the per‐
ceived brightness of the background color is below this
level, Motif treats the background as "dark" when computing
default shadow and select colors. If this resource is speci‐
fied for a particular screen, it applies to widgets created
on that screen; otherwise it applies to widgets created on
all screens. The default value is implementation specific.
XmNdefaultCopyCursorIcon
Specifies the DragIcon used during a drag operation when the
operation is a copy and no other pixmap is specified by the
application. If this resource is NULL, a system default icon
is used. The system default icon is determined by the Dis‐
play resource XmNenableDragIcon.
XmNdefaultInvalidCursorIcon
Specifies the DragIcon used to indicate that the cursor is
over an invalid drop site during a drag operation when no
other pixmap symbol is specified by the application. If this
resource is NULL, a system default icon is used. The system
default icon is determined by the Display resource XmNenable‐
DragIcon.
XmNdefaultLinkCursorIcon
Specifies the DragIcon used during a drag operation when the
operation is a link and no other pixmap is specified by the
application. If this resource is NULL, a system default icon
is used. The system default icon is determined by the Dis‐
play resource XmNenableDragIcon.
XmNdefaultMoveCursorIcon
Specifies the DragIcon used during a drag operation when the
operation is a move and no other pixmap is specified by the
application. If this resource is NULL, a system default icon
is used. The system default icon is determined by the Dis‐
play resource XmNenableDragIcon.
XmNdefaultNoneCursorIcon
Specifies the DragIcon used to indicate that the cursor is
not over a drop site during a drag operation when no other
pixmap is specified by the application. If this resource is
NULL, a system default icon is used. The system default icon
is determined by the Display resource XmNenableDragIcon.
XmNdefaultSourceCursorIcon
Specifies the depth-1 pixmap used as a cursor when an XmN‐
sourceCursorIcon is not provided by the DragContext, or it is
not usable. If this resource is NULL, a system default icon
is used. The system default icon is determined by the Dis‐
play resource XmNenableDragIcon.
XmNdefaultValidCursorIcon
Specifies the DragIcon used to indicate that the cursor is
over a valid drop site during a drag operation when no other
pixmap is specified by the application. If this resource is
NULL, a system default icon is used. The system default icon
is determined by the Display resource XmNenableDragIcon.
XmNfont Specifies a font for use in computing values for XmNhorizon‐
talFontUnit and XmNverticalFontUnit. When an application is
initialized, this resource can be supplied in a resource file
or through the standard command line options -fn, -font, and
-xrm. Note that this resource is used only for the calcula‐
tion of the font unit values. To specify a font to be used to
display text, use a widget's render table resource (XmNren‐
derTable).
XmNforegroundThreshold
An integer between 0 (zero) and 100, inclusive, that speci‐
fies a level of perceived brightness for a color. If the per‐
ceived brightness of the background color is equal to or
below this level, Motif treats the background as "dark" when
computing the default foreground and highlight colors. If the
perceived brightness of the background color is above this
level, Motif treats the background as "light" when computing
the default foreground and highlight colors. When the back‐
ground is "dark," the default foreground and highlight is
white; when the background is "light," the default foreground
and highlight is black. If this resource is specified for a
particular screen, it applies to widgets created on that
screen; otherwise, it applies to widgets created on all
screens. The default value is implementation specific.
XmNhorizontalFontUnit
Specifies the horizontal component of the font units used by
XmConvertUnits, and is used to interpret the values of geome‐
try resources when the XmNshellUnitType resource of Vendor‐
Shell or the XmNunitType resource of Gadget, Manager, or
Primitive has the value Xm100TH_FONT_UNITS. If no initial
value is supplied for this resource, the default is computed
from the font specified in XmNfont. If no initial value is
supplied for this resource or for XmNfont, the default is 10.
If a call to XtSetValues specifies a value for XmNhorizontal‐
FontUnit, this resource is set to that value. If a call to
XtSetValues specifies a value for XmNfont but not for XmNhor‐
izontalFontUnit, this resource is set to a value computed
from the new XmNfont.
A horizontal font unit is derived from a font as follows:
· If the font has an AVERAGE_WIDTH property, the horizon‐
tal font unit is the AVERAGE_WIDTH property divided by
10.
· If the font has no AVERAGE_WIDTH property but has a
QUAD_WIDTH property, the horizontal font unit is the
QUAD_WIDTH property.
· If the font has no AVERAGE_WIDTH or QUAD_WIDTH prop‐
erty, the horizontal font unit is the sum of the font
structure's min_bounds.width and max_bounds.width
divided by 2.3.
XmNinsensitiveStippleBitmap
Provides widgets with the bitmap to use when generating the
insensitive visual. This bitmap is to be used as the stipple
for the rendering of insensitive visuals.
XmNlightThreshold
An integer between 0 (zero) and 100, inclusive, that speci‐
fies a level of perceived brightness for a color. If the per‐
ceived brightness of the background color is above this
level, Motif treats the background as "light" when computing
default shadow and select colors. If this resource is speci‐
fied for a particular screen, it applies to widgets created
on that screen; otherwise, it applies to widgets created on
all screens. The default value is implementation specific.
XmNmenuCursor
Sets a variable that controls the cursor used whenever this
application posts a menu. This resource can be specified only
once at application startup time, either by placing it within
a defaults file or by using the -xrm command line argument.
For example:
myProg -xrm "*menuCursor: arrow"
The menu cursor can also be selected in the program through
the function XmSetMenuCursor. The following list shows
acceptable cursor names. If the application does not specify
a cursor or if an invalid name is supplied, the default cur‐
sor (an arrow pointing up and to the right) is used.
X_cursor leftbutton
arrow ll_angle
based_arrow_down
lr_angle
based_arrow_up
man
boat middlebutton
bogosity mouse
bottom_left_corner
pencil
bottom_right_corner
pirate
bottom_side
plus
bottom_tee
question_arrow
box_spiral
right_ptr
center_ptr
right_side
circle right_tee
clock rightbutton
coffee_mug
rtl_logo
cross sailboat
cross_reverse
sb_down_arrow
crosshair sb_h_double_arrow
diamond_cross
sb_left_arrow
dot sb_right_arrow
dotbox sb_up_arrow
double_arrow
sb_v_double_arrow
draft_large
shuttle
draft_small
sizing
draped_box
spider
exchange spraycan
fleur star
gobbler target
gumby tcross
hand1 top_left_arrow
hand2 top_left_corner
heart top_right_corner
icon top_side
iron_cross
left_ptr
left_side top_tee
left_tee trek
ul_angle umbrella
ur_angle watch
xterm
XmNmoveOpaque
Specifies whether an interactive operation that moves a win‐
dow, such as tearing off and dragging a tear-off menu or mov‐
ing a window in MWM, displays an outline of the window or a
representation of the window itself during the move. If the
value is True, the operation displays a representation of the
window during the move. If the value is False, the operation
displays an outline of the window.
XmNunpostBehavior
Specifies the behavior of an active menu posted in traversal
mode when a subsequent menu button selection is made outside
the posted menu. When the value is XmUNPOST_AND_REPLAY, the
resource unposts the menu hierarchy and causes the server to
replay the event to the window in which the pointer is
located. When the value is XmUNPOST, the resource unposts the
hierarchy without replaying the event.
XmNuseColorObject
Enables and disables the sharing of colors between widgets,
and the dynamic changing of colors. A value of False disables
this, and a value of True enables it.
XmNuserData
Allows the application to attach any necessary specific data
to the widget. This is an internally unused resource.
XmNverticalFontUnit
Specifies the vertical component of the font units used by
XmConvertUnits and used to interpret the values of geometry
resources when the XmNshellUnitType resource of VendorShell
or the XmNunitType resource of Gadget, Manager, or Primitive
has the value Xm100TH_FONT_UNITS. If no initial value is
supplied for this resource, the default is computed from the
font specified in XmNfont. If no initial value is supplied
for this resource or for XmNfont, the default is 10.
If a call to XtSetValues specifies a value for XmNvertical‐
FontUnit, this resource is set to that value. If a call to
XtSetValues specifies a value for XmNfont but not for XmNver‐
ticalFontUnit, this resource is set to a value computed from
the new XmNfont.
A vertical font unit is derived from a font as follows:
· If the font has a PIXEL_SIZE property, the vertical
font unit is the PIXEL_SIZE property divided by 1.8.
· If the font has no PIXEL_SIZE property but has
POINT_SIZE and RESOLUTION_Y properties, the vertical
font unit is the product of the POINT_SIZE and RESOLU‐
TION_Y properties divided by 1400.
· If the font has no PIXEL_SIZE, POINT_SIZE, or RESOLU‐
TION_Y properties, the vertical font unit is the sum of
the font structure's max_bounds.ascent and
max_bounds.descent divided by 2.2.
Inherited Resources
All of the superclass resources inherited by XmScreen are designated
N/A (not applicable).
RELATEDCore(3), XmDisplay(3), XmGetXmScreen(3), and XmSetMenuCursor(3),
XmScreen(library call)
