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Document revision date: 19 July 1999
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OpenVMS RTL Screen Management (SMG$) Manual
SMG$BEGIN_DISPLAY_UPDATE
The Begin Batching of Display Updates routine saves, or batches, all
output to a virtual display until a matching call to
SMG$END_DISPLAY_UPDATE is encountered.
Format
SMG$BEGIN_DISPLAY_UPDATE display-id
RETURNS
| OpenVMS usage: |
cond_value |
| type: |
longword (unsigned) |
| access: |
write only |
| mechanism: |
by value |
Argument
display-id
| OpenVMS usage: |
identifier |
| type: |
longword (unsigned) |
| access: |
read only |
| mechanism: |
by reference |
Specifies the virtual display for which output is to be batched. The
display-id argument is the address of an unsigned
longword that contains the display identifier.
The display identifier is returned by SMG$CREATE_VIRTUAL_DISPLAY.
Description
SMG$BEGIN_DISPLAY_UPDATE lets you make more than one change to a
display and have the changes appear only after all changes are
complete. Thus, the user sees the display change from its initial state
to its final state, without seeing any of the intermediate states.
Batching terminates when SMG$END_DISPLAY_UPDATE has been called the
same number of times for a given display as has
SMG$BEGIN_DISPLAY_UPDATE. The Screen Management Facility keeps track of
batching for a given display; thus, the calls to the
SMG$BEGIN_DISPLAY_UPDATE and SMG$END_DISPLAY_UPDATE need not occur in
the same module.
Condition Values Returned
|
SS$_NORMAL
|
Normal successful completion.
|
|
SMG$_BATWAS_ON
|
Successful completion; batching has already been initiated.
|
|
SMG$_INVDIS_ID
|
Invalid
display-id.
|
|
SMG$_WRONUMARG
|
Wrong number of arguments.
|
SMG$BEGIN_PASTEBOARD_UPDATE
The Begin Batching of Pasteboard Updates routine saves, or batches, all
output to a pasteboard until a matching call to
SMG$END_PASTEBOARD_UPDATE is encountered.
Format
SMG$BEGIN_PASTEBOARD_UPDATE pasteboard-id
RETURNS
| OpenVMS usage: |
cond_value |
| type: |
longword (unsigned) |
| access: |
write only |
| mechanism: |
by value |
Argument
pasteboard-id
| OpenVMS usage: |
identifier |
| type: |
longword (unsigned) |
| access: |
read only |
| mechanism: |
by reference |
Specifies the pasteboard for which output is to be batched. The
pasteboard-id argument is the address of an unsigned
longword that contains the pasteboard identifier.
The pasteboard identifier is returned by SMG$CREATE_PASTEBOARD.
Description
SMG$BEGIN_PASTEBOARD_UPDATE lets you make more than one change to a
pasteboard and have the changes appear only after all changes are
complete. Thus, the user sees the pasteboard change from its initial
state to its final state, without seeing any of the intermediate states.
Batching terminates when SMG$END_PASTEBOARD_UPDATE has been called the
same number of times for a given pasteboard as has
SMG$BEGIN_PASTEBOARD_UPDATE. The Screen Management Facility keeps track
of batching for a given pasteboard; thus, the calls to the
SMG$BEGIN_PASTEBOARD_UPDATE and SMG$END_PASTEBOARD_UPDATE need not
occur in the same module.
Condition Values Returned
|
SS$_NORMAL
|
Normal successful completion.
|
|
SMG$_BATWAS_ON
|
Successful completion; batching has already been initiated.
|
|
SMG$_INVPAS_ID
|
Invalid
pasteboard-id.
|
|
SMG$_WRONUMARG
|
Wrong number of arguments.
|
SMG$CANCEL_INPUT
The Cancel Input Request routine immediately cancels any
read-in-progress that was issued by SMG$READ_COMPOSED_LINE,
SMG$READ_KEYSTROKE, SMG$READ_STRING, or SMG$READ_VERIFY.
Format
SMG$CANCEL_INPUT keyboard-id
RETURNS
| OpenVMS usage: |
cond_value |
| type: |
longword (unsigned) |
| access: |
write only |
| mechanism: |
by value |
Argument
keyboard-id
| OpenVMS usage: |
identifier |
| type: |
longword (unsigned) |
| access: |
read only |
| mechanism: |
by reference |
Specifies the virtual keyboard for which the input is to be canceled.
The keyboard-id argument is the address of an unsigned
longword that contains the keyboard identifier.
The keyboard identifier is returned by SMG$CREATE_VIRTUAL_KEYBOARD.
Description
SMG$CANCEL_INPUT causes immediate termination of an
SMG$READ_COMPOSED_LINE, SMG$READ_KEYSTROKE, SMG$READ_STRING, or
SMG$READ_VERIFY input operation from a terminal. The condition code
SS$_CANCEL or SS$_ABORT is returned to those routines when you use
SMG$CANCEL_INPUT. Note that if the specified virtual keyboard is
associated with an OpenVMS RMS file, this procedure has no effect
because it is not possible to cancel an outstanding RMS input operation.
Condition Values Returned
|
SS$_NORMAL
|
Normal successful completion.
|
|
SMG$_INVKBD_ID
|
Invalid
keyboard-id.
|
|
SMG$_WRONUMARG
|
Wrong number of arguments.
|
SMG$CHANGE_PBD_CHARACTERISTICS
The Change Pasteboard Characteristics routine lets you change the
characteristics associated with a pasteboard.
Format
SMG$CHANGE_PBD_CHARACTERISTICS pasteboard-id [,desired-width]
[,width] [,desired-height] [,height] [,desired-background-color]
[,background-color]
RETURNS
| OpenVMS usage: |
cond_value |
| type: |
longword (unsigned) |
| access: |
write only |
| mechanism: |
by value |
Arguments
pasteboard-id
| OpenVMS usage: |
identifier |
| type: |
longword (unsigned) |
| access: |
read only |
| mechanism: |
by reference |
Specifies the pasteboard whose characteristics are to be changed. The
pasteboard-id argument is the address of an unsigned
longword that contains the pasteboard identifier.
The pasteboard identifier is returned by SMG$CREATE_PASTEBOARD.
desired-width
| OpenVMS usage: |
longword_signed |
| type: |
longword (signed) |
| access: |
read only |
| mechanism: |
by reference |
New width for the pasteboard. The desired-width
argument is the address of a signed longword that contains the desired
width. If omitted, the width does not change.
width
| OpenVMS usage: |
longword_signed |
| type: |
longword (signed) |
| access: |
write only |
| mechanism: |
by reference |
Receives the physical width of the pasteboard. The
width argument is the address of a signed longword
into which is written the actual width of the pasteboard.
If the terminal cannot be set exactly to
desired-width, width may be larger
than desired-width. If the physical width of the
terminal is smaller than desired-width,
width may be smaller than
desired-width.
desired-height
| OpenVMS usage: |
longword_signed |
| type: |
longword (signed) |
| access: |
read only |
| mechanism: |
by reference |
New height for the pasteboard. The desired-height
argument is the address of a signed longword that contains the desired
height of the pasteboard. If desired-height is
omitted, the height does not change.
height
| OpenVMS usage: |
longword_signed |
| type: |
longword (signed) |
| access: |
write only |
| mechanism: |
by reference |
Receives the physical height of the pasteboard. The
height argument is the address of a signed longword
into which is written the actual height of the pasteboard.
If the terminal cannot be set exactly to
desired-height, height may be larger
than desired-height. If the physical height of the
terminal is smaller than desired-height,
height may be smaller than
desired-height.
desired-background-color
| OpenVMS usage: |
longword_unsigned |
| type: |
longword (unsigned) |
| access: |
read only |
| mechanism: |
by reference |
Symbolic name for the desired background color. The
desired-background-color argument is the address of an
unsigned longword that contains the desired color.
The symbols listed below are defined in $SMGDEF. Valid values for
desired-background-color are as follows:
|
SMG$C_COLOR_WHITE
|
Light background
|
|
SMG$C_COLOR_BLACK
|
Dark background
|
|
SMG$C_COLOR_BLUE
|
Blue background
|
|
SMG$C_COLOR_CYAN
|
Cyan (green-blue) background
|
|
SMG$C_COLOR_GREEN
|
Green background
|
|
SMG$C_COLOR_MAGENTA
|
Magenta background
|
|
SMG$C_COLOR_RED
|
Red background
|
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SMG$C_COLOR_YELLOW
|
Yellow background
|
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SMG$C_COLOR_LIGHT
|
White background
|
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SMG$C_COLOR_DARK
|
Black background
|
|
SMG$C_COLOR_USER1
|
User-defined background 1
|
|
SMG$C_COLOR_USER2
|
User-defined background 2
|
|
SMG$C_COLOR_USER3
|
User-defined background 3
|
|
SMG$C_COLOR_USER4
|
User-defined background 4
|
|
SMG$C_COLOR_USER5
|
User-defined background 5
|
|
SMG$C_COLOR_USER6
|
User-defined background 6
|
|
SMG$C_COLOR_USER7
|
User-defined background 7
|
|
SMG$C_COLOR_USER8
|
User-defined background 8
|
If you omit desired-background-color, or if the
terminal hardware does not support the background color specified, the
background color is not changed.
background-color
| OpenVMS usage: |
longword_unsigned |
| type: |
longword (unsigned) |
| access: |
write only |
| mechanism: |
by reference |
Receives the background color chosen. The
background-color argument is the address of an
unsigned longword into which is written the background color.
This routine may return any of the values listed in the
desired-background-color argument description or
SMG$C_COLOR_UNKNOWN. If the desired-background-color
argument is omitted, the value of background-color
does not change.
Description
SMG$CHANGE_PBD_CHARACTERISTICS lets you change the width, height, and
background color associated with a pasteboard.
If necessary, this routine will notify the OpenVMS operating system of
the change in pasteboard characteristics by updating the terminal
characteristics displayed when you enter the DCL command SHOW TERMINAL.
Do not use SMG$CHANGE_PBD_CHARACTERISTICS on a batched pasteboard.
Condition Values Returned
|
SS$_NORMAL
|
Normal successful completion.
|
|
SMG$_INVCOLARG
|
Unknown background color specified.
|
|
SMG$_INVPAGARG
|
Invalid height of 0 desired.
|
|
SMG$_INVWIDARG
|
Invalid width of 0 desired.
|
|
SMG$_PBDIN_USE
|
Cannot change characteristics while batching is on.
|
|
SMG$_WRONUMARG
|
Wrong number of arguments.
|
|
SS$_xxx
|
Any error from $QIOW.
|
SMG$CHANGE_RENDITION
The Change Default Rendition routine changes the video attributes for
all or part of a virtual display.
Format
SMG$CHANGE_RENDITION display-id ,start-row ,start-column
,number-of-rows ,number-of-columns [,rendition-set]
[,rendition-complement]
RETURNS
| OpenVMS usage: |
cond_value |
| type: |
longword (unsigned) |
| access: |
write only |
| mechanism: |
by value |
Arguments
display-id
| OpenVMS usage: |
identifier |
| type: |
longword (unsigned) |
| access: |
read only |
| mechanism: |
by reference |
Specifies the virtual display whose default rendition is to be changed.
The display-id argument is the address of an unsigned
longword that contains the display identifier.
The display identifier is returned by SMG$CREATE_VIRTUAL_DISPLAY.
start-row
| OpenVMS usage: |
longword_signed |
| type: |
longword (signed) |
| access: |
read only |
| mechanism: |
by reference |
Starting row position to receive the new rendition. The
start-row argument is the address of a signed longword
that contains the starting row number.
start-column
| OpenVMS usage: |
longword_signed |
| type: |
longword (signed) |
| access: |
read only |
| mechanism: |
by reference |
Starting column position to receive the new rendition. The
start-column argument is the address of a signed
longword that contains the starting column number.
number-of-rows
| OpenVMS usage: |
longword_signed |
| type: |
longword (signed) |
| access: |
read only |
| mechanism: |
by reference |
Number of rows to receive the new rendition. The
number-of-rows argument is the address of a signed
longword that contains the number of rows to be affected.
number-of-columns
| OpenVMS usage: |
longword_signed |
| type: |
longword (signed) |
| access: |
read only |
| mechanism: |
by reference |
Number of columns to receive the new rendition. The
number-of-columns argument is the address of a signed
longword that contains the number of columns to be affected.
rendition-set
| OpenVMS usage: |
mask_longword |
| type: |
longword (unsigned) |
| access: |
read only |
| mechanism: |
by reference |
Attribute specifier. The optional rendition-set
argument is the address of a longword bit mask in which each attribute
set causes the corresponding attribute to be set in the display. The
following attributes can be specified using the
rendition-set argument:
|
SMG$M_BLINK
|
Displays blinking characters.
|
|
SMG$M_BOLD
|
Displays characters in higher-than-normal intensity.
|
|
SMG$M_REVERSE
|
Displays characters in reverse video; that is, using the opposite of
the default rendition of the virtual display.
|
|
SMG$M_UNDERLINE
|
Displays underlined characters.
|
|
SMG$M_INVISIBLE
|
Specifies invisible characters; that is, the characters exist in the
virtual display but do not appear on the pasteboard.
|
SMG$M_USER1 through
SMG$M_USER8
|
Displays user-defined attributes.
|
The display-id argument must be specified when you use
the rendition-set argument.
rendition-complement
| OpenVMS usage: |
mask_longword |
| type: |
longword (unsigned) |
| access: |
read only |
| mechanism: |
by reference |
Attribute complement specifier. The optional
rendition-complement argument is the address of a
longword bit mask in which each attribute set causes the corresponding
attribute to be complemented in the display. All of the attributes that
can be specified with the rendition-set argument can
be complemented with the rendition-complement
argument. The display-id argument must be specified
when you use the rendition-complement argument.
The optional arguments rendition-set and
rendition-complement let the user control the
attributes of the virtual display. The rendition-set
argument sets certain virtual display attributes, while
rendition-complement complements these attributes. If
the same bit is specified in both the rendition-set
and rendition-complement parameters,
rendition-set is evaluated first, followed by
rendition-complement. By using these two parameters
together, the user can control each virtual display attribute in a
single procedure call. On a single-attribute basis, the user can cause
the following transformations:
| Set |
Complement |
Action |
|
0
|
0
|
Attribute set to default
|
|
1
|
0
|
Attribute on
|
|
0
|
1
|
Attribute set to complement of default setting
|
|
1
|
1
|
Attribute off
|
Description
This procedure changes the default video rendition of a rectangular
block of text already in the specified virtual display. For example,
you might use this procedure to redisplay a particular row in reverse
video.
Condition Values Returned
|
SS$_NORMAL
|
Normal successful completion.
|
|
SMG$_INVARG
|
Invalid number of rows, invalid number of columns, unrecognized
rendition-set code, or unrecognized
rendition-complement code.
|
|
SMG$_INVCOL
|
Invalid
start-column. The specified column is outside the
virtual display.
|
|
SMG$_INVDIS_ID
|
Invalid
display-id.
|
|
SMG$_INVROW
|
Invalid
start-row. The specified row is outside the virtual
display.
|
|
SMG$_NO_CHADIS
|
No change in virtual display.
|
|
SMG$_WRONUMARG
|
Wrong number of arguments.
|