Smalltalk/X Webserver

Documentation of class 'TextCollector':

Class: TextCollector

Inheritance
Description
Class protocol
Instance protocol
Private classes

Inheritance:

   Object
   |
   +--GraphicsMedium
      |
      +--DisplaySurface
         |
         +--SimpleView
            |
            +--View
               |
               +--ListView
                  |
                  +--TextView
                     |
                     +--EditTextView
                        |
                        +--TextCollector
                           |
                           +--TerminalView
                           |
                           +--Workspace

Package:: stx:libwidg

Category:: Views-Text

Version:: rev: 1.212 date: 2024/03/27 16:55:01; user: alkurz; file: TextCollector.st directory: libwidg; module: stx stc-classLibrary: libwidg

Description:

a view for editable text, which also understands some stream messages.
Instances of this view can take the place of a stream and display the 
received text.
Its main use in the system is the Transcript, but it can also be used for
things like trace-windows, errorLogs etc. 
(i.e. any view into which text is generated by stream-like messages)
It is also inherited by TerminalView, which especially uses the buffering and
delayed output features for higher performance output (compare to a Windows console).

If collecting is turned on, a textcollector will not immediately display 
entered text, but wait for some short time (timeDelay) and collect incoming 
data - finally updating the whole chunk in one piece. 
This helps slow display devices, which would otherwise scroll a lot. 
(on fast displays this is less of a problem).

The total number of lines kept is controlled by lineLimit, if more lines 
than this limit are added at the bottom, the textcollector will forget lines 
at the top. You can set linelimit to nil (i.e. no limit), but you may need a lot 
of memory then ...

You can force the buffered text to be flushed with #endEndtry.

[StyleSheet paramters (transcript only):]

    transcriptForegroundColor       defaults to textForegroundColor
    transcriptBackgroundColor'      defaults to textBackgroundColor.

    transcriptCursorForegroundColor
    transcriptCursorBackgroundColor

copyrightCOPYRIGHT (c) 1989 by Claus Gittinger
             All Rights Reserved

This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice.   This software may not
be provided or otherwise made available to, or used by, any
other person.  No title to or ownership of the software is
hereby transferred.

create and open a new transcript, unless one already exists by that name.
The transcript is remembered in a global by that name.
This is a leftOver method from times were the Launcher & Transcript
were two different views. It is no longer recommended.

Usage example(s):

     TextCollector newTranscript:#T2.
     T2 showCR:'Hello world'.
     Smalltalk removeKey:#T2

Instance protocol:

Compatibility-ST80

deselect: (comment from inherited method)
remove the selection

accessing

autoRaise

autoRaise: something

collect: aBoolean

turn on/off collecting - if on, do not output immediately
but collect text and output en-bloque after some time delta

collectSize: numberOfLines

set the collect buffer size. If collect is enabled,
the receiver will force update of the view,
whenever that many lines have been collected
(or the updateTimeDelay interval has passed).
With collect turned off, an immediate update is performed.

destroyAction: aBlock

define the action to be performed when I get destroyed.
This is a special feature, to allow resetting Transcript to Stderr
when closed. (see TextCollectorclass>>newTranscript)

entryStream

returns something which is a stream, sending its input to me.
Typically, this will be an ActorStream

entryStream: aStream

changes the entryStream.
This is the stream which gets all of my lines via nextPut/nextPutLine/nextPutAll.
Can be changed to (temporarily) divert the output to some file
and/or to duplicate (send to multiple destinations) via a splitter or filterStream.
(see example in SplittingWriteStream)

lineLimit

return the number of text-lines I am supposed to hold when collecting.
Nil means: unlimited

Usage example(s):

     Transcript lineLimit:5000
     Transcript lineLimit

lineLimit: aNumber

define the number of text-lines I am supposed to hold

Usage example(s):

     Transcript lineLimit:5000

updateTimeDelay: seconds

if collect is enabled, the receiver will update its view,
after that time delay (i.e. it collects output during that period),
or when collectSize lines have been collected without update.
With collect turned off, an immediate update is performed.

initialization & release

destroy: destroy this view
initialize: we always use unicode internally
mapped: view became visible - show collected lines (if any)
reinitialize: reinit after a snapIn.
recreate access-semaphore; image could have been save (theoretically)
with the semaphore locked - in this case, we had a deadlock
release

menu - actions

doSetLineLimit: ask for a new line limit (= number of buffered & remembered lines)
isDivertingOutput: is the output currently being diverted to a file?
startDivertingOutput: ask for a filename to divert (i.e. send) the output to
startDivertingOutputTo: aFilename: divert (i.e. send) the output to the given logFile
stopDivertingOutput: no longer send the output to the logFile (see startDivertingOutput)

printing

classDisplayString: (comment from inherited method)
used by walkbacks and inspectors;
same as self class displayString for smalltalk objects;
redefinable for proxy objects to not display the className of the proxy,
but the classname of the remote object (-> JavaObject)

private

checkLineLimit: this method checks if the text has become too large (> lineLimit)
and cuts off some lines at the top if so; it must be called whenever lines
have been added to the bottom
installDelayedUpdate: arrange for collecting input for some time,
and output all buffered strings at once after a while.
This makes output to the transcript much faster on systems
with poor scrolling performance (i.e. dumb vga cards ...).
senderTraceString: generate a sender trace string.

queries

canDivertOutput

current

return the current (your screen's) transcript.
In multiDisplay applications, this need NOT be the main transcript,
as each display may have its own transcript.
But typically, this is the same as Transcript.

Usage example(s):

     Transcript current flash

isStream

if I am the Transcript, I am used as a stream.
See #displayOn:

Usage example(s):

        Transcript isStream

isTextCollector

true, iff this is a text collector emulating a stream

Usage example(s):

     Transcript isTextCollector

position

for compatibiliy with normal streams; return the column

showLineLimitInMenu

scrolling

makeCursorVisible: must check again because of possible raise
scrollLock: aBoolean
scrollTo: anOrigin redraw: doRedraw: (comment from inherited method)
change origin to have newOrigin be visible at the top-left.
The argument defines the integer device coordinates of the new top-left
point.

stream messages

addLine: lineIn

append a line to the outstanding lines buffer

binary: beBinaryBool

ExternalStream protocol compatibility

bufferSizeForBulkCopy

buffered: aBoolean

ignored here

cr

output a carriage return, finishing the current line

Usage example(s):

self ~~ Transcript ifTrue:['xc' printCR].

display: someObject

dolphin compatibility.
and also sent by displayOn:

doesNotUnderstand: aMessage

this is funny: all message we do not understand, are passed
on to the stream which will send the characters via nextPut:
This way, we understand all Stream messages - great isn't it!

Usage example(s):

^ super doesNotUnderstand:aMessage

encoding

ensureCr

if the output position is not already at the beginning of a line,
output a carriage return

flush

write out all buffered data

format: formatSpec with: args

convenient formatted printing:
%1..%9 - positional parameters from args-collection
%(name) - named parameter from args-dictionary
%% - escape for %
%<cr> - cr (also tab, nl)

Usage example(s):

     1 to: 10 do:[:i |
        Transcript 
            format:'[%1] Hello %2 World - this is %3%' 
            with:{i . 'my' . 'nice'}
     ].

lineLength

to make a textCollector (somewhat) compatible with printer
streams, support the lineLength query

nextPut: something

append somethings printString to my displayed text.
Answer something.
This allows TextCollectors to be used Stream-wise

nextPutAll: something

append all of something to my displayed text.
This allows TextCollectors to be used Stream-wise

nextPutAll: count from: buffer startingAt: initialPosition

append count characters from buffer starting at initialPosition to my displayed text.
Answer the number of elements that were appended.
This allows TextCollectors to be used Stream-wise

printf: formatSpec

convenient C-style formatted printing.
For smalltalk specific formats,
see documentation in PrintfScanf >> format_printf

Usage example(s):

     1 to: 10 do:[:i |
        Transcript printf:'Hello World\n'
     ].

printf: formatSpec arguments: args

convenient C-style formatted printing with an arbitrary number of arguments.
Same as printf:withAll:, for protocol completeness.
For smalltalk specific formats,
see documentation in PrintfScanf >> format_printf

Usage example(s):

     1 to: 10 do:[:i |
        Transcript 
            printf:'[%d] Hello %s World - this is %s\n' 
            with:{i . 'my' . 'nice'}
     ].

printf: formatSpec with: arg1

convenient C-style formatted printing with 1 argument.
For smalltalk specific formats,
see documentation in PrintfScanf >> format_printf

Usage example(s):

     1 to: 10 do:[:i |
        Transcript printf:'[%d] Hello World\n' with:i
     ].

printf: formatSpec with: arg1 with: arg2

convenient C-style formatted printing with 2 arguments.
For smalltalk specific formats,
see documentation in PrintfScanf >> format_printf

Usage example(s):

     1 to: 10 do:[:i |
        Transcript 
            printf:'[%d] Hello World\n' with:i
     ].

printf: formatSpec with: arg1 with: arg2 with: arg3

convenient C-style formatted printing with 3 arguments.
For smalltalk specific formats,
see documentation in PrintfScanf >> format_printf

Usage example(s):

     1 to: 10 do:[:i |
        Transcript 
            printf:'[%d] Hello World\n' with:i
     ].

printf: formatSpec with: arg1 with: arg2 with: arg3 with: arg4

convenient C-style formatted printing.
For smalltalk specific formats,
see documentation in PrintfScanf >> format_printf

Usage example(s):

     1 to: 10 do:[:i |
        Transcript 
            printf:'[%d] Hello World\n' with:i
     ].

printf: formatSpec with: arg1 with: arg2 with: arg3 with: arg4 with: arg5

convenient C-style formatted printing.
For smalltalk specific formats,
see documentation in PrintfScanf >> format_printf

Usage example(s):

     1 to: 10 do:[:i |
        Transcript 
            printf:'[%d] Hello World\n' with:i
     ].

printf: formatSpec withAll: args

convenient C-style formatted printing with an arbitrary number of arguments.
For smalltalk specific formats,
see documentation in PrintfScanf >> format_printf

Usage example(s):

     1 to: 10 do:[:i |
        Transcript 
            printf:'[%d] Hello %s World - this is %s\n' 
            with:{i . 'my' . 'nice'}
     ].

println

for those used to Java/Javascript, a compatibility message.
Most useful inside expecco

println: anObject

for those used to Java/Javascript, a compatibility message.
Most useful inside expecco

show: anObject

insert the argument aString at the current cursor position.
Ignores the currentEmphasis setting.

showCR: anObject

insert the argument aString at the current cursor position,
and advance to the next line.
This is the same as a #show: followed by a #cr.
Ignores the currentEmphasis setting.

space

tab

append a tab-character to the stream.
This is only allowed, if the receiver supports writing.

stream messages-emphasis

bgColor: aColorOrNil

followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered with background color in aColorOrNil.
Does not affect show/showCR

bold

switch to bold
followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered in a bold font.
Does not affect show/showCR

Usage example(s):

     Transcript 
        nextPutAll:'hello';
        bold;
        nextPutAll:' world';
        notBold;
        nextPutLine:' again'

color: aColorOrNil

switch color
followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered in aColorOrNil.
Does not affect show/showCR

Usage example(s):

     Transcript 
        nextPutAll:'hello';
        color:Color red;
        nextPutAll:' world';
        color:nil;
        nextPutLine:' again'

emphasis: anEmphasisCollectionOrNil

change emphasis
followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered with anEmphasisCollectionOrNil.
Does not affect show/showCR

Usage example(s):

     Transcript 
        nextPutAll:'hello ';
        emphasis:#( bold underline );
        nextPutAll:'world';
        emphasis:nil;
        nextPutLine:' again'

italic

switch to italic
followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered in an italic font.
Does not affect show/showCR

normal

switch back to normal
followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered in the default font without color

notBold

switch to non-bold
followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered in a non-bold font.
Does not affect show/showCR

notItalic

switch to non-italic
followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered in a non-italic font.
Does not affect show/showCR

notReverse

switch back default colors

notUnderline

switch to non-underline
followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered without underline.
Does not affect show/showCR

reverse

switch to reverse
followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered with reversed colors.
Does not affect show/showCR

underline

switch to underline
followup characters sent with stream messages (nextPut/nextPutAll)
will be rendered with underline.
Does not affect show/showCR

transcript specials

assertEndEntry: assert there is no pending collected output
beTranscript: make the receiver be the systemTranscript; this one
is accessible via the global Transcript and gets relevant
system messages from various places.
beTranscript: name: make the receiver be the systemTranscript; this one
is accessible via the global Transcript and gets relevant
system messages from various places.
beginEntry: noop for now, ST80 compatibility
clear: Transcript clear
delayedEndEntry: flush collected output; displaying all that has been buffered so far
endEntry: flush collected output; displaying all that has been buffered so far
flash: make sure everything is visible, before flashing
flash: messageOrNil withColor: flashColor: make sure everything is visible, before flashing

Private classes:

    TranscriptFilterQuery

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Smalltalk/X Webserver

Documentation of class 'TextCollector':

Class: TextCollector

Inheritance:

Description:

copyright

Class protocol:

Instance protocol:

Private classes: