"

 COPYRIGHT (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.

"

"{ Package: 'stx:libwidg' }"

EditTextView subclass:#TextCollector

	instanceVariableNames:'entryStream lineLimit destroyAction outstandingLines

		outstandingLine flushBlock flushPending inFlush collecting

		timeDelay access currentEmphasis alwaysAppendAtEnd collectSize'

	classVariableNames:'TranscriptQuerySignal'

	poolDictionaries:''

	category:'Views-Text'

!

!TextCollector class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (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.

"

!

documentation

"

    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.

    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 ...

    [StyleSheet paramters (transcript only):]

        transcriptForegroundColor       defaults to textForegroundColor

        transcriptBackgroundColor'      defaults to textBackgroundColor.

        transcriptCursorForegroundColor

        transcriptCursorBackgroundColor

    [author:]

        Claus Gittinger

    [see also:]

        CodeView EditTextView

        ActorStream

"

! !

!TextCollector class methodsFor:'instance creation'!

initialize

    TranscriptQuerySignal := QuerySignal new.

!

newTranscript

    "create and open a new transcript.

     This is a leftOver method from times were the Launcher & Transcript

     were two different views. It is no longer recommended."

    |topView transcript defSz f v lines cols|

    topView := StandardSystemView label:'Transcript' "minExtent:(100 @ 100)".

    v := HVScrollableView for:self miniScrollerH:true miniScrollerV:false in:topView.

    v origin:(0.0 @ 0.0) corner:(1.0 @ 1.0).

    transcript := v scrolledView.

    "transcript partialLines:false."

    f := transcript font.

    "

     should add the height of the frame & scrollbars to be exact ...

    "

    defSz := self defaultTranscriptSize.

    cols := defSz x.

    lines := defSz y.

    topView extent:(((f widthOf:'x') * cols) @ (f height * lines)).

    transcript beTranscript.

    "

     run it at a slightly higher prio, to allow for

     delayed buffered updates to be performed

    "

    topView openWithPriority:(Processor userSchedulingPriority + 1).

    ^ transcript

    "

     TextCollector newTranscript.

     Transcript lineLimit:3000.

    "

    "Modified: 17.2.1997 / 18:20:27 / cg"

! !

!TextCollector class methodsFor:'Signal constants'!

transcriptQuerySignal

    ^ TranscriptQuerySignal

! !

!TextCollector class methodsFor:'defaults'!

defaultCollectSize

    "the number of lines buffered for delayed update"

    ^ 50

    "Modified: / 27.7.1998 / 16:14:51 / cg"

!

defaultLineLimit

    "the number of lines remembered by default"

    ^ 600

!

defaultTimeDelay

    "the time in seconds to wait & collect by default"

    ^ 0.3 

!

defaultTranscriptSize

    "the number of cols/lines by which the Transcript should come up"

    ^ 70@11

! !

!TextCollector methodsFor:'Compatibility - ST80'!

deselect

    self unselect

!

flush

    self endEntry.

    super flush

! !

!TextCollector methodsFor:'accessing'!

beginEntry

    "noop for now, ST80 compatibility"

    ^ self

    "Created: / 4.3.1998 / 11:08:14 / stefan"

!

collect:aBoolean

    "turn on/off collecting - if on, do not output immediately

     but collect text and output en-bloque after some time delta"

    collecting := aBoolean

!

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."

    collectSize := numberOfLines

    "Modified: / 27.7.1998 / 16:16:00 / cg"

!

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)"

    destroyAction := aBlock

!

endEntry

    "flush collected output; displaying all that has been buffered so far"

    |nLines lines|

    shown ifFalse:[

        "/ when iconified or not yet shown, keep

        "/ collecting. But not too much ...

        outstandingLines size < 300 ifTrue:[

            flushPending ifFalse:[

                self installDelayedUpdate.

            ].

            ^ self

        ]

    ].

    inFlush ifTrue:[^ self].

    flushBlock notNil ifTrue:[

        Processor removeTimedBlock:flushBlock.

    ].

    flushPending ifFalse:[^ self].

    access critical:[

        inFlush := true.

        [

            flushPending := false.

            outstandingLines size ~~ 0 ifTrue:[

                "insert the bunch of lines - if any"

                lines := outstandingLines.

                outstandingLines := nil.

                nLines := lines size.

                (nLines ~~ 0) ifTrue:[

                    insertMode ifTrue:[

                        self insertLines:lines withCR:true.

                    ] ifFalse:[

                        self replaceLines:lines withCR:true

                    ].

                    alwaysAppendAtEnd ifTrue:[

                        self cursorToEnd.

                    ].

                    (cursorLine >= (firstLineShown + nFullLinesShown)) ifTrue:[

                        self withCursorOffDo:[

                            self scrollDown:nLines

                        ]

                    ].

                ].

            ].

            "and the last partial line - if any"

            outstandingLine size > 0 ifTrue:[

                insertMode ifTrue:[

                    self insertStringAtCursor:outstandingLine.

                ] ifFalse:[

                    self replaceStringAtCursor:outstandingLine.

                ].

                outstandingLine := ''.

            ].

            self checkLineLimit.

            device flush.

        ] valueNowOrOnUnwindDo:[

            inFlush := false.

        ]

    ].

    flushPending ifTrue:[

        flushPending := false.

        self installDelayedUpdate

    ]

    "Modified: / 9.11.1998 / 21:17:56 / cg"

!

lineLimit

    "return the number of text-lines I am supposed to hold"

    ^ lineLimit

    "

     Transcript lineLimit:5000

     Transcript lineLimit

    "

    "Modified: / 16.5.1998 / 01:33:52 / cg"

!

lineLimit:aNumber

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

    lineLimit := aNumber

    "

     Transcript lineLimit:5000

    "

    "Modified: / 16.5.1998 / 01:33:52 / cg"

!

updateTimeDelay:seconds

    "if collect is enabled, the receiver will update its view, 

     after that time delay (i.e. it collects more output during that period),

     or when collectSize lines have been collected without update.

     With collect turned off, an immediate update is performed."

    timeDelay := seconds

    "Modified: / 27.7.1998 / 16:16:41 / cg"

! !

!TextCollector methodsFor:'change & update'!

getListFromModel

    "a textCollector always scrolls to the bottom"

     super getListFromModel.

"/ cg:

"/ now done by setting scrollWhenUpdating as appropriate

"/     self scrollToBottom

    "Created: 12.2.1996 / 14:27:56 / stefan"

    "Modified: 11.1.1997 / 14:41:50 / cg"

! !

!TextCollector methodsFor:'events'!

exposeX:x y:y width:w height:h

    "flush buffered text when exposed"

    super exposeX:x y:y width:w height:h.

    self endEntry

! !

!TextCollector methodsFor:'initialize / release'!

destroy

    "destroy this view"

    destroyAction notNil ifTrue:[

        destroyAction value

    ].

    flushBlock notNil ifTrue:[

        Processor removeTimedBlock:flushBlock.

    ].

    flushBlock := nil.

    outstandingLines := nil.

    outstandingLine := ''.

    super destroy

    "Modified: / 9.11.1998 / 21:18:17 / cg"

!

editMenu

    "return my popUpMenu; thats the superClasses menu,

     minus any accept item."

    <resource: #programMenu>

    |m idx|

    m := super editMenu.

    "

     textcollectors do not support #accept

     remove it from the menu (and the preceeding separating line)

    "

    idx := m indexOf:#accept.

    idx ~~ 0 ifTrue:[

        m remove:idx.

        (m labels at:(idx - 1)) = '-' ifTrue:[

            m remove:idx - 1

        ].

    ].

    ^ m

    "Modified: 3.7.1997 / 13:54:11 / cg"

!

initialize

    super initialize.

    scrollWhenUpdating := #endOfText.

    outstandingLines := nil.

    alwaysAppendAtEnd := true.

    collectSize := self class defaultCollectSize.

    flushPending := inFlush := false.

    collecting := true.

    timeDelay := self class defaultTimeDelay.

    access := RecursionLock new. "/ Semaphore forMutualExclusion.

    access name:'TextCollector access lock'.

    lineLimit := self class defaultLineLimit.

    entryStream := ActorStream new.

    entryStream nextPutBlock:[:something | self nextPut:something].

    entryStream nextPutAllBlock:[:something | self nextPutAll:something]

    "Modified: / 14.12.1999 / 21:13:54 / cg"

!

mapped

    "view became visible - show collected lines (if any)"

    super mapped.

    self endEntry

!

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"

    flushPending := false.

    access := RecursionLock new. "/ Semaphore forMutualExclusion.

    super reinitialize.

    "Modified: / 5.3.1998 / 10:09:14 / stefan"

! !

!TextCollector methodsFor:'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"

    lineLimit notNil ifTrue:[

    ]

!

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 ...)."

    |p|

    flushPending ifFalse:[

        flushPending := true.

        inFlush ifFalse:[

            "

             we could run under a process, which dies in the meantime;

             therefore, we have to arrange for the transcript process to

             be interrupted and do the update.

            "

            windowGroup isNil ifTrue:[

                p := Processor activeProcess

            ] ifFalse:[

                p := windowGroup process

            ].

            (p isNil or:[p isSystemProcess]) ifTrue:[

                self endEntry

            ] ifFalse:[

                flushBlock isNil ifTrue:[

                    flushBlock := [self endEntry].

                ].

                Processor addTimedBlock:flushBlock for:p afterSeconds:timeDelay.

            ]

        ]

    ]

    "Modified: / 17.4.1997 / 13:03:15 / stefan"

    "Modified: / 9.11.1998 / 14:34:07 / cg"

! !