"

 COPYRIGHT (c) 1994 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.

"

    "Created: 20.11.1995 / 13:21:17 / cg"

SyncedMultiColumnTextView subclass:#TwoColumnTextView

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	category:'Views-Text'

!

!TwoColumnTextView class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1994 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.

"

    "Created: 20.11.1995 / 13:21:17 / cg"

!

documentation

"

    a view showing two texts side-by-side.

    Scrolling is synced, by always scrolling both views.

    This type of view is especially useful to show diff-lists,

    code-versions, or other one-by-one viewable texts.

    Usually, it does not make much sense, to put totally different

    or unrelated texts into this kind of view.

    See subclass DiffTextView for a real class;

    see ChangesBrowsers compare operation for a real application

    of this kind of views.

    [see also:]

        DiffTextView

        TextView EditTextView

    [author:]

        Claus Gittinger

"

    "Created: 20.11.1995 / 13:21:17 / cg"

!

examples

"

     TwoColumnTextView are currently not directly used by the system.

     However, it is used as an abstract superclass for DiffTextView.

     See more examples there.

     (you may find nice uses for it anyway ...)

                                                                        [exBegin]

     TwoColumnTextView

        openOn:('smalltalk.rc' asFilename contentsOfEntireFile)

        and:('display.rc' asFilename contentsOfEntireFile)

                                                                        [exEnd]

                                                                        [exBegin]

     TwoColumnTextView

        openOn:('display.rc' asFilename contentsOfEntireFile)

        and:('smalltalk.rc' asFilename contentsOfEntireFile)

                                                                        [exEnd]

                                                                        [exBegin]

     TwoColumnTextView

        openOn:('smalltalk.rc' asFilename contentsOfEntireFile)

        label:'smalltalk.rc'

        and:('display.rc' asFilename contentsOfEntireFile)

        label:'display.rc'

                                                                        [exEnd]

"

    "Created: 20.11.1995 / 13:21:42 / cg"

    "Modified: 20.11.1995 / 13:23:12 / cg"

! !

!TwoColumnTextView class methodsFor:'instance creation'!

openOn:firstText and:secondText

    "open up a view showing firstText and secondText side-by-side.

     This does not make much sense for unrelated texts - of course."

    |top v|

    top := StandardSystemView label:'two texts'.

    self openOn:firstText and:secondText in:top.

    ^ top open

    "

     TwoColumnTextView

        openOn:('smalltalk.rc' asFilename contentsOfEntireFile)

        and:('display.rc' asFilename contentsOfEntireFile)

     TwoColumnTextView

        openOn:('display.rc' asFilename contentsOfEntireFile)

        and:('smalltalk.rc' asFilename contentsOfEntireFile)

    "

    "Modified: 25.4.1996 / 13:31:03 / cg"

!

openOn:firstText and:secondText in:aView

    "open up a view showing firstText and secondText side-by-side.

     This does not make much sense for unrelated texts - of course."

    self openOn:firstText 

          label:nil

            and:secondText 

          label:nil

             in:aView.

!

openOn:firstText label:firstLabel and:secondText label:secondLabel

    "open up a view showing firstText and secondText side-by-side,

     and labels for both views.

     This does not make much sense for unrelated texts - of course."

    |top v l1 l2|

    top := StandardSystemView label:'two texts'.

    self openOn:firstText 

          label:firstLabel

            and:secondText 

          label:secondLabel

             in:top.

    ^ top open

    "

     TwoColumnTextView

        openOn:('smalltalk.rc' asFilename contentsOfEntireFile)

        label:'smalltalk.rc'

        and:('display.rc' asFilename contentsOfEntireFile)

        label:'display.rc'

    "

    "Modified: 15.8.1996 / 19:46:38 / cg"

!

openOn:firstText label:firstLabel and:secondText label:secondLabel in:aView

    "open up a view showing firstText and secondText side-by-side,

     and labels for both views.

     This does not make much sense for unrelated texts - of course."

    hvs := HVScrollableView 

               for:self 

               miniScrollerH:true miniScrollerV:false

               in:aView.

    scr := hvs scrolledView.

    (firstLabel notNil and:[secondLabel notNil]) ifTrue:[

        l1 := Label label:firstLabel in:aView.

        l1 origin:0.0@0.0 corner:0.5@(l1 height).

        l1 borderWidth:0.

        l2 := Label label:secondLabel in:aView.

        l2 origin:0.5@0.0 corner:1.0@(l1 height).

        l2 borderWidth:0.

        hvs origin:0.0 @ (l1 height + ViewSpacing) corner:1.0 @ 1.0.

    ] ifFalse:[

        hvs origin:0.0 @ 0.0  corner:1.0 @ 1.0

    ].

    scr text1:firstText text2:secondText.

    scr moveToNextChanged.

! !

!TwoColumnTextView class methodsFor:'specification'!

numberOfViews

    ^ 2

    "Created: 20.11.1995 / 13:17:00 / cg"

! !

!TwoColumnTextView methodsFor:'accessing'!

numberOfChanges

    |start numberOfChanges|

    textViews first contents size == textViews last contents size ifTrue: [^0].

    start := 1.

    numberOfChanges := 0.

    textViews do:[:v||list max lnNr|

        list := v list.

        max  := list size.

        lnNr := start.

        [(lnNr < max)] whileTrue: [

            (lnNr < max and: [ (list at: lnNr - 1 ifAbsent: [list at:1]) isText not and: [(list at:lnNr) isText]])

                ifTrue: [numberOfChanges := numberOfChanges + 1].

            lnNr := lnNr + 1

        ].

    ].

    ^numberOfChanges

!

text1:t1 text2:t2

    (textViews at:1) list:t1 asText.

    (textViews at:2) list:t2 asText.

    "Created: 20.11.1995 / 13:20:39 / cg"

! !

!TwoColumnTextView methodsFor:'actions'!

moveToLine:aLineNr

    |lnNr view nLinesShown|

    view := textViews at:1.

    view shown ifTrue:[

        lnNr := (view lastLineShown - view firstLineShown) // 3.

    ] ifFalse:[

        lnNr := 5.

    ].

    (lnNr := aLineNr - lnNr) < 1 ifTrue:[

        lnNr := 1

    ].

    self scrollToLine:lnNr.

!

moveToNextChanged

    |start end|

    start := ((textViews at:1) lastLineShown) + 1.

    textViews do:[:v||list max lnNr|

        list := v list.

        max  := list size.

        lnNr := start.

        [(lnNr > max or:[(list at:lnNr) isText])

        ] whileFalse:[

            lnNr := lnNr + 1

        ].

        (lnNr <= max) ifTrue:[

            (end isNil or:[lnNr < end]) ifTrue:[

                end := lnNr.

            ]

        ].

    ].

    end notNil ifTrue:[

        self moveToLine:end

    ].

!

moveToPreviousChanged

    |start end found|

    start := ((textViews at:1) firstLineShown) - 1.

    end   := 1.

    found := false.

    start > 1 ifTrue:[

        textViews do:[:v||lnNr list|

            list := v list.

            lnNr := list size.

            lnNr >= start ifTrue:[

                lnNr := start

            ].

            [(lnNr == end or:[(list at:lnNr) isText])

            ] whileFalse:[

                lnNr := lnNr - 1

            ].

            (list at:lnNr) isText ifTrue:[

                end   := lnNr.

                found := true

            ]

        ]

    ].

    found ifTrue:[

        self moveToLine:end

    ].

! !

!TwoColumnTextView class methodsFor:'documentation'!

version