Class: ThreeColumnTextView

• Inheritance
• Description
• Class protocol
  • instance creation
  • specification
• Instance protocol
  • accessing
• Examples

Inheritance:

   Object
   |
   +--GraphicsMedium
      |
      +--DisplaySurface
         |
         +--SimpleView
            |
            +--SyncedMultiColumnTextView
               |
               +--ThreeColumnTextView
                  |
                  +--Diff3TextView

Package:

stx:libwidg2

Category:

Views-Text

Version:

rev: 1.4 date: 2021/01/20 14:40:26

user: cg

file: ThreeColumnTextView.st directory: libwidg2

module: stx stc-classLibrary: libwidg2

Description:

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.

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.

Class protocol:

 openOn: firstText and: secondText and: thirdText

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

Usage example(s):

ThreeColumnTextView openOn:('smalltalk.rc' asFilename contentsOfEntireFile) and:('display.rc' asFilename contentsOfEntireFile) and:('private.rc' asFilename contentsOfEntireFile)

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

open up a view showing firstText, secondText and thirdText side-by-side,
and labels for all views.

Usage example(s):

ThreeColumnTextView openOn:('smalltalk.rc' asFilename contentsOfEntireFile) label:'smalltalk.rc' and:('display.rc' asFilename contentsOfEntireFile) label:'display.rc' and:('private.rc' asFilename contentsOfEntireFile) label:'private.rc'

 numberOfViews

(comment from inherited method)
return the number of the synced subViews.
Usually redefined in subclasses

Instance protocol:

 text1: t1 text2: t2 text3: t3

Examples:

ThreeColumnTextViews are currently not directly used by the system.
However, it is used as an abstract superclass for Diff3TextView.
See more examples there.
(you may find nice uses for it anyway ...)

ThreeColumnTextView
   openOn:('smalltalk.rc' asFilename contents)
   and:('display.rc' asFilename contents)
   and:('host.rc' asFilename contents)


ThreeColumnTextView
   openOn:('smalltalk.rc' asFilename contents)
   label:'smalltalk.rc'
   and:('display.rc' asFilename contents)
   label:'display.rc'
   and:('host.rc' asFilename contents)
   label:'host.rc'