"

 COPYRIGHT (c) 2006 by eXept Software AG

              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:libtool' }"

"{ NameSpace: Tools }"

Object subclass:#NavigationHistory

!

!NavigationHistory class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 2006 by eXept Software AG

              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

"

    two variants:

        a forward-backward history, as in a browser:

            navigating backward moves a pointer in a list

        a global history

            navigating moves the navigated item to the front position

    hack: configurable to behave either as a global history

          or as a local-tab navigation history.

    Also implement backward compatible list-style acccess interface,

    to support old browsers (I guess, this is temporary and the other 

    users of the global history (debugger, old systembrowser etc. should

    be changed)

"

! !

!NavigationHistory class methodsFor:'instance creation'!

new

    ^ self basicNew initialize.

    "Created: / 21-02-2008 / 15:26:05 / janfrog"

! !

!NavigationHistory methodsFor:'accessing'!

currentItem

    ^(position between:1 and: items size) 

        ifTrue:[items at: position]

        ifFalse:[nil]

    "Created: / 27-02-2008 / 08:46:37 / janfrog"

!

currentItem: anObject

    self goTo: anObject

    "Created: / 27-02-2008 / 08:47:04 / janfrog"

!

goBackItems

    isGlobalHistory ifTrue:[^ items isEmpty ifTrue:[items] ifFalse:[items copyFrom:2]].

    ^ (items copyTo:position - 1) reverse

    "Created: / 27-02-2008 / 11:52:12 / janfrog"

    "Modified: / 03-07-2011 / 16:03:52 / cg"

!

goForwardItems

    isGlobalHistory ifTrue:[^ #()].

    ^ items copyFrom:position + 1

    "Created: / 27-02-2008 / 11:52:26 / janfrog"

    "Modified: / 03-07-2011 / 16:00:45 / cg"

! !

!NavigationHistory methodsFor:'backward list compatibility'!

addFirst:anEntry

    "Created: / 03-07-2011 / 13:26:48 / cg"

!

collect:aBlock thenSelect:filter

    ^ items collect:aBlock thenSelect:filter

    "Created: / 03-07-2011 / 13:34:14 / cg"

!

detect:aBlock ifNone:exeptionalValue

    ^ items detect:aBlock ifNone:exeptionalValue

    "Created: / 03-07-2011 / 13:25:37 / cg"

!

removeIdentical:anEntry

    "Created: / 03-07-2011 / 13:27:34 / cg"

! !

!NavigationHistory methodsFor:'initialization'!

beGlobalHistory

    isGlobalHistory := true

    "Created: / 03-07-2011 / 14:42:57 / cg"

!

initialize

    "Invoked when a new instance is created."

    "/ please change as required (and remove this comment)

    "/ items := nil.

    "/ position := nil.

    "/ super initialize.   -- commented since inherited method does nothing

    items := OrderedCollection new.

    position := 0.

    isGlobalHistory := false.

    "Created: / 21-02-2008 / 15:26:05 / janfrog"

    "Modified: / 03-07-2011 / 14:43:08 / cg"

! !

!NavigationHistory methodsFor:'menu & menu actions'!

goBackMenu

    |menu|

    menu := Menu new.

    self goBackItems do:[:item | 

        menu addItem:(MenuItem label:item displayString value:[ self goTo:item ])

    ].

    ^ menu

    "Created: / 22-02-2008 / 16:57:46 / janfrog"

    "Modified: / 27-02-2008 / 11:52:12 / janfrog"

!

goForwardMenu

    |menu|

    menu := Menu new.

    self goForwardItems do:[:item | 

        menu addItem:(MenuItem label:item displayString value:[ self goTo:item ])

    ].

    ^ menu

    "Created: / 22-02-2008 / 16:58:11 / janfrog"

    "Modified: / 27-02-2008 / 11:52:26 / janfrog"

! !

!NavigationHistory methodsFor:'navigation'!

goBack

    | value |

    isGlobalHistory ifTrue:[

        items size <= 1 ifTrue:[^ nil].

        ^ self goTo:(items second).

    ].

    position := (position - 1) max: 1.

    self changed: #currentItem with: (value := self currentItem).

    ^value

    "Created: / 21-02-2008 / 16:37:37 / janfrog"

    "Modified: / 27-02-2008 / 08:48:14 / janfrog"

    "Modified: / 03-07-2011 / 16:19:27 / cg"

!

goForward

    position := (position + 1) min: items size.

    self changed: #currentItem with: (value := self currentItem).

    ^value

    "Created: / 21-02-2008 / 16:37:37 / janfrog"

    "Modified: / 27-02-2008 / 08:48:24 / janfrog"

!

goTo: navigationHistoryItem

    | idx |

    idx := items indexOf:navigationHistoryItem.

    isGlobalHistory ifTrue:[

        idx ~~ 0 ifTrue:[

            items removeIndex:idx.

        ].

        items addFirst:navigationHistoryItem.

    ].

    self changed: #value with: navigationHistoryItem.

    "Created: / 21-02-2008 / 16:40:39 / janfrog"

    "Modified: / 21-02-2008 / 19:12:35 / janfrog"

    "Modified: / 03-07-2011 / 16:03:11 / cg"

! !

!NavigationHistory methodsFor:'queries'!

canGoBack

    ^position > 1

    "Created: / 21-02-2008 / 16:40:48 / janfrog"

!

canGoForward

    ^position < items size

    "Created: / 21-02-2008 / 16:40:48 / janfrog"

! !

!NavigationHistory class methodsFor:'documentation'!

version_CVS

!

version_CVS_jvrany

    ^ '§Header: /opt/data/cvs/stx/goodies/libtool3/Tools__NavigationHistory.st,v 1.2 2008-02-27 13:45:21 vranyj1 Exp §'

!

version_SVN

    ^ '§Id: Tools__NavigationHistory.st 7486 2009-10-26 22:06:24Z vranyj1 §'

! !