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Object subclass:#UndoHistory
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instanceVariableNames:'history transaction enabled modifiedAction'
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classVariableNames:''
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poolDictionaries:''
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privateIn:UIObjectView
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!
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!UIObjectView::UndoHistory class methodsFor:'instance creation'!
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new
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^ self basicNew initialize
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! !
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!UIObjectView::UndoHistory class methodsFor:'constants'!
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maxHistorySize
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"returns maximum size of history before removing oldest
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record
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"
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^ 50
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! !
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!UIObjectView::UndoHistory methodsFor:'accessing'!
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modifiedAction:aBlockWithOneArg
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"the block is evaluated whenever the history changed; the argument to the
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block is the newest transaction identifier retrived from 'openTransaction'
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"
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modifiedAction := aBlockWithOneArg
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! !
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!UIObjectView::UndoHistory methodsFor:'initialization'!
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initialize
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super initialize.
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self reinitialize.
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!
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reinitialize
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"reinitialize all attributes
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"
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history := OrderedCollection new.
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transaction := nil.
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enabled := true.
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! !
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!UIObjectView::UndoHistory methodsFor:'notifications'!
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modified
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"raise notification; history changed
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"
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modifiedAction notNil ifTrue:[
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|what|
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history isEmpty ifTrue:[what := nil]
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ifFalse:[what := history last first].
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modifiedAction value:what
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]
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! !
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!UIObjectView::UndoHistory methodsFor:'testing'!
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isEmpty
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"returns true if undo history is empty
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"
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^ history isEmpty
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!
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isTransactionOpen
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^ (enabled and:[transaction notNil])
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!
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notEmpty
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"returns true if undo history is not empty
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"
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^ history notEmpty
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! !
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!UIObjectView::UndoHistory methodsFor:'transaction'!
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addUndoBlock:anUndoBlock
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"undo block to restore changes; add block to current transaction
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"
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enabled ifTrue:[
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transaction isNil ifTrue:[
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"no existing transaction
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"
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self halt
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] ifFalse:[
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(transaction at:2) add:anUndoBlock
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]
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]
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!
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closeTransaction
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"close current transaction
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"
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self isTransactionOpen ifTrue:[
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transaction last isEmpty ifTrue:[
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"empty undo transaction
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"
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transaction := nil
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] ifFalse:[
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history addLast:transaction.
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transaction := nil.
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history size > (self class maxHistorySize) ifTrue:[
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history removeFirst
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].
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self modified
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]
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]
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!
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disabledTransitionDo:aBlock
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"disable transitions during evaluating the block
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"
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|oldState|
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oldState := enabled.
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enabled := false.
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aBlock value.
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enabled := oldState.
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!
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openTransaction:what
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"open a new transaction
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"
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enabled ifTrue:[
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transaction notNil ifTrue:[
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"transaction within transaction
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"
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self halt.
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] ifFalse:[
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transaction := Array with:what with:OrderedCollection new
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]
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]
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!
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transactionNamed:what do:aBlock
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"open a transaction; perform the block; at least close the transaction
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"
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self isTransactionOpen ifFalse:[
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self openTransaction:what.
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aBlock value.
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self closeTransaction
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] ifTrue:[
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aBlock value
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]
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! !
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!UIObjectView::UndoHistory methodsFor:'undo'!
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undoLast
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"undo last transactions; an open transaction will be closed;
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transactions during undo are disabled
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"
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self undoLast:1
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!
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undoLast:nTransactions
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"undo last n transactions; an open transaction will be closed;
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transactions during undo are disabled
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"
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|actions n|
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transaction := nil.
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n := nTransactions min:(history size).
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n ~~ 0 ifTrue:[
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enabled := false.
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n timesRepeat:[
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actions := (history removeLast) last.
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actions reverseDo:[:aUndoBlock|
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aUndoBlock value
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]
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].
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enabled := true.
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self modified.
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]
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! !
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