glok-model/uk.co.nickthecoder.glok.history/ChangeImpl

ChangeImpl

interface ChangeImpl : Change

All concrete implementations of Change must also implement this. However, the public API must never expose this implementation, because undo and redo must only be called by History.

Properties

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abstract val document: HistoryDocument
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abstract val label: String

Functions

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open fun addToCurrentBatch()

Adds this Change to the current Batch.

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open fun canMergeWith(previous: Change): Boolean

When typing, lots of Change objects will be created. Undoing / redoing each character isn't what the user expects. So instead, Changes have the option to merge.

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open fun mergeWith(previous: Change)

Mutates previous, so that it also encompasses the changes in this.

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open fun now()

Begins a new Batch, applies this Change, and ends the Batch.

open fun now(label: String)

Begins a new Batch with the given label, applies this Change, and ends the Batch.

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abstract fun redo()
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abstract fun undo()