Class OccUndoRedoController

Represents undo redo controller.

Constructors

constructor

Methods

add canRedo canUndo isBusy onBeforeChange onChange redo reset setBusy setMaxLength undo viewer

Constructors

constructor

  • new OccUndoRedoController(
        theViewer: OccViewer,
        theMaxLength?: number,
        theOnChange?: null | () => void,
    ): OccUndoRedoController

  • Constructor.

    Parameters

    • theViewer: OccViewer
    • theMaxLength: number = 100

      length of states to remember (-1 is unlimited)

    • theOnChange: null | () => void = null

      callback on change states of undo/redo service

    Returns OccUndoRedoController

Methods

add

canRedo

  • canRedo(): boolean

  • Check if can redo.

    Returns boolean

    can redo status

canUndo

  • canUndo(): boolean

  • Check if can undo.

    Returns boolean

    can undo status

isBusy

  • isBusy(): boolean

  • Check busy status.

    Returns boolean

    is busy status

onBeforeChange

  • onBeforeChange(): Observable

  • Return on before change state observable

    Returns Observable

    onBeforeChange observable

onChange

redo

  • redo(): boolean

  • Make redo if can.

    Returns boolean

    true if redo happened

reset

  • reset(): void

  • Reset states.

    Returns void

setBusy

  • setBusy(theBusy: boolean): void

  • Set busy status (disallow undo/redo if true).

    Parameters

    • theBusy: boolean

      the busy status

    Returns void

setMaxLength

  • setMaxLength(theMaxLength: number): void

  • Set max length and resets states array.

    Parameters

    • theMaxLength: number

      length of states to remember (-1 is unlimited)

    Returns void

undo

  • undo(): boolean

  • Make und if can.

    Returns boolean

    true if undo happened

viewer

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