Class: UndoManager

PDFNet. UndoManager


new UndoManager()

The class UndoManager. Undo-redo interface; one-to-one mapped to document

Extends

Methods


canRedo()

Returns a boolean indicating whether it is possible to redo from the current snapshot.
Returns:
A promise that resolves to a boolean indicating whether it is possible to redo from the current snapshot.
Type
Promise.<boolean>

canUndo()

Returns whether it is possible to undo from the current snapshot.
Returns:
A promise that resolves to whether it is possible to undo from the current snapshot.
Type
Promise.<boolean>

destroy()

Destructor
Inherited From:
Returns:
Type
Promise.<void>

discardAllSnapshots()

Forget all changes in this manager (without changing the document).
Returns:
A promise that resolves to an invalid DocSnapshot.
Type
Promise.<PDFNet.DocSnapshot>

getNextRedoSnapshot()

Gets the next state of the document. This state may be invalid if it is impossible to redo.
Returns:
A promise that resolves to the next state of the document. This state may be invalid if it is impossible to redo.
Type
Promise.<PDFNet.DocSnapshot>

getNextUndoSnapshot()

Gets the previous state of the document. This state may be invalid if it is impossible to undo.
Returns:
A promise that resolves to the previous state of the document. This state may be invalid if it is impossible to undo.
Type
Promise.<PDFNet.DocSnapshot>

redo()

Restores to the next snapshot, if there is one.
Returns:
A promise that resolves to a representation of the transition to the next snapshot, if there is one.
Type
Promise.<PDFNet.ResultSnapshot>

takeOwnership()

Take the ownership of this object, so that PDFNet.runWithCleanup won't destroy this object.
Inherited From:
Returns:
Type
void

takeSnapshot()

Creates a snapshot of document state, transitions to the new snapshot.
Returns:
A promise that resolves to a representation of the transition.
Type
Promise.<PDFNet.ResultSnapshot>

undo()

Restores to the previous snapshot point, if there is one.
Returns:
A promise that resolves to the resulting snapshot id.
Type
Promise.<PDFNet.ResultSnapshot>