Each EditorCell has its own private undo buffer Additionally wxMaxima maintains an undo buffer for worksheet changes. More...

Detailed Description

Each EditorCell has its own private undo buffer Additionally wxMaxima maintains an undo buffer for worksheet changes.

Delete the currently selected cells.

Move a range of cells from the document to the undo buffer.

Delete a range of cells.

Clear the undo and the redo buffer.

It works the following way:

Cells normally aren't deleted. They are moved into an undo buffer instead.
The undo buffer is also notified when Cells that are added
If the cursor enters a cell the contents of this cell is saved
And if the cell is left and the contents has changed this information is kept in the undo buffer, as well.

The add and delete actions offer to choose which undo buffer to use since there are two of them:

The normal undo buffer and
The buffer that is used instead if a cell change has been issued by the undo command so the undo action can be reverted.
This approach allows the undo functionality to use the regular add and delete operations keeping the codebase small.

Parameters

start	The first cell to delete
end	The last cell to delete
undoBuffer	The buffer the undo information has to be kept in. Might be treeUndoActions for normal deletes, treeRedoActions for deletions while executing an undo or NULL for: Don't keep any copy of the cells.

Parameters

start	The first cell to delete
end	The last cell to delete

Actually moves them to the undo buffer so this action can be undone.