Undo methods for cell additions/deletions:

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

Functions
void	Worksheet::TreeUndo_ClearRedoActionList ()
	Clear the list of actions for which an undo can be undone.
void	Worksheet::TreeUndo_ClearUndoActionList ()
	Clear the list of actions for which undo can undo.
void	Worksheet::TreeUndo_AppendAction ()
	Add another action to this undo action.
void	Worksheet::TreeUndo_LimitUndoBuffer ()
	Drop actions from the back of the undo list until it is within the undo limit.
bool	Worksheet::TreeUndo (UndoActions *sourcelist, UndoActions *undoForThisOperation)
	Undo an item from a list of undo actions.
bool	Worksheet::TreeUndoTextChange (UndoActions *sourcelist, UndoActions *undoForThisOperation)
	Undo a text change.
bool	Worksheet::TreeUndoCellDeletion (UndoActions *sourcelist, UndoActions *undoForThisOperation)
	Undo a call deletion.
bool	Worksheet::TreeUndoCellAddition (UndoActions *sourcelist, UndoActions *undoForThisOperation)
	Undo adding cells.
bool	Worksheet::TreeUndo ()
	Undo a tree operation.
bool	Worksheet::TreeRedo ()
	Redo an undone tree operation.
bool	Worksheet::CanTreeUndo () const
	Can we undo a tree operation?
bool	Worksheet::CanTreeRedo () const
	Can we redo a tree operation?
void	Worksheet::TreeUndo_CellEntered ()
	The cursor has entered one cell => save the value to see if it has changed.
void	Worksheet::TreeUndo_CellLeft ()
	The cursor is about to leave the current cell => Store the change if the value has changed.
void	Worksheet::TreeUndo_MarkCellsAsAdded (GroupCell *start, GroupCell *end, UndoActions *undoBuffer)
	Remember that these cells were just added so this addition can be undone.
void	Worksheet::TreeUndo_MarkCellsAsAdded (GroupCell *parentOfStart, GroupCell *end)
	Remember that these cells were just added so this addition can be undone.

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 m_treeUndo.UndoStack() for normal deletes, m_treeUndo.RedoStack() 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.

Function Documentation

TreeUndo()

bool Worksheet::TreeUndo	(	UndoActions *	sourcelist,
		UndoActions *	undoForThisOperation
	)

Undo an item from a list of undo actions.

Parameters

sourcelist	The list to take the undo information from
undoForThisOperation	The list to write the information to how on to undo this undo op

TreeUndo_MarkCellsAsAdded() [1/2]

void Worksheet::TreeUndo_MarkCellsAsAdded	(	GroupCell *	parentOfStart,
		GroupCell *	end
	)

Remember that these cells were just added so this addition can be undone.

Parameters

parentOfStart	The cell after the first cell that has been added
end	The last cell that has been added

TreeUndo_MarkCellsAsAdded() [2/2]

void Worksheet::TreeUndo_MarkCellsAsAdded	(	GroupCell *	start,
		GroupCell *	end,
		UndoActions *	undoBuffer
	)

Remember that these cells were just added so this addition can be undone.

Parameters

start	The first cell that has been added
end	The last cell that has been added
undoBuffer	Where to store the undo information. This normally is m_treeUndo.UndoStack() for the normal undo buffer or m_treeUndo.RedoStack() for the buffer that allows reverting undos

TreeUndoCellAddition()

bool Worksheet::TreeUndoCellAddition	(	UndoActions *	sourcelist,
		UndoActions *	undoForThisOperation
	)

Undo adding cells.

Called from TreeUndo().

TreeUndoCellDeletion()

bool Worksheet::TreeUndoCellDeletion	(	UndoActions *	sourcelist,
		UndoActions *	undoForThisOperation
	)

Undo a call deletion.

Called from TreeUndo().

TreeUndoTextChange()

bool Worksheet::TreeUndoTextChange	(	UndoActions *	sourcelist,
		UndoActions *	undoForThisOperation
	)

Undo a text change.

Called from TreeUndo().