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#include <FXUndoList.h>
Public Member Functions | |
virtual void | undo ()=0 |
virtual void | redo ()=0 |
virtual FXuint | size () const |
virtual FXString | undoName () const |
virtual FXString | redoName () const |
virtual FXbool | canMerge () const |
virtual FXbool | mergeWith (FXCommand *command) |
virtual | ~FXCommand () |
Friends | |
class | FXUndoList |
class | FXCommandGroup |
Each undo records all the information necessary to undo as well as redo a given operation. Since commands are derived from FXObject, subclassed commands can both send and receive messages (like ID_GETINTVALUE, for example).
virtual FX::FXCommand::~FXCommand | ( | ) | [inline, virtual] |
Delete undo command.
virtual void FX::FXCommand::undo | ( | ) | [pure virtual] |
Undo this command; this should save the information for a subsequent redo.
Implemented in FX::FXCommandGroup, and FX::FXUndoList.
virtual void FX::FXCommand::redo | ( | ) | [pure virtual] |
Redo this command; this should save the information for a subsequent undo.
Implemented in FX::FXCommandGroup, and FX::FXUndoList.
virtual FXuint FX::FXCommand::size | ( | ) | const [virtual] |
Return the size of the information in the undo record.
The undo list may be trimmed to limit memory usage to a certain limit. The value returned should include the size of the command record itself as well as any data linked from it.
Reimplemented in FX::FXCommandGroup, and FX::FXUndoList.
virtual FXString FX::FXCommand::undoName | ( | ) | const [virtual] |
Name of the undo command to be shown on a button; for example, "Undo Delete".
Reimplemented in FX::FXUndoList.
virtual FXString FX::FXCommand::redoName | ( | ) | const [virtual] |
Name of the redo command to be shown on a button; for example, "Redo Delete".
Reimplemented in FX::FXUndoList.
virtual FXbool FX::FXCommand::canMerge | ( | ) | const [virtual] |
Return true if this command can be merged with previous undo commands.
This is useful to combine e.g. multiple consecutive single-character text changes into a single block change. The default implementation returns false.
Called by the undo system to try and merge the new incoming command with this command; should return true if merging was possible.
The default implementation returns false.
friend class FXUndoList [friend] |
Reimplemented in FX::FXCommandGroup.
friend class FXCommandGroup [friend] |
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