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/* This file is part of the KDE project
Copyright (C) 2000 Werner Trobin <trobin@kde.org>
Copyright (C) 2000 David Faure <faure@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef kocommandhistory_h
#define kocommandhistory_h
#include <tqptrlist.h>
#include <tqstring.h>
#include <tqobject.h>
#include <koffice_export.h>
class KAction;
class KActionCollection;
class TQPopupMenu;
class KCommand;
#include <tqlistbox.h>
class KoListBox : public TQListBox {
Q_OBJECT
public:
KoListBox( TQWidget *parent = 0, const char *name = 0, WFlags f = 0 );
protected:
virtual void contentsMouseMoveEvent ( TQMouseEvent * );
virtual TQSize sizeHint() const;
signals:
void changeNumberOfSelectedItem( int );
};
/**
* The command history stores a (user) configurable amount of
* Commands. It keeps track of its size and deletes commands
* if it gets too large. The user can set a maximum undo and
* a maximum redo limit (e.g. max. 50 undo / 30 redo commands).
* The KoCommandHistory keeps track of the "borders" and deletes
* commands, if appropriate. It also activates/deactivates the
* undo/redo actions in the menu and changes the text according
* to the name of the command.
*
* @short History of user commands (for undo/redo)
*/
class KOFFICEUI_EXPORT KoCommandHistory : public TQObject {
Q_OBJECT
public:
/**
* Creates a command history, to store commands.
* This constructor doesn't create actions, so you need to call
* #undo and #redo yourself.
*/
KoCommandHistory();
/**
* Creates a command history, to store commands.
* This also creates an undo and a redo action, in the @p actionCollection,
* using the standard names ("edit_undo" and "edit_redo").
*
* @param actionCollection the collection to put the history in.
* @param withMenus if true, the actions will display a menu when plugged
* into a toolbar.
*/
KoCommandHistory(KActionCollection *actionCollection, bool withMenus = true);
/**
* Destructs the command history object.
*/
virtual ~KoCommandHistory();
/**
* Erases all the undo/redo history.
* Use this when reloading the data, for instance, since this invalidates
* all the commands.
*/
void clear();
/**
* Adds a command to the history. Call this for each @p command you create.
* Unless you set @p execute to false, this will also execute the command.
* This means, most of the application's code will look like:
*
* MyCommand * cmd = new MyCommand(i18n("The Name"), parameters);
* m_historyCommand.addCommand( cmd );
*/
void addCommand(KCommand *command, bool execute=true);
/**
* @return the maximum number of items in the undo history
*/
int undoLimit() const { return m_undoLimit; }
/**
* Sets the maximum number of items in the undo history.
*/
void setUndoLimit(int limit);
/**
* @return the maximum number of items in the redo history
*/
int redoLimit() const { return m_redoLimit; }
/**
* Sets the maximum number of items in the redo history.
*/
void setRedoLimit(int limit);
/**
* Enable or disable the undo and redo actions.
* This isn't usually necessary, but this method can be useful if
* you disable all actions (to go to a "readonly" state), and then
* want to come back to a readwrite mode.
*/
void updateActions();
/**
* @return the current top item on the history stack
*/
KCommand * presentCommand();
public slots:
/**
* Undoes the last action.
* Call this if you don't use the builtin KActions.
*/
virtual void undo();
/**
* Redoes the last undone action.
* Call this if you don't use the builtin KActions.
*/
virtual void redo();
/**
* Remembers when you saved the document.
* Call this right after saving the document. As soon as
* the history reaches the current index again (via some
* undo/redo operations) it will emit @ref documentRestored
* If you implemented undo/redo properly the document is
* the same you saved before.
*/
virtual void documentSaved();
protected slots:
void slotUndoAboutToShow();
void slotUndoActivated( int );
void slotRedoAboutToShow();
void slotRedoActivated( int );
void slotUndoActivated( TQListBoxItem *);
void slotRedoActivated( TQListBoxItem *);
void slotChangeRedoNumberOfSelectedItem( int );
void slotChangeUndoNumberOfSelectedItem( int );
signals:
/**
* Emitted every time a command is executed
* (whether by addCommand, undo or redo).
* You can use this to update the GUI, for instance.
*/
void commandExecuted();
/**
* Emitted every time a command is executed
* (whether by addCommand, undo or redo).
* You can use this to update the GUI, for instance.
* @param command was executed
*/
void commandExecuted(KCommand *cmd);
/**
* Emitted every time we reach the index where you
* saved the document for the last time. See @ref #documentSaved
*/
void documentRestored();
private:
void clipCommands(); // ensures that the limits are kept
TQPtrList<KCommand> m_commands;
KAction *m_undo, *m_redo;
TQPopupMenu *m_undoPopup, *m_redoPopup;
int m_undoLimit, m_redoLimit;
bool m_first; // attention: it's the first command in the list!
protected:
virtual void virtual_hook( int id, void* data );
private:
class KoCommandHistoryPrivate;
KoCommandHistoryPrivate *d;
};
#endif
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