Chris@16: /* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */
Chris@16: 
Chris@16: /*
Chris@16:     A waveform viewer and audio annotation editor.
Chris@16:     Chris Cannam, Queen Mary University of London, 2005-2006
Chris@16:     
Chris@16:     This is experimental software.  Not for distribution.
Chris@16: */
Chris@16: 
Chris@16: /*
Chris@16:    This is a modified version of a source file from the Rosegarden
Chris@16:    MIDI and audio sequencer and notation editor, copyright 2000-2006
Chris@16:    Chris Cannam, distributed under the GNU General Public License.
Chris@16: 
Chris@16:    This file contains traces of the KCommandHistory class from the KDE
Chris@16:    project, copyright 2000 Werner Trobin and David Faure and
Chris@16:    distributed under the GNU Lesser General Public License.
Chris@16: */
Chris@16: 
Chris@17: #include "CommandHistory.h"
Chris@16: 
Chris@16: #include "Command.h"
Chris@16: 
Chris@16: #include <QRegExp>
Chris@16: #include <QMenu>
Chris@16: #include <QToolBar>
Chris@16: #include <QString>
Chris@16: 
Chris@16: #include <iostream>
Chris@16: 
Chris@17: CommandHistory *CommandHistory::m_instance = 0;
Chris@17: 
Chris@17: CommandHistory::CommandHistory() :
Chris@16:     m_undoLimit(50),
Chris@16:     m_redoLimit(50),
Chris@16:     m_savedAt(0)
Chris@16: {
Chris@16:     m_undoAction = new QAction(QIcon(":/icons/undo.png"), tr("&Undo"), this);
Chris@16:     m_undoAction->setShortcut(tr("Ctrl+Z"));
Chris@16:     connect(m_undoAction, SIGNAL(triggered()), this, SLOT(undo()));
Chris@16:     
Chris@17:     m_undoMenuAction = new QAction(QIcon(":/icons/undo.png"), tr("&Undo"), this);
Chris@17:     connect(m_undoMenuAction, SIGNAL(triggered()), this, SLOT(undo()));
Chris@17:     
Chris@16:     m_undoMenu = new QMenu(tr("&Undo"));
Chris@17:     m_undoMenuAction->setMenu(m_undoMenu);
Chris@16:     connect(m_undoMenu, SIGNAL(triggered(QAction *)),
Chris@16: 	    this, SLOT(undoActivated(QAction*)));
Chris@16: 
Chris@17:     m_redoAction = new QAction(QIcon(":/icons/redo.png"), tr("Re&do"), this);
Chris@16:     m_redoAction->setShortcut(tr("Ctrl+Shift+Z"));
Chris@16:     connect(m_redoAction, SIGNAL(triggered()), this, SLOT(redo()));
Chris@17:     
Chris@17:     m_redoMenuAction = new QAction(QIcon(":/icons/redo.png"), tr("Re&do"), this);
Chris@17:     connect(m_redoMenuAction, SIGNAL(triggered()), this, SLOT(redo()));
Chris@16: 
Chris@16:     m_redoMenu = new QMenu(tr("Re&do"));
Chris@17:     m_redoMenuAction->setMenu(m_redoMenu);
Chris@16:     connect(m_redoMenu, SIGNAL(triggered(QAction *)),
Chris@16: 	    this, SLOT(redoActivated(QAction*)));
Chris@16: }
Chris@16: 
Chris@17: CommandHistory::~CommandHistory()
Chris@16: {
Chris@16:     m_savedAt = -1;
Chris@16:     clearStack(m_undoStack);
Chris@16:     clearStack(m_redoStack);
Chris@16: 
Chris@16:     delete m_undoMenu;
Chris@16:     delete m_redoMenu;
Chris@16: }
Chris@16: 
Chris@17: CommandHistory *
Chris@17: CommandHistory::getInstance()
Chris@17: {
Chris@17:     if (!m_instance) m_instance = new CommandHistory();
Chris@17:     return m_instance;
Chris@17: }
Chris@17: 
Chris@16: void
Chris@17: CommandHistory::clear()
Chris@16: {
Chris@16:     m_savedAt = -1;
Chris@16:     clearStack(m_undoStack);
Chris@16:     clearStack(m_redoStack);
Chris@16:     updateActions();
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::registerMenu(QMenu *menu)
Chris@16: {
Chris@16:     menu->addAction(m_undoAction);
Chris@16:     menu->addAction(m_redoAction);
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::registerToolbar(QToolBar *toolbar)
Chris@16: {
Chris@17:     toolbar->addAction(m_undoMenuAction);
Chris@17:     toolbar->addAction(m_redoMenuAction);
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::addCommand(Command *command, bool execute)
Chris@16: {
Chris@16:     if (!command) return;
Chris@16: 
Chris@17:     std::cerr << "MVCH::addCommand: " << command->getName().toLocal8Bit().data() << std::endl;
Chris@16: 
Chris@16:     // We can't redo after adding a command
Chris@16:     clearStack(m_redoStack);
Chris@16: 
Chris@16:     // can we reach savedAt?
Chris@16:     if ((int)m_undoStack.size() < m_savedAt) m_savedAt = -1; // nope
Chris@16: 
Chris@16:     m_undoStack.push(command);
Chris@16:     clipCommands();
Chris@16:     
Chris@16:     if (execute) {
Chris@16: 	command->execute();
Chris@16:     }
Chris@16: 
Chris@17:     // Emit even if we aren't executing the command, because
Chris@17:     // someone must have executed it for this to make any sense
Chris@17:     emit commandExecuted();
Chris@17:     emit commandExecuted(command);
Chris@17: 
Chris@16:     updateActions();
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::addExecutedCommand(Command *command)
Chris@17: {
Chris@17:     addCommand(command, false);
Chris@17: }
Chris@17: 
Chris@17: void
Chris@17: CommandHistory::addCommandAndExecute(Command *command)
Chris@17: {
Chris@17:     addCommand(command, true);
Chris@17: }
Chris@17: 
Chris@17: void
Chris@17: CommandHistory::undo()
Chris@16: {
Chris@16:     if (m_undoStack.empty()) return;
Chris@16: 
Chris@16:     Command *command = m_undoStack.top();
Chris@16:     command->unexecute();
Chris@16:     emit commandExecuted();
Chris@17:     emit commandUnexecuted(command);
Chris@16: 
Chris@16:     m_redoStack.push(command);
Chris@16:     m_undoStack.pop();
Chris@16: 
Chris@16:     clipCommands();
Chris@16:     updateActions();
Chris@16: 
Chris@16:     if ((int)m_undoStack.size() == m_savedAt) emit documentRestored();
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::redo()
Chris@16: {
Chris@16:     if (m_redoStack.empty()) return;
Chris@16: 
Chris@16:     Command *command = m_redoStack.top();
Chris@16:     command->execute();
Chris@16:     emit commandExecuted();
Chris@16:     emit commandExecuted(command);
Chris@16: 
Chris@16:     m_undoStack.push(command);
Chris@16:     m_redoStack.pop();
Chris@16:     // no need to clip
Chris@16: 
Chris@16:     updateActions();
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::setUndoLimit(int limit)
Chris@16: {
Chris@16:     if (limit > 0 && limit != m_undoLimit) {
Chris@16:         m_undoLimit = limit;
Chris@16:         clipCommands();
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::setRedoLimit(int limit)
Chris@16: {
Chris@16:     if (limit > 0 && limit != m_redoLimit) {
Chris@16:         m_redoLimit = limit;
Chris@16:         clipCommands();
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::documentSaved()
Chris@16: {
Chris@16:     m_savedAt = m_undoStack.size();
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::clipCommands()
Chris@16: {
Chris@16:     if ((int)m_undoStack.size() > m_undoLimit) {
Chris@16: 	m_savedAt -= (m_undoStack.size() - m_undoLimit);
Chris@16:     }
Chris@16: 
Chris@16:     clipStack(m_undoStack, m_undoLimit);
Chris@16:     clipStack(m_redoStack, m_redoLimit);
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::clipStack(CommandStack &stack, int limit)
Chris@16: {
Chris@16:     int i;
Chris@16: 
Chris@16:     if ((int)stack.size() > limit) {
Chris@16: 
Chris@16: 	CommandStack tempStack;
Chris@16: 
Chris@16: 	for (i = 0; i < limit; ++i) {
Chris@16: 	    Command *command = stack.top();
Chris@17: 	    std::cerr << "MVCH::clipStack: Saving recent command: " << command->getName().toLocal8Bit().data() << " at " << command << std::endl;
Chris@16: 	    tempStack.push(stack.top());
Chris@16: 	    stack.pop();
Chris@16: 	}
Chris@16: 
Chris@16: 	clearStack(stack);
Chris@16: 
Chris@16: 	for (i = 0; i < m_undoLimit; ++i) {
Chris@16: 	    stack.push(tempStack.top());
Chris@16: 	    tempStack.pop();
Chris@16: 	}
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::clearStack(CommandStack &stack)
Chris@16: {
Chris@16:     while (!stack.empty()) {
Chris@16: 	Command *command = stack.top();
Chris@17: 	std::cerr << "MVCH::clearStack: About to delete command: " << command->getName().toLocal8Bit().data() << " at " << command << std::endl;
Chris@16: 	delete command;
Chris@16: 	stack.pop();
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::undoActivated(QAction *action)
Chris@16: {
Chris@16:     int pos = m_actionCounts[action];
Chris@16:     for (int i = 0; i <= pos; ++i) {
Chris@16: 	undo();
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::redoActivated(QAction *action)
Chris@16: {
Chris@16:     int pos = m_actionCounts[action];
Chris@16:     for (int i = 0; i <= pos; ++i) {
Chris@16: 	redo();
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: void
Chris@17: CommandHistory::updateActions()
Chris@16: {
Chris@16:     m_actionCounts.clear();
Chris@16: 
Chris@16:     for (int undo = 0; undo <= 1; ++undo) {
Chris@16: 
Chris@17: 	QAction *action(undo ? m_undoAction : m_redoAction);
Chris@17: 	QAction *menuAction(undo ? m_undoMenuAction : m_redoMenuAction);
Chris@16: 	QMenu *menu(undo ? m_undoMenu : m_redoMenu);
Chris@16: 	CommandStack &stack(undo ? m_undoStack : m_redoStack);
Chris@16: 
Chris@17: 	if (stack.empty()) {
Chris@17: 
Chris@17: 	    QString text(undo ? tr("Nothing to undo") : tr("Nothing to redo"));
Chris@17: 
Chris@17: 	    action->setEnabled(false);
Chris@17: 	    action->setText(text);
Chris@17: 
Chris@17: 	    menuAction->setEnabled(false);
Chris@17: 	    menuAction->setText(text);
Chris@17: 
Chris@17: 	} else {
Chris@17: 
Chris@17: 	    action->setEnabled(true);
Chris@17: 	    menuAction->setEnabled(true);
Chris@17: 
Chris@17: 	    QString commandName = stack.top()->getName();
Chris@17: 	    commandName.replace(QRegExp("&"), "");
Chris@17: 
Chris@17: 	    QString text = (undo ? tr("&Undo %1") : tr("Re&do %1"))
Chris@17: 		.arg(commandName);
Chris@17: 
Chris@17: 	    action->setText(text);
Chris@17: 	    menuAction->setText(text);
Chris@17: 	}
Chris@17: 
Chris@16: 	menu->clear();
Chris@16: 
Chris@16: 	CommandStack tempStack;
Chris@16: 	int j = 0;
Chris@16: 
Chris@16: 	while (j < 10 && !stack.empty()) {
Chris@16: 
Chris@16: 	    Command *command = stack.top();
Chris@16: 	    tempStack.push(command);
Chris@16: 	    stack.pop();
Chris@16: 
Chris@17: 	    QString commandName = command->getName();
Chris@16: 	    commandName.replace(QRegExp("&"), "");
Chris@16: 
Chris@16: 	    QString text;
Chris@16: 	    if (undo) text = tr("&Undo %1").arg(commandName);
Chris@16: 	    else      text = tr("Re&do %1").arg(commandName);
Chris@16: 	    
Chris@16: 	    QAction *action = menu->addAction(text);
Chris@16: 	    m_actionCounts[action] = j++;
Chris@16: 	}
Chris@16: 
Chris@16: 	while (!tempStack.empty()) {
Chris@16: 	    stack.push(tempStack.top());
Chris@16: 	    tempStack.pop();
Chris@16: 	}
Chris@16:     }
Chris@16: }
Chris@16: