view base/CommandHistory.cpp @ 29:8460b3bf8f04

* Implement play mute, level and pan controls and a layer visibility control
* Handle swapping the buffers in AudioCallbackPlaySource more gracefully, so
  that in many cases it can be done inaudibly.  Still gets it wrong when
  playing in a noncontiguous selection.
* Fix to SV file save for non-2d sparse models
* Fixes to LED button drawing and AudioDial mouse functionality
* Add progress bar for Ogg file import
* Reshuffle PropertyContainer and its subclasses so it can be a QObject
* Add layer dormancy (invisible layer permitted to free its cache space)
* Optimisations to SpectrogramLayer, removing locks when reading/writing
  individual pixels in the cache (should be unnecessary there) -- there's
  still an issue here as we need a lock when reading from the model in
  case the model is replaced, and we don't currently have one
* Several munlock() calls to make it harder to exhaust real memory if
  running in an RT mode with mlockall() active

/* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */

/*
    A waveform viewer and audio annotation editor.
    Chris Cannam, Queen Mary University of London, 2005-2006
    
    This is experimental software.  Not for distribution.
*/

/*
   This is a modified version of a source file from the Rosegarden
   MIDI and audio sequencer and notation editor, copyright 2000-2006
   Chris Cannam, distributed under the GNU General Public License.

   This file contains traces of the KCommandHistory class from the KDE
   project, copyright 2000 Werner Trobin and David Faure and
   distributed under the GNU Lesser General Public License.
*/

#include "CommandHistory.h"

#include "Command.h"

#include <QRegExp>
#include <QMenu>
#include <QToolBar>
#include <QString>

#include <iostream>

CommandHistory *CommandHistory::m_instance = 0;

CommandHistory::CommandHistory() :
    m_undoLimit(50),
    m_redoLimit(50),
    m_savedAt(0)
{
    m_undoAction = new QAction(QIcon(":/icons/undo.png"), tr("&Undo"), this);
    m_undoAction->setShortcut(tr("Ctrl+Z"));
    connect(m_undoAction, SIGNAL(triggered()), this, SLOT(undo()));
    
    m_undoMenuAction = new QAction(QIcon(":/icons/undo.png"), tr("&Undo"), this);
    connect(m_undoMenuAction, SIGNAL(triggered()), this, SLOT(undo()));
    
    m_undoMenu = new QMenu(tr("&Undo"));
    m_undoMenuAction->setMenu(m_undoMenu);
    connect(m_undoMenu, SIGNAL(triggered(QAction *)),
	    this, SLOT(undoActivated(QAction*)));

    m_redoAction = new QAction(QIcon(":/icons/redo.png"), tr("Re&do"), this);
    m_redoAction->setShortcut(tr("Ctrl+Shift+Z"));
    connect(m_redoAction, SIGNAL(triggered()), this, SLOT(redo()));
    
    m_redoMenuAction = new QAction(QIcon(":/icons/redo.png"), tr("Re&do"), this);
    connect(m_redoMenuAction, SIGNAL(triggered()), this, SLOT(redo()));

    m_redoMenu = new QMenu(tr("Re&do"));
    m_redoMenuAction->setMenu(m_redoMenu);
    connect(m_redoMenu, SIGNAL(triggered(QAction *)),
	    this, SLOT(redoActivated(QAction*)));
}

CommandHistory::~CommandHistory()
{
    m_savedAt = -1;
    clearStack(m_undoStack);
    clearStack(m_redoStack);

    delete m_undoMenu;
    delete m_redoMenu;
}

CommandHistory *
CommandHistory::getInstance()
{
    if (!m_instance) m_instance = new CommandHistory();
    return m_instance;
}

void
CommandHistory::clear()
{
    m_savedAt = -1;
    clearStack(m_undoStack);
    clearStack(m_redoStack);
    updateActions();
}

void
CommandHistory::registerMenu(QMenu *menu)
{
    menu->addAction(m_undoAction);
    menu->addAction(m_redoAction);
}

void
CommandHistory::registerToolbar(QToolBar *toolbar)
{
    toolbar->addAction(m_undoMenuAction);
    toolbar->addAction(m_redoMenuAction);
}

void
CommandHistory::addCommand(Command *command, bool execute)
{
    if (!command) return;

    std::cerr << "MVCH::addCommand: " << command->getName().toLocal8Bit().data() << std::endl;

    // We can't redo after adding a command
    clearStack(m_redoStack);

    // can we reach savedAt?
    if ((int)m_undoStack.size() < m_savedAt) m_savedAt = -1; // nope

    m_undoStack.push(command);
    clipCommands();
    
    if (execute) {
	command->execute();
    }

    // Emit even if we aren't executing the command, because
    // someone must have executed it for this to make any sense
    emit commandExecuted();
    emit commandExecuted(command);

    updateActions();
}

void
CommandHistory::addExecutedCommand(Command *command)
{
    addCommand(command, false);
}

void
CommandHistory::addCommandAndExecute(Command *command)
{
    addCommand(command, true);
}

void
CommandHistory::undo()
{
    if (m_undoStack.empty()) return;

    Command *command = m_undoStack.top();
    command->unexecute();
    emit commandExecuted();
    emit commandUnexecuted(command);

    m_redoStack.push(command);
    m_undoStack.pop();

    clipCommands();
    updateActions();

    if ((int)m_undoStack.size() == m_savedAt) emit documentRestored();
}

void
CommandHistory::redo()
{
    if (m_redoStack.empty()) return;

    Command *command = m_redoStack.top();
    command->execute();
    emit commandExecuted();
    emit commandExecuted(command);

    m_undoStack.push(command);
    m_redoStack.pop();
    // no need to clip

    updateActions();
}

void
CommandHistory::setUndoLimit(int limit)
{
    if (limit > 0 && limit != m_undoLimit) {
        m_undoLimit = limit;
        clipCommands();
    }
}

void
CommandHistory::setRedoLimit(int limit)
{
    if (limit > 0 && limit != m_redoLimit) {
        m_redoLimit = limit;
        clipCommands();
    }
}

void
CommandHistory::documentSaved()
{
    m_savedAt = m_undoStack.size();
}

void
CommandHistory::clipCommands()
{
    if ((int)m_undoStack.size() > m_undoLimit) {
	m_savedAt -= (m_undoStack.size() - m_undoLimit);
    }

    clipStack(m_undoStack, m_undoLimit);
    clipStack(m_redoStack, m_redoLimit);
}

void
CommandHistory::clipStack(CommandStack &stack, int limit)
{
    int i;

    if ((int)stack.size() > limit) {

	CommandStack tempStack;

	for (i = 0; i < limit; ++i) {
	    Command *command = stack.top();
	    std::cerr << "MVCH::clipStack: Saving recent command: " << command->getName().toLocal8Bit().data() << " at " << command << std::endl;
	    tempStack.push(stack.top());
	    stack.pop();
	}

	clearStack(stack);

	for (i = 0; i < m_undoLimit; ++i) {
	    stack.push(tempStack.top());
	    tempStack.pop();
	}
    }
}

void
CommandHistory::clearStack(CommandStack &stack)
{
    while (!stack.empty()) {
	Command *command = stack.top();
	std::cerr << "MVCH::clearStack: About to delete command: " << command->getName().toLocal8Bit().data() << " at " << command << std::endl;
	delete command;
	stack.pop();
    }
}

void
CommandHistory::undoActivated(QAction *action)
{
    int pos = m_actionCounts[action];
    for (int i = 0; i <= pos; ++i) {
	undo();
    }
}

void
CommandHistory::redoActivated(QAction *action)
{
    int pos = m_actionCounts[action];
    for (int i = 0; i <= pos; ++i) {
	redo();
    }
}

void
CommandHistory::updateActions()
{
    m_actionCounts.clear();

    for (int undo = 0; undo <= 1; ++undo) {

	QAction *action(undo ? m_undoAction : m_redoAction);
	QAction *menuAction(undo ? m_undoMenuAction : m_redoMenuAction);
	QMenu *menu(undo ? m_undoMenu : m_redoMenu);
	CommandStack &stack(undo ? m_undoStack : m_redoStack);

	if (stack.empty()) {

	    QString text(undo ? tr("Nothing to undo") : tr("Nothing to redo"));

	    action->setEnabled(false);
	    action->setText(text);

	    menuAction->setEnabled(false);
	    menuAction->setText(text);

	} else {

	    action->setEnabled(true);
	    menuAction->setEnabled(true);

	    QString commandName = stack.top()->getName();
	    commandName.replace(QRegExp("&"), "");

	    QString text = (undo ? tr("&Undo %1") : tr("Re&do %1"))
		.arg(commandName);

	    action->setText(text);
	    menuAction->setText(text);
	}

	menu->clear();

	CommandStack tempStack;
	int j = 0;

	while (j < 10 && !stack.empty()) {

	    Command *command = stack.top();
	    tempStack.push(command);
	    stack.pop();

	    QString commandName = command->getName();
	    commandName.replace(QRegExp("&"), "");

	    QString text;
	    if (undo) text = tr("&Undo %1").arg(commandName);
	    else      text = tr("Re&do %1").arg(commandName);
	    
	    QAction *action = menu->addAction(text);
	    m_actionCounts[action] = j++;
	}

	while (!tempStack.empty()) {
	    stack.push(tempStack.top());
	    tempStack.pop();
	}
    }
}