diff base/MultiViewCommandHistory.cpp @ 16:cc98d496d52b

* Add command history class, and basic undo/redo menus.  No actual commands
  to undo/redo yet.  Selecting the placeholders sometimes seems to cause
  a crash, so this looks a little uncertain so far.

* Add Rename Layer

* Remove models from playback when their layers are removed (and ref counts
  hit zero)

* Don't hang around waiting so much when there's work to be done in the audio
  buffer fill thread

* Put more sensible names on layers generated from transforms

* Add basic editing to time-value layer like existing editing in time-instants
  layer, and make both of them snap to the appropriate resolution during drag

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/MultiViewCommandHistory.cpp	Mon Jan 30 17:51:56 2006 +0000
@@ -0,0 +1,299 @@
+/* -*- 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 "MultiViewCommandHistory.h"
+
+#include "Command.h"
+
+#include <QRegExp>
+#include <QMenu>
+#include <QToolBar>
+#include <QString>
+
+#include <iostream>
+
+MultiViewCommandHistory::MultiViewCommandHistory() :
+    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_undoMenu = new QMenu(tr("&Undo"));
+    m_undoAction->setMenu(m_undoMenu);
+    connect(m_undoMenu, SIGNAL(triggered(QAction *)),
+	    this, SLOT(undoActivated(QAction*)));
+
+    m_redoAction = new QAction(QIcon(":/icons/redo.png"), tr("&Redo"), this);
+    m_redoAction->setShortcut(tr("Ctrl+Shift+Z"));
+    connect(m_redoAction, SIGNAL(triggered()), this, SLOT(redo()));
+
+    m_redoMenu = new QMenu(tr("Re&do"));
+    m_redoAction->setMenu(m_redoMenu);
+    connect(m_redoMenu, SIGNAL(triggered(QAction *)),
+	    this, SLOT(redoActivated(QAction*)));
+}
+
+MultiViewCommandHistory::~MultiViewCommandHistory()
+{
+    m_savedAt = -1;
+    clearStack(m_undoStack);
+    clearStack(m_redoStack);
+
+    delete m_undoMenu;
+    delete m_redoMenu;
+}
+
+void
+MultiViewCommandHistory::clear()
+{
+    m_savedAt = -1;
+    clearStack(m_undoStack);
+    clearStack(m_redoStack);
+    updateActions();
+}
+
+void
+MultiViewCommandHistory::registerMenu(QMenu *menu)
+{
+    menu->addAction(m_undoAction);
+    menu->addAction(m_redoAction);
+}
+
+void
+MultiViewCommandHistory::registerToolbar(QToolBar *toolbar)
+{
+    toolbar->addAction(m_undoAction);
+    toolbar->addAction(m_redoAction);
+}
+
+void
+MultiViewCommandHistory::addCommand(Command *command, bool execute)
+{
+    if (!command) return;
+
+    std::cerr << "MVCH::addCommand: " << command->name().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 commandExecuted();
+	emit commandExecuted(command);
+    }
+
+//    updateButtons();
+    updateActions();
+}
+
+void
+MultiViewCommandHistory::undo()
+{
+    if (m_undoStack.empty()) return;
+
+    Command *command = m_undoStack.top();
+    command->unexecute();
+    emit commandExecuted();
+    emit commandExecuted(command);
+
+    m_redoStack.push(command);
+    m_undoStack.pop();
+
+    clipCommands();
+    updateActions();
+
+    if ((int)m_undoStack.size() == m_savedAt) emit documentRestored();
+}
+
+void
+MultiViewCommandHistory::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
+MultiViewCommandHistory::setUndoLimit(int limit)
+{
+    if (limit > 0 && limit != m_undoLimit) {
+        m_undoLimit = limit;
+        clipCommands();
+    }
+}
+
+void
+MultiViewCommandHistory::setRedoLimit(int limit)
+{
+    if (limit > 0 && limit != m_redoLimit) {
+        m_redoLimit = limit;
+        clipCommands();
+    }
+}
+
+void
+MultiViewCommandHistory::documentSaved()
+{
+    m_savedAt = m_undoStack.size();
+}
+
+void
+MultiViewCommandHistory::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
+MultiViewCommandHistory::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->name().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
+MultiViewCommandHistory::clearStack(CommandStack &stack)
+{
+    while (!stack.empty()) {
+	Command *command = stack.top();
+	std::cerr << "MVCH::clearStack: About to delete command: " << command->name().toLocal8Bit().data() << " at " << command << std::endl;
+	delete command;
+	stack.pop();
+    }
+}
+
+void
+MultiViewCommandHistory::undoActivated(QAction *action)
+{
+    int pos = m_actionCounts[action];
+    for (int i = 0; i <= pos; ++i) {
+	undo();
+    }
+}
+
+void
+MultiViewCommandHistory::redoActivated(QAction *action)
+{
+    int pos = m_actionCounts[action];
+    for (int i = 0; i <= pos; ++i) {
+	redo();
+    }
+}
+
+void
+MultiViewCommandHistory::updateActions()
+{
+    if (m_undoStack.empty()) {
+	m_undoAction->setEnabled(false);
+	m_undoAction->setText(tr("Nothing to undo"));
+    } else {
+	m_undoAction->setEnabled(true);
+	QString commandName = m_undoStack.top()->name();
+	commandName.replace(QRegExp("&"), "");
+	QString text = tr("&Undo %1").arg(commandName);
+	m_undoAction->setText(text);
+    }
+
+    if (m_redoStack.empty()) {
+	m_redoAction->setEnabled(false);
+	m_redoAction->setText(tr("Nothing to redo"));
+    } else {
+	m_redoAction->setEnabled(true);
+	QString commandName = m_redoStack.top()->name();
+	commandName.replace(QRegExp("&"), "");
+	QString text = tr("Re&do %1").arg(commandName);
+	m_redoAction->setText(text);
+    }
+
+    m_actionCounts.clear();
+
+    for (int undo = 0; undo <= 1; ++undo) {
+
+	QMenu *menu(undo ? m_undoMenu : m_redoMenu);
+	CommandStack &stack(undo ? m_undoStack : m_redoStack);
+
+	menu->clear();
+
+	CommandStack tempStack;
+	int j = 0;
+
+	while (j < 10 && !stack.empty()) {
+
+	    Command *command = stack.top();
+	    tempStack.push(command);
+	    stack.pop();
+
+	    QString commandName = command->name();
+	    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();
+	}
+    }
+}
+