view base/ViewManager.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

/* -*- 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.
*/

#include "ViewManager.h"
#include "AudioPlaySource.h"
#include "PlayParameters.h"
#include "Model.h"

#include <iostream>

#define DEBUG_VIEW_MANAGER 1

ViewManager::ViewManager() :
    m_playSource(0),
    m_globalCentreFrame(0),
    m_globalZoom(1024),
    m_lastLeft(0), 
    m_lastRight(0),
    m_inProgressExclusive(true),
    m_toolMode(NavigateMode),
    m_playLoopMode(false),
    m_playSelectionMode(true)
{
    connect(this, 
	    SIGNAL(centreFrameChanged(void *, unsigned long, bool)),
	    SLOT(considerSeek(void *, unsigned long, bool)));

    connect(this, 
	    SIGNAL(zoomLevelChanged(void *, unsigned long, bool)),
	    SLOT(considerZoomChange(void *, unsigned long, bool)));
}

unsigned long
ViewManager::getGlobalCentreFrame() const
{
#ifdef DEBUG_VIEW_MANAGER
    std::cout << "ViewManager::getGlobalCentreFrame: returning " << m_globalCentreFrame << std::endl;
#endif
    return m_globalCentreFrame;
}

unsigned long
ViewManager::getGlobalZoom() const
{
#ifdef DEBUG_VIEW_MANAGER
    std::cout << "ViewManager::getGlobalZoom: returning " << m_globalZoom << std::endl;
#endif
    return m_globalZoom;
}

bool
ViewManager::haveInProgressSelection() const
{
    return !m_inProgressSelection.isEmpty();
}

const Selection &
ViewManager::getInProgressSelection(bool &exclusive) const
{
    exclusive = m_inProgressExclusive;
    return m_inProgressSelection;
}

void
ViewManager::setInProgressSelection(const Selection &selection, bool exclusive)
{
    m_inProgressExclusive = exclusive;
    m_inProgressSelection = selection;
    if (exclusive) clearSelections();
    emit inProgressSelectionChanged();
}

void
ViewManager::clearInProgressSelection()
{
    m_inProgressSelection = Selection();
    emit inProgressSelectionChanged();
}

const ViewManager::SelectionList &
ViewManager::getSelections() const
{
    return m_selections;
}

void
ViewManager::setSelection(const Selection &selection)
{
    clearSelections();
    addSelection(selection);
}

void
ViewManager::addSelection(const Selection &selection)
{
    m_selections.insert(selection);

    // Cope with a sitation where the new selection overlaps one or
    // more existing ones.  This is a terribly inefficient way to do
    // this, but that probably isn't significant in real life.

    // It's essential for the correct operation of
    // getContainingSelection that the selections do not overlap, so
    // this is not just a frill.

    for (SelectionList::iterator i = m_selections.begin();
	 i != m_selections.end(); ) {
	
	SelectionList::iterator j = i;
	if (++j == m_selections.end()) break;

	if (i->getEndFrame() >= j->getStartFrame()) {
	    Selection merged(i->getStartFrame(),
			     std::max(i->getEndFrame(), j->getEndFrame()));
	    m_selections.erase(i);
	    m_selections.erase(j);
	    m_selections.insert(merged);
	    i = m_selections.begin();
	} else {
	    ++i;
	}
    }

    emit selectionChanged();
}

void
ViewManager::removeSelection(const Selection &selection)
{
    //!!! Likewise this needs to cope correctly with the situation
    //where selection is not one of the original selection set but
    //simply overlaps one of them (cutting down the original selection
    //appropriately)

    if (m_selections.find(selection) != m_selections.end()) {
	m_selections.erase(selection);
	emit selectionChanged();
    }
}

void
ViewManager::clearSelections()
{
    if (!m_selections.empty()) {
	m_selections.clear();
	emit selectionChanged();
    }
}

Selection
ViewManager::getContainingSelection(size_t frame, bool defaultToFollowing)
{
    // This scales very badly with the number of selections, but it's
    // more efficient for very small numbers of selections than a more
    // scalable method, and I think that may be what we need

    for (SelectionList::const_iterator i = m_selections.begin();
	 i != m_selections.end(); ++i) {

	if (i->contains(frame)) return *i;

	if (i->getStartFrame() > frame) {
	    if (defaultToFollowing) return *i;
	    else return Selection();
	}
    }

    return Selection();
}

void
ViewManager::setToolMode(ToolMode mode)
{
    m_toolMode = mode;

    emit toolModeChanged();
}

void
ViewManager::setPlayLoopMode(bool mode)
{
    m_playLoopMode = mode;

    emit playLoopModeChanged();
}

void
ViewManager::setPlaySelectionMode(bool mode)
{
    m_playSelectionMode = mode;

    emit playSelectionModeChanged();
}

void
ViewManager::setAudioPlaySource(AudioPlaySource *source)
{
    if (!m_playSource) {
	QTimer::singleShot(100, this, SLOT(checkPlayStatus()));
    }
    m_playSource = source;
}

PlayParameters *
ViewManager::getPlayParameters(const Model *model)
{
    if (m_playParameters.find(model) == m_playParameters.end()) {
	// Give all models the same type of play parameters for the moment
	m_playParameters[model] = new PlayParameters;
    }

    return m_playParameters[model];
}

void
ViewManager::clearPlayParameters()
{
    while (!m_playParameters.empty()) {
	delete m_playParameters.begin()->second;
	m_playParameters.erase(m_playParameters.begin());
    }
}

void
ViewManager::playStatusChanged(bool playing)
{
    checkPlayStatus();
}

void
ViewManager::checkPlayStatus()
{
    if (m_playSource && m_playSource->isPlaying()) {

	float left = 0, right = 0;
	if (m_playSource->getOutputLevels(left, right)) {
	    if (left != m_lastLeft || right != m_lastRight) {
		emit outputLevelsChanged(left, right);
		m_lastLeft = left;
		m_lastRight = right;
	    }
	}

	m_globalCentreFrame = m_playSource->getCurrentPlayingFrame();

#ifdef DEBUG_VIEW_MANAGER
	std::cout << "ViewManager::checkPlayStatus: Playing, frame " << m_globalCentreFrame << ", levels " << m_lastLeft << "," << m_lastRight << std::endl;
#endif

	emit playbackFrameChanged(m_globalCentreFrame);

	QTimer::singleShot(20, this, SLOT(checkPlayStatus()));

    } else {

	QTimer::singleShot(100, this, SLOT(checkPlayStatus()));
	
	if (m_lastLeft != 0.0 || m_lastRight != 0.0) {
	    emit outputLevelsChanged(0.0, 0.0);
	    m_lastLeft = 0.0;
	    m_lastRight = 0.0;
	}

#ifdef DEBUG_VIEW_MANAGER
//	std::cout << "ViewManager::checkPlayStatus: Not playing" << std::endl;
#endif
    }
}

bool
ViewManager::isPlaying() const
{
    return m_playSource && m_playSource->isPlaying();
}

void
ViewManager::considerSeek(void *p, unsigned long f, bool locked)
{
    if (locked) {
	m_globalCentreFrame = f;
    }

#ifdef DEBUG_VIEW_MANAGER 
    std::cout << "ViewManager::considerSeek(" << p << ", " << f << ", " << locked << ")" << std::endl;
#endif

    if (p == this || !locked) return;

    if (m_playSource && m_playSource->isPlaying()) {
	unsigned long playFrame = m_playSource->getCurrentPlayingFrame();
	unsigned long diff = std::max(f, playFrame) - std::min(f, playFrame);
	if (diff > 20000) {
	    m_playSource->play(f);
#ifdef DEBUG_VIEW_MANAGER 
	    std::cout << "ViewManager::considerSeek: reseeking from " << playFrame << " to " << f << std::endl;
#endif
	}
    }
}

void
ViewManager::considerZoomChange(void *p, unsigned long z, bool locked)
{
    if (locked) {
	m_globalZoom = z;
    }

#ifdef DEBUG_VIEW_MANAGER 
    std::cout << "ViewManager::considerZoomChange(" << p << ", " << z << ", " << locked << ")" << std::endl;
#endif
}

#ifdef INCLUDE_MOCFILES
#include "ViewManager.moc.cpp"
#endif