annotate view/ViewManager.cpp @ 211:e2baee498ec8

* Rejig handling of scrolling views.  Ensures, among other things, that playing
  when there is a scroll mode view present (e.g. a spectrum) does not drag
  any page mode views into scroll mode with it.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam and QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "ViewManager.h"
#include "base/AudioPlaySource.h"
#include "data/model/Model.h"
#include "base/CommandHistory.h"
#include "View.h"

#include <QSettings>

#include <iostream>

//#define DEBUG_VIEW_MANAGER 1

ViewManager::ViewManager() :
    m_playSource(0),
    m_globalCentreFrame(0),
    m_globalZoom(1024),
    m_playbackFrame(0),
    m_mainModelSampleRate(0),
    m_lastLeft(0), 
    m_lastRight(0),
    m_inProgressExclusive(true),
    m_toolMode(NavigateMode),
    m_playLoopMode(false),
    m_playSelectionMode(false),
    m_overlayMode(StandardOverlays),
    m_zoomWheelsEnabled(true)
{
    QSettings settings;
    settings.beginGroup("MainWindow");
    m_overlayMode = OverlayMode
        (settings.value("overlay-mode", int(m_overlayMode)).toInt());
    m_zoomWheelsEnabled =
        settings.value("zoom-wheels-enabled", m_zoomWheelsEnabled).toBool();
    settings.endGroup();

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

ViewManager::~ViewManager()
{
}

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

void
ViewManager::setGlobalCentreFrame(unsigned long f)
{
#ifdef DEBUG_VIEW_MANAGER
    std::cout << "ViewManager::setGlobalCentreFrame to " << f << std::endl;
#endif
    m_globalCentreFrame = f;
    emit globalCentreFrameChanged(f);
}

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

unsigned long
ViewManager::getPlaybackFrame() const
{
    if (m_playSource && m_playSource->isPlaying()) {
	m_playbackFrame = m_playSource->getCurrentPlayingFrame();
    }
    return m_playbackFrame;
}

void
ViewManager::setPlaybackFrame(unsigned long f)
{
    if (m_playbackFrame != f) {
	m_playbackFrame = f;
	emit playbackFrameChanged(f);
	if (m_playSource && m_playSource->isPlaying()) {
	    m_playSource->play(f);
	}
    }
}

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 MultiSelection &
ViewManager::getSelection() const
{
    return m_selections;
}

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

void
ViewManager::setSelection(const Selection &selection)
{
    MultiSelection ms(m_selections);
    ms.setSelection(selection);
    setSelections(ms);
}

void
ViewManager::addSelection(const Selection &selection)
{
    MultiSelection ms(m_selections);
    ms.addSelection(selection);
    setSelections(ms);
}

void
ViewManager::removeSelection(const Selection &selection)
{
    MultiSelection ms(m_selections);
    ms.removeSelection(selection);
    setSelections(ms);
}

void
ViewManager::clearSelections()
{
    MultiSelection ms(m_selections);
    ms.clearSelections();
    setSelections(ms);
}

void
ViewManager::setSelections(const MultiSelection &ms)
{
    if (m_selections.getSelections() == ms.getSelections()) return;
    SetSelectionCommand *command = new SetSelectionCommand(this, ms);
    CommandHistory::getInstance()->addCommand(command);
}

void
ViewManager::signalSelectionChange()
{
    emit selectionChanged();
}

ViewManager::SetSelectionCommand::SetSelectionCommand(ViewManager *vm,
						      const MultiSelection &ms) :
    m_vm(vm),
    m_oldSelection(vm->m_selections),
    m_newSelection(ms)
{
}

ViewManager::SetSelectionCommand::~SetSelectionCommand() { }

void
ViewManager::SetSelectionCommand::execute()
{
    m_vm->m_selections = m_newSelection;
    m_vm->signalSelectionChange();
}

void
ViewManager::SetSelectionCommand::unexecute()
{
    m_vm->m_selections = m_oldSelection;
    m_vm->signalSelectionChange();
}

QString
ViewManager::SetSelectionCommand::getName() const
{
    if (m_newSelection.getSelections().empty()) return tr("Clear Selection");
    else return tr("Select");
}

Selection
ViewManager::getContainingSelection(size_t frame, bool defaultToFollowing) const
{
    return m_selections.getContainingSelection(frame, defaultToFollowing);
}

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

    emit toolModeChanged();
}

void
ViewManager::setPlayLoopMode(bool mode)
{
    if (m_playLoopMode != mode) {

        m_playLoopMode = mode;

        emit playLoopModeChanged();
        emit playLoopModeChanged(mode);
    }
}

void
ViewManager::setPlaySelectionMode(bool mode)
{
    if (m_playSelectionMode != mode) {

        m_playSelectionMode = mode;

        emit playSelectionModeChanged();
        emit playSelectionModeChanged(mode);
    }
}

size_t
ViewManager::getPlaybackSampleRate() const
{
    if (m_playSource) {
	return m_playSource->getTargetSampleRate();
    }
    return 0;
}

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

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_playbackFrame = m_playSource->getCurrentPlayingFrame();

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

	emit playbackFrameChanged(m_playbackFrame);

	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::viewCentreFrameChanged(unsigned long f, bool locked,
                                    PlaybackFollowMode mode)
{
    View *v = dynamic_cast<View *>(sender());

    if (locked) {
        m_globalCentreFrame = f;
        emit globalCentreFrameChanged(f);
    } else {
        if (v) emit viewCentreFrameChanged(v, f);
    }

    if (mode == PlaybackIgnore) {
        return;
    }

    seek(f);
}

void
ViewManager::seek(unsigned long f)
{
#ifdef DEBUG_VIEW_MANAGER 
    std::cout << "ViewManager::seek(" << f << ")" << std::endl;
#endif

    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_playbackFrame = f;
	    m_playSource->play(f);
#ifdef DEBUG_VIEW_MANAGER 
	    std::cout << "ViewManager::considerSeek: reseeking from " << playFrame << " to " << f << std::endl;
#endif
            emit playbackFrameChanged(f);
	}
    } else {
        if (m_playbackFrame != f) {
            m_playbackFrame = f;
            emit playbackFrameChanged(f);
        }
    }
}

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

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

void
ViewManager::setOverlayMode(OverlayMode mode)
{
    if (m_overlayMode != mode) {
        m_overlayMode = mode;
        emit overlayModeChanged();
    }

    QSettings settings;
    settings.beginGroup("MainWindow");
    settings.setValue("overlay-mode", int(m_overlayMode));
    settings.endGroup();
}

void
ViewManager::setZoomWheelsEnabled(bool enabled)
{
    if (m_zoomWheelsEnabled != enabled) {
        m_zoomWheelsEnabled = enabled;
        emit zoomWheelsEnabledChanged();
    }

    QSettings settings;
    settings.beginGroup("MainWindow");
    settings.setValue("zoom-wheels-enabled", m_zoomWheelsEnabled);
    settings.endGroup();
}