view widgets/Panner.cpp @ 11:2d5005f2b3d9

* Rework handling of layer properties in file I/O -- we now get the individual
  layers to load and save them rather than doing it via generic property lists
  in the base class, so as to ensure we read and write meaningful values rather
  than generic int values requiring conversion.

/* -*- 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 "Panner.h"
#include "base/Layer.h"
#include "base/Model.h"
#include "base/ZoomConstraint.h"

#include <QPaintEvent>
#include <QPainter>
#include <iostream>

using std::cerr;
using std::endl;

Panner::Panner(QWidget *w) :
    View(w, false),
    m_clickedInRange(false)
{
    setObjectName(tr("Panner"));
    m_followPan = false;
    m_followZoom = false;
}

void
Panner::modelChanged(size_t startFrame, size_t endFrame)
{
    View::modelChanged(startFrame, endFrame);
}

void
Panner::modelReplaced()
{
    View::modelReplaced();
}

void
Panner::registerView(View *widget)
{
    m_widgets[widget] = WidgetRec(0, -1);
    update(); 
}

void
Panner::unregisterView(View *widget)
{
    m_widgets.erase(widget);
    update();
}

void
Panner::viewManagerCentreFrameChanged(void *p, unsigned long f, bool)
{
//    std::cerr << "Panner[" << this << "]::viewManagerCentreFrameChanged(" 
//	      << p << ", " << f << ")" << std::endl;

    if (p == this) return;
    if (m_widgets.find(p) != m_widgets.end()) {
	m_widgets[p].first = f;
	update();
    }
}

void
Panner::viewManagerZoomLevelChanged(void *p, unsigned long z, bool)
{
    if (p == this) return;
    if (m_widgets.find(p) != m_widgets.end()) {
	m_widgets[p].second = z;
	update();
    }
}

void
Panner::viewManagerPlaybackFrameChanged(unsigned long f)
{
    bool changed = false;

    if (m_playPointerFrame / m_zoomLevel != f / m_zoomLevel) changed = true;
    m_playPointerFrame = f;

    for (WidgetMap::iterator i = m_widgets.begin(); i != m_widgets.end(); ++i) {
	unsigned long of = i->second.first;
	i->second.first = f;
	if (of / m_zoomLevel != f / m_zoomLevel) changed = true;
    }

    if (changed) update();
}

void
Panner::paintEvent(QPaintEvent *e)
{
/*!!!
    // Force View to recalculate zoom in case the size of the
    // widget has changed.  (We need a better name/mechanism for this)
    m_newModel = true;
*/

    // Recalculate zoom in case the size of the widget has changed.

    size_t startFrame = getModelsStartFrame();
    size_t frameCount = getModelsEndFrame() - getModelsStartFrame();
    int zoomLevel = frameCount / width();
    if (zoomLevel < 1) zoomLevel = 1;
    zoomLevel = getZoomConstraintBlockSize(zoomLevel,
					   ZoomConstraint::RoundUp);
    if (zoomLevel != m_zoomLevel) {
	m_zoomLevel = zoomLevel;
	emit zoomLevelChanged(this, m_zoomLevel, m_followZoom);
    }
    size_t centreFrame = startFrame + m_zoomLevel * (width() / 2);
    if (centreFrame > (startFrame + getModelsEndFrame())/2) {
	centreFrame = (startFrame + getModelsEndFrame())/2;
    }
    if (centreFrame != m_centreFrame) {
	m_centreFrame = centreFrame;
	emit centreFrameChanged(this, m_centreFrame, false);
    }

    View::paintEvent(e);

    QPainter paint;
    paint.begin(this);

    QRect r(rect());

    if (e) {
	r = e->rect();
	paint.setClipRect(r);
    }

    paint.setPen(Qt::black);

    int y = 0;
    long prevCentre = 0;
    long prevZoom = -1;

    for (WidgetMap::iterator i = m_widgets.begin(); i != m_widgets.end(); ++i) {
	if (!i->first) continue;

	View *w = (View *)i->first;
	if (i->second.second < 0) i->second.second = w->getZoomLevel();
	if (i->second.second < 0) continue;

	long c = (long)i->second.first;
	long z = (long)i->second.second;

	long f0 = c - (w->width() / 2) * z;
	long f1 = c + (w->width() / 2) * z;

	int x0 = (f0 - long(getCentreFrame())) / getZoomLevel() + width()/2;
	int x1 = (f1 - long(getCentreFrame())) / getZoomLevel() + width()/2 - 1;

	if (c != prevCentre || z != prevZoom) {
	    y += height() / 10 + 1;
	    prevCentre = c;
	    prevZoom = z;
	}
	
	paint.drawRect(x0, y, x1 - x0, height() - 2 * y);
    }

    paint.end();
}

void
Panner::mousePressEvent(QMouseEvent *e)
{
    m_clickPos = e->pos();
    for (WidgetMap::iterator i = m_widgets.begin(); i != m_widgets.end(); ++i) {
	if (i->first && i->second.second >= 0) {
	    m_clickedInRange = true;
	    m_dragCentreFrame = i->second.first;
	}
    }
}

void
Panner::mouseReleaseEvent(QMouseEvent *e)
{
    if (m_clickedInRange) {
	mouseMoveEvent(e);
    }
    m_clickedInRange = false;
}

void
Panner::mouseMoveEvent(QMouseEvent *e)
{
    if (!m_clickedInRange) return;

/*!!!
    long newFrame = getStartFrame() + e->x() * m_zoomLevel;

    if (newFrame < 0) newFrame = 0;
    if (newFrame >= getModelsEndFrame()) {
	newFrame = getModelsEndFrame();
	if (newFrame > 0) --newFrame;
    }
    emit centreFrameChanged(this, newFrame, true);
*/

    long xoff = int(e->x()) - int(m_clickPos.x());
    long frameOff = xoff * m_zoomLevel;
    
    size_t newCentreFrame = m_dragCentreFrame;
    if (frameOff > 0) {
	newCentreFrame += frameOff;
    } else if (newCentreFrame >= size_t(-frameOff)) {
	newCentreFrame += frameOff;
    } else {
	newCentreFrame = 0;
    }

    if (newCentreFrame >= getModelsEndFrame()) {
	newCentreFrame = getModelsEndFrame();
	if (newCentreFrame > 0) --newCentreFrame;
    }
    
    if (std::max(m_centreFrame, newCentreFrame) -
	std::min(m_centreFrame, newCentreFrame) > size_t(m_zoomLevel)) {
	emit centreFrameChanged(this, newCentreFrame, true);
    }
}

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