Chris@127: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@127: 
Chris@127: /*
Chris@127:     Sonic Visualiser
Chris@127:     An audio file viewer and annotation editor.
Chris@127:     Centre for Digital Music, Queen Mary, University of London.
Chris@127:     This file copyright 2006 Chris Cannam.
Chris@127:     
Chris@127:     This program is free software; you can redistribute it and/or
Chris@127:     modify it under the terms of the GNU General Public License as
Chris@127:     published by the Free Software Foundation; either version 2 of the
Chris@127:     License, or (at your option) any later version.  See the file
Chris@127:     COPYING included with this distribution for more information.
Chris@127: */
Chris@127: 
Chris@127: #include "Panner.h"
Chris@128: #include "layer/Layer.h"
Chris@128: #include "data/model/Model.h"
Chris@127: #include "base/ZoomConstraint.h"
Chris@127: 
Chris@127: #include <QPaintEvent>
Chris@127: #include <QPainter>
Chris@127: #include <iostream>
Chris@127: 
Chris@127: using std::cerr;
Chris@127: using std::endl;
Chris@127: 
Chris@127: Panner::Panner(QWidget *w) :
Chris@127:     View(w, false),
Chris@127:     m_clickedInRange(false)
Chris@127: {
Chris@127:     setObjectName(tr("Panner"));
Chris@127:     m_followPan = false;
Chris@127:     m_followZoom = false;
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::modelChanged(size_t startFrame, size_t endFrame)
Chris@127: {
Chris@127:     View::modelChanged(startFrame, endFrame);
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::modelReplaced()
Chris@127: {
Chris@127:     View::modelReplaced();
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::registerView(View *widget)
Chris@127: {
Chris@127:     m_widgets.insert(widget);
Chris@127:     update(); 
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::unregisterView(View *widget)
Chris@127: {
Chris@127:     m_widgets.erase(widget);
Chris@127:     update();
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::viewManagerCentreFrameChanged(void *p, unsigned long f, bool)
Chris@127: {
Chris@127: //    std::cerr << "Panner[" << this << "]::viewManagerCentreFrameChanged(" 
Chris@127: //	      << p << ", " << f << ")" << std::endl;
Chris@127: 
Chris@127:     if (p == this) return;
Chris@127:     if (m_widgets.find(p) != m_widgets.end()) {
Chris@127: 	update();
Chris@127:     }
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::viewManagerZoomLevelChanged(void *p, unsigned long z, bool)
Chris@127: {
Chris@127:     if (p == this) return;
Chris@127:     if (m_widgets.find(p) != m_widgets.end()) {
Chris@127: 	update();
Chris@127:     }
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::viewManagerPlaybackFrameChanged(unsigned long f)
Chris@127: {
Chris@127:     bool changed = false;
Chris@127: 
Chris@127:     if (getXForFrame(m_playPointerFrame) != getXForFrame(f)) changed = true;
Chris@127:     m_playPointerFrame = f;
Chris@127: 
Chris@127:     if (changed) update();
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::paintEvent(QPaintEvent *e)
Chris@127: {
Chris@127:     // Recalculate zoom in case the size of the widget has changed.
Chris@127: 
Chris@127:     size_t startFrame = getModelsStartFrame();
Chris@127:     size_t frameCount = getModelsEndFrame() - getModelsStartFrame();
Chris@127:     int zoomLevel = frameCount / width();
Chris@127:     if (zoomLevel < 1) zoomLevel = 1;
Chris@127:     zoomLevel = getZoomConstraintBlockSize(zoomLevel,
Chris@127: 					   ZoomConstraint::RoundUp);
Chris@127:     if (zoomLevel != m_zoomLevel) {
Chris@127: 	m_zoomLevel = zoomLevel;
Chris@127: 	emit zoomLevelChanged(this, m_zoomLevel, m_followZoom);
Chris@127:     }
Chris@127:     size_t centreFrame = startFrame + m_zoomLevel * (width() / 2);
Chris@127:     if (centreFrame > (startFrame + getModelsEndFrame())/2) {
Chris@127: 	centreFrame = (startFrame + getModelsEndFrame())/2;
Chris@127:     }
Chris@127:     if (centreFrame != m_centreFrame) {
Chris@127: 	m_centreFrame = centreFrame;
Chris@127: 	emit centreFrameChanged(this, m_centreFrame, false);
Chris@127:     }
Chris@127: 
Chris@127:     View::paintEvent(e);
Chris@127: 
Chris@127:     QPainter paint;
Chris@127:     paint.begin(this);
Chris@127: 
Chris@127:     QRect r(rect());
Chris@127: 
Chris@127:     if (e) {
Chris@127: 	r = e->rect();
Chris@127: 	paint.setClipRect(r);
Chris@127:     }
Chris@127: 
Chris@127:     paint.setPen(Qt::black);
Chris@127: 
Chris@127:     int y = 0;
Chris@127: 
Chris@127:     int prevx0 = -10;
Chris@127:     int prevx1 = -10;
Chris@127: 
Chris@127:     for (WidgetSet::iterator i = m_widgets.begin(); i != m_widgets.end(); ++i) {
Chris@127: 	if (!*i) continue;
Chris@127: 
Chris@127: 	View *w = (View *)*i;
Chris@127: 
Chris@127: 	long f0 = w->getFrameForX(0);
Chris@127: 	long f1 = w->getFrameForX(w->width());
Chris@127: 
Chris@127: 	int x0 = getXForFrame(f0);
Chris@127: 	int x1 = getXForFrame(f1);
Chris@127: 
Chris@127: 	if (x0 != prevx0 || x1 != prevx1) {
Chris@127: 	    y += height() / 10 + 1;
Chris@127: 	    prevx0 = x0;
Chris@127: 	    prevx1 = x1;
Chris@127: 	}
Chris@127: 
Chris@127: 	if (x1 <= x0) x1 = x0 + 1;
Chris@127: 	
Chris@127: 	paint.drawRect(x0, y, x1 - x0, height() - 2 * y);
Chris@127:     }
Chris@127: 
Chris@127:     paint.end();
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::mousePressEvent(QMouseEvent *e)
Chris@127: {
Chris@127:     m_clickPos = e->pos();
Chris@127:     for (WidgetSet::iterator i = m_widgets.begin(); i != m_widgets.end(); ++i) {
Chris@127: 	if (*i) {
Chris@127: 	    m_clickedInRange = true;
Chris@127: 	    m_dragCentreFrame = ((View *)*i)->getCentreFrame();
Chris@127: 	    break;
Chris@127: 	}
Chris@127:     }
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::mouseReleaseEvent(QMouseEvent *e)
Chris@127: {
Chris@127:     if (m_clickedInRange) {
Chris@127: 	mouseMoveEvent(e);
Chris@127:     }
Chris@127:     m_clickedInRange = false;
Chris@127: }
Chris@127: 
Chris@127: void
Chris@127: Panner::mouseMoveEvent(QMouseEvent *e)
Chris@127: {
Chris@127:     if (!m_clickedInRange) return;
Chris@127: 
Chris@127:     long xoff = int(e->x()) - int(m_clickPos.x());
Chris@127:     long frameOff = xoff * m_zoomLevel;
Chris@127:     
Chris@127:     size_t newCentreFrame = m_dragCentreFrame;
Chris@127:     if (frameOff > 0) {
Chris@127: 	newCentreFrame += frameOff;
Chris@127:     } else if (newCentreFrame >= size_t(-frameOff)) {
Chris@127: 	newCentreFrame += frameOff;
Chris@127:     } else {
Chris@127: 	newCentreFrame = 0;
Chris@127:     }
Chris@127: 
Chris@127:     if (newCentreFrame >= getModelsEndFrame()) {
Chris@127: 	newCentreFrame = getModelsEndFrame();
Chris@127: 	if (newCentreFrame > 0) --newCentreFrame;
Chris@127:     }
Chris@127:     
Chris@127:     if (std::max(m_centreFrame, newCentreFrame) -
Chris@127: 	std::min(m_centreFrame, newCentreFrame) > size_t(m_zoomLevel)) {
Chris@127: 	emit centreFrameChanged(this, newCentreFrame, true);
Chris@127:     }
Chris@127: }
Chris@127: 
Chris@127: #ifdef INCLUDE_MOCFILES
Chris@127: #include "Panner.moc.cpp"
Chris@127: #endif
Chris@127: