view view/Overview.cpp @ 920:e39d5d2734ed osx-retina

Fix crash caused by using proxy (of unknown lifecycle) instead of view as cache key

/* -*- 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 "Overview.h"
#include "layer/Layer.h"
#include "data/model/Model.h"
#include "base/ZoomConstraint.h"

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

//#define DEBUG_OVERVIEW 1


Overview::Overview(QWidget *w) :
    View(w, false),
    m_clickedInRange(false),
    m_dragCentreFrame(0)
{
    setObjectName(tr("Overview"));
    m_followPan = false;
    m_followZoom = false;
    setPlaybackFollow(PlaybackIgnore);
    m_modelTestTime.start();
}

void
Overview::modelChangedWithin(sv_frame_t startFrame, sv_frame_t endFrame)
{
    bool zoomChanged = false;

    sv_frame_t frameCount = getModelsEndFrame() - getModelsStartFrame();
    int zoomLevel = int(frameCount / width());
    if (zoomLevel < 1) zoomLevel = 1;
    zoomLevel = getZoomConstraintBlockSize(zoomLevel,
					   ZoomConstraint::RoundUp);
    if (zoomLevel != m_zoomLevel) {
        zoomChanged = true;
    }

    if (!zoomChanged) {
        if (m_modelTestTime.elapsed() < 1000) {
            for (LayerList::const_iterator i = m_layerStack.begin();
                 i != m_layerStack.end(); ++i) {
                if ((*i)->getModel() &&
                    (!(*i)->getModel()->isOK() ||
                     !(*i)->getModel()->isReady())) {
                    return;
                }
            }
        } else {
            m_modelTestTime.restart();
        }
    }

    View::modelChangedWithin(startFrame, endFrame);
}

void
Overview::modelReplaced()
{
    m_playPointerFrame = getAlignedPlaybackFrame();
    View::modelReplaced();
}

void
Overview::registerView(View *view)
{
    m_views.insert(view);
    update(); 
}

void
Overview::unregisterView(View *view)
{
    m_views.erase(view);
    update();
}

void
Overview::globalCentreFrameChanged(sv_frame_t 
#ifdef DEBUG_OVERVIEW
                                   f
#endif
    )
{
#ifdef DEBUG_OVERVIEW
    cerr << "Overview::globalCentreFrameChanged: " << f << endl;
#endif
    update();
}

void
Overview::viewCentreFrameChanged(View *v, sv_frame_t
#ifdef DEBUG_OVERVIEW
                                 f
#endif
    )
{
#ifdef DEBUG_OVERVIEW
    cerr << "Overview[" << this << "]::viewCentreFrameChanged(" << v << "): " << f << endl;
#endif
    if (m_views.find(v) != m_views.end()) {
	update();
    }
}    

void
Overview::viewZoomLevelChanged(View *v, int, bool)
{
    if (v == this) return;
    if (m_views.find(v) != m_views.end()) {
	update();
    }
}

void
Overview::viewManagerPlaybackFrameChanged(sv_frame_t f)
{
#ifdef DEBUG_OVERVIEW
    cerr << "Overview[" << this << "]::viewManagerPlaybackFrameChanged(" << f << "): " << f << endl;
#endif

    bool changed = false;

    f = getAlignedPlaybackFrame();

    if (getXForFrame(m_playPointerFrame) != getXForFrame(f)) changed = true;
    m_playPointerFrame = f;

    if (changed) update();
}

void
Overview::paintEvent(QPaintEvent *e)
{
    // Recalculate zoom in case the size of the widget has changed.

#ifdef DEBUG_OVERVIEW
    cerr << "Overview::paintEvent: width is " << width() << ", centre frame " << m_centreFrame << endl;
#endif

    sv_frame_t startFrame = getModelsStartFrame();
    sv_frame_t frameCount = getModelsEndFrame() - getModelsStartFrame();
    int zoomLevel = int(frameCount / width());
    if (zoomLevel < 1) zoomLevel = 1;
    zoomLevel = getZoomConstraintBlockSize(zoomLevel,
					   ZoomConstraint::RoundUp);
    if (zoomLevel != m_zoomLevel) {
	m_zoomLevel = zoomLevel;
	emit zoomLevelChanged(m_zoomLevel, m_followZoom);
    }

    sv_frame_t centreFrame = startFrame + m_zoomLevel * (width() / 2);
    if (centreFrame > (startFrame + getModelsEndFrame())/2) {
	centreFrame = (startFrame + getModelsEndFrame())/2;
    }
    if (centreFrame != m_centreFrame) {
#ifdef DEBUG_OVERVIEW
        cerr << "Overview::paintEvent: Centre frame changed from "
                  << m_centreFrame << " to " << centreFrame << " and thus start frame from " << getStartFrame();
#endif
	m_centreFrame = centreFrame;
#ifdef DEBUG_OVERVIEW
        cerr << " to " << getStartFrame() << endl;
#endif
	emit centreFrameChanged(m_centreFrame, false, PlaybackIgnore);
    }

    View::paintEvent(e);

    QPainter paint;
    paint.begin(this);

    QRect r(rect());

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

    paint.setPen(getForeground());

    int y = 0;

    sv_frame_t prevx0 = -10;
    sv_frame_t prevx1 = -10;

    for (ViewSet::iterator i = m_views.begin(); i != m_views.end(); ++i) {
	if (!*i) continue;

	View *w = (View *)*i;

	sv_frame_t f0 = w->getFrameForX(0);
	sv_frame_t f1 = w->getFrameForX(w->width());

        if (f0 >= 0) {
            sv_frame_t rf0 = w->alignToReference(f0);
            f0 = alignFromReference(rf0);
        }
        if (f1 >= 0) {
            sv_frame_t rf1 = w->alignToReference(f1);
            f1 = alignFromReference(rf1);
        }

	int x0 = getXForFrame(f0);
	int x1 = getXForFrame(f1);

	if (x0 != prevx0 || x1 != prevx1) {
	    y += height() / 10 + 1;
	    prevx0 = x0;
	    prevx1 = x1;
	}

	if (x1 <= x0) x1 = x0 + 1;
	
	paint.drawRect(x0, y, x1 - x0, height() - 2 * y);
    }

    paint.end();
}

void
Overview::mousePressEvent(QMouseEvent *e)
{
    m_clickPos = e->pos();
    sv_frame_t clickFrame = getFrameForX(m_clickPos.x());
    if (clickFrame > 0) m_dragCentreFrame = clickFrame;
    else m_dragCentreFrame = 0;
    m_clickedInRange = true;

    for (ViewSet::iterator i = m_views.begin(); i != m_views.end(); ++i) {
	if (*i && (*i)->getAligningModel() == getAligningModel()) {
            m_dragCentreFrame = (*i)->getCentreFrame();
            break;
        }
    }
}

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

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

    int xoff = int(e->x()) - int(m_clickPos.x());
    sv_frame_t frameOff = xoff * m_zoomLevel;
    
    sv_frame_t newCentreFrame = m_dragCentreFrame;
    if (frameOff > 0) {
	newCentreFrame += frameOff;
    } else if (newCentreFrame >= -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) > m_zoomLevel) {
        sv_frame_t rf = alignToReference(newCentreFrame);
#ifdef DEBUG_OVERVIEW
        cerr << "Overview::mouseMoveEvent: x " << e->x() << " and click x " << m_clickPos.x() << " -> frame " << newCentreFrame << " -> rf " << rf << endl;
#endif
        if (m_followPlay == PlaybackScrollContinuous ||
            m_followPlay == PlaybackScrollPageWithCentre) {
            emit centreFrameChanged(rf, true, PlaybackScrollContinuous);
        } else {
            emit centreFrameChanged(rf, true, PlaybackIgnore);
        }            
    }
}

void
Overview::mouseDoubleClickEvent(QMouseEvent *e)
{
    sv_frame_t frame = getFrameForX(e->x());
    sv_frame_t rf = 0;
    if (frame > 0) rf = alignToReference(frame);
#ifdef DEBUG_OVERVIEW
    cerr << "Overview::mouseDoubleClickEvent: frame " << frame << " -> rf " << rf << endl;
#endif
    m_clickedInRange = false; // we're not starting a drag with the second click
    emit centreFrameChanged(rf, true, PlaybackScrollContinuous);
}

void
Overview::enterEvent(QEvent *)
{
    emit contextHelpChanged(tr("Click and drag to navigate; double-click to jump"));
}

void
Overview::leaveEvent(QEvent *)
{
    emit contextHelpChanged("");
}