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diff --git a/src/gui/editors/matrix/MatrixCanvasView.cpp b/src/gui/editors/matrix/MatrixCanvasView.cpp
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+++ b/src/gui/editors/matrix/MatrixCanvasView.cpp
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+ 
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+ 
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+ 
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+ 
+    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 "MatrixCanvasView.h"
+
+#include "base/SnapGrid.h"
+#include "gui/general/MidiPitchLabel.h"
+#include "gui/general/RosegardenCanvasView.h"
+#include "MatrixElement.h"
+#include "MatrixStaff.h"
+#include "QCanvasMatrixRectangle.h"
+#include "QCanvasMatrixDiamond.h"
+#include <qcanvas.h>
+#include <qpoint.h>
+#include <qwidget.h>
+#include "misc/Debug.h"
+
+
+
+namespace Rosegarden
+{
+
+MatrixCanvasView::MatrixCanvasView(MatrixStaff& staff,
+                                   SnapGrid *snapGrid,
+                                   bool drumMode,
+                                   QCanvas *viewing, QWidget *parent,
+                                   const char *name, WFlags f)
+        : RosegardenCanvasView(viewing, parent, name, f),
+        m_staff(staff),
+        m_snapGrid(snapGrid),
+        m_drumMode(drumMode),
+        m_previousEvTime(0),
+        m_previousEvPitch(0),
+        m_mouseWasPressed(false),
+        m_ignoreClick(false),
+        m_smoothModifier(Qt::ShiftButton),
+        m_lastSnap(SnapGrid::SnapToBeat),
+        m_isSnapTemporary(false)
+{
+    viewport()->setMouseTracking(true);
+}
+
+MatrixCanvasView::~MatrixCanvasView()
+{}
+
+void MatrixCanvasView::contentsMousePressEvent(QMouseEvent* e)
+{
+    QPoint p = inverseMapPoint(e->pos());
+
+    updateGridSnap(e);
+
+    MATRIX_DEBUG << "MatrixCanvasView::contentsMousePressEvent: snap time is " << m_snapGrid->getSnapTime(double(p.x())) << endl;
+
+    timeT evTime;
+
+    if (m_drumMode) {
+        evTime = m_snapGrid->snapX(p.x(), SnapGrid::SnapEither);
+        MATRIX_DEBUG << "MatrixCanvasView: drum mode: snapEither " << p.x() << " -> " << evTime << endl;
+    } else {
+        evTime = m_snapGrid->snapX(p.x(), SnapGrid::SnapLeft);
+        MATRIX_DEBUG << "MatrixCanvasView: normal mode: snapLeft " << p.x() << " -> " << evTime << endl;
+    }
+
+    int evPitch = m_staff.getHeightAtCanvasCoords(p.x(), p.y());
+
+    timeT emTime = m_staff.getSegment().getEndMarkerTime();
+    if (evTime > emTime)
+        evTime = emTime;
+    timeT esTime = m_staff.getSegment().getStartTime();
+    if (evTime < esTime)
+        evTime = esTime;
+
+//    std::cerr << "MatrixCanvasView::contentsMousePressEvent() at pitch "
+//              << evPitch << ", time " << evTime << std::endl;
+
+    QCanvasItemList itemList = canvas()->collisions(p);
+    QCanvasItemList::Iterator it;
+    MatrixElement* mel = 0;
+    QCanvasItem* activeItem = 0;
+
+    for (it = itemList.begin(); it != itemList.end(); ++it) {
+
+        QCanvasItem *item = *it;
+
+        QCanvasMatrixRectangle *mRect = 0;
+
+        if (item->active()) {
+            activeItem = item;
+            break;
+        }
+
+        if ((mRect = dynamic_cast<QCanvasMatrixRectangle*>(item))) {
+
+//            std::cerr << "MatrixCanvasView: looking at element with rect " << mRect->rect().x() << "," << mRect->rect().y() << " (" << mRect->rect().width() << "x" << mRect->rect().height() << ")" << std::endl;
+
+//            std::cerr << "MatrixCanvasView: point is " << p.x() << "," << p.y()<< std::endl;
+
+            QRect rect = mRect->rect();
+            if (dynamic_cast<QCanvasMatrixDiamond*>(mRect)) {
+                rect = QRect(rect.x() - rect.height()/2,
+                             rect.y(),
+                             rect.width(),
+                             rect.height());
+            }
+
+//            std::cerr << "MatrixCanvasView: adjusted rect " << rect.x() << "," << rect.y() << " (" << rect.width() << "x" << rect.height() << ")" << std::endl;
+
+            // QCanvas::collisions() can be a bit optimistic and report
+            // items which are close to the point but not actually under it.
+            // So a little sanity check helps.
+            if (!rect.contains(p, true)) continue;
+
+            mel = &(mRect->getMatrixElement());
+//            std::cerr << "MatrixCanvasView::contentsMousePressEvent: collision with an existing matrix element" << std::endl;
+            break;
+        }
+    }
+
+    if (activeItem) { // active item takes precedence over notation elements
+        emit activeItemPressed(e, activeItem);
+        m_mouseWasPressed = true;
+        return ;
+    }
+
+    emit mousePressed(evTime, evPitch, e, mel);
+    m_mouseWasPressed = true;
+
+    // Ignore click if it was above the staff and not
+    // on an active item
+    //
+    if (!m_staff.containsCanvasCoords(p.x(), p.y()) && !activeItem)
+        m_ignoreClick = true;
+}
+
+void MatrixCanvasView::contentsMouseMoveEvent(QMouseEvent* e)
+{
+    QPoint p = inverseMapPoint(e->pos());
+    /*
+        if (m_snapGrid->getSnapTime(double(p.x())))
+            m_lastSnap = m_snapGrid->getSnapTime(double(p.x()));
+    */
+    updateGridSnap(e);
+
+    if (m_ignoreClick)
+        return ;
+
+    timeT evTime;
+    if (m_drumMode) {
+        evTime = m_snapGrid->snapX(p.x(), SnapGrid::SnapEither);
+    } else {
+        evTime = m_snapGrid->snapX(p.x(), SnapGrid::SnapLeft);
+    }
+
+    int evPitch = m_staff.getHeightAtCanvasCoords(p.x(), p.y());
+
+    timeT emTime = m_staff.getSegment().getEndMarkerTime();
+    if (evTime > emTime)
+        evTime = emTime;
+
+    timeT stTime = m_staff.getSegment().getStartTime();
+    if (evTime < stTime)
+        evTime = stTime;
+
+    if (evTime != m_previousEvTime) {
+        emit hoveredOverAbsoluteTimeChanged(evTime);
+        m_previousEvTime = evTime;
+    }
+
+    QCanvasItemList itemList = canvas()->collisions(p);
+    MatrixElement* mel = 0;
+
+    for (QCanvasItemList::iterator it = itemList.begin();
+            it != itemList.end(); ++it) {
+
+        QCanvasItem *item = *it;
+        QCanvasMatrixRectangle *mRect = 0;
+
+        if ((mRect = dynamic_cast<QCanvasMatrixRectangle*>(item))) {
+            if (!mRect->rect().contains(p, true))
+                continue;
+            mel = &(mRect->getMatrixElement());
+            MATRIX_DEBUG << "have element" << endl;
+            break;
+        }
+    }
+
+    if (!m_mouseWasPressed && // if mouse pressed, leave this to the tool
+        (evPitch != m_previousEvPitch || mel)) {
+        MidiPitchLabel label(evPitch);
+        if (mel) {
+            emit hoveredOverNoteChanged(evPitch, true,
+                                        mel->event()->getAbsoluteTime());
+        } else {
+            emit hoveredOverNoteChanged(evPitch, false, 0);
+        }
+        m_previousEvPitch = evPitch;
+    }
+
+//    if (m_mouseWasPressed)
+        emit mouseMoved(evTime, evPitch, e);
+
+}
+
+void MatrixCanvasView::contentsMouseDoubleClickEvent (QMouseEvent* e)
+{
+    QPoint p = inverseMapPoint(e->pos());
+
+    if (!m_staff.containsCanvasCoords(p.x(), p.y())) {
+        m_ignoreClick = true;
+        return ;
+    }
+
+    contentsMousePressEvent(e);
+}
+
+void MatrixCanvasView::contentsMouseReleaseEvent(QMouseEvent* e)
+{
+    QPoint p = inverseMapPoint(e->pos());
+
+    if (m_ignoreClick) {
+        m_ignoreClick = false;
+        return ;
+    }
+
+    timeT evTime;
+    if (m_drumMode) {
+        evTime = m_snapGrid->snapX(p.x(), SnapGrid::SnapEither);
+    } else {
+        evTime = m_snapGrid->snapX(p.x(), SnapGrid::SnapLeft);
+    }
+
+    int evPitch = m_staff.getHeightAtCanvasCoords(p.x(), p.y());
+
+    timeT emTime = m_staff.getSegment().getEndMarkerTime();
+    if (evTime > emTime)
+        evTime = emTime;
+
+    emit mouseReleased(evTime, evPitch, e);
+    m_mouseWasPressed = false;
+}
+
+void MatrixCanvasView::slotExternalWheelEvent(QWheelEvent* e)
+{
+    wheelEvent(e);
+}
+
+void MatrixCanvasView::updateGridSnap(QMouseEvent *e)
+{
+    Qt::ButtonState bs = e->state();
+
+    //    MATRIX_DEBUG << "MatrixCanvasView::updateGridSnap : bs = "
+    //		 << bs << " - sm = " << getSmoothModifier() << ", is temporary " << m_isSnapTemporary << ", saved is " << m_lastSnap << endl;
+
+    if (bs & getSmoothModifier()) {
+
+        if (!m_isSnapTemporary) {
+            m_lastSnap = m_snapGrid->getSnapSetting();
+        }
+        m_snapGrid->setSnapTime(SnapGrid::NoSnap);
+        m_isSnapTemporary = true;
+
+    } else if (m_isSnapTemporary) {
+
+        m_snapGrid->setSnapTime(m_lastSnap);
+        m_isSnapTemporary = false;
+    }
+}
+
+void MatrixCanvasView::enterEvent(QEvent *e)
+{
+    emit mouseEntered();
+}
+
+void MatrixCanvasView::leaveEvent(QEvent *e)
+{
+    emit mouseLeft();
+}
+
+}
+#include "MatrixCanvasView.moc"