diff view/Pane.cpp @ 127:89c625dda204

* Reorganising code base.  This revision will not compile.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/view/Pane.cpp	Mon Jul 31 11:44:37 2006 +0000
@@ -0,0 +1,1095 @@
+/* -*- 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.
+    
+    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 "widgets/Pane.h"
+#include "base/Layer.h"
+#include "base/Model.h"
+#include "base/ZoomConstraint.h"
+#include "base/RealTime.h"
+#include "base/Profiler.h"
+#include "base/ViewManager.h"
+#include "base/CommandHistory.h"
+#include "layer/WaveformLayer.h"
+
+#include <QPaintEvent>
+#include <QPainter>
+#include <iostream>
+#include <cmath>
+
+using std::cerr;
+using std::endl;
+
+Pane::Pane(QWidget *w) :
+    View(w, true),
+    m_identifyFeatures(false),
+    m_clickedInRange(false),
+    m_shiftPressed(false),
+    m_ctrlPressed(false),
+    m_navigating(false),
+    m_resizing(false),
+    m_centreLineVisible(true)
+{
+    setObjectName("Pane");
+    setMouseTracking(true);
+}
+
+bool
+Pane::shouldIlluminateLocalFeatures(const Layer *layer, QPoint &pos) const
+{
+    QPoint discard;
+    bool b0, b1;
+
+    if (layer == getSelectedLayer() &&
+	!shouldIlluminateLocalSelection(discard, b0, b1)) {
+
+	pos = m_identifyPoint;
+	return m_identifyFeatures;
+    }
+
+    return false;
+}
+
+bool
+Pane::shouldIlluminateLocalSelection(QPoint &pos,
+				     bool &closeToLeft,
+				     bool &closeToRight) const
+{
+    if (m_identifyFeatures &&
+	m_manager &&
+	m_manager->getToolMode() == ViewManager::EditMode &&
+	!m_manager->getSelections().empty() &&
+	!selectionIsBeingEdited()) {
+
+	Selection s(getSelectionAt(m_identifyPoint.x(),
+				   closeToLeft, closeToRight));
+
+	if (!s.isEmpty()) {
+	    if (getSelectedLayer() && getSelectedLayer()->isLayerEditable()) {
+		
+		pos = m_identifyPoint;
+		return true;
+	    }
+	}
+    }
+
+    return false;
+}
+
+bool
+Pane::selectionIsBeingEdited() const
+{
+    if (!m_editingSelection.isEmpty()) {
+	if (m_mousePos != m_clickPos &&
+	    getFrameForX(m_mousePos.x()) != getFrameForX(m_clickPos.x())) {
+	    return true;
+	}
+    }
+    return false;
+}
+
+void
+Pane::setCentreLineVisible(bool visible)
+{
+    m_centreLineVisible = visible;
+    update();
+}
+
+void
+Pane::paintEvent(QPaintEvent *e)
+{
+//    Profiler profiler("Pane::paintEvent", true);
+
+    QPainter paint;
+
+    QRect r(rect());
+
+    if (e) {
+	r = e->rect();
+    }
+/*
+    paint.begin(this);
+    paint.setClipRect(r);
+
+    if (hasLightBackground()) {
+	paint.setPen(Qt::white);
+	paint.setBrush(Qt::white);
+    } else {
+	paint.setPen(Qt::black);
+	paint.setBrush(Qt::black);
+    }
+    paint.drawRect(r);
+
+    paint.end();
+*/
+    View::paintEvent(e);
+
+    paint.begin(this);
+
+    if (e) {
+	paint.setClipRect(r);
+    }
+
+    const Model *waveformModel = 0; // just for reporting purposes
+    int verticalScaleWidth = 0;
+    
+    int fontHeight = paint.fontMetrics().height();
+    int fontAscent = paint.fontMetrics().ascent();
+
+    if (m_manager &&
+        !m_manager->isPlaying() &&
+        m_manager->getToolMode() == ViewManager::SelectMode) {
+
+        for (LayerList::iterator vi = m_layers.end(); vi != m_layers.begin(); ) {
+            --vi;
+
+            std::vector<QRect> crosshairExtents;
+
+            if ((*vi)->getCrosshairExtents(this, paint, m_identifyPoint,
+                                           crosshairExtents)) {
+                (*vi)->paintCrosshairs(this, paint, m_identifyPoint);
+                break;
+            } else if ((*vi)->isLayerOpaque()) {
+                break;
+            }
+        }
+    }
+
+    for (LayerList::iterator vi = m_layers.end(); vi != m_layers.begin(); ) {
+        --vi;
+            
+        if (dynamic_cast<WaveformLayer *>(*vi)) {
+            waveformModel = (*vi)->getModel();
+        }
+
+        if (!m_manager ||
+            m_manager->getOverlayMode() == ViewManager::NoOverlays) {
+            break;
+        }
+
+        verticalScaleWidth = (*vi)->getVerticalScaleWidth(this, paint);
+
+        if (verticalScaleWidth > 0 && r.left() < verticalScaleWidth) {
+
+//	    Profiler profiler("Pane::paintEvent - painting vertical scale", true);
+
+//	    std::cerr << "Pane::paintEvent: calling paint.save() in vertical scale block" << std::endl;
+            paint.save();
+            
+            paint.setPen(Qt::black);
+            paint.setBrush(Qt::white);
+            paint.drawRect(0, -1, verticalScaleWidth, height()+1);
+            
+            paint.setBrush(Qt::NoBrush);
+            (*vi)->paintVerticalScale
+                (this, paint, QRect(0, 0, verticalScaleWidth, height()));
+            
+            paint.restore();
+        }
+	
+        if (m_identifyFeatures) {
+            
+            QPoint pos = m_identifyPoint;
+            QString desc = (*vi)->getFeatureDescription(this, pos);
+	    
+            if (desc != "") {
+                
+                paint.save();
+                
+                int tabStop =
+                    paint.fontMetrics().width(tr("Some lengthy prefix:"));
+                
+                QRect boundingRect = 
+                    paint.fontMetrics().boundingRect
+                    (rect(),
+                     Qt::AlignRight | Qt::AlignTop | Qt::TextExpandTabs,
+                     desc, tabStop);
+
+                if (hasLightBackground()) {
+                    paint.setPen(Qt::NoPen);
+                    paint.setBrush(QColor(250, 250, 250, 200));
+                } else {
+                    paint.setPen(Qt::NoPen);
+                    paint.setBrush(QColor(50, 50, 50, 200));
+                }
+
+                int extra = paint.fontMetrics().descent();
+                paint.drawRect(width() - boundingRect.width() - 10 - extra,
+                               10 - extra,
+                               boundingRect.width() + 2 * extra,
+                               boundingRect.height() + extra);
+
+                if (hasLightBackground()) {
+                    paint.setPen(QColor(150, 20, 0));
+                } else {
+                    paint.setPen(QColor(255, 150, 100));
+                }
+		
+                QTextOption option;
+                option.setWrapMode(QTextOption::NoWrap);
+                option.setAlignment(Qt::AlignRight | Qt::AlignTop);
+                option.setTabStop(tabStop);
+                paint.drawText(QRectF(width() - boundingRect.width() - 10, 10,
+                                      boundingRect.width(),
+                                      boundingRect.height()),
+                               desc,
+                               option);
+
+                paint.restore();
+            }
+        }
+
+        break;
+    }
+    
+    int sampleRate = getModelsSampleRate();
+    paint.setBrush(Qt::NoBrush);
+
+    if (m_centreLineVisible) {
+
+	if (hasLightBackground()) {
+	    paint.setPen(QColor(50, 50, 50));
+	} else {
+	    paint.setPen(QColor(200, 200, 200));
+	}	
+	paint.drawLine(width() / 2, 0, width() / 2, height() - 1);
+
+	paint.setPen(QColor(50, 50, 50));
+
+	int y = height() - fontHeight
+	    + fontAscent - 6;
+	
+	LayerList::iterator vi = m_layers.end();
+	
+	if (vi != m_layers.begin()) {
+	    
+	    switch ((*--vi)->getPreferredFrameCountPosition()) {
+		
+	    case Layer::PositionTop:
+		y = fontAscent + 6;
+		break;
+		
+	    case Layer::PositionMiddle:
+		y = (height() - fontHeight) / 2
+		    + fontAscent;
+		break;
+
+	    case Layer::PositionBottom:
+		// y already set correctly
+		break;
+	    }
+	}
+
+        if (m_manager &&
+            m_manager->getOverlayMode() != ViewManager::NoOverlays) {
+
+            if (sampleRate) {
+
+                QString text(QString::fromStdString
+                             (RealTime::frame2RealTime
+                              (m_centreFrame, sampleRate).toText(true)));
+                
+                int tw = paint.fontMetrics().width(text);
+                int x = width()/2 - 4 - tw;
+                
+                drawVisibleText(paint, x, y, text, OutlinedText);
+            }
+            
+            QString text = QString("%1").arg(m_centreFrame);
+            
+            int tw = paint.fontMetrics().width(text);
+            int x = width()/2 + 4;
+            
+            drawVisibleText(paint, x, y, text, OutlinedText);
+        }
+
+    } else {
+
+	paint.setPen(QColor(50, 50, 50));
+    }
+
+    if (waveformModel &&
+        m_manager &&
+        m_manager->getOverlayMode() != ViewManager::NoOverlays &&
+	r.y() + r.height() >= height() - fontHeight - 6) {
+
+	size_t mainModelRate = m_manager->getMainModelSampleRate();
+	size_t playbackRate = m_manager->getPlaybackSampleRate();
+	    
+	QString srNote = "";
+
+	// Show (R) for waveform models that will be resampled on
+	// playback, and (X) for waveform models that will be played
+	// at the wrong rate because their rate differs from that of
+	// the main model.
+
+	if (sampleRate == mainModelRate) {
+	    if (sampleRate != playbackRate) srNote = " " + tr("(R)");
+	} else {
+	    std::cerr << "Sample rate = " << sampleRate << ", main model rate = " << mainModelRate << std::endl;
+	    srNote = " " + tr("(X)");
+	}
+
+	QString desc = tr("%1 / %2Hz%3")
+	    .arg(RealTime::frame2RealTime(waveformModel->getEndFrame(),
+					  sampleRate)
+		 .toText(false).c_str())
+	    .arg(sampleRate)
+	    .arg(srNote);
+
+	if (r.x() < verticalScaleWidth + 5 + paint.fontMetrics().width(desc)) {
+	    drawVisibleText(paint, verticalScaleWidth + 5,
+			    height() - fontHeight + fontAscent - 6,
+			    desc, OutlinedText);
+	}
+    }
+
+    if (m_manager &&
+        m_manager->getOverlayMode() == ViewManager::AllOverlays &&
+        r.y() + r.height() >= height() - m_layers.size() * fontHeight - 6) {
+
+	std::vector<QString> texts;
+	int maxTextWidth = 0;
+
+	for (LayerList::iterator i = m_layers.begin(); i != m_layers.end(); ++i) {
+
+	    QString text = (*i)->getLayerPresentationName();
+	    int tw = paint.fontMetrics().width(text);
+            bool reduced = false;
+            while (tw > width() / 3 && text.length() > 4) {
+                if (!reduced && text.length() > 8) {
+                    text = text.left(text.length() - 4);
+                } else {
+                    text = text.left(text.length() - 2);
+                }
+                reduced = true;
+                tw = paint.fontMetrics().width(text + "...");
+            }
+            if (reduced) {
+                texts.push_back(text + "...");
+            } else {
+                texts.push_back(text);
+            }
+	    if (tw > maxTextWidth) maxTextWidth = tw;
+	}
+    
+	int lly = height() - 6;
+
+	if (r.x() + r.width() >= width() - maxTextWidth - 5) {
+	    
+	    for (int i = 0; i < texts.size(); ++i) {
+
+		if (i == texts.size() - 1) {
+		    paint.setPen(Qt::black);
+		}
+		
+		drawVisibleText(paint, width() - maxTextWidth - 5,
+				lly - fontHeight + fontAscent,
+				texts[i], OutlinedText);
+		
+		lly -= fontHeight;
+	    }
+	}
+    }
+
+    if (m_clickedInRange && m_shiftPressed) {
+	if (m_manager && (m_manager->getToolMode() == ViewManager::NavigateMode)) {
+	    //!!! be nice if this looked a bit more in keeping with the
+	    //selection block
+	    paint.setPen(Qt::blue);
+	    paint.drawRect(m_clickPos.x(), m_clickPos.y(),
+			   m_mousePos.x() - m_clickPos.x(),
+			   m_mousePos.y() - m_clickPos.y());
+	}
+    }
+    
+    if (selectionIsBeingEdited()) {
+
+	int offset = m_mousePos.x() - m_clickPos.x();
+	int p0 = getXForFrame(m_editingSelection.getStartFrame()) + offset;
+	int p1 = getXForFrame(m_editingSelection.getEndFrame()) + offset;
+
+	if (m_editingSelectionEdge < 0) {
+	    p1 = getXForFrame(m_editingSelection.getEndFrame());
+	} else if (m_editingSelectionEdge > 0) {
+	    p0 = getXForFrame(m_editingSelection.getStartFrame());
+	}
+
+	paint.save();
+	if (hasLightBackground()) {
+	    paint.setPen(QPen(Qt::black, 2));
+	} else {
+	    paint.setPen(QPen(Qt::white, 2));
+	}
+
+	//!!! duplicating display policy with View::drawSelections
+
+	if (m_editingSelectionEdge < 0) {
+	    paint.drawLine(p0, 1, p1, 1);
+	    paint.drawLine(p0, 0, p0, height());
+	    paint.drawLine(p0, height() - 1, p1, height() - 1);
+	} else if (m_editingSelectionEdge > 0) {
+	    paint.drawLine(p0, 1, p1, 1);
+	    paint.drawLine(p1, 0, p1, height());
+	    paint.drawLine(p0, height() - 1, p1, height() - 1);
+	} else {
+	    paint.setBrush(Qt::NoBrush);
+	    paint.drawRect(p0, 1, p1 - p0, height() - 2);
+	}
+	paint.restore();
+    }
+
+    paint.end();
+}
+
+Selection
+Pane::getSelectionAt(int x, bool &closeToLeftEdge, bool &closeToRightEdge) const
+{
+    closeToLeftEdge = closeToRightEdge = false;
+
+    if (!m_manager) return Selection();
+
+    long testFrame = getFrameForX(x - 5);
+    if (testFrame < 0) {
+	testFrame = getFrameForX(x);
+	if (testFrame < 0) return Selection();
+    }
+
+    Selection selection = m_manager->getContainingSelection(testFrame, true);
+    if (selection.isEmpty()) return selection;
+
+    int lx = getXForFrame(selection.getStartFrame());
+    int rx = getXForFrame(selection.getEndFrame());
+    
+    int fuzz = 2;
+    if (x < lx - fuzz || x > rx + fuzz) return Selection();
+
+    int width = rx - lx;
+    fuzz = 3;
+    if (width < 12) fuzz = width / 4;
+    if (fuzz < 1) fuzz = 1;
+
+    if (x < lx + fuzz) closeToLeftEdge = true;
+    if (x > rx - fuzz) closeToRightEdge = true;
+
+    return selection;
+}
+
+void
+Pane::mousePressEvent(QMouseEvent *e)
+{
+    if (e->buttons() & Qt::RightButton) {
+        emit rightButtonMenuRequested(mapToGlobal(e->pos()));
+        return;
+    }
+
+    m_clickPos = e->pos();
+    m_clickedInRange = true;
+    m_editingSelection = Selection();
+    m_editingSelectionEdge = 0;
+    m_shiftPressed = (e->modifiers() & Qt::ShiftModifier);
+    m_ctrlPressed = (e->modifiers() & Qt::ControlModifier);
+
+    ViewManager::ToolMode mode = ViewManager::NavigateMode;
+    if (m_manager) mode = m_manager->getToolMode();
+
+    m_navigating = false;
+
+    if (mode == ViewManager::NavigateMode || (e->buttons() & Qt::MidButton)) {
+
+	if (mode != ViewManager::NavigateMode) {
+	    setCursor(Qt::PointingHandCursor);
+	}
+
+	m_navigating = true;
+	m_dragCentreFrame = m_centreFrame;
+
+    } else if (mode == ViewManager::SelectMode) {
+
+	bool closeToLeft = false, closeToRight = false;
+	Selection selection = getSelectionAt(e->x(), closeToLeft, closeToRight);
+
+	if ((closeToLeft || closeToRight) && !(closeToLeft && closeToRight)) {
+
+	    m_manager->removeSelection(selection);
+
+	    if (closeToLeft) {
+		m_selectionStartFrame = selection.getEndFrame();
+	    } else {
+		m_selectionStartFrame = selection.getStartFrame();
+	    }
+
+	    m_manager->setInProgressSelection(selection, false);
+	    m_resizing = true;
+	
+	} else {
+
+	    int mouseFrame = getFrameForX(e->x());
+	    size_t resolution = 1;
+	    int snapFrame = mouseFrame;
+	
+	    Layer *layer = getSelectedLayer();
+	    if (layer && !m_shiftPressed) {
+		layer->snapToFeatureFrame(this, snapFrame,
+					  resolution, Layer::SnapLeft);
+	    }
+	    
+	    if (snapFrame < 0) snapFrame = 0;
+	    m_selectionStartFrame = snapFrame;
+	    if (m_manager) {
+		m_manager->setInProgressSelection(Selection(snapFrame,
+							    snapFrame + resolution),
+						  !m_ctrlPressed);
+	    }
+
+	    m_resizing = false;
+	}
+
+	update();
+
+    } else if (mode == ViewManager::DrawMode) {
+
+	Layer *layer = getSelectedLayer();
+	if (layer && layer->isLayerEditable()) {
+	    layer->drawStart(this, e);
+	}
+
+    } else if (mode == ViewManager::EditMode) {
+
+	if (!editSelectionStart(e)) {
+	    Layer *layer = getSelectedLayer();
+	    if (layer && layer->isLayerEditable()) {
+		layer->editStart(this, e);
+	    }
+	}
+    }
+
+    emit paneInteractedWith();
+}
+
+void
+Pane::mouseReleaseEvent(QMouseEvent *e)
+{
+    if (e->buttons() & Qt::RightButton) {
+        return;
+    }
+
+    ViewManager::ToolMode mode = ViewManager::NavigateMode;
+    if (m_manager) mode = m_manager->getToolMode();
+
+    if (m_clickedInRange) {
+	mouseMoveEvent(e);
+    }
+
+    if (m_navigating || mode == ViewManager::NavigateMode) {
+
+	m_navigating = false;
+
+	if (mode != ViewManager::NavigateMode) {
+	    // restore cursor
+	    toolModeChanged();
+	}
+
+	if (m_shiftPressed) {
+
+	    int x0 = std::min(m_clickPos.x(), m_mousePos.x());
+	    int x1 = std::max(m_clickPos.x(), m_mousePos.x());
+	    int w = x1 - x0;
+
+	    int y0 = std::min(m_clickPos.y(), m_mousePos.y());
+	    int y1 = std::max(m_clickPos.y(), m_mousePos.y());
+//	    int h = y1 - y0;
+	    
+	    long newStartFrame = getFrameForX(x0);
+	    
+	    long visibleFrames = getEndFrame() - getStartFrame();
+	    if (newStartFrame <= -visibleFrames) {
+		newStartFrame  = -visibleFrames + 1;
+	    }
+	    
+	    if (newStartFrame >= long(getModelsEndFrame())) {
+		newStartFrame  = getModelsEndFrame() - 1;
+	    }
+	    
+	    float ratio = float(w) / float(width());
+//	std::cerr << "ratio: " << ratio << std::endl;
+	    size_t newZoomLevel = (size_t)nearbyint(m_zoomLevel * ratio);
+	    if (newZoomLevel < 1) newZoomLevel = 1;
+
+//	std::cerr << "start: " << m_startFrame << ", level " << m_zoomLevel << std::endl;
+	    setZoomLevel(getZoomConstraintBlockSize(newZoomLevel));
+	    setStartFrame(newStartFrame);
+
+            //!!! lots of faff, shouldn't be here
+
+            QString unit;
+            float min, max;
+            bool log;
+            Layer *layer = 0;
+            for (LayerList::const_iterator i = m_layers.begin();
+                 i != m_layers.end(); ++i) { 
+                if ((*i)->getValueExtents(min, max, log, unit) &&
+                    (*i)->getDisplayExtents(min, max)) {
+                    layer = *i;
+                    break;
+                }
+            }
+            
+            if (layer) {
+                if (log) {
+                    min = (min < 0.0) ? -log10f(-min) : (min == 0.0) ? 0.0 : log10f(min);
+                    max = (max < 0.0) ? -log10f(-max) : (max == 0.0) ? 0.0 : log10f(max);
+                }
+                float rmin = min + ((max - min) * (height() - y1)) / height();
+                float rmax = min + ((max - min) * (height() - y0)) / height();
+                std::cerr << "min: " << min << ", max: " << max << ", y0: " << y0 << ", y1: " << y1 << ", h: " << height() << ", rmin: " << rmin << ", rmax: " << rmax << std::endl;
+                if (log) {
+                    rmin = powf(10, rmin);
+                    rmax = powf(10, rmax);
+                }
+                std::cerr << "finally: rmin: " << rmin << ", rmax: " << rmax << " " << unit.toStdString() << std::endl;
+
+                layer->setDisplayExtents(rmin, rmax);
+            }
+                
+	    //cerr << "mouseReleaseEvent: start frame now " << m_startFrame << endl;
+//	update();
+	}
+
+    } else if (mode == ViewManager::SelectMode) {
+
+	if (m_manager && m_manager->haveInProgressSelection()) {
+
+	    bool exclusive;
+	    Selection selection = m_manager->getInProgressSelection(exclusive);
+	    
+	    if (selection.getEndFrame() < selection.getStartFrame() + 2) {
+		selection = Selection();
+	    }
+	    
+	    m_manager->clearInProgressSelection();
+	    
+	    if (exclusive) {
+		m_manager->setSelection(selection);
+	    } else {
+		m_manager->addSelection(selection);
+	    }
+	}
+	
+	update();
+
+    } else if (mode == ViewManager::DrawMode) {
+
+	Layer *layer = getSelectedLayer();
+	if (layer && layer->isLayerEditable()) {
+	    layer->drawEnd(this, e);
+	    update();
+	}
+
+    } else if (mode == ViewManager::EditMode) {
+
+	if (!editSelectionEnd(e)) {
+	    Layer *layer = getSelectedLayer();
+	    if (layer && layer->isLayerEditable()) {
+		layer->editEnd(this, e);
+		update();
+	    }
+	}
+    }
+
+    m_clickedInRange = false;
+
+    emit paneInteractedWith();
+}
+
+void
+Pane::mouseMoveEvent(QMouseEvent *e)
+{
+    if (e->buttons() & Qt::RightButton) {
+        return;
+    }
+
+    ViewManager::ToolMode mode = ViewManager::NavigateMode;
+    if (m_manager) mode = m_manager->getToolMode();
+
+    QPoint prevPoint = m_identifyPoint;
+    m_identifyPoint = e->pos();
+
+    if (!m_clickedInRange) {
+	
+	if (mode == ViewManager::SelectMode) {
+	    bool closeToLeft = false, closeToRight = false;
+	    getSelectionAt(e->x(), closeToLeft, closeToRight);
+	    if ((closeToLeft || closeToRight) && !(closeToLeft && closeToRight)) {
+		setCursor(Qt::SizeHorCursor);
+	    } else {
+		setCursor(Qt::ArrowCursor);
+	    }
+	}
+
+//!!!	if (mode != ViewManager::DrawMode) {
+
+        if (!m_manager->isPlaying()) {
+
+	if (getSelectedLayer()) {
+
+	    bool previouslyIdentifying = m_identifyFeatures;
+	    m_identifyFeatures = true;
+	    
+	    if (m_identifyFeatures != previouslyIdentifying ||
+		m_identifyPoint != prevPoint) {
+		update();
+	    }
+	}
+
+        }
+
+//	}
+
+	return;
+    }
+
+    if (m_navigating || mode == ViewManager::NavigateMode) {
+
+	if (m_shiftPressed) {
+
+	    m_mousePos = e->pos();
+	    update();
+
+	} else {
+
+	    long frameOff = getFrameForX(e->x()) - getFrameForX(m_clickPos.x());
+
+	    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 (getXForFrame(m_centreFrame) != getXForFrame(newCentreFrame)) {
+		setCentreFrame(newCentreFrame);
+	    }
+	}
+
+    } else if (mode == ViewManager::SelectMode) {
+
+	int mouseFrame = getFrameForX(e->x());
+	size_t resolution = 1;
+	int snapFrameLeft = mouseFrame;
+	int snapFrameRight = mouseFrame;
+	
+	Layer *layer = getSelectedLayer();
+	if (layer && !m_shiftPressed) {
+	    layer->snapToFeatureFrame(this, snapFrameLeft,
+				      resolution, Layer::SnapLeft);
+	    layer->snapToFeatureFrame(this, snapFrameRight,
+				      resolution, Layer::SnapRight);
+	}
+	
+//	std::cerr << "snap: frame = " << mouseFrame << ", start frame = " << m_selectionStartFrame << ", left = " << snapFrameLeft << ", right = " << snapFrameRight << std::endl;
+
+	if (snapFrameLeft < 0) snapFrameLeft = 0;
+	if (snapFrameRight < 0) snapFrameRight = 0;
+	
+	size_t min, max;
+	
+	if (m_selectionStartFrame > snapFrameLeft) {
+	    min = snapFrameLeft;
+	    max = m_selectionStartFrame;
+	} else if (snapFrameRight > m_selectionStartFrame) {
+	    min = m_selectionStartFrame;
+	    max = snapFrameRight;
+	} else {
+	    min = snapFrameLeft;
+	    max = snapFrameRight;
+	}
+
+	if (m_manager) {
+	    m_manager->setInProgressSelection(Selection(min, max),
+					      !m_resizing && !m_ctrlPressed);
+	}
+
+	bool doScroll = false;
+	if (!m_manager) doScroll = true;
+	if (!m_manager->isPlaying()) doScroll = true;
+	if (m_followPlay != PlaybackScrollContinuous) doScroll = true;
+
+	if (doScroll) {
+	    int offset = mouseFrame - getStartFrame();
+	    int available = getEndFrame() - getStartFrame();
+	    if (offset >= available * 0.95) {
+		int move = int(offset - available * 0.95) + 1;
+		setCentreFrame(m_centreFrame + move);
+	    } else if (offset <= available * 0.10) {
+		int move = int(available * 0.10 - offset) + 1;
+		if (m_centreFrame > move) {
+		    setCentreFrame(m_centreFrame - move);
+		} else {
+		    setCentreFrame(0);
+		}
+	    }
+	}
+
+	update();
+
+    } else if (mode == ViewManager::DrawMode) {
+
+	Layer *layer = getSelectedLayer();
+	if (layer && layer->isLayerEditable()) {
+	    layer->drawDrag(this, e);
+	}
+
+    } else if (mode == ViewManager::EditMode) {
+
+	if (!editSelectionDrag(e)) {
+	    Layer *layer = getSelectedLayer();
+	    if (layer && layer->isLayerEditable()) {
+		layer->editDrag(this, e);
+	    }
+	}
+    }
+}
+
+void
+Pane::mouseDoubleClickEvent(QMouseEvent *e)
+{
+    if (e->buttons() & Qt::RightButton) {
+        return;
+    }
+
+//    std::cerr << "mouseDoubleClickEvent" << std::endl;
+
+    m_clickPos = e->pos();
+    m_clickedInRange = true;
+    m_shiftPressed = (e->modifiers() & Qt::ShiftModifier);
+    m_ctrlPressed = (e->modifiers() & Qt::ControlModifier);
+
+    ViewManager::ToolMode mode = ViewManager::NavigateMode;
+    if (m_manager) mode = m_manager->getToolMode();
+
+    if (mode == ViewManager::NavigateMode ||
+        mode == ViewManager::EditMode) {
+
+	Layer *layer = getSelectedLayer();
+	if (layer && layer->isLayerEditable()) {
+	    layer->editOpen(this, e);
+	}
+    }
+}
+
+void
+Pane::leaveEvent(QEvent *)
+{
+    bool previouslyIdentifying = m_identifyFeatures;
+    m_identifyFeatures = false;
+    if (previouslyIdentifying) update();
+}
+
+void
+Pane::wheelEvent(QWheelEvent *e)
+{
+    //std::cerr << "wheelEvent, delta " << e->delta() << std::endl;
+
+    int count = e->delta();
+
+    if (count > 0) {
+	if (count >= 120) count /= 120;
+	else count = 1;
+    } 
+
+    if (count < 0) {
+	if (count <= -120) count /= 120;
+	else count = -1;
+    }
+
+    if (e->modifiers() & Qt::ControlModifier) {
+
+	// Scroll left or right, rapidly
+
+	if (getStartFrame() < 0 && 
+	    getEndFrame() >= getModelsEndFrame()) return;
+
+	long delta = ((width() / 2) * count * m_zoomLevel);
+
+	if (int(m_centreFrame) < delta) {
+	    setCentreFrame(0);
+	} else if (int(m_centreFrame) - delta >= int(getModelsEndFrame())) {
+	    setCentreFrame(getModelsEndFrame());
+	} else {
+	    setCentreFrame(m_centreFrame - delta);
+	}
+
+    } else {
+
+	// Zoom in or out
+
+	int newZoomLevel = m_zoomLevel;
+  
+	while (count > 0) {
+	    if (newZoomLevel <= 2) {
+		newZoomLevel = 1;
+		break;
+	    }
+	    newZoomLevel = getZoomConstraintBlockSize(newZoomLevel - 1, 
+						      ZoomConstraint::RoundDown);
+	    --count;
+	}
+	
+	while (count < 0) {
+	    newZoomLevel = getZoomConstraintBlockSize(newZoomLevel + 1,
+						      ZoomConstraint::RoundUp);
+	    ++count;
+	}
+	
+	if (newZoomLevel != m_zoomLevel) {
+	    setZoomLevel(newZoomLevel);
+	}
+    }
+
+    emit paneInteractedWith();
+}
+
+bool
+Pane::editSelectionStart(QMouseEvent *e)
+{
+    if (!m_identifyFeatures ||
+	!m_manager ||
+	m_manager->getToolMode() != ViewManager::EditMode) {
+	return false;
+    }
+
+    bool closeToLeft, closeToRight;
+    Selection s(getSelectionAt(e->x(), closeToLeft, closeToRight));
+    if (s.isEmpty()) return false;
+    m_editingSelection = s;
+    m_editingSelectionEdge = (closeToLeft ? -1 : closeToRight ? 1 : 0);
+    m_mousePos = e->pos();
+    return true;
+}
+
+bool
+Pane::editSelectionDrag(QMouseEvent *e)
+{
+    if (m_editingSelection.isEmpty()) return false;
+    m_mousePos = e->pos();
+    update();
+    return true;
+}
+
+bool
+Pane::editSelectionEnd(QMouseEvent *e)
+{
+    if (m_editingSelection.isEmpty()) return false;
+
+    int offset = m_mousePos.x() - m_clickPos.x();
+    Layer *layer = getSelectedLayer();
+
+    if (offset == 0 || !layer) {
+	m_editingSelection = Selection();
+	return true;
+    }
+
+    int p0 = getXForFrame(m_editingSelection.getStartFrame()) + offset;
+    int p1 = getXForFrame(m_editingSelection.getEndFrame()) + offset;
+
+    long f0 = getFrameForX(p0);
+    long f1 = getFrameForX(p1);
+
+    Selection newSelection(f0, f1);
+    
+    if (m_editingSelectionEdge == 0) {
+	
+        CommandHistory::getInstance()->startCompoundOperation
+            (tr("Drag Selection"), true);
+
+	layer->moveSelection(m_editingSelection, f0);
+	
+    } else {
+	
+        CommandHistory::getInstance()->startCompoundOperation
+            (tr("Resize Selection"), true);
+
+	if (m_editingSelectionEdge < 0) {
+	    f1 = m_editingSelection.getEndFrame();
+	} else {
+	    f0 = m_editingSelection.getStartFrame();
+	}
+
+	newSelection = Selection(f0, f1);
+	layer->resizeSelection(m_editingSelection, newSelection);
+    }
+    
+    m_manager->removeSelection(m_editingSelection);
+    m_manager->addSelection(newSelection);
+
+    CommandHistory::getInstance()->endCompoundOperation();
+
+    m_editingSelection = Selection();
+    return true;
+}
+
+void
+Pane::toolModeChanged()
+{
+    ViewManager::ToolMode mode = m_manager->getToolMode();
+//    std::cerr << "Pane::toolModeChanged(" << mode << ")" << std::endl;
+
+    switch (mode) {
+
+    case ViewManager::NavigateMode:
+	setCursor(Qt::PointingHandCursor);
+	break;
+	
+    case ViewManager::SelectMode:
+	setCursor(Qt::ArrowCursor);
+	break;
+	
+    case ViewManager::EditMode:
+	setCursor(Qt::UpArrowCursor);
+	break;
+	
+    case ViewManager::DrawMode:
+	setCursor(Qt::CrossCursor);
+	break;
+/*	
+    case ViewManager::TextMode:
+	setCursor(Qt::IBeamCursor);
+	break;
+*/
+    }
+}
+
+QString
+Pane::toXmlString(QString indent, QString extraAttributes) const
+{
+    return View::toXmlString
+	(indent,
+	 QString("type=\"pane\" centreLineVisible=\"%1\" height=\"%2\" %3")
+	 .arg(m_centreLineVisible).arg(height()).arg(extraAttributes));
+}
+
+
+#ifdef INCLUDE_MOCFILES
+#include "Pane.moc.cpp"
+#endif
+