Chris@57: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
cannam@45: 
cannam@45: /*
Chris@57:     EasyMercurial
Chris@57: 
Chris@57:     Based on HgExplorer by Jari Korhonen
Chris@57:     Copyright (c) 2010 Jari Korhonen
Chris@57:     Copyright (c) 2010 Chris Cannam
Chris@57:     Copyright (c) 2010 Queen Mary, University of London
Chris@57:     
cannam@45:     This program is free software; you can redistribute it and/or
cannam@45:     modify it under the terms of the GNU General Public License as
cannam@45:     published by the Free Software Foundation; either version 2 of the
cannam@45:     License, or (at your option) any later version.  See the file
cannam@45:     COPYING included with this distribution for more information.
cannam@45: */
cannam@45: 
cannam@45: #include "panner.h"
cannam@45: #include "panned.h"
Chris@113: #include "debug.h"
cannam@45: 
cannam@45: #include <QPolygon>
cannam@45: #include <QMouseEvent>
cannam@45: #include <QColor>
cannam@45: 
cannam@45: #include <iostream>
cannam@45: 
cannam@45: class PannerScene : public QGraphicsScene
cannam@45: {
cannam@45: public:
cannam@45:     friend class Panner;
cannam@45: };
cannam@45: 
cannam@45: Panner::Panner() :
cannam@45:     m_clicked(false)
cannam@45: {
cannam@45:     setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
cannam@45:     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
Chris@48:     setOptimizationFlags(QGraphicsView::DontSavePainterState |
Chris@48:                          QGraphicsView::IndirectPainting);
cannam@45:     setMouseTracking(true);
cannam@45:     setInteractive(false);
cannam@45: }
cannam@45: 
cannam@45: void
Chris@113: Panner::fit(QRectF r)
Chris@113: {
Chris@113:     Qt::AspectRatioMode m = Qt::IgnoreAspectRatio;
Chris@113:     if (height() > width()) {
Chris@113:         // Our panner is vertical; if the source is not tall,
Chris@113:         // don't stretch it to fit in the height, it'd look weird
Chris@113:         if (r.height() < height() * 2) {
Chris@113:             m = Qt::KeepAspectRatio;
Chris@113:         }
Chris@113:     } else {
Chris@113:         // Similarly, but horizontal
Chris@113:         if (r.width() < width() * 2) {
Chris@113:             m = Qt::KeepAspectRatio;
Chris@113:         }
Chris@113:     }
Chris@113:     DEBUG << "Panner: fit mode " << m << endl;
Chris@113:     fitInView(r, m);
Chris@113: }
Chris@113: 
Chris@113: void
cannam@45: Panner::setScene(QGraphicsScene *s)
cannam@45: {
cannam@45:     if (scene()) {
Chris@133:         disconnect(scene(), SIGNAL(changed(const QList<QRectF> &)),
Chris@132:                    this, SLOT(slotSceneChanged(const QList<QRectF> &)));
cannam@45:         disconnect(scene(), SIGNAL(sceneRectChanged(const QRectF &)),
cannam@45:                    this, SLOT(slotSceneRectChanged(const QRectF &)));
cannam@45:     }
cannam@45:     QGraphicsView::setScene(s);
Chris@113:     if (scene()) {
Chris@113:         QRectF r = sceneRect();
Chris@113:         DEBUG << "scene rect: " << r << ", my rect " << rect() << endl;
Chris@113:         fit(r);
Chris@113:     }
cannam@45:     m_cache = QPixmap();
Chris@133:     connect(scene(), SIGNAL(changed(const QList<QRectF> &)),
Chris@132:             this, SLOT(slotSceneChanged(const QList<QRectF> &)));
cannam@45:     connect(scene(), SIGNAL(sceneRectChanged(const QRectF &)),
cannam@45:             this, SLOT(slotSceneRectChanged(const QRectF &)));
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::connectToPanned(Panned *p)
cannam@45: {
cannam@45:     connect(p, SIGNAL(pannedRectChanged(QRectF)),
cannam@45:             this, SLOT(slotSetPannedRect(QRectF)));
cannam@45: 
cannam@45:     connect(this, SIGNAL(pannedRectChanged(QRectF)),
cannam@45:             p, SLOT(slotSetPannedRect(QRectF)));
Chris@53: 
Chris@53:     connect(this, SIGNAL(zoomIn()),
Chris@53:             p, SLOT(zoomIn()));
Chris@53: 
Chris@53:     connect(this, SIGNAL(zoomOut()),
Chris@53:             p, SLOT(zoomOut()));
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::slotSetPannedRect(QRectF rect) 
cannam@45: {
cannam@45:     m_pannedRect = rect;
cannam@45:     viewport()->update();
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::resizeEvent(QResizeEvent *)
cannam@45: {
Chris@113:     if (scene()) fit(sceneRect());
cannam@45:     m_cache = QPixmap();
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::slotSceneRectChanged(const QRectF &newRect)
cannam@45: {
cannam@45:     if (!scene()) return; // spurious
Chris@113:     fit(newRect);
cannam@45:     m_cache = QPixmap();
cannam@45:     viewport()->update();
cannam@45: }
cannam@45: 
cannam@45: void
Chris@132: Panner::slotSceneChanged(const QList<QRectF> &)
Chris@132: {
Chris@132:     if (!scene()) return; // spurious
Chris@132:     m_cache = QPixmap();
Chris@132:     viewport()->update();
Chris@132: }
Chris@132: 
Chris@132: void
cannam@45: Panner::paintEvent(QPaintEvent *e)
cannam@45: {
cannam@45:     QPaintEvent *e2 = new QPaintEvent(e->region().boundingRect());
cannam@45:     QGraphicsView::paintEvent(e2);
cannam@45: 
cannam@45:     QPainter paint;
cannam@45:     paint.begin(viewport());
cannam@45:     paint.setClipRegion(e->region());
cannam@45: 
cannam@45:     QPainterPath path;
cannam@45:     path.addRect(rect());
cannam@45:     path.addPolygon(mapFromScene(m_pannedRect));
cannam@45: 
cannam@45:     QColor c(QColor::fromHsv(211, 194, 238));
cannam@45:     c.setAlpha(80);
cannam@45:     paint.setPen(Qt::NoPen);
cannam@45:     paint.setBrush(c);
cannam@45:     paint.drawPath(path);
cannam@45: 
cannam@45:     paint.setBrush(Qt::NoBrush);
cannam@45:     paint.setPen(QPen(QColor::fromHsv(211, 194, 238), 0));
cannam@45:     paint.drawConvexPolygon(mapFromScene(m_pannedRect));
cannam@45: 
cannam@45:     paint.end();
cannam@45: 
cannam@45:     emit pannerChanged(m_pannedRect);
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::updateScene(const QList<QRectF> &rects)
cannam@45: {
cannam@45:     if (!m_cache.isNull()) m_cache = QPixmap();
cannam@45:     QGraphicsView::updateScene(rects);
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::drawItems(QPainter *painter, int numItems,
cannam@45:                   QGraphicsItem *items[],
cannam@45:                   const QStyleOptionGraphicsItem options[])
cannam@45: {
cannam@45:     if (m_cache.size() != viewport()->size()) {
cannam@45: 
Chris@131:         DEBUG << "Panner: cache size " << m_cache.size() << " != viewport size " << viewport()->size() << ": recreating cache" << endl;
Chris@48: 
cannam@45:         QGraphicsScene *s = scene();
cannam@45:         if (!s) return;
cannam@45:         PannerScene *ps = static_cast<PannerScene *>(s);
cannam@45: 
cannam@45:         m_cache = QPixmap(viewport()->size());
cannam@45:         m_cache.fill(Qt::transparent);
cannam@45:         QPainter cachePainter;
cannam@45:         cachePainter.begin(&m_cache);
cannam@45:         cachePainter.setTransform(viewportTransform());
cannam@45:         ps->drawItems(&cachePainter, numItems, items, options);
cannam@45:         cachePainter.end();
cannam@45:     }
cannam@45: 
cannam@45:     painter->save();
cannam@45:     painter->setTransform(QTransform());
cannam@45:     painter->drawPixmap(0, 0, m_cache);
cannam@45:     painter->restore();
cannam@45: }
cannam@45:  
cannam@45: void
cannam@45: Panner::mousePressEvent(QMouseEvent *e)
cannam@45: {
cannam@45:     if (e->button() != Qt::LeftButton) {
cannam@45:         QGraphicsView::mouseDoubleClickEvent(e);
cannam@45:         return;
cannam@45:     }
cannam@45:     m_clicked = true;
cannam@45:     m_clickedRect = m_pannedRect;
cannam@45:     m_clickedPoint = e->pos();
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::mouseDoubleClickEvent(QMouseEvent *e)
cannam@45: {
cannam@45:     if (e->button() != Qt::LeftButton) {
cannam@45:         QGraphicsView::mouseDoubleClickEvent(e);
cannam@45:         return;
cannam@45:     }
cannam@45: 
cannam@45:     moveTo(e->pos());
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::mouseMoveEvent(QMouseEvent *e)
cannam@45: {
cannam@45:     if (!m_clicked) return;
cannam@45:     QPointF cp = mapToScene(m_clickedPoint);
cannam@45:     QPointF mp = mapToScene(e->pos());
cannam@45:     QPointF delta = mp - cp;
cannam@45:     QRectF nr = m_clickedRect;
cannam@45:     nr.translate(delta);
cannam@45:     slotSetPannedRect(nr);
cannam@45:     emit pannedRectChanged(m_pannedRect);
cannam@45:     viewport()->update();
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::mouseReleaseEvent(QMouseEvent *e)
cannam@45: {
cannam@45:     if (e->button() != Qt::LeftButton) {
cannam@45:         QGraphicsView::mouseDoubleClickEvent(e);
cannam@45:         return;
cannam@45:     }
cannam@45: 
cannam@45:     if (m_clicked) {
cannam@45:         mouseMoveEvent(e);
cannam@45:     }
cannam@45: 
cannam@45:     m_clicked = false;
cannam@45:     viewport()->update();
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::wheelEvent(QWheelEvent *e)
cannam@45: {
Chris@53:     int d = e->delta();
Chris@53:     if (d > 0) {
Chris@53:         while (d > 0) {
Chris@53:             emit zoomOut();
Chris@53:             d -= 120;
Chris@53:         }
cannam@45:     } else {
Chris@53:         while (d < 0) {
Chris@53:             emit zoomIn();
Chris@53:             d += 120;
Chris@53:         }
cannam@45:     }
cannam@45: }
cannam@45: 
cannam@45: void
cannam@45: Panner::moveTo(QPoint p)
cannam@45: {
cannam@45:     QPointF sp = mapToScene(p);
cannam@45:     QRectF nr = m_pannedRect;
cannam@45:     double d = sp.x() - nr.center().x();
cannam@45:     nr.translate(d, 0);
cannam@45:     slotSetPannedRect(nr);
cannam@45:     emit pannedRectChanged(m_pannedRect);
cannam@45:     viewport()->update();
cannam@45: }
cannam@45: