annotate panner.cpp @ 57:f583e44d9d31

* Update copyrights; add debug header
author Chris Cannam
date Tue, 16 Nov 2010 13:57:30 +0000
parents 0e5fba6750c2
children b0a90ac84b8b
rev   line source
Chris@57 1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
cannam@45 2
cannam@45 3 /*
Chris@57 4 EasyMercurial
Chris@57 5
Chris@57 6 Based on HgExplorer by Jari Korhonen
Chris@57 7 Copyright (c) 2010 Jari Korhonen
Chris@57 8 Copyright (c) 2010 Chris Cannam
Chris@57 9 Copyright (c) 2010 Queen Mary, University of London
Chris@57 10
cannam@45 11 This program is free software; you can redistribute it and/or
cannam@45 12 modify it under the terms of the GNU General Public License as
cannam@45 13 published by the Free Software Foundation; either version 2 of the
cannam@45 14 License, or (at your option) any later version. See the file
cannam@45 15 COPYING included with this distribution for more information.
cannam@45 16 */
cannam@45 17
cannam@45 18 #include "panner.h"
cannam@45 19 #include "panned.h"
cannam@45 20
cannam@45 21 #include <QPolygon>
cannam@45 22 #include <QMouseEvent>
cannam@45 23 #include <QColor>
Chris@46 24 #include <QGLWidget>
cannam@45 25
cannam@45 26 #include <iostream>
cannam@45 27
cannam@45 28 class PannerScene : public QGraphicsScene
cannam@45 29 {
cannam@45 30 public:
cannam@45 31 friend class Panner;
cannam@45 32 };
cannam@45 33
cannam@45 34 Panner::Panner() :
cannam@45 35 m_clicked(false)
cannam@45 36 {
Chris@46 37 // setViewport(new QGLWidget());
cannam@45 38 setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
cannam@45 39 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
Chris@48 40 setOptimizationFlags(QGraphicsView::DontSavePainterState |
Chris@48 41 QGraphicsView::IndirectPainting);
cannam@45 42 setMouseTracking(true);
cannam@45 43 setInteractive(false);
cannam@45 44 }
cannam@45 45
cannam@45 46 void
cannam@45 47 Panner::setScene(QGraphicsScene *s)
cannam@45 48 {
cannam@45 49 if (scene()) {
cannam@45 50 disconnect(scene(), SIGNAL(sceneRectChanged(const QRectF &)),
cannam@45 51 this, SLOT(slotSceneRectChanged(const QRectF &)));
cannam@45 52 }
cannam@45 53 QGraphicsView::setScene(s);
cannam@45 54 if (scene()) fitInView(sceneRect(), Qt::IgnoreAspectRatio);
cannam@45 55 m_cache = QPixmap();
cannam@45 56 connect(scene(), SIGNAL(sceneRectChanged(const QRectF &)),
cannam@45 57 this, SLOT(slotSceneRectChanged(const QRectF &)));
cannam@45 58 }
cannam@45 59
cannam@45 60 void
cannam@45 61 Panner::connectToPanned(Panned *p)
cannam@45 62 {
cannam@45 63 connect(p, SIGNAL(pannedRectChanged(QRectF)),
cannam@45 64 this, SLOT(slotSetPannedRect(QRectF)));
cannam@45 65
cannam@45 66 connect(this, SIGNAL(pannedRectChanged(QRectF)),
cannam@45 67 p, SLOT(slotSetPannedRect(QRectF)));
Chris@53 68
Chris@53 69 connect(this, SIGNAL(zoomIn()),
Chris@53 70 p, SLOT(zoomIn()));
Chris@53 71
Chris@53 72 connect(this, SIGNAL(zoomOut()),
Chris@53 73 p, SLOT(zoomOut()));
cannam@45 74 }
cannam@45 75
cannam@45 76 void
cannam@45 77 Panner::slotSetPannedRect(QRectF rect)
cannam@45 78 {
cannam@45 79 m_pannedRect = rect;
cannam@45 80 viewport()->update();
cannam@45 81 }
cannam@45 82
cannam@45 83 void
cannam@45 84 Panner::resizeEvent(QResizeEvent *)
cannam@45 85 {
cannam@45 86 if (scene()) fitInView(sceneRect(), Qt::IgnoreAspectRatio);
cannam@45 87 m_cache = QPixmap();
cannam@45 88 }
cannam@45 89
cannam@45 90 void
cannam@45 91 Panner::slotSceneRectChanged(const QRectF &newRect)
cannam@45 92 {
cannam@45 93 if (!scene()) return; // spurious
cannam@45 94 fitInView(newRect, Qt::IgnoreAspectRatio);
cannam@45 95 m_cache = QPixmap();
cannam@45 96 viewport()->update();
cannam@45 97 }
cannam@45 98
cannam@45 99 void
cannam@45 100 Panner::paintEvent(QPaintEvent *e)
cannam@45 101 {
cannam@45 102 QPaintEvent *e2 = new QPaintEvent(e->region().boundingRect());
cannam@45 103 QGraphicsView::paintEvent(e2);
cannam@45 104
cannam@45 105 QPainter paint;
cannam@45 106 paint.begin(viewport());
cannam@45 107 paint.setClipRegion(e->region());
cannam@45 108
cannam@45 109 QPainterPath path;
cannam@45 110 path.addRect(rect());
cannam@45 111 path.addPolygon(mapFromScene(m_pannedRect));
cannam@45 112
cannam@45 113 QColor c(QColor::fromHsv(211, 194, 238));
cannam@45 114 c.setAlpha(80);
cannam@45 115 paint.setPen(Qt::NoPen);
cannam@45 116 paint.setBrush(c);
cannam@45 117 paint.drawPath(path);
cannam@45 118
cannam@45 119 paint.setBrush(Qt::NoBrush);
cannam@45 120 paint.setPen(QPen(QColor::fromHsv(211, 194, 238), 0));
cannam@45 121 paint.drawConvexPolygon(mapFromScene(m_pannedRect));
cannam@45 122
cannam@45 123 paint.end();
cannam@45 124
cannam@45 125 emit pannerChanged(m_pannedRect);
cannam@45 126 }
cannam@45 127
cannam@45 128 void
cannam@45 129 Panner::updateScene(const QList<QRectF> &rects)
cannam@45 130 {
cannam@45 131 if (!m_cache.isNull()) m_cache = QPixmap();
cannam@45 132 QGraphicsView::updateScene(rects);
cannam@45 133 }
cannam@45 134
cannam@45 135 void
cannam@45 136 Panner::drawItems(QPainter *painter, int numItems,
cannam@45 137 QGraphicsItem *items[],
cannam@45 138 const QStyleOptionGraphicsItem options[])
cannam@45 139 {
cannam@45 140 if (m_cache.size() != viewport()->size()) {
cannam@45 141
Chris@48 142 std::cerr << "Panner: recreating cache" << std::endl;
Chris@48 143
cannam@45 144 QGraphicsScene *s = scene();
cannam@45 145 if (!s) return;
cannam@45 146 PannerScene *ps = static_cast<PannerScene *>(s);
cannam@45 147
cannam@45 148 m_cache = QPixmap(viewport()->size());
cannam@45 149 m_cache.fill(Qt::transparent);
cannam@45 150 QPainter cachePainter;
cannam@45 151 cachePainter.begin(&m_cache);
cannam@45 152 cachePainter.setTransform(viewportTransform());
cannam@45 153 ps->drawItems(&cachePainter, numItems, items, options);
cannam@45 154 cachePainter.end();
cannam@45 155 }
cannam@45 156
cannam@45 157 painter->save();
cannam@45 158 painter->setTransform(QTransform());
cannam@45 159 painter->drawPixmap(0, 0, m_cache);
cannam@45 160 painter->restore();
cannam@45 161 }
cannam@45 162
cannam@45 163 void
cannam@45 164 Panner::mousePressEvent(QMouseEvent *e)
cannam@45 165 {
cannam@45 166 if (e->button() != Qt::LeftButton) {
cannam@45 167 QGraphicsView::mouseDoubleClickEvent(e);
cannam@45 168 return;
cannam@45 169 }
cannam@45 170 m_clicked = true;
cannam@45 171 m_clickedRect = m_pannedRect;
cannam@45 172 m_clickedPoint = e->pos();
cannam@45 173 }
cannam@45 174
cannam@45 175 void
cannam@45 176 Panner::mouseDoubleClickEvent(QMouseEvent *e)
cannam@45 177 {
cannam@45 178 if (e->button() != Qt::LeftButton) {
cannam@45 179 QGraphicsView::mouseDoubleClickEvent(e);
cannam@45 180 return;
cannam@45 181 }
cannam@45 182
cannam@45 183 moveTo(e->pos());
cannam@45 184 }
cannam@45 185
cannam@45 186 void
cannam@45 187 Panner::mouseMoveEvent(QMouseEvent *e)
cannam@45 188 {
cannam@45 189 if (!m_clicked) return;
cannam@45 190 QPointF cp = mapToScene(m_clickedPoint);
cannam@45 191 QPointF mp = mapToScene(e->pos());
cannam@45 192 QPointF delta = mp - cp;
cannam@45 193 QRectF nr = m_clickedRect;
cannam@45 194 nr.translate(delta);
cannam@45 195 slotSetPannedRect(nr);
cannam@45 196 emit pannedRectChanged(m_pannedRect);
cannam@45 197 viewport()->update();
cannam@45 198 }
cannam@45 199
cannam@45 200 void
cannam@45 201 Panner::mouseReleaseEvent(QMouseEvent *e)
cannam@45 202 {
cannam@45 203 if (e->button() != Qt::LeftButton) {
cannam@45 204 QGraphicsView::mouseDoubleClickEvent(e);
cannam@45 205 return;
cannam@45 206 }
cannam@45 207
cannam@45 208 if (m_clicked) {
cannam@45 209 mouseMoveEvent(e);
cannam@45 210 }
cannam@45 211
cannam@45 212 m_clicked = false;
cannam@45 213 viewport()->update();
cannam@45 214 }
cannam@45 215
cannam@45 216 void
cannam@45 217 Panner::wheelEvent(QWheelEvent *e)
cannam@45 218 {
Chris@53 219 int d = e->delta();
Chris@53 220 if (d > 0) {
Chris@53 221 while (d > 0) {
Chris@53 222 emit zoomOut();
Chris@53 223 d -= 120;
Chris@53 224 }
cannam@45 225 } else {
Chris@53 226 while (d < 0) {
Chris@53 227 emit zoomIn();
Chris@53 228 d += 120;
Chris@53 229 }
cannam@45 230 }
cannam@45 231 }
cannam@45 232
cannam@45 233 void
cannam@45 234 Panner::moveTo(QPoint p)
cannam@45 235 {
cannam@45 236 QPointF sp = mapToScene(p);
cannam@45 237 QRectF nr = m_pannedRect;
cannam@45 238 double d = sp.x() - nr.center().x();
cannam@45 239 nr.translate(d, 0);
cannam@45 240 slotSetPannedRect(nr);
cannam@45 241 emit pannedRectChanged(m_pannedRect);
cannam@45 242 viewport()->update();
cannam@45 243 }
cannam@45 244