annotate panner.cpp @ 250:be483734bde5

* Make it possible for changeset items to take two or three lines of description, depending on how much there is * Some other small improvements to how changeset items are drawn (e.g. give them opaque white backgrounds)
author Chris Cannam
date Tue, 11 Jan 2011 17:58:14 +0000
parents 8fd71f570884
children
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@244 8 Copyright (c) 2011 Chris Cannam
Chris@244 9 Copyright (c) 2011 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"
Chris@113 20 #include "debug.h"
cannam@45 21
cannam@45 22 #include <QPolygon>
cannam@45 23 #include <QMouseEvent>
cannam@45 24 #include <QColor>
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 {
cannam@45 37 setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
cannam@45 38 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
Chris@48 39 setOptimizationFlags(QGraphicsView::DontSavePainterState |
Chris@48 40 QGraphicsView::IndirectPainting);
cannam@45 41 setMouseTracking(true);
cannam@45 42 setInteractive(false);
cannam@45 43 }
cannam@45 44
cannam@45 45 void
Chris@113 46 Panner::fit(QRectF r)
Chris@113 47 {
Chris@113 48 Qt::AspectRatioMode m = Qt::IgnoreAspectRatio;
Chris@113 49 if (height() > width()) {
Chris@113 50 // Our panner is vertical; if the source is not tall,
Chris@113 51 // don't stretch it to fit in the height, it'd look weird
Chris@113 52 if (r.height() < height() * 2) {
Chris@113 53 m = Qt::KeepAspectRatio;
Chris@113 54 }
Chris@113 55 } else {
Chris@113 56 // Similarly, but horizontal
Chris@113 57 if (r.width() < width() * 2) {
Chris@113 58 m = Qt::KeepAspectRatio;
Chris@113 59 }
Chris@113 60 }
Chris@113 61 DEBUG << "Panner: fit mode " << m << endl;
Chris@113 62 fitInView(r, m);
Chris@113 63 }
Chris@113 64
Chris@113 65 void
cannam@45 66 Panner::setScene(QGraphicsScene *s)
cannam@45 67 {
cannam@45 68 if (scene()) {
Chris@133 69 disconnect(scene(), SIGNAL(changed(const QList<QRectF> &)),
Chris@132 70 this, SLOT(slotSceneChanged(const QList<QRectF> &)));
cannam@45 71 disconnect(scene(), SIGNAL(sceneRectChanged(const QRectF &)),
cannam@45 72 this, SLOT(slotSceneRectChanged(const QRectF &)));
cannam@45 73 }
cannam@45 74 QGraphicsView::setScene(s);
Chris@136 75 m_cache = QPixmap();
Chris@113 76 if (scene()) {
Chris@113 77 QRectF r = sceneRect();
Chris@113 78 DEBUG << "scene rect: " << r << ", my rect " << rect() << endl;
Chris@113 79 fit(r);
Chris@136 80 connect(scene(), SIGNAL(changed(const QList<QRectF> &)),
Chris@136 81 this, SLOT(slotSceneChanged(const QList<QRectF> &)));
Chris@136 82 connect(scene(), SIGNAL(sceneRectChanged(const QRectF &)),
Chris@136 83 this, SLOT(slotSceneRectChanged(const QRectF &)));
Chris@113 84 }
cannam@45 85 }
cannam@45 86
cannam@45 87 void
cannam@45 88 Panner::connectToPanned(Panned *p)
cannam@45 89 {
cannam@45 90 connect(p, SIGNAL(pannedRectChanged(QRectF)),
cannam@45 91 this, SLOT(slotSetPannedRect(QRectF)));
cannam@45 92
cannam@45 93 connect(this, SIGNAL(pannedRectChanged(QRectF)),
cannam@45 94 p, SLOT(slotSetPannedRect(QRectF)));
Chris@53 95
Chris@53 96 connect(this, SIGNAL(zoomIn()),
Chris@53 97 p, SLOT(zoomIn()));
Chris@53 98
Chris@53 99 connect(this, SIGNAL(zoomOut()),
Chris@53 100 p, SLOT(zoomOut()));
cannam@45 101 }
cannam@45 102
cannam@45 103 void
cannam@45 104 Panner::slotSetPannedRect(QRectF rect)
cannam@45 105 {
cannam@45 106 m_pannedRect = rect;
cannam@45 107 viewport()->update();
cannam@45 108 }
cannam@45 109
cannam@45 110 void
cannam@45 111 Panner::resizeEvent(QResizeEvent *)
cannam@45 112 {
Chris@250 113 DEBUG << "Panner::resizeEvent" << endl;
Chris@113 114 if (scene()) fit(sceneRect());
cannam@45 115 m_cache = QPixmap();
cannam@45 116 }
cannam@45 117
cannam@45 118 void
cannam@45 119 Panner::slotSceneRectChanged(const QRectF &newRect)
cannam@45 120 {
Chris@250 121 DEBUG << "Panner::slotSceneRectChanged" << endl;
cannam@45 122 if (!scene()) return; // spurious
Chris@113 123 fit(newRect);
cannam@45 124 m_cache = QPixmap();
cannam@45 125 viewport()->update();
cannam@45 126 }
cannam@45 127
cannam@45 128 void
Chris@132 129 Panner::slotSceneChanged(const QList<QRectF> &)
Chris@132 130 {
Chris@250 131 DEBUG << "Panner::slotSceneChanged" << endl;
Chris@132 132 if (!scene()) return; // spurious
Chris@132 133 m_cache = QPixmap();
Chris@132 134 viewport()->update();
Chris@132 135 }
Chris@132 136
Chris@132 137 void
cannam@45 138 Panner::paintEvent(QPaintEvent *e)
cannam@45 139 {
cannam@45 140 QPaintEvent *e2 = new QPaintEvent(e->region().boundingRect());
cannam@45 141 QGraphicsView::paintEvent(e2);
cannam@45 142
cannam@45 143 QPainter paint;
cannam@45 144 paint.begin(viewport());
cannam@45 145 paint.setClipRegion(e->region());
cannam@45 146
cannam@45 147 QPainterPath path;
cannam@45 148 path.addRect(rect());
cannam@45 149 path.addPolygon(mapFromScene(m_pannedRect));
cannam@45 150
cannam@45 151 QColor c(QColor::fromHsv(211, 194, 238));
cannam@45 152 c.setAlpha(80);
cannam@45 153 paint.setPen(Qt::NoPen);
cannam@45 154 paint.setBrush(c);
cannam@45 155 paint.drawPath(path);
cannam@45 156
cannam@45 157 paint.setBrush(Qt::NoBrush);
cannam@45 158 paint.setPen(QPen(QColor::fromHsv(211, 194, 238), 0));
cannam@45 159 paint.drawConvexPolygon(mapFromScene(m_pannedRect));
cannam@45 160
cannam@45 161 paint.end();
cannam@45 162
cannam@45 163 emit pannerChanged(m_pannedRect);
cannam@45 164 }
cannam@45 165
cannam@45 166 void
cannam@45 167 Panner::updateScene(const QList<QRectF> &rects)
cannam@45 168 {
Chris@250 169 DEBUG << "Panner::updateScene" << endl;
Chris@250 170 // if (!m_cache.isNull()) m_cache = QPixmap();
cannam@45 171 QGraphicsView::updateScene(rects);
cannam@45 172 }
cannam@45 173
cannam@45 174 void
cannam@45 175 Panner::drawItems(QPainter *painter, int numItems,
cannam@45 176 QGraphicsItem *items[],
cannam@45 177 const QStyleOptionGraphicsItem options[])
cannam@45 178 {
cannam@45 179 if (m_cache.size() != viewport()->size()) {
cannam@45 180
Chris@131 181 DEBUG << "Panner: cache size " << m_cache.size() << " != viewport size " << viewport()->size() << ": recreating cache" << endl;
Chris@48 182
cannam@45 183 QGraphicsScene *s = scene();
cannam@45 184 if (!s) return;
cannam@45 185 PannerScene *ps = static_cast<PannerScene *>(s);
cannam@45 186
cannam@45 187 m_cache = QPixmap(viewport()->size());
cannam@45 188 m_cache.fill(Qt::transparent);
cannam@45 189 QPainter cachePainter;
cannam@45 190 cachePainter.begin(&m_cache);
cannam@45 191 cachePainter.setTransform(viewportTransform());
cannam@45 192 ps->drawItems(&cachePainter, numItems, items, options);
cannam@45 193 cachePainter.end();
Chris@250 194
Chris@250 195 DEBUG << "done" << endl;
cannam@45 196 }
cannam@45 197
cannam@45 198 painter->save();
cannam@45 199 painter->setTransform(QTransform());
cannam@45 200 painter->drawPixmap(0, 0, m_cache);
cannam@45 201 painter->restore();
cannam@45 202 }
cannam@45 203
cannam@45 204 void
cannam@45 205 Panner::mousePressEvent(QMouseEvent *e)
cannam@45 206 {
cannam@45 207 if (e->button() != Qt::LeftButton) {
cannam@45 208 QGraphicsView::mouseDoubleClickEvent(e);
cannam@45 209 return;
cannam@45 210 }
cannam@45 211 m_clicked = true;
cannam@45 212 m_clickedRect = m_pannedRect;
cannam@45 213 m_clickedPoint = e->pos();
cannam@45 214 }
cannam@45 215
cannam@45 216 void
cannam@45 217 Panner::mouseDoubleClickEvent(QMouseEvent *e)
cannam@45 218 {
cannam@45 219 if (e->button() != Qt::LeftButton) {
cannam@45 220 QGraphicsView::mouseDoubleClickEvent(e);
cannam@45 221 return;
cannam@45 222 }
cannam@45 223
cannam@45 224 moveTo(e->pos());
cannam@45 225 }
cannam@45 226
cannam@45 227 void
cannam@45 228 Panner::mouseMoveEvent(QMouseEvent *e)
cannam@45 229 {
cannam@45 230 if (!m_clicked) return;
cannam@45 231 QPointF cp = mapToScene(m_clickedPoint);
cannam@45 232 QPointF mp = mapToScene(e->pos());
cannam@45 233 QPointF delta = mp - cp;
cannam@45 234 QRectF nr = m_clickedRect;
cannam@45 235 nr.translate(delta);
Chris@173 236 m_pannedRect = nr;
cannam@45 237 emit pannedRectChanged(m_pannedRect);
cannam@45 238 viewport()->update();
cannam@45 239 }
cannam@45 240
cannam@45 241 void
cannam@45 242 Panner::mouseReleaseEvent(QMouseEvent *e)
cannam@45 243 {
cannam@45 244 if (e->button() != Qt::LeftButton) {
cannam@45 245 QGraphicsView::mouseDoubleClickEvent(e);
cannam@45 246 return;
cannam@45 247 }
cannam@45 248
cannam@45 249 if (m_clicked) {
cannam@45 250 mouseMoveEvent(e);
cannam@45 251 }
cannam@45 252
cannam@45 253 m_clicked = false;
cannam@45 254 viewport()->update();
cannam@45 255 }
cannam@45 256
cannam@45 257 void
cannam@45 258 Panner::wheelEvent(QWheelEvent *e)
cannam@45 259 {
Chris@53 260 int d = e->delta();
Chris@53 261 if (d > 0) {
Chris@53 262 while (d > 0) {
Chris@53 263 emit zoomOut();
Chris@53 264 d -= 120;
Chris@53 265 }
cannam@45 266 } else {
Chris@53 267 while (d < 0) {
Chris@53 268 emit zoomIn();
Chris@53 269 d += 120;
Chris@53 270 }
cannam@45 271 }
cannam@45 272 }
cannam@45 273
cannam@45 274 void
cannam@45 275 Panner::moveTo(QPoint p)
cannam@45 276 {
cannam@45 277 QPointF sp = mapToScene(p);
cannam@45 278 QRectF nr = m_pannedRect;
cannam@45 279 double d = sp.x() - nr.center().x();
cannam@45 280 nr.translate(d, 0);
cannam@45 281 slotSetPannedRect(nr);
cannam@45 282 emit pannedRectChanged(m_pannedRect);
cannam@45 283 viewport()->update();
cannam@45 284 }
cannam@45 285