Mercurial > hg > easyhg
view panner.cpp @ 51:bf3ab0ffb559
* some preliminaries for thinking about use of date in row layout
author | Chris Cannam |
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date | Thu, 11 Nov 2010 22:27:24 +0000 |
parents | 996b3c4037ef |
children | 3c46b2ac45d3 |
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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. Copyright 2000-2010 the Rosegarden development team. 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 "panner.h" #include "panned.h" #include <QPolygon> #include <QMouseEvent> #include <QColor> #include <QGLWidget> #include <iostream> class PannerScene : public QGraphicsScene { public: friend class Panner; }; Panner::Panner() : m_clicked(false) { // setViewport(new QGLWidget()); setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); setOptimizationFlags(QGraphicsView::DontSavePainterState | QGraphicsView::IndirectPainting); setMouseTracking(true); setInteractive(false); } void Panner::setScene(QGraphicsScene *s) { if (scene()) { disconnect(scene(), SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(slotSceneRectChanged(const QRectF &))); } QGraphicsView::setScene(s); if (scene()) fitInView(sceneRect(), Qt::IgnoreAspectRatio); m_cache = QPixmap(); connect(scene(), SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(slotSceneRectChanged(const QRectF &))); } void Panner::connectToPanned(Panned *p) { connect(p, SIGNAL(pannedRectChanged(QRectF)), this, SLOT(slotSetPannedRect(QRectF))); connect(this, SIGNAL(pannedRectChanged(QRectF)), p, SLOT(slotSetPannedRect(QRectF))); } void Panner::slotSetPannedRect(QRectF rect) { m_pannedRect = rect; viewport()->update(); } void Panner::resizeEvent(QResizeEvent *) { if (scene()) fitInView(sceneRect(), Qt::IgnoreAspectRatio); m_cache = QPixmap(); } void Panner::slotSceneRectChanged(const QRectF &newRect) { if (!scene()) return; // spurious fitInView(newRect, Qt::IgnoreAspectRatio); m_cache = QPixmap(); viewport()->update(); } void Panner::paintEvent(QPaintEvent *e) { QPaintEvent *e2 = new QPaintEvent(e->region().boundingRect()); QGraphicsView::paintEvent(e2); QPainter paint; paint.begin(viewport()); paint.setClipRegion(e->region()); QPainterPath path; path.addRect(rect()); path.addPolygon(mapFromScene(m_pannedRect)); QColor c(QColor::fromHsv(211, 194, 238)); c.setAlpha(80); paint.setPen(Qt::NoPen); paint.setBrush(c); paint.drawPath(path); paint.setBrush(Qt::NoBrush); paint.setPen(QPen(QColor::fromHsv(211, 194, 238), 0)); paint.drawConvexPolygon(mapFromScene(m_pannedRect)); paint.end(); emit pannerChanged(m_pannedRect); } void Panner::updateScene(const QList<QRectF> &rects) { if (!m_cache.isNull()) m_cache = QPixmap(); QGraphicsView::updateScene(rects); } void Panner::drawItems(QPainter *painter, int numItems, QGraphicsItem *items[], const QStyleOptionGraphicsItem options[]) { if (m_cache.size() != viewport()->size()) { std::cerr << "Panner: recreating cache" << std::endl; QGraphicsScene *s = scene(); if (!s) return; PannerScene *ps = static_cast<PannerScene *>(s); m_cache = QPixmap(viewport()->size()); m_cache.fill(Qt::transparent); QPainter cachePainter; cachePainter.begin(&m_cache); cachePainter.setTransform(viewportTransform()); ps->drawItems(&cachePainter, numItems, items, options); cachePainter.end(); } painter->save(); painter->setTransform(QTransform()); painter->drawPixmap(0, 0, m_cache); painter->restore(); } void Panner::mousePressEvent(QMouseEvent *e) { if (e->button() != Qt::LeftButton) { QGraphicsView::mouseDoubleClickEvent(e); return; } m_clicked = true; m_clickedRect = m_pannedRect; m_clickedPoint = e->pos(); } void Panner::mouseDoubleClickEvent(QMouseEvent *e) { if (e->button() != Qt::LeftButton) { QGraphicsView::mouseDoubleClickEvent(e); return; } moveTo(e->pos()); } void Panner::mouseMoveEvent(QMouseEvent *e) { if (!m_clicked) return; QPointF cp = mapToScene(m_clickedPoint); QPointF mp = mapToScene(e->pos()); QPointF delta = mp - cp; QRectF nr = m_clickedRect; nr.translate(delta); slotSetPannedRect(nr); emit pannedRectChanged(m_pannedRect); viewport()->update(); } void Panner::mouseReleaseEvent(QMouseEvent *e) { if (e->button() != Qt::LeftButton) { QGraphicsView::mouseDoubleClickEvent(e); return; } if (m_clicked) { mouseMoveEvent(e); } m_clicked = false; viewport()->update(); } void Panner::wheelEvent(QWheelEvent *e) { if (e->delta() > 0) { emit zoomOut(); } else { emit zoomIn(); } } void Panner::moveTo(QPoint p) { QPointF sp = mapToScene(p); QRectF nr = m_pannedRect; double d = sp.x() - nr.center().x(); nr.translate(d, 0); slotSetPannedRect(nr); emit pannedRectChanged(m_pannedRect); viewport()->update(); }