Mercurial > hg > easyhg
view panner.cpp @ 169:c7fa56707ae9
* Status text updates
author | Chris Cannam |
---|---|
date | Tue, 14 Dec 2010 20:36:30 +0000 |
parents | d66fcf2e0342 |
children | a6d336837ebe |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* EasyMercurial Based on HgExplorer by Jari Korhonen Copyright (c) 2010 Jari Korhonen Copyright (c) 2010 Chris Cannam Copyright (c) 2010 Queen Mary, University of London 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 "debug.h" #include <QPolygon> #include <QMouseEvent> #include <QColor> #include <iostream> class PannerScene : public QGraphicsScene { public: friend class Panner; }; Panner::Panner() : m_clicked(false) { setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); setOptimizationFlags(QGraphicsView::DontSavePainterState | QGraphicsView::IndirectPainting); setMouseTracking(true); setInteractive(false); } void Panner::fit(QRectF r) { Qt::AspectRatioMode m = Qt::IgnoreAspectRatio; if (height() > width()) { // Our panner is vertical; if the source is not tall, // don't stretch it to fit in the height, it'd look weird if (r.height() < height() * 2) { m = Qt::KeepAspectRatio; } } else { // Similarly, but horizontal if (r.width() < width() * 2) { m = Qt::KeepAspectRatio; } } DEBUG << "Panner: fit mode " << m << endl; fitInView(r, m); } void Panner::setScene(QGraphicsScene *s) { if (scene()) { disconnect(scene(), SIGNAL(changed(const QList<QRectF> &)), this, SLOT(slotSceneChanged(const QList<QRectF> &))); disconnect(scene(), SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(slotSceneRectChanged(const QRectF &))); } QGraphicsView::setScene(s); m_cache = QPixmap(); if (scene()) { QRectF r = sceneRect(); DEBUG << "scene rect: " << r << ", my rect " << rect() << endl; fit(r); connect(scene(), SIGNAL(changed(const QList<QRectF> &)), this, SLOT(slotSceneChanged(const QList<QRectF> &))); 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))); connect(this, SIGNAL(zoomIn()), p, SLOT(zoomIn())); connect(this, SIGNAL(zoomOut()), p, SLOT(zoomOut())); } void Panner::slotSetPannedRect(QRectF rect) { m_pannedRect = rect; viewport()->update(); } void Panner::resizeEvent(QResizeEvent *) { if (scene()) fit(sceneRect()); m_cache = QPixmap(); } void Panner::slotSceneRectChanged(const QRectF &newRect) { if (!scene()) return; // spurious fit(newRect); m_cache = QPixmap(); viewport()->update(); } void Panner::slotSceneChanged(const QList<QRectF> &) { if (!scene()) return; // spurious 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()) { DEBUG << "Panner: cache size " << m_cache.size() << " != viewport size " << viewport()->size() << ": recreating cache" << 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) { int d = e->delta(); if (d > 0) { while (d > 0) { emit zoomOut(); d -= 120; } } else { while (d < 0) { emit zoomIn(); d += 120; } } } 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(); }