Mercurial > hg > easyhg
view panned.cpp @ 362:73fb5ef55744
Merge from branch "feature_91b". Really fixes #91
author | Chris Cannam |
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date | Thu, 17 Mar 2011 17:34:40 +0000 |
parents | 8fd71f570884 |
children |
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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) 2011 Chris Cannam Copyright (c) 2011 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 "panned.h" #include "debug.h" #include <QScrollBar> #include <QWheelEvent> #include <QTimer> #include <cmath> #include <iostream> Panned::Panned() : m_dragging(false) { m_dragTimer = new QTimer(this); m_dragTimerMs = 50; connect(m_dragTimer, SIGNAL(timeout()), this, SLOT(dragTimerTimeout())); setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing); } void Panned::resizeEvent(QResizeEvent *ev) { DEBUG << "Panned::resizeEvent()" << endl; QPointF nearpt = mapToScene(0, 0); QPointF farpt = mapToScene(width(), height()); QSizeF sz(farpt.x()-nearpt.x(), farpt.y()-nearpt.y()); QRectF pr(nearpt, sz); QGraphicsView::resizeEvent(ev); if (pr != m_pannedRect) { DEBUG << "Panned: setting panned rect to " << pr << endl; m_pannedRect = pr; centerOn(pr.center()); emit pannedRectChanged(pr); } } void Panned::setScene(QGraphicsScene *s) { if (!scene()) { QGraphicsView::setScene(s); return; } QPointF nearpt = mapToScene(0, 0); QPointF farpt = mapToScene(width(), height()); QSizeF sz(farpt.x()-nearpt.x(), farpt.y()-nearpt.y()); QRectF pr(nearpt, sz); QGraphicsView::setScene(s); DEBUG << "Panned::setScene: pr = " << pr << ", sceneRect = " << sceneRect() << endl; if (scene() && sceneRect().intersects(pr)) { DEBUG << "Panned::setScene: restoring old rect " << pr << endl; m_pannedRect = pr; centerOn(pr.center()); emit pannedRectChanged(pr); } } void Panned::paintEvent(QPaintEvent *e) { QGraphicsView::paintEvent(e); } void Panned::drawForeground(QPainter *paint, const QRectF &) { QPointF nearpt = mapToScene(0, 0); QPointF farpt = mapToScene(width(), height()); QSizeF sz(farpt.x()-nearpt.x(), farpt.y()-nearpt.y()); QRectF pr(nearpt, sz); if (pr != m_pannedRect) { DEBUG << "Panned::drawForeground: visible rect " << pr << " differs from panned rect " << m_pannedRect << ", updating panned rect" <<endl; if (pr.x() != m_pannedRect.x()) emit pannedContentsScrolled(); m_pannedRect = pr; emit pannedRectChanged(pr); } } void Panned::zoomIn() { QMatrix m = matrix(); m.scale(1.0 / 1.1, 1.0 / 1.1); setMatrix(m); } void Panned::zoomOut() { QMatrix m = matrix(); m.scale(1.1, 1.1); setMatrix(m); } void Panned::slotSetPannedRect(QRectF pr) { centerOn(pr.center()); // setSceneRect(pr); // m_pannedRect = pr; } void Panned::wheelEvent(QWheelEvent *ev) { if (ev->modifiers() & Qt::ControlModifier) { int d = ev->delta(); if (d > 0) { while (d > 0) { zoomOut(); d -= 120; } } else { while (d < 0) { zoomIn(); d += 120; } } } else { emit wheelEventReceived(ev); QGraphicsView::wheelEvent(ev); } } void Panned::slotEmulateWheelEvent(QWheelEvent *ev) { QGraphicsView::wheelEvent(ev); } void Panned::mousePressEvent(QMouseEvent *ev) { if (dragMode() != QGraphicsView::ScrollHandDrag || ev->button() != Qt::LeftButton) { QGraphicsView::mousePressEvent(ev); return; } DEBUG << "Panned::mousePressEvent: have left button in drag mode" << endl; setDragMode(QGraphicsView::NoDrag); QGraphicsView::mousePressEvent(ev); setDragMode(QGraphicsView::ScrollHandDrag); if (!ev->isAccepted()) { ev->accept(); m_dragging = true; m_lastDragPos = ev->pos(); m_lastOrigin = QPoint(horizontalScrollBar()->value(), verticalScrollBar()->value()); m_velocity = QPointF(0, 0); m_dragTimer->start(m_dragTimerMs); } } void Panned::mouseMoveEvent(QMouseEvent *ev) { if (!m_dragging) { QGraphicsView::mouseMoveEvent(ev); return; } DEBUG << "Panned::mouseMoveEvent: dragging" << endl; ev->accept(); QScrollBar *hBar = horizontalScrollBar(); QScrollBar *vBar = verticalScrollBar(); QPoint delta = ev->pos() - m_lastDragPos; hBar->setValue(hBar->value() + (isRightToLeft() ? delta.x() : -delta.x())); vBar->setValue(vBar->value() - delta.y()); m_lastDragPos = ev->pos(); } void Panned::mouseReleaseEvent(QMouseEvent *ev) { if (!m_dragging) { QGraphicsView::mouseReleaseEvent(ev); return; } DEBUG << "Panned::mouseReleaseEvent: dragging" << endl; ev->accept(); m_dragging = false; } void Panned::dragTimerTimeout() { QPoint origin = QPoint(horizontalScrollBar()->value(), verticalScrollBar()->value()); if (m_dragging) { m_velocity = QPointF (float(origin.x() - m_lastOrigin.x()) / m_dragTimerMs, float(origin.y() - m_lastOrigin.y()) / m_dragTimerMs); m_lastOrigin = origin; DEBUG << "Panned::dragTimerTimeout: velocity = " << m_velocity << endl; } else { if (origin == m_lastOrigin) { m_dragTimer->stop(); } float x = m_velocity.x(), y = m_velocity.y(); if (fabsf(x) > 1.0/m_dragTimerMs) x = x * 0.9f; else x = 0.f; if (fabsf(y) > 1.0/m_dragTimerMs) y = y * 0.9f; else y = 0.f; m_velocity = QPointF(x, y); DEBUG << "Panned::dragTimerTimeout: velocity adjusted to " << m_velocity << endl; m_lastOrigin = origin; //!!! need to store origin in floats horizontalScrollBar()->setValue(m_lastOrigin.x() + m_velocity.x() * m_dragTimerMs); verticalScrollBar()->setValue(m_lastOrigin.y() + m_velocity.y() * m_dragTimerMs); } } void Panned::leaveEvent(QEvent *) { emit mouseLeaves(); }