Mercurial > hg > svgui
view widgets/Panner.cpp @ 1363:bbeffb29bf09
Fix inconsistency between centre frame actually set and centre frame notified as set, which caused the start frame location to creep out of place gradually as you page through
author | Chris Cannam |
---|---|
date | Tue, 30 Oct 2018 14:00:20 +0000 |
parents | cb51d061cc25 |
children | d39db4673676 |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006 QMUL. 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 <QMouseEvent> #include <QPaintEvent> #include <QWheelEvent> #include <QPainter> #include "WidgetScale.h" #include <iostream> #include <cmath> Panner::Panner(QWidget *parent) : QWidget(parent), m_rectX(0), m_rectY(0), m_rectWidth(1), m_rectHeight(1), m_scrollUnit(0), m_defaultCentreX(0), m_defaultCentreY(0), m_defaultsSet(false), m_thumbColour(palette().highlightedText().color()), m_backgroundAlpha(255), m_thumbAlpha(255), m_clicked(false), m_dragStartX(0), m_dragStartY(0) { } Panner::~Panner() { } void Panner::setAlpha(int backgroundAlpha, int thumbAlpha) { m_backgroundAlpha = backgroundAlpha; m_thumbAlpha = thumbAlpha; } void Panner::setScrollUnit(float unit) { m_scrollUnit = unit; } void Panner::scroll(bool up) { scroll(up, 1); } void Panner::scroll(bool up, int count) { float unit = m_scrollUnit; if (unit == 0.f) { unit = float(m_rectHeight) / (6 * float(height())); if (unit < 0.01f) unit = 0.01f; } if (!up) { m_rectY += unit * float(count); } else { m_rectY -= unit * float(count); } normalise(); emitAndUpdate(); } void Panner::mousePressEvent(QMouseEvent *e) { if (e->button() == Qt::MidButton || ((e->button() == Qt::LeftButton) && (e->modifiers() & Qt::ControlModifier))) { resetToDefault(); } else if (e->button() == Qt::LeftButton) { m_clicked = true; m_clickPos = e->pos(); m_dragStartX = m_rectX; m_dragStartY = m_rectY; } } void Panner::mouseDoubleClickEvent(QMouseEvent *e) { if (e->button() != Qt::LeftButton) { return; } emit doubleClicked(); } void Panner::mouseMoveEvent(QMouseEvent *e) { if (!m_clicked) return; float dx = float(e->pos().x() - m_clickPos.x()) / float(width()); float dy = float(e->pos().y() - m_clickPos.y()) / float(height()); m_rectX = m_dragStartX + dx; m_rectY = m_dragStartY + dy; normalise(); repaint(); emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight); emit rectCentreMoved(centreX(), centreY()); } void Panner::mouseReleaseEvent(QMouseEvent *e) { if (!m_clicked) return; mouseMoveEvent(e); m_clicked = false; } void Panner::wheelEvent(QWheelEvent *e) { int delta = m_wheelCounter.count(e); scroll(delta > 0, abs(delta)); } void Panner::enterEvent(QEvent *) { emit mouseEntered(); } void Panner::leaveEvent(QEvent *) { emit mouseLeft(); } void Panner::paintEvent(QPaintEvent *) { QPainter paint(this); paint.setRenderHint(QPainter::Antialiasing, false); QColor bg(palette().background().color()); bg.setAlpha(m_backgroundAlpha); int penWidth = WidgetScale::scalePixelSize(1); if (penWidth < 1) penWidth = 1; paint.setPen(QPen(palette().dark().color(), penWidth)); paint.setBrush(bg); paint.drawRect(penWidth/2, penWidth/2, width()-penWidth/2-1, height()-penWidth/2-1); QColor hl(m_thumbColour); hl.setAlpha(m_thumbAlpha); paint.setBrush(hl); int rw = int(lrintf(float(width() - 1) * m_rectWidth)); int rh = int(lrintf(float(height() - 1) * m_rectHeight)); if (rw < 2) rw = 2; if (rh < 2) rh = 2; paint.drawRect(int(lrintf(float(width()) * m_rectX)), int(lrintf(float(height()) * m_rectY)), rw, rh); } void Panner::normalise() { if (m_rectWidth > 1.f) m_rectWidth = 1.f; if (m_rectHeight > 1.f) m_rectHeight = 1.f; if (m_rectX + m_rectWidth > 1.f) m_rectX = 1.f - m_rectWidth; if (m_rectX < 0) m_rectX = 0; if (m_rectY + m_rectHeight > 1.f) m_rectY = 1.f - m_rectHeight; if (m_rectY < 0) m_rectY = 0; if (!m_defaultsSet) { m_defaultCentreX = centreX(); m_defaultCentreY = centreY(); m_defaultsSet = true; } } void Panner::emitAndUpdate() { emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight); emit rectCentreMoved(centreX(), centreY()); update(); } void Panner::getRectExtents(float &x0, float &y0, float &width, float &height) { x0 = m_rectX; y0 = m_rectY; width = m_rectWidth; height = m_rectHeight; } void Panner::setRectExtents(float x0, float y0, float width, float height) { // SVDEBUG << "Panner::setRectExtents(" << x0 << ", " << y0 << ", " // << width << ", " << height << ")" << endl; if (m_rectX == x0 && m_rectY == y0 && m_rectWidth == width && m_rectHeight == height) { return; } m_rectX = x0; m_rectY = y0; m_rectWidth = width; m_rectHeight = height; normalise(); emitAndUpdate(); } void Panner::setRectWidth(float width) { if (m_rectWidth == width) return; m_rectWidth = width; normalise(); emitAndUpdate(); } void Panner::setRectHeight(float height) { if (m_rectHeight == height) return; m_rectHeight = height; normalise(); emitAndUpdate(); } void Panner::setRectCentreX(float x) { float x0 = x - m_rectWidth/2; if (x0 == m_rectX) return; m_rectX = x0; normalise(); emitAndUpdate(); } void Panner::setRectCentreY(float y) { float y0 = y - m_rectHeight/2; if (y0 == m_rectY) return; m_rectY = y0; normalise(); emitAndUpdate(); } QSize Panner::sizeHint() const { return QSize(30, 30); } void Panner::setDefaultRectCentre(float cx, float cy) { m_defaultCentreX = cx; m_defaultCentreY = cy; m_defaultsSet = true; } void Panner::resetToDefault() { float x0 = m_defaultCentreX - m_rectWidth/2; float y0 = m_defaultCentreY - m_rectHeight/2; if (x0 == m_rectX && y0 == m_rectY) return; m_rectX = x0; m_rectY = y0; normalise(); emitAndUpdate(); }