Chris@172: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@172: 
Chris@172: /*
Chris@172:     Sonic Visualiser
Chris@172:     An audio file viewer and annotation editor.
Chris@172:     Centre for Digital Music, Queen Mary, University of London.
Chris@182:     This file copyright 2006 QMUL.
Chris@172:     
Chris@172:     This program is free software; you can redistribute it and/or
Chris@172:     modify it under the terms of the GNU General Public License as
Chris@172:     published by the Free Software Foundation; either version 2 of the
Chris@172:     License, or (at your option) any later version.  See the file
Chris@172:     COPYING included with this distribution for more information.
Chris@172: */
Chris@172: 
Chris@172: #include "Panner.h"
Chris@172: 
Chris@172: #include <QMouseEvent>
Chris@172: #include <QPaintEvent>
Chris@172: #include <QWheelEvent>
Chris@172: #include <QPainter>
Chris@172: 
Chris@172: #include <iostream>
Chris@181: #include <cmath>
Martin@175: 
Chris@172: Panner::Panner(QWidget *parent) :
Chris@172:     QWidget(parent),
Chris@172:     m_rectX(0),
Chris@172:     m_rectY(0),
Chris@172:     m_rectWidth(1),
Chris@173:     m_rectHeight(1),
Chris@256:     m_scrollUnit(0),
Chris@173:     m_defaultCentreX(0),
Chris@173:     m_defaultCentreY(0),
Chris@173:     m_defaultsSet(false),
Chris@174:     m_thumbColour(palette().highlightedText().color()),
Chris@174:     m_backgroundAlpha(255),
Chris@174:     m_thumbAlpha(255),
Chris@173:     m_clicked(false)
Chris@172: {
Chris@172: }
Chris@172: 
Chris@172: Panner::~Panner()
Chris@172: {
Chris@172: }
Chris@172: 
Chris@172: void
Chris@174: Panner::setAlpha(int backgroundAlpha, int thumbAlpha)
Chris@174: {
Chris@174:     m_backgroundAlpha = backgroundAlpha;
Chris@174:     m_thumbAlpha = thumbAlpha;
Chris@174: }
Chris@174: 
Chris@174: void
Chris@256: Panner::setScrollUnit(float unit)
Chris@256: {
Chris@256:     m_scrollUnit = unit;
Chris@256: }
Chris@256: 
Chris@256: void
Chris@256: Panner::scroll(bool up)
Chris@256: {
Chris@256:     float unit = m_scrollUnit;
Chris@256:     if (unit == 0.f) {
Chris@256:         unit = float(m_rectHeight) / (6 * float(height()));
Chris@256:         if (unit < 0.01) unit = 0.01;
Chris@256:     }
Chris@256: 
Chris@256:     if (!up) {
Chris@256:         m_rectY += unit;
Chris@256:     } else {
Chris@256:         m_rectY -= unit;
Chris@256:     }
Chris@256: 
Chris@256:     normalise();
Chris@256:     emitAndUpdate();
Chris@256: }
Chris@256: 
Chris@256: void
Chris@172: Panner::mousePressEvent(QMouseEvent *e)
Chris@172: {
Chris@188:     if (e->button() == Qt::MidButton ||
Chris@188:         ((e->button() == Qt::LeftButton) &&
Chris@188:          (e->modifiers() & Qt::ControlModifier))) {
Chris@188:         resetToDefault();
Chris@188:     } else if (e->button() == Qt::LeftButton) {
Chris@173:         m_clicked = true;
Chris@173:         m_clickPos = e->pos();
Chris@173:         m_dragStartX = m_rectX;
Chris@173:         m_dragStartY = m_rectY;
Chris@173:     }
Chris@172: }
Chris@172: 
Chris@172: void
Chris@172: Panner::mouseDoubleClickEvent(QMouseEvent *e)
Chris@172: {
Chris@188:     if (e->button() != Qt::LeftButton) {
Chris@188:         return;
Chris@188:     }
Chris@188: 
Chris@188:     emit doubleClicked();
Chris@172: }
Chris@172: 
Chris@172: void
Chris@172: Panner::mouseMoveEvent(QMouseEvent *e)
Chris@172: {
Chris@173:     if (!m_clicked) return;
Chris@173: 
Chris@173:     float dx = float(e->pos().x() - m_clickPos.x()) / float(width());
Chris@173:     float dy = float(e->pos().y() - m_clickPos.y()) / float(height());
Chris@173:     
Chris@173:     m_rectX = m_dragStartX + dx;
Chris@173:     m_rectY = m_dragStartY + dy;
Chris@173:     
Chris@173:     normalise();
Chris@174:     repaint();
Chris@174:     emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight);
Chris@174:     emit rectCentreMoved(centreX(), centreY());
Chris@172: }
Chris@172: 
Chris@172: void
Chris@172: Panner::mouseReleaseEvent(QMouseEvent *e)
Chris@172: {
Chris@173:     if (!m_clicked) return;
Chris@173: 
Chris@173:     mouseMoveEvent(e);
Chris@173:     m_clicked = false;
Chris@172: }
Chris@172: 
Chris@172: void
Chris@172: Panner::wheelEvent(QWheelEvent *e)
Chris@172: {
Chris@256:     scroll(e->delta() > 0);
Chris@172: }
Chris@172: 
Chris@172: void
Chris@189: Panner::enterEvent(QEvent *)
Chris@189: {
Chris@189:     emit mouseEntered();
Chris@189: }
Chris@189: 
Chris@189: void
Chris@189: Panner::leaveEvent(QEvent *)
Chris@189: {
Chris@189:     emit mouseLeft();
Chris@189: }
Chris@189: 
Chris@189: void
Chris@249: Panner::paintEvent(QPaintEvent *)
Chris@172: {
Chris@172:     QPainter paint(this);
Chris@172:     paint.setRenderHint(QPainter::Antialiasing, false);
Chris@173: 
Chris@173:     QColor bg(palette().background().color());
Chris@174:     bg.setAlpha(m_backgroundAlpha);
Chris@173: 
Chris@172:     paint.setPen(palette().dark().color());
Chris@173:     paint.setBrush(bg);
Chris@438:     paint.drawRect(0, 0, width()-1, height()-1);
Chris@173: 
Chris@174:     QColor hl(m_thumbColour);
Chris@174:     hl.setAlpha(m_thumbAlpha);
Chris@173: 
Chris@173:     paint.setBrush(hl);
Chris@173: 
Chris@438:     int rw = lrintf((width() - 1) * m_rectWidth);
Chris@438:     int rh = lrintf((height() - 1) * m_rectHeight);
Chris@437:     if (rw < 2) rw = 2;
Chris@437:     if (rh < 2) rh = 2;
Chris@437: 
Chris@173:     paint.drawRect(lrintf(width() * m_rectX),
Chris@173:                    lrintf(height() * m_rectY),
Chris@437:                    rw, rh);
Chris@172: }
Chris@172: 
Chris@172: void
Chris@172: Panner::normalise()
Chris@172: {
Chris@172:     if (m_rectWidth > 1.0) m_rectWidth = 1.0;
Chris@172:     if (m_rectHeight > 1.0) m_rectHeight = 1.0;
Chris@172:     if (m_rectX + m_rectWidth > 1.0) m_rectX = 1.0 - m_rectWidth;
Chris@172:     if (m_rectX < 0) m_rectX = 0;
Chris@172:     if (m_rectY + m_rectHeight > 1.0) m_rectY = 1.0 - m_rectHeight;
Chris@172:     if (m_rectY < 0) m_rectY = 0;
Chris@173: 
Chris@173:     if (!m_defaultsSet) {
Chris@173:         m_defaultCentreX = centreX();
Chris@173:         m_defaultCentreY = centreY();
Chris@173:         m_defaultsSet = true;
Chris@173:     }
Chris@172: }
Chris@172: 
Chris@172: void
Chris@172: Panner::emitAndUpdate()
Chris@172: {
Chris@172:     emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight);
Chris@173:     emit rectCentreMoved(centreX(), centreY());
Chris@172:     update();
Chris@172: }  
Chris@172: 
Chris@172: void
Chris@188: Panner::getRectExtents(float &x0, float &y0, float &width, float &height)
Chris@188: {
Chris@188:     x0 = m_rectX;
Chris@188:     y0 = m_rectY;
Chris@188:     width = m_rectWidth;
Chris@188:     height = m_rectHeight;
Chris@188: }
Chris@188: 
Chris@188: void
Chris@172: Panner::setRectExtents(float x0, float y0, float width, float height)
Chris@172: {
Chris@249: //    std::cerr << "Panner::setRectExtents(" << x0 << ", " << y0 << ", "
Chris@249: //              << width << ", " << height << ")" << std::endl;
Chris@174: 
Chris@172:     if (m_rectX == x0 &&
Chris@172:         m_rectY == y0 &&
Chris@172:         m_rectWidth == width &&
Chris@172:         m_rectHeight == height) {
Chris@172:         return;
Chris@172:     }
Chris@173: 
Chris@172:     m_rectX = x0;
Chris@172:     m_rectY = y0;
Chris@172:     m_rectWidth = width;
Chris@172:     m_rectHeight = height;
Chris@173: 
Chris@172:     normalise();
Chris@172:     emitAndUpdate();
Chris@172: }
Chris@172: 
Chris@172: void
Chris@172: Panner::setRectWidth(float width)
Chris@172: {
Chris@172:     if (m_rectWidth == width) return;
Chris@172:     m_rectWidth = width;
Chris@172:     normalise();
Chris@172:     emitAndUpdate();
Chris@172: }
Chris@172: 
Chris@172: void
Chris@172: Panner::setRectHeight(float height)
Chris@172: {
Chris@172:     if (m_rectHeight == height) return;
Chris@172:     m_rectHeight = height;
Chris@172:     normalise();
Chris@172:     emitAndUpdate();
Chris@172: }
Chris@172: 
Chris@172: void
Chris@172: Panner::setRectCentreX(float x)
Chris@172: {
Chris@172:     float x0 = x - m_rectWidth/2;
Chris@172:     if (x0 == m_rectX) return;
Chris@172:     m_rectX = x0;
Chris@172:     normalise();
Chris@172:     emitAndUpdate();
Chris@172: }
Chris@172: 
Chris@172: void
Chris@172: Panner::setRectCentreY(float y)
Chris@172: {
Chris@173:     float y0 = y - m_rectHeight/2;
Chris@172:     if (y0 == m_rectY) return;
Chris@172:     m_rectY = y0;
Chris@172:     normalise();
Chris@172:     emitAndUpdate();
Chris@172: }
Chris@172: 
Chris@172: QSize
Chris@172: Panner::sizeHint() const
Chris@172: {
Chris@172:     return QSize(30, 30);
Chris@172: }
Chris@172: 
Chris@173: void
Chris@173: Panner::setDefaultRectCentre(float cx, float cy)
Chris@173: {
Chris@173:     m_defaultCentreX = cx;
Chris@173:     m_defaultCentreY = cy;
Chris@173:     m_defaultsSet = true;
Chris@173: }
Chris@172: 
Chris@173: void
Chris@173: Panner::resetToDefault()
Chris@173: {
Chris@173:     float x0 = m_defaultCentreX - m_rectWidth/2;
Chris@173:     float y0 = m_defaultCentreY - m_rectHeight/2;
Chris@173:     if (x0 == m_rectX && y0 == m_rectY) return;
Chris@173:     m_rectX = x0;
Chris@173:     m_rectY = y0;
Chris@173:     normalise();
Chris@173:     emitAndUpdate();
Chris@173: }
Chris@172: 
Chris@173: