lbajardsilogic@0: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
lbajardsilogic@0: 
lbajardsilogic@0: /*
lbajardsilogic@0:     Sonic Visualiser
lbajardsilogic@0:     An audio file viewer and annotation editor.
lbajardsilogic@0:     Centre for Digital Music, Queen Mary, University of London.
lbajardsilogic@0:     This file copyright 2006 QMUL.
lbajardsilogic@0:     
lbajardsilogic@0:     This program is free software; you can redistribute it and/or
lbajardsilogic@0:     modify it under the terms of the GNU General Public License as
lbajardsilogic@0:     published by the Free Software Foundation; either version 2 of the
lbajardsilogic@0:     License, or (at your option) any later version.  See the file
lbajardsilogic@0:     COPYING included with this distribution for more information.
lbajardsilogic@0: */
lbajardsilogic@0: 
lbajardsilogic@0: #include "Panner.h"
lbajardsilogic@0: 
lbajardsilogic@0: #include <QMouseEvent>
lbajardsilogic@0: #include <QPaintEvent>
lbajardsilogic@0: #include <QWheelEvent>
lbajardsilogic@0: #include <QPainter>
lbajardsilogic@0: 
lbajardsilogic@0: #include <iostream>
lbajardsilogic@0: #include <cmath>
lbajardsilogic@0: 
lbajardsilogic@0: #include "system/System.h"
lbajardsilogic@0: 
lbajardsilogic@0: Panner::Panner(QWidget *parent) :
lbajardsilogic@0:     QWidget(parent),
lbajardsilogic@0:     m_rectX(0),
lbajardsilogic@0:     m_rectY(0),
lbajardsilogic@0:     m_rectWidth(1),
lbajardsilogic@0:     m_rectHeight(1),
lbajardsilogic@0:     m_defaultCentreX(0),
lbajardsilogic@0:     m_defaultCentreY(0),
lbajardsilogic@0:     m_defaultsSet(false),
lbajardsilogic@0:     m_thumbColour(palette().highlightedText().color()),
lbajardsilogic@0:     m_backgroundAlpha(255),
lbajardsilogic@0:     m_thumbAlpha(255),
lbajardsilogic@0:     m_clicked(false)
lbajardsilogic@0: {
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: Panner::~Panner()
lbajardsilogic@0: {
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::setAlpha(int backgroundAlpha, int thumbAlpha)
lbajardsilogic@0: {
lbajardsilogic@0:     m_backgroundAlpha = backgroundAlpha;
lbajardsilogic@0:     m_thumbAlpha = thumbAlpha;
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::mousePressEvent(QMouseEvent *e)
lbajardsilogic@0: {
lbajardsilogic@0:     if (e->button() == Qt::MidButton ||
lbajardsilogic@0:         ((e->button() == Qt::LeftButton) &&
lbajardsilogic@0:          (e->modifiers() & Qt::ControlModifier))) {
lbajardsilogic@0:         resetToDefault();
lbajardsilogic@0:     } else if (e->button() == Qt::LeftButton) {
lbajardsilogic@0:         m_clicked = true;
lbajardsilogic@0:         m_clickPos = e->pos();
lbajardsilogic@0:         m_dragStartX = m_rectX;
lbajardsilogic@0:         m_dragStartY = m_rectY;
lbajardsilogic@0:     }
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::mouseDoubleClickEvent(QMouseEvent *e)
lbajardsilogic@0: {
lbajardsilogic@0:     if (e->button() != Qt::LeftButton) {
lbajardsilogic@0:         return;
lbajardsilogic@0:     }
lbajardsilogic@0: 
lbajardsilogic@0:     emit doubleClicked();
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::mouseMoveEvent(QMouseEvent *e)
lbajardsilogic@0: {
lbajardsilogic@0:     if (!m_clicked) return;
lbajardsilogic@0: 
lbajardsilogic@0:     float dx = float(e->pos().x() - m_clickPos.x()) / float(width());
lbajardsilogic@0:     float dy = float(e->pos().y() - m_clickPos.y()) / float(height());
lbajardsilogic@0:     
lbajardsilogic@0:     m_rectX = m_dragStartX + dx;
lbajardsilogic@0:     m_rectY = m_dragStartY + dy;
lbajardsilogic@0:     
lbajardsilogic@0:     normalise();
lbajardsilogic@0:     repaint();
lbajardsilogic@0:     emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight);
lbajardsilogic@0:     emit rectCentreMoved(centreX(), centreY());
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::mouseReleaseEvent(QMouseEvent *e)
lbajardsilogic@0: {
lbajardsilogic@0:     if (!m_clicked) return;
lbajardsilogic@0: 
lbajardsilogic@0:     mouseMoveEvent(e);
lbajardsilogic@0:     m_clicked = false;
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::wheelEvent(QWheelEvent *e)
lbajardsilogic@0: {
lbajardsilogic@0:     if (e->delta() < 0) {
lbajardsilogic@0:         m_rectY += 0.1;
lbajardsilogic@0:     } else {
lbajardsilogic@0:         m_rectY -= 0.1;
lbajardsilogic@0:     }
lbajardsilogic@0: 
lbajardsilogic@0:     normalise();
lbajardsilogic@0:     emitAndUpdate();
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::enterEvent(QEvent *)
lbajardsilogic@0: {
lbajardsilogic@0:     emit mouseEntered();
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::leaveEvent(QEvent *)
lbajardsilogic@0: {
lbajardsilogic@0:     emit mouseLeft();
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::paintEvent(QPaintEvent *)
lbajardsilogic@0: {
lbajardsilogic@0:     QPainter paint(this);
lbajardsilogic@0:     paint.setRenderHint(QPainter::Antialiasing, false);
lbajardsilogic@0: 
lbajardsilogic@0:     QColor bg(palette().background().color());
lbajardsilogic@0:     bg.setAlpha(m_backgroundAlpha);
lbajardsilogic@0: 
lbajardsilogic@0:     paint.setPen(palette().dark().color());
lbajardsilogic@0:     paint.setBrush(bg);
lbajardsilogic@0:     paint.drawRect(0, 0, width(), height());
lbajardsilogic@0: 
lbajardsilogic@0:     QColor hl(m_thumbColour);
lbajardsilogic@0:     hl.setAlpha(m_thumbAlpha);
lbajardsilogic@0: 
lbajardsilogic@0:     paint.setBrush(hl);
lbajardsilogic@0: 
lbajardsilogic@0:     paint.drawRect(lrintf(width() * m_rectX),
lbajardsilogic@0:                    lrintf(height() * m_rectY),
lbajardsilogic@0:                    lrintf(width() * m_rectWidth),
lbajardsilogic@0:                    lrintf(height() * m_rectHeight));
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::normalise()
lbajardsilogic@0: {
lbajardsilogic@0:     if (m_rectWidth > 1.0) m_rectWidth = 1.0;
lbajardsilogic@0:     if (m_rectHeight > 1.0) m_rectHeight = 1.0;
lbajardsilogic@0:     if (m_rectX + m_rectWidth > 1.0) m_rectX = 1.0 - m_rectWidth;
lbajardsilogic@0:     if (m_rectX < 0) m_rectX = 0;
lbajardsilogic@0:     if (m_rectY + m_rectHeight > 1.0) m_rectY = 1.0 - m_rectHeight;
lbajardsilogic@0:     if (m_rectY < 0) m_rectY = 0;
lbajardsilogic@0: 
lbajardsilogic@0:     if (!m_defaultsSet) {
lbajardsilogic@0:         m_defaultCentreX = centreX();
lbajardsilogic@0:         m_defaultCentreY = centreY();
lbajardsilogic@0:         m_defaultsSet = true;
lbajardsilogic@0:     }
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::emitAndUpdate()
lbajardsilogic@0: {
lbajardsilogic@0:     emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight);
lbajardsilogic@0:     emit rectCentreMoved(centreX(), centreY());
lbajardsilogic@0:     update();
lbajardsilogic@0: }  
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::getRectExtents(float &x0, float &y0, float &width, float &height)
lbajardsilogic@0: {
lbajardsilogic@0:     x0 = m_rectX;
lbajardsilogic@0:     y0 = m_rectY;
lbajardsilogic@0:     width = m_rectWidth;
lbajardsilogic@0:     height = m_rectHeight;
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::setRectExtents(float x0, float y0, float width, float height)
lbajardsilogic@0: {
lbajardsilogic@0: //    std::cerr << "Panner::setRectExtents(" << x0 << ", " << y0 << ", "
lbajardsilogic@0: //              << width << ", " << height << ")" << std::endl;
lbajardsilogic@0: 
lbajardsilogic@0:     if (m_rectX == x0 &&
lbajardsilogic@0:         m_rectY == y0 &&
lbajardsilogic@0:         m_rectWidth == width &&
lbajardsilogic@0:         m_rectHeight == height) {
lbajardsilogic@0:         return;
lbajardsilogic@0:     }
lbajardsilogic@0: 
lbajardsilogic@0:     m_rectX = x0;
lbajardsilogic@0:     m_rectY = y0;
lbajardsilogic@0:     m_rectWidth = width;
lbajardsilogic@0:     m_rectHeight = height;
lbajardsilogic@0: 
lbajardsilogic@0:     normalise();
lbajardsilogic@0:     emitAndUpdate();
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::setRectWidth(float width)
lbajardsilogic@0: {
lbajardsilogic@0:     if (m_rectWidth == width) return;
lbajardsilogic@0:     m_rectWidth = width;
lbajardsilogic@0:     normalise();
lbajardsilogic@0:     emitAndUpdate();
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::setRectHeight(float height)
lbajardsilogic@0: {
lbajardsilogic@0:     if (m_rectHeight == height) return;
lbajardsilogic@0:     m_rectHeight = height;
lbajardsilogic@0:     normalise();
lbajardsilogic@0:     emitAndUpdate();
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::setRectCentreX(float x)
lbajardsilogic@0: {
lbajardsilogic@0:     float x0 = x - m_rectWidth/2;
lbajardsilogic@0:     if (x0 == m_rectX) return;
lbajardsilogic@0:     m_rectX = x0;
lbajardsilogic@0:     normalise();
lbajardsilogic@0:     emitAndUpdate();
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::setRectCentreY(float y)
lbajardsilogic@0: {
lbajardsilogic@0:     float y0 = y - m_rectHeight/2;
lbajardsilogic@0:     if (y0 == m_rectY) return;
lbajardsilogic@0:     m_rectY = y0;
lbajardsilogic@0:     normalise();
lbajardsilogic@0:     emitAndUpdate();
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: QSize
lbajardsilogic@0: Panner::sizeHint() const
lbajardsilogic@0: {
lbajardsilogic@0:     return QSize(30, 30);
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::setDefaultRectCentre(float cx, float cy)
lbajardsilogic@0: {
lbajardsilogic@0:     m_defaultCentreX = cx;
lbajardsilogic@0:     m_defaultCentreY = cy;
lbajardsilogic@0:     m_defaultsSet = true;
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: void
lbajardsilogic@0: Panner::resetToDefault()
lbajardsilogic@0: {
lbajardsilogic@0:     float x0 = m_defaultCentreX - m_rectWidth/2;
lbajardsilogic@0:     float y0 = m_defaultCentreY - m_rectHeight/2;
lbajardsilogic@0:     if (x0 == m_rectX && y0 == m_rectY) return;
lbajardsilogic@0:     m_rectX = x0;
lbajardsilogic@0:     m_rectY = y0;
lbajardsilogic@0:     normalise();
lbajardsilogic@0:     emitAndUpdate();
lbajardsilogic@0: }
lbajardsilogic@0: 
lbajardsilogic@0: