comparison widgets/Panner.cpp @ 172:d0b95a8cac96

* A start to a panner widget to go with thumbwheels

+/* -*- 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 Chris Cannam.
+    
+    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 <iostream>
+
+Panner::Panner(QWidget *parent) :
+    QWidget(parent),
+    m_rectX(0),
+    m_rectY(0),
+    m_rectWidth(1),
+    m_rectHeight(1)
+{
+}
+
+Panner::~Panner()
+{
+}
+
+void
+Panner::mousePressEvent(QMouseEvent *e)
+{
+}
+
+void
+Panner::mouseDoubleClickEvent(QMouseEvent *e)
+{
+}
+
+void
+Panner::mouseMoveEvent(QMouseEvent *e)
+{
+}
+
+void
+Panner::mouseReleaseEvent(QMouseEvent *e)
+{
+}
+
+void
+Panner::wheelEvent(QWheelEvent *e)
+{
+}
+
+void
+Panner::paintEvent(QPaintEvent *e)
+{
+    QPainter paint(this);
+    paint.fillRect(rect(), palette().background().color());
+    paint.setRenderHint(QPainter::Antialiasing, false);
+    paint.setPen(palette().dark().color());
+    paint.setBrush(palette().highlight().color());
+    paint.drawRect(QRectF(width() * m_rectX, height() - height() * m_rectY,
+                          width() * m_rectWidth, height() * m_rectHeight));
+}
+
+void
+Panner::normalise()
+{
+    if (m_rectWidth > 1.0) m_rectWidth = 1.0;
+    if (m_rectHeight > 1.0) m_rectHeight = 1.0;
+    if (m_rectX + m_rectWidth > 1.0) m_rectX = 1.0 - m_rectWidth;
+    if (m_rectX < 0) m_rectX = 0;
+    if (m_rectY + m_rectHeight > 1.0) m_rectY = 1.0 - m_rectHeight;
+    if (m_rectY < 0) m_rectY = 0;
+}
+
+void
+Panner::emitAndUpdate()
+{
+    emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight);
+    emit rectCentreMoved(m_rectX + (m_rectWidth/2), m_rectY + (m_rectHeight/2));
+    update();
+}  
+
+void
+Panner::setRectExtents(float x0, float y0, float width, float height)
+{
+    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_rectWidth/2;
+    if (y0 == m_rectY) return;
+    m_rectY = y0;
+    normalise();
+    emitAndUpdate();
+}
+
+QSize
+Panner::sizeHint() const
+{
+    return QSize(30, 30);
+}
+
+
+