view widgets/Panner.cpp @ 1447:8afea53332f3 single-point

Add option to make pane sizes auto-resize-only (i.e. remove user control via a splitter); also place alignment views above panes instead of below, meaning the extra bit of space that we currently have for the pane without one at least goes to the primary pane

/* -*- 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();
}