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/***************************************************************************
wdisplay.cpp - description
-------------------
begin : Fri Jun 21 2002
copyright : (C) 2002 by Tue & Ken Haste Andersen
email : haste@diku.dk
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "widget/wdisplay.h"
#include <QStylePainter>
#include <QStyleOption>
#include <QPaintEvent>
#include <QtDebug>
#include <QPixmap>
#include "widget/wpixmapstore.h"
WDisplay::WDisplay(QWidget * parent)
: WWidget(parent),
m_pPixmapBack(NULL),
m_bDisabledLoaded(false) {
setPositions(0);
}
WDisplay::~WDisplay() {
resetPositions();
}
void WDisplay::setup(QDomNode node, const SkinContext& context) {
// Set background pixmap if available
if (context.hasNode(node, "BackPath")) {
QString mode_str = context.selectAttributeString(
context.selectElement(node, "BackPath"), "mode", "TILE");
setPixmapBackground(context.getSkinPath(context.selectString(node, "BackPath")),
Paintable::DrawModeFromString(mode_str));
}
// Number of states
setPositions(context.selectInt(node, "NumberStates"));
// Load knob pixmaps
QString path = context.selectString(node, "Path");
for (int i = 0; i < m_pixmaps.size(); ++i) {
setPixmap(&m_pixmaps, i, context.getSkinPath(path.arg(i)));
}
// See if disabled images is defined, and load them...
if (context.hasNode(node, "DisabledPath")) {
QString disabledPath = context.selectString(node, "DisabledPath");
for (int i = 0; i < m_disabledPixmaps.size(); ++i) {
setPixmap(&m_disabledPixmaps, i,
context.getSkinPath(disabledPath.arg(i)));
}
m_bDisabledLoaded = true;
}
}
void WDisplay::setPositions(int iNoPos) {
resetPositions();
if (iNoPos < 0) {
qWarning() << "Negative NumberStates for Display.";
iNoPos = 0;
}
// QVector inserts NULLs for the new pixmaps.
m_pixmaps.resize(iNoPos);
m_disabledPixmaps.resize(iNoPos);
}
void WDisplay::resetPositions() {
m_pPixmapBack.clear();
m_pixmaps.resize(0);
m_disabledPixmaps.resize(0);
}
void WDisplay::setPixmapBackground(const QString& filename,
Paintable::DrawMode mode) {
m_pPixmapBack = WPixmapStore::getPaintable(filename, mode);
if (m_pPixmapBack.isNull() || m_pPixmapBack->isNull()) {
qDebug() << metaObject()->className()
<< "Error loading background pixmap:" << filename;
}
}
void WDisplay::setPixmap(QVector<PaintablePointer>* pPixmaps, int iPos,
const QString& filename) {
if (iPos < 0 || iPos >= pPixmaps->size()) {
return;
}
PaintablePointer pPixmap = WPixmapStore::getPaintable(filename,
Paintable::TILE);
if (pPixmap.isNull() || pPixmap->isNull()) {
qDebug() << metaObject()->className()
<< "Error loading pixmap:" << filename;
} else {
(*pPixmaps)[iPos] = pPixmap;
setFixedSize(pPixmap->size());
}
}
int WDisplay::getActivePixmapIndex() const {
// When there are an even number of pixmaps by convention we want a value of
// 0.5 to align to the lower of the two middle pixmaps. In Mixxx < 1.12.0 we
// accomplished this by the below formula:
// index = (m_value - 64.0/127.0) * (numPixmaps() - 1) + numPixmaps() / 2.0;
// But it's just as good to use m_value * numPixmaps() - epsilon. Using
// numPixmaps() instead of numPixmaps() - 1 ensures that every pixmap shares
// an equal slice of the value. Using m_value * (numPixmaps() - 1) gives an
// unequal slice of the value to the last pixmaps.
// Example:
// 3 pixmaps
// m_value * numPixmaps()
// idx: 0 1 2 3
// val: 0.0 ... 0.3 ... 0.6 ... 1.0
// Even distribution of value range, value 1 is out of bounds (3).
// m_value * (numPixmaps() - 1)
// idx: 0 1 2
// val: 0.0 ... 0.5 ... 1.0
// Pixmap 2 is only shown at value 1.
// floor(m_value * (numPixmaps() - 1) + 0.5)
// idx: 0 1 2
// val: 0.0 ... 0.25 ... 0.75 ... 1.0
// Pixmap 0 and Pixmap 2 only shown for 0.25 of value range
// 4 pixmaps
// m_value * numPixmaps()
// idx: 0 1 2 3 4
// val: 0.0 ... 0.25 ... 0.5 ... 0.75 ... 1.0
// Even distribution of value range, value 1 is out of bounds (4).
// Subtracting an epsilon prevents out of bound values at the end of the
// range and biases the middle value towards the lower of the 2 center
// pixmaps when there are an even number of pixmaps.
return static_cast<int>(getControlParameterDisplay() * numPixmaps() - 0.00001);
}
void WDisplay::paintEvent(QPaintEvent* ) {
QStyleOption option;
option.initFrom(this);
QStylePainter p(this);
p.drawPrimitive(QStyle::PE_Widget, option);
if (m_pPixmapBack) {
m_pPixmapBack->draw(0, 0, &p);
}
// If we are disabled, use the disabled pixmaps. If not, use the regular
// pixmaps.
const QVector<PaintablePointer>& pixmaps = (!isEnabled() && m_bDisabledLoaded) ?
m_disabledPixmaps : m_pixmaps;
if (pixmaps.empty()) {
return;
}
int idx = getActivePixmapIndex();
// Clamp active pixmap index to valid ranges.
if (idx < 0) {
idx = 0;
} else if (idx >= pixmaps.size()) {
idx = pixmaps.size() - 1;
}
PaintablePointer pPixmap = pixmaps[idx];
if (pPixmap) {
pPixmap->draw(0, 0, &p);
}
}
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