plasma-framework/widgets/meter.cpp

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/*
* Copyright (C) 2007 Petri Damsten <damu@iki.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "meter.h"
#include "plasma/svg.h"
#include <kdebug.h>
#include <QPainter>
namespace Plasma {
class Meter::Private
{
public:
Private(Meter* m) :
minimum(0),
maximum(100),
value(0),
meterType(AnalogMeter),
image(0),
minrotate(0),
maxrotate(360),
meter(m) {};
void paint(QPainter *p, const QString& elementID)
{
if (image->hasElement(elementID)) {
QRectF elementRect = image->elementRect(elementID);
image->paint(p, elementRect.topLeft(), elementID);
}
}
void text(QPainter *p, int index)
{
QString elementID = QString("label%1").arg(index);
QString text = labels[index];
if (image->hasElement(elementID)) {
QRectF elementRect = image->elementRect(elementID);
Qt::Alignment align = Qt::AlignCenter;
if (colors.count() > index) {
p->setPen(QPen(colors[index]));
}
if (fonts.count() > index) {
p->setFont(fonts[index]);
}
if (alignments.count() > index) {
align = alignments[index];
}
if (elementRect.width() > elementRect.height()) {
p->drawText(elementRect, align, text);
} else {
p->save();
QPointF rotateCenter(
elementRect.left() + elementRect.width() / 2,
elementRect.top() + elementRect.height() / 2);
p->translate(rotateCenter);
p->rotate(-90);
p->translate(elementRect.height() / -2,
elementRect.width() / -2);
QRectF r(0, 0, elementRect.height(), elementRect.width());
p->drawText(r, align, text);
p->restore();
}
}
}
void paintBackground(QPainter *p)
{
paint(p, "background");
p->save();
}
void paintForeground(QPainter *p)
{
p->restore();
for (int i = 0; i < labels.count(); ++i) {
text(p, i);
}
paint(p, "foreground");
}
void setSizePolicyAndPreferredSize()
{
switch (meterType) {
case BarMeterHorizontal:
meter->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
break;
case BarMeterVertical:
meter->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Expanding);
break;
case AnalogMeter:
default:
meter->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
break;
}
if (image) {
meter->setPreferredSize(image->size());
} else {
meter->setPreferredSize(QSizeF(30, 30));
}
}
int minimum;
int maximum;
int value;
QStringList labels;
QList<Qt::Alignment> alignments;
QList<QColor> colors;
QList<QFont> fonts;
QString svg;
MeterType meterType;
Plasma::Svg *image;
int minrotate;
int maxrotate;
Meter* meter;
};
Meter::Meter(QGraphicsItem *parent) :
QGraphicsWidget(parent),
d(new Private(this))
{
d->setSizePolicyAndPreferredSize();
}
Meter::~Meter()
{
delete d;
}
void Meter::setMaximum(int maximum)
{
d->maximum = maximum;
}
int Meter::maximum() const
{
return d->maximum;
}
void Meter::setMinimum(int minimum)
{
d->minimum = minimum;
}
int Meter::minimum() const
{
return d->minimum;
}
void Meter::setValue(int value)
{
d->value = value;
update();
}
int Meter::value() const
{
return d->value;
}
void Meter::setLabel(int index, const QString &text)
{
while (d->labels.count() <= index) {
d->labels << QString();
}
d->labels[index] = text;
}
QString Meter::label(int index) const
{
return d->labels[index];
}
void Meter::setLabelColor(int index, const QColor &color)
{
while (d->colors.count() <= index) {
d->colors << color;
}
d->colors[index] = color;
}
QColor Meter::labelColor(int index) const
{
return d->colors[index];
}
void Meter::setLabelFont(int index, const QFont &font)
{
while (d->fonts.count() <= index) {
d->fonts << font;
}
d->fonts[index] = font;
}
QFont Meter::labelFont(int index) const
{
return d->fonts[index];
}
void Meter::setLabelAlignment(int index, Qt::Alignment alignment)
{
while (d->alignments.count() <= index) {
d->alignments << alignment;
}
d->alignments[index] = alignment;
}
Qt::Alignment Meter::labelAlignment(int index) const
{
return d->alignments[index];
}
void Meter::dataUpdated(const QString &sourceName, const Plasma::DataEngine::Data &data)
{
Q_UNUSED(sourceName)
foreach (QVariant d, data) {
if (d.canConvert(QVariant::Int)) {
setValue(d.toInt());
return;
}
}
}
void Meter::setSvg(const QString &svg)
{
d->svg = svg;
delete d->image;
d->image = new Plasma::Svg(this);
d->image->setImagePath(svg);
// To create renderer and get default size
d->image->resize();
d->setSizePolicyAndPreferredSize();
if (d->image->hasElement("rotateminmax")) {
QRectF r = d->image->elementRect("rotateminmax");
d->minrotate = (int)r.height();
d->maxrotate = (int)r.width();
}
}
QString Meter::svg() const
{
return d->svg;
}
void Meter::setMeterType(MeterType meterType)
{
d->meterType = meterType;
if (d->svg.isEmpty()) {
if (meterType == BarMeterHorizontal) {
setSvg("widgets/bar_meter_horizontal");
} else if (meterType == BarMeterVertical) {
setSvg("widgets/bar_meter_vertical");
} else if (meterType == AnalogMeter) {
setSvg("widgets/analog_meter");
}
}
d->setSizePolicyAndPreferredSize();
}
Meter::MeterType Meter::meterType() const
{
return d->meterType;
}
void Meter::paint(QPainter *p,
const QStyleOptionGraphicsItem *option,
QWidget *widget)
{
Q_UNUSED(option)
Q_UNUSED(widget)
QRectF rect(QPointF(0, 0), size());
QRectF clipRect;
qreal percentage = 0.0;
qreal angle = 0.0;
QPointF rotateCenter;
QSize intSize = QSize((int)size().width(), (int)size().height());
if (intSize != d->image->size()) {
d->image->resize(intSize);
}
if (d->maximum != d->minimum) {
percentage = (qreal)d->value / (d->maximum - d->minimum);
}
p->setRenderHint(QPainter::SmoothPixmapTransform);
switch (d->meterType) {
case BarMeterHorizontal:
case BarMeterVertical:
d->paintBackground(p);
clipRect = d->image->elementRect("bar");
if (clipRect.width() > clipRect.height()) {
clipRect.setWidth(clipRect.width() * percentage);
} else {
qreal bottom = clipRect.bottom();
clipRect.setHeight(clipRect.height() * percentage);
clipRect.moveBottom(bottom);
}
p->setClipRect(clipRect);
d->paint(p, "bar");
d->paintForeground(p);
break;
case AnalogMeter:
d->paintBackground(p);
if (d->image->hasElement("rotatecenter")) {
QRectF r = d->image->elementRect("rotatecenter");
rotateCenter = QPointF(r.left() + r.width() / 2,
r.top() + r.height() / 2);
} else {
rotateCenter = QPointF(rect.width() / 2, rect.height() / 2);
}
angle = percentage * (d->maxrotate - d->minrotate) + d->minrotate;
p->translate(rotateCenter);
p->rotate(angle);
p->translate(-1 * rotateCenter);
d->paint(p, "pointer");
d->paintForeground(p);
break;
}
}
} // End of namepace
#include "meter.moc"