27238f17b7
cache frame pixmaps since qpainter rtation is expensive svn path=/trunk/KDE/kdelibs/; revision=879936
153 lines
3.7 KiB
C++
153 lines
3.7 KiB
C++
/*
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* Copyright 2008 Marco Martin <notmart@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "busywidget.h"
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//Qt
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#include <QPainter>
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#include <QTimer>
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#include <QGraphicsSceneResizeEvent>
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//Plasma
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#include "plasma/theme.h"
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#include "plasma/svg.h"
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namespace Plasma
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{
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class BusyWidgetPrivate
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{
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public:
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BusyWidgetPrivate()
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: svg(0),
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timerId(0)
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{
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}
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~BusyWidgetPrivate()
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{
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}
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void themeChanged()
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{
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frames.clear();
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rotationAngle = svg->elementSize("hint-rotation-angle").width();
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//use an angle near to rotationAngle but that it fits an integer number of times in 360
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int nFrames = 360/rotationAngle;
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rotationAngle = 360/nFrames;
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}
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Svg *svg;
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QString styleSheet;
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int timerId;
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QHash<int, QPixmap> frames;
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qreal rotationAngle;
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qreal rotation;
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};
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BusyWidget::BusyWidget(QGraphicsWidget *parent)
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: QGraphicsWidget(parent),
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d(new BusyWidgetPrivate)
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{
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d->svg = new Plasma::Svg(this);
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d->svg->setImagePath("widgets/busywidget");
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d->svg->setContainsMultipleImages(true);
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d->themeChanged();
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connect(Plasma::Theme::defaultTheme(), SIGNAL(themeChanged()), SLOT(themeChanged()));
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}
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BusyWidget::~BusyWidget()
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{
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delete d;
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}
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void BusyWidget::timerEvent(QTimerEvent *event)
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{
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Q_UNUSED(event)
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d->rotation += d->rotationAngle;
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qreal overflow = d->rotation - 360;
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if ( overflow > 0) {
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d->rotation = overflow;
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}
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update();
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}
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void BusyWidget::paint(QPainter *painter,
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const QStyleOptionGraphicsItem *option,
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QWidget *widget)
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{
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Q_UNUSED(option)
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Q_UNUSED(widget)
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int intRotation = int(d->rotation);
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if (!d->frames[intRotation]) {
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QPointF translatedPos(size().width()/2.0, size().height()/2.0);
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d->frames[intRotation] = QPixmap(size().toSize());
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d->frames[intRotation].fill(Qt::transparent);
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QPainter buffPainter(&d->frames[intRotation]);
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buffPainter.setRenderHints(QPainter::SmoothPixmapTransform);
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buffPainter.translate(translatedPos);
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if (d->svg->hasElement("busywidget-shadow")) {
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buffPainter.save();
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buffPainter.translate(2,2);
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buffPainter.rotate(intRotation);
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d->svg->paint(&buffPainter, QRect(-translatedPos.toPoint(), size().toSize()), "busywidget-shadow");
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buffPainter.restore();
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}
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buffPainter.rotate(intRotation);
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d->svg->paint(&buffPainter, QRect(-translatedPos.toPoint(), size().toSize()), "busywidget");
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}
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painter->drawPixmap(QPoint(0,0), d->frames[intRotation]);
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}
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void BusyWidget::showEvent(QShowEvent *event)
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{
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Q_UNUSED(event)
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d->timerId = startTimer(150);
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}
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void BusyWidget::hideEvent(QHideEvent *event)
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{
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Q_UNUSED(event)
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killTimer(d->timerId);
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d->timerId = 0;
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}
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void BusyWidget::resizeEvent(QGraphicsSceneResizeEvent *event)
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{
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d->frames.clear();
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}
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} // namespace Plasma
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#include <busywidget.moc>
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