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waitview.cpp
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waitview.cpp
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/********************************************************************************
** Created by: Alex Levkovich (alevkovich@tut.by)
** License: GPL
********************************************************************************/
#include "waitview.h"
#include <QPaintEvent>
#include <QPainterPath>
#include <QPainter>
#include <QApplication>
#include <QPixmapCache>
const double WaitView::m_innerRadius = 0.8;
const double WaitView::m_outerRadius = 1.0;
const double WaitView::m_size = 100.0;
WaitView::WaitView(QWidget *parent) : QWidget(parent) {
angle = 360;
m_backgroundColor = QApplication::palette().color(QPalette::Highlight);
m_foregroundColor = QApplication::palette().color(QPalette::Base);
m_actualInnerRadius = m_size*0.5*m_innerRadius;
m_actualOuterRadius = m_size*0.5*m_outerRadius;
setMinimumSize(m_size,m_size);
QPalette pal(palette());
pal.setColor(QPalette::Background,QApplication::palette().color(QPalette::Base));
setAutoFillBackground(true);
setPalette(pal);
connect(&m_timer,SIGNAL(timeout()),this,SLOT(changeAngle()));
}
void WaitView::changeAngle() {
angle -= 10;
if (angle == 0) angle = 360;
update((width()-m_size)*0.5,(height()-m_size)*0.5,m_size,m_size);
}
QPixmap WaitView::generatePixmap() const {
QString m_cacheKey = QString("%1").arg(angle);
QPixmap pixmap;
if (!QPixmapCache::find(m_cacheKey, &pixmap)) {
// Set up a convenient path
QPainterPath path;
path.setFillRule(Qt::OddEvenFill);
path.addEllipse(QPointF(m_actualOuterRadius,m_actualOuterRadius),m_actualOuterRadius,m_actualOuterRadius);
path.addEllipse(QPointF(m_actualOuterRadius,m_actualOuterRadius),m_actualInnerRadius,m_actualInnerRadius);
double nActualDiameter = 2 * m_actualOuterRadius;
pixmap = QPixmap(nActualDiameter,nActualDiameter);
pixmap.fill(Qt::transparent);
QPainter p(&pixmap);
// Draw the ring background
p.setPen(Qt::NoPen);
p.setBrush(m_backgroundColor);
p.setRenderHint(QPainter::Antialiasing);
p.drawPath(path);
// Draw the ring foreground
QConicalGradient gradient(QPointF(m_actualOuterRadius,m_actualOuterRadius),angle);
gradient.setColorAt(0.0,Qt::transparent);
gradient.setColorAt(0.05,m_foregroundColor);
gradient.setColorAt(0.8,Qt::transparent);
p.setBrush(gradient);
p.drawPath(path);
p.end();
QPixmapCache::insert(m_cacheKey,pixmap);
}
return pixmap;
}
void WaitView::paintEvent(QPaintEvent *event) {
QRect pixmapRect((width()-m_size)*0.5,(height()-m_size)*0.5,m_size,m_size);
if (!event->rect().intersects(pixmapRect)) return;
QPainter painter(this);
painter.drawPixmap(pixmapRect.x(),pixmapRect.y(),generatePixmap());
painter.end();
}
void WaitView::showEvent(QShowEvent * event) {
QWidget::showEvent(event);
m_timer.start(50);
}
void WaitView::hideEvent(QHideEvent * event) {
QWidget::hideEvent(event);
m_timer.stop();
}