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/*
* Cantata
*
* Copyright (c) 2011-2022 Craig Drummond <craig.p.drummond@gmail.com>
*
* ----
*
* 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.
*
* 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 General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "spinner.h"
#include "utils.h"
#include <QAbstractItemView>
#include <QApplication>
#include <QPaintEvent>
#include <QPainter>
#include <QScrollBar>
#include <QTimer>
Spinner::Spinner(QObject* p, bool inMiddle)
: QWidget(nullptr), timer(nullptr), space(Utils::scaleForDpi(4)), value(0), active(false), central(inMiddle), onView(false)
{
Q_UNUSED(p)
int size = fontMetrics().height() * 1.5;
setVisible(false);
setMinimumSize(size, size);
setMaximumSize(size, size);
setAttribute(Qt::WA_TransparentForMouseEvents, true);
}
void Spinner::setWidget(QWidget* widget)
{
setParent(widget);
onView = qobject_cast<QAbstractItemView*>(widget);
}
void Spinner::start()
{
value = 0;
setVisible(true);
setPosition();
active = true;
if (!timer) {
timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(timeout()));
}
timer->start(75);
}
void Spinner::stop()
{
setVisible(false);
active = false;
if (timer) {
timer->stop();
}
}
static const int constSpinnerSteps = 64;
void Spinner::paintEvent(QPaintEvent* event)
{
static const int constParts = 8;
int lineWidth(Utils::scaleForDpi(2));
QPainter p(this);
QRectF rectangle(1.5, 1.5, size().width() - 3, size().height() - 3);
QColor col(palette().color(QPalette::Text));
p.setRenderHint(QPainter::Antialiasing, true);
p.setClipRect(event->rect());
double size = (360 * 16) / (2.0 * constParts);
for (int i = 0; i < constParts; ++i) {
col.setAlphaF((constParts - i) / (1.0 * constParts));
p.setPen(QPen(col, lineWidth));
p.drawArc(rectangle, (((constSpinnerSteps - value) * 1.0) / (constSpinnerSteps * 1.0) * 360 * 16) + (i * 2.0 * size), size);
}
p.end();
}
void Spinner::timeout()
{
setPosition();
update();
if (++value >= constSpinnerSteps) {
value = 0;
}
}
void Spinner::setPosition()
{
QWidget* pw = parentWidget();
int hSpace = space + (onView && pw && static_cast<QAbstractItemView*>(pw)->verticalScrollBar() && static_cast<QAbstractItemView*>(pw)->verticalScrollBar()->isVisible() ? static_cast<QAbstractItemView*>(pw)->verticalScrollBar()->width() + 2 : 0);
QPoint current = pos();
QPoint desired = central
? QPoint((parentWidget()->size().width() - size().width()) / 2, (parentWidget()->size().height() - size().height()) / 2)
: QApplication::isRightToLeft()
? QPoint(hSpace, space)
: QPoint(parentWidget()->size().width() - (size().width() + hSpace), space);
if (current != desired) {
move(desired);
}
}
#include "moc_spinner.cpp"
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