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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "progressindicator.h"
#include <QEvent>
#include <QPainter>
#include <QTimer>
#include <QWidget>
class OverlayWidget : public QWidget
{
public:
using PaintFunction = std::function<void(QWidget *, QPainter &, QPaintEvent *)>;
explicit OverlayWidget(QWidget *parent = nullptr)
{
setAttribute(Qt::WA_TransparentForMouseEvents);
if (parent)
attachToWidget(parent);
}
void attachToWidget(QWidget *parent)
{
if (parentWidget())
parentWidget()->removeEventFilter(this);
setParent(parent);
if (parent) {
parent->installEventFilter(this);
resizeToParent();
raise();
}
}
void setPaintFunction(const PaintFunction &paint) { m_paint = paint; }
protected:
bool eventFilter(QObject *obj, QEvent *ev) override
{
if (obj == parent() && ev->type() == QEvent::Resize)
resizeToParent();
return QWidget::eventFilter(obj, ev);
}
void paintEvent(QPaintEvent *ev) override
{
if (m_paint) {
QPainter p(this);
m_paint(this, p, ev);
}
}
private:
void resizeToParent() { setGeometry(QRect(QPoint(0, 0), parentWidget()->size())); }
PaintFunction m_paint;
};
class ProgressIndicatorPainter
{
public:
using UpdateCallback = std::function<void()>;
ProgressIndicatorPainter();
virtual ~ProgressIndicatorPainter() = default;
void setUpdateCallback(const UpdateCallback &cb) { m_callback = cb; }
QSize size() const { return m_pixmap.size() / m_pixmap.devicePixelRatio(); }
void paint(QPainter &painter, const QRect &rect) const;
void startAnimation() { m_timer.start(); }
void stopAnimation() { m_timer.stop(); }
protected:
void nextAnimationStep() { m_rotation = (m_rotation + m_rotationStep + 360) % 360; }
private:
const int m_rotationStep = 45;
int m_rotation = 0;
QTimer m_timer;
QPixmap m_pixmap;
UpdateCallback m_callback;
};
ProgressIndicatorPainter::ProgressIndicatorPainter()
{
m_timer.setSingleShot(false);
QObject::connect(&m_timer, &QTimer::timeout, &m_timer, [this] {
nextAnimationStep();
if (m_callback)
m_callback();
});
m_timer.setInterval(100);
m_pixmap = QPixmap(":/icons/progressindicator.png");
}
void ProgressIndicatorPainter::paint(QPainter &painter, const QRect &rect) const
{
painter.save();
painter.setRenderHint(QPainter::SmoothPixmapTransform);
QPoint translate(rect.x() + rect.width() / 2, rect.y() + rect.height() / 2);
QTransform t;
t.translate(translate.x(), translate.y());
t.rotate(m_rotation);
t.translate(-translate.x(), -translate.y());
painter.setTransform(t);
QSize pixmapUserSize(m_pixmap.size() / m_pixmap.devicePixelRatio());
painter.drawPixmap(QPoint(rect.x() + ((rect.width() - pixmapUserSize.width()) / 2),
rect.y() + ((rect.height() - pixmapUserSize.height()) / 2)),
m_pixmap);
painter.restore();
}
class ProgressIndicatorWidget : public OverlayWidget
{
public:
explicit ProgressIndicatorWidget(QWidget *parent = nullptr)
: OverlayWidget(parent)
{
setPaintFunction(
[this](QWidget *w, QPainter &p, QPaintEvent *) { m_paint.paint(p, w->rect()); });
m_paint.setUpdateCallback([this] { update(); });
updateGeometry();
}
QSize sizeHint() const final { return m_paint.size(); }
protected:
void showEvent(QShowEvent *) final { m_paint.startAnimation(); }
void hideEvent(QHideEvent *) final { m_paint.stopAnimation(); }
private:
ProgressIndicatorPainter m_paint;
};
ProgressIndicator::ProgressIndicator(QWidget *parent)
: QObject(parent)
, m_widget(new ProgressIndicatorWidget(parent)) {}
void ProgressIndicator::show()
{
m_widget->show();
}
void ProgressIndicator::hide()
{
m_widget->hide();
}
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