1/*
2 SPDX-FileCopyrightText: 2019 Harald Sitter <sitter@kde.org>
3
4 SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
5*/
6
7#include "kbusyindicatorwidget.h"
8
9#include <QApplication>
10#include <QIcon>
11#include <QPainter>
12#include <QResizeEvent>
13#include <QStyle>
14#include <QVariantAnimation>
15
16class KBusyIndicatorWidgetPrivate
17{
18public:
19 KBusyIndicatorWidgetPrivate(KBusyIndicatorWidget *parent)
20 : q(parent)
21 {
22 animation.setLoopCount(-1);
23 animation.setDuration(2000);
24 animation.setStartValue(0);
25 animation.setEndValue(360);
26 QObject::connect(sender: &animation, signal: &QVariantAnimation::valueChanged, context: q, slot: [this](QVariant value) {
27 rotation = value.toReal();
28 q->update(); // repaint new rotation
29 });
30 }
31
32 KBusyIndicatorWidget *const q;
33 QVariantAnimation animation;
34 QIcon icon = QIcon::fromTheme(QStringLiteral("view-refresh"));
35 qreal rotation = 0;
36 QPointF paintCenter;
37};
38
39KBusyIndicatorWidget::KBusyIndicatorWidget(QWidget *parent)
40 : QWidget(parent)
41 , d(new KBusyIndicatorWidgetPrivate(this))
42{
43}
44
45KBusyIndicatorWidget::~KBusyIndicatorWidget() = default;
46
47QSize KBusyIndicatorWidget::minimumSizeHint() const
48{
49 const auto extent = QApplication::style()->pixelMetric(metric: QStyle::PM_SmallIconSize);
50 return QSize(extent, extent);
51}
52
53bool KBusyIndicatorWidget::isRunning() const
54{
55 return d->animation.state() == QAbstractAnimation::Running;
56}
57
58void KBusyIndicatorWidget::start()
59{
60 d->animation.start();
61}
62
63void KBusyIndicatorWidget::stop()
64{
65 if (d->animation.state() == QAbstractAnimation::Running) // avoid warning if never started yet
66 d->animation.pause();
67}
68
69void KBusyIndicatorWidget::setRunning(const bool enable)
70{
71 if (enable)
72 start();
73 else
74 stop();
75}
76
77void KBusyIndicatorWidget::showEvent(QShowEvent *event)
78{
79 QWidget::showEvent(event);
80 start();
81}
82
83void KBusyIndicatorWidget::hideEvent(QHideEvent *event)
84{
85 QWidget::hideEvent(event);
86 stop();
87}
88
89void KBusyIndicatorWidget::resizeEvent(QResizeEvent *event)
90{
91 QWidget::resizeEvent(event);
92 d->paintCenter = QPointF(event->size().width() / 2.0, //
93 event->size().height() / 2.0);
94}
95
96void KBusyIndicatorWidget::paintEvent(QPaintEvent *)
97{
98 QPainter painter(this);
99 painter.setRenderHint(hint: QPainter::SmoothPixmapTransform);
100
101 // Rotate around the center and then reset back to origin for icon painting.
102 painter.translate(offset: d->paintCenter);
103 painter.rotate(a: d->rotation);
104 painter.translate(offset: -d->paintCenter);
105
106 d->icon.paint(painter: &painter, rect: rect());
107}
108
109bool KBusyIndicatorWidget::event(QEvent *event)
110{
111 // Only overridden to be flexible WRT binary compatible in the future.
112 // Overriding later has potential to change the call going through
113 // the vtable or not.
114 return QWidget::event(event);
115}
116
117#include "moc_kbusyindicatorwidget.cpp"
118

source code of kwidgetsaddons/src/kbusyindicatorwidget.cpp