KWidgetsAddons

kbusyindicatorwidget.cpp
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(&animation, &QVariantAnimation::valueChanged, q, [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{
50 return QSize(extent, extent);
51}
52
53void KBusyIndicatorWidget::showEvent(QShowEvent *event)
54{
55 QWidget::showEvent(event);
56 d->animation.start();
57}
58
59void KBusyIndicatorWidget::hideEvent(QHideEvent *event)
60{
61 QWidget::hideEvent(event);
62 if (d->animation.state() == QAbstractAnimation::Running) // avoid warning if never started yet
63 d->animation.pause();
64}
65
66void KBusyIndicatorWidget::resizeEvent(QResizeEvent *event)
67{
69 d->paintCenter = QPointF(event->size().width() / 2.0, //
70 event->size().height() / 2.0);
71}
72
73void KBusyIndicatorWidget::paintEvent(QPaintEvent *)
74{
75 QPainter painter(this);
76 painter.setRenderHint(QPainter::SmoothPixmapTransform);
77
78 // Rotate around the center and then reset back to origin for icon painting.
79 painter.translate(d->paintCenter);
80 painter.rotate(d->rotation);
81 painter.translate(-d->paintCenter);
82
83 d->icon.paint(&painter, rect());
84}
85
86bool KBusyIndicatorWidget::event(QEvent *event)
87{
88 // Only overridden to be flexible WRT binary compatible in the future.
89 // Overriding later has potential to change the call going through
90 // the vtable or not.
91 return QWidget::event(event);
92}
93
94#include "moc_kbusyindicatorwidget.cpp"
Rotating spinning icon to indicate busyness.
AKONADI_CALENDAR_EXPORT KCalendarCore::Event::Ptr event(const Akonadi::Item &item)
void setLoopCount(int loopCount)
QStyle * style()
QIcon fromTheme(const QString &name)
QMetaObject::Connection connect(const QObject *sender, PointerToMemberFunction signal, Functor functor)
SmoothPixmapTransform
PM_SmallIconSize
virtual int pixelMetric(PixelMetric metric, const QStyleOption *option, const QWidget *widget) const const=0
qreal toReal(bool *ok) const const
void setDuration(int msecs)
void setEndValue(const QVariant &value)
void setStartValue(const QVariant &value)
void valueChanged(const QVariant &value)
virtual bool event(QEvent *event) override
virtual void hideEvent(QHideEvent *event)
virtual void resizeEvent(QResizeEvent *event)
virtual void showEvent(QShowEvent *event)
void update()
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