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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "wigglywidget.h"
#include <QtGui/QFontMetrics>
#include <QtGui/QPainter>
#include <QtCore/QTimerEvent>
//! [0]
WigglyWidget::WigglyWidget(QWidget *parent)
: QWidget(parent)
{
setBackgroundRole(QPalette::Midlight);
setAutoFillBackground(true);
QFont newFont = font();
newFont.setPointSize(newFont.pointSize() + 20);
setFont(newFont);
}
//! [0]
//! [1]
void WigglyWidget::paintEvent(QPaintEvent * /* event */)
//! [1] //! [2]
{
if (m_text.isEmpty())
return;
static constexpr int sineTable[16] = {
0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38
};
QFontMetrics metrics(font());
int x = (width() - metrics.horizontalAdvance(m_text)) / 2;
int y = (height() + metrics.ascent() - metrics.descent()) / 2;
QColor color;
//! [2]
//! [3]
QPainter painter(this);
//! [3] //! [4]
int offset = 0;
const auto codePoints = m_text.toUcs4();
for (char32_t codePoint : codePoints) {
const int index = (m_step + offset++) % 16;
color.setHsv((15 - index) * 16, 255, 191);
painter.setPen(color);
QString symbol = QString::fromUcs4(&codePoint, 1);
const int dy = (sineTable[index] * metrics.height()) / 400;
painter.drawText(x, y - dy, symbol);
x += metrics.horizontalAdvance(symbol);
}
}
//! [4]
//! [5]
void WigglyWidget::timerEvent(QTimerEvent *event)
//! [5] //! [6]
{
if (event->timerId() == m_timer.timerId()) {
++m_step;
update();
} else {
QWidget::timerEvent(event);
}
//! [6]
}
QString WigglyWidget::text() const
{
return m_text;
}
void WigglyWidget::setText(const QString &newText)
{
m_text = newText;
}
bool WigglyWidget::isRunning() const
{
return m_timer.isActive();
}
void WigglyWidget::setRunning(bool r)
{
if (r == isRunning())
return;
if (r)
m_timer.start(60, this);
else
m_timer.stop();
}
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