diff options
Diffstat (limited to 'tests/manual/examples/widgets/wiggly/wigglywidget.cpp')
-rw-r--r-- | tests/manual/examples/widgets/wiggly/wigglywidget.cpp | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/tests/manual/examples/widgets/wiggly/wigglywidget.cpp b/tests/manual/examples/widgets/wiggly/wigglywidget.cpp new file mode 100644 index 0000000000..3e686a67cf --- /dev/null +++ b/tests/manual/examples/widgets/wiggly/wigglywidget.cpp @@ -0,0 +1,65 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#include "wigglywidget.h" + +#include <QFontMetrics> +#include <QPainter> +#include <QTimerEvent> + +//! [0] +WigglyWidget::WigglyWidget(QWidget *parent) + : QWidget(parent), step(0) +{ + setBackgroundRole(QPalette::Midlight); + setAutoFillBackground(true); + + QFont newFont = font(); + newFont.setPointSize(newFont.pointSize() + 20); + setFont(newFont); + + timer.start(60, this); +} +//! [0] + +//! [1] +void WigglyWidget::paintEvent(QPaintEvent * /* event */) +//! [1] //! [2] +{ + 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(text)) / 2; + int y = (height() + metrics.ascent() - metrics.descent()) / 2; + QColor color; +//! [2] + +//! [3] + QPainter painter(this); +//! [3] //! [4] + int offset = 0; + for (char32_t codePoint : text.toUcs4()) { + int index = (step + offset++) % 16; + color.setHsv((15 - index) * 16, 255, 191); + painter.setPen(color); + QString symbol = QString::fromUcs4(&codePoint, 1); + painter.drawText(x, y - ((sineTable[index] * metrics.height()) / 400), symbol); + x += metrics.horizontalAdvance(symbol); + } +} +//! [4] + +//! [5] +void WigglyWidget::timerEvent(QTimerEvent *event) +//! [5] //! [6] +{ + if (event->timerId() == timer.timerId()) { + ++step; + update(); + } else { + QWidget::timerEvent(event); + } +//! [6] +} |