Mega Code Archive
Wiggly Widget
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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
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****************************************************************************/
#ifndef WIGGLYWIDGET_H
#define WIGGLYWIDGET_H
#include <QBasicTimer>
#include <QWidget>
class WigglyWidget : public QWidget
{
Q_OBJECT
public:
WigglyWidget(QWidget *parent = 0);
public slots:
void setText(const QString &newText) { text = newText; }
protected:
void paintEvent(QPaintEvent *event);
void timerEvent(QTimerEvent *event);
private:
QBasicTimer timer;
QString text;
int step;
};
#endif
#include <QtGui>
#include "wigglywidget.h"
WigglyWidget::WigglyWidget(QWidget *parent)
: QWidget(parent)
{
setBackgroundRole(QPalette::Midlight);
setAutoFillBackground(true);
QFont newFont = font();
newFont.setPointSize(newFont.pointSize() + 20);
setFont(newFont);
step = 0;
timer.start(60, this);
}
void WigglyWidget::paintEvent(QPaintEvent * /* event */)
{
static const 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.width(text)) / 2;
int y = (height() + metrics.ascent() - metrics.descent()) / 2;
QColor color;
QPainter painter(this);
for (int i = 0; i < text.size(); ++i) {
int index = (step + i) % 16;
color.setHsv((15 - index) * 16, 255, 191);
painter.setPen(color);
painter.drawText(x, y - ((sineTable[index] * metrics.height()) / 400),
QString(text[i]));
x += metrics.width(text[i]);
}
}
void WigglyWidget::timerEvent(QTimerEvent *event)
{
if (event->timerId() == timer.timerId()) {
++step;
update();
} else {
QWidget::timerEvent(event);
}
}
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = 0);
};
#endif
#include <QtGui>
#include "dialog.h"
#include "wigglywidget.h"
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
{
WigglyWidget *wigglyWidget = new WigglyWidget;
QLineEdit *lineEdit = new QLineEdit;
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(wigglyWidget);
layout->addWidget(lineEdit);
setLayout(layout);
connect(lineEdit, SIGNAL(textChanged(QString)),
wigglyWidget, SLOT(setText(QString)));
lineEdit->setText(tr("Hello world!"));
setWindowTitle(tr("Wiggly"));
resize(360, 145);
}
#include <QApplication>
#include "dialog.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Dialog dialog;
dialog.show();
return app.exec();
}
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