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** Alternatively, this file may be used under the terms of the GNU
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#ifndef WIGGLYWIDGET_H
#define WIGGLYWIDGET_H
#include
#include
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
#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
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = 0);
};
#endif
#include
#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
#include "dialog.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Dialog dialog;
dialog.show();
return app.exec();
}