Wiggly Widget : QWidget « Qt « C++

1. C++
2. Qt
3. QWidget

Wiggly Widget

  
/****************************************************************************
**
** 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** 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.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

#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();
}

   
    
  

Related examples in the same category