Wiggly Widget : QWidget « Qt « C++






Wiggly Widget

  
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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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