Add Qt3 development HEAD version

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diff --git a/examples/demo/qthumbwheel.cpp b/examples/demo/qthumbwheel.cpp
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+/****************************************************************************
+**
+** Definition of QThumbWheel class
+**
+** Created : 010205
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of the widgets module of the Qt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free Qt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.QPL
+** included in the packaging of this file.  Licensees holding valid Qt
+** Commercial licenses may use this file in accordance with the Qt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include "qthumbwheel.h"
+
+#ifndef QT_NO_THUMBWHEEL
+#include <qpainter.h>
+#include <qdrawutil.h>
+#include <qpixmap.h>
+#include <math.h>
+
+static const double m_pi = 3.14159265358979323846;
+static const double rad_factor = 180.0 / m_pi;
+
+QThumbWheel::QThumbWheel( QWidget *parent, const char *name )
+    : QFrame( parent, name )
+{
+    orient = Vertical;
+    init();
+}
+
+/*!
+  Destructs the wheel.
+*/
+
+QThumbWheel::~QThumbWheel()
+{
+}
+
+/*!
+  \internal
+ */
+
+void QThumbWheel::init()
+{
+    track = TRUE;
+    mousePressed = FALSE;
+    pressedAt = -1;
+    rat = 1.0;
+    setFrameStyle( WinPanel | Sunken );
+    setMargin( 2 );
+    setFocusPolicy( WheelFocus );
+}
+
+void QThumbWheel::setOrientation( Orientation orientation )
+{
+    orient = orientation;
+    update();
+}
+
+void QThumbWheel::setTracking( bool enable )
+{
+    track = enable;
+}
+
+void QThumbWheel::setTransmissionRatio( double r )
+{
+    rat = r;
+}
+
+/*!
+  Makes QRangeControl::setValue() available as a slot.
+*/
+
+void QThumbWheel::setValue( int value )
+{
+    QRangeControl::setValue( value );
+}
+
+void QThumbWheel::valueChange()
+{
+    repaint( FALSE );
+    emit valueChanged(value());
+}
+
+void QThumbWheel::rangeChange()
+{
+}
+
+void QThumbWheel::stepChange()
+{
+}
+
+/*!
+  \reimp
+*/
+
+void QThumbWheel::keyPressEvent( QKeyEvent *e )
+{
+    switch ( e->key() ) {
+    case Key_Left:
+	if ( orient == Horizontal )
+	    subtractLine();
+	break;
+    case Key_Right:
+	if ( orient == Horizontal )
+	    addLine();
+	break;
+    case Key_Up:
+	if ( orient == Vertical )
+	    subtractLine();
+	break;
+    case Key_Down:
+	if ( orient == Vertical )
+	    addLine();
+	break;
+    case Key_PageUp:
+	subtractPage();
+	break;
+    case Key_PageDown:
+	addPage();
+	break;
+    case Key_Home:
+	setValue( minValue() );
+	break;
+    case Key_End:
+	setValue( maxValue() );
+	break;
+    default:
+	e->ignore();
+	return;
+    };
+}
+
+/*!
+  \reimp
+*/
+
+void QThumbWheel::mousePressEvent( QMouseEvent *e )
+{
+    if ( e->button() == LeftButton ) {
+	mousePressed = TRUE;
+	pressedAt = valueFromPosition( e->pos() );
+    }
+}
+
+/*!
+  \reimp
+*/
+
+void QThumbWheel::mouseReleaseEvent( QMouseEvent *e )
+{
+    int movedTo = valueFromPosition( e->pos() );
+    setValue( value() + movedTo - pressedAt );
+    pressedAt = movedTo;
+}
+
+/*!
+  \reimp
+*/
+
+void QThumbWheel::mouseMoveEvent( QMouseEvent *e )
+{
+    if ( !mousePressed )
+	return;
+    if ( track ) {
+	int movedTo = valueFromPosition( e->pos() );
+	setValue( value() + movedTo - pressedAt );
+	pressedAt = movedTo;
+    }
+}
+
+/*!
+  \reimp
+*/
+
+void QThumbWheel::wheelEvent( QWheelEvent *e )
+{
+    int step = ( e->state() & ControlButton ) ? lineStep() : pageStep();
+    setValue( value() - e->delta()*step/120 );
+    e->accept();
+}
+
+/*!\reimp
+*/
+
+void QThumbWheel::focusInEvent( QFocusEvent *e )
+{
+    QWidget::focusInEvent( e );
+}
+
+/*!\reimp
+*/
+
+void QThumbWheel::focusOutEvent( QFocusEvent *e )
+{
+    QWidget::focusOutEvent( e );
+}
+
+void QThumbWheel::drawContents( QPainter *p )
+{
+    QRect cr = contentsRect();
+    // double buffer
+    QPixmap pix( width(), height() );
+    QPainter pt( &pix );
+    QBrush brush = backgroundPixmap() ?
+		QBrush( backgroundColor(), *backgroundPixmap() ) : QBrush( backgroundColor() );
+    pt.fillRect( cr, brush );
+
+    const int n = 17;
+    const double delta = m_pi / double(n);
+    // ### use positionFromValue() with rad*16 or similar
+    double alpha = 2*m_pi*double(value()-minValue())/
+		   double(maxValue()-minValue())*transmissionRatio();
+    alpha = fmod(alpha, delta);
+    QPen pen0( colorGroup().midlight() );
+    QPen pen1( colorGroup().dark() );
+
+    if ( orient == Horizontal ) {
+	double r = 0.5*cr.width();
+	int y0 = cr.y()+1;
+	int y1 = cr.bottom()-1;
+	for ( int i = 0; i < n; i++ ) {
+	    int x = cr.x() + int((1-cos(delta*double(i)+alpha))*r);
+	    pt.setPen( pen0 );
+	    pt.drawLine( x, y0, x, y1 );
+	    pt.setPen( pen1 );
+	    pt.drawLine( x+1, y0, x+1, y1 );
+	}
+    } else {
+	// vertical orientation
+	double r = 0.5*cr.height();
+	int x0 = cr.x()+1;
+	int x1 = cr.right()-1;
+	for ( int i = 0; i < n; i++ ) {
+	    int y = cr.y() + int((1-cos(delta*double(i)+alpha))*r);
+	    pt.setPen( pen0 );
+	    pt.drawLine( x0, y, x1, y );
+	    pt.setPen( pen1 );
+	    pt.drawLine( x0, y+1, x1, y+1 );
+	}
+    }
+    qDrawShadePanel( &pt, cr, colorGroup());
+
+    pt.end();
+    p->drawPixmap( 0, 0, pix );
+}
+
+int QThumbWheel::valueFromPosition( const QPoint &p )
+{
+    QRect wrec = contentsRect();
+    int pos, min, max;
+    if ( orient == Horizontal ) {
+	pos = p.x();
+	min = wrec.left();
+	max = wrec.right();
+    } else {
+	pos = p.y();
+	min = wrec.top();
+	max = wrec.bottom();
+    }
+    double alpha;
+    if ( pos < min )
+	alpha = 0;
+    else if ( pos > max )
+	alpha = m_pi;
+    else
+	alpha = acos( 1.0 - 2.0*double(pos-min)/double(max-min) );// ### taylor
+    double deg = alpha*rad_factor/transmissionRatio();
+    // ### use valueFromPosition()
+    return minValue() + int((maxValue()-minValue())*deg/360.0);
+}
+
+#endif