/**************************************************************************** ** ** Implementation of the dial widget ** ** Created : 979899 ** ** 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 "qdial.h" #ifndef QT_NO_DIAL #include "qpainter.h" #include "qpointarray.h" #include "qcolor.h" #include "qapplication.h" #include "qregion.h" #include "qbitmap.h" #include "qstyle.h" #if defined(QT_ACCESSIBILITY_SUPPORT) #include "qaccessible.h" #endif #include // sin(), cos(), atan() //### Forutsetter linking med math lib - Jfr kommentar i qpainter_x11.cpp! static const double m_pi = 3.14159265358979323846; static const double rad_factor = 180.0 / m_pi; class QDialPrivate { public: QDialPrivate() { wrapping = FALSE; tracking = TRUE; doNotEmit = FALSE; target = 3.7; mousePressed = FALSE; } bool wrapping; bool tracking; bool doNotEmit; double target; QRect eraseArea; bool eraseAreaValid; bool showNotches; bool onlyOutside; bool mousePressed; QPointArray lines; }; /*! \class QDial qdial.h \brief The QDial class provides a rounded range control (like a speedometer or potentiometer). \ingroup basic \mainclass QDial is used when the user needs to control a value within a program-definable range, and the range either wraps around (typically, 0..359 degrees) or the dialog layout needs a square widget. Both API- and UI-wise, the dial is very similar to a \link QSlider slider. \endlink Indeed, when wrapping() is FALSE (the default) there is no real difference between a slider and a dial. They have the same signals, slots and member functions, all of which do the same things. Which one you use depends only on your taste and on the application. The dial initially emits valueChanged() signals continuously while the slider is being moved; you can make it emit the signal less often by calling setTracking(FALSE). dialMoved() is emitted continuously even when tracking() is FALSE. The slider also emits dialPressed() and dialReleased() signals when the mouse button is pressed and released. But note that the dial's value can change without these signals being emitted; the keyboard and wheel can be used to change the value. Unlike the slider, QDial attempts to draw a "nice" number of notches rather than one per lineStep(). If possible, the number of notches drawn is one per lineStep(), but if there aren't enough pixels to draw every one, QDial will draw every second, third etc., notch. notchSize() returns the number of units per notch, hopefully a multiple of lineStep(); setNotchTarget() sets the target distance between neighbouring notches in pixels. The default is 3.75 pixels. Like the slider, the dial makes the QRangeControl functions setValue(), addLine(), subtractLine(), addPage() and subtractPage() available as slots. The dial's keyboard interface is fairly simple: The left/up and right/down arrow keys move by lineStep(), page up and page down by pageStep() and Home and End to minValue() and maxValue(). \sa QScrollBar QSpinBox \link guibooks.html#fowler GUI Design Handbook: Slider\endlink */ /*! Constructs a dial called \a name with parent \a parent. \a f is propagated to the QWidget constructor. It has the default range of a QRangeControl. */ QDial::QDial( QWidget *parent, const char *name, WFlags f ) : QWidget( parent, name, f | WNoAutoErase ), QRangeControl() { d = new QDialPrivate; d->eraseAreaValid = FALSE; d->showNotches = FALSE; d->onlyOutside = FALSE; setFocusPolicy( QWidget::WheelFocus ); } /*! Constructs a dial called \a name with parent \a parent. The dial's value can never be smaller than \a minValue or greater than \a maxValue. Its page step size is \a pageStep, and its initial value is \a value. \a value is forced to be within the legal range. */ QDial::QDial( int minValue, int maxValue, int pageStep, int value, QWidget *parent, const char *name ) : QWidget( parent, name, WNoAutoErase ), QRangeControl( minValue, maxValue, 1, pageStep, value ) { d = new QDialPrivate; d->eraseAreaValid = FALSE; d->showNotches = FALSE; d->onlyOutside = FALSE; setFocusPolicy( QWidget::WheelFocus ); } /*! Destroys the dial. */ QDial::~QDial() { delete d; } void QDial::setTracking( bool enable ) { d->tracking = enable; } /*! \property QDial::tracking \brief whether tracking is enabled If TRUE (the default), tracking is enabled. This means that the arrow can be moved using the mouse; otherwise the arrow cannot be moved with the mouse. */ bool QDial::tracking() const { return d ? d->tracking : TRUE; } void QDial::setValue( int newValue ) { // ### set doNotEmit? Matthias? QRangeControl::setValue( newValue ); } /*! Increments the dial's value() by one lineStep(). */ void QDial::addLine() { QRangeControl::addLine(); } /*! Decrements the dial's value() by one lineStep(). */ void QDial::subtractLine() { QRangeControl::subtractLine(); } /*! \reimp */ void QDial::resizeEvent( QResizeEvent * e ) { d->lines.resize( 0 ); QWidget::resizeEvent( e ); } /*! \reimp */ void QDial::paintEvent( QPaintEvent * e ) { repaintScreen( &e->rect() ); } /*! Paints the dial using clip region \a cr. */ void QDial::repaintScreen( const QRect *cr ) { QPainter p; p.begin( this ); bool resetClipping = FALSE; // calculate clip-region for erasing background if ( cr ) { p.setClipRect( *cr ); } else if ( !d->onlyOutside && d->eraseAreaValid ) { QRegion reg = d->eraseArea; double a; reg = reg.subtract( calcArrow( a ) ); p.setClipRegion( reg ); resetClipping = TRUE; } QRect br( calcDial() ); p.setPen( NoPen ); // if ( style() == MotifStyle ) // p.setBrush( colorGroup().brush( QColorGroup::Mid ) ); // else { QBrush b; if ( colorGroup().brush( QColorGroup::Light ).pixmap() ) b = QBrush( colorGroup().brush( QColorGroup::Light ) ); else b = QBrush( colorGroup().light(), Dense4Pattern ); p.setBrush( b ); p.setBackgroundMode( OpaqueMode ); // } QRect te = br; te.setWidth(te.width()+2); te.setHeight(te.height()+2); // erase background of dial if ( !d->onlyOutside ) { p.drawEllipse( te ); } // erase remaining space around the dial QRegion remaining( 0, 0, width(), height() ); remaining = remaining.subtract( QRegion( te, QRegion::Ellipse ) ); if ( p.hasClipping() ) remaining = remaining.intersect( p.clipRegion() ); erase(remaining); if ( resetClipping ) { if ( cr ) p.setClipRect( *cr ); else p.setClipRect( QRect( 0, 0, width(), height() ) ); } // draw notches if ( d->showNotches ) { calcLines(); p.setPen( colorGroup().foreground() ); p.drawLineSegments( d->lines ); } // calculate and paint arrow p.setPen( QPen( colorGroup().dark() ) ); p.drawArc( te, 60 * 16, 180 * 16 ); p.setPen( QPen( colorGroup().light() ) ); p.drawArc( te, 240 * 16, 180 * 16 ); double a; QPointArray arrow( calcArrow( a ) ); QRect ea( arrow.boundingRect() ); d->eraseArea = ea; d->eraseAreaValid = TRUE; p.setPen( NoPen ); p.setBrush( colorGroup().brush( QColorGroup::Button ) ); if ( !d->onlyOutside ) p.drawPolygon( arrow ); a = angle( QPoint( width() / 2, height() / 2 ), arrow[ 0 ] ); p.setBrush( Qt::NoBrush ); // that's still a hack... if ( a <= 0 || a > 200 ) { p.setPen( colorGroup().light() ); p.drawLine( arrow[ 2 ], arrow[ 0 ] ); p.drawLine( arrow[ 1 ], arrow[ 2 ] ); p.setPen( colorGroup().dark() ); p.drawLine( arrow[ 0 ], arrow[ 1 ] ); } else if ( a > 0 && a < 45 ) { p.setPen( colorGroup().light() ); p.drawLine( arrow[ 2 ], arrow[ 0 ] ); p.setPen( colorGroup().dark() ); p.drawLine( arrow[ 1 ], arrow[ 2 ] ); p.drawLine( arrow[ 0 ], arrow[ 1 ] ); } else if ( a >= 45 && a < 135 ) { p.setPen( colorGroup().dark() ); p.drawLine( arrow[ 2 ], arrow[ 0 ] ); p.drawLine( arrow[ 1 ], arrow[ 2 ] ); p.setPen( colorGroup().light() ); p.drawLine( arrow[ 0 ], arrow[ 1 ] ); } else if ( a >= 135 && a < 200 ) { p.setPen( colorGroup().dark() ); p.drawLine( arrow[ 2 ], arrow[ 0 ] ); p.setPen( colorGroup().light() ); p.drawLine( arrow[ 0 ], arrow[ 1 ] ); p.drawLine( arrow[ 1 ], arrow[ 2 ] ); } // draw focus rect around the dial if ( hasFocus() ) { p.setClipping( FALSE ); br.setWidth( br.width() + 2 ); br.setHeight( br.height() + 2 ); if ( d->showNotches ) { int r = QMIN( width(), height() ) / 2; br.moveBy( -r / 6, - r / 6 ); br.setWidth( br.width() + r / 3 ); br.setHeight( br.height() + r / 3 ); } // strange, but else we get redraw errors on Windows p.end(); p.begin( this ); p.save(); p.setPen( QPen( colorGroup().background() ) ); p.setBrush( NoBrush ); p.drawRect( br ); p.restore(); style().drawPrimitive( QStyle::PE_FocusRect, &p, br, colorGroup()); } p.end(); } /*! \reimp */ void QDial::keyPressEvent( QKeyEvent * e ) { switch ( e->key() ) { case Key_Left: case Key_Down: subtractLine(); break; case Key_Right: case Key_Up: addLine(); break; case Key_Prior: subtractPage(); break; case Key_Next: addPage(); break; case Key_Home: setValue( minValue() ); break; case Key_End: setValue( maxValue() ); break; default: e->ignore(); break; } } /*! \reimp */ void QDial::mousePressEvent( QMouseEvent * e ) { d->mousePressed = TRUE; setValue( valueFromPoint( e->pos() ) ); emit dialPressed(); } /*! \reimp */ void QDial::mouseReleaseEvent( QMouseEvent * e ) { d->mousePressed = FALSE; setValue( valueFromPoint( e->pos() ) ); emit dialReleased(); } /*! \reimp */ void QDial::mouseMoveEvent( QMouseEvent * e ) { if ( !d->mousePressed ) return; if ( !d->tracking || (e->state() & LeftButton) == 0 ) return; d->doNotEmit = TRUE; setValue( valueFromPoint( e->pos() ) ); emit dialMoved( value() ); d->doNotEmit = FALSE; } /*! \reimp */ #ifndef QT_NO_WHEELEVENT void QDial::wheelEvent( QWheelEvent *e ) { setValue( value() - e->delta() / 120 ); } #endif /*! \reimp */ void QDial::focusInEvent( QFocusEvent * ) { d->onlyOutside = TRUE; repaintScreen(); d->onlyOutside = FALSE; } /*! \reimp */ void QDial::focusOutEvent( QFocusEvent * ) { d->onlyOutside = TRUE; repaintScreen(); d->onlyOutside = FALSE; } /*! Reimplemented to ensure the display is correct and to emit the valueChanged(int) signal when appropriate. */ void QDial::valueChange() { d->lines.resize( 0 ); repaintScreen(); if ( d->tracking || !d->doNotEmit ) { emit valueChanged( value() ); #if defined(QT_ACCESSIBILITY_SUPPORT) QAccessible::updateAccessibility( this, 0, QAccessible::ValueChanged ); #endif } } /*! Reimplemented to ensure tick-marks are consistent with the new range. */ void QDial::rangeChange() { d->lines.resize( 0 ); repaintScreen(); } /*! \internal */ int QDial::valueFromPoint( const QPoint & p ) const { double yy = (double)height()/2.0 - p.y(); double xx = (double)p.x() - width()/2.0; double a = (xx || yy) ? atan2(yy, xx) : 0; if ( a < m_pi/-2 ) a = a + m_pi*2; int dist = 0; int minv = minValue(), maxv = maxValue(); if ( minValue() < 0 ) { dist = -minValue(); minv = 0; maxv = maxValue() + dist; } int r = maxv - minv; int v; if ( d->wrapping ) v = (int)(0.5 + minv + r*(m_pi*3/2-a)/(2*m_pi)); else v = (int)(0.5 + minv + r*(m_pi*4/3-a)/(m_pi*10/6)); if ( dist > 0 ) v -= dist; return bound( v ); } /*! \internal */ double QDial::angle( const QPoint &p1, const QPoint &p2 ) const { double _angle = 0.0; if ( p1.x() == p2.x() ) { if ( p1.y() < p2.y() ) _angle = 270.0; else _angle = 90.0; } else { double x1, x2, y1, y2; if ( p1.x() <= p2.x() ) { x1 = p1.x(); y1 = p1.y(); x2 = p2.x(); y2 = p2.y(); } else { x2 = p1.x(); y2 = p1.y(); x1 = p2.x(); y1 = p2.y(); } double m = -( y2 - y1 ) / ( x2 - x1 ); _angle = atan( m ) * rad_factor; if ( p1.x() < p2.x() ) _angle = 180.0 - _angle; else _angle = -_angle; } return _angle; } void QDial::setWrapping( bool enable ) { if ( d->wrapping == enable ) return; d->lines.resize( 0 ); d->wrapping = enable; d->eraseAreaValid = FALSE; repaintScreen(); } /*! \property QDial::wrapping \brief whether wrapping is enabled If TRUE, wrapping is enabled. This means that the arrow can be turned around 360°. Otherwise there is some space at the bottom of the dial which is skipped by the arrow. This property's default is FALSE. */ bool QDial::wrapping() const { return d->wrapping; } /*! \property QDial::notchSize \brief the current notch size The notch size is in range control units, not pixels, and if possible it is a multiple of lineStep() that results in an on-screen notch size near notchTarget(). \sa notchTarget() lineStep() */ int QDial::notchSize() const { // radius of the arc int r = QMIN( width(), height() )/2; // length of the whole arc int l = (int)(r*(d->wrapping ? 6 : 5)*m_pi/6); // length of the arc from minValue() to minValue()+pageStep() if ( maxValue() > minValue()+pageStep() ) l = (int)(0.5 + l * pageStep() / (maxValue()-minValue())); // length of a lineStep() arc l = l * lineStep() / pageStep(); if ( l < 1 ) l = 1; // how many times lineStep can be draw in d->target pixels l = (int)(0.5 + d->target / l); // we want notchSize() to be a non-zero multiple of lineStep() if ( !l ) l = 1; return lineStep() * l; } void QDial::setNotchTarget( double target ) { d->lines.resize( 0 ); d->target = target; d->eraseAreaValid = FALSE; d->onlyOutside = TRUE; repaintScreen(); d->onlyOutside = FALSE; } /*! \property QDial::notchTarget \brief the target number of pixels between notches The notch target is the number of pixels QDial attempts to put between each notch. The actual size may differ from the target size. */ double QDial::notchTarget() const { return d->target; } /*! Increments the dial's value() by one pageStep() of steps. */ void QDial::addPage() { QRangeControl::addPage(); } /*! Decrements the dial's value() by one pageStep() of steps. */ void QDial::subtractPage() { QRangeControl::subtractPage(); } /*! \fn void QDial::valueChanged( int value ) This signal is emitted whenever the dial's \a value changes. The frequency of this signal is influenced by setTracking(). */ /*! \fn void QDial::dialPressed() This signal is emitted when the user begins mouse interaction with the dial. \sa dialReleased() */ /*! \fn void QDial::dialMoved( int value ) This signal is emitted whenever the dial \a value changes. The frequency of this signal is \e not influenced by setTracking(). \sa valueChanged() */ /*! \fn void QDial::dialReleased() This signal is emitted when the user ends mouse interaction with the dial. \sa dialPressed() */ void QDial::setNotchesVisible( bool b ) { d->showNotches = b; d->eraseAreaValid = FALSE; d->onlyOutside = TRUE; repaintScreen(); d->onlyOutside = FALSE; } /*! \property QDial::notchesVisible \brief whether the notches are shown If TRUE, the notches are shown. If FALSE (the default) notches are not shown. */ bool QDial::notchesVisible() const { return d->showNotches; } /*! \reimp */ QSize QDial::minimumSizeHint() const { return QSize( 50, 50 ); } /*! \reimp */ QSize QDial::sizeHint() const { return QSize( 100, 100 ).expandedTo( QApplication::globalStrut() ); } /*! \internal */ QPointArray QDial::calcArrow( double &a ) const { int r = QMIN( width(), height() ) / 2; if ( maxValue() == minValue() ) a = m_pi / 2; else if ( d->wrapping ) a = m_pi * 3 / 2 - ( value() - minValue() ) * 2 * m_pi / ( maxValue() - minValue() ); else a = ( m_pi * 8 - ( value() - minValue() ) * 10 * m_pi / ( maxValue() - minValue() ) ) / 6; int xc = width() / 2; int yc = height() / 2; int len = r - calcBigLineSize() - 5; if ( len < 5 ) len = 5; int back = len / 4; if ( back < 1 ) back = 1; QPointArray arrow( 3 ); arrow[0] = QPoint( (int)( 0.5 + xc + len * cos(a) ), (int)( 0.5 + yc -len * sin( a ) ) ); arrow[1] = QPoint( (int)( 0.5 + xc + back * cos( a + m_pi * 5 / 6 ) ), (int)( 0.5 + yc - back * sin( a + m_pi * 5 / 6 ) ) ); arrow[2] = QPoint( (int)( 0.5 + xc + back * cos( a - m_pi * 5 / 6 ) ), (int)( 0.5 + yc - back * sin( a - m_pi * 5 / 6 ) ) ); return arrow; } /*! \internal */ QRect QDial::calcDial() const { double r = QMIN( width(), height() ) / 2.0; double d_ = r / 6.0; double dx = d_ + ( width() - 2 * r ) / 2.0 + 1; double dy = d_ + ( height() - 2 * r ) / 2.0 + 1; return QRect( int(dx), int(dy), int(r * 2 - 2 * d_ - 2), int(r * 2 - 2 * d_ - 2) ); } /*! \internal */ int QDial::calcBigLineSize() const { int r = QMIN( width(), height() ) / 2; int bigLineSize = r / 6; if ( bigLineSize < 4 ) bigLineSize = 4; if ( bigLineSize > r / 2 ) bigLineSize = r / 2; return bigLineSize; } /*! \internal */ void QDial::calcLines() { if ( !d->lines.size() ) { double r = QMIN( width(), height() ) / 2.0; int bigLineSize = calcBigLineSize(); double xc = width() / 2.0; double yc = height() / 2.0; int ns = notchSize(); int notches = ( maxValue() + ns - 1 - minValue() ) / ns; d->lines.resize( 2 + 2 * notches ); int smallLineSize = bigLineSize / 2; int i; for( i = 0; i <= notches; i++ ) { double angle = d->wrapping ? m_pi * 3 / 2 - i * 2 * m_pi / notches : (m_pi * 8 - i * 10 * m_pi / notches) / 6; double s = sin( angle ); // sin/cos aren't defined as const... double c = cos( angle ); if ( i == 0 || ( ((ns * i ) % pageStep() ) == 0 ) ) { d->lines[2*i] = QPoint( (int)( xc + ( r - bigLineSize ) * c ), (int)( yc - ( r - bigLineSize ) * s ) ); d->lines[2*i+1] = QPoint( (int)( xc + r * c ), (int)( yc - r * s ) ); } else { d->lines[2*i] = QPoint( (int)( xc + ( r - 1 - smallLineSize ) * c ), (int)( yc - ( r - 1 - smallLineSize ) * s ) ); d->lines[2*i+1] = QPoint( (int)( xc + ( r - 1 ) * c ), (int)( yc -( r - 1 ) * s ) ); } } } } /*! \property QDial::minValue \brief the current minimum value When setting this property, the \l QDial::maxValue is adjusted if necessary to ensure that the range remains valid. \sa setRange() */ int QDial::minValue() const { return QRangeControl::minValue(); } /*! \property QDial::maxValue \brief the current maximum value When setting this property, the \l QDial::minValue is adjusted if necessary to ensure that the range remains valid. \sa setRange() */ int QDial::maxValue() const { return QRangeControl::maxValue(); } void QDial::setMinValue( int minVal ) { QRangeControl::setMinValue( minVal ); } void QDial::setMaxValue( int maxVal ) { QRangeControl::setMaxValue( maxVal ); } /*! \property QDial::lineStep \brief the current line step setLineStep() calls the virtual stepChange() function if the new line step is different from the previous setting. \sa QRangeControl::setSteps() pageStep setRange() */ int QDial::lineStep() const { return QRangeControl::lineStep(); } /*! \property QDial::pageStep \brief the current page step setPageStep() calls the virtual stepChange() function if the new page step is different from the previous setting. \sa stepChange() */ int QDial::pageStep() const { return QRangeControl::pageStep(); } void QDial::setLineStep( int i ) { setSteps( i, pageStep() ); } void QDial::setPageStep( int i ) { setSteps( lineStep(), i ); } /*! \property QDial::value \brief the current dial value This is guaranteed to be within the range \l{QDial::minValue}..\l{QDial::maxValue}. \sa minValue maxValue */ int QDial::value() const { return QRangeControl::value(); } #endif // QT_FEATURE_DIAL