/**************************************************************************** ** ** 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 QtGui module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the Technology Preview License Agreement accompanying ** this package. ** ** 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. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qdial.h" #ifndef QT_NO_DIAL #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef QT_NO_ACCESSIBILITY #include "qaccessible.h" #endif QT_BEGIN_NAMESPACE class QDialPrivate : public QAbstractSliderPrivate { Q_DECLARE_PUBLIC(QDial) public: QDialPrivate() { wrapping = false; tracking = true; doNotEmit = false; target = qreal(3.7); } qreal target; uint showNotches : 1; uint wrapping : 1; uint doNotEmit : 1; int valueFromPoint(const QPoint &) const; double angle(const QPoint &, const QPoint &) const; void init(); }; void QDialPrivate::init() { Q_Q(QDial); showNotches = false; q->setFocusPolicy(Qt::WheelFocus); #ifdef QT3_SUPPORT QObject::connect(q, SIGNAL(sliderPressed()), q, SIGNAL(dialPressed())); QObject::connect(q, SIGNAL(sliderMoved(int)), q, SIGNAL(dialMoved(int))); QObject::connect(q, SIGNAL(sliderReleased()), q, SIGNAL(dialReleased())); #endif } /*! Initialize \a option with the values from this QDial. This method is useful for subclasses when they need a QStyleOptionSlider, but don't want to fill in all the information themselves. \sa QStyleOption::initFrom() */ void QDial::initStyleOption(QStyleOptionSlider *option) const { if (!option) return; Q_D(const QDial); option->initFrom(this); option->minimum = d->minimum; option->maximum = d->maximum; option->sliderPosition = d->position; option->sliderValue = d->value; option->singleStep = d->singleStep; option->pageStep = d->pageStep; option->upsideDown = !d->invertedAppearance; option->notchTarget = d->target; option->dialWrapping = d->wrapping; option->subControls = QStyle::SC_All; option->activeSubControls = QStyle::SC_None; if (!d->showNotches) { option->subControls &= ~QStyle::SC_DialTickmarks; option->tickPosition = QSlider::TicksAbove; } else { option->tickPosition = QSlider::NoTicks; } option->tickInterval = notchSize(); } int QDialPrivate::valueFromPoint(const QPoint &p) const { Q_Q(const QDial); double yy = (double)q->height()/2.0 - p.y(); double xx = (double)p.x() - q->width()/2.0; double a = (xx || yy) ? atan2(yy, xx) : 0; if (a < Q_PI / -2) a = a + Q_PI * 2; int dist = 0; int minv = minimum, maxv = maximum; if (minimum < 0) { dist = -minimum; minv = 0; maxv = maximum + dist; } int r = maxv - minv; int v; if (wrapping) v = (int)(0.5 + minv + r * (Q_PI * 3 / 2 - a) / (2 * Q_PI)); else v = (int)(0.5 + minv + r* (Q_PI * 4 / 3 - a) / (Q_PI * 10 / 6)); if (dist > 0) v -= dist; return !invertedAppearance ? bound(v) : maximum - bound(v); } /*! \class QDial \brief The QDial class provides a rounded range control (like a speedometer or potentiometer). \ingroup basicwidgets \mainclass QDial is used when the user needs to control a value within a program-definable range, and the range either wraps around (for example, with angles measured from 0 to 359 degrees) or the dialog layout needs a square widget. Since QDial inherits from QAbstractSlider, the dial behaves in a similar way to a \l{QSlider}{slider}. When wrapping() is false (the default setting) there is no real difference between a slider and a dial. They both share the same signals, slots and member functions. Which one you use depends on the expectations of your users and on the type of application. The dial initially emits valueChanged() signals continuously while the slider is being moved; you can make it emit the signal less often by disabling the \l{QAbstractSlider::tracking} {tracking} property. The sliderMoved() signal is emitted continuously even when tracking is disabled. The dial also emits sliderPressed() and sliderReleased() signals when the mouse button is pressed and released. Note that the dial's value can change without these signals being emitted since the keyboard and wheel can also be used to change the value. Unlike the slider, QDial attempts to draw a "nice" number of notches rather than one per line step. If possible, the number of notches drawn is one per line step, but if there aren't enough pixels to draw every one, QDial will skip notches to try and draw a uniform set (e.g. by drawing every second or third notch). Like the slider, the dial makes the QAbstractSlider functions setValue(), addLine(), subtractLine(), addPage() and subtractPage() available as slots. The dial's keyboard interface is fairly simple: The \key{left}/\key{up} and \key{right}/\key{down} arrow keys adjust the dial's \l {QAbstractSlider::value} {value} by the defined \l {QAbstractSlider::singleStep} {singleStep}, \key{Page Up} and \key{Page Down} by the defined \l {QAbstractSlider::pageStep} {pageStep}, and the \key Home and \key End keys set the value to the defined \l {QAbstractSlider::minimum} {minimum} and \l {QAbstractSlider::maximum} {maximum} values. If you are using the mouse wheel to adjust the dial, the increment value is determined by the lesser value of \l{QApplication::wheelScrollLines()} {wheelScrollLines} multipled by \l {QAbstractSlider::singleStep} {singleStep}, and \l {QAbstractSlider::pageStep} {pageStep}. \table \row \o \inlineimage plastique-dial.png Screenshot of a dial in the Plastique widget style \o \inlineimage windowsxp-dial.png Screenshot of a dial in the Windows XP widget style \o \inlineimage macintosh-dial.png Screenshot of a dial in the Macintosh widget style \row \o {3,1} Dials shown in various widget styles (from left to right): \l{Plastique Style Widget Gallery}{Plastique}, \l{Windows XP Style Widget Gallery}{Windows XP}, \l{Macintosh Style Widget Gallery}{Macintosh}. \endtable \sa QScrollBar, QSpinBox, QSlider, {fowler}{GUI Design Handbook: Slider}, {Sliders Example} */ /*! Constructs a dial. The \a parent argument is sent to the QAbstractSlider constructor. */ QDial::QDial(QWidget *parent) : QAbstractSlider(*new QDialPrivate, parent) { Q_D(QDial); d->init(); } #ifdef QT3_SUPPORT /*! Use one of the constructors that doesn't take the \a name argument and then use setObjectName() instead. */ QDial::QDial(QWidget *parent, const char *name) : QAbstractSlider(*new QDialPrivate, parent) { Q_D(QDial); setObjectName(QString::fromAscii(name)); d->init(); } /*! Use one of the constructors that doesn't take the \a name argument and then use setObjectName() instead. */ QDial::QDial(int minValue, int maxValue, int pageStep, int value, QWidget *parent, const char *name) : QAbstractSlider(*new QDialPrivate, parent) { Q_D(QDial); setObjectName(QString::fromAscii(name)); d->minimum = minValue; d->maximum = maxValue; d->pageStep = pageStep; d->position = d->value = value; d->init(); } #endif /*! Destroys the dial. */ QDial::~QDial() { } /*! \reimp */ void QDial::resizeEvent(QResizeEvent *e) { QWidget::resizeEvent(e); } /*! \reimp */ void QDial::paintEvent(QPaintEvent *) { QStylePainter p(this); QStyleOptionSlider option; initStyleOption(&option); p.drawComplexControl(QStyle::CC_Dial, option); } /*! \reimp */ void QDial::mousePressEvent(QMouseEvent *e) { Q_D(QDial); if (d->maximum == d->minimum || (e->button() != Qt::LeftButton) || (e->buttons() ^ e->button())) { e->ignore(); return; } e->accept(); setSliderPosition(d->valueFromPoint(e->pos())); // ### This isn't quite right, // we should be doing a hit test and only setting this if it's // the actual dial thingie (similar to what QSlider does), but we have no // subControls for QDial. setSliderDown(true); } /*! \reimp */ void QDial::mouseReleaseEvent(QMouseEvent * e) { Q_D(QDial); if (e->buttons() & (~e->button()) || (e->button() != Qt::LeftButton)) { e->ignore(); return; } e->accept(); setValue(d->valueFromPoint(e->pos())); setSliderDown(false); } /*! \reimp */ void QDial::mouseMoveEvent(QMouseEvent * e) { Q_D(QDial); if (!(e->buttons() & Qt::LeftButton)) { e->ignore(); return; } e->accept(); d->doNotEmit = true; setSliderPosition(d->valueFromPoint(e->pos())); d->doNotEmit = false; } /*! \reimp */ void QDial::sliderChange(SliderChange change) { QAbstractSlider::sliderChange(change); } void QDial::setWrapping(bool enable) { Q_D(QDial); if (d->wrapping == enable) return; d->wrapping = enable; update(); } /*! \property QDial::wrapping \brief whether wrapping is enabled If true, wrapping is enabled; otherwise some space is inserted at the bottom of the dial to separate the ends of the range of valid values. If enabled, the arrow can be oriented at any angle on the dial. If disabled, the arrow will be restricted to the upper part of the dial; if it is rotated into the space at the bottom of the dial, it will be clamped to the closest end of the valid range of values. By default this property is false. */ bool QDial::wrapping() const { Q_D(const QDial); 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 singleStep() that results in an on-screen notch size near notchTarget(). By default, this property has a value of 1. \sa notchTarget(), singleStep() */ int QDial::notchSize() const { Q_D(const QDial); // radius of the arc int r = qMin(width(), height())/2; // length of the whole arc int l = (int)(r * (d->wrapping ? 6 : 5) * Q_PI / 6); // length of the arc from minValue() to minValue()+pageStep() if (d->maximum > d->minimum + d->pageStep) l = (int)(0.5 + l * d->pageStep / (d->maximum - d->minimum)); // length of a singleStep arc l = l * d->singleStep / (d->pageStep ? d->pageStep : 1); if (l < 1) l = 1; // how many times singleStep 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 d->singleStep * l; } void QDial::setNotchTarget(double target) { Q_D(QDial); d->target = target; update(); } /*! \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. The default notch target is 3.7 pixels. */ qreal QDial::notchTarget() const { Q_D(const QDial); return d->target; } void QDial::setNotchesVisible(bool visible) { Q_D(QDial); d->showNotches = visible; update(); } /*! \property QDial::notchesVisible \brief whether the notches are shown If the property is true, a series of notches are drawn around the dial to indicate the range of values available; otherwise no notches are shown. By default, this property is disabled. */ bool QDial::notchesVisible() const { Q_D(const QDial); return d->showNotches; } /*! \reimp */ QSize QDial::minimumSizeHint() const { return QSize(50, 50); } /*! \reimp */ QSize QDial::sizeHint() const { return QSize(100, 100).expandedTo(QApplication::globalStrut()); } /*! \reimp */ bool QDial::event(QEvent *e) { return QAbstractSlider::event(e); } /*! \fn void QDial::dialPressed(); Use QAbstractSlider::sliderPressed() instead. */ /*! \fn void QDial::dialMoved(int value); Use QAbstractSlider::sliderMoved() instead. */ /*! \fn void QDial::dialReleased(); Use QAbstractSlider::sliderReleased() instead. */ QT_END_NAMESPACE #endif // QT_NO_DIAL