QwtWheel(3) Qwt User's Guide QwtWheel(3) NAME QwtWheel - The Wheel Widget. SYNOPSIS #include Inherits QWidget. Public Slots void setValue (double) Set a new value without adjusting to the step raster. void setTotalAngle (double) Set the total angle which the wheel can be turned. void setViewAngle (double) Specify the visible portion of the wheel. void setMass (double) Set the slider's mass for flywheel effect. Signals void valueChanged (double value) Notify a change of value. void wheelPressed () void wheelReleased () void wheelMoved (double value) Public Member Functions QwtWheel (QWidget *parent=NULL) Constructor. virtual ~QwtWheel () Destructor. double value () const void setOrientation (Qt::Orientation) Set the wheel's orientation. Qt::Orientation orientation () const double totalAngle () const double viewAngle () const void setTickCount (int) Adjust the number of grooves in the wheel's surface. int tickCount () const void setWheelWidth (int) Set the width of the wheel. int wheelWidth () const void setWheelBorderWidth (int) Set the wheel border width of the wheel. int wheelBorderWidth () const void setBorderWidth (int) Set the border width. int borderWidth () const void setInverted (bool) En/Disable inverted appearance. bool isInverted () const void setWrapping (bool) En/Disable wrapping. bool wrapping () const void setSingleStep (double) Set the step size of the counter. double singleStep () const void setPageStepCount (int) Set the page step count. int pageStepCount () const void setStepAlignment (bool on) En/Disable step alignment. bool stepAlignment () const void setRange (double min, double max) Set the minimum and maximum values. void setMinimum (double) double minimum () const void setMaximum (double) double maximum () const void setUpdateInterval (int) Specify the update interval when the wheel is flying. int updateInterval () const void setTracking (bool) En/Disable tracking. bool isTracking () const double mass () const Protected Member Functions virtual void paintEvent (QPaintEvent *) override Qt Paint Event. virtual void mousePressEvent (QMouseEvent *) override Mouse press event handler. virtual void mouseReleaseEvent (QMouseEvent *) override Mouse Release Event handler. virtual void mouseMoveEvent (QMouseEvent *) override Mouse Move Event handler. virtual void keyPressEvent (QKeyEvent *) override virtual void wheelEvent (QWheelEvent *) override Handle wheel events. virtual void timerEvent (QTimerEvent *) override Qt timer event. void stopFlying () Stop the flying movement of the wheel. QRect wheelRect () const virtual QSize sizeHint () const override virtual QSize minimumSizeHint () const override virtual void drawTicks (QPainter *, const QRectF &) virtual void drawWheelBackground (QPainter *, const QRectF &) virtual double valueAt (const QPoint &) const Detailed Description The Wheel Widget. The wheel widget can be used to change values over a very large range in very small steps. Using the setMass() member, it can be configured as a flying wheel. The default range of the wheel is [0.0, 100.0] See also The radio example. Definition at line 27 of file qwt_wheel.h. Member Function Documentation int QwtWheel::borderWidth () const Returns Border width See also setBorderWidth() Definition at line 586 of file qwt_wheel.cpp. void QwtWheel::drawTicks (QPainter * painter, const QRectF & rect) [protected], [virtual] Draw the Wheel's ticks Parameters painter Painter rect Geometry for the wheel Definition at line 817 of file qwt_wheel.cpp. void QwtWheel::drawWheelBackground (QPainter * painter, const QRectF & rect) [protected], [virtual] Draw the Wheel's background gradient Parameters painter Painter rect Geometry for the wheel Definition at line 761 of file qwt_wheel.cpp. bool QwtWheel::isInverted () const Returns True, when the wheel is inverted See also setInverted() Definition at line 1176 of file qwt_wheel.cpp. bool QwtWheel::isTracking () const Returns True, when tracking is enabled See also setTracking(), valueChanged(), wheelMoved() Definition at line 129 of file qwt_wheel.cpp. void QwtWheel::keyPressEvent (QKeyEvent * event) [override], [protected], [virtual] Handle key events o Qt::Key_Home Step to minimum() o Qt::Key_End Step to maximum() o Qt::Key_Up In case of a horizontal or not inverted vertical wheel the value will be incremented by the step size. For an inverted vertical wheel the value will be decremented by the step size. o Qt::Key_Down In case of a horizontal or not inverted vertical wheel the value will be decremented by the step size. For an inverted vertical wheel the value will be incremented by the step size. o Qt::Key_PageUp The value will be incremented by pageStepSize() * singleStepSize(). o Qt::Key_PageDown The value will be decremented by pageStepSize() * singleStepSize(). Parameters event Key event Definition at line 409 of file qwt_wheel.cpp. double QwtWheel::mass () const Returns mass See also setMass() Definition at line 1240 of file qwt_wheel.cpp. double QwtWheel::maximum () const Returns The maximum of the range See also setRange(), setMaximum(), minimum() Definition at line 1114 of file qwt_wheel.cpp. double QwtWheel::minimum () const Returns The minimum of the range See also setRange(), setMinimum(), maximum() Definition at line 1094 of file qwt_wheel.cpp. QSize QwtWheel::minimumSizeHint () const [override], [protected], [virtual] Returns Minimum size hint Warning The return value is based on the wheel width. Definition at line 962 of file qwt_wheel.cpp. void QwtWheel::mouseMoveEvent (QMouseEvent * event) [override], [protected], [virtual] Mouse Move Event handler. Turn the wheel according to the mouse position Parameters event Mouse event Definition at line 188 of file qwt_wheel.cpp. void QwtWheel::mousePressEvent (QMouseEvent * event) [override], [protected], [virtual] Mouse press event handler. Start movement of the wheel. Parameters event Mouse event Definition at line 163 of file qwt_wheel.cpp. void QwtWheel::mouseReleaseEvent (QMouseEvent * event) [override], [protected], [virtual] Mouse Release Event handler. When the wheel has no mass the movement of the wheel stops, otherwise it starts flying. Parameters event Mouse event Definition at line 237 of file qwt_wheel.cpp. Qt::Orientation QwtWheel::orientation () const Returns Orientation See also setOrientation() Definition at line 661 of file qwt_wheel.cpp. int QwtWheel::pageStepCount () const Returns Page step count See also setPageStepCount(), singleStep() Definition at line 1043 of file qwt_wheel.cpp. void QwtWheel::paintEvent (QPaintEvent * event) [override], [protected], [virtual] Qt Paint Event. Parameters event Paint event Definition at line 736 of file qwt_wheel.cpp. void QwtWheel::setBorderWidth (int width) Set the border width. The border defaults to 2. Parameters width Border width See also borderWidth() Definition at line 576 of file qwt_wheel.cpp. void QwtWheel::setInverted (bool on) En/Disable inverted appearance. An inverted wheel increases its values in the opposite direction. The direction of an inverted horizontal wheel will be from right to left an inverted vertical wheel will increase from bottom to top. Parameters on En/Disable inverted appearance See also isInverted() Definition at line 1163 of file qwt_wheel.cpp. void QwtWheel::setMass (double mass) [slot] Set the slider's mass for flywheel effect. If the slider's mass is greater then 0, it will continue to move after the mouse button has been released. Its speed decreases with time at a rate depending on the slider's mass. A large mass means that it will continue to move for a long time. Derived widgets may overload this function to make it public. Parameters mass New mass in kg See also mass() Definition at line 1221 of file qwt_wheel.cpp. void QwtWheel::setMaximum (double value) Set the maximum value of the range Parameters value Maximum value See also setRange(), setMinimum(), maximum() Definition at line 1105 of file qwt_wheel.cpp. void QwtWheel::setMinimum (double value) Set the minimum value of the range Parameters value Minimum value See also setRange(), setMaximum(), minimum() Note The maximum is adjusted if necessary to ensure that the range remains valid. Definition at line 1085 of file qwt_wheel.cpp. void QwtWheel::setOrientation (Qt::Orientation orientation) Set the wheel's orientation. The default orientation is Qt::Horizontal. Parameters orientation Qt::Horizontal or Qt::Vertical. See also orientation() Definition at line 639 of file qwt_wheel.cpp. void QwtWheel::setPageStepCount (int count) Set the page step count. pageStepCount is a multiplicator for the single step size that typically corresponds to the user pressing PageUp or PageDown. A value of 0 disables page stepping. The default value is 1. Parameters count Multiplicator for the single step size See also pageStepCount(), setSingleStep() Definition at line 1034 of file qwt_wheel.cpp. void QwtWheel::setRange (double min, double max) Set the minimum and maximum values. The maximum is adjusted if necessary to ensure that the range remains valid. The value might be modified to be inside of the range. Parameters min Minimum value max Maximum value See also minimum(), maximum() Definition at line 1059 of file qwt_wheel.cpp. void QwtWheel::setSingleStep (double stepSize) Set the step size of the counter. A value <= 0.0 disables stepping Parameters stepSize Single step size See also singleStep(), setPageStepCount() Definition at line 980 of file qwt_wheel.cpp. void QwtWheel::setStepAlignment (bool on) En/Disable step alignment. When step alignment is enabled value changes initiated by user input ( mouse, keyboard, wheel ) are aligned to the multiples of the single step. Parameters on On/Off See also stepAlignment(), setSingleStep() Definition at line 1004 of file qwt_wheel.cpp. void QwtWheel::setTickCount (int count) Adjust the number of grooves in the wheel's surface. The number of grooves is limited to 6 <= count <= 50. Values outside this range will be clipped. The default value is 10. Parameters count Number of grooves per 360 degrees See also tickCount() Definition at line 519 of file qwt_wheel.cpp. void QwtWheel::setTotalAngle (double angle) [slot] Set the total angle which the wheel can be turned. One full turn of the wheel corresponds to an angle of 360 degrees. A total angle of n*360 degrees means that the wheel has to be turned n times around its axis to get from the minimum value to the maximum value. The default setting of the total angle is 360 degrees. Parameters angle total angle in degrees See also totalAngle() Definition at line 613 of file qwt_wheel.cpp. void QwtWheel::setTracking (bool enable) En/Disable tracking. If tracking is enabled (the default), the wheel emits the valueChanged() signal while the wheel is moving. If tracking is disabled, the wheel emits the valueChanged() signal only when the wheel movement is terminated. The wheelMoved() signal is emitted regardless id tracking is enabled or not. Parameters enable On/Off See also isTracking() Definition at line 120 of file qwt_wheel.cpp. void QwtWheel::setUpdateInterval (int interval) Specify the update interval when the wheel is flying. Default and minimum value is 50 ms. Parameters interval Interval in milliseconds See also updateInterval(), setMass(), setTracking() Definition at line 142 of file qwt_wheel.cpp. void QwtWheel::setValue (double value) [slot] Set a new value without adjusting to the step raster. Parameters value New value See also value(), valueChanged() Warning The value is clipped when it lies outside the range. Definition at line 1127 of file qwt_wheel.cpp. void QwtWheel::setViewAngle (double angle) [slot] Specify the visible portion of the wheel. You may use this function for fine-tuning the appearance of the wheel. The default value is 175 degrees. The value is limited from 10 to 175 degrees. Parameters angle Visible angle in degrees See also viewAngle(), setTotalAngle() Definition at line 676 of file qwt_wheel.cpp. void QwtWheel::setWheelBorderWidth (int borderWidth) Set the wheel border width of the wheel. The wheel border must not be smaller than 1 and is limited in dependence on the wheel's size. Values outside the allowed range will be clipped. The wheel border defaults to 2. Parameters borderWidth Border width See also internalBorder() Definition at line 551 of file qwt_wheel.cpp. void QwtWheel::setWheelWidth (int width) Set the width of the wheel. Corresponds to the wheel height for horizontal orientation, and the wheel width for vertical orientation. Parameters width the wheel's width See also wheelWidth() Definition at line 934 of file qwt_wheel.cpp. void QwtWheel::setWrapping (bool on) En/Disable wrapping. If wrapping is true stepping up from maximum() value will take you to the minimum() value and vice versa. Parameters on En/Disable wrapping See also wrapping() Definition at line 1190 of file qwt_wheel.cpp. double QwtWheel::singleStep () const Returns Single step size See also setSingleStep() Definition at line 989 of file qwt_wheel.cpp. QSize QwtWheel::sizeHint () const [override], [protected], [virtual] Returns a size hint Definition at line 952 of file qwt_wheel.cpp. bool QwtWheel::stepAlignment () const Returns True, when the step alignment is enabled See also setStepAlignment(), singleStep() Definition at line 1016 of file qwt_wheel.cpp. int QwtWheel::tickCount () const Returns Number of grooves in the wheel's surface. See also setTickCnt() Definition at line 534 of file qwt_wheel.cpp. void QwtWheel::timerEvent (QTimerEvent * event) [override], [protected], [virtual] Qt timer event. The flying wheel effect is implemented using a timer Parameters event Timer event See also updateInterval() Definition at line 283 of file qwt_wheel.cpp. double QwtWheel::totalAngle () const Returns Total angle which the wheel can be turned. See also setTotalAngle() Definition at line 626 of file qwt_wheel.cpp. int QwtWheel::updateInterval () const Returns Update interval when the wheel is flying See also setUpdateInterval(), mass(), isTracking() Definition at line 151 of file qwt_wheel.cpp. double QwtWheel::value () const Returns Current value of the wheel See also setValue(), valueChanged() Definition at line 1147 of file qwt_wheel.cpp. double QwtWheel::valueAt (const QPoint & pos) const [protected], [virtual] Determine the value corresponding to a specified point Parameters pos Position Returns Value corresponding to pos Definition at line 697 of file qwt_wheel.cpp. void QwtWheel::valueChanged (double value) [signal] Notify a change of value. When tracking is enabled this signal will be emitted every time the value changes. Parameters value new value See also setTracking() double QwtWheel::viewAngle () const Returns Visible portion of the wheel See also setViewAngle(), totalAngle() Definition at line 686 of file qwt_wheel.cpp. int QwtWheel::wheelBorderWidth () const Returns Wheel border width See also setWheelBorderWidth() Definition at line 563 of file qwt_wheel.cpp. void QwtWheel::wheelEvent (QWheelEvent * event) [override], [protected], [virtual] Handle wheel events. In/Decrement the value Parameters event Wheel event Definition at line 324 of file qwt_wheel.cpp. void QwtWheel::wheelMoved (double value) [signal] This signal is emitted when the user moves the wheel with the mouse. Parameters value new value void QwtWheel::wheelPressed () [signal] This signal is emitted when the user presses the the wheel with the mouse QRect QwtWheel::wheelRect () const [protected] Returns Rectangle of the wheel without the outer border Definition at line 594 of file qwt_wheel.cpp. void QwtWheel::wheelReleased () [signal] This signal is emitted when the user releases the mouse int QwtWheel::wheelWidth () const Returns Width of the wheel See also setWheelWidth() Definition at line 944 of file qwt_wheel.cpp. bool QwtWheel::wrapping () const Returns True, when wrapping is set See also setWrapping() Definition at line 1199 of file qwt_wheel.cpp. Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.2.0 Sun Jul 18 2021 QwtWheel(3)