QwtCounter(3) Qwt User's Guide QwtCounter(3) NAME QwtCounter - The Counter Widget. SYNOPSIS #include Inherits QWidget. Public Types enum Button { Button1, Button2, Button3, ButtonCnt } Button index. Public Slots void setValue (double) Set a new value without adjusting to the step raster. Signals void buttonReleased (double value) void valueChanged (double value) Public Member Functions QwtCounter (QWidget *parent=NULL) virtual ~QwtCounter () Destructor. void setValid (bool) bool isValid () const void setWrapping (bool) En/Disable wrapping. bool wrapping () const bool isReadOnly () const void setReadOnly (bool) Allow/disallow the user to manually edit the value. void setNumButtons (int) int numButtons () const void setIncSteps (QwtCounter::Button, int numSteps) int incSteps (QwtCounter::Button) const virtual QSize sizeHint () const override A size hint. double singleStep () const void setSingleStep (double stepSize) Set the step size of the counter. void setRange (double min, double max) Set the minimum and maximum values. double minimum () const void setMinimum (double) double maximum () const void setMaximum (double) void setStepButton1 (int nSteps) int stepButton1 () const returns the number of increment steps for button 1 void setStepButton2 (int nSteps) int stepButton2 () const returns the number of increment steps for button 2 void setStepButton3 (int nSteps) int stepButton3 () const returns the number of increment steps for button 3 double value () const Protected Member Functions virtual bool event (QEvent *) override virtual void wheelEvent (QWheelEvent *) override virtual void keyPressEvent (QKeyEvent *) override Detailed Description The Counter Widget. A Counter consists of a label displaying a number and one ore more (up to three) push buttons on each side of the label which can be used to increment or decrement the counter's value. A counter has a range from a minimum value to a maximum value and a step size. When the wrapping property is set the counter is circular. The number of steps by which a button increments or decrements the value can be specified using setIncSteps(). The number of buttons can be changed with setNumButtons(). Example: #include QwtCounter *counter = new QwtCounter(parent); counter->setRange(0.0, 100.0); // From 0.0 to 100 counter->setSingleStep( 1.0 ); // Step size 1.0 counter->setNumButtons(2); // Two buttons each side counter->setIncSteps(QwtCounter::Button1, 1); // Button 1 increments 1 step counter->setIncSteps(QwtCounter::Button2, 20); // Button 2 increments 20 steps connect(counter, SIGNAL(valueChanged(double)), myClass, SLOT(newValue(double))); Definition at line 48 of file qwt_counter.h. Member Enumeration Documentation enum QwtCounter::Button Button index. Enumerator Button1 Button intended for minor steps. Button2 Button intended for medium steps. Button3 Button intended for large steps. ButtonCnt Number of buttons. Definition at line 67 of file qwt_counter.h. Constructor & Destructor Documentation QwtCounter::QwtCounter (QWidget * parent = NULL) [explicit] The counter is initialized with a range is set to [0.0, 1.0] with 0.01 as single step size. The value is invalid. The default number of buttons is set to 2. The default increments are: o Button 1: 1 step o Button 2: 10 steps o Button 3: 100 steps Parameters parent Definition at line 65 of file qwt_counter.cpp. Member Function Documentation void QwtCounter::buttonReleased (double value) [signal] This signal is emitted when a button has been released Parameters value The new value bool QwtCounter::event (QEvent * event) [override], [protected], [virtual] Handle QEvent::PolishRequest events Parameters event Event Returns see QWidget::event() Definition at line 485 of file qwt_counter.cpp. int QwtCounter::incSteps (QwtCounter::Button button) const Returns The number of steps by which a specified button increments the value or 0 if the button is invalid. Parameters button Button index See also setIncSteps() Definition at line 416 of file qwt_counter.cpp. bool QwtCounter::isReadOnly () const Returns True, when the line line edit is read only. (default is no) See also setReadOnly() Definition at line 186 of file qwt_counter.cpp. bool QwtCounter::isValid () const Returns True, if the value is valid See also setValid(), setValue() Definition at line 166 of file qwt_counter.cpp. void QwtCounter::keyPressEvent (QKeyEvent * event) [override], [protected], [virtual] Handle key events o Ctrl + Qt::Key_Home Step to minimum() o Ctrl + Qt::Key_End Step to maximum() o Qt::Key_Up Increment by incSteps(QwtCounter::Button1) o Qt::Key_Down Decrement by incSteps(QwtCounter::Button1) o Qt::Key_PageUp Increment by incSteps(QwtCounter::Button2) o Qt::Key_PageDown Decrement by incSteps(QwtCounter::Button2) o Shift + Qt::Key_PageUp Increment by incSteps(QwtCounter::Button3) o Shift + Qt::Key_PageDown Decrement by incSteps(QwtCounter::Button3) Parameters event Key event Definition at line 524 of file qwt_counter.cpp. double QwtCounter::maximum () const Returns The maximum of the range See also setRange(), setMaximum(), minimum() Definition at line 306 of file qwt_counter.cpp. double QwtCounter::minimum () const Returns The minimum of the range See also setRange(), setMinimum(), maximum() Definition at line 286 of file qwt_counter.cpp. int QwtCounter::numButtons () const Returns The number of buttons on each side of the widget. See also setNumButtons() Definition at line 388 of file qwt_counter.cpp. void QwtCounter::setIncSteps (QwtCounter::Button button, int numSteps) Specify the number of steps by which the value is incremented or decremented when a specified button is pushed. Parameters button Button index numSteps Number of steps See also incSteps() Definition at line 403 of file qwt_counter.cpp. void QwtCounter::setMaximum (double value) Set the maximum value of the range Parameters value Maximum value See also setRange(), setMinimum(), maximum() Definition at line 297 of file qwt_counter.cpp. void QwtCounter::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 277 of file qwt_counter.cpp. void QwtCounter::setNumButtons (int numButtons) Specify the number of buttons on each side of the label Parameters numButtons Number of buttons See also numButtons() Definition at line 362 of file qwt_counter.cpp. void QwtCounter::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 241 of file qwt_counter.cpp. void QwtCounter::setReadOnly (bool on) Allow/disallow the user to manually edit the value. Parameters on True disable editing See also isReadOnly() Definition at line 177 of file qwt_counter.cpp. void QwtCounter::setSingleStep (double stepSize) Set the step size of the counter. A value <= 0.0 disables stepping Parameters stepSize Single step size See also singleStep() Definition at line 319 of file qwt_counter.cpp. void QwtCounter::setStepButton1 (int nSteps) Set the number of increment steps for button 1 Parameters nSteps Number of steps Definition at line 429 of file qwt_counter.cpp. void QwtCounter::setStepButton2 (int nSteps) Set the number of increment steps for button 2 Parameters nSteps Number of steps Definition at line 444 of file qwt_counter.cpp. void QwtCounter::setStepButton3 (int nSteps) Set the number of increment steps for button 3 Parameters nSteps Number of steps Definition at line 459 of file qwt_counter.cpp. void QwtCounter::setValid (bool on) Set the counter to be in valid/invalid state When the counter is set to invalid, no numbers are displayed and the buttons are disabled. Parameters on If true the counter will be set as valid See also setValue(), isValid() Definition at line 142 of file qwt_counter.cpp. void QwtCounter::setValue (double value) [slot] Set a new value without adjusting to the step raster. The state of the counter is set to be valid. Parameters value New value See also isValid(), value(), valueChanged() Warning The value is clipped when it lies outside the range. Definition at line 202 of file qwt_counter.cpp. void QwtCounter::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 342 of file qwt_counter.cpp. double QwtCounter::singleStep () const Returns Single step size See also setSingleStep() Definition at line 328 of file qwt_counter.cpp. double QwtCounter::value () const Returns Current value of the counter See also setValue(), valueChanged() Definition at line 225 of file qwt_counter.cpp. void QwtCounter::valueChanged (double value) [signal] This signal is emitted when the counter's value has changed Parameters value The new value void QwtCounter::wheelEvent (QWheelEvent * event) [override], [protected], [virtual] Handle wheel events Parameters event Wheel event Definition at line 591 of file qwt_counter.cpp. bool QwtCounter::wrapping () const Returns True, when wrapping is set See also setWrapping() Definition at line 351 of file qwt_counter.cpp. Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.2.0 Sun Jul 18 2021 QwtCounter(3)