Qwt User's Guide 6.0.0
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The Counter Widget. More...
#include <qwt_counter.h>
Public Types | |
enum | Button { Button1, Button2, Button3, ButtonCnt } |
Signals | |
void | buttonReleased (double value) |
void | valueChanged (double value) |
Public Member Functions | |
QwtCounter (QWidget *parent=NULL) | |
virtual | ~QwtCounter () |
bool | editable () const |
void | setEditable (bool) |
void | setNumButtons (int n) |
int | numButtons () const |
void | setIncSteps (QwtCounter::Button btn, int nSteps) |
int | incSteps (QwtCounter::Button btn) const |
virtual void | setValue (double) |
virtual QSize | sizeHint () const |
double | step () const |
void | setStep (double s) |
double | minValue () const |
void | setMinValue (double m) |
double | maxValue () const |
void | setMaxValue (double m) |
void | setStepButton1 (int nSteps) |
int | stepButton1 () const |
void | setStepButton2 (int nSteps) |
int | stepButton2 () const |
void | setStepButton3 (int nSteps) |
int | stepButton3 () const |
virtual double | value () const |
Protected Member Functions | |
virtual bool | event (QEvent *) |
virtual void | wheelEvent (QWheelEvent *) |
virtual void | keyPressEvent (QKeyEvent *) |
virtual void | rangeChange () |
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. The range can be specified using QwtDblRange::setRange(). The counter's value is an integer multiple of the step size. The number of steps by which a button increments or decrements the value can be specified using QwtCounter::setIncSteps(). The number of buttons can be changed with QwtCounter::setNumButtons().
Holding the space bar down with focus on a button is the fastest method to step through the counter values. When the counter underflows/overflows, the focus is set to the smallest up/down button and counting is disabled. Counting is re-enabled on a button release event (mouse or space bar).
Example:
#include "../include/qwt_counter.h> QwtCounter *cnt; cnt = new QwtCounter(parent, name); cnt->setRange(0.0, 100.0, 1.0); // From 0.0 to 100, step 1.0 cnt->setNumButtons(2); // Two buttons each side cnt->setIncSteps(QwtCounter::Button1, 1); // Button 1 increments 1 step cnt->setIncSteps(QwtCounter::Button2, 20); // Button 2 increments 20 steps connect(cnt, SIGNAL(valueChanged(double)), my_class, SLOT(newValue(double)));
enum QwtCounter::Button |
QwtCounter::QwtCounter | ( | QWidget * | parent = NULL | ) | [explicit] |
The default number of buttons is set to 2. The default increments are:
parent |
QwtCounter::~QwtCounter | ( | ) | [virtual] |
Destructor.
void QwtCounter::buttonReleased | ( | double | value | ) | [signal] |
This signal is emitted when a button has been released
value | The new value |
bool QwtCounter::editable | ( | ) | const |
returns whether the line edit is edatble. (default is yes)
bool QwtCounter::event | ( | QEvent * | event | ) | [protected, virtual] |
Handle PolishRequest events
event | Event |
int QwtCounter::incSteps | ( | QwtCounter::Button | button | ) | const |
button | Button index |
void QwtCounter::keyPressEvent | ( | QKeyEvent * | event | ) | [protected, virtual] |
Handle key events
event | Key event |
double QwtCounter::maxValue | ( | ) | const |
returns the maximum value of the range
Reimplemented from QwtDoubleRange.
double QwtCounter::minValue | ( | ) | const |
returns the minimum value of the range
Reimplemented from QwtDoubleRange.
int QwtCounter::numButtons | ( | ) | const |
void QwtCounter::rangeChange | ( | ) | [protected, virtual] |
Notify change of range.
This function updates the enabled property of all buttons contained in QwtCounter.
Reimplemented from QwtDoubleRange.
void QwtCounter::setEditable | ( | bool | editable | ) |
Allow/disallow the user to manually edit the value.
editable | true enables editing |
void QwtCounter::setIncSteps | ( | QwtCounter::Button | button, |
int | nSteps | ||
) |
Specify the number of steps by which the value is incremented or decremented when a specified button is pushed.
button | Button index |
nSteps | Number of steps |
void QwtCounter::setMaxValue | ( | double | value | ) |
void QwtCounter::setMinValue | ( | double | value | ) |
Set the minimum value of the range
value | Minimum value |
void QwtCounter::setNumButtons | ( | int | numButtons | ) |
Specify the number of buttons on each side of the label.
numButtons | Number of buttons |
void QwtCounter::setStep | ( | double | stepSize | ) |
Set the step size
stepSize | Step size |
Reimplemented from QwtDoubleRange.
void QwtCounter::setStepButton1 | ( | int | nSteps | ) |
Set the number of increment steps for button 1
nSteps | Number of steps |
void QwtCounter::setStepButton2 | ( | int | nSteps | ) |
Set the number of increment steps for button 2
nSteps | Number of steps |
void QwtCounter::setStepButton3 | ( | int | nSteps | ) |
Set the number of increment steps for button 3
nSteps | Number of steps |
void QwtCounter::setValue | ( | double | value | ) | [virtual] |
Set a new value.
Calls QwtDoubleRange::setValue and does all visual updates.
value | New value |
Reimplemented from QwtDoubleRange.
QSize QwtCounter::sizeHint | ( | ) | const [virtual] |
A size hint.
double QwtCounter::step | ( | ) | const |
returns the step size
Reimplemented from QwtDoubleRange.
int QwtCounter::stepButton1 | ( | ) | const |
returns the number of increment steps for button 1
int QwtCounter::stepButton2 | ( | ) | const |
returns the number of increment steps for button 2
int QwtCounter::stepButton3 | ( | ) | const |
returns the number of increment steps for button 3
double QwtCounter::value | ( | ) | const [virtual] |
Reimplemented from QwtDoubleRange.
void QwtCounter::valueChanged | ( | double | value | ) | [signal] |
This signal is emitted when the counter's value has changed
value | The new value |
void QwtCounter::wheelEvent | ( | QWheelEvent * | event | ) | [protected, virtual] |
Handle wheel events
event | Wheel event |