Qwt User's Guide
5.2.3
|
#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 |
int | incSteps (QwtCounter::Button btn) const |
double | maxVal () const |
double | minVal () const |
int | numButtons () const |
virtual void | polish () |
void | setEditable (bool) |
void | setIncSteps (QwtCounter::Button btn, int nSteps) |
void | setMaxValue (double m) |
void | setMinValue (double m) |
void | setNumButtons (int n) |
void | setStep (double s) |
void | setStepButton1 (int nSteps) |
void | setStepButton2 (int nSteps) |
void | setStepButton3 (int nSteps) |
virtual void | setValue (double) |
virtual QSize | sizeHint () const |
double | step () const |
int | stepButton1 () const |
int | stepButton2 () const |
int | stepButton3 () const |
virtual double | value () const |
![]() | |
QwtDoubleRange () | |
virtual | ~QwtDoubleRange () |
virtual void | fitValue (double) |
virtual void | incPages (int) |
virtual void | incValue (int) |
bool | isValid () const |
double | maxValue () const |
double | minValue () const |
int | pageSize () const |
bool | periodic () const |
void | setPeriodic (bool tf) |
void | setRange (double vmin, double vmax, double vstep=0.0, int pagesize=1) |
void | setValid (bool) |
Protected Member Functions | |
virtual bool | event (QEvent *) |
virtual void | keyPressEvent (QKeyEvent *) |
virtual void | rangeChange () |
virtual void | wheelEvent (QWheelEvent *) |
![]() | |
double | exactPrevValue () const |
double | exactValue () const |
double | prevValue () const |
virtual void | stepChange () |
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:
enum QwtCounter::Button |
Button index
|
explicit |
The default number of buttons is set to 2. The default increments are:
parent |
|
signal |
This signal is emitted when a button has been released
value | The new value |
|
protectedvirtual |
Handle PolishRequest events
int QwtCounter::incSteps | ( | QwtCounter::Button | btn | ) | const |
btn | One of QwtCounter::Button1 , QwtCounter::Button2 , QwtCounter::Button3 |
|
protectedvirtual |
Handle key events
int QwtCounter::numButtons | ( | ) | const |
|
virtual |
Sets the minimum width for the buttons
|
protectedvirtual |
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 | btn, |
int | nSteps | ||
) |
Specify the number of steps by which the value is incremented or decremented when a specified button is pushed.
btn | One of QwtCounter::Button1 , QwtCounter::Button2 , QwtCounter::Button3 |
nSteps | Number of steps |
void QwtCounter::setMaxValue | ( | double | value | ) |
void QwtCounter::setMinValue | ( | double | value | ) |
void QwtCounter::setNumButtons | ( | int | n | ) |
Specify the number of buttons on each side of the label.
n | 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 |
|
virtual |
Set a new value.
v | new value Calls QwtDoubleRange::setValue and does all visual updates. |
Reimplemented from QwtDoubleRange.
|
virtual |
Reimplemented from QwtDoubleRange.
|
signal |
This signal is emitted when the counter's value has changed
value | The new value |
|
protectedvirtual |
Handle wheel events
e | Wheel event |