QwtCounter Class Reference
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 |
| virtual void | polish () |
| double | step () const |
| void | setStep (double s) |
| double | minVal () const |
| void | setMinValue (double m) |
| double | maxVal () 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 () |
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. 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)));
Member Enumeration Documentation
| enum QwtCounter::Button |
Button index
Constructor & Destructor Documentation
| QwtCounter::QwtCounter | ( | QWidget * | parent = NULL |
) | [explicit] |
The default number of buttons is set to 2. The default increments are:
- Button 1: 1 step
- Button 2: 10 steps
- Button 3: 100 steps
- Parameters:
-
parent
| QwtCounter::~QwtCounter | ( | ) | [virtual] |
Destructor.
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::editable | ( | ) | const |
returns whether the line edit is edatble. (default is yes)
| bool QwtCounter::event | ( | QEvent * | e | ) | [protected, virtual] |
Handle PolishRequest events
| int QwtCounter::incSteps | ( | QwtCounter::Button | btn | ) | const |
- Returns:
- the number of steps by which a specified button increments the value or 0 if the button is invalid.
- Parameters:
-
btn One of QwtCounter::Button1,QwtCounter::Button2,QwtCounter::Button3
| void QwtCounter::keyPressEvent | ( | QKeyEvent * | e | ) | [protected, virtual] |
Handle key events
- Ctrl + Qt::Key_Home Step to minValue()
- Ctrl + Qt::Key_End Step to maxValue()
- Qt::Key_Up Increment by incSteps(QwtCounter::Button1)
- Qt::Key_Down Decrement by incSteps(QwtCounter::Button1)
- Qt::Key_PageUp Increment by incSteps(QwtCounter::Button2)
- Qt::Key_PageDown Decrement by incSteps(QwtCounter::Button2)
- Shift + Qt::Key_PageUp Increment by incSteps(QwtCounter::Button3)
- Shift + Qt::Key_PageDown Decrement by incSteps(QwtCounter::Button3)
| double QwtCounter::maxVal | ( | ) | const |
returns the maximum value of the range
| double QwtCounter::minVal | ( | ) | const |
returns the minimum value of the range
| int QwtCounter::numButtons | ( | ) | const |
- Returns:
- The number of buttons on each side of the widget.
| void QwtCounter::polish | ( | ) | [virtual] |
Sets the minimum width for the buttons
| 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.
- Parameters:
-
editable true enables editing
- See also:
- editable()
| 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.
- Parameters:
-
btn One of QwtCounter::Button1,QwtCounter::Button2,QwtCounter::Button3nSteps 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.
- Parameters:
-
n Number of buttons
| void QwtCounter::setStep | ( | double | stepSize | ) |
Set the step size
- Parameters:
-
stepSize Step size
- See also:
- QwtDoubleRange::setStep()
Reimplemented from QwtDoubleRange.
| void QwtCounter::setStepButton1 | ( | int | nSteps | ) |
Set the number of increment steps for button 1
- Parameters:
-
nSteps Number of steps
| void QwtCounter::setStepButton2 | ( | int | nSteps | ) |
Set the number of increment steps for button 2
- Parameters:
-
nSteps Number of steps
| void QwtCounter::setStepButton3 | ( | int | nSteps | ) |
Set the number of increment steps for button 3
- Parameters:
-
nSteps Number of steps
| void QwtCounter::setValue | ( | double | v | ) | [virtual] |
Set a new value.
- Parameters:
-
v new value Calls QwtDoubleRange::setValue and does all visual updates.
- See also:
- QwtDoubleRange::setValue()
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] |
- Returns:
- Current value
Reimplemented from QwtDoubleRange.
| 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 * | e | ) | [protected, virtual] |
Handle wheel events
- Parameters:
-
e Wheel event
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