This class is useful as a base class or a member for sliders. It represents an interval of type double within which a value can be moved. The value can be either an arbitrary point inside the interval (see QwtDblRange::setValue), or it can be fitted into a step raster (see QwtDblRange::fitValue and QwtDblRange::incValue).
As a special case, a QwtDblRange can be periodic, which means that a value outside the interval will be mapped to a value inside the interval when QwtDblRange::setValue(), QwtDblRange::fitValue(), QwtDblRange::incValue() or QwtDblRange::incPages() are called.
Definition at line 31 of file qwt_drange.h.
Public Member Functions | |
QwtDblRange () | |
virtual | ~QwtDblRange () |
void | setRange (double vmin, double vmax, double vstep=0.0, int pagesize=1) |
void | setValid (bool) |
bool | isValid () const |
virtual void | setValue (double) |
double | value () const |
void | setPeriodic (bool tf) |
bool | periodic () const |
void | setStep (double) |
double | step () const |
double | maxValue () const |
double | minValue () const |
int | pageSize () const |
virtual void | incValue (int) |
virtual void | incPages (int) |
virtual void | fitValue (double) |
Protected Member Functions | |
double | exactValue () const |
double | exactPrevValue () const |
double | prevValue () const |
virtual void | valueChange () |
virtual void | stepChange () |
virtual void | rangeChange () |
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The range is initialized to [0.0, 100.0], the step size to 1.0, and the value to 0.0. Definition at line 21 of file qwt_drange.cpp. |
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Destroys the QwtDblRange.
Definition at line 36 of file qwt_drange.cpp. |
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Returns the exact previous value.
Definition at line 380 of file qwt_drange.cpp. Referenced by QwtSliderBase::mouseMoveEvent(). |
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Returns the exact value. The exact value is the value which QwtDblRange::value would return if the value were not adjusted to the step raster. It differs from the current value only if QwtDblRange::fitValue or QwtDblRange::incValue have been used before. This function is intended for internal use in derived classes. Definition at line 374 of file qwt_drange.cpp. Referenced by QwtSliderBase::mouseMoveEvent(), and QwtSliderBase::timerEvent(). |
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Adjust the value to the closest point in the step raster.
Reimplemented in QwtSliderBase. Definition at line 132 of file qwt_drange.cpp. Referenced by QwtSliderBase::fitValue(), QwtSliderBase::mouseReleaseEvent(), QwtSliderBase::setPosition(), and QwtSliderBase::timerEvent(). |
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Increment the value by a specified number of pages.
Definition at line 271 of file qwt_drange.cpp. References isValid(). Referenced by QwtSliderBase::mouseReleaseEvent(), QwtSliderBase::timerEvent(), and QwtSliderBase::wheelEvent(). |
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Increment the value by a specified number of steps.
Reimplemented in QwtSliderBase. Definition at line 259 of file qwt_drange.cpp. References isValid(). Referenced by QwtSliderBase::incValue(), QwtSliderBase::keyPressEvent(), and QwtDial::keyPressEvent(). |
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Indicates if the value is valid.
Reimplemented in QwtSliderBase. Definition at line 51 of file qwt_drange.cpp. Referenced by incPages(), incValue(), and QwtSliderBase::isValid(). |
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Returns the value of the second border of the range. maxValue returns the value which has been specified as the second parameter in QwtDblRange::setRange.
Definition at line 326 of file qwt_drange.cpp. Referenced by QwtDial::drawContents(), QwtWheel::drawWheel(), QwtWheel::getValue(), QwtSlider::getValue(), QwtDial::getValue(), QwtDial::keyPressEvent(), QwtCounter::maxVal(), QwtSlider::rangeChange(), QwtSlider::scaleChange(), QwtCounter::setMinValue(), QwtDial::updateScale(), and QwtSlider::xyPosition(). |
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Returns the value at the first border of the range. minValue returns the value which has been specified as the first parameter in setRange().
Definition at line 339 of file qwt_drange.cpp. Referenced by QwtDial::drawContents(), QwtWheel::drawWheel(), QwtWheel::getValue(), QwtSlider::getValue(), QwtDial::getValue(), QwtDial::keyPressEvent(), QwtCounter::minVal(), QwtSlider::rangeChange(), QwtSlider::scaleChange(), QwtCounter::setMaxValue(), QwtDial::updateScale(), and QwtSlider::xyPosition(). |
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Returns the page size in steps.
Definition at line 354 of file qwt_drange.cpp. Referenced by QwtDial::keyPressEvent(). |
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Returns TRUE if the range is periodic.
Definition at line 348 of file qwt_drange.cpp. Referenced by QwtDial::wrapping(). |
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Returns the previous value.
Definition at line 386 of file qwt_drange.cpp. Referenced by QwtSliderBase::keyPressEvent(), QwtDial::keyPressEvent(), QwtSliderBase::mouseMoveEvent(), and QwtSliderBase::wheelEvent(). |
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Notify a change of the range. This virtual function is called whenever the range changes. The default implementation does nothing. Reimplemented in QwtCounter, QwtDial, and QwtSlider. Definition at line 294 of file qwt_drange.cpp. Referenced by QwtSlider::rangeChange(), and setRange(). |
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Make the range periodic. When the range is periodic, the value will be set to a point inside the interval such that
point = value + n * width if the user tries to set a new value which is outside the range. If the range is nonperiodic (the default), values outside the range will be clipped.
Definition at line 248 of file qwt_drange.cpp. Referenced by QwtDial::setWrapping(). |
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Specify range and step size.
Definition at line 169 of file qwt_drange.cpp. References qwtLim(), rangeChange(), and setStep(). Referenced by QwtAnalogClock::QwtAnalogClock(), QwtCounter::QwtCounter(), QwtDial::QwtDial(), QwtSliderBase::QwtSliderBase(), QwtCounter::setMaxValue(), and QwtCounter::setMinValue(). |
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Change the step raster.
Reimplemented in QwtCounter. Definition at line 208 of file qwt_drange.cpp. References stepChange(). Referenced by setRange(), and QwtCounter::setStep(). |
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Set the value to be valid/invalid.
Reimplemented in QwtSliderBase. Definition at line 41 of file qwt_drange.cpp. References valueChange(). Referenced by QwtSliderBase::setValid(). |
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Set a new value without adjusting to the step raster.
Reimplemented in QwtCounter, and QwtSliderBase. Definition at line 147 of file qwt_drange.cpp. Referenced by QwtSliderBase::setValue(), and QwtCounter::setValue(). |
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Reimplemented in QwtCounter. Definition at line 313 of file qwt_drange.cpp. Referenced by QwtSliderBase::mouseReleaseEvent(), QwtCounter::setMaxValue(), QwtCounter::setMinValue(), QwtCounter::step(), and QwtSliderBase::timerEvent(). |
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Notify a change of the step size. This virtual function is called whenever the step size changes. The default implementation does nothing. Definition at line 305 of file qwt_drange.cpp. Referenced by setStep(). |
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Returns the current value.
Reimplemented in QwtCounter. Definition at line 360 of file qwt_drange.cpp. Referenced by QwtDial::drawContents(), QwtAnalogClock::drawNeedle(), QwtCompass::drawScaleContents(), QwtSlider::drawSlider(), QwtWheel::drawWheel(), QwtSlider::getScrollMode(), QwtDial::getValue(), QwtSliderBase::keyPressEvent(), QwtDial::keyPressEvent(), QwtCompass::keyPressEvent(), QwtSliderBase::mouseMoveEvent(), QwtSliderBase::mousePressEvent(), QwtSliderBase::mouseReleaseEvent(), QwtSliderBase::timerEvent(), QwtCounter::value(), QwtSliderBase::valueChange(), and QwtSliderBase::wheelEvent(). |
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Notify a change of value. This virtual function is called whenever the value changes. The default implementation does nothing. Reimplemented in QwtDial, QwtSliderBase, QwtSlider, and QwtWheel. Definition at line 283 of file qwt_drange.cpp. Referenced by setValid(). |