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#include <math.h>
#include <qapplication.h>
#include <qlabel.h>
#include <qlayout.h>
#include <qwt_slider.h>
#include <qwt_scale_engine.h>
#include <qwt_scale_map.h>
#include "sliders.h"
class Layout: public QBoxLayout
{
public:
Layout(Qt::Orientation o, QWidget *parent = NULL):
#if QT_VERSION < 0x040000
QBoxLayout(parent, QBoxLayout::LeftToRight)
#else
QBoxLayout(QBoxLayout::LeftToRight, parent)
#endif
{
if ( o == Qt::Vertical )
setDirection(QBoxLayout::TopToBottom);
setSpacing(20);
setMargin(0);
}
};
Slider::Slider(QWidget *parent, int sliderType):
QWidget(parent)
{
d_slider = createSlider(this, sliderType);
#if QT_VERSION < 0x040000
int alignment = Qt::AlignCenter;
#else
QFlags<Qt::AlignmentFlag> alignment;
#endif
switch(d_slider->scalePosition())
{
case QwtSlider::NoScale:
if ( d_slider->orientation() == Qt::Horizontal )
alignment = Qt::AlignHCenter | Qt::AlignTop;
else
alignment = Qt::AlignVCenter | Qt::AlignLeft;
break;
case QwtSlider::LeftScale:
alignment = Qt::AlignVCenter | Qt::AlignRight;
break;
case QwtSlider::RightScale:
alignment = Qt::AlignVCenter | Qt::AlignLeft;
break;
case QwtSlider::TopScale:
alignment = Qt::AlignHCenter | Qt::AlignBottom;
break;
case QwtSlider::BottomScale:
alignment = Qt::AlignHCenter | Qt::AlignTop;
break;
}
d_label = new QLabel("0", this);
d_label->setAlignment(alignment);
d_label->setFixedWidth(d_label->fontMetrics().width("10000.9"));
connect(d_slider, SIGNAL(valueChanged(double)), SLOT(setNum(double)));
QBoxLayout *layout;
if ( d_slider->orientation() == Qt::Horizontal )
layout = new QHBoxLayout(this);
else
layout = new QVBoxLayout(this);
layout->addWidget(d_slider);
layout->addWidget(d_label);
}
QwtSlider *Slider::createSlider(QWidget *parent, int sliderType) const
{
QwtSlider *slider = NULL;
switch(sliderType)
{
case 0:
{
slider = new QwtSlider(parent,
Qt::Horizontal, QwtSlider::TopScale, QwtSlider::BgTrough);
slider->setThumbWidth(10);
slider->setRange(-10.0, 10.0, 1.0, 0); // paging disabled
break;
}
case 1:
{
slider = new QwtSlider(parent,
Qt::Horizontal, QwtSlider::NoScale, QwtSlider::BgBoth);
slider->setRange(0.0, 1.0, 0.01, 5);
break;
}
case 2:
{
slider = new QwtSlider(parent,
Qt::Horizontal, QwtSlider::BottomScale, QwtSlider::BgSlot);
slider->setThumbWidth(25);
slider->setThumbLength(12);
slider->setRange(1000.0, 3000.0, 10.0, 10);
break;
}
case 3:
{
slider = new QwtSlider(parent,
Qt::Vertical, QwtSlider::LeftScale, QwtSlider::BgSlot);
slider->setRange(0.0, 100.0, 1.0, 5);
slider->setScaleMaxMinor(5);
break;
}
case 4:
{
slider = new QwtSlider(parent,
Qt::Vertical, QwtSlider::NoScale, QwtSlider::BgTrough);
slider->setRange(0.0,100.0,1.0, 10);
break;
}
case 5:
{
slider = new QwtSlider(parent,
Qt::Vertical, QwtSlider::RightScale, QwtSlider::BgBoth);
slider->setScaleEngine(new QwtLog10ScaleEngine);
slider->setThumbWidth(20);
slider->setBorderWidth(1);
slider->setRange(0.0, 4.0, 0.01);
slider->setScale(1.0, 1.0e4);
slider->setScaleMaxMinor(10);
break;
}
}
return slider;
}
void Slider::setNum(double v)
{
if ( d_slider->scaleMap().transformation()->type() ==
QwtScaleTransformation::Log10 )
{
v = pow(10.0, v);
}
QString text;
text.setNum(v, 'f', 1);
d_label->setText(text);
}
SliderDemo::SliderDemo(QWidget *p):
QWidget(p)
{
int i;
Layout *hSliderLayout = new Layout(Qt::Vertical);
for ( i = 0; i < 3; i++ )
hSliderLayout->addWidget(new Slider(this, i));
hSliderLayout->addStretch();
Layout *vSliderLayout = new Layout(Qt::Horizontal);
for ( ; i < 6; i++ )
vSliderLayout->addWidget(new Slider(this, i));
QLabel *vTitle = new QLabel("Vertical Sliders", this);
vTitle->setFont(QFont("Helvetica", 14, QFont::Bold));
vTitle->setAlignment(Qt::AlignHCenter);
Layout *layout1 = new Layout(Qt::Vertical);
layout1->addWidget(vTitle, 0);
layout1->addLayout(vSliderLayout, 10);
QLabel *hTitle = new QLabel("Horizontal Sliders", this);
hTitle->setFont(vTitle->font());
hTitle->setAlignment(Qt::AlignHCenter);
Layout *layout2 = new Layout(Qt::Vertical);
layout2->addWidget(hTitle, 0);
layout2->addLayout(hSliderLayout, 10);
Layout *mainLayout = new Layout(Qt::Horizontal, this);
mainLayout->addLayout(layout1);
mainLayout->addLayout(layout2, 10);
}
int main (int argc, char **argv)
{
QApplication a(argc, argv);
QApplication::setFont(QFont("Helvetica",10));
SliderDemo w;
#if QT_VERSION < 0x040000
a.setMainWidget(&w);
#endif
w.show();
return a.exec();
}
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