新增qwt源码版本

qwtdemo/examples/oscilloscope/wheelbox.cpp

@@ -0,0 +1,102 @@
+#include "wheelbox.h"
+#include <qwt_wheel.h>
+#include <qlcdnumber.h>
+#include <qlabel.h>
+#include <qlayout.h>
+#include <qevent.h>
+#include <qapplication.h>
+
+class Wheel: public QwtWheel
+{
+public:
+    Wheel( WheelBox *parent ):
+        QwtWheel( parent )
+    {
+        setFocusPolicy( Qt::WheelFocus );
+        parent->installEventFilter( this );
+    }
+
+    virtual bool eventFilter( QObject *object, QEvent *event )
+    {
+        if ( event->type() == QEvent::Wheel )
+        {
+            const QWheelEvent *we = static_cast<QWheelEvent *>( event );
+
+            QWheelEvent wheelEvent( QPoint( 5, 5 ), we->delta(),
+                we->buttons(), we->modifiers(),
+                we->orientation() );
+
+            QApplication::sendEvent( this, &wheelEvent );
+            return true;
+        }
+        return QwtWheel::eventFilter( object, event );
+    }
+};
+
+WheelBox::WheelBox( const QString &title,
+        double min, double max, double stepSize, QWidget *parent ):
+    QWidget( parent )
+{
+
+    d_number = new QLCDNumber( this );
+    d_number->setSegmentStyle( QLCDNumber::Filled );
+    d_number->setAutoFillBackground( true );
+    d_number->setFixedHeight( d_number->sizeHint().height() * 2 );
+    d_number->setFocusPolicy( Qt::WheelFocus );
+
+    QPalette pal( Qt::black );
+    pal.setColor( QPalette::WindowText, Qt::green );
+    d_number->setPalette( pal );
+
+    d_wheel = new Wheel( this );
+    d_wheel->setOrientation( Qt::Vertical );
+    d_wheel->setInverted( true );
+    d_wheel->setRange( min, max );
+    d_wheel->setSingleStep( stepSize );
+    d_wheel->setPageStepCount( 5 );
+    d_wheel->setFixedHeight( d_number->height() );
+
+    d_number->setFocusProxy( d_wheel );
+
+    QFont font( "Helvetica", 10 );
+    font.setBold( true );
+
+    d_label = new QLabel( title, this );
+    d_label->setFont( font );
+
+    QHBoxLayout *hLayout = new QHBoxLayout;
+    hLayout->setContentsMargins( 0, 0, 0, 0 );
+    hLayout->setSpacing( 2 );
+    hLayout->addWidget( d_number, 10 );
+    hLayout->addWidget( d_wheel );
+
+    QVBoxLayout *vLayout = new QVBoxLayout( this );
+    vLayout->addLayout( hLayout, 10 );
+    vLayout->addWidget( d_label, 0, Qt::AlignTop | Qt::AlignHCenter );
+
+    connect( d_wheel, SIGNAL( valueChanged( double ) ),
+        d_number, SLOT( display( double ) ) );
+    connect( d_wheel, SIGNAL( valueChanged( double ) ),
+        this, SIGNAL( valueChanged( double ) ) );
+}
+
+void WheelBox::setTheme( const QColor &color )
+{
+    d_wheel->setPalette( color );
+}
+
+QColor WheelBox::theme() const
+{
+    return d_wheel->palette().color( QPalette::Window );
+}
+
+void WheelBox::setValue( double value )
+{
+    d_wheel->setValue( value );
+    d_number->display( value );
+}
+
+double WheelBox::value() const
+{
+    return d_wheel->value();
+}