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examples/oscilloscope/WheelBox.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "WheelBox.h"
+
+#include <QwtWheel>
+#include <QLabel>
+#include <QLCDNumber>
+#include <QLayout>
+#include <QWheelEvent>
+#include <QApplication>
+
+namespace
+{
+    class Wheel : public QwtWheel
+    {
+      public:
+        Wheel( QWidget* parent )
+            : QwtWheel( parent )
+            , m_ignoreWheelEvent( false )
+        {
+            setFocusPolicy( Qt::WheelFocus );
+            parent->installEventFilter( this );
+        }
+
+        virtual bool eventFilter( QObject* object, QEvent* event ) QWT_OVERRIDE
+        {
+            if ( event->type() == QEvent::Wheel && !m_ignoreWheelEvent )
+            {
+                const QWheelEvent* we = static_cast< QWheelEvent* >( event );
+
+                const QPoint pos = wheelRect().center();
+
+#if QT_VERSION >= 0x050c00
+                QWheelEvent wheelEvent(
+                    pos, mapToGlobal( pos ),
+                    we->pixelDelta(), we->angleDelta(),
+                    we->buttons(), we->modifiers(),
+                    we->phase(), we->inverted() );
+#else
+                QWheelEvent wheelEvent(
+                    pos, we->delta(),
+                    we->buttons(), we->modifiers(),
+                    we->orientation() );
+#endif
+
+                m_ignoreWheelEvent = true;
+                QApplication::sendEvent( this, &wheelEvent );
+                m_ignoreWheelEvent = false;
+
+                return true;
+            }
+
+            return QwtWheel::eventFilter( object, event );
+        }
+      private:
+        bool m_ignoreWheelEvent;
+    };
+}
+
+WheelBox::WheelBox( const QString& title,
+        double min, double max, double stepSize, QWidget* parent )
+    : QWidget( parent )
+{
+    m_number = new QLCDNumber();
+    m_number->setSegmentStyle( QLCDNumber::Filled );
+    m_number->setAutoFillBackground( true );
+    m_number->setFixedHeight( m_number->sizeHint().height() * 2 );
+    m_number->setFocusPolicy( Qt::WheelFocus );
+
+    QPalette pal( Qt::black );
+    pal.setColor( QPalette::WindowText, Qt::green );
+    m_number->setPalette( pal );
+
+    m_wheel = new Wheel( this );
+    m_wheel->setOrientation( Qt::Vertical );
+    m_wheel->setInverted( true );
+    m_wheel->setRange( min, max );
+    m_wheel->setSingleStep( stepSize );
+    m_wheel->setPageStepCount( 5 );
+    m_wheel->setFixedHeight( m_number->height() );
+
+    m_number->setFocusProxy( m_wheel );
+
+    QFont font( "Helvetica", 10 );
+    font.setBold( true );
+
+    m_label = new QLabel( title );
+    m_label->setFont( font );
+
+    QHBoxLayout* hLayout = new QHBoxLayout;
+    hLayout->setContentsMargins( 0, 0, 0, 0 );
+    hLayout->setSpacing( 2 );
+    hLayout->addWidget( m_number, 10 );
+    hLayout->addWidget( m_wheel );
+
+    QVBoxLayout* vLayout = new QVBoxLayout( this );
+    vLayout->addLayout( hLayout, 10 );
+    vLayout->addWidget( m_label, 0, Qt::AlignTop | Qt::AlignHCenter );
+
+    connect( m_wheel, SIGNAL(valueChanged(double)),
+        m_number, SLOT(display(double)) );
+
+    connect( m_wheel, SIGNAL(valueChanged(double)),
+        this, SIGNAL(valueChanged(double)) );
+}
+
+void WheelBox::setTheme( const QColor& color )
+{
+    m_wheel->setPalette( color );
+}
+
+QColor WheelBox::theme() const
+{
+    return m_wheel->palette().color( QPalette::Window );
+}
+
+void WheelBox::setValue( double value )
+{
+    m_wheel->setValue( value );
+    m_number->display( value );
+}
+
+double WheelBox::value() const
+{
+    return m_wheel->value();
+}
+
+#include "moc_WheelBox.cpp"