diff options
Diffstat (limited to 'src/libpcp_qwt/src/qwt_magnifier.cpp')
| -rw-r--r-- | src/libpcp_qwt/src/qwt_magnifier.cpp | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/src/libpcp_qwt/src/qwt_magnifier.cpp b/src/libpcp_qwt/src/qwt_magnifier.cpp new file mode 100644 index 0000000..5e8ffb0 --- /dev/null +++ b/src/libpcp_qwt/src/qwt_magnifier.cpp @@ -0,0 +1,467 @@ +/* -*- mode: C++ ; c-file-style: "stroustrup" -*- ***************************** + * Qwt Widget Library + * Copyright (C) 1997 Josef Wilgen + * Copyright (C) 2002 Uwe Rathmann + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the Qwt License, Version 1.0 + *****************************************************************************/ + +#include "qwt_magnifier.h" +#include "qwt_math.h" +#include <qevent.h> +#include <qwidget.h> + +class QwtMagnifier::PrivateData +{ +public: + PrivateData(): + isEnabled( false ), + wheelFactor( 0.9 ), + wheelButtonState( Qt::NoButton ), + mouseFactor( 0.95 ), + mouseButton( Qt::RightButton ), + mouseButtonState( Qt::NoButton ), + keyFactor( 0.9 ), + zoomInKey( Qt::Key_Plus ), + zoomOutKey( Qt::Key_Minus ), + zoomInKeyModifiers( Qt::NoModifier ), + zoomOutKeyModifiers( Qt::NoModifier ), + mousePressed( false ) + { + } + + bool isEnabled; + + double wheelFactor; + int wheelButtonState; + + double mouseFactor; + int mouseButton; + int mouseButtonState; + + double keyFactor; + int zoomInKey; + int zoomOutKey; + int zoomInKeyModifiers; + int zoomOutKeyModifiers; + + bool mousePressed; + bool hasMouseTracking; + QPoint mousePos; +}; + +/*! + Constructor + \param parent Widget to be magnified +*/ +QwtMagnifier::QwtMagnifier( QWidget *parent ): + QObject( parent ) +{ + d_data = new PrivateData(); + setEnabled( true ); +} + +//! Destructor +QwtMagnifier::~QwtMagnifier() +{ + delete d_data; +} + +/*! + \brief En/disable the magnifier + + When enabled is true an event filter is installed for + the observed widget, otherwise the event filter is removed. + + \param on true or false + \sa isEnabled(), eventFilter() +*/ +void QwtMagnifier::setEnabled( bool on ) +{ + if ( d_data->isEnabled != on ) + { + d_data->isEnabled = on; + + QObject *o = parent(); + if ( o ) + { + if ( d_data->isEnabled ) + o->installEventFilter( this ); + else + o->removeEventFilter( this ); + } + } +} + +/*! + \return true when enabled, false otherwise + \sa setEnabled(), eventFilter() +*/ +bool QwtMagnifier::isEnabled() const +{ + return d_data->isEnabled; +} + +/*! + \brief Change the wheel factor + + The wheel factor defines the ratio between the current range + on the parent widget and the zoomed range for each step of the wheel. + The default value is 0.9. + + \param factor Wheel factor + \sa wheelFactor(), setWheelButtonState(), + setMouseFactor(), setKeyFactor() +*/ +void QwtMagnifier::setWheelFactor( double factor ) +{ + d_data->wheelFactor = factor; +} + +/*! + \return Wheel factor + \sa setWheelFactor() +*/ +double QwtMagnifier::wheelFactor() const +{ + return d_data->wheelFactor; +} + +/*! + Assign a mandatory button state for zooming in/out using the wheel. + The default button state is Qt::NoButton. + + \param buttonState Button state + \sa wheelButtonState() +*/ +void QwtMagnifier::setWheelButtonState( int buttonState ) +{ + d_data->wheelButtonState = buttonState; +} + +/*! + \return Wheel button state + \sa setWheelButtonState() +*/ +int QwtMagnifier::wheelButtonState() const +{ + return d_data->wheelButtonState; +} + +/*! + \brief Change the mouse factor + + The mouse factor defines the ratio between the current range + on the parent widget and the zoomed range for each vertical mouse movement. + The default value is 0.95. + + \param factor Wheel factor + \sa mouseFactor(), setMouseButton(), setWheelFactor(), setKeyFactor() +*/ +void QwtMagnifier::setMouseFactor( double factor ) +{ + d_data->mouseFactor = factor; +} + +/*! + \return Mouse factor + \sa setMouseFactor() +*/ +double QwtMagnifier::mouseFactor() const +{ + return d_data->mouseFactor; +} + +/*! + Assign the mouse button, that is used for zooming in/out. + The default value is Qt::RightButton. + + \param button Button + \param buttonState Button state + \sa getMouseButton() +*/ +void QwtMagnifier::setMouseButton( int button, int buttonState ) +{ + d_data->mouseButton = button; + d_data->mouseButtonState = buttonState; +} + +//! \sa setMouseButton() +void QwtMagnifier::getMouseButton( + int &button, int &buttonState ) const +{ + button = d_data->mouseButton; + buttonState = d_data->mouseButtonState; +} + +/*! + \brief Change the key factor + + The key factor defines the ratio between the current range + on the parent widget and the zoomed range for each key press of + the zoom in/out keys. The default value is 0.9. + + \param factor Key factor + \sa keyFactor(), setZoomInKey(), setZoomOutKey(), + setWheelFactor, setMouseFactor() +*/ +void QwtMagnifier::setKeyFactor( double factor ) +{ + d_data->keyFactor = factor; +} + +/*! + \return Key factor + \sa setKeyFactor() +*/ +double QwtMagnifier::keyFactor() const +{ + return d_data->keyFactor; +} + +/*! + Assign the key, that is used for zooming in. + The default combination is Qt::Key_Plus + Qt::NoModifier. + + \param key + \param modifiers + \sa getZoomInKey(), setZoomOutKey() +*/ +void QwtMagnifier::setZoomInKey( int key, int modifiers ) +{ + d_data->zoomInKey = key; + d_data->zoomInKeyModifiers = modifiers; +} + +//! \sa setZoomInKey() +void QwtMagnifier::getZoomInKey( int &key, int &modifiers ) const +{ + key = d_data->zoomInKey; + modifiers = d_data->zoomInKeyModifiers; +} + +/*! + Assign the key, that is used for zooming out. + The default combination is Qt::Key_Minus + Qt::NoModifier. + + \param key + \param modifiers + \sa getZoomOutKey(), setZoomOutKey() +*/ +void QwtMagnifier::setZoomOutKey( int key, int modifiers ) +{ + d_data->zoomOutKey = key; + d_data->zoomOutKeyModifiers = modifiers; +} + +//! \sa setZoomOutKey() +void QwtMagnifier::getZoomOutKey( int &key, int &modifiers ) const +{ + key = d_data->zoomOutKey; + modifiers = d_data->zoomOutKeyModifiers; +} + +/*! + \brief Event filter + + When isEnabled() the mouse events of the observed widget are filtered. + + \param object Object to be filtered + \param event Event + + \sa widgetMousePressEvent(), widgetMouseReleaseEvent(), + widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent() + widgetKeyReleaseEvent() +*/ +bool QwtMagnifier::eventFilter( QObject *object, QEvent *event ) +{ + if ( object && object == parent() ) + { + switch ( event->type() ) + { + case QEvent::MouseButtonPress: + { + widgetMousePressEvent( ( QMouseEvent * )event ); + break; + } + case QEvent::MouseMove: + { + widgetMouseMoveEvent( ( QMouseEvent * )event ); + break; + } + case QEvent::MouseButtonRelease: + { + widgetMouseReleaseEvent( ( QMouseEvent * )event ); + break; + } + case QEvent::Wheel: + { + widgetWheelEvent( ( QWheelEvent * )event ); + break; + } + case QEvent::KeyPress: + { + widgetKeyPressEvent( ( QKeyEvent * )event ); + break; + } + case QEvent::KeyRelease: + { + widgetKeyReleaseEvent( ( QKeyEvent * )event ); + break; + } + default:; + } + } + return QObject::eventFilter( object, event ); +} + +/*! + Handle a mouse press event for the observed widget. + + \param mouseEvent Mouse event + \sa eventFilter(), widgetMouseReleaseEvent(), widgetMouseMoveEvent() +*/ +void QwtMagnifier::widgetMousePressEvent( QMouseEvent *mouseEvent ) +{ + if ( ( mouseEvent->button() != d_data->mouseButton) + || parentWidget() == NULL ) + { + return; + } + + if ( ( mouseEvent->modifiers() & Qt::KeyboardModifierMask ) != + ( int )( d_data->mouseButtonState & Qt::KeyboardModifierMask ) ) + { + return; + } + + d_data->hasMouseTracking = parentWidget()->hasMouseTracking(); + parentWidget()->setMouseTracking( true ); + d_data->mousePos = mouseEvent->pos(); + d_data->mousePressed = true; +} + +/*! + Handle a mouse release event for the observed widget. + + \param mouseEvent Mouse event + + \sa eventFilter(), widgetMousePressEvent(), widgetMouseMoveEvent(), +*/ +void QwtMagnifier::widgetMouseReleaseEvent( QMouseEvent *mouseEvent ) +{ + Q_UNUSED( mouseEvent ); + + if ( d_data->mousePressed && parentWidget() ) + { + d_data->mousePressed = false; + parentWidget()->setMouseTracking( d_data->hasMouseTracking ); + } +} + +/*! + Handle a mouse move event for the observed widget. + + \param mouseEvent Mouse event + \sa eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), +*/ +void QwtMagnifier::widgetMouseMoveEvent( QMouseEvent *mouseEvent ) +{ + if ( !d_data->mousePressed ) + return; + + const int dy = mouseEvent->pos().y() - d_data->mousePos.y(); + if ( dy != 0 ) + { + double f = d_data->mouseFactor; + if ( dy < 0 ) + f = 1 / f; + + rescale( f ); + } + + d_data->mousePos = mouseEvent->pos(); +} + +/*! + Handle a wheel event for the observed widget. + + \param wheelEvent Wheel event + \sa eventFilter() +*/ +void QwtMagnifier::widgetWheelEvent( QWheelEvent *wheelEvent ) +{ + if ( ( wheelEvent->modifiers() & Qt::KeyboardModifierMask ) != + ( int )( d_data->wheelButtonState & Qt::KeyboardModifierMask ) ) + { + return; + } + + if ( d_data->wheelFactor != 0.0 ) + { + /* + A positive delta indicates that the wheel was + rotated forwards away from the user; a negative + value indicates that the wheel was rotated + backwards toward the user. + Most mouse types work in steps of 15 degrees, + in which case the delta value is a multiple + of 120 (== 15 * 8). + */ + double f = qPow( d_data->wheelFactor, + qAbs( wheelEvent->delta() / 120.0 ) ); + + if ( wheelEvent->delta() > 0 ) + f = 1 / f; + + rescale( f ); + } +} + +/*! + Handle a key press event for the observed widget. + + \param keyEvent Key event + \sa eventFilter(), widgetKeyReleaseEvent() +*/ +void QwtMagnifier::widgetKeyPressEvent( QKeyEvent *keyEvent ) +{ + const int key = keyEvent->key(); + const int state = keyEvent->modifiers(); + + if ( key == d_data->zoomInKey && + state == d_data->zoomInKeyModifiers ) + { + rescale( d_data->keyFactor ); + } + else if ( key == d_data->zoomOutKey && + state == d_data->zoomOutKeyModifiers ) + { + rescale( 1.0 / d_data->keyFactor ); + } +} + +/*! + Handle a key release event for the observed widget. + + \param keyEvent Key event + \sa eventFilter(), widgetKeyReleaseEvent() +*/ +void QwtMagnifier::widgetKeyReleaseEvent( QKeyEvent *keyEvent ) +{ + Q_UNUSED( keyEvent ); +} + +//! \return Parent widget, where the rescaling happens +QWidget *QwtMagnifier::parentWidget() +{ + return qobject_cast<QWidget *>( parent() ); +} + +//! \return Parent widget, where the rescaling happens +const QWidget *QwtMagnifier::parentWidget() const +{ + return qobject_cast<const QWidget *>( parent() ); +} + |