diff options
Diffstat (limited to 'src/libpcp_qwt/src/qwt_picker.cpp')
| -rw-r--r-- | src/libpcp_qwt/src/qwt_picker.cpp | 1462 |
1 files changed, 1462 insertions, 0 deletions
diff --git a/src/libpcp_qwt/src/qwt_picker.cpp b/src/libpcp_qwt/src/qwt_picker.cpp new file mode 100644 index 0000000..2b7afa1 --- /dev/null +++ b/src/libpcp_qwt/src/qwt_picker.cpp @@ -0,0 +1,1462 @@ +/* -*- 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_picker.h" +#include "qwt_picker_machine.h" +#include "qwt_painter.h" +#include "qwt_math.h" +#include <qapplication.h> +#include <qevent.h> +#include <qpainter.h> +#include <qframe.h> +#include <qcursor.h> +#include <qbitmap.h> +#include <qpointer.h> +#include <qpaintengine.h> +#include <qmath.h> + +class QwtPicker::PickerWidget: public QWidget +{ +public: + enum Type + { + RubberBand, + Text + }; + + PickerWidget( QwtPicker *, QWidget *, Type ); + void updateMask(); + + /* + For a tracker text with a background we can use the background + rect as mask. Also for "regular" Qt widgets >= 4.3.0 we + don't need to mask the text anymore. + */ + bool d_hasTextMask; + +protected: + virtual void paintEvent( QPaintEvent * ); + virtual void resizeEvent( QResizeEvent * ); + + QwtPicker *d_picker; + Type d_type; +}; + +class QwtPicker::PrivateData +{ +public: + bool enabled; + + QwtPickerMachine *stateMachine; + + QwtPicker::ResizeMode resizeMode; + + QwtPicker::RubberBand rubberBand; + QPen rubberBandPen; + + QwtPicker::DisplayMode trackerMode; + QPen trackerPen; + QFont trackerFont; + + QPolygon pickedPoints; + bool isActive; + QPoint trackerPosition; + + bool mouseTracking; // used to save previous value + + /* + On X11 the widget below the picker widgets gets paint events + with a region that is the bounding rect of the mask, if it is complex. + In case of (f.e) a CrossRubberBand and a text this creates complete + repaints of the widget. So we better use two different widgets. + */ + + QPointer<PickerWidget> rubberBandWidget; + QPointer<PickerWidget> trackerWidget; +}; + +QwtPicker::PickerWidget::PickerWidget( + QwtPicker *picker, QWidget *parent, Type type ): + QWidget( parent ), + d_hasTextMask( false ), + d_picker( picker ), + d_type( type ) +{ + setAttribute( Qt::WA_TransparentForMouseEvents ); + setAttribute( Qt::WA_NoSystemBackground ); + setFocusPolicy( Qt::NoFocus ); +} + +void QwtPicker::PickerWidget::updateMask() +{ + QRegion mask; + + if ( d_type == RubberBand ) + { + QBitmap bm( width(), height() ); + bm.fill( Qt::color0 ); + + QPainter painter( &bm ); + QPen pen = d_picker->rubberBandPen(); + pen.setColor( Qt::color1 ); + painter.setPen( pen ); + + d_picker->drawRubberBand( &painter ); + + mask = QRegion( bm ); + } + if ( d_type == Text ) + { + d_hasTextMask = parentWidget()->testAttribute( Qt::WA_PaintOnScreen ); + + if ( d_hasTextMask ) + { + const QwtText label = d_picker->trackerText( + d_picker->trackerPosition() ); + + if ( label.testPaintAttribute( QwtText::PaintBackground ) + && label.backgroundBrush().style() != Qt::NoBrush ) + { + if ( label.backgroundBrush().color().alpha() > 0 ) + { + // We don't need a text mask, when we have a background + d_hasTextMask = false; + } + } + } + + if ( d_hasTextMask ) + { + QBitmap bm( width(), height() ); + bm.fill( Qt::color0 ); + + QPainter painter( &bm ); + painter.setFont( font() ); + + QPen pen = d_picker->trackerPen(); + pen.setColor( Qt::color1 ); + painter.setPen( pen ); + + d_picker->drawTracker( &painter ); + + mask = QRegion( bm ); + } + else + { + mask = d_picker->trackerRect( font() ); + } + } + + QWidget *w = parentWidget(); + if ( w && !w->testAttribute( Qt::WA_PaintOnScreen ) ) + { + // The parent widget gets an update for its complete rectangle + // when the mask is changed in visible state. + // With this hide/show we only get an update for the + // previous mask. + + hide(); + } + setMask( mask ); + setVisible( !mask.isEmpty() ); +} + +void QwtPicker::PickerWidget::paintEvent( QPaintEvent *e ) +{ + QPainter painter( this ); + painter.setClipRegion( e->region() ); + + if ( d_type == RubberBand ) + { + painter.setPen( d_picker->rubberBandPen() ); + d_picker->drawRubberBand( &painter ); + } + + if ( d_type == Text ) + { + /* + If we have a text mask we simply fill the region of + the mask. This gives better results for antialiased fonts. + */ + if ( d_hasTextMask ) + { + painter.fillRect( e->rect(), + QBrush( d_picker->trackerPen().color() ) ); + } + else + { + painter.setPen( d_picker->trackerPen() ); + d_picker->drawTracker( &painter ); + } + } +} + +void QwtPicker::PickerWidget::resizeEvent( QResizeEvent *event ) +{ + QWidget::resizeEvent( event ); + if ( isVisible() ) + updateMask(); +} + +/*! + Constructor + + Creates an picker that is enabled, but without a state machine. + rubberband and tracker are disabled. + + \param parent Parent widget, that will be observed + */ + +QwtPicker::QwtPicker( QWidget *parent ): + QObject( parent ) +{ + init( parent, NoRubberBand, AlwaysOff ); +} + +/*! + Constructor + + \param rubberBand Rubberband style + \param trackerMode Tracker mode + \param parent Parent widget, that will be observed + */ +QwtPicker::QwtPicker( RubberBand rubberBand, + DisplayMode trackerMode, QWidget *parent ): + QObject( parent ) +{ + init( parent, rubberBand, trackerMode ); +} + +//! Destructor +QwtPicker::~QwtPicker() +{ + setMouseTracking( false ); + delete d_data->stateMachine; + delete d_data->rubberBandWidget; + delete d_data->trackerWidget; + delete d_data; +} + +//! Init the picker, used by the constructors +void QwtPicker::init( QWidget *parent, + RubberBand rubberBand, DisplayMode trackerMode ) +{ + d_data = new PrivateData; + + d_data->rubberBandWidget = NULL; + d_data->trackerWidget = NULL; + + d_data->rubberBand = rubberBand; + d_data->enabled = false; + d_data->resizeMode = Stretch; + d_data->trackerMode = AlwaysOff; + d_data->isActive = false; + d_data->trackerPosition = QPoint( -1, -1 ); + d_data->mouseTracking = false; + + d_data->stateMachine = NULL; + + if ( parent ) + { + if ( parent->focusPolicy() == Qt::NoFocus ) + parent->setFocusPolicy( Qt::WheelFocus ); + + d_data->trackerFont = parent->font(); + d_data->mouseTracking = parent->hasMouseTracking(); + setEnabled( true ); + } + setTrackerMode( trackerMode ); +} + +/*! + Set a state machine and delete the previous one + + \param stateMachine State machine + \sa stateMachine() +*/ +void QwtPicker::setStateMachine( QwtPickerMachine *stateMachine ) +{ + if ( d_data->stateMachine != stateMachine ) + { + reset(); + + delete d_data->stateMachine; + d_data->stateMachine = stateMachine; + + if ( d_data->stateMachine ) + d_data->stateMachine->reset(); + } +} + +/*! + \return Assigned state machine + \sa setStateMachine() +*/ +QwtPickerMachine *QwtPicker::stateMachine() +{ + return d_data->stateMachine; +} + +/*! + \return Assigned state machine + \sa setStateMachine() +*/ +const QwtPickerMachine *QwtPicker::stateMachine() const +{ + return d_data->stateMachine; +} + +//! Return the parent widget, where the selection happens +QWidget *QwtPicker::parentWidget() +{ + QObject *obj = parent(); + if ( obj && obj->isWidgetType() ) + return static_cast<QWidget *>( obj ); + + return NULL; +} + +//! Return the parent widget, where the selection happens +const QWidget *QwtPicker::parentWidget() const +{ + QObject *obj = parent(); + if ( obj && obj->isWidgetType() ) + return static_cast< const QWidget *>( obj ); + + return NULL; +} + +/*! + Set the rubberband style + + \param rubberBand Rubberband style + The default value is NoRubberBand. + + \sa rubberBand(), RubberBand, setRubberBandPen() +*/ +void QwtPicker::setRubberBand( RubberBand rubberBand ) +{ + d_data->rubberBand = rubberBand; +} + +/*! + \return Rubberband style + \sa setRubberBand(), RubberBand, rubberBandPen() +*/ +QwtPicker::RubberBand QwtPicker::rubberBand() const +{ + return d_data->rubberBand; +} + +/*! + \brief Set the display mode of the tracker. + + A tracker displays information about current position of + the cursor as a string. The display mode controls + if the tracker has to be displayed whenever the observed + widget has focus and cursor (AlwaysOn), never (AlwaysOff), or + only when the selection is active (ActiveOnly). + + \param mode Tracker display mode + + \warning In case of AlwaysOn, mouseTracking will be enabled + for the observed widget. + \sa trackerMode(), DisplayMode +*/ + +void QwtPicker::setTrackerMode( DisplayMode mode ) +{ + if ( d_data->trackerMode != mode ) + { + d_data->trackerMode = mode; + setMouseTracking( d_data->trackerMode == AlwaysOn ); + } +} + +/*! + \return Tracker display mode + \sa setTrackerMode(), DisplayMode +*/ +QwtPicker::DisplayMode QwtPicker::trackerMode() const +{ + return d_data->trackerMode; +} + +/*! + \brief Set the resize mode. + + The resize mode controls what to do with the selected points of an active + selection when the observed widget is resized. + + Stretch means the points are scaled according to the new + size, KeepSize means the points remain unchanged. + + The default mode is Stretch. + + \param mode Resize mode + \sa resizeMode(), ResizeMode +*/ +void QwtPicker::setResizeMode( ResizeMode mode ) +{ + d_data->resizeMode = mode; +} + +/*! + \return Resize mode + \sa setResizeMode(), ResizeMode +*/ + +QwtPicker::ResizeMode QwtPicker::resizeMode() const +{ + return d_data->resizeMode; +} + +/*! + \brief En/disable the picker + + When enabled is true an event filter is installed for + the observed widget, otherwise the event filter is removed. + + \param enabled true or false + \sa isEnabled(), eventFilter() +*/ +void QwtPicker::setEnabled( bool enabled ) +{ + if ( d_data->enabled != enabled ) + { + d_data->enabled = enabled; + + QWidget *w = parentWidget(); + if ( w ) + { + if ( enabled ) + w->installEventFilter( this ); + else + w->removeEventFilter( this ); + } + + updateDisplay(); + } +} + +/*! + \return true when enabled, false otherwise + \sa setEnabled(), eventFilter() +*/ + +bool QwtPicker::isEnabled() const +{ + return d_data->enabled; +} + +/*! + Set the font for the tracker + + \param font Tracker font + \sa trackerFont(), setTrackerMode(), setTrackerPen() +*/ +void QwtPicker::setTrackerFont( const QFont &font ) +{ + if ( font != d_data->trackerFont ) + { + d_data->trackerFont = font; + updateDisplay(); + } +} + +/*! + \return Tracker font + \sa setTrackerFont(), trackerMode(), trackerPen() +*/ + +QFont QwtPicker::trackerFont() const +{ + return d_data->trackerFont; +} + +/*! + Set the pen for the tracker + + \param pen Tracker pen + \sa trackerPen(), setTrackerMode(), setTrackerFont() +*/ +void QwtPicker::setTrackerPen( const QPen &pen ) +{ + if ( pen != d_data->trackerPen ) + { + d_data->trackerPen = pen; + updateDisplay(); + } +} + +/*! + \return Tracker pen + \sa setTrackerPen(), trackerMode(), trackerFont() +*/ +QPen QwtPicker::trackerPen() const +{ + return d_data->trackerPen; +} + +/*! + Set the pen for the rubberband + + \param pen Rubberband pen + \sa rubberBandPen(), setRubberBand() +*/ +void QwtPicker::setRubberBandPen( const QPen &pen ) +{ + if ( pen != d_data->rubberBandPen ) + { + d_data->rubberBandPen = pen; + updateDisplay(); + } +} + +/*! + \return Rubberband pen + \sa setRubberBandPen(), rubberBand() +*/ +QPen QwtPicker::rubberBandPen() const +{ + return d_data->rubberBandPen; +} + +/*! + \brief Return the label for a position + + In case of HLineRubberBand the label is the value of the + y position, in case of VLineRubberBand the value of the x position. + Otherwise the label contains x and y position separated by a ',' . + + The format for the string conversion is "%d". + + \param pos Position + \return Converted position as string +*/ + +QwtText QwtPicker::trackerText( const QPoint &pos ) const +{ + QString label; + + switch ( rubberBand() ) + { + case HLineRubberBand: + label.sprintf( "%d", pos.y() ); + break; + case VLineRubberBand: + label.sprintf( "%d", pos.x() ); + break; + default: + label.sprintf( "%d, %d", pos.x(), pos.y() ); + } + return label; +} + +/*! + Draw a rubberband, depending on rubberBand() + + \param painter Painter, initialized with clip rect + + \sa rubberBand(), RubberBand +*/ + +void QwtPicker::drawRubberBand( QPainter *painter ) const +{ + if ( !isActive() || rubberBand() == NoRubberBand || + rubberBandPen().style() == Qt::NoPen ) + { + return; + } + + const QRect &pRect = pickRect(); + const QPolygon pa = adjustedPoints( d_data->pickedPoints ); + + QwtPickerMachine::SelectionType selectionType = + QwtPickerMachine::NoSelection; + + if ( d_data->stateMachine ) + selectionType = d_data->stateMachine->selectionType(); + + switch ( selectionType ) + { + case QwtPickerMachine::NoSelection: + case QwtPickerMachine::PointSelection: + { + if ( pa.count() < 1 ) + return; + + const QPoint pos = pa[0]; + + switch ( rubberBand() ) + { + case VLineRubberBand: + QwtPainter::drawLine( painter, pos.x(), + pRect.top(), pos.x(), pRect.bottom() ); + break; + + case HLineRubberBand: + QwtPainter::drawLine( painter, pRect.left(), + pos.y(), pRect.right(), pos.y() ); + break; + + case CrossRubberBand: + QwtPainter::drawLine( painter, pos.x(), + pRect.top(), pos.x(), pRect.bottom() ); + QwtPainter::drawLine( painter, pRect.left(), + pos.y(), pRect.right(), pos.y() ); + break; + default: + break; + } + break; + } + case QwtPickerMachine::RectSelection: + { + if ( pa.count() < 2 ) + return; + + const QPoint p1 = pa[0]; + const QPoint p2 = pa[int( pa.count() - 1 )]; + + const QRect rect = QRect( p1, p2 ).normalized(); + switch ( rubberBand() ) + { + case EllipseRubberBand: + QwtPainter::drawEllipse( painter, rect ); + break; + case RectRubberBand: + QwtPainter::drawRect( painter, rect ); + break; + default: + break; + } + break; + } + case QwtPickerMachine::PolygonSelection: + { + if ( rubberBand() == PolygonRubberBand ) + painter->drawPolyline( pa ); + break; + } + default: + break; + } +} + +/*! + Draw the tracker + + \param painter Painter + \sa trackerRect(), trackerText() +*/ + +void QwtPicker::drawTracker( QPainter *painter ) const +{ + const QRect textRect = trackerRect( painter->font() ); + if ( !textRect.isEmpty() ) + { + const QwtText label = trackerText( d_data->trackerPosition ); + if ( !label.isEmpty() ) + label.draw( painter, textRect ); + } +} + +/*! + \brief Map the pickedPoints() into a selection() + + adjustedPoints() maps the points, that have been collected on + the parentWidget() into a selection(). The default implementation + simply returns the points unmodified. + + The reason, why a selection() differs from the picked points + depends on the application requirements. F.e. : + + - A rectangular selection might need to have a specific aspect ratio only.\n + - A selection could accept non intersecting polygons only.\n + - ...\n + + The example below is for a rectangular selection, where the first + point is the center of the selected rectangle. + \par Example + \verbatim QPolygon MyPicker::adjustedPoints(const QPolygon &points) const +{ + QPolygon adjusted; + if ( points.size() == 2 ) + { + const int width = qAbs(points[1].x() - points[0].x()); + const int height = qAbs(points[1].y() - points[0].y()); + + QRect rect(0, 0, 2 * width, 2 * height); + rect.moveCenter(points[0]); + + adjusted += rect.topLeft(); + adjusted += rect.bottomRight(); + } + return adjusted; +}\endverbatim\n +*/ +QPolygon QwtPicker::adjustedPoints( const QPolygon &points ) const +{ + return points; +} + +/*! + \return Selected points + \sa pickedPoints(), adjustedPoints() +*/ +QPolygon QwtPicker::selection() const +{ + return adjustedPoints( d_data->pickedPoints ); +} + +//! \return Current position of the tracker +QPoint QwtPicker::trackerPosition() const +{ + return d_data->trackerPosition; +} + +/*! + Calculate the bounding rectangle for the tracker text + from the current position of the tracker + + \param font Font of the tracker text + \return Bounding rectangle of the tracker text + + \sa trackerPosition() +*/ +QRect QwtPicker::trackerRect( const QFont &font ) const +{ + if ( trackerMode() == AlwaysOff || + ( trackerMode() == ActiveOnly && !isActive() ) ) + { + return QRect(); + } + + if ( d_data->trackerPosition.x() < 0 || d_data->trackerPosition.y() < 0 ) + return QRect(); + + QwtText text = trackerText( d_data->trackerPosition ); + if ( text.isEmpty() ) + return QRect(); + + const QSizeF textSize = text.textSize( font ); + QRect textRect( 0, 0, qCeil( textSize.width() ), qCeil( textSize.height() ) ); + + const QPoint &pos = d_data->trackerPosition; + + int alignment = 0; + if ( isActive() && d_data->pickedPoints.count() > 1 + && rubberBand() != NoRubberBand ) + { + const QPoint last = + d_data->pickedPoints[int( d_data->pickedPoints.count() ) - 2]; + + alignment |= ( pos.x() >= last.x() ) ? Qt::AlignRight : Qt::AlignLeft; + alignment |= ( pos.y() > last.y() ) ? Qt::AlignBottom : Qt::AlignTop; + } + else + alignment = Qt::AlignTop | Qt::AlignRight; + + const int margin = 5; + + int x = pos.x(); + if ( alignment & Qt::AlignLeft ) + x -= textRect.width() + margin; + else if ( alignment & Qt::AlignRight ) + x += margin; + + int y = pos.y(); + if ( alignment & Qt::AlignBottom ) + y += margin; + else if ( alignment & Qt::AlignTop ) + y -= textRect.height() + margin; + + textRect.moveTopLeft( QPoint( x, y ) ); + + int right = qMin( textRect.right(), pickRect().right() - margin ); + int bottom = qMin( textRect.bottom(), pickRect().bottom() - margin ); + textRect.moveBottomRight( QPoint( right, bottom ) ); + + int left = qMax( textRect.left(), pickRect().left() + margin ); + int top = qMax( textRect.top(), pickRect().top() + margin ); + textRect.moveTopLeft( QPoint( left, top ) ); + + return textRect; +} + +/*! + \brief Event filter + + When isEnabled() == true all events of the observed widget are filtered. + Mouse and keyboard events are translated into widgetMouse- and widgetKey- + and widgetWheel-events. Paint and Resize events are handled to keep + rubberband and tracker up to date. + + \param object Object to be filtered + \param event Event + + \sa widgetEnterEvent(), widgetLeaveEvent(), + widgetMousePressEvent(), widgetMouseReleaseEvent(), + widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), + widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent(), + QObject::installEventFilter(), QObject::event() +*/ +bool QwtPicker::eventFilter( QObject *object, QEvent *event ) +{ + if ( object && object == parentWidget() ) + { + switch ( event->type() ) + { + case QEvent::Resize: + { + const QResizeEvent *re = ( QResizeEvent * )event; + if ( d_data->resizeMode == Stretch ) + stretchSelection( re->oldSize(), re->size() ); + + if ( d_data->rubberBandWidget ) + d_data->rubberBandWidget->resize( re->size() ); + + if ( d_data->trackerWidget ) + d_data->trackerWidget->resize( re->size() ); + break; + } + case QEvent::Enter: + { + widgetEnterEvent( event ); + break; + } + case QEvent::Leave: + { + widgetLeaveEvent( event ); + break; + } + case QEvent::MouseButtonPress: + { + widgetMousePressEvent( ( QMouseEvent * )event ); + break; + } + case QEvent::MouseButtonRelease: + { + widgetMouseReleaseEvent( ( QMouseEvent * )event ); + break; + } + case QEvent::MouseButtonDblClick: + { + widgetMouseDoubleClickEvent( ( QMouseEvent * )event ); + break; + } + case QEvent::MouseMove: + { + widgetMouseMoveEvent( ( QMouseEvent * )event ); + break; + } + case QEvent::KeyPress: + { + widgetKeyPressEvent( ( QKeyEvent * )event ); + break; + } + case QEvent::KeyRelease: + { + widgetKeyReleaseEvent( ( QKeyEvent * )event ); + break; + } + case QEvent::Wheel: + { + widgetWheelEvent( ( QWheelEvent * )event ); + break; + } + default: + break; + } + } + return false; +} + +/*! + Handle a mouse press event for the observed widget. + + \param mouseEvent Mouse event + + \sa eventFilter(), widgetMouseReleaseEvent(), + widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), + widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent() +*/ +void QwtPicker::widgetMousePressEvent( QMouseEvent *mouseEvent ) +{ + transition( mouseEvent ); +} + +/*! + Handle a mouse move event for the observed widget. + + \param mouseEvent Mouse event + + \sa eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), + widgetMouseDoubleClickEvent(), + widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent() +*/ +void QwtPicker::widgetMouseMoveEvent( QMouseEvent *mouseEvent ) +{ + if ( pickRect().contains( mouseEvent->pos() ) ) + d_data->trackerPosition = mouseEvent->pos(); + else + d_data->trackerPosition = QPoint( -1, -1 ); + + if ( !isActive() ) + updateDisplay(); + + transition( mouseEvent ); +} + +/*! + Handle a enter event for the observed widget. + + \param event Qt event + + \sa eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), + widgetMouseDoubleClickEvent(), + widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent() +*/ +void QwtPicker::widgetEnterEvent( QEvent *event ) +{ + transition( event ); +} + +/*! + Handle a leave event for the observed widget. + + \param event Qt event + + \sa eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), + widgetMouseDoubleClickEvent(), + widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent() +*/ +void QwtPicker::widgetLeaveEvent( QEvent *event ) +{ + transition( event ); + + d_data->trackerPosition = QPoint( -1, -1 ); + if ( !isActive() ) + updateDisplay(); +} + +/*! + Handle a mouse relase event for the observed widget. + + \param mouseEvent Mouse event + + \sa eventFilter(), widgetMousePressEvent(), + widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), + widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent() +*/ +void QwtPicker::widgetMouseReleaseEvent( QMouseEvent *mouseEvent ) +{ + transition( mouseEvent ); +} + +/*! + Handle mouse double click event for the observed widget. + + \param mouseEvent Mouse event + + \sa eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), + widgetMouseMoveEvent(), + widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent() +*/ +void QwtPicker::widgetMouseDoubleClickEvent( QMouseEvent *mouseEvent ) +{ + transition( mouseEvent ); +} + + +/*! + Handle a wheel event for the observed widget. + + Move the last point of the selection in case of isActive() == true + + \param wheelEvent Wheel event + + \sa eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), + widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), + widgetKeyPressEvent(), widgetKeyReleaseEvent() +*/ +void QwtPicker::widgetWheelEvent( QWheelEvent *wheelEvent ) +{ + if ( pickRect().contains( wheelEvent->pos() ) ) + d_data->trackerPosition = wheelEvent->pos(); + else + d_data->trackerPosition = QPoint( -1, -1 ); + + updateDisplay(); + + transition( wheelEvent ); +} + +/*! + Handle a key press event for the observed widget. + + Selections can be completely done by the keyboard. The arrow keys + move the cursor, the abort key aborts a selection. All other keys + are handled by the current state machine. + + \param keyEvent Key event + + \sa eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), + widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), + widgetWheelEvent(), widgetKeyReleaseEvent(), stateMachine(), + QwtEventPattern::KeyPatternCode +*/ +void QwtPicker::widgetKeyPressEvent( QKeyEvent *keyEvent ) +{ + int dx = 0; + int dy = 0; + + int offset = 1; + if ( keyEvent->isAutoRepeat() ) + offset = 5; + + if ( keyMatch( KeyLeft, keyEvent ) ) + dx = -offset; + else if ( keyMatch( KeyRight, keyEvent ) ) + dx = offset; + else if ( keyMatch( KeyUp, keyEvent ) ) + dy = -offset; + else if ( keyMatch( KeyDown, keyEvent ) ) + dy = offset; + else if ( keyMatch( KeyAbort, keyEvent ) ) + { + reset(); + } + else + transition( keyEvent ); + + if ( dx != 0 || dy != 0 ) + { + const QRect rect = pickRect(); + const QPoint pos = parentWidget()->mapFromGlobal( QCursor::pos() ); + + int x = pos.x() + dx; + x = qMax( rect.left(), x ); + x = qMin( rect.right(), x ); + + int y = pos.y() + dy; + y = qMax( rect.top(), y ); + y = qMin( rect.bottom(), y ); + + QCursor::setPos( parentWidget()->mapToGlobal( QPoint( x, y ) ) ); + } +} + +/*! + Handle a key release event for the observed widget. + + Passes the event to the state machine. + + \param keyEvent Key event + + \sa eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), + widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), + widgetWheelEvent(), widgetKeyPressEvent(), stateMachine() +*/ +void QwtPicker::widgetKeyReleaseEvent( QKeyEvent *keyEvent ) +{ + transition( keyEvent ); +} + +/*! + Passes an event to the state machine and executes the resulting + commands. Append and Move commands use the current position + of the cursor (QCursor::pos()). + + \param event Event +*/ +void QwtPicker::transition( const QEvent *event ) +{ + if ( !d_data->stateMachine ) + return; + + const QList<QwtPickerMachine::Command> commandList = + d_data->stateMachine->transition( *this, event ); + + QPoint pos; + switch ( event->type() ) + { + case QEvent::MouseButtonDblClick: + case QEvent::MouseButtonPress: + case QEvent::MouseButtonRelease: + case QEvent::MouseMove: + { + const QMouseEvent *me = + static_cast< const QMouseEvent * >( event ); + pos = me->pos(); + break; + } + default: + pos = parentWidget()->mapFromGlobal( QCursor::pos() ); + } + + for ( int i = 0; i < commandList.count(); i++ ) + { + switch ( commandList[i] ) + { + case QwtPickerMachine::Begin: + { + begin(); + break; + } + case QwtPickerMachine::Append: + { + append( pos ); + break; + } + case QwtPickerMachine::Move: + { + move( pos ); + break; + } + case QwtPickerMachine::Remove: + { + remove(); + break; + } + case QwtPickerMachine::End: + { + end(); + break; + } + } + } +} + +/*! + Open a selection setting the state to active + + \sa isActive(), end(), append(), move() +*/ +void QwtPicker::begin() +{ + if ( d_data->isActive ) + return; + + d_data->pickedPoints.resize( 0 ); + d_data->isActive = true; + Q_EMIT activated( true ); + + if ( trackerMode() != AlwaysOff ) + { + if ( d_data->trackerPosition.x() < 0 || d_data->trackerPosition.y() < 0 ) + { + QWidget *w = parentWidget(); + if ( w ) + d_data->trackerPosition = w->mapFromGlobal( QCursor::pos() ); + } + } + + updateDisplay(); + setMouseTracking( true ); +} + +/*! + \brief Close a selection setting the state to inactive. + + The selection is validated and maybe fixed by accept(). + + \param ok If true, complete the selection and emit a selected signal + otherwise discard the selection. + \return true if the selection is accepted, false otherwise + \sa isActive(), begin(), append(), move(), selected(), accept() +*/ +bool QwtPicker::end( bool ok ) +{ + if ( d_data->isActive ) + { + setMouseTracking( false ); + + d_data->isActive = false; + Q_EMIT activated( false ); + + if ( trackerMode() == ActiveOnly ) + d_data->trackerPosition = QPoint( -1, -1 ); + + if ( ok ) + ok = accept( d_data->pickedPoints ); + + if ( ok ) + Q_EMIT selected( d_data->pickedPoints ); + else + d_data->pickedPoints.resize( 0 ); + + updateDisplay(); + } + else + ok = false; + + return ok; +} + +/*! + Reset the state machine and terminate (end(false)) the selection +*/ +void QwtPicker::reset() +{ + if ( d_data->stateMachine ) + d_data->stateMachine->reset(); + + if ( isActive() ) + end( false ); +} + +/*! + Append a point to the selection and update rubberband and tracker. + The appended() signal is emitted. + + \param pos Additional point + + \sa isActive(), begin(), end(), move(), appended() +*/ +void QwtPicker::append( const QPoint &pos ) +{ + if ( d_data->isActive ) + { + const int idx = d_data->pickedPoints.count(); + d_data->pickedPoints.resize( idx + 1 ); + d_data->pickedPoints[idx] = pos; + + updateDisplay(); + Q_EMIT appended( pos ); + } +} + +/*! + Move the last point of the selection + The moved() signal is emitted. + + \param pos New position + \sa isActive(), begin(), end(), append() +*/ +void QwtPicker::move( const QPoint &pos ) +{ + if ( d_data->isActive ) + { + const int idx = d_data->pickedPoints.count() - 1; + if ( idx >= 0 ) + { + if ( d_data->pickedPoints[idx] != pos ) + { + d_data->pickedPoints[idx] = pos; + + updateDisplay(); + Q_EMIT moved( pos ); + } + } + } +} + +/*! + Remove the last point of the selection + The removed() signal is emitted. + + \sa isActive(), begin(), end(), append(), move() +*/ +void QwtPicker::remove() +{ + if ( d_data->isActive ) + { + const int idx = d_data->pickedPoints.count() - 1; + if ( idx > 0 ) + { + const int idx = d_data->pickedPoints.count(); + + const QPoint pos = d_data->pickedPoints[idx - 1]; + d_data->pickedPoints.resize( idx - 1 ); + + updateDisplay(); + Q_EMIT removed( pos ); + } + } +} + +/*! + \brief Validate and fixup the selection + + Accepts all selections unmodified + + \param selection Selection to validate and fixup + \return true, when accepted, false otherwise +*/ +bool QwtPicker::accept( QPolygon &selection ) const +{ + Q_UNUSED( selection ); + return true; +} + +/*! + A picker is active between begin() and end(). + \return true if the selection is active. +*/ +bool QwtPicker::isActive() const +{ + return d_data->isActive; +} + +/*! + Return the points, that have been collected so far. The selection() + is calculated from the pickedPoints() in adjustedPoints(). + \return Picked points +*/ +const QPolygon &QwtPicker::pickedPoints() const +{ + return d_data->pickedPoints; +} + +/*! + Scale the selection by the ratios of oldSize and newSize + The changed() signal is emitted. + + \param oldSize Previous size + \param newSize Current size + + \sa ResizeMode, setResizeMode(), resizeMode() +*/ +void QwtPicker::stretchSelection( const QSize &oldSize, const QSize &newSize ) +{ + if ( oldSize.isEmpty() ) + { + // avoid division by zero. But scaling for small sizes also + // doesn't make much sense, because of rounding losses. TODO ... + return; + } + + const double xRatio = + double( newSize.width() ) / double( oldSize.width() ); + const double yRatio = + double( newSize.height() ) / double( oldSize.height() ); + + for ( int i = 0; i < int( d_data->pickedPoints.count() ); i++ ) + { + QPoint &p = d_data->pickedPoints[i]; + p.setX( qRound( p.x() * xRatio ) ); + p.setY( qRound( p.y() * yRatio ) ); + + Q_EMIT changed( d_data->pickedPoints ); + } +} + +/*! + Set mouse tracking for the observed widget. + + In case of enable is true, the previous value + is saved, that is restored when enable is false. + + \warning Even when enable is false, mouse tracking might be restored + to true. When mouseTracking for the observed widget + has been changed directly by QWidget::setMouseTracking + while mouse tracking has been set to true, this value can't + be restored. +*/ + +void QwtPicker::setMouseTracking( bool enable ) +{ + QWidget *widget = parentWidget(); + if ( !widget ) + return; + + if ( enable ) + { + d_data->mouseTracking = widget->hasMouseTracking(); + widget->setMouseTracking( true ); + } + else + { + widget->setMouseTracking( d_data->mouseTracking ); + } +} + +/*! + Find the area of the observed widget, where selection might happen. + + \return parentWidget()->contentsRect() +*/ +QRect QwtPicker::pickRect() const +{ + const QWidget *widget = parentWidget(); + if ( widget ) + return widget->contentsRect(); + + return QRect(); +} + +//! Update the state of rubberband and tracker label +void QwtPicker::updateDisplay() +{ + QWidget *w = parentWidget(); + + bool showRubberband = false; + bool showTracker = false; + if ( w && w->isVisible() && d_data->enabled ) + { + if ( rubberBand() != NoRubberBand && isActive() && + rubberBandPen().style() != Qt::NoPen ) + { + showRubberband = true; + } + + if ( trackerMode() == AlwaysOn || + ( trackerMode() == ActiveOnly && isActive() ) ) + { + if ( trackerPen() != Qt::NoPen ) + showTracker = true; + } + } + + QPointer<PickerWidget> &rw = d_data->rubberBandWidget; + if ( showRubberband ) + { + if ( rw.isNull() ) + { + rw = new PickerWidget( this, w, PickerWidget::RubberBand ); + rw->setObjectName( "PickerRubberBand" ); + rw->resize( w->size() ); + } + rw->updateMask(); + rw->update(); // Needed, when the mask doesn't change + } + else + delete rw; + + QPointer<PickerWidget> &tw = d_data->trackerWidget; + if ( showTracker ) + { + if ( tw.isNull() ) + { + tw = new PickerWidget( this, w, PickerWidget::Text ); + tw->setObjectName( "PickerTracker" ); + tw->resize( w->size() ); + } + tw->setFont( d_data->trackerFont ); + tw->updateMask(); + tw->update(); // Needed, when the mask doesn't change + } + else + delete tw; +} + +//! \return Widget displaying the rubberband +const QWidget *QwtPicker::rubberBandWidget() const +{ + return d_data->rubberBandWidget; +} + +//! \return Widget displaying the tracker text +const QWidget *QwtPicker::trackerWidget() const +{ + return d_data->trackerWidget; +} + |