QwtPicker Class Reference

QwtPicker provides selections on a widget. More...

#include <qwt_picker.h>

Inheritance diagram for QwtPicker:

Public Types
enum	RubberBand {   NoRubberBand = 0 , HLineRubberBand , VLineRubberBand , CrossRubberBand ,   RectRubberBand , EllipseRubberBand , PolygonRubberBand , UserRubberBand = 100 }
enum	DisplayMode { AlwaysOff , AlwaysOn , ActiveOnly }
	Display mode. More...
enum	ResizeMode { Stretch , KeepSize }
Public Types inherited from QwtEventPattern
enum	MousePatternCode {   MouseSelect1 , MouseSelect2 , MouseSelect3 , MouseSelect4 ,   MouseSelect5 , MouseSelect6 , MousePatternCount }
	Symbolic mouse input codes. More...
enum	KeyPatternCode {   KeySelect1 , KeySelect2 , KeyAbort , KeyLeft ,   KeyRight , KeyUp , KeyDown , KeyRedo ,   KeyUndo , KeyHome , KeyPatternCount }
	Symbolic keyboard input codes. More...

Public Slots
void	setEnabled (bool)
	En/disable the picker.

Signals
void	activated (bool on)
void	selected (const QPolygon &polygon)
void	appended (const QPoint &pos)
void	moved (const QPoint &pos)
void	removed (const QPoint &pos)
void	changed (const QPolygon &selection)

Public Member Functions
	QwtPicker (QWidget *parent)
	QwtPicker (RubberBand rubberBand, DisplayMode trackerMode, QWidget *)
virtual	~QwtPicker ()
	Destructor.
void	setStateMachine (QwtPickerMachine *)
const QwtPickerMachine *	stateMachine () const
QwtPickerMachine *	stateMachine ()
void	setRubberBand (RubberBand)
RubberBand	rubberBand () const
void	setTrackerMode (DisplayMode)
	Set the display mode of the tracker.
DisplayMode	trackerMode () const
void	setResizeMode (ResizeMode)
	Set the resize mode.
ResizeMode	resizeMode () const
void	setRubberBandPen (const QPen &)
QPen	rubberBandPen () const
void	setTrackerPen (const QPen &)
QPen	trackerPen () const
void	setTrackerFont (const QFont &)
QFont	trackerFont () const
bool	isEnabled () const
bool	isActive () const
virtual bool	eventFilter (QObject *, QEvent *) override
	Event filter.
QWidget *	parentWidget ()
	Return the parent widget, where the selection happens.
const QWidget *	parentWidget () const
	Return the parent widget, where the selection happens.
virtual QPainterPath	pickArea () const
virtual void	drawRubberBand (QPainter *) const
virtual void	drawTracker (QPainter *) const
virtual QRegion	trackerMask () const
virtual QRegion	rubberBandMask () const
virtual QwtText	trackerText (const QPoint &pos) const
	Return the label for a position.
QPoint	trackerPosition () const
virtual QRect	trackerRect (const QFont &) const
QPolygon	selection () const
Public Member Functions inherited from QwtEventPattern
	QwtEventPattern ()
virtual	~QwtEventPattern ()
	Destructor.
void	initMousePattern (int numButtons)
void	initKeyPattern ()
void	setMousePattern (MousePatternCode, Qt::MouseButton button, Qt::KeyboardModifiers=Qt::NoModifier)
void	setKeyPattern (KeyPatternCode, int key, Qt::KeyboardModifiers modifiers=Qt::NoModifier)
void	setMousePattern (const QVector< MousePattern > &)
	Change the mouse event patterns.
void	setKeyPattern (const QVector< KeyPattern > &)
	Change the key event patterns.
const QVector< MousePattern > &	mousePattern () const
const QVector< KeyPattern > &	keyPattern () const
QVector< MousePattern > &	mousePattern ()
QVector< KeyPattern > &	keyPattern ()
bool	mouseMatch (MousePatternCode, const QMouseEvent *) const
	Compare a mouse event with an event pattern.
bool	keyMatch (KeyPatternCode, const QKeyEvent *) const
	Compare a key event with an event pattern.

Protected Member Functions
virtual QPolygon	adjustedPoints (const QPolygon &) const
	Map the pickedPoints() into a selection()
virtual void	transition (const QEvent *)
virtual void	begin ()
virtual void	append (const QPoint &)
virtual void	move (const QPoint &)
virtual void	remove ()
virtual bool	end (bool ok=true)
	Close a selection setting the state to inactive.
virtual bool	accept (QPolygon &) const
	Validate and fix up the selection.
virtual void	reset ()
virtual void	widgetMousePressEvent (QMouseEvent *)
virtual void	widgetMouseReleaseEvent (QMouseEvent *)
virtual void	widgetMouseDoubleClickEvent (QMouseEvent *)
virtual void	widgetMouseMoveEvent (QMouseEvent *)
virtual void	widgetWheelEvent (QWheelEvent *)
virtual void	widgetKeyPressEvent (QKeyEvent *)
virtual void	widgetKeyReleaseEvent (QKeyEvent *)
virtual void	widgetEnterEvent (QEvent *)
virtual void	widgetLeaveEvent (QEvent *)
virtual void	stretchSelection (const QSize &oldSize, const QSize &newSize)
virtual void	updateDisplay ()
	Update the state of rubber band and tracker label.
const QwtWidgetOverlay *	rubberBandOverlay () const
const QwtWidgetOverlay *	trackerOverlay () const
const QPolygon &	pickedPoints () const
QRect	trackerRect (const QSize &) const
Protected Member Functions inherited from QwtEventPattern
virtual bool	mouseMatch (const MousePattern &, const QMouseEvent *) const
	Compare a mouse event with an event pattern.
virtual bool	keyMatch (const KeyPattern &, const QKeyEvent *) const
	Compare a key event with an event pattern.

Detailed Description

QwtPicker provides selections on a widget.

QwtPicker filters all enter, leave, mouse and keyboard events of a widget and translates them into an array of selected points.

The way how the points are collected depends on type of state machine that is connected to the picker. Qwt offers a couple of predefined state machines for selecting:

• Nothing
  QwtPickerTrackerMachine
• Single points
  QwtPickerClickPointMachine, QwtPickerDragPointMachine
• Rectangles
  QwtPickerClickRectMachine, QwtPickerDragRectMachine
• Polygons
  QwtPickerPolygonMachine

While these state machines cover the most common ways to collect points it is also possible to implement individual machines as well.

QwtPicker translates the picked points into a selection using the adjustedPoints() method. adjustedPoints() is intended to be reimplemented to fix up the selection according to application specific requirements. (F.e. when an application accepts rectangles of a fixed aspect ratio only.)

Optionally QwtPicker support the process of collecting points by a rubber band and tracker displaying a text for the current mouse position.

Example

#include <qwt_picker.h>
#include <qwt_picker_machine.h>
 
   QwtPicker *picker = new QwtPicker(widget);
   picker->setStateMachine(new QwtPickerDragRectMachine);
   picker->setTrackerMode(QwtPicker::ActiveOnly);
   picker->setRubberBand(QwtPicker::RectRubberBand);

The state machine triggers the following commands:

• begin()
  Activate/Initialize the selection.
• append()
  Add a new point
• move()
  Change the position of the last point.
• remove()
  Remove the last point.
• end()
  Terminate the selection and call accept to validate the picked points.

The picker is active (isActive()), between begin() and end(). In active state the rubber band is displayed, and the tracker is visible in case of trackerMode is ActiveOnly or AlwaysOn.

The cursor can be moved using the arrow keys. All selections can be aborted using the abort key. (QwtEventPattern::KeyPatternCode)

Warning

In case of QWidget::NoFocus the focus policy of the observed widget is set to QWidget::WheelFocus and mouse tracking will be manipulated while the picker is active, or if trackerMode() is AlwayOn.

Definition at line 103 of file qwt_picker.h.

Member Enumeration Documentation

DisplayMode

enum QwtPicker::DisplayMode

Display mode.

See also

setTrackerMode(), trackerMode(), isActive()

Enumerator
AlwaysOff	Display never.
AlwaysOn	Display always.
ActiveOnly	Display only when the selection is active.

Definition at line 161 of file qwt_picker.h.

ResizeMode

enum QwtPicker::ResizeMode

Controls what to do with the selected points of an active selection when the observed widget is resized.

The default value is QwtPicker::Stretch.

See also

setResizeMode()

Enumerator
Stretch	All points are scaled according to the new size,.
KeepSize	All points remain unchanged.

Definition at line 181 of file qwt_picker.h.

RubberBand

enum QwtPicker::RubberBand

Rubber band style

The default value is QwtPicker::NoRubberBand.

See also

setRubberBand(), rubberBand()

Enumerator
NoRubberBand	No rubberband.
HLineRubberBand	A horizontal line ( only for QwtPickerMachine::PointSelection )
VLineRubberBand	A vertical line ( only for QwtPickerMachine::PointSelection )
CrossRubberBand	A crosshair ( only for QwtPickerMachine::PointSelection )
RectRubberBand	A rectangle ( only for QwtPickerMachine::RectSelection )
EllipseRubberBand	An ellipse ( only for QwtPickerMachine::RectSelection )
PolygonRubberBand	A polygon ( only for QwtPickerMachine::PolygonSelection )
UserRubberBand	Values >= UserRubberBand can be used to define additional rubber bands.

Definition at line 127 of file qwt_picker.h.

Constructor & Destructor Documentation

QwtPicker() [1/2]

QwtPicker::QwtPicker ( QWidget * parent )

explicit

Constructor

Creates an picker that is enabled, but without a state machine. rubber band and tracker are disabled.

Parameters

parent

Parent widget, that will be observed

Definition at line 169 of file qwt_picker.cpp.

QwtPicker() [2/2]

QwtPicker::QwtPicker ( RubberBand rubberBand, DisplayMode trackerMode, QWidget * parent )

explicit

Constructor

Parameters

rubberBand	Rubber band style
trackerMode	Tracker mode
parent	Parent widget, that will be observed

Definition at line 182 of file qwt_picker.cpp.

~QwtPicker()

QwtPicker::~QwtPicker ( )

virtual

Destructor.

Definition at line 190 of file qwt_picker.cpp.

Member Function Documentation

accept()

bool QwtPicker::accept ( QPolygon & selection ) const

protectedvirtual

Validate and fix up the selection.

Accepts all selections unmodified

Parameters

selection

Selection to validate and fix up

Returns

true, when accepted, false otherwise

Reimplemented in QwtPlotZoomer.

Definition at line 1402 of file qwt_picker.cpp.

activated

void QwtPicker::activated ( bool on )

signal

A signal indicating, when the picker has been activated. Together with setEnabled() it can be used to implement selections with more than one picker.

Parameters

on	True, when the picker has been activated

adjustedPoints()

QPolygon QwtPicker::adjustedPoints ( const QPolygon & points ) const

protectedvirtual

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.
• A selection could accept non intersecting polygons only.
• ...

The example below is for a rectangular selection, where the first point is the center of the selected rectangle.

Example

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;
}

Parameters

points

Selected points

Returns

Selected points unmodified

Definition at line 783 of file qwt_picker.cpp.

append()

void QwtPicker::append ( const QPoint & pos )

protectedvirtual

Append a point to the selection and update rubber band and tracker. The appended() signal is emitted.

Parameters

pos	Additional point

See also

isActive(), begin(), end(), move(), appended()

Reimplemented in QwtPlotPicker, and QwtPolarPicker.

Definition at line 1339 of file qwt_picker.cpp.

appended

void QwtPicker::appended ( const QPoint & pos )

signal

A signal emitted when a point has been appended to the selection

Parameters

pos	Position of the appended point.

See also

append(). moved()

begin()

void QwtPicker::begin ( )

protectedvirtual

Open a selection setting the state to active

See also

isActive(), end(), append(), move()

Reimplemented in QwtPlotZoomer.

Definition at line 1258 of file qwt_picker.cpp.

changed

void QwtPicker::changed ( const QPolygon & selection )

signal

A signal emitted when the active selection has been changed. This might happen when the observed widget is resized.

Parameters

selection

Changed selection

See also

stretchSelection()

drawRubberBand()

void QwtPicker::drawRubberBand ( QPainter * painter ) const

virtual

Draw a rubber band, depending on rubberBand()

Parameters

painter

Painter, initialized with a clip region

See also

rubberBand(), RubberBand

Definition at line 637 of file qwt_picker.cpp.

drawTracker()

void QwtPicker::drawTracker ( QPainter * painter ) const

virtual

Draw the tracker

Parameters

painter

Painter

See also

trackerRect(), trackerText()

Definition at line 732 of file qwt_picker.cpp.

end()

bool QwtPicker::end ( bool ok = true )

protectedvirtual

Close a selection setting the state to inactive.

The selection is validated and maybe fixed by accept().

Parameters

ok	If true, complete the selection and emit a selected signal otherwise discard the selection.

Returns

true if the selection is accepted, false otherwise

See also

isActive(), begin(), append(), move(), selected(), accept()

Reimplemented in QwtPlotPicker, QwtPlotZoomer, and QwtPolarPicker.

Definition at line 1291 of file qwt_picker.cpp.

eventFilter()

bool QwtPicker::eventFilter ( QObject * object, QEvent * event )

overridevirtual

Event filter.

When isEnabled() is 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 rubber band and tracker up to date.

Parameters

object	Object to be filtered
event	Event

Returns

Always false.

See also

widgetEnterEvent(), widgetLeaveEvent(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent(), QObject::installEventFilter(), QObject::event()

Definition at line 912 of file qwt_picker.cpp.

isActive()

bool QwtPicker::isActive

(

)

const

A picker is active between begin() and end().

Returns

true if the selection is active.

Definition at line 1412 of file qwt_picker.cpp.

isEnabled()

bool QwtPicker::isEnabled

(

)

const

Returns

true when enabled, false otherwise

See also

setEnabled(), eventFilter()

Definition at line 400 of file qwt_picker.cpp.

move()

void QwtPicker::move ( const QPoint & pos )

protectedvirtual

Move the last point of the selection The moved() signal is emitted.

Parameters

pos	New position

See also

isActive(), begin(), end(), append()

Reimplemented in QwtPlotPicker, and QwtPolarPicker.

Definition at line 1357 of file qwt_picker.cpp.

moved

void QwtPicker::moved ( const QPoint & pos )

signal

A signal emitted whenever the last appended point of the selection has been moved.

Parameters

pos	Position of the moved last point of the selection.

See also

move(), appended()

parentWidget() [1/2]

QWidget * QwtPicker::parentWidget

(

)

Return the parent widget, where the selection happens.

Definition at line 263 of file qwt_picker.cpp.

parentWidget() [2/2]

const QWidget * QwtPicker::parentWidget

(

)

const

Return the parent widget, where the selection happens.

Definition at line 273 of file qwt_picker.cpp.

pickArea()

QPainterPath QwtPicker::pickArea ( ) const

virtual

Find the area of the observed widget, where selection might happen.

Returns

parentWidget()->contentsRect()

Reimplemented in QwtPolarPicker.

Definition at line 1493 of file qwt_picker.cpp.

pickedPoints()

const QPolygon & QwtPicker::pickedPoints ( ) const

protected

Return the points, that have been collected so far. The selection() is calculated from the pickedPoints() in adjustedPoints().

Returns

Picked points

Definition at line 1422 of file qwt_picker.cpp.

remove()

void QwtPicker::remove ( )

protectedvirtual

Remove the last point of the selection The removed() signal is emitted.

See also

isActive(), begin(), end(), append(), move()

Definition at line 1378 of file qwt_picker.cpp.

removed

void QwtPicker::removed ( const QPoint & pos )

signal

A signal emitted whenever the last appended point of the selection has been removed.

Parameters

pos	Position of the point, that has been removed

See also

remove(), appended()

reset()

void QwtPicker::reset ( )

protectedvirtual

Reset the state machine and terminate ( end(false) ) the selection

Definition at line 1322 of file qwt_picker.cpp.

resizeMode()

QwtPicker::ResizeMode QwtPicker::resizeMode

(

)

const

Returns

Resize mode

See also

setResizeMode(), ResizeMode

Definition at line 362 of file qwt_picker.cpp.

rubberBand()

QwtPicker::RubberBand QwtPicker::rubberBand

(

)

const

Returns

Rubber band style

See also

setRubberBand(), RubberBand, rubberBandPen()

Definition at line 299 of file qwt_picker.cpp.

rubberBandMask()

QRegion QwtPicker::rubberBandMask ( ) const

virtual

Calculate the mask for the rubber band overlay

Returns

Region for the mask

See also

QWidget::setMask()

Definition at line 526 of file qwt_picker.cpp.

rubberBandOverlay()

const QwtWidgetOverlay * QwtPicker::rubberBandOverlay ( ) const

protected

Returns

Overlay displaying the rubber band

Definition at line 1600 of file qwt_picker.cpp.

rubberBandPen()

QPen QwtPicker::rubberBandPen

(

)

const

Returns

Rubber band pen

See also

setRubberBandPen(), rubberBand()

Definition at line 473 of file qwt_picker.cpp.

selected

void QwtPicker::selected ( const QPolygon & polygon )

signal

A signal emitting the selected points, at the end of a selection.

Parameters

polygon

Selected points

selection()

QPolygon QwtPicker::selection

(

)

const

Returns

Selected points

See also

pickedPoints(), adjustedPoints()

Definition at line 792 of file qwt_picker.cpp.

setEnabled

void QwtPicker::setEnabled ( bool enabled )

slot

En/disable the picker.

When enabled is true an event filter is installed for the observed widget, otherwise the event filter is removed.

Parameters

enabled

true or false

See also

isEnabled(), eventFilter()

Definition at line 376 of file qwt_picker.cpp.

setResizeMode()

void QwtPicker::setResizeMode

(

ResizeMode

mode

)

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.

Parameters

mode	Resize mode

See also

resizeMode(), ResizeMode

Definition at line 352 of file qwt_picker.cpp.

setRubberBand()

void QwtPicker::setRubberBand

(

RubberBand

rubberBand

)

Set the rubber band style

Parameters

rubberBand

Rubber band style The default value is NoRubberBand.

See also

rubberBand(), RubberBand, setRubberBandPen()

Definition at line 290 of file qwt_picker.cpp.

setRubberBandPen()

void QwtPicker::setRubberBandPen

(

const QPen &

pen

)

Set the pen for the rubberband

Parameters

pen	Rubber band pen

See also

rubberBandPen(), setRubberBand()

Definition at line 460 of file qwt_picker.cpp.

setStateMachine()

void QwtPicker::setStateMachine

(

QwtPickerMachine *

stateMachine

)

Set a state machine and delete the previous one

Parameters

stateMachine

State machine

See also

stateMachine()

Definition at line 230 of file qwt_picker.cpp.

setTrackerFont()

void QwtPicker::setTrackerFont

(

const QFont &

font

)

Set the font for the tracker

Parameters

font	Tracker font

See also

trackerFont(), setTrackerMode(), setTrackerPen()

Definition at line 411 of file qwt_picker.cpp.

setTrackerMode()

void QwtPicker::setTrackerMode

(

DisplayMode

mode

)

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).

Parameters

mode	Tracker display mode

Warning

In case of AlwaysOn, mouseTracking will be enabled for the observed widget.

See also

trackerMode(), DisplayMode

Definition at line 320 of file qwt_picker.cpp.

setTrackerPen()

void QwtPicker::setTrackerPen

(

const QPen &

pen

)

Set the pen for the tracker

Parameters

pen	Tracker pen

See also

trackerPen(), setTrackerMode(), setTrackerFont()

Definition at line 436 of file qwt_picker.cpp.

stateMachine() [1/2]

QwtPickerMachine * QwtPicker::stateMachine

(

)

Returns

Assigned state machine

See also

setStateMachine()

Definition at line 248 of file qwt_picker.cpp.

stateMachine() [2/2]

const QwtPickerMachine * QwtPicker::stateMachine

(

)

const

Returns

Assigned state machine

See also

setStateMachine()

Definition at line 257 of file qwt_picker.cpp.

stretchSelection()

void QwtPicker::stretchSelection ( const QSize & oldSize, const QSize & newSize )

protectedvirtual

Scale the selection by the ratios of oldSize and newSize The changed() signal is emitted.

Parameters

oldSize	Previous size
newSize	Current size

See also

ResizeMode, setResizeMode(), resizeMode()

Definition at line 1436 of file qwt_picker.cpp.

trackerFont()

QFont QwtPicker::trackerFont

(

)

const

Returns

Tracker font

See also

setTrackerFont(), trackerMode(), trackerPen()

Definition at line 425 of file qwt_picker.cpp.

trackerMask()

QRegion QwtPicker::trackerMask ( ) const

virtual

Calculate the mask for the tracker overlay

Returns

Region with one rectangle: trackerRect( trackerFont() );

See also

QWidget::setMask(), trackerRect()

Definition at line 515 of file qwt_picker.cpp.

trackerMode()

QwtPicker::DisplayMode QwtPicker::trackerMode

(

)

const

Returns

Tracker display mode

See also

setTrackerMode(), DisplayMode

Definition at line 333 of file qwt_picker.cpp.

trackerOverlay()

const QwtWidgetOverlay * QwtPicker::trackerOverlay ( ) const

protected

Returns

Overlay displaying the tracker text

Definition at line 1606 of file qwt_picker.cpp.

trackerPen()

QPen QwtPicker::trackerPen

(

)

const

Returns

Tracker pen

See also

setTrackerPen(), trackerMode(), trackerFont()

Definition at line 449 of file qwt_picker.cpp.

trackerPosition()

QPoint QwtPicker::trackerPosition

(

)

const

Returns

Current position of the tracker

Definition at line 798 of file qwt_picker.cpp.

trackerRect() [1/2]

QRect QwtPicker::trackerRect ( const QFont & font ) const

virtual

Calculate the bounding rectangle for the tracker text from the current position of the tracker

Parameters

font	Font of the tracker text

Returns

Bounding rectangle of the tracker text

See also

trackerPosition()

Definition at line 812 of file qwt_picker.cpp.

trackerRect() [2/2]

QRect QwtPicker::trackerRect ( const QSize & size ) const

protected

Calculate the geometry of the tracker that is needed to display information of a specific size at the tracker position

Parameters

size

Size

Returns

Bounding rectangle of the tracker

See also

trackerPosition()

Definition at line 844 of file qwt_picker.cpp.

trackerText()

QwtText QwtPicker::trackerText ( const QPoint & pos ) const

virtual

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".

Parameters

pos

Position

Returns

Converted position as string

Reimplemented in QwtPlotPicker, and QwtPolarPicker.

Definition at line 491 of file qwt_picker.cpp.

transition()

void QwtPicker::transition ( const QEvent * event )

protectedvirtual

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() ).

Parameters

event

Event

Definition at line 1195 of file qwt_picker.cpp.

updateDisplay()

void QwtPicker::updateDisplay ( )

protectedvirtual

Update the state of rubber band and tracker label.

Definition at line 1505 of file qwt_picker.cpp.

widgetEnterEvent()

void QwtPicker::widgetEnterEvent ( QEvent * event )

protectedvirtual

Handle a enter event for the observed widget.

Parameters

event

Qt event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1037 of file qwt_picker.cpp.

widgetKeyPressEvent()

void QwtPicker::widgetKeyPressEvent ( QKeyEvent * keyEvent )

protectedvirtual

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.

Parameters

keyEvent

Key event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyReleaseEvent(), stateMachine(), QwtEventPattern::KeyPatternCode

Reimplemented in QwtPlotZoomer.

Definition at line 1131 of file qwt_picker.cpp.

widgetKeyReleaseEvent()

void QwtPicker::widgetKeyReleaseEvent ( QKeyEvent * keyEvent )

protectedvirtual

Handle a key release event for the observed widget.

Passes the event to the state machine.

Parameters

keyEvent

Key event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), stateMachine()

Definition at line 1183 of file qwt_picker.cpp.

widgetLeaveEvent()

void QwtPicker::widgetLeaveEvent ( QEvent * event )

protectedvirtual

Handle a leave event for the observed widget.

Parameters

event

Qt event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1051 of file qwt_picker.cpp.

widgetMouseDoubleClickEvent()

void QwtPicker::widgetMouseDoubleClickEvent ( QMouseEvent * mouseEvent )

protectedvirtual

Handle mouse double click event for the observed widget.

Parameters

mouseEvent

Mouse event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1083 of file qwt_picker.cpp.

widgetMouseMoveEvent()

void QwtPicker::widgetMouseMoveEvent ( QMouseEvent * mouseEvent )

protectedvirtual

Handle a mouse move event for the observed widget.

Parameters

mouseEvent

Mouse event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1015 of file qwt_picker.cpp.

widgetMousePressEvent()

void QwtPicker::widgetMousePressEvent ( QMouseEvent * mouseEvent )

protectedvirtual

Handle a mouse press event for the observed widget.

Parameters

mouseEvent

Mouse event

See also

eventFilter(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1001 of file qwt_picker.cpp.

widgetMouseReleaseEvent()

void QwtPicker::widgetMouseReleaseEvent ( QMouseEvent * mouseEvent )

protectedvirtual

Handle a mouse release event for the observed widget.

Parameters

mouseEvent

Mouse event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Reimplemented in QwtPlotZoomer.

Definition at line 1069 of file qwt_picker.cpp.

widgetWheelEvent()

void QwtPicker::widgetWheelEvent ( QWheelEvent * wheelEvent )

protectedvirtual

Handle a wheel event for the observed widget.

Move the last point of the selection in case of isActive() == true

Parameters

wheelEvent

Wheel event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Definition at line 1100 of file qwt_picker.cpp.