QwtPicker provides selections on a widget 更多...

#include <qwt_picker.h>

类 QwtPicker 继承关系图:

类
class	PrivateData

Public 类型
enum	RubberBand { NoRubberBand = 0 , HLineRubberBand , VLineRubberBand , CrossRubberBand , RectRubberBand , EllipseRubberBand , PolygonRubberBand , UserRubberBand = 100 }
	Rubber band style 更多...

enum	DisplayMode { AlwaysOff , AlwaysOn , ActiveOnly }
	Display mode 更多...

enum	ResizeMode { Stretch , KeepSize }
	Controls what to do with the selected points when the observed widget is resized 更多...

Public 类型继承自 QwtEventPattern
enum	MousePatternCode { MouseSelect1 , MouseSelect2 , MouseSelect3 , MouseSelect4 , MouseSelect5 , MouseSelect6 , MousePatternCount }
	Symbolic mouse input codes 更多...

enum	KeyPatternCode { KeySelect1 , KeySelect2 , KeyAbort , KeyLeft , KeyRight , KeyUp , KeyDown , KeyRedo , KeyUndo , KeyHome , KeyPatternCount }
	Symbolic keyboard input codes 更多...

Public 槽
void	setEnabled (bool)
	Enable or disable the picker

信号
void	activated (bool on)
	Signal indicating when the picker has been activated

void	selected (const QPolygon &polygon)
	Signal emitting the selected points at the end of a selection

void	appended (const QPoint &pos)
	Signal emitted when a point has been appended to the selection

void	moved (const QPoint &pos)
	Signal emitted whenever the last appended point of the selection has been moved

void	removed (const QPoint &pos)
	Signal emitted whenever the last appended point of the selection has been removed

void	changed (const QPolygon &selection)
	Signal emitted when the active selection has been changed

Public 成员函数
	QwtPicker (QWidget *parent)
	Constructor

	QwtPicker (RubberBand rubberBand, DisplayMode trackerMode, QWidget *)

void	setStateMachine (QwtPickerMachine *)
	Set a state machine and delete the previous one

const QwtPickerMachine *	stateMachine () const
	Return the assigned state machine (const)

QwtPickerMachine *	stateMachine ()
	Return the assigned state machine

void	setRubberBand (RubberBand)
	Set the rubber band style

RubberBand	rubberBand () const
	Return the rubber band style

void	setTrackerMode (DisplayMode)
	Set the display mode of the tracker

DisplayMode	trackerMode () const
	Return the tracker display mode

void	setResizeMode (ResizeMode)
	Set the resize mode

ResizeMode	resizeMode () const
	Return the resize mode

void	setRubberBandPen (const QPen &)
	Set the pen for the rubber band

QPen	rubberBandPen () const
	Return the rubber band pen

void	setTrackerPen (const QPen &)
	Set the pen for the tracker

QPen	trackerPen () const
	Return the tracker pen

void	setTrackerFont (const QFont &)
	Set the font for the tracker

QFont	trackerFont () const
	Return the tracker font

bool	isEnabled () const
	Return true when enabled, false otherwise

bool	isActive () const
	A picker is active between begin() and end()

virtual bool	eventFilter (QObject , QEvent ) override
	Event filter for handling events

QWidget *	parentWidget ()
	Return the parent widget, where the selection happens

const QWidget *	parentWidget () const
	Return the parent widget, where the selection happens (const)

virtual QPainterPath	pickArea () const
	Find the area of the observed widget, where selection might happen

virtual void	drawRubberBand (QPainter *) const
	Draw a rubber band, depending on rubberBand()

virtual void	drawTracker (QPainter *) const
	Draw the tracker

virtual QRegion	trackerMask () const
	Calculate the mask for the tracker overlay

virtual QRegion	rubberBandMask () const
	Calculate the mask for the rubber band overlay

virtual QwtText	trackerText (const QPoint &pos) const
	Return the label for a position

virtual QRect	trackerRect (const QFont &) const
	Calculate the bounding rectangle for the tracker text from the current position of the tracker

virtual void	setTrackerPosition (const QPoint &pos)
	Set the tracker position manually

QPoint	trackerPosition () const
	Return the current position of the tracker

QPolygon	selection () const
	Return the selected points

void	update ()

void	setActive (bool on)

Public 成员函数继承自 QwtEventPattern
	QwtEventPattern ()
	Constructor

virtual	~QwtEventPattern ()
	Destructor

void	initMousePattern (int numButtons)
	Set default mouse patterns depending on the number of mouse buttons

void	initKeyPattern ()
	Set default key patterns

void	setMousePattern (MousePatternCode, Qt::MouseButton button, Qt::KeyboardModifiers=Qt::NoModifier)
	Change one mouse pattern

void	setKeyPattern (KeyPatternCode, int key, Qt::KeyboardModifiers modifiers=Qt::NoModifier)
	Change one key pattern

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
	Return the mouse pattern vector

const QVector< KeyPattern > &	keyPattern () const
	Return the key pattern vector

QVector< MousePattern > &	mousePattern ()
	Return the mouse pattern vector

QVector< KeyPattern > &	keyPattern ()
	Return the key pattern vector

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 成员函数
virtual QPolygon	adjustedPoints (const QPolygon &) const
	Map the pickedPoints() into a selection()

virtual void	transition (const QEvent *)
	Passes an event to the state machine and executes the resulting commands.

virtual void	begin ()
	Open a selection setting the state to active

virtual void	append (const QPoint &)
	Append a point to the selection and update rubber band and tracker.

virtual void	move (const QPoint &)
	Move the last point of the selection The moved() signal is emitted.

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

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

virtual void	widgetMousePressEvent (QMouseEvent *)
	Handle a mouse press event for the observed widget.

virtual void	widgetMouseReleaseEvent (QMouseEvent *)
	Handle a mouse release event for the observed widget.

virtual void	widgetMouseDoubleClickEvent (QMouseEvent *)
	Handle mouse double click event for the observed widget.

virtual void	widgetMouseMoveEvent (QMouseEvent *)
	Handle a mouse move event for the observed widget.

virtual void	widgetWheelEvent (QWheelEvent *)
	Handle a wheel event for the observed widget.

virtual void	widgetKeyPressEvent (QKeyEvent *)
	Handle a key press event for the observed widget.

virtual void	widgetKeyReleaseEvent (QKeyEvent *)
	Handle a key release event for the observed widget.

virtual void	widgetEnterEvent (QEvent *)
	Handle a enter event for the observed widget.

virtual void	widgetLeaveEvent (QEvent *)
	Handle a leave event for the observed widget.

virtual void	stretchSelection (const QSize &oldSize, const QSize &newSize)
	Scale the selection by the ratios of oldSize and newSize The changed() signal is emitted.

virtual void	updateDisplay ()
	Update the state of rubber band and tracker label

const QwtWidgetOverlay *	rubberBandOverlay () const
	Return the overlay displaying the rubber band

const QwtWidgetOverlay *	trackerOverlay () const
	Return the overlay displaying the tracker text

const QPolygon &	pickedPoints () const
	Return the points that have been collected so far

Protected 成员函数继承自 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.

属性
bool	isEnabled

ResizeMode	resizeMode

DisplayMode	trackerMode

QPen	trackerPen

QFont	trackerFont

RubberBand	rubberBand

QPen	rubberBandPen

详细描述

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.

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)

警告: 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 AlwaysOn.

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);

QwtPickerDragRectMachine
A state machine for rectangle selections
Definition qwt_picker_machine.h:178

QwtPicker
QwtPicker provides selections on a widget
Definition qwt_picker.h:108

QwtPicker::ActiveOnly
@ ActiveOnly
Display only when the selection is active
Definition qwt_picker.h:171

QwtPicker::setStateMachine
void setStateMachine(QwtPickerMachine *)
Set a state machine and delete the previous one
Definition qwt_picker.cpp:249

QwtPicker::setRubberBand
void setRubberBand(RubberBand)
Set the rubber band style
Definition qwt_picker.cpp:312

QwtPicker::setTrackerMode
void setTrackerMode(DisplayMode)
Set the display mode of the tracker
Definition qwt_picker.cpp:338

QwtPicker::RectRubberBand
@ RectRubberBand
A rectangle ( only for QwtPickerMachine::RectSelection )
Definition qwt_picker.h:144

成员枚举类型说明

◆ DisplayMode

enum QwtPicker::DisplayMode

Display mode

参见: setTrackerMode(), trackerMode(), isActive()

枚举值
AlwaysOff	Display never
AlwaysOn	Display always
ActiveOnly	Display only when the selection is active

◆ ResizeMode

enum QwtPicker::ResizeMode

Controls what to do with the selected points when the observed widget is resized

The default value is QwtPicker::Stretch.

参见: setResizeMode()

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

◆ RubberBand

enum QwtPicker::RubberBand

Rubber band style

The default value is QwtPicker::NoRubberBand.

参见: setRubberBand(), rubberBand()

枚举值
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

构造及析构函数说明

◆ QwtPicker()

QwtPicker::QwtPicker ( QWidget * parent )

explicit

Constructor

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

参数

parent Parent widget, that will be observed

Constructor

参数

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

Destructor

成员函数说明

◆ accept()

bool QwtPicker::accept ( QPolygon & selection ) const

protectedvirtual

Validate and fix up the selection

Accepts all selections unmodified

参数

selection Selection to validate and fix up

返回: true, when accepted, false otherwise

被 QwtPlotAxisZoomer , 以及 QwtPlotCanvasZoomer 重载.

◆ activated

void QwtPicker::activated ( bool on )

signal

Signal indicating when the picker has been activated

Together with setEnabled() it can be used to implement selections with more than one picker.

参数

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.
参数

points Selected points

返回
Selected points unmodified

◆ 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.

参数

pos	Additional point

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

被 QwtPlotPicker , 以及 QwtPolarPicker 重载.

◆ appended

void QwtPicker::appended ( const QPoint & pos )

signal

Signal emitted when a point has been appended to the selection

参数

pos	Position of the appended point

参见: append(), moved()

◆ begin()

void QwtPicker::begin ( )

protectedvirtual

Open a selection setting the state to active

参见: isActive(), end(), append(), move()

被 QwtPlotAxisZoomer , 以及 QwtPlotCanvasZoomer 重载.

◆ changed

void QwtPicker::changed ( const QPolygon & selection )

signal

Signal emitted when the active selection has been changed

This might happen when the observed widget is resized.

参数

selection Changed selection

参见: stretchSelection()

◆ drawRubberBand()

void QwtPicker::drawRubberBand ( QPainter * painter ) const

virtual

Draw a rubber band, depending on rubberBand()

参数

painter Painter, initialized with a clip region

参见: rubberBand(), RubberBand

被 QwtPlotSeriesDataPicker 重载.

◆ drawTracker()

void QwtPicker::drawTracker ( QPainter * painter ) const

virtual

Draw the tracker

参数

painter Painter

参见: trackerRect(), trackerText()

◆ 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().

参数

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

返回: true if the selection is accepted, false otherwise

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

被 QwtPlotAxisZoomer, QwtPlotCanvasZoomer, QwtPlotPanner, QwtPlotPicker , 以及 QwtPolarPicker 重载.

◆ eventFilter()

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

overridevirtual

Event filter for handling events

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.

参数

object	Object to be filtered
event	Event

返回: Always false

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

◆ isActive()

bool QwtPicker::isActive ( ) const

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

返回: True if the selection is active

◆ isEnabled()

bool QwtPicker::isEnabled ( ) const

Return true when enabled, false otherwise

返回: True when enabled

参见: setEnabled(), eventFilter()

◆ move()

void QwtPicker::move ( const QPoint & pos )

protectedvirtual

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

参数

pos	New position

参见: isActive(), begin(), end(), append()

被 QwtPlotPanner, QwtPlotPicker, QwtPolarPicker , 以及 QwtPlotSeriesDataPicker 重载.

◆ moved

void QwtPicker::moved ( const QPoint & pos )

signal

Signal emitted whenever the last appended point of the selection has been moved

参数

pos	Position of the moved last point of the selection

参见: move(), appended()

◆ parentWidget() [1/2]

QWidget * QwtPicker::parentWidget ( )

Return the parent widget, where the selection happens

返回: Parent widget

◆ parentWidget() [2/2]

const QWidget * QwtPicker::parentWidget ( ) const

Return the parent widget, where the selection happens (const)

返回: Parent widget

◆ pickArea()

QPainterPath QwtPicker::pickArea ( ) const

virtual

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

返回: parentWidget()->contentsRect()

◆ 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().

返回: Picked points

◆ remove()

void QwtPicker::remove ( )

protectedvirtual

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

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

◆ removed

void QwtPicker::removed ( const QPoint & pos )

signal

Signal emitted whenever the last appended point of the selection has been removed

参数

pos	Position of the point that has been removed

参见: remove(), appended()

◆ resizeMode()

QwtPicker::ResizeMode QwtPicker::resizeMode ( ) const

Return the resize mode

返回: Resize mode

参见: setResizeMode(), ResizeMode

◆ rubberBand()

QwtPicker::RubberBand QwtPicker::rubberBand ( ) const

Return the rubber band style

返回: Rubber band style

参见: setRubberBand(), RubberBand, rubberBandPen()

◆ rubberBandMask()

QRegion QwtPicker::rubberBandMask ( ) const

virtual

Calculate the mask for the rubber band overlay

返回: Region for the mask

参见: QWidget::setMask()

◆ rubberBandOverlay()

const QwtWidgetOverlay * QwtPicker::rubberBandOverlay ( ) const

protected

Return the overlay displaying the rubber band

返回: Overlay displaying the rubber band

◆ rubberBandPen()

QPen QwtPicker::rubberBandPen ( ) const

Return the rubber band pen

返回: Rubber band pen

参见: setRubberBandPen(), rubberBand()

◆ selected

void QwtPicker::selected ( const QPolygon & polygon )

signal

Signal emitting the selected points at the end of a selection

参数

polygon Selected points

◆ selection()

QPolygon QwtPicker::selection ( ) const

Return the selected points

返回: Selected points

参见: pickedPoints(), adjustedPoints()

◆ setEnabled

void QwtPicker::setEnabled ( bool enabled )

slot

Enable or disable the picker

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

参数

enabled true or false

参见: isEnabled(), eventFilter()

◆ 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.

参数

mode	Resize mode

参见: resizeMode(), ResizeMode

◆ setRubberBand()

void QwtPicker::setRubberBand ( RubberBand rubberBand )

Set the rubber band style

The default value is NoRubberBand.

参数

rubberBand Rubber band style

参见: rubberBand(), RubberBand, setRubberBandPen()

◆ setRubberBandPen()

void QwtPicker::setRubberBandPen ( const QPen & pen )

Set the pen for the rubber band

参数

pen	Rubber band pen

参见: rubberBandPen(), setRubberBand()

◆ setStateMachine()

void QwtPicker::setStateMachine ( QwtPickerMachine * stateMachine )

Set a state machine and delete the previous one

参数

stateMachine State machine

参见: stateMachine()

◆ setTrackerFont()

void QwtPicker::setTrackerFont ( const QFont & font )

Set the font for the tracker

参数

font	Tracker font

参见: trackerFont(), setTrackerMode(), setTrackerPen()

◆ 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).

参数

mode	Tracker display mode

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

参见: trackerMode(), DisplayMode

◆ setTrackerPen()

void QwtPicker::setTrackerPen ( const QPen & pen )

Set the pen for the tracker

参数

pen	Tracker pen

参见: trackerPen(), setTrackerMode(), setTrackerFont()

◆ setTrackerPosition()

void QwtPicker::setTrackerPosition ( const QPoint & pos )

virtual

Set the tracker position manually

Normally this does not need to be called, but sometimes you may want to display the picker without a mouse.

参数

pos	Position to set

被 QwtPlotSeriesDataPicker 重载.

◆ stateMachine() [1/2]

QwtPickerMachine * QwtPicker::stateMachine ( )

Return the assigned state machine

返回: Assigned state machine

参见: setStateMachine()

◆ stateMachine() [2/2]

const QwtPickerMachine * QwtPicker::stateMachine ( ) const

Return the assigned state machine (const)

返回: Assigned state machine

参见: setStateMachine()

◆ 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.

参数

oldSize	Previous size
newSize	Current size

参见: ResizeMode, setResizeMode(), resizeMode()

◆ trackerFont()

QFont QwtPicker::trackerFont ( ) const

Return the tracker font

返回: Tracker font

参见: setTrackerFont(), trackerMode(), trackerPen()

◆ trackerMask()

QRegion QwtPicker::trackerMask ( ) const

virtual

Calculate the mask for the tracker overlay

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

参见: QWidget::setMask(), trackerRect()

◆ trackerMode()

QwtPicker::DisplayMode QwtPicker::trackerMode ( ) const

Return the tracker display mode

返回: Tracker display mode

参见: setTrackerMode(), DisplayMode

◆ trackerOverlay()

const QwtWidgetOverlay * QwtPicker::trackerOverlay ( ) const

protected

Return the overlay displaying the tracker text

返回: Overlay displaying the tracker text

◆ trackerPen()

QPen QwtPicker::trackerPen ( ) const

Return the tracker pen

返回: Tracker pen

参见: setTrackerPen(), trackerMode(), trackerFont()

◆ trackerPosition()

QPoint QwtPicker::trackerPosition ( ) const

Return the current position of the tracker

返回: Current position of the tracker

◆ trackerRect()

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

virtual

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

参数

font	Font of the tracker text

返回: Bounding rectangle of the tracker text

参见: trackerPosition()

被 QwtPlotSeriesDataPicker 重载.

◆ 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".

参数

pos Position

返回: Converted position as string

被 QwtPlotPicker, QwtPolarPicker , 以及 QwtPlotSeriesDataPicker 重载.

◆ 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() ).

参数

event Event

◆ widgetEnterEvent()

void QwtPicker::widgetEnterEvent ( QEvent * event )

protectedvirtual

Handle a enter event for the observed widget.

参数

event Qt event

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

◆ 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.

参数

keyEvent Key event

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

被 QwtPlotAxisZoomer , 以及 QwtPlotCanvasZoomer 重载.

◆ widgetKeyReleaseEvent()

void QwtPicker::widgetKeyReleaseEvent ( QKeyEvent * keyEvent )

protectedvirtual

Handle a key release event for the observed widget.

Passes the event to the state machine.

参数

keyEvent Key event

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

◆ widgetLeaveEvent()

void QwtPicker::widgetLeaveEvent ( QEvent * event )

protectedvirtual

Handle a leave event for the observed widget.

参数

event Qt event

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

◆ widgetMouseDoubleClickEvent()

void QwtPicker::widgetMouseDoubleClickEvent ( QMouseEvent * mouseEvent )

protectedvirtual

Handle mouse double click event for the observed widget.

参数

mouseEvent Mouse event

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

被 QwtPlotSeriesDataPicker 重载.

◆ widgetMouseMoveEvent()

void QwtPicker::widgetMouseMoveEvent ( QMouseEvent * mouseEvent )

protectedvirtual

Handle a mouse move event for the observed widget.

参数

mouseEvent Mouse event

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

◆ widgetMousePressEvent()

void QwtPicker::widgetMousePressEvent ( QMouseEvent * mouseEvent )

protectedvirtual

Handle a mouse press event for the observed widget.

参数

mouseEvent Mouse event

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

被 QwtPlotSeriesDataPicker , 以及 QwtPlotPanner 重载.

◆ widgetMouseReleaseEvent()

void QwtPicker::widgetMouseReleaseEvent ( QMouseEvent * mouseEvent )

protectedvirtual

Handle a mouse release event for the observed widget.

参数

mouseEvent Mouse event

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

被 QwtPlotAxisZoomer , 以及 QwtPlotCanvasZoomer 重载.

◆ 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

参数

wheelEvent Wheel event

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

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_picker.h
/home/runner/work/QWT/QWT/src/plot/qwt_picker.cpp

类

Public 类型

Public 槽

信号

Public 成员函数

Protected 成员函数

属性

详细描述

成员枚举类型说明

◆ DisplayMode

◆ ResizeMode

◆ RubberBand

构造及析构函数说明

◆ QwtPicker()

成员函数说明

◆ accept()

◆ activated

◆ adjustedPoints()

◆ append()

◆ appended

◆ begin()

◆ changed

◆ drawRubberBand()

◆ drawTracker()

◆ end()

◆ eventFilter()

◆ isActive()

◆ isEnabled()

◆ move()

◆ moved

◆ parentWidget() [1/2]

◆ parentWidget() [2/2]

◆ pickArea()

◆ pickedPoints()

◆ remove()

◆ removed

◆ resizeMode()

◆ rubberBand()

◆ rubberBandMask()

◆ rubberBandOverlay()

◆ rubberBandPen()

◆ selected

◆ selection()

◆ setEnabled

◆ setResizeMode()

◆ setRubberBand()

◆ setRubberBandPen()

◆ setStateMachine()

◆ setTrackerFont()

◆ setTrackerMode()

◆ setTrackerPen()

◆ setTrackerPosition()

◆ stateMachine() [1/2]

◆ stateMachine() [2/2]

◆ stretchSelection()

◆ trackerFont()

◆ trackerMask()

◆ trackerMode()

◆ trackerOverlay()

◆ trackerPen()

◆ trackerPosition()

◆ trackerRect()

◆ trackerText()

◆ transition()

◆ widgetEnterEvent()

◆ widgetKeyPressEvent()

◆ widgetKeyReleaseEvent()

◆ widgetLeaveEvent()

◆ widgetMouseDoubleClickEvent()

◆ widgetMouseMoveEvent()

◆ widgetMousePressEvent()

◆ widgetMouseReleaseEvent()

◆ widgetWheelEvent()