QwtPickerMachine Class Reference

#include <qwt_picker_machine.h>

Inherited by QwtPickerClickPointMachine, QwtPickerClickRectMachine, QwtPickerDragPointMachine, QwtPickerDragRectMachine, QwtPickerPolygonMachine, and QwtPickerTrackerMachine.

List of all members.

Public Types
enum	Command {   Begin,   Append,   Move,   Remove,   End }
enum	SelectionType {   NoSelection = -1,   PointSelection,   RectSelection,   PolygonSelection }
Public Member Functions
	QwtPickerMachine (SelectionType)
void	reset ()
SelectionType	selectionType () const
void	setState (int)
int	state () const
virtual QList< Command >	transition (const QwtEventPattern &, const QEvent *)=0
virtual	~QwtPickerMachine ()

---

Detailed Description

A state machine for QwtPicker selections.

QwtPickerMachine accepts key and mouse events and translates them into selection commands.

See also:

QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode

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Member Enumeration Documentation

enum QwtPickerMachine::Command

Commands - the output of a state machine.

enum QwtPickerMachine::SelectionType

Type of a selection.

See also:

selectionType()

Enumerator:

NoSelection	The state machine not usable for any type of selection.
PointSelection	The state machine is for selecting a single point.
RectSelection	The state machine is for selecting a rectangle (2 points).
PolygonSelection	The state machine is for selecting a polygon (many points).

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Constructor & Destructor Documentation

QwtPickerMachine::QwtPickerMachine

(

SelectionType

type

)

Constructor.

QwtPickerMachine::~QwtPickerMachine

(

)

[virtual]

Destructor.

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Member Function Documentation

void QwtPickerMachine::reset

(

)

Set the current state to 0.

QwtPickerMachine::SelectionType QwtPickerMachine::selectionType

(

)

const

Return the selection type.

void QwtPickerMachine::setState

(

int

state

)

Change the current state.

int QwtPickerMachine::state

(

)

const

Return the current state.

virtual QList<Command> QwtPickerMachine::transition	(	const QwtEventPattern &	,
		const QEvent *
	)		[pure virtual]

Transition.

Implemented in QwtPickerPolygonMachine, QwtPickerDragRectMachine, QwtPickerClickRectMachine, QwtPickerDragPointMachine, QwtPickerClickPointMachine, and QwtPickerTrackerMachine.