# QwtPickerMachine Class Reference

A state machine for QwtPicker selections. More...

`#include <qwt_picker_machine.h>`

Inheritance diagram for QwtPickerMachine:

[legend]

List of all members.

## Public Types
enum | Command { Begin, Append, Move, End }
typedef QList< Command > | CommandList
## Public Member Functions
virtual | ~QwtPickerMachine ()
virtual CommandList | transition (const QwtEventPattern &, const QEvent *)=0
void | reset ()
int | state () const
void | setState (int)
## Protected Member Functions
| 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

## Member Enumeration Documentation

enum QwtPickerMachine::Command

Commands - the output of the state machine.

## Constructor & Destructor Documentation

QwtPickerMachine::~QwtPickerMachine | ( |  | ) | `[virtual]`

Destructor.

QwtPickerMachine::QwtPickerMachine | ( |  | ) | `[protected]`

Constructor.

## Member Function Documentation

void QwtPickerMachine::reset | ( |  | ) |

Set the current state to 0.

void QwtPickerMachine::setState | ( | int | state | ) |

Change the current state.

int QwtPickerMachine::state | ( |  | ) | const

Return the current state.

virtual CommandList QwtPickerMachine::transition | ( | const QwtEventPattern & | ,
|  | const QEvent * |  |
| ) |  |  | `[pure virtual]`

Transition.

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