Qwt User's Guide: QwtPickerMachine Class Reference

Qwt User's Guide 6.1.3

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QwtPickerMachine Class Referenceabstract

A state machine for QwtPicker selections. More...

`#include <qwt_picker_machine.h>`

Inheritance diagram for QwtPickerMachine:
[legend]

## Public Types
enum | SelectionType { NoSelection = -1, PointSelection, RectSelection, PolygonSelection }
enum | Command { Begin, Append, Move, Remove, End }
| Commands - the output of a state machine.

## Public Member Functions
| QwtPickerMachine (SelectionType)
| Constructor.
virtual | ~QwtPickerMachine ()
| Destructor.
virtual QList< Command > | transition (const QwtEventPattern &, const QEvent *)=0
| Transition.
void | reset ()
| Set the current state to 0.
int | state () const
| Return the current state.
void | setState (int)
| Change the current state.
SelectionType | selectionType () const
| Return the selection type.

## 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::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).