QwtPickerMachine(3)

NAME
QwtPickerMachine - A state machine for QwtPicker selections.

SYNOPSIS

#include <qwt_picker_machine.h>

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

  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).

Author

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