NAME¶

QwtPickerMachine - A state machine for QwtPicker selections.

SYNOPSIS¶

#include <qwt_picker_machine.h> Inherited by QwtPickerClickPointMachine, QwtPickerClickRectMachine, QwtPickerDragPointMachine, QwtPickerDragRectMachine, QwtPickerPolygonMachine, and QwtPickerTrackerMachine.

Public Types¶

enum SelectionType { NoSelection = -1, PointSelection, RectSelection, PolygonSelection } enum Command { Begin, Append, Move, Remove, End }

Public Member Functions¶

QwtPickerMachine (SelectionType) virtual ~QwtPickerMachine () virtual QList< Command > transition (const QwtEventPattern &, const QEvent *)=0 void reset () int state () const void setState (int) SelectionType selectionType () const

Detailed Description¶

A state machine for QwtPicker selections. QwtPickerMachine accepts key and mouse events and translates them into selection commands. See also:

Member Enumeration Documentation¶

enum QwtPickerMachine::Command¶

Commands - the output of a state machine.

enum QwtPickerMachine::SelectionType Type of a selection.¶

See also: 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).

Constructor & Destructor Documentation¶

QwtPickerMachine::QwtPickerMachine (SelectionTypetype)¶

Constructor.

QwtPickerMachine::~QwtPickerMachine () [virtual]¶

Destructor.

Member Function Documentation¶

void QwtPickerMachine::reset ()¶

Set the current state to 0.

QwtPickerMachine::SelectionType QwtPickerMachine::selectionType () const¶

Return the selection type.

void QwtPickerMachine::setState (intstate)¶

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

Author¶

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