Qwt User's Guide  6.1.1
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QwtPickerMachine Class Referenceabstract

A state machine for QwtPicker selections. More...

#include <qwt_picker_machine.h>

Inheritance diagram for QwtPickerMachine:
Inheritance graph
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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< Commandtransition (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

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).