QwtPickerDragLineMachine Class Reference

A state machine for line selections. More...

#include <qwt_picker_machine.h>

Inheritance diagram for QwtPickerDragLineMachine:

Public Member Functions
	QwtPickerDragLineMachine ()
	Constructor.
virtual QList< Command >	transition (const QwtEventPattern &, const QEvent *) override
	Transition.
Public Member Functions inherited from QwtPickerMachine
	QwtPickerMachine (SelectionType)
	Constructor.
virtual	~QwtPickerMachine ()
	Destructor.
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.

Additional Inherited Members
Public Types inherited from QwtPickerMachine
enum	SelectionType { NoSelection = -1 , PointSelection , RectSelection , PolygonSelection }
enum	Command {   Begin , Append , Move , Remove ,   End }
	Commands - the output of a state machine. More...

Detailed Description

A state machine for line selections.

Pressing QwtEventPattern::MouseSelect1 selects the first point, releasing it the second point. Pressing QwtEventPattern::KeySelect1 also selects the first point, a second press selects the second point and terminates the selection.

A common use case of QwtPickerDragLineMachine are pickers for distance measurements.

See also

QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode

Definition at line 185 of file qwt_picker_machine.h.

Constructor & Destructor Documentation

QwtPickerDragLineMachine()

QwtPickerDragLineMachine::QwtPickerDragLineMachine

(

)

Constructor.

Definition at line 473 of file qwt_picker_machine.cpp.

Member Function Documentation

transition()

QList< QwtPickerMachine::Command > QwtPickerDragLineMachine::transition ( const QwtEventPattern & eventPattern, const QEvent * event )

overridevirtual

Transition.

Implements QwtPickerMachine.

Definition at line 479 of file qwt_picker_machine.cpp.