| Qwt User's Guide 6.3.0
    | 
A state machine for line selections. More...
#include <qwt_picker_machine.h>
| 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... | |
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.
Definition at line 185 of file qwt_picker_machine.h.
| QwtPickerDragLineMachine::QwtPickerDragLineMachine | ( | ) | 
Constructor.
Definition at line 473 of file qwt_picker_machine.cpp.
| 
 | overridevirtual |