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. | |
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.
Definition at line 185 of file qwt_picker_machine.h.
