QwtPickerDragLineMachine man page
QwtPickerDragLineMachine — A state machine for line selections.
Public Member Functions
virtual QList< Command > transition (const QwtEventPattern &, const QEvent *)
Additional Inherited Members
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.
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